Standex Master-Bilt B-SERIES User manual

5/16 Rev. B 57-02497
Condensing Unit and
Refrigeration System
Installation & Operations Manual
908 Highway 15 North
New Albany, MS 38652
Phone: [phone]
Fax: [phone]
www.master-bilt.com
©2015 Master-Bilt Products, an unincorporated division of Standex International Corporation.
ll rights reserved.

5/16 Rev. B 57-02497 2
TABLE OF CONTENTS
INTRODUCTION.....................................................................................................................................3
WARNING LABELS AND SAFETY INSTRUCTIONS.......................................................................
B-SERIES CONDENSING UNIT FEATURES......................................................................................5
M-SERIES CONDENSING UNIT FEATURES…….............................................................................6
MASTER-BILT REFRIGERATION NOMENCLATURE..................................................................7
PRE-INSTALLATION.............................................................................................................................8
INSTRUCTIONS.......................................................................................................................................8
General Information……........................................................................................................................8
Delivery In pection…............................................................................................................................8
INSTALLATION INSTRUCTIONS.......................................................................................................8
Handling and Placement of Conden ing Unit........................................................................................8
Handling and Placement of Evaporator Coil in Walk-In .......................................................................9
Evaporator and Drain line in tallation In truction …………......…………………………………9-10
Electrical…………...............................................................................................................................11
Refrigerant Piping…………….............................................................................................................11
Leak Check...........................................................................................................................................12
Evacuation, Dehydration and Start-Up…………….............................................................................12
Evacuation Procedure...........................................................................................................................12
Fini h Charging Procedure …………………......................................................................................13
Preliminary............................................................................................................................................13
Remote "M-Serie ".………………………..........................................................................................13
Built-Up Remote "B-Serie " Conden ing Unit ...................................................................................13
Pre-Charged Remote Refrigeration Sy tem ...................................................................................14-15
Final Check Li t for All Model ...........................................................................................................16
R- 0 A SUCTION AND LIQUID LINE SIZES ............................................................................17-18
EQUIVALENT LENGTH ALLOWANCE FOR FITTINGS.............................................................19
LOW AMBIENT OPERATION CHARGE ...................................................................................20-21
CONDENSING UNIT SPECIFICATIONS.....................................................................................22-39
UNIT BASE SPECIFICATIONS ..................................................................................................... 0- 2
SALE AND DISPOSAL.......................................................................................................................... 3
INSTALLATION DATA........................................................................................................................

5/16 Rev. B 57-02497 3
INTRODUCTION
Thank you for purcha ing Ma ter-Bilt
®
refrigeration equipment. Thi manual contain important
in truction for in tallation, u e and ervice. Read all of thi manual carefully before in talling or
ervicing your Ma ter-Bilt
®
refrigeration equipment.
NOTICE Installation and service of the refrigeration and electrical components must be
performed by a refrigeration mechanic or licensed electrician.
The portion of thi manual covering refrigeration and electrical component contain technical in truction intended only for
per on qualified to perform refrigeration and electrical work.
DANGER
Equipment MUST be properly grounded.
Improper or faulty hook-up of electrical components of the refrigeration units can result in severe
injury or death.
All electrical wiring hook-ups must be done in accordance with all applicable local, regional or
national standards.
NOTICE Read this manual before installing your refrigeration. Keep the manual and refer
to it before doing any service. Failure to do so could result in personal injury or equipment
damage.
Thi manual cannot cover every in tallation, u e or ervice ituation. If you need additional information,
contact u at:
Parts and Technical Service Department
Master-Bilt Products
908 highway 15 North
New Albany, MS 38652
Phone: [phone]
Fax: [phone]
E-Mail: [email protected]m

5/16 Rev. B 57-02497 4
WARNING LABELS AND SAFETY INSTRUCTIONS
Thi i the afety-alert ymbol. When you ee thi ymbol, be alert to the potential for
per onal injury or damage to your equipment.
Be ure you under tand all afety me age and alway follow recommended precaution
and afe operating practice .
NOTICE TO EMPLOYERS
You must ma e sure that everyone who installs, uses or services your refrigeration is
thoroughly familiar with all safety information and procedures.
Important afety information i pre ented in thi ection and throughout the manual. The following
ignal word are u ed in the warning and afety me age .
DANGER: Severe injury or death WILL occur if you ignore the me age.
WARNING: Severe injury or death CAN occur if you ignore the me age.
CAUTION: Minor injury or damage to your refrigeration can occur if you ignore the me age.
NOTICE: Thi i important in tallation, operation or ervice information. If you ignore the
me age, you may damage your refrigeration.
The warning and safety labels shown throughout this manual are placed on your Master-Bilt
®
refrigeration at the factory. Follow all warning label instructions. If any warning or safety labels
become lost or damaged, call our parts and technical service department at 800-684-8988 for
replacements.
This label is located on the condensing unit.

5/16 Rev. B 57-02497 5
B-SERIES CONDENSING UNIT FEATURES
STANDARD COMPONENTS
The B-Series units offer the most complete set of standard features (pre-wired and mounted except as noted)*
The e include:
● Liquid line and uction line vibration ab orber (eliminator ) for emi-hermetic unit only.
● Adju table dual pre ure control
● Head pre ure control (flooding valve)
● Corro ion-re i tant hinged weather hood with lockable nap-down hood latch for ea y in tallation and
ervice acce
● Suction line filter
● Heavy-duty 12 gauge galvanized teel leg
● Pre-wired electrical control panel with timer and circuit breaker or fu e block
● Crankca e heater
● Liquid line filter/drier
● Sight gla
● Liquid and uction line kit with ervice valve
● Liquid line olenoid valve ( hipped loo e)
● Timer
● Generou ly- ized conden er (for 105° to 110° ambient)
● Large liquid receiver (good for maximum 250 ft. line run)
● Defro t heater contactor when required
● Compre or contactor u ed in 1
1
/2 HP unit and up
● PSC fan motor
● One year limited compre or warranty
*Components may vary depending on horsepower and application. Consult our factory for verification of
standard and optional components.
OPTIONALLY AVAILABLE
● Water-cooled unit
● Special voltage
● Oil eparator
● Conden ing unit above 40 H.P.
● In ulated and heated receiver (thermo tatically controlled)
● Suction accumulator ( hipped loo e)
● Coated conden er coil
● Pha e lo /low voltage monitor
● Factory pre-a embled evaporator coil (include factory pre-mounting of thermo tatic air control and
expan ion valve)
● Pre-mounted olenoid at evaporator
● Extended four year limited compre or warranty
● Ma ter Controller electronic control y tem
● Rever e cycle defro t

5/16 Rev. B 57-02497 6
M-SERIES CONDENSING UNIT FEATURES
STANDARD COMPONENTS
The M-Series set of standard features (pre-wired and mounted except as noted)* include:
● Liquid line and uction line vibration ab orber (eliminator ) for emi-hermetic unit only
● Pre et non-adju table high pre ure control and pre et non-adju table low pre ure control**
● Crankca e heater
● Head pre ure control (flooding valve)
● Heavy gauge, galvanized teel mechanically-fa tened weather hood
● Suction ervice valve
● Heavy-duty angle leg ba e
● Liquid line filter/drier
● Pre-wired electrical control panel
● Sight gla
● Liquid and uction line kit with ervice valve
● Timer ( tandard on low temp unit only)
● Compre or contactor
● Defro t heater contactor (when required)
● Generou ly- ized conden er (rated up to 120° ambient)
● Rifled tube in conden er for greater efficiency
● Liquid line hut-off valve for ea y change of filter
● PSC conden er fan motor
● Large liquid receiver (good for maximum 100 ft. line run)
● One year limited compre or warranty
*Components may vary depending on horsepower and application. Consult our factory for verification of
standard and optional components.
**Preset high pressure control and preset low pressure control are non-adjustable in medium temp M-Series
units. The low pressure control is adjustable in low temp units.
OPTIONALLY AVAILABLE
● Special voltage
● In ulated and heated receiver (thermo tatically controlled)
● Suction accumulator
● Coated conden er coil
● Oil eparator
● Pha e lo /low voltage monitor
● Factory pre-a embled evaporator coil (include factory pre-mounting of thermo tatic air control and
expan ion valve)
● Factory pre-charged y tem with quick connect liquid and uction line et up to 40 ft. ( pecify length
when ordering)
● Adju table low pre ure control for medium and high temp unit
● Dual pre ure control
● Circuit breaker
● Suction filter
● Fan cycling witch
● Pre-mounted olenoid at evaporator
● Liquid line olenoid valve ( hipped loo e)
● Timer for medium temp unit
● Extended four year limited compre or warranty
● Ma ter Controller electronic control y tem
● Rever e cycle defro t

5/16 Rev. B 57-02497 7
MASTER-BILT® REFRIGERATION NOMENCLATURE
MODEL NUMBER EXPLANATION (CONVENTIONAL = ACCESSIBLE HERMETIC)
BC = Built-up Remote Conventional Conden ing Unit MH = Hermetic Conden ing Unit
BH = Built-up Remote Hermetic Conden ing Unit MS = Scroll Conden ing Unit
BS = Built-up Remote Scroll Conden ing Unit MD = Di cu Conden ing Unit
MC = Conventional Conden ing Unit
ROOM TEMPERATURE EXPLANATION
H = +35° Thru +70° F. Room Temperature L = 0° F. Thru -20° F. Room Temperature
M = +25° Thru +34° F. Room Temperature
HORSEPOWER RATING EXPLANATION (NOTE: APPLIES TO B-SERIES ONLY)
005 = ½ H.P. 017 = 1¾ H.P. 030 = 3 H.P. 075 = 7½ H.P. 150 = 15 H.P. 270 = 27 H.P. 007 = ¾ H.P.
020 = 2 H.P. 040 = 4 H.P. 090 = 9 H.P. 200 = 20 H.P. 300 = 30 H.P. 010 = 1 H.P. 025 = 2½ H.P.
050 = 5 H.P. 100 = 10 H.P. 220 = 22 H.P. 350 = 35 H.P. 015 = 1½ H.P. 028 = 3 H.P. 060 = 6 H.P.
120 = 12 H.P. 250 = 25 H.P. 400 = 40 H.P.
BTU/HR RATING EXPLANATION (NOTE: APPLIES TO M-SERIES ONLY)
Room temp H = Nominal BTUH capacity @ +30° uction, 90° ambient (1000 multiplier)
Room temp M = Nominal BTUH capacity @ +20° uction, 90° ambient (1000 multiplier)
Room temp L = Nominal BTUH capacity @-20° uction, 90° ambient (1000 multiplier)
EQUIPMENT VARIATION EXPLANATION
0 = Standard W = Water Cooled
A = Pla ma Unit X = Special Application
D = Demand Cooling Y = Special Application
L = Large Conden er
VOLTAGE EXPLANATION
A = 115/60/1 F = 200-220/50/3
B = 230/60/1 or 208-230/60/1 (A Applicable) G = 380-420/50/3
C = 208-230/60/3 H = 208/60/1
D = 460/60/1 J = 380/50/1
E = 460/60/3 K = 200-220/50/1 or 220/50/1
OPTIONS EXPLANATION (NOTE: APPLIES TO B-SERIES ONLY)
C = Coated Conden er Coil
D = Coated Conden er Coil, Heated and In ulated Receiver
L = Large Conden er

5/16 Rev. B 57-02497 8
PRE-INSTALLATION INSTRUCTIONS
I. General Information
Plea e read thi manual prior to in talling your Ma ter-Bilt
®
equipment. Thi information i ba ed on
good refrigeration practice and hould be u ed a a guide for in tallation and operation.
To complete the in tallation, plea e record the data reque ted on the In tallation Data form on page 35
of the manual and return thi manual to the owner.
II. Delivery Inspection
You are re pon ible for filing all freight claim with the delivering truck line. In pect all carton and
crate for damage a oon a they arrive. If damage i noted to hipping crate , carton or if a hortage i
found; note thi on the bill of lading (all copie ) prior to igning.
If damage i di covered when the cabinet i uncrated, immediately call the delivering truck line and
follow up the call with a written report indicating concealed damage to your hipment. A k for an
immediate in pection of your concealed damage item. Crating material MUST be retained to how the
in pector from the truck line.
INSTALLATION INSTRUCTIONS
I. Handling and Placement of Condensing Unit
To minimize damage to the unit hou ing, it i recommended that the crate not be removed until the unit
i moved to it final location.
The following hould be con idered when placing the unit:
A. The conden er coil (air inlet) hould not be located o a to re trict air flow into the coil. A
minimum of 12" i required (18" i preferred) between the face of the coil and a wall or other
vertical ob truction.
B. A minimum of 6" i required on the ide to allow acce to the hou ing clamp .
C. A minimum of 24" i required on the louvered end ( air outlet) for clearance when opening
hou ing and for ea e of maintenance.
D. Do not po ition multiple unit o that the air di charge of one i into the conden er air intake of
another.
Hole are provided in the ba e upport for mounting bolt and for bridle lift rod .
For indoor mounting, motor room hould be provided with fan de igned to move 1000 cfm of air per
ton of refrigeration.

5/16 Rev. B 57-02497 9
II. Handling and Placement of Evaporator Coil in Walk-In
To minimize damage to the evaporator coil, it i recommended that the carton (or crate) not be removed
until the evaporator coil i moved clo e to it final location. When the container i removed from the
evaporator coil, extreme care mu t be u ed when lifting and mounting to the ceiling, to prevent heet
metal damage.
EVAPORATOR INSTALLATION INSTRUCTIONS
A. Do not in tall the evaporator too clo e to door opening to prevent icing problem .
B. Minimum clearance between evaporator and the wall i equal to or greater than the coil height
for proper air flow and ervice acce .
C. Refer to the evaporator coil drawing dimen ion for mounting hole location.
D. In tall wa her and ecure with nut . Tighten until the coil i firm again t the ceiling. The
evaporator coil mu t be level.

5/16 Rev. B 57-02497 10
EVAPORATOR DRAIN LINE INSTALLATION:
a. Copper lines must be used for drains. Plastics are not
acceptable.
b. Drain lines must exit the freezer or cooler as quickly as
possible and must have a pitch of at least 1/8” inch/foot
do n ard or meet the local code requirements.
c. Drain lines must have individual traps for the cooler and
the freezer and the trap cannot be inside the freezer.
Freezer/Cooler Combo Drain line:

5/16 Rev. B 57-02497 11
III. Electrical
Electric power upply mu t match the conden ing unit power requirement indicated on the unit data
plate. A WIRING DIAGRAM IS LOCATED ON THE INSIDE OF THE ELECTRICAL BOX
COVER. All field wiring may enter the hole provided in left ide, back and bottom of the electrical
box. All field wiring hould be done in a profe ional manner, in accordance with all governing code .
Double check all wiring connection , including factory terminal , before tart-up of conden ing unit.
DANGER
In tallation of the refrigeration and electrical component mu t be performed only by a refrigeration
mechanic or licen ed electrician.
Improper or faulty hook-up of electrical components can result in death.
IV. Refrigerant Piping
The conden ing unit mu t remain ealed and pre urized from the manufacturer until piping i complete and final
connection are ready to be made.
U e only refrigeration grade copper tubing, (ACR), type "L", bright annealed, dehydrated, and properly
ealed again t contamination. Soft temper tubing may not be u ed for field interconnection of
refrigeration component (conden ing unit to evaporator a embly). Take extreme care to keep
refrigeration tubing clean and dry prior to in tallation. U e an appropriate ize tube cutter (DO NOT
CUT TUBING WITH A SAW).
Note: The liquid line ize i determined by conventional piping practice for air and electric defro t (u e
chart on page 15-16). For rever e cycle defro t, the liquid line mu t be elected by choo ing the liquid
line one nominal step larger than the conventional approach. For example: for an evaporating
temperature = -20ºF, refrigerant R-404A, and a capacity of 20,000 Btuh, the conventional table will
ugge t a liquid line ize of ½” OD. When utilizing the rever e cycle feature of the Ma ter Controller,
the liquid line ize hould be 5/8” OD. When utilizing the electric or air defro t cheme, there i no need
to make the line larger.
Suction line hould lope down 1/2 inch for each 10 feet of horizontal run toward the compre or.
If any portion of the uction line ri e above the exit elevation of the evaporator, P-type oil trap hould be located
at the ba e of each uction ri er for proper oil return to the compre or.
When brazing, dry nitrogen MUST be pa ed through the line at low pre ure to prevent caling and oxidation
in ide the tubing and fitting . All flux mu t be removed from the joint after brazing.
MINIMIZE the amount of flux u ed to prevent internal contamination of the refrigeration y tem.
Silver brazing wire i to be utilized (high temperature alloy of 15% ilver content on all copper to copper
connection , and high temperature alloy of 45% ilver content on all di imilar metal connection ).

5/16 Rev. B 57-02497 12
NOTICE
Be sure solenoid valves are open before beginning evacuation and leak check.
v. Leak Check
When all refrigeration line connection have been made, the complete y tem, including factory connection ,
hould be leak checked.
Add the proper refrigerant to 60 p ig, then boo t to 175 p ig with dry nitrogen. Leak check all joint with an
electronic leak detector or a halide torch. If leak are found, relieve the pre ure and make repair a nece ary
and recheck.
VI. Evacuation, Dehydration and Start-Up
A vacuum of 500 micron or le mu t be pulled to properly dehydrate the y tem. Thi require a two- tage
vacuum pump with an electronic vacuum indicator.
DO NOT USE THE SYSTEM COMPRESSOR AS A VACUUM PUMP.
DO NOT OPERATE COMPRESSOR WHILE SYSTEM IS IN A VACUUM.
EVACUATION PROCEDURE
A. Open all conden ing unit ervice valve and relieve y tem pre ure. Al o, open any line valve in talled
in the y tem and energize all olenoid valve to facilitate evacuation.
B. Connect the vacuum pump to the high and low ide of the y tem u ing 1/4" or larger cop per line or
1/4" ID ho e with high vacuum de ignation.
C. Leak or moi ture will be indicated if the y tem pre ure ri e when the vacuum line i clo ed off.
D. Pull a vacuum of 1500 micron , clo e vacuum line and “break” vacuum to 3 p ig, maximum, with
refrigerant to be u ed in the y tem.
E. Repeat tep D.
F. A final vacuum of 250 micron hould be pulled before charging. When 250 micron i reached, clo e
vacuum line and charge through high ide, with proper refrigerant to the level of 2-1/2 lb . per ton of
refrigeration.

5/16 Rev. B 57-02497 13
FINISH CHARGING PROCEDURES
A. Preliminary
1. Be ure all ervice valve are “open”.
2. Loo e the compre or hold-down bolt and remove hipping clip to allow compre or to float freely
on the pring .
3. Check evaporator fan motor after tart-up. Medium temperature, air defro t fan run continuou ly.
Low temperature fan and cooler provided with electric defro t will be delayed by the fan control.
4. Start the y tem by “flipping on” the circuit breaker in the unit electric box.
5. Start charging per (B), (C), (D) or (E) on the following page .
CAUTION: Never add liquid refrigerant to the uction ide of the compre or.
6. Check operating pre ure while charging and on initial pull down to prevent damage if a
problem occur . If y tem “flood ” back to the compre or, adju t the thermo tatic expan ion
valve a required for proper operation. There hould be at lea t +30°F uperheat entering the
compre or.
7. Ob erve compre or amperage draw and compare to compre or nameplate to prevent damage
due to high amperage. The oil ight gla hould be between 1/2 and 3/4 full during normal
operation
B. Remote "M-Serie " Conden ing Unit
1. For models without head pressure control valve: With the y tem operating, add refrigerant
until the ight gla indicate a full charge, then add one pound for each 2 rated hor epower of
the conden ing unit when charging above +75°F. If ambient i below +75°F, add 1/2 to the
above.
2. For models with head pressure control valve: Add additional charge per the procedure.
C. Built-Up Remote "B-Serie " Conden ing Unit
The e unit are equipped with a head pre ure control valve for low ambient operation. Thi valve
will flood the conden er when ambient temperature are low, requiring additional refrigerant to
provide correct operation under variou ambient condition . See attached Chart B and C (page 19
and 20) for the additional charge data, and fini h charging a follow .
1. Add the proper refrigerant for a full ight gla .
2. Add additional charge per the procedure on page 19.
DANGER
Charging of the refrigeration system must be performed only by a certified refrigeration
mechanic. Improper or faulty hook-up of refrigeration electrical components can result in injury
or death.

5/16 Rev. B 57-02497 14
Technical in tallation in truction for Pre-Charged Remote Refrigeration are given on the
following page . In tallation requirement for other remote refrigeration y tem may vary. If
additional information i needed, your certified refrigeration mechanic or electrician can call
Ma ter-Bilt at 800-684-8988.
Quick-Couple are pre-charged with the proper refrigerant at the factory.
D. Pre-Charged Remote Refrigeration Sy tem .
● Place a teel or treated-wood preader on the top of the walk-in
to di tribute the load of the coil. The preader mu t be at lea t
twice the width of the coil. The coil mu t be mounted away
from the edge of the roof a di tance equal to the height of the
coil (See Figure #1).
● Uncrate the coil and through-bolt it to the ceiling of the walk-
in with uitable fa tener .
igure #1 Quick-Couple Remote Refrigeration
● Uncrate the conden ing unit and locate near coil. Be ure air movement around the unit i not re tricted
o the conden ing unit will have a ufficient upply of air to function properly.
NOTE: Install evaporator coil in accordance with the manufacturer's recommendations from
inside wall or obstructions to rear of evaporator.
● Drill hole through the walk-in wall large enough to pa refrigeration line , electrical line and
drain line.
● Connect liquid and uction line to the coil and the conden ing unit.
● Lubricate rubber eal in male half of coupling with refrigeration oil.
● Thread coupling halve together by hand to en ure proper mating of
thread . Tighten with wrenche until coupling bodie “bottom” or a
definite re i tance i felt (See Figure #2.)
igure #2 Quick-Couple Coupling Detail
● U ing a cribe or ink pen, mark a line lengthwi e from the coupling hex to the bulkhead. Then tighten
an additional 1/6 to 1/4 turn. The mi alignment of the mark will how the degree of tightening for future
reference. Thi final turn i nece ary to en ure that the knife edge metal eal bite into the bra eat of
the coupling halve , forming a leak-proof joint.
● When routing refrigeration line , pecial care hould be taken not to “kink” the line and re trict the
flow of refrigerant.
NOTE: Wiring diagrams are located inside the pre-wired electrical panel on
the condensing unit.
CAUTION
Be sure the electrical supply is sufficient for all electrical loads of the quick-Couple Remote
Refrigeration system.

5/16 Rev. B 57-02497 15
● Connect correctly rated over current protection device in the ervice line to the ervice line J-
box on the conden ing unit.
● After routing conden ate line from drain pan of evaporator coil, eal around all refrigeration,
electrical and drain line with ilicone or butyl caulking.
● Start compre or and allow to run at lea t 24 hour before placing product into the walk-in.
During the testing period you should:
● Check the temperature holding range again t the control etting.
● On low temperature unit , check the defro t control y tem to ee that all ice i removed from
the coil during each defro t cycle.
● Perform check of door operation and all other component operation .
The e particular y tem are pre-charged at the factory with proper refrigerant, but hould be
operationally checked a per page 11, A.6 and A.7.

5/16 Rev. B 57-02497 16
VII. Final Check List for All Models
A. Check high-low pre ure control etting .
B. Check etting of defro t timer:
1. Medium temperature 2 to 4 defro t /24 hour , with 35 minute fail afe.
2. Low temperature 3 to 4 defro t /24 hour , with 44 minute fail afe.
C. Check operating pre ure.
D. Check electrical requirement of unit to power upply voltage.
E. Set temperature control for de ired temperature range.
F. Check etting of thermo tatic expan ion valve for proper operation.
G. Check ight gla for proper refrigerant charge.
H. Check compre or oil level.
I. Check y tem for proper defro t etting and operation.
J. Check conden ing unit for vibrating or rubbing tubing. Dampen or clamp a required.
K. Open all valve completely counter clockwi e.
L. Check packing nut on all ervice valve .
M. Replace all ervice valve cap and latch unit cover .

5/16 Rev. B 57-02497
NOTE: Sizes specified are for Type "L" copper tubing.

5/16 Rev. B 57-02497 18
NOTE: Sizes specified are for Type "L" copper tubing.

5/16 Rev. B 57-02497
EQUIVALENT LENGTH ALLOWANCE FOR FITTINGS
EQUIVALENT LENGTH IN FEET
FITTING 90° 45° Tee Tee
SIZE Ell Ell (Line) (Branch)
1/2" .9 .4 .8 2.0
5/8" 1.0 .5 1.0 2.5
7/8" 1.5 .7 1.5 3.5
1-1/8" 1.8 .9 1.5 4.5
1-3/8" 2.4 1.2 1.8 6.0
1-5/8" 2.8 1.4 2.0 7.0
2-1/8" 3.9 1.8 3.8 10.0
Chart A
GENERAL:
1. Suction line hould be pitched down in direction of flow, 1/2" per 10 feet of line.
2. Refrigerant line hould be upported and fa tened properly to prevent leak and for
profe ional looking in tallation. Support hould be every 5 feet for line to 7/8" OD, 7 feet
for 1-1/8" to 1-3/8" OD line , and 10 feet for 1-5/8" and 2-1/8" OD line .
3. Where conden ation dripping would be objectionable, in ulate uction line , and where the un
could adver ely affect performance, in ulate both the liquid and uction line . In ulation
thickne of 1/2" will u ually be adequate.
4. A “P” trap mu t be in talled at the bottom of the ri er in all vertical uction line ri ing 4" or
more. To in ure proper oil return to the conden ing unit, the trap hould be the ame ize a the
horizontal line and the ri er hould be ized per the line izing chart on page 14-17.
In in tallation where conden ate can accumulate on the vibra orber, a covering of heat hrink
PVC tubing or waterproof tape may be u ed to prevent freezing under the ferrule, cau ing a
rupture.

5/16 Rev. B 57-02497 20
LOW AMBIENT OPERATION CHARGE
Some Ma ter-Bilt
®
unit are provided with conden er flooding valve to maintain proper head pre ure during the winter.
The e valve function by reducing the effective conden er area by flooding or “backing up” refrigerant in the conden er to
reduce the amount of urface available for conden ing. To operate properly, more charge i required during thi flooding
condition. The e flooding valve are tandard on “B” model and optional on other .
To u e the chart , multiply the number in Chart B by the percent flooding required in Chart C to arrive at the additional charge
required after providing a clear ight gla .
Example: Determine the additional charge required to operate a BCHX0750 at +20°F uction if the unit i charged at +50°F.
From Chart B, model BCHX0750 ha a conden er internal volume of 26.3 lb . of refrigerant. From Chart C at +50°F at time
of charging and +20°F uction, the conden er would need to be flooded 32%.
Therefore, multiply 26.3 lb . x 32% = 8.4 lb . to arrive at the additional charge that mu t be added after clearing the ight gla
for proper winter operation.
CONDENSER VOLUME IN LBS.
Chart B
Lbs. of Lbs. of Lbs. of Lbs. of Lbs. of Lbs. of
Charge Charge Charge Charge Charge Charge
Unit to Fill to Fill Unit to Fill to Fill Unit to Fill to Fill
Model (R-22) (R- 0 A) Model (R-22) (R- 0 A) Model (R-22) (R- 0 A)
BCH*0300 8.4 7.1 BHMX0300 8.4 MCHX0060 4.2
BCH*0500 13.6 13.2 BHMX0400 13.6 MCHX0080 4.2
BCH*0750 26.3 25.6 BHMX0500 13.6 MCHX0110 4.2
BCH*1000 38.8 37.8 BSLZ0300 5.3 MCHX0150 7.9
BCH*1500 38.8 37.8 BSLZ0350 5.3 MCHX0190 7.9
BCHX0150 5.8 BSLZ0400 7.1 MCHX0300 10.2
BCHX0200 5.4 BSLZ0500 7.1 MCHX0440 25.0
BCLZ0150 5.7 BSLZ0600 13.2 MCHX0500 25.0
BCLZ0170 5.7 BSLZ0750 13.2 MCLZ0020 4.1
BCLZ0200 5.7 MCLZ0030 4.1
BCLZ0250 5.3 MCLZ0050 4.1
BCLZ0280 7.1 MCLZ0070 4.1
BCLZ0300 7.1 MCLZ0100 7.7
BCLZ0400 7.1 MCLZ0140 7.7
BCLZ0600 13.2 MCLZ0170 10.0
BCLZ0750 20.9 MHHX0060 4.2
BCLZ0900 25.6 MHHX0080 4.2
BCLZ1000 25.6 MHHX0110 4.2
BCLZ1500 37.8 MHHX0120 7.9
BCLZ2200 37.8 MHHX0150 7.9
BCM*0150 5.8 5.7 MHHX0190 7.9
BCM*0200 5.4 5.3 MHHX0250 7.9
BCM*0300 8.4 7.1 MHHX0300 10.2
BCM*0500 13.6 13.2 MHHX0350 10.2
BCM*0750 21.4 20.9 MHHX0440 25.0
BCM*1000 26.3 25.6 MHHX0500 25.0
BCM*1500 38.8 37.8 MHLZ0020 4.1
BCM*2000 38.8 37.8 MHLZ0030 4.1
BCMX0070 N/A N/A MHLZ0050 4.1
BCMX0100 N/A N/A MHLZ0070 4.1
BHH*0200 5.4 5.3 MHLZ0090 7.7
BHH*0250 5.4 5.3 MHLZ0120 7.7
BHH*0300 8.4 7.1 MSLZ0070 4.1
BHH*0400 13.6 13.2 MSLZ0100 7.7
BHH*0500 13.6 13.2 MSLZ0150 7.7
BHMX0200 5.4 MSLZ0180 24.3
BHMX0250 5.4 MSLZ0220 24.3
*Unit can be filled with either R-22 or R-404A refrigerant