Joy TWISTAIR TA-020 Installation and maintenance instructions

OPERATOR’S MANUAL
and PARTS LIST
JOY”
TWISTAIR”
SCREW COMPRESSOR
MODELS
TA-020
TA-025
MC-2224
FORM NO. MC-2224

Joy Twistair@
Screw Compressor
\#gffW
OPERATOR’S MANUAL
AND
PARTS BOOK
20 and 25 HORSEPOWER
JOY MANUFACTURING COMPANY
AIR POWER DIVISION
Michigan City, Indiana 46360
PRICE $7.50
FoRM MC-2224 4-73 A/l PRINTED IN U.S.A.

JOY TWISTAIR SCREW COMPRESSOR
*
‘#w
FRONT VIEW

TABLE OF CONTENTS
General Description
Installation ,. ., ,,
Location ,,,
Electrical Connections ,.
Air Supply .,, ,,
Wiring Diagram ,. ...
Piping ... .,. ,,
Lubrication ,,. ,., ... .,,,, ,,,
Compressor Oil Specifications
Lubrication System ,.
Oil-Air Flow Schematic
Oil Sump ., .,.
Controls ,. .,.
Control Selection ... .,
Method of Control Operation
Drive
Compressor Operation ., ,.
Preparation for Initial Start-Up
Emergency Shut-Down .,
Restart after Power Failure ,... ,,. ,.
Periodic Maintenance Schedule ., ,.
Initial Oil Change ..........................................................
Cleaning Air Filter Element .................... . . ... .
Replacing Oil-Air Separator Element ................................. .. .
Replacing Oil Filter Element ,... . . . .,
Installing Oil Seal . ............... .......... ....,,,, ,.,,....,,,,.,,, ...,,,
Pressure Switch Adjustment ........................................... ..... .... .. . .
Testing High Air Temperature Switch ......... . . . .. . ...... .. .....
Trouble Shooting ............. ..... ........ .,......
Safety Precautions . .. . ............. . .
Parts Listirw ..- ~~~~~~~~~~~~-~~~~~~~~~~~~~~~~~~
~~~~~~~~~~~~~~~~~~~~~~~~
2
3
4
4
4
5
6
7
7
7
8
9
10
10
10
12
14
14
15
15
16
16
17
17
18
18
18
19
19
21
22
Compressor ‘Accessories ,., .......... ............ ....... ...... ........48-53
War;anty ... ... ..... . .. ... ............. . ............. .... .. 54
1

OPERATOR’S MANUAL
JOY
TWISTAIR COMPRESSOR
GENERAL DESCRIPTION
FIGURE 166-51
Housing (Stator)
The Joy Twistair Compres-
sor is apositive displacement,
flood lubricated, screw type
compressor that employs a
single stage of compression to
achieve the specified pressure
and capacity. The compressor
consists of ahousing (stator)
figure 1, two screws (rotors)
figure 2, bearings, bearing
housing and end covers. In
operation the male rotor, 1
figure 2, turns at its rated
speed, however, the female ro-
tor, 2figure 2, turns at only
two-thirds the speed of the
speed of the male rotor. This is
because the male rotor has 4lobes
while the female has 6.
Compression is obtained by
trapping air between the threads
or lobes of the iwo rotors. As the
rotors turn, the lobes mesh, reduc-
ing the volume in the pockets and
thus compressing the trapped air.
The compressed air is discharged
through the discharge port just as
it reaches discharge pressure.
The principle of screw type
compression is illustrated in fig-
ure 3.
FIGURE 266-52
Screws (Rotors)
1. Male. Rotor 2. Female Rotor
2

FIGURE 366-ss
Principle of Operation of Screw Typo Compressor
The Joy Twistair Compressors covered in this manual are rated
at 20 and’25 Horsepower. Other models of the Joy Twistair Com-
pressors are available in sizes ranging from 71A horsepower Up
through 300 horsepower.
The Twistair Compressors in this manual have capacities of
77.4 CFM for the 20 Horsepower unit and 95.2 CFM for the 25
Horsepower unit, and are rated at 100 PSIG service discharge pres-
sure. They are designed to deliver amaximum of 125 PSIG, and
are available either as base mounted or tank mounted units. The
tank mounted unit is mounted on a 120 gallon tank. Oversize tanks
are available as ol)tional equipment, refer to accessory section of
this manual for a;ailable sizes.
INSTALLATION
SAFETY vALVE
CAUTION: OblBASEMCUNTED UNITS NEVER INSTALL ASHUT+FF
VALVE IN THE LINE BETWEEN COMPRESSOR AND RECEIVER WITHOIJT ~
APOPSAFETY VALVEON THE COMME5S0R SIDE,
SHUT-OFF
vALVE
~/
i
I
E
FIGURE 46S-16
Typical installation
3

LOCATION
The Joy Twistair compressor is designed for indoor operation
in ambient temperature ranging from 50° F. to 105° F. In selecting
the location for the compressor it is important that there is an
ample supply of well circulated air. Do not set the unit with
the, oil cooler side closer than 12 inches from awall or other ob-
struction which would restrict the free flow of air through the
cooler. Agood circulation of air through the cooler is important.
In order to avoid excessive pressure loss through use of extended
pipe or hose lines, the compressor should be located as close as
possible to the point where the air is to be used.
CAUTION
IF CONTAMINATED AIR CONTAINING ACID,
PAINT OR CORROSIVE MATTER IS PRESENT,
THEN AN OUTSIDE SOURCE OF AIR MUST BE
PROVIDED FOR THE COMPRESSOR AIR INTAKE.
ELECTRICAL CONNECTIONS
Have electrical connections to the power source made by acom-
petent electrician in accordance with local codes. It is extremely
important that the wiring is accomplished to assure proper rotation
of the compressor as indicated by the direction of rotation arrow
on the discharge and bearing cap.
The electrical circuit must have the same characteristics and
voltage as indicated on the motor nameplate and as is called for in
the controllers and wiring diagram. See figure 5, Page 5.
UNIT MUST BE GROUNDED. Ground from ground connec-
tion on base to agood ground connection. Use #8 wire or larger.
AIR SUPPLY
Aclean air supply is desirable for the satisfactory operation of
your Joy Compressor. Intake air temperature should range from 50°
F. to 105° F. Where alternate sources of intake air are available,
select the source supplying the cleanest air. The standard air filter
with which the compressor is equipped is of sufficient size and
design to meet all normal operating conditions if serviced regularly,
in accordance with the service schedule given on Page 16.
NOTE
IF THE COMPRESSOR IS TO OPERATE IN AN AREA
WHERE CONSIDERABLE LINT, DUST, DIRT OR
4

-WIRING DIAGRAM WD -10913-
w
LI L2 L3
ICR 2CR
&M =kM &M
‘?” ‘$” ‘$’3
WHEN USING TRANSFORMER
CONNECT AS FOLLOWS:
VOLTAGE TERMINALS TRANSFORMER
20U HI -H2 SPECIAL
230 HI -H2 JOY SUPPLIED
460 HI -H3 JOY SUPPLIED
575 HI -H4 JOY SUPPLIED
NOMENCLATURE:
CR —CONTROL RELAY
APS—AIR PRESSURE SWITCH
ATS— HIGH AIR TEMPERATURE SWITCH
Isv —SOLENOID VALVE (UNLOADER)
2SV—SOLENOID VALVE (OIL STOP)
FU —FUSE
OL —OVERLOAD RELAY
Ss —SELECTOR SWITCH
M—MOTOR STARTER
I
COMPRESSOR MOTOR
TERMINALS
@-TB @-STARTER
xl
~CONTROL TRANSFORMER OR< LISTOMER’S 115VA SUPPLY —I
,----- —-—— —___ ____ ____
tCONTROI TRANSFORMER (WHEN ORDERED) 7
xl II
Ix3
Il! 0
I
I I
IH3
I
I
tL) I
l– —-–--0-—--—-- –_-___ :-–_J
STOP
ICR 4
4b4ib :CONST, 712
I511
APS *:.
x3
k}
M9Isv
FIGURE 5
Wiring Diagram 5

OTHER CONTAMINATES ARE PRESENT, IT IS SUG-
GESTED THAT AN AIR FILTER RECOMMENDED
FOR THE SPECIFIC ENVIRONMENT BE SUBSTI-
TUTED FOR THE STANDARD FILTER. AN ALTER-
NATE TO THE SPECIAL FILTER WOULD BE A
MORE FREQUENT MAINTENANCE SCHEDULE FOR
THE STANDARD FILTER. THE FREQUENCY FOR
THE MAINTENANCE OF THE STANDARD FILTER
MAY HAVE TO BE ESTABLISHED AFTER APER-
IOD OF USAGE.
PIPING FOR OUTSIDE SOURCE OF AIR
When an outside source of air is to be supplied, the following
rules
1.
2.
3.
4.
5.
6.
7.
8.
should be followed:
Protect intake from the weather, rain and snow.
Keep intake pipe away from steam, gas, or engine exhaust.
Vapors will be drawn into the compressor whether there is a
filter or not.
Take outside air from at least 6feet above ground or roof
level. This is to minimize picking up dirt and litter in the
intake.
If possible, locate the intake on the shady (usually north)
side of the building and, if possible, under an overhang, as
the air is cooler in these locations.
Install the intake pipe from the compressor outward. Make
the pipe the same size or larger than the compressor intake
opening. As arule of thumb, increase the pipe diameter 2
inches for every 15 feet of piping.
Support intake lines with hangers, clamps and floor columns
to keep weight of lines off compressor.
Intake piping should include asection of hose or flexible
tubing.
Interior of added inlet piping must be corrosion resistant.
DISCHARGE PIPING
As previously stated, the compressor should be located as closely
as possible to the point of compressed air usage. However, whatever
piping is used in the distribution system should be constructed to
offer aminimum amount of resistance to air flow between the
receiver and point of use. Long radius elbows and pipe of sufficient
size should be used. In no case should the piping be of smaller size
than the receiver discharge opening. ,
NOTE
IN CASES WHERE THE COMPRESSOR IS CONNECT-
ED IN THE SAME LINE AS ARECIPROCATING
COMPRESSOR, ASURGE VOLUME CHAMBER AND
ACHECK VALVE MUST BE INSTALLED IN THE
AIR LINE BETWEEN THE TWO COMPRESSORS.
6

THE CHECK VALVE SHOULD BE LOCATED BE.
TWEEN COMPRESSOR DISCHARGE AND SURGE
CHAMBER. THIS APPLIES ONLY TO BASE MOUNT-
ED UNITS. ON TANK MOUNTED UNITS THE RE-
CEIVER ACTS AS ASURGE CHAMBER.
LUBRICATION
The operating principle of the compressor is such that the pres-
sure circulated oil in the system serves three purposes:
1. Lubricates the rotating parts and bearings.
2. Serves as cooling agent for the compressed air to maintain
the discharge air temperature within 100° F. of ambient
temperature provided it is properly maintained.
3. Assures high efficiency and maximum air delivery by helping
to seal the running clearance in the screws.
COMPRESSOR OIL SPECIFICATIONS
Joy Twistair compressors under normal operating conditions
can use either a 10 weight premium heavy-duty motor oil or 10
weigth premium quality heavy-duty industrial type oil. However
under extremely humid operating conditions the 10 weight heavy-
duty industrial type oil is the preferred choice.
Viscosity of the oil should be 160 to 210 SSU at 100” F. and the
oil should contain rust and oxidation inhibitors and foam suppres-
sors. The flash point of the oil must be 4000F. minimum.
CAUTION
IF DIFFERENT BRANDS AND TYPES OF OIL ARE
MIXED THERE IS ADISTINCT POSSIBILITY THAT
SOME OF THE ADDITIVES OF ONE BRAND WILL
REACT WITH THE ADDITIVES OF THE OTHER
BRAND. FOR THIS REASON THE MIXING OF DIF-
FERENT BRANDS OF OIL MUST BE AVOIDED.
LUBRICATION SYSTEM
Cooled oil under pressure is directed from the oil cooler to the
compressor, where it serves as alubricant, cooling agent and seal.
As it passes through the compressor it mixes with the air being
compressed and discharges with the compressed air into the oil
sump, where nearly all the oil in the air drops out due to imping-
ement and velocity change. Most of the remaining additional traces
of oil are removed as the air passes through the special oil separ-
ator device. The oil thus separated returns to the sump, and the air
leaves the sump at the discharge opening. The hot filtered oil from
the sump returns through the air-cooled oil cooler for re-circulation
through the compressor completing the cycle.
The oil-air flow schematic figure 6, illustrates the circulation
of air and oil in the system,
7

m
mOIL
•1 ‘1’
❑AIR &OIL MIXTURE
IIN-LINE
PRESSURE
SWITCH
-. . . .
OIL COOLER
FIGURE 668-3
Oil-Air Flow Schematic

OIL SUMP ‘\
The oil sump contains all the oil required for the compressor
operation. Oil is added through the fill fitting, see figure 7.
CAUTION
DO NOT REMOVE PLUG
FROM OIL FILL FITTING
OR ATTEMPT TO ADD
OIL WHEN THE COM-
PRESSOR IS OPERATING
OR SUMP IS UNDER
PRESSURE. TO ASSURE
THAT THE COMPRESSOR
WILL NOT .AUTOMATIC!-
ALLY START, PUT SE-
LECTOR SWITCH ON
CONTROL CENTER IN
“OFF” POSITION AND
PULL MAIN DISCONNECT
SWITCH. SUMP PRES-
SURE IS AUTOMATICAL-
LY RELIEVED WHEN
COMPRESSOR IS STOP-
PED. TO INSURE NO
LEAKAGE BACK FROM
RECEIVER, ENTIRE SYS-
TEM CAN BE BLOWN
DOWN BY CLOSING SER.
VICE LINE VALVE AND
THEN OPENING RECEIV-
ER DRAIN VALVE.
NOTE
ALLOW 5MINUTES FOR
COMPLETE REPRESSUR-
IZATION OF THE SYS.
TEM.
AIR-O
INLE
m
❑
mmm
‘lR6OIL ‘w--J
To 611
FILTER
FIGURE 76s-4
Cross Section Oil Sump and
Air-Oil Separator
OIL SUMP
20 Horsepower
25 Horsepower
CAPACITIES
unit 41/2 Gallons
unit 53/4Gallons

CONTROLS
The Joy Twistair Compressor has aDual Control System. This
system provides for Automatic Start and Stop operation or Constant
Speed operation. Aselector switch mounted on the top of the Con-
trol Center is provided so that the operator can select the type of
operation required.
CONTROL SELECTION
The method of control may be selected by placing the selector
switch on the Control Center to the desired position.
The center position (toggle up) is the switch “off” position.
The left position (toggle left) marked “Const” is the constant
speed position. In this position the compressor will continue com-
pressing air until it reaches the pressure switch setting at which
time it “unloads” (stops compressing air) but continues running at
reduced power. When the pressure in the receiver drops to the low
point pressure switch setting (100 PSIG with standard pressure
switch and factory setting) the compressor starts compressing air
and continues until the air pressure in the receiver again reaches
the high limit setting. (120 PSIG)
The right position (toggle right) marked “Auto” is the auto-
matic position (start-stop control). In this position the compressor
will continue compressing air until it reaches the pressure switch
setting at which time the compressor stops. Caution should be
exercised when machine is not running since it might start with-
out warning when switch is in this position. The compressor will
remain off until the receiver drops to the low point pressure switch
setting at which time the compressor will start again and continue
running until it reaches the high limit of the pressure switch setting.
NOTE
IF OPERATING CONDITIONS ARE SUCH THAT
THE INTERVALS OF MOTOR STARTS ARE MORE
THAN FOUR TIMES AN HOUR, THEN THE SELEC-
TOR SWITCH SHOULD BE MOVED TO CONSTANT
SPEED POSITION.
METHOD OF CONTROL OPERATION
A. The following Components make up the control system:
1. Pressure switch—adjustable means of controlling high and
low limits of pressure in air receiver. Normally closed.
2. Inlet valve operator— (A solenoid operated valve) directs
receiver air to and from the inlet valve.
3. Compressor inlet valve.
10

4. Vent valve—an integral part of the inlet wilve vents air pres-
sure in sump. Normally closed.
5. Oil stop valve—Solenoid operated valve prevents oil from
entering compressor when stopped. Normally closed (de-ener-
gized).
6. High Discharge Air Temperature Switch—protects unit
against high discharge air temperature—adjustable.
B. When selector switch is moved to “Const” (constant speed):
1. Compressor starts to run.
2. Inlet valve opens.
3. Vent valve closes.
4. Oil stop valve opens.
Compressor reaches max. set receiver pressure, unloads and con-
tinues running (not compressing). At unload, the following happens:
1. Inlet valve closes preventing air from entering.
2. Vent valve opens— vents sump pressure through the inlet
valve.
3. Oil stop valve remains open supplying unloaded compressor
with lubricating oil.
When receiver drops to preset minimum pressure:
1. Inlet valve opens starting compression.
2. Vent valve closes.
When compressor is stopped:
1. Inlet valve closes.
2. Vent valve opens venting sump,
3. Oil stop valve closes preventing oil from entering compressor.
C. When selector switch is moved to “Auto” (automatic):
1. Compressor starts to run,
2. Inlet valve opens.
3. Vent valve closes.
4. Oil stop valve opens,
When compressor reaches maximum set receiver pressure the
motor stops and :
1. Inlet valve closes.
2. Vent valve opens.
3. Oil stop valve closes.
When receiver pressure drops to preset minimum:
1. Motor starts.
2. Inlet valve opens.
3. Vent valve closes.
4. Oil stop valve opens.
11

DRIVE
The Joy Twistair Compressor drive is equipped with Dodge
Dyna-V belts. Because of their high horsepower rating, they must
be operated at higher tensions than A, B~ C, Dand Ebelts. However!
due to the flexibility of the small cross section, they may not feel
as tight as would be expected for the tension theycarry.Refer to
procedure and the table on page 13 following for proper tensioning.
Proper V-belt tension and sheave alignment is ex;remely im-
portant to belt life, bearing life and power transmission. Correct
tensioning and alignment was provided at time of shipment from
the factory, however it is recommended that sheave alignment and
V-belt tensioning be checked before initial start up. Belt tension
should be checked several times during first 50 hours of operation
and periodically thereafter.
Replacing V-Belts
To replace’the drive V-belts,
first loosen motor hold-down
bolts (l). Then loosen locknut
(3) and adjustment screws (2)
figure 8. Slide the motor to-
ward the compressor to pro-
vide sufficient slack for belt
removal and replacement. Ten-
sion belts by using moto~ ad-
justment screws (2). Check
sheave alignment, adjust as
necessary and then tighten
hold down bolts (1) securely.
Belt Tensioning Procedure
I
FIGURE 866-57
V-Belt Removal and Tensioning
1.
2.
3.
4.
12
Place the belts in the sheave grooves and adjust motor adjust-
ment screws, (z) figure 8, until belts are seated. Pull drive
through by hand to equalize tension.
Measure the span length K, see figure 9.
Apply the force (perpendicular to span at center of the span)
required to deflect the belt 1/64” per inch of span length (K).
See figure 9. The force can be applied by means of asimple
spring scale.
Compare the force required with the values
page 13. The force required should be within
maximum values shown.
given in Table I,
the minimum and

NOTE
ANEW SET OF BELTS SHOULD BE INITIALLY
TENSIONED 1/3 GREATER THAN THE MAXIMUM
VALUES SHOWN. SEE TABLE IBELOW.
5. Recheck tension of new belts two or three times in the first 50
hours of operation and adjust if necessary.
FIGURE 968-5
Measuring Forces
Table I
Belt Tension Forces
IInitial Normal
H.P. iDeflection Tensioning FORCE LBS.
Inches Force LBS. Min. ;Max.
20 17/64 84-1/4 6
25 ,9/32 84-1/4 6
13

Tension Testing Tool
Atension testing tool is available. This tool facilitates checking
belt tensions. Scales are provided on the tool for reading both the
required force and the distance of belt deflections which are used
in properly tensioning belts as described above. Order by part
number 543217.
Sheave Alignment
To align the sheaves, place along steel straight edge across the
rims of both sheaves. Always align the motor sheave to the com-
pressor sheave. The straight edge must be flat across the compressor
sheave. Horizontal alignment is determined by placing the straight
edge close to the sheave’s center. Swing the straight edge to the top
and bottom of the motor sheave to determine vertical alignment.
COMPRESSOR OPERATION
Every Joy Compressor is operated and thoroughly tested at the
factory before shipment. The test assures that the compressor will
deliver its rated capacity and is in good working order. However,
regardless of the care taken at the factory, there is the possibil-
ity that damage may occur in shipment. For this reason, it is recom-
mended that the unit be carefully inspected for evidence of possible
damage in shipment. During the first few hours of operation the
machine should be observed for any possible malfunction.
CAUTION
DO NOT SET AIR PRESSURE SWITCH TO ALLOW
THE COMPRESSOR TO RUN IN EXCESS OF 125 PSI.
PREPARATION FOR INITIAL START-UP
1. Put selector switch located on control center in “off” position
and pull main disconnect switch to assure that no power is
going to the unit.
NOTE
THE STANDARD MACHINE UTILIZES TWO VOL-
TAGE SOURCES OF POWER FOR OPERATION:
1. 115 VOLTS FOR CONTROL.
2. 230 or 460 VOLTS FOR MOTOR.
AN INTER-LOCK BETWEEN THE TWO CIRCUITS IS
PROVIDED AS STANDARD EQUIPMENT.
CAUTION :DO NOT RUN 230 VOLT MOTOR ON 208 VOLTS
(208 or 575 VOLT MOTORS ARE AVAILABLE AS OPTIONAL
EQUIPMENT).
\
14

2. Inspect unit and assembly for any visible signs of d;mage hat
could have occured in shipment or during installation.
3. Fill sump to center line of fill fitting with oil as specified in
Oil Specifications Page 8. If sump is over-filled, drain to
proper level.
NOTE
TIGHTEN FILL FITTING PLUG SECURELY.
REMEMBER THIS IS APRESSURIZED VESSEL.
4. Reconnect main disconnect switch.
CAUTION
JOG COMPRESSOR ‘TO CHECK FOR PROPER DIREC.
TION OF ROTATION AS INDICATED BY DIREC-
TION ARROW ON DISCHARGE END BEARING CAP.
IF DIRECTION OF ROTATION IS WRONG, COR-
RECT BY RE-CONNECTING THE MOTOR LEADS
TO OBTAIN PROPER ROTATION DIRECTION.
5. Close receiver discharge valve and move selector switch to
desired operating position. Constant speed setting is recom-
mended for initial start-up.
6, With receiver discharge valve closed, let machine pump Up
to operating pl essure; at this stage the automatic controls
will take over.
7. Open receiver discharge valve.
8. After unit has run for several minutes, shut it down and
check oil level. It may be necessary to add oil to compensate
for the amount of oil needed to fill the entire system.
NOTE
NO BREAK-IN PERIOD IS REQUIRED. THE MA-
CHINE CAN BE PUT IN FULL OPERATION IM-
MEDIATELY.
EMERGENCY SHUT-DOWN
To manually shut down the compressor in case of an emergency,
put selector switch located on electrical Control Center to “off”
position.
RESTART AFTER POWER FAILURE
If unit shuts down due to power failure, first check for blown
fuse then restart by resetting starter button.
15

Initial Oil Change
During machine assembly there are acertain amount of im-
purities that, regardless of the care taken to prevent their entrance,
are in the machine. In the initial hours of operation these impuri-
ties are flushed out and are caught in the oil filter. Because of this,
it is recommended that the oil and oil filter element be changed
after the first 300-400 hours of operation. Thereafter, the oil and
oil filter element change interval should be in accordance with
the following Periodic Maintenance Schedule.
PERIODIC MAINTENANCE SCHEDULE
In order to obtain continued satisfactory performance, the fol-
lowing maintenance schedule should be observed. As with all ma-
chinery, aproperly maintained maintenance schedule must be
followed.
NOTE
THE FOLLOWING SCHEDULE IS BASED UPON
NORMAL OPERATING CONDITIONS. IN AREAS OF
UNUSUAL ENVIRONMENT, THE MAINTENANCE
SCHEDULE SHOULD BE ADJUSTED TO ALLOW
FOR EXISTING CONDITIONS.
CAUTION
BEFORE ATTEMPTING ANY OF THE FOLLOWING,
BE SURE TO PULL MAIN DISCONNECT SWITCH
TO ASSURE THAT NO POWER IS GOING TO THE
UNIT.
Daily:
1. Drain condensate from receiver.
2. Read the separator differential indicator to observe the condi-
tion of the air-oil separator element. The amount of red show-
ing indicates the degree of restriction across the oil-air
separator. When indicator shows all red, the separator ele-
ment should be changed.
3. Observe the oil return line sight glass to determine if oil is
flowing. Alight air-oil mist is normal.
Weekly:
1.
2.
16
Through bulls-eye sight glass in oil fill elbow check sump
oil level, add oil as required. Check only when unit is warm.
If compressor has not been in operation, run for several
minutes to warm up. When adding oil do not mix different
types and brands of oil.
Check pressure switch adjustment by observing receiver pre>-
sure gauge. Adjust if necessary.

Each 30 Days:
1. Clean accumulated dust and lint from oil cooler fins.
2. Clean and service. air cleaner. If element is damaged, replace.
3. Test air temperature switch. It should shut down the unit at
discharge air temperature of 200’ F. See page 19 for test
procedure. NOTE
THESE TWO STEPS MUST BE PERFORMED MORE
FREQUENTLY IF COMPRESSOR IS OPERATINCj IN
AN ENVIRONMENT THAT HAS AN EXTREMELY
LARGE AMOUNT OF DIRT OR LINT PREVAILING.
Twice Yearly or Every 1000 Hours:
Whichever comes first :
1. Change oil in sump.
2. Change oil filter element.
3. Check oil-air separator element and change if damaged or
extremely dirty.
4. Remove and inspect drive bearing lube line strainer element.
Clean by blowing out with areverse flow of air. If damaged
or badly contaminated, replace with new element,
5. Remove and inspect oil return line strainer element. Clean by
blowing out with reverse flow of air. If damaged or badly
contaminated replace with new element.
Motor Lubrication
Grease lubricated motors are properly lubricated at the time of
manufacture and it is not necessary to re-lubricate prior to initial
start-up. However, if motor has not been run for aperiod of 6
months or longer, it is recommended that it be lubricated before
starting.
For the type of lubricant to use and the method of lubrication
contact local motor manufacturer’s representative. See motor name-
plate for motor identification.
CLEANING AIR FILTER ELEMENT
Wash filter element in warm water solution of household deter-
gent. Do not oil or clean with gasoline, kerosene, or any other
volatile liquid.
REPLACING CNL-AIR SEPARATOR ELEMENT
1. Disconnect vent line, oil return line and discharge line from
sump.
2, Remove head from sump.
3. Lift off gaskets and lift out oil-air separator element,
4. Instail new oil-air separator element and new gaskets.