Master-Bilt TAF-27 Service Manual

Installation & Operations Manual

Master-Bilt Products

908 Highway 15 North

New Albany, MS 38652

Phone: [phone]

10/16/03

PN 217-90000

2

TABLE OF CONTENTS

INTRODUCTION………………………………….……………………………………………………………………
4
STORE CONDITIONS…………………………….……………….…..…………………………………………….. 4
WARNING LABELS AND SAFETY INSTRUCTIONS………..…..……………………………………………… 5
PRE-INSTALLATION INSTRUCTIONS………………………..…..………………………………….…………… 6
Inspection for ShippingDamage……………………………………………………………….…………… 6
INSTALLATION INSTRUCTIONS………………………………………………………………………………….. 7

General Instructions…………………………………………………………………………………………. 7
Location………………………………………………………………………………………………………..7
Dimensional Data……………………………………………………………………………………………..7

STARTING PROCEDURE…………………………………………………………………………………………….8
FINAL CHECK LIST…………………………………………………………………………………….……………..8
SERVICE INSTRUCTIONS……………………………………………………………………………………………9
MASTER-BILT PART NUMBERS…………………………………………………………………………………...10
SALE AND DISPOSAL………………………………………………………………………………………………..11
WIRING DIAGRAMS TAC27.…………………………………………….……………………….………………….12
WIRING DIAGRAMS TAC27R.…………………………………………….……………………….………………..13
WIRING DIAGRAMS TAC48.…………………………………………….……………………….………………….14
WIRING DIAGRAMS TAC48R.…………………………………………….……………………….………………..15
WIRING DIAGRAMS TAC74…………………………………………….……………………….……………….….16
WIRING DIAGRAMS TAC74R.…………………………………………….……………………….………………..17
WIRING DIAGRAMS TAF27.…………………………………………….……………………….…………………. 18
WIRING DIAGRAMS TAF48/TAF74…………………………………….……………………….…………………. 19
WIRING DIAGRAMS TAF-ALL REMOTE AND QUICK CONNECT….……………………….……………….. 20

3

INTRODUCTION

Thank you for purchasing a Master-Bilt cabinet. This manual contains important instructions for installing,
using and servicing a Master-Bilt TAF/TAC case. A parts list is included in with this manual. Read all these
documents carefully before installing or servicing your equipment.

STORE CONDITIONS

The Master-Bilt TAF/TAC cases are designed to operate in the controlled environment of an air conditioned
store. The store temperature should be at or below 75°F and a relative humidity of 55% or less. At higher
temperature or humidity conditions, the performance of these cases may be affected and the capacity
diminished. It is not uncommon in a newly constructed store for the temperature and humidity to be above
design conditions. These excessive conditions may produce sweating in the case until the store is operational
and the ambient environment is more desirable.

The Master-Bilt TAF/TAC should not be positioned where it is directly exposed to rays of sun or near a direct
source of radiant heat or air flow. This will adversely affect the case and will result in poor performance.

If this case is to be located against a wall there should be at least 4” space between the wall and the back of
the case. This space will allow for the circulation of air behind the case which will prevent condensation on the
exterior surfaces.

NOTICE

Read this manual before installing your cabinet. Keep the manual and refer to it before doing any
service on the equipment. Failure to do so could result in personal injury or damage to the cabinet.

DANGER

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

Installation and service of the refrigeration and electrical components of the cabinet must be
performed by a refrigeration mechanic and/or a licensed electrician.

4

The portions of this manual covering refrigeration and electrical components contain technical instructions
intended only for persons qualified to perform refrigeration and electrical work.
This manual cannot cover every installation, use or service situation. If you need additional information, call or
write us:

Customer Service Department
Master-Bilt Products
Highway 15 North
New Albany, MS 38652
Phone [phone]
Fax [phone]

WARNING LABELS AND SAFETY INSTRUCTIONS

This symbol is the safety-alert symbol. When you see this symbol on your cabinet or in this
manual, be alert to the potential for personal injury or damage to your equipment.

Be sure you understand all safety messages and always follow recommended precautions and safe operating
practices.

NOTICE TO EMPLOYERS

You must make sure that everyone who installs, uses or services your cabinet is thoroughly familiar
with all safety information and procedures.

Important safety information is presented in this section and throughout this section and throughout the
manual. The following signal words are used in the warnings and safety messages:

DANGER: Severe injury or death will
WARNING: Severe injury or death can
CAUTION: Minor injury or damage to your cabinet can occur if you ignore the message.
NOTICE: This is important installation, operation or service information. If you ignore the

message, you may damage your cabinet.

The warning and safety labels shown throughout this manual are placed on your Master-Bilt Products
cabinet at the factory. Follow all warning label instructions. If any warning or safety labels become
lost or damaged, call your customer service department at [phone] for replacements.

occur if you ignore the message.

occur if you ignore the message.

CAUTION!

GROUND REQUIRED

FOR SAFE OPERATION

This label is located on top of the electrical control This label is attached to the cabinet power cord
label and on the wiring channel. on models with a power cord.

5

PRE-INSTALLATION INSTRUCTIONS

INSPECTION FOR SHIPPING DAMAGE

You are responsible for filing all freight claims with the delivering truck line. Inspect all cartons and crates for
damage as soon as they arrive. If damage is noted to shipping crates or cartons or if a shortage is found, note
this on the bill of lading (all copies) prior to signing.

If damage is discovered when the cabinet is uncrated, immediately call the delivering truck line and follow up
the call with a written report indicating concealed damage to your shipment. Ask for an immediate inspection of
your concealed damage item. Crating material must

be retained to show the inspector from the truck line.

INSTALLATION INSTRUCTIONS

GENERAL INSTRUCTIONS

1. Be sure the equipment is properly installed by competent service people.

2. Keep the equipment clean and sanitary so it will meet your local sanitation codes.

3. Rotate your stock so that older stock does not accumulate. This is especially important for ice
cream. A "First-In, First-Out" rotation practice will keep the products in good salable condition.

4. Do not place product in the case when it is soft or partially thawed. Also, product should not be put in the
case for at least 6 hours after it is started.

5. Stock cases as quickly as possible, exposing only small quantities to store temperatures for short periods of
time.

6. When replacing burned out fluorescent tubes, be sure that the electrical power to the lighting circuit is
turned off.

MECHANICAL

Remove front grille and check refrigeration lines to see that they are free (not touching each other or
compressor). Spin condenser fan blade to see that it is free.

Check that all service valves (2) are open. Cut compressor
hold-down strap and remove. The springs are secured for
shipping by either tightening bolts or shipping strap. Remove the
strap or loosen the hold-down bolts so that the compressor
floats freely. Check all refrigeration lines and electrical conduit
for rubbing or chaffing, paying particular attention to area where
lines enter the cabinet.

Remove cabinet from crate base and slide into location. Cabinet
must be level from side to side and front to back for correct
draining of coil pan and for self-closing doors to operate
correctly. Allow minimum of 4” between back of cabinet and wall
and between top of cabinet and ceiling for proper condensing
unit air circulation.

To comply with Sanitation requirements the cabinet must be mounted on legs (6” high min.) or casters or the
base must be sealed to the floor with an N.S.F. listed silicone sealant.
To comply with UL requirements the cabinet must have a minimum clearance of 4” at the top, 6” at the rear
and 0” at each side.

6

NOTICE TO STORE OWNERS / MANAGERS
Moisture or liquid around or under the cabinet is a potential slip/fall hazard for persons walking by or

working in the general area of the cabinet. Any cabinet malfunction or housekeeping problem that
creates a slip/fall hazard around or under the cabinet should be corrected immediately

If moisture or liquid is observed around or under a Master-Bilt cabinet, an immediated investigation should be
made by qualified personnel to determine the source of the moisture or liquid. The investigation should
determine if the cabinet is malfunctioning or if there is a drain pipe leaking.

ELECTRICAL

WARNING

Before servicing electrical components in the case or the doors or door frames make sure all power to
case is off. Always use a qualified technician.

.

INSTALLATION INSTRUCTIONS

To comply with N.S.F. requirements,
7this cabinet must be mounted on
casters, legs (6” high min.) or the
base must be sealed to the floor.
The casters provided with this case
screw into the holes from which the
shipping bolts were removed.

7

CONDENSATE PAN INSTALLATION FOR TOP MOUNT CABINETS ONLY

1. Before moving cabinet into place,
remove the condensate pan from
the top unit compartment.

2. Using the two screws supplied with

the pan, attach the pan to the back
of the cabinet at the two holes near
the bottom of the plastic drain line.
Be sure pan is NOT located directly
under cabinet. When the pan is
attached, feed drain line into the
open hole in screen and clamp the
heater conduit to the back of the
cabinet. Due to this condensate
pan, this case must be a minimum
of 6” from the wall.

3. If cabinet must be located next to
wall on legs, the pan can be located
under the cabinet. When this is
done, steam will accumulate on the
bottom of the cabinet if there is not
adequate ventilation, and rusting of
the bottom of the cabinet will occur.

Low Temperature Freezers – TAF Models

The TAF - 27 models are cord connected and operate on a 15 amp, 115/60/1 circuit. The TAF – 48 models are
cord connected and operate on a 20 amp, 115/60/1 circuit. The TAF – 74 models have two junction boxes
mounted on top of the cabinet at the right rear for permanent connection to power. One junction box is labeled
115v. (black,white and green lead) ; the other is labeled 230v. (black,red and green lead). These boxes should
be connected to their respective power source.

Check inside the cabinet for the power requirement for each cabinet. The label is located in the upper left hand
corner. These TAF models are equipped with timers and electric defrost with a defrost termination and fan
delay thermostat. Because of this thermostat, on initial start up the evaporator fan motors will not start and you
cannot initiate a defrost until the cabinet temperature is lowered to 10°F to 20°F

The temperature thermostat on the TAF models does not have an “Off” position, so the condensing unit will
start up immediately when the power is connected to the cabinet.

Medium Temperature Refrigerators (TAC Models)

All TAC models are equipped with a 115/60/1 lead cord and plug cap. When connected to power, the
condensing unit and evaporator fan (s) will start. The mullion heaters will heat and, when the door is opened,
the lights will be energized.

8

FINAL CHECK LIST

A. Check setting of defrost timer:

1. Four defrost/24 hours, with 30 minute fail safe. (TAF ONLY)

B. Check operating pressures.
C. Check electrical requirements of unit to supply voltage.
D. Set temperature control for desired temperature range.
E. Check sight glass for proper refrigerant charge.
F. Check system for proper defrost settings and operation.
G. Check condensing unit for vibrating or rubbing tubing. Dampen and clamp as required.
H. All valves should be completeley open counter-clockwise.
I. Check packing nts on all service valves.
J. Replace all service valve caps and latch unit covers.

SERVICE INSTRUCTIONS (Trouble Shooting Guide)

1. High head pressure and high back pressure:
A. Condenser coil clogged or restricted.

B. Condenser fan motor defective.

2. Low back pressure and low head pressure:
A. Restriction in system.

B. Refrigerant undercharged.
C. Leak in system.

3. Pressures normal – cabinet warm:
A. Coil blocked with frost or ice (see #4).

B. Refrigerant undercharged.
C. Control set too warm.
D. Air screen disturbance.

4. Coil blocked with frost or ice:
A. Defective temperature control. E. P-trap in drain not installed.

B. Time clock not operating properly. F. Doors aren’t sealing when closed.
C. Improper time clock setting. G. Evaporator fan motor defective.
D. Defrost heater not operating. I. Low voltage.

5. Compressor starts and runs – but cycles on overload:
A. Low voltage.

B. Dropped phase (3 phase).
C. Overload protector defective.
D. High head pressure (see#1).

9

6. Compressor will not start – hums, but cycles on overload:
A. Low voltage.

B. Relay defective.
C. Overload defective.
D. High head pressure (see #1).

7. Special service situations:
If moisture or liquid is observed around or under a Master-Bilt cabinet, an immediate investigation

should be made by qualified personnel to determine the source of moisture or liquid. The investigation
made should determine if the cabinet is malfunctioning or if there is a simple housekeeping problem.

Moisture or liquid around or under a cabinet is a potential slip/fall hazard for persons walking by or
working in the general area of the cabinet.

Any cabinet malfunction or housekeeping problem that creates a slip/fall hazard around or under a
cabinet should be corrected immediately

.

MASTER-BILT PART NUMBERS

The table below gives Master-Bilt part numbers. Use this chart when ordering replacement parts for your
TAC/TAF cases.
Description TAC-27 TAC-48 TAC-74 TAF-27 TAF-48 TAF-74
Bulb 23-00343 23-00343 23-00343 23-00343 23-00343 23-00343
Bulb Holder 23-01080 23-01080 23-01080 23-01080 23-01080 23-01080
Bulb Shield 23-01465 23-01465 23-01465 23-01465 23-01465 23-01465
Caster W \ Brake 27-00591 27-00591 27-00591 27-00591 27-00591 27-00591
Casters W \ O Brake 27-00590 27-00590 27-00590 27-00590 27-00590 27-00590
Capillary Tube 11-01450 11-01450 11-01451
Coil Defrost Heater 17-00443 17-09113 17-09076
Condensate Heater 17-00421 17-00421 17-00421 17-00421 17-00421 17-00421
Condensing Unit 01-01471 01-01471 01-01472 01-01488 01-01510 01-01487
Def. Term. Fan Delay 19-13195 19-13195 19-13195
Digital Thermometer 19-13271 19-13271 19-13271 19-13271 19-13271 19-13271
Door Frame Heater 17-09148 17-09144 17-09144 17-09449 17-09142 17-09142
Door Gasket 37-01207 37-01211 37-01211 37-01207 37-01211 37-01211
Door Handle 35-01488 35-01488 35-01488 35-01488 35-01488 35-01488
Door Hinge Assembly A35-01501 A35-01501 A35-01501 A35-01501 A35-01501 A35-01501
Door Light Switch 35-01506 35-01506 35-01506 35-01506 35-01506 35-01506
Door Opening Trim 29-01481 29-01481 29-01481 29-01481 29-01481 29-01481
Drain Line Heater 17-00404 17-00404 17-00404
Drier 09-09308 09-09308 09-09308 09-09171 09-09506 09-09506
Evaporator Coil 07-00750 07-00135 07-00135 07-00750 07-13089 07-13089
Evaporator Fan Blade 15-01184 15-01184 15-01184 15-01184 15-01184 15-01184
Evaporator Fan Guard 25-00205 25-00205 25-00205 25-00205 25-00205 25-00205
Evaporator Fan Motor 13-00685 13-00685 13-00685 13-00685 13-00685 13-00685
Expansion Valve 09-09187 09-09542 09-09542
Female Plug 21-00577
Front Control
Heater Safety Control 19-01307 19-01164 19-01164
Leg 27-00558 27-00558 27-00558 27-00558 27-00558 27-00558
Pilaster 33-01408 33-01408 33-01408 33-01408 33-01408 33-01408
Pressure Control 19-13173 19-13173
Power Cord 21-00312 21-00312 21-00312 21-01454 21-01454

10

Shelf Clips 33-01011 33-01011 33-01011 33-01011 33-01011 33-01011
Shelves 33-01455 33-01456 33-01456 33-01455 33-01456 33-01456
Temperature Control 19-00903 19-00903 19-00903 19-13607 19-13607 19-13607
Thermometer
Timer 19-00817 19-00817 19-00815

SALE AND DISPOSAL

OWNER RESPONSIBILITY

If you sell or give away your Master-Bilt cabinet you must make sure that all safety labels and the Installation ­Service Manual are included with it. If you need replacement labels or manuals, Master-Bilt will provide them
free. Contact the customer service department at Master-Bilt at [phone].

The customer service department at Master-Bilt should be contacted at the time of sale or disposal of your
cabinet so records may be kept of its new location.

If you sell or give away your Master-Bilt cabinet and you evacuate the refrigerant charge before shipment,
Master-Bilt recommends that the refrigerant charge be properly recovered in complience with section 608 of
the Clean Air Act effective November 1995 and in accordance with all applicable local, regional, or national
standards.

11

CONDENSATE
PAN HEATER

J BOX

W

BK

DIGITAL

THERM.

COND

FAN

INCANDESCENT

LIGHT

W

COMPRESSOR

R

W/BL

TRANSFORMER

TEMP.
CONT.

BK

W

B

R

R

EVAP.

FANS

115/60/1

NEMA #5-15P

LIGHT

DOOR
FRAME
HEATER

WIRING DIAGRAM

SWITCH

TAC-27,-27HD

07/19/95

TC27

12

CONDENSATE
PAN HEATER

115/60/1 CONTROL CIRCUIT

TO CONDENSING UNIT POWER TERMINALS

OR

TO LIQUID LINE SOLENOID VALVE COIL
TERMINALS.

(

CONDENSING UNIT ON SEPERATE POWER

)

SUPPLY.

DIGITAL

THERM.

J BOX

TRANSFORMER

J BOX

W

115/60/1

BK

W

BR

BK

W

TEMP.
CONT.

EVAP.

FANS

INCANDESCENT

LIGHT

W

R

DOOR
FRAME
HEATER

W/B

B

LIGHT
SWITCH

R

R

07/19/95

WIRING DIAGRAM TAC-27-R

TC27R

13

DIGITAL

THERM.

CONDENSATE
PAN HEATER

COND

FAN

COMPRESSOR

TRANSFORMER

J BOX

W

BK

TEMP.
CONT.

BK

W

EVAP.

FANS

BW

R

LIGHT
SWITCH

R

R

WW

BB

R

LIGHT

SWITCH

DOOR
FRAME
HEATER

INCANDESCENT

LIGHT

W

R

DOOR
FRAME
HEATER

115/60/1

NEMA 5-15P

07/19/95

WIRING DIAGRAM

TAC-48,-48HD

TC48

14

CONDENSATE
PAN HEATER

115/60/1 CONTROL CIRCUIT

TO CONDENSING UNIT POWER TERMINALS

OR

TO LIQUID LINE SOLENOID VALVE COIL
TERMINALS.

(

CONDENSING UNIT ON SEPERATE POWER

)

SUPPLY.

DIGITAL

THERM.

TRANSFORMER

J BOX

J BOX

W

115/60/1

BK

W

BR

BK

W

TEMP.
CONT.

EVAP.

FANS

LIGHT

SWITCH

W

R

LIGHT
SWITCH

R

R

R

WW

BB

DOOR
FRAME
HEATER

INCANDESCENT

LIGHT

W

R

DOOR
FRAME
HEATER

B

WIRING DIAGRAM TAC-48-R

15

07/19/95

TC48R

COND

FAN

DIGITAL

THERM.

CONDENSATE
PAN HEATER

COMPRESSOR

TRANSFORMER

J BOX

W

BK

TEMP.
CONT.

BK

EVAP.

W

FANS

RW

B

R

LIGHT

SWITCH

DOOR
FRAME
HEATER

INCANDESCENT

LIGHT

W

R

LIGHT

SWITCH

WB

DOOR
FRAME
HEATER

WW

BB

LIGHT
SWITCH

R

R

R

R

DOOR
FRAME
HEATER

INCANDESCENT

LIGHT

W

R

115/60/1

NEMA #5-15P

07/19/95

WIRING DIAGRAM

TAC-74, 74HD

TC74

16

CONDENSATE
PAN HEATER

J BOX

W

115/60/1

BK

115/60/1 CONTROL CIRCUIT

TO CONDENSING UNIT POWER TERMINALS

OR

TO LIQUID LINE SOLENOID VALVE COIL TERMINALS

(CONDENSING UNIT ON SEPERATE POWER SUPPLY)

TRANSFORMER

DIGITAL

THERM.

WR

B

INCANDESCENT

LIGHT

TEMP.
CONT.

BK

EVAP.

W

R

WW

BB

INCANDESCENT

LIGHT

FANS

R

W

R

LIGHT

SWITCH

R

DOOR
FRAME
HEATER

LIGHT

SWITCH

R

DOOR
FRAME
HEATER

WIRING DIAGRAM TAC-74

W

R

R

LIGHT

DOOR
FRAME
HEATER

SWITCH

07/19/95

-R

TC74R

17

INCANDESCENT

LIGHT

DEFROST TERMINATION,
FAN DELAY THERMOSTAT

W

R

OR
BR
BL

BK

1

32

TEMP.
CONT.

EVAP.

FAN

DRAIN LINE HEATER

POWER SUPPLY
115/60/1
NEMA #5-20P

Y

W

HEATER

LIMIT SW.

BK

Y

EVAPORATOR HOUSING

OR

44 XX

BL

TIMER

33

33

DEFROST HEATER

CONT.
PRES.

(OPTIONAL)

COMPRESSOR

COND

FAN

TMTM

1122

W

Y
OR
BR

BL

R
BK

NN

W

WBK

SWITCH

W

W

W

W

W

W

G

BK

BK

BK

R

W
W

BK

BK

BK

COND.
EVAP.

.

R

R

E

E

M

H

R

T

O
F

.

S

T

N

G

A

I

R

D

T

ELECTRICAL TRAY

WIRING DIAGRAM

LIGHT

SWITCH

R

R

(WHEN PROVIDED)

W

BK

BKBK WW

R

LIGHT

SWITCH

R

DOOR

FRAME

HEATER

DOOR

FRAME

HEATER

TAF/TUF-27, -27HD,
TAF/TUF-27H, -27HHD

18

DIGITAL

THERM.

TF27-HARNS

5/11/00

TAF/TUF-48HD/74HD SERIES (115/208-230/60/1

EVAP.

FAN

EVAP.

FAN

WHEN PROVIDED

DEFROST TERM. &
FAN DELAY

1

3

2

DEFROST

HEATER

YEL

TIMER

TM

12

3

OR

4X

N

BK

TEMP.
CONT.

BR

BK

COMPRESSOR

COND

FAN

LIGHT

SWITCH

INCANDESCENT

LIGHT

R

R\W

INCANDESCENT

LIGHT

WHEN PROVIDED

DIGITAL

THERMOMETER

DOOR

FRAME

HEATER

HEATER
SAFETY

DRAIN LINE HTR.

TRANSFORMER

LIGHT

SWITCH

BK

W

R/W

R

R\W

DOOR

FRAME

HEATER

DOOR

FRAME

HEATER

R

G

G

BK

W

CONDENSATE

EVAPORATOR

208-230/60/1

115/60/1

R

SWITCH

R\W

LIGHT

LIGHT

SWITCH

R

R R

LIGHT

SWITCH

R\W R\W R\W

DOOR

FRAME

HEATER

WHEN PROVIDED

WIRING DIAGRAM TAF\TUF

19

DOOR

FRAME

HEATER

DOOR

FRAME

HEATER

-48HD, -74HD

-4HHD, -74HHD

TAF-TUF-23DR-HD-HHD

LIGHT

SWITCH

7/20/00

TAF/TUF-27/48/74 SERIES - REMOTE/QUICK CONNECT (208-230\60\1)

EVAP.

FANS

IF PROVIDED

DEFROST TERMINATION,
FAN DELAY THERMOSTAT

R

Y\W

DEFR.

HEATER

EVAP.

FANS

OR

BR

TEMP.

BL/W

Y\W

CONT.

OR

DRAIN LINE HEATER

BR

OR

OR

BL/W

Y/W

J- BOX

W

BK

BR

BK

BL

HEATER
LIMIT SW.

RR

G

BK

FIELD MOUNTED

SOLENOID

SOL.

TO TERMINAL #4

TO TERMINAL #N

TO TERMINAL #X

TO TERMINAL #3

T
I
N
U

1
/

G

0

N

6

I

/

S

0

N

3

E

2

D

/

N

8

O

0

C

2

O
T

.
R
T
H

N
A
P

.
D
N
O
C

R

BK/W

R

LIGHT

SWITCH

DOOR #3 IF PROVIDED

DOOR
FRAME
HEATER

W

INCANDESCENT

LIGHT

W

R

TSFR

X
O
B

­J

DIGITAL

THERM.

BK/W

LIGHT
SWITCH

WBK

R

R

W

BK

R

R

LIGHT

SWITCH

DOOR #2 IF PROVIDED

WW

BK/W

DOOR
FRAME

W

BK

INCANDESCENT

LIGHT

W

R

DOOR
FRAME
HEATERHEATER

BK

W

G

7/18/00

1
/
0
6
/
5
1
1

WIRING DIAGRAM (TAF/TUF REMOTE/QUICK CONNECT)

20

TAF-TUF-123DR-R-Q