Frick RWB II 496 Owner's manual

Installation - Operation - Maintenance
ROTARY SCREW COMPRESSOR UNITS
ALL REFRIGERANTS
MODELS
496 through 1080
THIS MANUAL CONTAINS RIGGING, ASSEMBLY, START-UP, AND
MAINTENANCE INSTRUCTIONS. READ THOROUGHLY BEFORE
BEGINNING INSTALLATION. FAILURE TO FOLLOW THESE
INSTRUCTIONS COULD RESULT IN DAMAGE OR IMPROPER
OPERATION OF THE UNIT.
S70-210 IOM/OCT 2004
File: SERVICE MANUAL - Section 70
Replaces: S70-200 IOM/DEC 99
Dist: 3, 3a, 3b, 3c

RWB II ROTARY SCREW COMPRESSOR UNITS
INSTALLATION - OPERATION - MAINTENANCE
S70-210 IOM
Page 2
Contents
PREFACE .......................................................................... 3
DESIGN LIMITATIONS ...................................................... 3
JOB INSPECTION ............................................................. 3
TRANSIT DAMAGE CLAIMS ............................................ 3
COMPRESSOR and UNIT IDENTIFICATION ................... 3
Installation
FOUNDATION ................................................................... 4
RIGGING and HANDLING ................................................ 4
SKID REMOVAL ................................................................ 4
MOTOR MOUNTING ......................................................... 5
CHECKING MOTOR/COMPRESSOR ROTATION ............... 5
COMPRESSOR/MOTOR COUPLINGS INSTALLATION ... 5
COUPLING ALIGNMENT PROCEDURE .......................... 7
HOT ALIGNMENT OF COMPRESSOR/MOTOR ................ 9
OIL PUMP COUPLING ...................................................... 9
HOLDING CHARGE AND STORAGE ............................... 9
COMPRESSOR OIL .......................................................... 9
INITIAL OIL CHARGE ....................................................... 9
OIL HEATER(S) ............................................................... 10
OIL FILTER(S) ................................................................. 10
LIQUID INJECTION OIL COOLING ................................ 10
LIQUID LINE SIZES/RECEIVER VOLUME ..................... 10
WATER-COOLED OIL COOLING (OPTIONAL) ................ 11
THERMOSYPHON OIL COOLING (OPTIONAL) ............. 11
ECONOMIZER - HIGH STAGE (OPTIONAL) .................. 13
ELECTRICAL .................................................................. 14
MOTOR STARTER PACKAGE ........................................ 14
CURRENT TRANSFORMER (CT) RATIOS .................... 15
MINIMUM BURDEN RATINGS ........................................ 15
BATTERY BACKUP ......................................................... 15
Operation
OPERATION and START-UP INSTRUCTIONS ............... 16
TDSH COMPRESSOR .................................................... 16
COMPRESSOR LUBRICATION SYSTEM ...................... 16
PRELUBE OIL SYSTEM ................................................. 16
CYCLING FULL-LUBE OIL SYSTEM .............................. 17
FULL-LUBE OIL SYSTEM ............................................... 17
COMPRESSOR OIL SEPARATION SYSTEM ................. 17
COMPRESSOR HYDRAULIC SYSTEM ......................... 18
VOLUMIZER® VOLUME RATIO CONTROL ................... 18
COMPRESSOR OIL COOLING SYSTEMS .................... 19
SINGLE-PORT LIQUID INJECTION ............................... 19
RWB II BOOSTER OR SWING DUTY APPLICATION .... 19
DUAL-PORT LIQUID INJECTION ................................... 19
LIQUID INJECTION ADJUSTMENT PROCEDURE ....... 20
SUCTION CHECK VALVE ............................................... 21
SUCTION CHECK VALVE BYPASS ................................ 21
LOW AMBIENT OPERATION .......................................... 21
POWER ASSIST KIT ....................................................... 21
INITIAL START-UP .......................................................... 22
INITIAL START-UP PROCEDURE .................................. 22
NORMAL START-UP PROCEDURE ............................... 22
Maintenance
GENERAL INFORMATION .............................................. 23
NORMAL MAINTENANCE OPERATIONS ...................... 23
GENERAL MAINTENANCE ............................................ 23
COMPRESSOR SHUTDOWN and START-UP ................ 23
GENERAL INSTRUCTIONS FOR REPLACING
COMPRESSOR UNIT COMPONENTS. .................. 24
OIL FILTER (OF-1) MAIN SINGLE/DUAL ....................... 24
OIL FILTER/STRAINER - PRELUBE OIL PUMP ............... 24
STRAINER - FULL LUBE OIL PUMP .............................. 25
STRAINER - LIQUID INJECTION ................................... 25
COALESCER FILTER ELEMENT(S) ............................... 25
CHANGING OIL .............................................................. 25
RECOMMENDED MAINTENANCE PROGRAM ............... 26
VIBRATION ANALYSIS ................................................... 26
OIL QUALITY and ANALYSIS ......................................... 26
MAINTENANCE SCHEDULE .......................................... 26
OPERATING LOG ........................................................... 27
MOTOR BEARINGS ........................................................ 27
NLGI Grease Compatibility Chart .................................... 27
TROUBLESHOOTING GUIDE ........................................ 28
ABNORMAL OPERATION
ANALYSIS and CORRECTION ................................ 28
PRESSURE TRANSDUCERS - TESTING ...................... 29
PRESSURE TRANSDUCERS - REPLACEMENT ......... 29
SV POSITION POTENTIOMETER
REPLACEMENT AND ADJUSTMENT ..................... 31
VOLUMIZER® POTENTIOMETER REPLACEMENT ...... 31
TEMPERATURE and/or PRESSURE ADJUSTMENT ..... 31
TROUBLESHOOTING THE RWB II COMPRESSOR ..... 32
OIL SEPARATION SYSTEM .................................... 32
HYDRAULIC SYSTEM ............................................. 33
PRELUBE PUMP SYSTEM ..................................... 34
FULL TIME PUMP SYSTEM .................................... 34
LIQUID INJECTION OIL COOLING SYSTEM ......... 35
THERMAL EXPANSION VALVES .................................... 36
JORDAN TEMPERATURE REGULATOR VALVE ............ 37
BARE COMPRESSOR MOUNTING ............................... 38
BALANCE PISTON PRESSURE REGULATOR .............. 38
PROPER INSTALLATION OF ELECTRONIC EQUIPMENT
IN AN INDUSTRIAL ENVIRONMENT ...................... 43
FORMS ............................................................................ 46
RECOMMENDED SPARE PARTS .................................. 51
Indicates an imminently hazardous situation which, if not avoided, will result in death or serious
injury.
Indicates a potentially hazardous situation or practice which, if not avoided, will result in death
or serious injury.
SAFETY PRECAUTION DEFINITIONS
Indicates a potentially hazardous situation or practice which, if not avoided, will result in dam-
age to equipment and/or minor injury.
NOTE: Indicates an operating procedure, practice, etc., or portion thereof which is essential to highlight.

RWB II ROTARY SCREW COMPRESSOR UNITS
GENERAL INFORMATION
S70-210 IOM
Page 3
PREFACE
This manual has been prepared to acquaint the owner and
serviceman with the INSTALLATION, OPERATION, and
MAINTENANCE procedures as recommended by Frick for
RWB II Rotary Screw Compressor Units.
For information about the functions of the electrical control
panel, communications, specifications, and wiring diagrams,
see S90-010 M (Quantum panel) or S70-200 OM (Plus
panel).
It is most important that these units be properly applied to
an adequately controlled refrigeration system. Your authori-
zed Frick representative should be consulted for his expert
guidance in this determination.
Proper performance and continued satisfaction with these
units is dependent upon:
CORRECT INSTALLATION
PROPER OPERATION
REGULAR, SYSTEMATIC MAINTENANCE
To ensure correct installation and application, the equipment
must be properly selected and connected to a properly de-
signed and installed system. The Engineering plans, piping
layouts, etc. must be detailed in accordance with the best
practices and local codes, such as those outlined in ASHRAE
literature.
A refrigeration compressor is a VAPOR PUMP. To be certain
that it is not being subjected to liquid refrigerant carryover it
is necessary that refrigerant controls are carefully selected
and in good operating condition; the piping is properly sized
and traps, if necessary, are correctly arranged; the suction
line has an accumulator or slugging protection; that load
surges are known and provisions made for control; operating
cycles and defrosting periods are reasonable; and that high
side condensers are sized within system and compressor
design limits.
It is recommended that the entering vapor temperature to the
compressor be superheated to 10°F above the refrigerant
saturation temperature. This assures that all refrigerant at
the compressor suction is in the vapor state.
DESIGN LIMITATIONS
The compressor units are designed for operation within
the pressure and temperature limits as shown in Frick Pub.
E70-200 SED.
JOB INSPECTION
Immediately upon arrival examine all crates, boxes and
exposed compressor and component surfaces for damage.
Unpack all items and check against shipping lists for any
possible shortage. Examine all items for damage in transit.
TRANSIT DAMAGE CLAIMS
All claims must be made by consignee. This is an ICC re-
quirement. Request immediate inspection by the agent of the
carrier and be sure the proper claim forms are executed.
Report damage or shortage claims immediately to Frick,
Sales Administration Department, in Waynesboro, PA.
COMPRESSOR and UNIT IDENTIFICATION
Each compressor unit has 2 identification data plates. The
compressor data plate containing compressor model and
serial number is mounted on the compressor body. The unit
data plate containing unit model, serial number and Frick
sales order number is mounted on the side of the motor
base.
NOTE: When inquiring about the compressor or unit,
or ordering repair parts, provide the MODEL, SERIAL,
and FRICK SALES ORDER NUMBERS from these data
plates.
UNIT DATA PLATE
COMPRESSOR DATA PLATE

RWB II ROTARY SCREW COMPRESSOR UNITS
INSTALLATION
S70-210 IOM
Page 4
ALLOWABLE FLANGE LOADS
NOZ. MOMENTS (ft-lbf) LOAD (lbf)
SIZE AXIAL VERT. LAT. AXIAL VERT. LAT.
NPS MR MC ML P VC VL
1 25 25 25 50 50 50
1.25 25 25 25 50 50 50
1.5 50 40 40 100 75 75
2 100 70 70 150 125 125
3 250 175 175 225 250 250
4 400 200 200 300 400 400
5 425 400 400 400 450 450
6 1000 750 750 650 650 650
8 1500 1000 1000 1500 900 900
10 1500 1200 1200 1500 1200 1200
12 1500 1500 1500 1500 1500 1500
14 2000 1800 1800 1700 2000 2000
FOUNDATION
Each RWB II Rotary Screw Compressor Unit is shipped
mounted on a wooden skid which must be removed prior to
unit installation.
Allow space for servicing the unit.
A minimum of 36 inches around the
package is recommended.
The first requirement of the compressor foundation is that it
must be able to support the weight of the compressor pack-
age including coolers, oil, and refrigerant charge. Screw
compressors are capable of converting large quantities of
shaft power into gas compression in a relatively small space
and a mass is required to effectively dampen these relatively
high frequency vibrations.
Firmly anchoring the compressor package to a suitable
foundation by proper application of grout and elimination of
piping stress imposed on the compressor is the best insur-
ance for a trouble free installation. Use only the certified
general arrangement drawings from Frick to determine the
mounting foot locations and to allow for recommended clear-
ances around the unit for ease of operation and servicing.
Foundations must be in compliance with local building codes
and materials should be of industrial quality.
The floor should be a minimum of 6 inches of reinforced
concrete and housekeeping pads are recommended. Anchor
bolts are required to firmly tie the unit to the floor. Once the
unit is rigged into place (See RIGGING and HANDLING),
the feet must then be shimmed in order to level the unit. The
shims should be placed to position the feet roughly one inch
above the housekeeping pad to allow room for grouting. An
expansion-type epoxy grout must be worked under all areas
of the base with no voids and be allowed to settle with a slight
outward slope so oil and water can run off of the base.
When installing on a steel base, the following guidelines
should be implemented to properly design the system
base:
1. Use I-beams in the skid where the screw compressor will
be attached to the system base. They should run parallel to
the package feet and support the feet for their full length.
2. The compressor unit feet should be continuously welded to
the system base at all points of contact.
3. The compressor unit should not be mounted on vibration
isolators in order to hold down package vibration levels.
4. The customer’s foundation for the system base should fully
support the system base under all areas, but most certainly
under the I-beams that support the compressor package.
When installing on the upper floors of buildings, extra precau-
tions should be taken to prevent normal package vibration
from being transferred to the building structure. It may be
necessary to use rubber or spring isolators, or a combination
of both, to prevent the transmission of compressor vibration
directly to the structure. However, this may increase package
vibration levels because the compressor is not in contact with
any damping mass. The mounting and support of suction
and discharge lines is also very important. Rubber or spring
pipe supports may be required to avoid exciting the build-
ing structure at any pipe supports close to the compressor
package. It is best to employ a vibration expert in the design
of a proper mounting arrangement.
In any screw compressor installation, suction and discharge lines
should be supported in pipe hangers (preferably within 2 ft. of verti-
cal pipe run) so that the lines won’t move if disconnected from the
compressor. See table for Allowable Flange Loads.
A licensed architect should be consulted to determine the
proper foundation requirements for any large engine or
turbine drive.
When applying screw compressors at high pressures, the
customer must be prepared for package vibration and noise
higher than the values predicted for normal refrigeration duty.
Proper foundations and proper installation methods are vital;
and even then, sound attenuation or noise curtains may be
required to reduce noise to desired levels.
For more detailed information on Screw Compressor Founda-
tions, please request Frick publication S70-210 IB.
RIGGING and HANDLING
This screw compressor package
may be top-heavy. Use caution in
rigging and handling.
The unit can be moved with rigging, using a crane or forklift,
by hooking into the four lifting eyes on the compressor and
motor bases. If no motor is mounted, the lifting ring should
be moved to the compressor side of the center of the unit
because 60 percent of the weight is toward the compressor
end. If a motor is mounted appropriate adjustment in the lift-
ing point should be made to compensate for motor weight.
Adjustment of the lifting point must also be made for any
additions to the standard package such as an external oil
cooler, etc., as the center of balance will be effected.
The unit can be moved with a forklift by forking under the skid,
or it can be skidded into place with pinch bars by pushing
against the skid. NEVER MOVE THE UNIT BY PUSHING
OR FORKING AGAINST THE SEPARATOR SHELL OR ITS
MOUNTING SUPPORTS.
SKID REMOVAL
On horizontal packages that are rigged into place, the wood-
en skid can be removed by taking off the nuts and bolts that
are fastening the unit mounting supports to the skid before
lowering the unit onto the mounting surface.
If the unit is skidded into place remove the cross members
from the skid and remove the nuts anchoring the unit to the
skid. Using a 5 ton jack under the separator raise the unit at the
compressor end until it clears the two mounting bolts. Spread
the skid to clear the unit mounting support, then lower the unit
to the surface. Repeat procedure on opposite end.

RWB II ROTARY SCREW COMPRESSOR UNITS
INSTALLATION
S70-210 IOM
Page 5
DBZ-B HUB FACE MAXIMUM TOTAL CLAMP BOLT TORQUE
COUPLING SPACING +/- INDICATOR READING ft-lb Nm
SIZE in. mm in. mm in. mm LUB DRY LUB DRY
MOTOR MOUNTING
The following procedure is required only when the motor is
mounted at the job site.
1. Thoroughly clean the motor feet and mounting pads of
grease, burrs, and other foreign matter to ensure firm seat-
ing of the motor.
2. Attach the motor to the base using the bolts and motor-
raising blocks, if required. Bolt snugly through the base.
3. Weld the four kick bolts into place so that they are posi-
tioned to allow movement of the motor feet.
4. Now that the motor has been set, check to see that the
shafts are properly spaced for the coupling being used.
Refer to the coupling data tables on these pages for the
applicable dimension.
CHECKING MOTOR/COMPRESSOR ROTATION
Make sure coupling hubs are tight-
ened to the shaft before rotating the
motor to prevent them from flying
off and possibly causing serious injury or death.
COMPRESSOR ROTATION IS
CLOCKWISE WHEN FACING
THE END OF THE COMPRES-
SOR SHAFT. Under NO condi-
tions should the motor rotation be
checked with the coupling center
installed as damage to the com-
pressor may result. Bump the mo-
tor to check for correct compressor
rotation. After verification, install
gear or disk drive spacer, as applicable.
COMPRESSOR/MOTOR COUPLINGS
INSTALLATION
RWB II units are arranged for direct motor drive and require
a flexible drive coupling to connect the compressor to the
motor. Before installing, perform the following:
1. Inspect the shaft of the motor and compressor to ensure
that no nicks, grease, or foreign matter is present.
2. Inspect the bores in the coupling hubs to make sure that
they are free of burrs, dirt, and grit.
3. Check that the keys fit the hubs and shafts properly. NOTE:
Coupling keyways must be 180° opposed.
DBZ-B COUPLING – The Thomas DBZ-B coupling is used
on applications above 600 HP and with sleeve bearing mo-
tors that do not have axial end float constraint. The DBZ-B
coupling consists of two drive hubs and a flexible metal disc
drive spacer that is bolted to both hubs. A flexible steel disc
pack serves as the drive element. This disc pack is bolted to
the coupling hubs and prevents axial end float between the
compressor and motor shafts which may occur with sleeve
bearing motors. On sleeve bearing motors, the magnetic
center must be determined and maintained by securing the
coupling to the motor shaft with the shaft properly located.
Injury may occur if loose clothing,
etc. becomes entangled on the
spinning motor shaft.
If the motor is coupled to the compressor using a fixed-end-
play coupling, such as a DBZ-B coupling, and the motor is not
properly centered, additional thrust loads will be transmitted
to the compressor bearings that could result in premature
bearing failure. Install as follows:
1. Remove the eight locknuts and long bolts attaching the
center member to the disc pack.
2. Slide the disc pack and coupling hub assemblies on their
respective shafts.
3. Adjust the distance between hub faces as specified in the
DBZ-B Data Table by sliding the hubs. Key and secure hubs
to the shafts by tightening setscrews.
4. Reinstall the eight previously removed bolts and locknuts.
Alternately tighten each locknut as you would the lug nuts on
an automobile. NOTE: ALWAYS TURN THE NUT. NEVER
TURN THE BOLT.
5. Torque the locknuts to the value shown in the DBZ-B Data
Table for the size coupling being installed.
Lubricated and/or plated bolts and
locknuts develop higher bolt ten-
sion with less tightening than those
that are dry and not plated.
Torques for lubricated and/or plated bolts and locknuts will
generally fall in the lower range; while those that are dry or
as received from the factory fall into the upper range. Torque
readings should be observed while locknut is being turned.
6. Proceed to coupling alignment.
226 3-13/16 96.8 1/64 .40 .003 .076 22 43 29.8 58.3
263 4-5/16 109.5 1/32 .79 .004 .102 33 63 44.7 85.4
301 4-7/8 123.8 1/32 .79 .004 .102 50 95 67.8 128.8
351 5-7/8 149.2 1/32 .79 .004 .102 95 175 128.8 237.3
401 6-11/16 169.9 1/32 .79 .004 .102 120 200 162.7 271.2
DBZ-B COUPLING DATA TABLE

RWB II ROTARY SCREW COMPRESSOR UNITS
INSTALLATION
S70-210 IOM
Page 6
BP HUB FACE * DISC PACK CLAMP BOLT
SERIES SPACING BOLT TORQUE TORQUE DRY
SIZE in. mm ft-lb Nm ft-lb Nm
BP48 4.88 124 40 54 41 56
BP53 5.88 150 60 81 65 88
BP58 6.00 152 120 163 100 136
BP58 6.69 170 120 163 100 136
BP63 7.00 179 120 163 100 136
* Max total indicator reading .003 in. or .076 mm for all sizes.
All rotating power transmission equipment is potentially dangerous. Ensure that the couplings are
properly guarded prior to turning on the power. Coupling guards are provided with the equipment
and must be in place and secured properly while the equipment is in operation.
SERIES 52 COUPLING DATA TABLE
SERIES 52 COUPLING – The Thomas Series 52 coupling is
also used on applications above 600 HP. It has two drive hubs,
a center spool, and disc packs which are bolted between the
center spool and each drive hub. A center spool and two flex-
ible steel disc packs serve as the drive element. These three
parts, situated between the motor and compressor hubs,
prevent axial end float between the motor and compressor
shafts. End float tends to occur with sleeve bearing motors.
The magnetic center of the sleeve bearing motors must be
determined and maintained by securing the coupling hub to
the motor shaft with the shaft properly located.
Injury may occur if loose clothing,
etc. becomes entangled on the
spinning motor shaft.
If the motor is coupled to the compressor using a fixed-end-
play coupling such as the Series 52 coupling and the motor
is not properly centered, the additional thrust loads will be
transmitted to the compressor bearings. This additional thrust
could result in premature bearing failure. Install as follows:
1. Before proceeding with the alignment process, following
this section, disassemble the Series 52 coupling noting the
arrangement of bolts, washers, and nuts as THEY MUST
BE REPLACED IN THE SAME ORDER. Mark the adjoining
bolt holes of each part, the two hubs, the two disc packs,
and the center spool, so they are put back together in the
same position.
2. Mount the coupling hubs on their respective shafts. The
hub is bored for an interference fit on the shaft. Heating of
the coupling hub may be necessary for assembly. DO NOT
SPOT HEAT THE HUB as it may cause distortion. Heat in
water, oil, or use a SOFT open flame and quickly position
on the shaft.
3. Adjust the distance between hub faces, as specified in the
Series 52 Coupling Data Table, by sliding the hubs. Key and
secure the hubs to the shafts by tightening the set screws.
4. Reassemble the coupling with the disc packs and the
center spool. Ensure that they are reassembled exactly as
they were disassembled.
WOODS BP SERIES COUPLING – is also used on applica-
tions above 600 HP. It utilizes a center spool and two flexible
steel disc packs as the drive element. These three parts,
situated between the motor and compressor hubs, prevent
axial end float between the motor and compressor shafts.
End float tends to occur with sleeve bearing motors.
Injury may occur if loose clothing,
etc. becomes entangled on the
spinning motor shaft.
If the motor is coupled to the compressor using a fixed-end-
play coupling and the motor is not properly centered, the
additional thrust loads will be transmitted to the compressor
bearings. This additional thrust could result in premature
bearing failure. Install the BP Series coupling using the fol-
lowing instructions:
1. Before proceeding with the alignment process, following
this section, disassemble the BP Series coupling noting
the arrangement of bolts, washers, and nuts as THEY
MUST BE REPLACED IN THE SAME ORDER. Mark the
adjoining bolt holes of each part, the two hubs, the two disc
packs, and the center spool, so they are put back together
in the same position.
2. Slide the coupling hubs on their respective shafts.
3. Reassemble the coupling with the disc packs and the
center spool. Ensure that they are reassembled exactly
as they were disassembled. Torque disc pack hardware to
specification in BP Series Coupling Data Table.
4. Key and secure the hubs to the shafts by tightening the
clamping bolts. Make sure that the keyways are offset 180O
to maintain balance.
5. Torque the clamping bolts of both hubs to the torque value
given in the Data Table. DO NOT USE ANY LUBRICANT
ON THESE BOLTS.
6. Proceed to Coupling Alignment.
BP SERIES COUPLING DATA TABLE
225 5 127.0 1/32 .914 .004 .102 .004 .102 25 34.0
262 5 127.0 1/32 .914 .004 .102 .004 .102 30 40.7
312 5-1/2 139.7 3/64 1.295 .004 .102 .004 .102 40 54.2
350 6 152.4 3/64 1.295 .004 .102 .004 .102 95 128.8
375 7 177.8 1/16 1.574 .004 .102 .004 .102 130 176.3
425 7 177.8 1/16 1.574 .004 .102 .004 .102 175 237.3
450 8 203.2 1/16 1.574 .004 .102 .004 .102 200 271.2
500 9 228.6 5/64 2.083 .004 .102 .004 .102 260 352.5
COUP- HUB FACE MAX TOTAL INDICATOR READING CLAMP BOLT
LING SPACING +/- ANGULAR PARALLEL TORQUE (LUBE)
SIZE in. mm in. mm in. mm in. mm ft-lb Nm

RWB II ROTARY SCREW COMPRESSOR UNITS
INSTALLATION
S70-210 IOM
Page 7
Figure 1 - Angular Misalignment
COUPLING ALIGNMENT PROCEDURE
The life of the compressor shaft seal and bearings, as well
as the life of the motor bearings, is dependent upon proper
coupling alignment. Couplings may be aligned at the factory
but realignment MUST ALWAYS be done on the job site
after the unit is securely mounted on its foundation. Initial
alignment must be made prior to start-up and rechecked
after a few hours of operation. Final (HOT) field alignment
can only be made when the unit is at operating temperature.
After final (HOT) alignment has been made and found to be
satisfactory for approximately one week, the motor may be
dowelled to maintain alignment.
NOTE: Frick recommends cold aligning the motor .005"
high. This cold misalignment compensates for thermal
growth when the unit is at operating temperature.
The following procedure is applicable to both the CH and
DBZ-B couplings. Dial indicators are to be used to measu-
re the angular and parallel shaft misalignment. Coupling
alignment is attained by alternately measuring angular and
parallel misalignment and repositioning the motor until the
misalignment is within specified tolerances.
ALWAYS LOCK OUT MAIN MOTOR
DISCONNECT BEFORE TOUCHING
MOTOR SHAFT. MISALIGNMENT
MUST NOT EXCEED .004" FOR ALL CH, DBZ-B AND
SERIES 52 COUPLINGS EXCEPT DBZ-B 226 WHICH
SHALL NOT EXCEED .003".
ANGULAR ALIGNMENT
1. To check angular alignment, as shown in Figure 1, attach
dial indicator rigidly to the motor hub. Move indicator stem
so it is in contact with the outside face of compressor hub,
as shown in Figure 2.
NOTE: When DBZ-B couplings are used on motors
with sleeve bearings, it is necessary to secure the two
coupling hubs with a bolt to prevent them from drifting
apart when rotating.
2. Rotate both coupling hubs several revolutions until they
seek their normal axial positions.
Check the dial indicator to be sure that the indicator stem is
slightly loaded so as to allow movement in both directions.
3. Set the dial indicator at zero when viewed at the 12 o’clock
position, as shown in Figure 2.
4. Rotate both coupling hubs together 180° (6 o’clock posi-
tion), as shown in Figure 3. At this position the dial indicator
will show TOTAL angular misalignment.
NOTE: The use of a mirror is helpful in reading the indi-
cator dial as coupling hubs are rotated.
5. Loosen motor anchor bolts and move or shim motor to
correct the angular misalignment.
After adjustments have been made for angular misalignment
retighten anchor bolts to prevent inaccurate readings. Repeat
Steps 3 through 5 to check corrections. Further adjustments
and checks shall be made for angular misalignment until the
total indicator reading is within the specified tolerance.
Figure 2 - Dial Indicator Attached (At 12 O'clock)
Figure 3 - Dial Indicator At 6 O'clock

RWB II ROTARY SCREW COMPRESSOR UNITS
INSTALLATION
S70-210 IOM
Page 8
PARALLEL ALIGNMENT
6. To check parallel alignment, as shown in Figure 4, reposi-
tion dial indicator so the stem is in contact with the rim of the
compressor hub, as shown in Figure 5.
Check the dial indicator to be sure that the indicator stem is
slightly loaded so as to allow movement in both directions.
7. Check parallel height misalignment by setting dial indicator
at zero when viewed at the 12 o'clock position. Rotate both
coupling hubs together 180° (6 o'clock position). At this posi-
tion the dial indicator will show TWICE the amount of parallel
height misalignment.
8. Loosen motor anchor bolts and add or remove shims under
the four motor feet until parallel height misalignment is within
specified tolerance when anchor bolts are retightened.
CARE MUST BE USED WHEN
CORRECTING FOR PARALLEL
MISALIGNMENT TO ENSURE THAT
THE AXIAL SPACING AND ANGULAR MISALIGNMENT
IS NOT SIGNIFICANTLY DISTURBED.
9. After the parallel height misalignment is within tolerance,
repeat Steps 1 through 5 until angular misalignment is within
specified tolerance.
10. Check parallel lateral misalignment by positioning dial
indicator so the stem is in contact with the rim of the com-
pressor hub at 3 o'clock, as shown in Figure 6.
Set indicator at zero and rotate both coupling hubs together
180° (9 o'clock position), as shown in Figure 5.
Adjust parallel lateral misalignment using the motor adjusting
screws until reading is within specified tolerance.
11. Recheck angular misalignment and realign if neces-
sary.
12. Tighten motor anchor bolts and rotate both coupling hubs
together, checking the angular and parallel misalignment
through the full 360° travel at 90° increments. If dial readings
are in excess of specified tolerance realign as required.
13. When the coupling hubs have been aligned to within
specified tolerance, a recording of the cold alignment must
be made for unit records and usage during hot alignment.
Install the coupling guard before
operating the compressor.
When installing drive spacer, make
sure that hub spacing is within
limits shown on the Coupling Data
Table applicable to the coupling being installed and that
the clamping bolt(s) are properly torqued.
Figure 4 - Parallel Misalignment
Figure 5 - Dial Indicator Attached (At 9 O'clock)
Figure 6 - Dial Indicator At 3 O'clock

RWB II ROTARY SCREW COMPRESSOR UNITS
INSTALLATION
S70-210 IOM
Page 9
COMPRESSOR OIL
DO NOT MIX OILS of different
brands, manufacturers, or types.
Mixing of oils may cause exces-
sive oil foaming, nuisance oil level cutouts, oil pressure
loss, gas or oil leakage and catastrophic compressor
failure.
Use only Frick® refrigeration oil
and filters or warranty claims may
be denied.
The oil charge shipped with the unit is the best suited lu-
bricant for the conditions specified at the time of purchase.
If there is any doubt due to the refrigerant, operating pres-
sures, or temperatures, refer to Frick Pub. E160-802 SPC
for guidance.
INITIAL OIL CHARGE
The initial charging level is midway in the top sight glass
located midway along the oil separator shell (the sight glass
is located in the lower portion of the vertical separator).
Normal operating level is midway between the top sight
glass and bottom sight glass. The following table gives the
approximate oil charge quantity.
TABLE - BASIC OIL CHARGE (Gal)
* Includes total in oil sep-
arator and piping. Add
additional for oil cooler.
Add oil by attaching the end of a suitable pressure type
hose to the oil charging valve, located on the top of the oil
separator on the compressor end of the separator. Using a
pressure-type pump and the recommended Frick oil, open
the charging valve and pump oil into the separator. NOTE:
Fill slowly because oil will fill up in the separator faster
than it shows in the sight glass.
Oil distillers and similar equipment which act to trap oil must
be filled prior to unit operation to normal design outlet levels.
The same pump used to charge the unit may be used for
filling these auxiliary oil reservoirs.
NOTE: The sight glass located in the coalescing end
of the separator near the discharge connection should
remain empty.
496 (1)
676 (1)
856 (1)
1080 (1)
HOT ALIGNMENT OF COMPRESSOR/MOTOR
Hot alignments can only be made
after the unit has operated for sev-
eral hours and all components are
at operating temperatures.
Shut down the unit (proper lockout/tagout procedures
should be followed) and QUICKLY affix dial indicator to
coupling motor hub, then take readings of both the face and
rim of the compressor hub. If these readings are within toler-
ance, record reading, attach coupling guard and restart unit.
However, if the reading is not within limits, compare the hot
reading with the cold alignment and adjust for this difference;
i.e. if the rim at 0° and 180° readings indicates that the motor
rises .005" between its hot and cold state, .005" of shims
should be removed from under the motor.
After the initial hot alignment adjustment is made, restart unit
and bring to operating temperature. Shut down and recheck
hot alignment. Repeat procedure unit hot alignment is within
specified tolerance.
INSTALL COUPLING GUARD BE-
FORE OPERATING COMPRES-
SOR.
OIL PUMP COUPLING
Compressor units with prelube and direct motor/pump cou-
pled pumps need no pump/motor coupling alignment since
this is maintained by the close-coupled arrangement.
Some units utilize full and cycling lube pumps which have the
motor separate from the pump. These must be checked for
alignment due to possible misalignment which may be caused
by shipping and handling. Adjustments for that maximum mis-
alignment is less than 0.010" Total Indicator Runout (T.I.R.).
Failure to align the coupling may cause serious damage to the
pump, shaft seal, coupling, and motor bearings. Use the same
procedure as compressor/motor coupling alignment.
HOLDING CHARGE AND STORAGE
Each RWB II compressor unit is pressure and leak tested at
the Frick factory and then thoroughly evacuated and charged
with dry nitrogen to ensure the integrity of the unit during
shipping and short term storage prior to installation.
NOTE: Care must be taken when entering the unit to
ensure that the nitrogen charge is safely released.
Holding charge shipping gauges
on separator and external oil cooler
are rated for 30 PSIG and are for
checking the shipping charge only. They must be re-
moved before pressure testing the system and before
charging the system with refrigerant. Failure to remove
these gauges may result in catastrophic failure of the
gauge and uncontrolled release of refrigerant resulting
in serious injury or death.
All units must be kept in a clean, dry location to prevent
corrosion damage. Reasonable consideration must be
given to proper care for the solid-state components of the
microprocessor.
Unit which will be stored for more than two months must have
the nitrogen charge checked periodically.
BASIC*
CHARGE
(gal.)
RWB II
PLUS
MODEL
ADDITIONAL FOR OIL COOLER
REQ'D. (gal.)SIZE (in.)
6 X 60 6
8 X 60 10
6 X 120 12
8 X 120 20
10 X 120 28
12 X 120 39
16 X 120 45
1. Oil Basic Oil Charge
Sep.
Dia. Vertical Horiz.
42" 165 gal. 245 gal.
48" 220 gal. 330 gal.
54" 275 gal. –
60" 385 gal. –
66" 385 gal. –
72" 385 gal. –

RWB II ROTARY SCREW COMPRESSOR UNITS
INSTALLATION
S70-210 IOM
Page 10
OIL HEATER(S)
Standard units are equipped with 2 or 3 500 or 1000 watt oil
heaters, providing sufficient heat to maintain the oil tempera-
ture for most indoor applications during shutdown cycles to
permit safe start-up. Should additional heating capacity be
required because of low ambient, contact Frick. The heater(s)
is energized only when the unit is not in operation.
Do not energize the heater(s) when
there is no oil in the unit, the heat-
er(s) will burn out. The oil heater(s)
will be energized whenever 120 volt control power is
applied to the unit and the compressor is not running,
unless the 16 amp circuit breaker in the micro enclosure
is turned off.
OIL FILTER(S)
Use of filter elements other than
Frick may cause warranty claim
may to be denied.
The oil filter(s) and coalescer filter element(s) shipped with
the unit are best suited to ensure proper filtration and opera-
tion of the system.
LIQUID INJECTION OIL COOLING
The liquid injection system provided on the unit is self-con-
tained but requires the connection of the liquid line sized as
shown in the table and careful insertion of the expansion valve
bulb into the thermowell provided in the separator.
There are two forms of liquid injection cooling, balanced
pressure and temperature/pressure-compensated.
• In the TXV balance pressure valve, the high-pressure
conection is made through the regulator to the external port
on the liquid injection valve to control oil temperature.
• In the Jordan temperature pressure compensated
valve, no external high-pressure connection is required.
The thermal bulb supplies all necessary pressure to the
valve for increasing or decreasing the required amount
of refrigerant.
NOTE: For booster applications the high pressure gas
connection must be taken from a high side source (high
stage compressor discharge). This should be a 3/8" line
connected into the solenoid valve provided. This gas is
required by the expansion valve external port to control
oil temperature.
It is IMPERATIVE that an uninterrupted supply of high pres-
sure liquid refrigerant be provided to the injection system at
all times. Two items of EXTREME IMPORTANCE are the
design of the receiver/liquid injection supply and the size of
the liquid line.
It is recommended that the receiver be oversized sufficiently
to retain a 5 minute supply of refrigerant for oil cooling. The
evaporator supply must be secondary to this consideration.
Two methods of accomplishing this are shown.
The Dual Dip Tube method uses two dip tubes in the receiver.
The liquid injection tube is below the evaporator tube to en-
sure continued oil cooling when the receiver level is low.
LIQUID LINE SIZES/RECEIVER VOLUME
Liquid line sizes and the additional receiver volume (quantity
of refrigerant required for 5 minutes of liquid injection oil
cooling) are given in the following table:
LIQUID LINE SIZE and RECEIVER VOLUME
Figure 7 - Dual Dip Tube Method
Figure 8 - LEVEL CONTROL METHOD
The Level Control method utilizes a float level control on
the receiver to close a solenoid valve feeding the evapora-
tor when the liquid falls below that amount necessary for 5
minutes of liquid injection oil cooling.
* Based on 100 foot liquid line. For longer runs, increase line
size accordingly.
LINE SIZE* POUND LIQUID
RWF II SCH 80 OD PER VOLUME
MODEL PIPE TUBING 5 MIN. CU FT
R-717 HIGH STAGE*
496 2 – 310 8.5
676 2 – 420 11.5
856 2 – 650 18
R-717 BOOSTER*
496 1 – 50 1.5
676 1 – 70 2.0
856 1-1/4 – 125 3.5
1080 1-1/4 – 155 4.4
R-22 HIGH STAGE*
496 2-1/2 2-5/8 1,300 18.0
676 3 2-5/8 1,780 25.0
856 3 2-5/8 1,960 27.0
R-22 BOOSTER*
496 1-1/4 1-1/8 114 1.6
676 1-1/4 1-1/8 156 2.2
856 1-1/4 1-1/8 266 3.7
1080 1-1/4 1-1/8 335 4.6

RWB II ROTARY SCREW COMPRESSOR UNITS
INSTALLATION
S70-210 IOM
Page 11
WATER-COOLED OIL COOLING (OPTIONAL)
The plate and shell type water-cooled oil cooler is mounted
on the unit complete with all oil piping. The customer must
supply adequate water connections. Determine the size of the
water-cooled oil cooler supplied with the unit, as outlined on
the Frick P&I diagram and arrangement drawings. The water
supply must be sufficient to meet the required flow.
Frick recommends a closed-loop system for the waterside
of the oil cooler. Careful attention to water treatment is es-
sential to ensure adequate life of the cooler if cooling tower
water is used. It is imperative that the condition of cool-
ing water and closed-loop fluids be analyzed regularly
and as necessary and maintained at a pH of 7.4, but not
less than 6.0 for proper heat exchanger life. After initial
start-up of the compressor package, the strainer at the inlet
of the oil cooler should be cleaned several times in the first
24 hours of operation.
In some applications, the plate and shell oil cooler may be
subjected to severe water conditions, including high tem-
perature and/or hard water conditions. This causes accel-
erated scaling rates which will penalize the performance of
the heat exchanger. A chemical cleaning process will extend
the life of the Plate and Shell heat exchanger. It is important
to establish regular cleaning schedules.
Cleaning: A 3% solution of Phosphoric or Oxalic Acid is
recommended. Other cleaning solutions can be obtained from
your local distributor, but they must be suitable for stainless
steel. The oil cooler may be cleaned in place by back flushing
with recommended solution for approximately 30 minutes.
After back flushing, rinse the heat exchanger with fresh water
to remove any remaining cleaning solution.
TABLE 2 - OIL COOLER DATA
TYP COOLER CONNECTION
RWF II MODEL DIA PLATES INLET OUTLET
496 - 676 Hi Stage 24 in. 188 4 in. 5 in.
496 - 856 Booster 24 in. 72 3 in. 3 in.
1080 Booster 24 in. 136 4 in. 5 in.
2. A shell and tube oil cooler with:
Shell Side: Oil 400 lb design
Tube Side: Refrigerant 400 lb design
Due to the many variations in refrigeration system design
and physical layout, several systems for assuring the above
criteria are possible.
SYSTEM OPERATION - Liquid refrigerant fills the cooler
tube side up to the Thermosyphon receiver liquid level
(Figure 9).
Figure 9
Hot oil (above the liquid temperature) flowing through the
cooler will cause some of the refrigerant to boil and vaporize
in the tubes. The vapor rises in the return line. The density of
the refrigerant liquid/vapor mixture in the return line is consider-
ably less than the density of the liquid in the supply line. This
imbalance provides a differential pressure that sustains a flow
condition to the oil cooler. This relationship involves:
1. Liquid height above the cooler.
2. Oil heat of rejection.
3. Cooler size and piping pressure drops.
Current thermosyphon systems are using single-pass oil
coolers and flow rates based on 3:1 overfeed.
The liquid/vapor returned from the cooler is separated in
the receiver. The vapor is vented to the condenser inlet and
need only be reliquified since it is still at condenser pressure
(Figure 10).
HOT OIL IN FROM SEPARATOR
120-140 F OIL OUT
O
TO SYSTEM CONDENSER
95 F
36#/FT
O
3
95 F
36#/
FT
O
3
TS RECEIVER
THERMOSYPHON OIL COOLING (OPTIONAL)
Thermosyphon oil cooling is an economical, effective method
for cooling oil on screw compressor units. Thermosyphon
cooling utilizes liquid refrigerant at condenser pressure and
temperature which is partially vaporized at the condenser
temperature in a shell and tube vessel cooling the oil. The
vapor, at condensing pressure, is vented to the condenser
inlet and reliquified. This method is the most cost effective
of all currently applied cooling systems since no compressor
capacity is lost or compressor power penalties incurred. The
vapor from the cooler need only be condensed, not com-
pressed. Refrigerant flow to the cooler is automatic, driven
by the thermosyphon principle and cooling flow increases
as the oil inlet temperature rises.
EQUIPMENT - The basic equipment required for a ther-
mosyphon system consists of:
1. A source of liquid refrigerant at condensing pressure and
temperature located in close proximity to the unit to mini-
mize piping pressure drop. The liquid level in the refrigerant
source must be 6 to 8 feet minimum above the center of the
oil cooler. Figure 10

RWB II ROTARY SCREW COMPRESSOR UNITS
INSTALLATION
S70-210 IOM
Page 12
OIL TEMPERATURE CONTROL - Oil temperature will gen-
erally run about 15 - 35°F above condensing temperature.
In many cases, an oil temperature control is not required if
condensing temperature is above 65°F as oil temperature
can be allowed to float with condenser temperature.
Condensing Temperature: 65°F - 105°F
Oil Temperature: 80°F - 140°F
INSTALLATION - The shell and tube-type thermosyphon oil
cooler with oil-side piping and a thermostatically controlled
mixing valve (if ordered) are factory mounted and piped. The
customer must supply and install all piping and equipment
located outside of the shaded area on the piping diagram
with consideration given to the following:
1. The refrigerant source, thermosyphon or system receiver,
should be in close proximity to the unit to minimize piping
pressure drop.
2. The liquid level in the refrigerant source must be 6 to 8
feet minimum above the center of the oil cooler.
3. A safety valve should be installed if refrigerant isolation
valves are used for the oil cooler.
TSOC AND WCOC OIL SIDE SAFETY RELIEF - Compres-
sor units assembled after January 1995, which have valves
in the oil piping to isolate the oil cooler from the oil separator
for servicing, may have factory installed piping to relieve the
shell side (oil side) safety valve directly into the oil separator,
as shown in the P & I diagrams section.
This arrangement uses a special UV stamped safety valve
rated for liquid and vapor relief. The safety valve is designed
for 500 psi DWP and is set to relieve at 75 psi delta P. The
safety valve piping contains flanged connections should the
valve require maintenance or replacement.
EXTRA CAUTION SHOULD BE
USED WHEN SERVICING AN OIL
SEPARATOR WITH THIS ARRANGE-
MENT. IF THE OIL COOLER IS VALVED OFF FROM AN
OIL SEPARATOR WHICH HAS BEEN EVACUATED FOR
SERVICING, THEN THE OIL COOLER COULD RELIEVE
INTO THE SEPARATOR VESSEL IF THE 75 PSI DELTA P
SETPOINT IS EXCEEDED.
Other units, which do not use this special safety valve ar-
rangement, will have factory mounted safety valves on the
shell side of the oil cooler which the installing contractor
should pipe into house safety systems designated suitable
for oil relief.
The component and piping arrangement shown in Figure
11 is intended only to illustrate the operating principles of
thermosyphon oil cooling. Other component layouts may be
better suited to a specific installation. Refer to publication
E70-900E for additional information on Thermosyphon Oil
Cooling.
Figure 11
1. The thermosyphon oil cooler is supplied with oil side piped to the compressor unit and stub ends supplied on refrigerant side.
2. A three-way oil temperature control valve is required where condensing temperature is expected to go below 65°F.
3. A refrigerant-side safety valve is required in this location only when refrigerant isolation valves are installed between the cooler and
thermosyphon receiver. If no valves are used between the cooler and TSOC receiver, the safety valve on the TSOC receiver must be
sized to handle the volume of both vessels. Then, the safety valve on the cooler vent (liquid refrigerant side) can be eliminated.
4. The system receiver must be below the thermosyphon receiver in this arrangement.
BC
A
OIL TEMP
CONTROL VALVE
HOTCOOL
OIL OUT
HOT OIL IN
THERMOSYPHON
OIL COOLER
LIQUID
LEVEL
STATIC HEAD
TO OVERCOME
CONDENSER
PRESSURE DROP
8 Ft.
Min.
SYSTEM
CONDENSER
SAFETY
VALVE
VAPOR
THERMOSYPHON
RECEIVER
LIQUID OVERFLOW
DRAIN TO RECEIVER
TO SYSTEM
EVAPORATOR
SYSTEM
RECEIVER
1
3
4
(Mounted below Thermosyphon
receiver level)
2
TSOCA
Refrigerant-side drain valve
required for plate-type
thermosyphon oil coolers.

RWB II ROTARY SCREW COMPRESSOR UNITS
INSTALLATION
S70-210 IOM
Page 13
ECONOMIZER - HIGH STAGE (OPTIONAL)
The economizer option provides an increase in system ca-
pacity and efficiency by subcooling liquid from the condenser
through a heat exchanger or flash tank before it goes to the
evaporator. The subcooling is provided by flashing liquid in
the economizer cooler to an intermediate pressure level.The
intermediate pressure is provided by a port located part way
down the compression process on the screw compressor.
As the screw compressor unloads, the economizer port will
drop in pressure level, eventually being fully open to suction.
Because of this, an output from the microprocessor is gener-
ally used to turn off the supply of flashing liquid on a shell
and coil or DX economizer when the capacity falls below
approximately 45%-60% (85%-90% slide valve position).
This is done because the compressor will be more efficient
operating at a higher slide valve position with the economizer
turned off, than it will at a low slide valve position with the
economizer turned on. Please note, however, that shell and
coil and DX economizers can be used at low compressor
capacities in cases where efficiency is not as important as
ensuring that the liquid supply is subcooled. In such cases,
the economizer liquid solenoid can be left open whenever
the compressor is running.
Due to the tendency of the port pressure to fall with decreasing
compressor capacity, a back-pressure regulator valve (BPR)
is generally required on a flash economizer system (Fig. 14)
in order to maintain some preset pressure difference between
the subcooled liquid in the flash vessel and the evaporators.
If the back-pressure regulator valve is not used on a flash
economizer, it is possible that no pressure difference will exist
to drive liquid from the flash vessel to the evaporators, since
the flash vessel pressure will approach suction pressure at a
decreased slide valve position. In cases where wide swings
in pressure are anticipated in the flash economizer vessel, it
may be necessary to add an outlet pressure regulator to the
flash vessel outlet to avoid overpressurizing the economizer
port, which could result in motor overload. Example: A system
feeding liquid to the flash vessel in batches.
The recommended economizer systems are shown below.
Notice that in all systems there should be a strainer (STR)
and a check valve (VCK) between the economizer vessel
and the economizer port on the compressor. The strainer
prevents dirt from passing into the compressor and the check
valve prevents oil from flowing from the compressor unit to
the economizer vessel during shutdown.
Other than the isolation valve
needed for strainer cleaning, it is
essential that the strainer be the
last device in the economizer line before the compres-
sor. Also, piston-type check valves are recommended
for installation in the economizer line, as opposed to
disc-type check valves. The latter are more prone to gas-
pulsation-induced failure. The isolation and check valves
and strainer should be located as closely as possible to
the compressor, preferably within a few feet.
For refrigeration plants employing multiple compressors on
a common economizing vessel, regardless of economizer
type, each compressor must have a back-pressure regulat-
ing valve in order to balance the economizer load, or gas
flow, between compressors. The problem of balancing load
becomes most important when one or more compressors
run at partial load, exposing the economizer port to suction
pressure. In the case of a flash vessel, there is no need for
the redundancy of a back-pressure regulating valve on the
vessel and each of the multiple compressors. Omit the BPR
valve on the flash economizer vessel and use one on each
compressor, as shown in Fig. 15. It is also recommended that
the back-pressure regulating valves, used on economizer
lines, should be specified with electric shutoff option. The
electric shutoff feature is necessary to prevent flow from the
common economizer vessel to the suction side of a stopped
compressor, through the suction check valve bypass line, if
the other compressors and the common economizer vessel
are still operating and the HV2 valve on the suction bypass
is open.
FIG. 13 - Direct Expansion Economizer System
FIG. 12 - Shell and Coil Economizer System
FIG. 15 - Multiple Compressor Economizer System
FIG. 14 - Flash Economizer System

RWB II ROTARY SCREW COMPRESSOR UNITS
INSTALLATION
S70-210 IOM
Page 14
For refrigeration plants using a Packaged Refrigerant Recir-
culation (PRR) unit and a direct expansion (DX) economizer
system it is necessary to operate the liquid feed solenoid on
the PRR unit and the liquid feed solenoid on the DX vessel
off of a common signal to avoid liquid overfeed on the DX
economizer system.
ECONOMIZER LOAD BALANCING
The most energy efficient manner to operate an economizer
system, when using multiple compressors on a common
economizer vessel, is to take as much of the flash gas as
possible to the compressors that are fully loaded. This can
be done in at least two ways.
1. Use the economizer output from the microprocessor to
turn off a solenoid, or to actuate the electric shutoff option
on a back-pressure regulator, based on percent of slide valve
travel. This will direct all the flash vapor to the other loaded
compressors.
2. A dual-setpoint back-pressure regulator valve can be used
in each of the individual economizer vapor lines. When a com-
pressor is running near full load, the BPR valve will operate
on the desired setpoint, or basically wide open, to minimize
pressure drop in the line. When one compressor unloads
below the slide valve position where the economizer output
on the microprocessor turns on, the dual-setpoint feature of
the regulator can be actuated by this output to control the
pressure, on the vessel side of the regulator, to be a few psi
higher. Consequently, the flash gas will be sent to the loaded
compressors first, until they can’t handle all the vapor and
the pressure in the vessel starts to rise. Then, some of the
vapor will go to the unloaded compressor to help maintain
the vessel at the desired pressure. An example of a back-
pressure regulator with electric shutoff and the dual-setpoint
feature is an R/S A4ADS.
ELECTRICAL
NOTE: Before beginning electrical installation, read
the instructions in the section "Proper Installation of
Electronic Equipment".
RWB II units are supplied with a QUANTUM™ control system.
Care must be taken that the controls are not exposed to physi-
cal damage during handling, storage, and installation. The
microprocessor enclosure cover must be kept tightly closed
to prevent moisture and foreign matter from entering.
All customer connections are
made in the Quantum control panel
mounted on the unit. This is the
ONLY electrical enclosure and should be kept tightly
closed whenever work is not being done inside.
MOTOR STARTER PACKAGE
Motor starter and interlock wiring requirements are shown in
the wiring diagram above. All the equipment shown is sup-
plied by the installer unless a starter package is purchased
from Frick. Starter packages should consist of:
1. The compressor motor starter of the specified HP and
voltage for the starting method specified (across-the-line,
autotransformer, wye-delta, or solid-state).
NOTE: If starting methods other than across-the-line are
desired, a motor/compressor torque analysis must be
done to ensure that sufficient starting torque is available,
particularly in booster applications. Contact FRICK if
assistance is required.
2. If specified, the starter package can be supplied as a
combination starter with circuit breaker disconnect. However,
the motor overcurrent protection/disconnection device can
be applied by others, usually as a part of an electrical power
distribution board.
3. The oil pump starter with fuses, or in the case where the
compressor motor is a different voltage from the oil pump
motor, with a circuit breaker disconnect suitable for separate
power feed.
4. A 2.0 KVA control power transformer (CPT) to supply 120
volt control power to the microprocessor control system and
separator oil heaters is included. If environmental conditions
require more than the usual two 500 watt oil heaters, an ap-
propriately oversized control transformer will be required. If
frequent power fluctuations are anticipated or extremely noisy
power lines are encountered, a regulating control transformer
should be considered. Contact FRICK for assistance.
5. For customer-supplied across-the-line starters, a shunt-
ing devicemust be installed across the Current Transformer
(terminals 3 & 4).
If the shunting device is not installed, the SBC board may
be severly damaged at start-up (see Figure 16).
Figure 16 - Starter Wiring Diagram
6. The compressor motor Current Transformer (CT) is in-
stalled on any one phase of the compressor leads.
NOTE: The CT must see all the current of any one phase,
therefore in wye-delta applications BOTH leads of any
one phase must pass through the CT.
7. One each normally open compressor motor and oil pump
motor starter auxiliary contact should be supplied and in
addition to the compressor and oil pump motor starter coils,
the CT and CPT secondaries wired as shown on the starter

RWB II ROTARY SCREW COMPRESSOR UNITS
INSTALLATION
S70-210 IOM
Page 15
MINIMUM BURDEN RATINGS
The following table gives the minimum CT burden ratings.
This is a function of the distance between the motor starting
package and the compressor unit.
BURDEN MAXIMUM DISTANCE FROM
RATING FRICK PANEL
USING # USING # USING #
ANSI VA 14 AWG 12 AWG 10 AWG
B-0.1 2.5 15 ft 25 ft 40 ft
B-0.2 5 35 ft 55 ft 88 ft
B-0.5 12.5 93 ft 148 ft 236 ft
REMOVE JUMPERS 6 TO 6B & 2 TO 2B
DC POWER
EMI FILTER
SUPPL
Y
SEE SOLA CONNECTION CHARTS FOR
INPUT & OUTPUT CONNECTIONS
6
REMOVE FERRITE TUBE
WHEN SOLA IS ADDED,
6B
6
H
NOTE: AT SOLA ASSEMBLY, MAKE WIRES 6, 2, GND, 6B, & 2B,
10 FT LONG. CUT WIRES TO LENGTH AT INSTALLATION
H5
REGULATOR
H3H4
OUTPUT
INPUT
X1
120/240 V. IN, 120 V. OUT
SOLA #63-23-112-4, 120 VA, 60 HZ
SHOWN HERE- CONSULT FRICK
FOR OTHER VOLTAGES/HZ
SOLA ENCLOSURE
GND TERM
2A
6A
2
3
PS 1
1
LINE
LOAD
GREEN
FERRITE
TUBE
2B 2
GND LUG IN
H2 H1
LUG
X2
GREEN
GND TERM
IN MICRO
2
N
package wiring diagram. The load on the control panel for
the compressor motor starter coil should not exceed 1 Nema
size 3 starter. For larger starters, an interposing relay must
be used to switch the compressor motor starter coil(s).
NOTE: Do not install a compressor HAND/OFF/AUTO
switch in the starter package as this would bypass the
compressor safety devices.
Figure 17 - Recommended Regulator Installation
BATTERY BACKUP
The battery backup is used only for date and time retention
during power interruption. All setpoints and other critical
information are saved to onboard flash memory.
NOTE: It is not necessary to disconnect the battery
backup during extended downtime.
CONTROL POWER REGULATOR
Compressor units that will be used in areas that suffer brown-
outs and other significant power fluctuations can be supplied
with a control power regulator. See Figure 17, Recommended
Regulator Installation.
CURRENT TRANSFORMER (CT) RATIOS
The CT ratio for various motor sizes (with a 5 amp second-
ary) is given in the following table:
VOLTAGE
HP 200 230 380 460 575 2300 4160
100 400:5 300:5 200:5 200:5 200:5 – –
125 500:5 400:5 300:5 200:5 200:5 – –
150 600:5 500:5 300:5 300:5 200:5 – –
200 800:5 600:5 400:5 300:5 300:5 100:5 50:5
250 800:5 800:5 500:5 400:5 300:5 100:5 50:5
300 1000:5 1000:5 600:5 500:5 400:5 100:5 50:5
350 – 1000:5 800:5 500:5 500:5 100:5 100:5
400 – – 800:5 600:5 500:5 200:5 100:5
450 – – 1000:5 800:5 600:5 200:5 100:5
500 – – 1000:5 800:5 600:5 200:5 100:5
600 – – 1200:5 1000:5 800:5 200:5 100:5
700 – – – 1200:5 1000:5 200:5 200:5
800 – – – – 1000:5 300:5 200:5
900 – – – – 1200:5 300:5 200:5
1000 – – – – – 300:5 200:5
1250 – – – – – 400:5 200:5
1500 – – – – – 500:5 300:5
2000 – – – – – 600:5 300:5
2500 – – – – – 700:5 400:5
3000 – – – – – 800:5 500:5
3500 – – – – – 900:5 500:5
4000 – – – – – 1000:5 600:5

RWB II ROTARY SCREW COMPRESSOR UNITS
OPERATION
S70-210 IOM
Page 16
OPERATION and START-UP INSTRUCTIONS
The Frick RWB II Rotary Screw Compressor Unit is an inte-
grated system consisting of six major subsystems:
1. Control Panel (See publications S90-010 O,M, & CS for
Quantum Panel and S70-200 OM for the Plus panel).
2. Compressor
3. Compressor Lubrication System
4. Compressor Oil Separation System
5. Compressor Hydraulic System
6. Compressor Oil Cooling System
The information in this section of the manual provides the
logical step-by-step instructions to properly start up and
operate the RWB II Rotary Screw Compressor Unit.
THE FOLLOWING SUBSECTIONS MUST BE READ AND
UNDERSTOOD BEFORE ATTEMPTING TO START OR
OPERATE THE UNIT.
TDSH COMPRESSOR
The Frick RWB II rotary screw compressor utilizes mating
asymmetrical profile helical rotors to provide a continuous
flow of refrigerant vapor and is designed for both high pres-
sure and low pressure applications. The compressor incorpor-
ates the following features:
1. High capacity roller bearings to carry radial loads at both
the inlet and outlet ends of the compressor.
2. Heavy-duty, four-point angular contact ball bearings
to carry axial loads are mounted at the discharge end of
compressor.
3. Balance pistons located in the inlet end of the compressor
to reduce axial loads on the axial load bearings and increase
bearing life.
4. Moveable slide valve to provide infinite step capacity
control from 100 to approximately10%.
5. VOLUMIZER® volume ratio control to allow infinitely vari-
able volume ratio from 2.4 to 4.5 during compressor operation
for all models.
6. A hydraulic unloader cylinder to operate the slide stop
and slide valve.
7. Bearing and casing design for 350 PSI discharge pressure.
This PSI rating applies only to the compressor and does
not reflect the design pressure of the various system
components.
8. All bearing and control oil vented to closed thread in the
compressor instead of suction port to avoid performance
penalties from superheating suction gas.
9. Shaft seal design to maintain operating pressure on seal
well below discharge pressure, for increased seal life.
10. Oil injected into the rotors to maintain good volumetric and
adiabatic efficiency even at very high compression ratios.
11. Shaft rotation clockwise facing compressor, suitable for
all types of drives. SEE CAUTION.
12. Dual compressor casing design for very low airborne
noise transmission.
COMPRESSOR ROTATION IS
CLOCKWISE WHEN FACING THE
COMPRESSOR DRIVE SHAFT. THE COMPRESSOR
SHOULD NEVER BE OPERATED IN REVERSE ROTA-
TION AS BEARING DAMAGE WILL RESULT WHICH CAN
CAUSE CATASTROPHIC FAILURE OF THE COMPRES-
SOR.
Figure 18 - Compressor Rotation Direction
COMPRESSOR LUBRICATION SYSTEM
The lubrication system on an RWB II screw compressor unit
performs several functions:
1. Provides lubrication to bearings and seal.
2. Provides a cushion between the rotors to minimize noise
and vibrations.
3. Helps keep the compressor cool and prevents
overheating.
4. Provides an oil supply to hydraulically actuate the slide
valve and slide stop.
5. Provides oil pressure to the balance pistons to help in-
crease bearing life.
6. Provides an oil seal between the rotors to prevent rotor
contact or gas bypassing.
The compressor unit may be equipped with either a prelube,
full-lube or cycling full-lube lubrication system. Additionally,
either system may contain dual oil filters and liquid injection,
water-cooled, or thermosyphon oil cooler for compressor
oil cooling.
PRELUBE OIL SYSTEM
The RWB II screw compressor unit is designed to be self-lu-
bricating. Oil being supplied to the compressor from the oil
separator is at system head pressure. Within the compressor,
oil porting to all parts of the compressor is vented back to a
point in the compressor’s body that is at a pressure lower than
compressor discharge pressure. The compressor’s normal
operation makes the compressor unit operate essentially as
its own oil pump. All oil entering the compressor is moved by
the compressor rotors out the compressor outlet and back
to the oil separator.
For normal operation an oil pump is not required except to
lubricate the compressor during start-up. During the period
from start-up to normal operation, the oil pressure alarm and
oil pressure cutout setpoints will vary according to formulas
built into the microprocessor control program. On start-up
the PRELUBE pump has 30 seconds to produce over five
pounds of oil pressure over registered discharge pressure or
a cutout will occur. When the compressor starts, oil pressure
will be ignored for two minutes. After 25 PSID pressure dif-
ferential has been reached between suction and discharge,
the PRELUBE pump will shut down and the lubrication oil will

RWB II ROTARY SCREW COMPRESSOR UNITS
OPERATION
S70-210 IOM
Page 17
COMPRESSOR OIL SEPARATION SYSTEM
The RWB II is an oil flooded screw compressor. Most of the oil
discharged by the compressor separates from the gas flow in
the oil charge reservoir. Some oil, however, is discharged as
a mist which does not separate readily from the gas flow and
is carried past the oil charge reservoir. One or more coalescer
filter elements then COALESCE the oil mist into droplets, the
droplets of oil fall to the bottom of the coalescer section of
the oil separator. The return of this oil to the compressor is
controlled by a needle valve on both high stage and booster
applications (see Figures 19 and 20).
NOTE: Open needle valve only enough to keep coalescer
end of separator free of oil.
The sight glass located near the bottom of the coalescer
section of the oil separator should remain empty during
normal operation. If an oil level develops and remains in the
sight glass, a problem in the oil return separation system or
compressor operation has developed. Refer to Maintenance
for information on how to correct the problem.
NOTE: Normal Operating Level is midway between the
two sight glasses as shown in Figures 19 and 20.
OIL SEPARATION SYSTEMS
HORIZONTAL VERTICAL
be supplied by the pressure differential. If after five minutes
25 PSID has not been reached, the unit will shutdown on
DCO cutout.
NOTE: For alarm descriptions and shutdown or cutout
parameters, see S90-010 O (Quantum) or S70-200 OM
(Plus).
CYCLING FULL-LUBE OIL SYSTEM
This system is designed to provide those high stage appli-
cations that operate with normal to low differential pressure
across the compressor suction and discharge with adequate
compressor lubrication.
During the period from start-up to normal operation the oil pres-
sure alarm and oil pressure cutout setpoints will vary accord-
ing to formulas built into the microprocessor control program.
On start-up, the solenoid valve in the main injection feed is
closed to allow oil to feed into the slide valve and bearing
ports only. After the compressor starts and the pressure is
between 5 PSI and 10 PSI differential, the prealarm signal is
activated. If the oil pressure is above 10 PSI, the alarm can
be cleared. The pump will continue to run until the discharge
pressure is 55 PSI over suction pressure, then it will shut
down. When the pressure differential falls below 45 PSI, the
pump will start again.
NOTE: For alarm and shutdown or cutout values, see
S90-010 O (Quantum) or S70-200 OM (Plus).
FULL-LUBE OIL SYSTEM
RWB II booster compressors and high stage compressors
that operate with very low differential pressures across the
compressor suction and compressor discharge require a full
time oil pump to produce the oil flow and pressures required.
Oil is pumped from the oil separator through the oil filter to the
main oil injection feed and the compressor. An oil pressure
regulating valve downstream of the pump is used to regulate
oil pressure at the compressor by returning excess oil to the
separator. During the start-up sequence, the solenoid valve
in the main oil injection feed is closed to allow oil to feed into
the slide valve and bearing ports only.
Oil pressure on RWB II compressors with full time oil pumps
should be adjusted to provide 20 - 25 PSI (high stage) or
30 - 35 PSI (booster) pounds of oil pressure at the highest
normal head pressure or intermediate pressure expected
with the compressor fully loaded. The compressor will require
maximum oil flow under these conditions.
Figure 19 Figure 20

RWB II ROTARY SCREW COMPRESSOR UNITS
OPERATION
S70-210 IOM
Page 18
COMPRESSOR HYDRAULIC SYSTEM
The compressor hydraulic system moves the movable slide
valve (MSV) to load and unload the compressor. It also moves
the movable slide stop (MSS) to increase or decrease the
compressor’s volume ratio (Vi).
The hydraulic cylinder located at the inlet end of the TDS
compressor serves a dual purpose. It is separated by a fixed
bulkhead into two sections. The movable slide valve (MSV)
section is to the left of the bulkhead and the movable slide
stop (MSS) to the right. Both sections are considered double
acting hydraulic cylinders as oil pressure moves the pistons
in either direction.
Both sections are controlled by double-acting, four-way
solenoid valves which are actuated when a signal from the
appropriate microprocessor output energizes the solenoid
valve. See Figures 21 and 22.
Compressor Loading: The compressor loads when MSV
solenoid YY2 is energized and oil flows from the oil manifold
through valve ports P and B to cylinder port SC-2 and enters
the load side of the cylinder. Simultaneously, oil contained in
the unload side of the cylinder flows out cylinder port SC-1
through valve ports A and T to compressor closed thread
port.
Compressor Unloading: The compressor unloads when
MSV solenoid YY1 is energized and oil flows from the oil
manifold through valve ports P and A to cylinder port SC-1
and enters the unload side of the cylinder. Simultaneously, oil
contained in the load side of the cylinder flows out compres-
sor port SC-2 through valve ports B and T to compressor
closed thread port.
NOTE: High Stage Operation: An alternative piping ar-
rangement has been provided to increase slide valve
response time during high stage operation.
Higher operating pressures will slow the compressor unload-
ing response time. Unloading response time can be increased
by closing valve 1 (oil manifold pressure) and opening valve
2 to compressor suction pressure. See illustrations. NEVER
OPEN VALVE 1 AND VALVE 2 AT THE SAME TIME DUR-
ING COMPRESSOR OPERATION.
VOLUMIZER® VOLUME RATIO CONTROL
Vi Increase
The volume ratio Vi is increased when the MSS solenoid
valve YY3 is energized and oil flows from oil manifold through
valve ports P and A to compressor port SC-3, enters the
increase side of the cylinder and overcomes the decrease
spring tension.
Vi Decrease
The volume ratio Vi is decreased when the MSS solenoid
valve YY4 is energized and oil flows from the cylinder through
compressor port SC-3, through valve ports A and T, to com-
pressor Port SC-4.
Figure 21

RWB II ROTARY SCREW COMPRESSOR UNITS
OPERATION
S70-210 IOM
Page 19
Figure 22
COMPRESSOR OIL COOLING SYSTEMS
The RWB II unit can be equipped with one of several systems
for controlling the compressor oil temperature. They are single
or dual-port liquid injection, or thermosyphon and water-
cooled oil coolers. Each system is automatically controlled,
independent of compressor loading or unloading.
Oil cooling systems should maintain oil temperature within
the following ranges for R-717 and R-22:
Liquid Injection External*
Oil Cooling Oil Cooling
130 - 170°F 120 - 170°F
* Thermosyphon oil cooling (TSOC) or Water-cooled oil
cooling (WCOC).
SINGLE-PORT LIQUID INJECTION
The single-port liquid injection system is designed to permit
liquid refrigerant injection into one port on the compressor
at any given moment and operates as outlined.
Solenoid valve SV5 is energized by the microprocessor
when the temperature sensor, installed in the oil manifold,
exceeds the LICO set point. High pressure liquid refrigerant
is then supplied to the temperature control valve (TCV). The
temperature control valve is equalized to a constant back
pressure by the differential pressure control valve (PDCV).
The differential pressure control valve uses discharge gas
to maintain downstream pressure. The gas downstream of
the differential pressure control valve is bled off to the com-
pressor suction to ensure steady and constant operation of
the valve.
RWB II BOOSTER OR SWING DUTY
APPLICATION
Discharge gas from the high stage compressor is required
to assist the differential pressure control valve (PDCV) in
providing the temperature control valve (TCV) with a constant
back pressure.
A solenoid valve SV6 is installed before the differential
pressure control valve (PDCV) to prevent migration of high
pressure gas during shutdown. A Frick-installed timer limits
the high pressure gas to only thirty seconds duration, since
intermediate gas pressure and spring tension are sufficient to
maintain closure on unit shutdown. A metering valve is also
provided for use as a service valve and to allow discharge
gas flow regulation to prevent excessive force and resulting
closure “hammering”.
A field-installed 1/4 inch OD tubing connection is required
between the high stage compressor discharge piping line (or
receiver) and the check valve.
DUAL-PORT LIQUID INJECTION
The dual-port liquid injection system is designed to obtain
the most efficient compressor performance at high and low
compression ratios by permitting injection of liquid refrigerant
into one of two ports optimally located on the compressor.
This minimizes the performance penalty incurred with liquid
injection oil cooling.
The dual-port system contains all the components of the
single-port system with the addition of a double acting sole-
noid valve SV7 and operates as outlined.

RWB II ROTARY SCREW COMPRESSOR UNITS
OPERATION
S70-210 IOM
Page 20
Solenoid valve SV5 is energized by the microprocessor when
the temperature sensor, installed in the oil manifold, exceeds
the LICO set point. Liquid refrigerant is then passed through
the temperature control valve (TCV) to the double-acting so-
lenoid valve SV7. Depending on the compressor’s operating
volume ratio (Vi), the microprocessor will select the flow of
the liquid refrigerant to either compressor port SL-1 or SL-2,
whichever is more efficient.
When the compressor operates BELOW 3.5 Vi, compressor
port SL-1 supplies the liquid cooling. When the (Vi) rises
ABOVE 3.5 Vi, port SL-2 supplies the liquid cooling.
The temperature control valve is equalized to a constant back
pressure by the differential pressure control valve (PDCV).
Both the differential pressure control valve (PDCV) and
the double-acting solenoid valve SV7 use discharge gas to
maintain downstream pressure. The gas downstream of both
valves is bled off to the compressor suction to ensure steady
and constant operation of the valves.
LIQUID INJECTION ADJUSTMENT
PROCEDURE
Adjustments must be made to ensure the oil is at the proper
temperature. When the adjustments have been made cor-
rectly, the oil temperature, the discharge temperature and
the temperature of the oil in the separator should all be ap-
proximately the same. (Refer to P&I Diagram)
Carefully insert The bulb from the thermal expansion valve
( TXV ) into the well in the discharge pipe between the com-
pressor and the oil separator. Then open the valve to the oil
separator high pressure connection.
Next, open the refrigerant supply valve, remove the cap on
the pressure regulating valve (PCV ), and close the adjust-
ing valve.
For low temperature oil – 125° to 135°F
After the unit has been started, wait for the oil temperature to
reach 122°F. This is the preprogrammed temperature to open
the liquid feed solenoid in the liquid injection supply line.
Open the adjusting valve only until the needle on the gauge
begins to move a very small amount.
Next, adjust the pressure regulating valve to approximately
80 psig by turning the adjustment ring inside the top of the
valve with a 5/16" Allen wrench. Turn the wrench clockwise
to raise the oil temperature, and counterclockwise to lower
the oil temperature.
After the adjustment s been, made wait until the oil and
discharge temperatures have had a chance to stabilize
before readjusting. The end result should be between 135°
and 140°F.
For high temperature oil – 160° to 170°F
After the unit has been started, wait for the oil temperature to
reach 122°F. This is the preprogrammed temperature to open
the liquid feed solenoid in the liquid injection supply line.
Open the adjusting valve only until the needle on the gauge
begins to move a very small amount.
Next, adjust the pressure regulating valve to approximately
30 psig by turning the adjustment ring inside the top of the
valve with a 5/16” Allen wrench . Turn the wrench clockwise
to raise the oil temperature, and counter-clockwise to lower
the oil temperature. After the adjustment has been made
wait until the oil and discharge temperatures have had a
chance to stabilize before readjusting. The end result should
be between 160° and 170°F.
Liquid Injection Oil Cooling - Ammonia
To tell if the unit you are starting has a low or high temperature
liquid injection valve, look at the power head of the Thermal
Expansion Valve.
If the unit is using Ammonia as a refrigerant and is for low
temperature the Sporlan number on the power head should
be Y764 or Y830. Set the oil temperature for135°F.
If the unit is using Ammonia as a refrigerant and is for high
temperature the Sporlan number on the power head should
be Y1199 or Y1201. Set the oil temperature for 160°F.
Liquid Injection Oil Cooling - Halocarbon
To tell if the unit you are starting has a low or high temperature
liquid injection valve, look at the power head of the Thermal
Expansion Valve.
If the unit is using Halocarbon as a refrigerant and is for low
temperature, the Sporlan number on the power head should
be L3. Set the oil temperature for 135°F.
If the unit is using Halocarbon as a refrigerant and is for high
temperature, the Sporlan number on the power head should
be Y1200 or Y1202. Set the oil temperature for 160°F.
When the unit has high temperature liquid injection oil cool-
ing, set the oil temperature alarm for 170°F.
Set the oil temperature cutout for 180°F.
When the unit has low temperature liquid injection oil cool-
ing, set the oil temperature alarm and cutout at the default
values set in the microprocessor.