True TBC-24-A, TWC-24-A, TUR-24BD-A, TUR-24DD-A, TWC-24DZ-A Service Manual

TRUE RESIDENTIAL

®

15 INCH AND 24 INCH UNDERCOUNTER SERVICE MANUAL

“A” AND “B” REVISIONS

PRESERVE THE MOMENT

®

TABLE OF CONTENTS

INTRODUCTION 1

INSTALLATION CHECKLIST 2

SAFETY PRECAUTIONS / DATA TAG INFORMATION 3

DEPARTMENT CONTACT INFORMATION 4

ELECTRICAL SPECIFICATIONS 5

DUAL ZONE HOME ALARM SYSTEM 6

UN CR ATI NG 7

LEVELING REFRIGERATOR 8

INSTALLATION ANTI-TIP BRACKETS 9-10

INSTALLING THE DOOR STOP 11

INSTALLING 90˚ DOOR HINGE (OPTION) 11-13

DRAWER DEPTH ADJUSTMENTS 14

DRAWER FRONTS ADJUSTMENTS 15

DRAWER GLIDES ADJUSTMENTS 15

DOOR REMOVAL 16

STAINLESS STEEL & STAINLESS GLASS DOOR ADJUSTMENTS 17

OVERLAY PANEL AND OVERLAY PANEL GLASS / GLASS DOOR ADJUSTMENTS 18

WINE SHELVING ADJUSTMENTS / GLASS SHELVING ADJUSTMENT 19

LED LIGHTING 20

STACKING KIT 21-2 2

TECHNICAL DATA 23

SOFTWARE INFORMATION AND START UP MODE 24

SEQUENCE OF OPERATION 25

USER INTERFACE COMMANDS 26-27

DEFROST 28

EVAPORATOR COVER REMOVAL 29-30

EVAPORATOR SECTION LAYOUT 31-32

PROBES VALUES 32

EVAPORATOR FAN DRIVER 32

CONTROL BOARD REPLACEMENT AND MODEL SELECT SEQUENCE OF OPERATION 33

WIRING DIAGRAMS 34-44

COMPRESSOR OPERATION 45

TYPES OF COMPRESSORS AND SPECIFICATIONS 46

VARIABLE SPEED COMPRESSOR DIAGNOSTICS 47

INVERTER BOARD DIAGNOSTICS TABLE 48

COMPRESSOR COMPARTMENT LAYOUT 49

SEALED SYSTEM 50

GOOD REFRIGERATION PRACTICES 51

SYSTEM PRESSURES 51

TROUBLESHOOTING, REPAIRS AND REPLACEMENT 52-54

MAINTENANCE 55

STAINLESS STEEL CARE AND CLEANING 56

GASKET CLEANING 57

GENERAL MAINTENANCE 57

WARRANTY 58

15 & 24 INCH SERVICE MANUAL

CONTACT INFORMATION

TRUE RESIDENTIAL

®

INTRODUCTION

I n s t a l l a t I o n C h e C k l I s t

s a f e t y P r e C a u t I o n s

D a t a ta g I n f o r m a t I o n

D e P a r t m e n t C o n t a C t I n f o r m a t I o n

e l e C r I C a l s P e C I f I C a t I o n s

D u a l Z o n e h o m e a l a r m s y s t e m

u n C r a t I n g

1 - 22

l e v e l I n g r e f r I g e r a t o r

I n s t a l l a t I n g a n t I - tI P B r a C k e t s

I n s t a l l a t I n g th e D o o r s t o P

I n s t a l l I n g 9 0˙ D o o r h I n g e ( o P t I o n )

D r a w e r D e P t h a D j u s t m e n t s

D r a w e r f r o n t s a D j u s t m e n t s

D r a w e r g l I D e s a D j u s t m e n t s

D o o r r e m o v a l

s t a I n l e s s st e e l & s t a I n l e s s g l a s s D o o r a D j u s t m e n t s

o v e r l a y P a n e l & o v e r l a y Pa n e l g l a s s D o o r a D j u s t m e n t s

w I n e s h e l v I n g a D j u s t m e n t s / g l a s s s h e l v I n g a D j u s t m e n t

l e D l I g h t I n g

s t a C k I n g k I t

15 & 24 INCH SERVICE MANUAL

1

INSTALLATION CHECKLIST

To ensure a proper installation, this checklist should be completed to ensure that no part of the process has
been overlooked.

Has the electrical circuit been verified of using a dedicated 15-amp circuit with the ground plug attached

and correct polarity. Discrepancies in the supplied power can cause serious damage and potentially void
all warranty. Please see page (5) for a more detailed description of electrical guidelines.

Have all the packaging materials been removed? NOTE: please make sure the toe kick which is taped to

the back of the unit is removed prior to pushing the unit in place.

Have the anti-tip brackets been installed securely and are they properly engaging the unit? NOTE: the

location of the anti-tip brackets is taped within the toe kick packaging. For installation instructions please
see page (9).

Is the unit leveled properly with all leveling legs making contact with the floor? Has the toe kick been

installed? Proper leveling should be done from the inside of the unit rather than the top exterior of the unit.

Has the door stop been installed?

Has the customer been given the installation / user guide? NOTE: A lock is standard on stainless steel

units, therefore the key to the lock is taped to the back of the user/install guide. Overlay paneled units will
not come with a lock or key.

Have stainless steel surfaces been inspected for any imperfections? This is to be done by the authorized

True dealer or installer with the customer, upon completion of installation. Stainless steel doors, handles
and shelves are covered by limited 30-day warranty for cosmetic defects.

Is the unit operating properly? If not, is the unit plugged in? Is the breaker on? Is the display illuminated

and say “off”? For all control operations and sequences please refer to “user interface commands on True
Precision control” section in the table of contents per the model of the unit you are installing.

Does the customer understand the unit’s operation?

Make sure the unit is operating and cooling for 24 hours prior to loading with product. NOTE: loading the

unit with some bottles of water will provide assurance the unit is working properly during this 24-hour
time-frame.

Verify all the shelves are securely in place.

Has the Dual Zone wine unit been connected to an external alarm system? Refer to page (6)

TRUE RESIDENTIAL

2

®

SAFETY PRECAUTIONS

• This refrigerator must be properly installed and located in accordance with the installation instructions
before it is used.

• Do not allow children to climb, stand or hang on the shelves in the refrigerator. They could damage the
refrigerator and seriously injure themselves.

• Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other
appliance.

• Keep hands away from the “pinch point” areas (gaps between the doors and between the doors and
cabinet) small areas are not necessarily safe.

• Unplug the refrigerator before cleaning and making repairs.

NOTE: WE STRONGLY RECOMMEND THAT ALL SERVICING BE PERFORMED BY A QUALIFIED
INDIVIDUAL.

• Setting temperature control to OFF only removes power from the refrigeration system, it does not remove
power from other circuits. For example, temperature control board and lights.

DATA TAG INFORMATION

Data tags are located on the interior upper left hand wall. The serial # is the method we track all pertinent
information for the unit.

15 & 24 INCH SERVICE MANUAL

3

DEPARTMENT CONTACT INFORMATION

TRUE-RESIDENTIAL.COM/SUPPORT

SERVICE DEPARTMENT – SUPPORTS AND TRAINS FIELD SERVICE PROVIDERS ON TRUE RESIDENTIAL EQUIPMENT

HELPS TROUBLESHOOT AND REPAIR SERVICE ISSUES IN THE FIELD ON TRUE RESIDENTIAL PRODUCTS

Residential Phone Number : 844-746-9423

Fax : [phone]

Email : [e-mail]

Mike Hurd

Dave Swift

Hours: Monday-Thursday 7:00AM-7:00PM CST

Friday 7:00AM-6:00PM

Saturday 8:00AM-12:00PM

WARRANTY DEPARTMENT – ANSWERS QUESTIONS REGARDING WARRANTY STATUS

PROCESSES WARRANTY CLAIMS & WARRANTY PARTS ORDERS FROM SERVICE PROVIDERS

Residential Phone Number : 844-849-6179

Fax : [phone]

Email: [e-mail]

Stephanie Bouxsein

Diane Javaux

Submit Claims to: [e-mail]

Hours: Monday-Thursday 7:00AM-7:00PM CST

Friday 7:00AM-6:00PM

PARTS DEPARTMENT – OFFERS NON-WARRANTY PARTS SUPPORT

Residential Phone Number : 844-849-6226

Fax : [phone]

Email: [e-mail]

Gabriela Childers

Abby Baker

Hours: Monday-Thursday 7:00AM-7:00PM CST

Friday 7:00AM-6:00PM

FOR COMMERCIAL PRODUCT INFORMATION, PLEASE CALL 800-325-6152

TRUE RESIDENTIAL

4

®

THANK YOU

FOR YOUR PURCHASE

ELECTRICAL SPECIFICATIONS

Do not, under any circumstances, cut or remove the third (ground) prong from the power cord. For personal
safety, this appliance must be properly grounded.

To minimize the depth of the cutout opening, the electrical outlet must be positioned as shown below. Outlet
must be flush with wall.

Rear wall of cut out

2” 2”

8”

Before your new unit is connected to a power supply, check the incoming voltage with a volt meter. If anything
less than 100% of the rated voltage for operation is noted, correct immediately.

The power cord of this appliance is equipped with a 3-prong (grounding) plug which mates with a standard
3-prong (grounding) wall outlet to minimize the possibility of electric shock hazard from this appliance. A 115V
AC, 60 Hz, 15 amp circuit breaker and electrical supply are required.

Each unit requires a dedicated circuit. Have the wall outlet and circuit checked by a qualified electrician to
make sure the outlet is properly grounded.

If the outlet is a standard 2-prong outlet, it is your personal responsibility and obligation to have it replaced with
the properly grounded 3 prong wall outlet.

Do not use an extension cord or two prong adaptor. Electrical ground is required on this appliance.

The unit should always be plugged into its own individual electrical circuit, which has a voltage rating that
matches the rating plate. This provides the best performance and also prevents overloading house wiring
circuits which could cause a fire hazard from overheated wires. Never unplug your refrigerator by pulling on
the power cord. Always grip plug firmly and pull straight out from the outlet.

Repair or replace immediately all power cords that have become frayed or otherwise damaged. Do not use
a cord that shows cracks or abrasion damage along its length or at either end. When moving the refrigerator
away from the wall, be careful not to roll over or damage the power cord.

WARNING: COMPRESSOR WARRANTIES ARE VOID IF
THE UNIT IS MORE THAN 7 FT. (2.1M) FROM PLUG-IN
CONNECTION OR IF AN EXTENSION CORD IS USED.

15 & 24 INCH SERVICE MANUAL

5

HOME ALARM SYSTEM - DUAL ZONE WINE CABINET ONLY

Dual Zone wine units are provided with three wires located behind the kick-plate that may be connected
to a home alarm system. These connections are for low voltage, low current circuits similar to those used
as signals for alarms on doors and windows. Refer to the specifications of your alarm system to determine
the type of circuit used.
The color codes for the different circuits are as follows:

• Normally closed contacts: White with black and violet

• Normally open contacts: White with blue and black

• Common: White with black

CAUTION: ANY UNUSED TERMINALS SHOULD BE FULLY INSULATED AND ALL WIRES
SHOULD BE SECURED AWAY FROM MOVING PARTS AND SHARP EDGES.

TRUE RESIDENTIAL

6

®

UNCRATING

Required Tools:

• Cutting utensil (utility knife)

• Claw hammer or tin snips

The following procedure is recommended for uncrating
the unit:
MOVE YOUR UNIT AS CLOSE TO THE FINAL LOCATION AS
POSSIBLE BEFORE REMOVING THE WOODEN SKID.

A. Remove nails securing cardboard box to the wooden

skid. Then discard any outer packaging (cardboard,
clear plastic).

B. IMPORTANT: Cut polyband and remove styrofoam

block from underside of the door.

INSPECT FOR CONCEALED DAMAGE.
IMMEDIATELY FILE A CLAIM WITH THE FREIGHT
CARRIER IF THERE IS DAMAGE.

A

B

C. Remove skid by carefully lifting the refrigerator off

and place skid aside.

D. Open the unit and remove any packing material.

Styrofoam, tape, and any other material used for
shipping purposes.

NOTE: KEYS FOR THE LOCK ARE PROVIDED WITH

THIS PACKET. STAINLESS STEEL UNITS
COME STANDARD WITH LOCKS. OVERLAY
PANEL READY UNITS WILL NOT BE EQUIPPED
WITH LOCKS.

NOTE: ANTI-TIP BRACKETS KIT AND DOOR STOP

ARE PACKED WITHIN THE TOE KICK WHICH
IS TAPED TO THE BACK OF THE UNIT. IF
THEY ARE NOT IN THE TOE KICK THEY WILL
BE PACKAGED INSIDE THE UNIT WITH THIS
M A NUAL.

C

D

PACKING MATERIAL

TOE KICK IS ATTACHED

TO BACK OF UNIT

FOR ANY MISSING OR BROKEN PARTS.
PLEASE CONTACT THE DEALER FROM
WHOM YOU PURCHASED THE UNIT.

15 & 24 INCH SERVICE MANUAL

7

LEVELING THE UNIT

NOTE: PROPER LEVELING OF YOUR TRUE UNIT

IS CRITICAL TO OPERATING SUCCESS.
EFFECTIVE CONDENSATE REMOVAL AND
DOOR OPERATION WILL BE EFFECTED BY
LEVELING.

STEP 1 - Move the unit near the final location.

STEP 2 - Level your unit from the interior floor front

to back and side to side with a level. If the
refrigerator is not level adjust the stainless
steel leg levelers. The leg levelers can be
adjusted by turning CCW to reach the desired
leveling height as shown in the illustration
below.

STEP 3 - Free plug and cord from back of unit.

STEP 4 - The unit should be placed close enough to

the electrical supply so that extension cords
are never used. Plug unit directly into the
wall outlet.

STEP 5 - Once installed in final location, re verify level

and make final adjustments to the front legs.

STEP 6 - Insert the toe kick on the clips (A) Version or

magnets (B) version.

TRUE RESIDENTIAL

8

®

ANTI-TIP BRACKET INSTALLATION

3.23.17 AC

TRUE RESIDENTIAL

®

211354

PRODUCT ADVISEMENT

KIT INCLUDES

• 2 Anti-tip brackets

• 4 Concrete screws (blue)

• 4 Wood screws (brass)

TOOLS REQUIRED

• Power drill

• Measuring Tape

IMPORTANT!

ALL FREE STANDING DRAWER (TUR-24D) OR STACKED UNITS MUST HAVE ANTI-TIP BRACKETS INSTALLED.

TIP-OVER HAZARD: A CHILD OR ADULT CAN TIP THE REFRIGERATOR. FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT
IN PROPERTY OR BODILY HARM.

BEFORE MOVING UNIT TAKE PRECAUTIONS TO PROTECT THE FLOOR.

Read all installation instructions first. Install the anti-tip brackets to hold both rear legs of the unit. Follow these steps
to secure the brackets to the floor before moving the unit into final operating position.

Contact a qualified floor installer for the best procedure of drilling mounting holes through your type of floor.

STEP 1

Back

3/16 "

22

Front

ANTI-TIP BRACKET (TOP VIEW)

1

18

27/ 32"

1/2"

Determine the location of the unit. The anti-tip
brackets will be installed 27/32" inset from the back
and sides of the unit. You can also measure 18 1/2"
from the front of the unit (not including the lower
louver grill). Using the bracket as a template, mark
the holes for drilling.

15 & 24 INCH SERVICE MANUAL

9

ANTI-TIP BRACKET INSTALLATION

3.23.17 AC

TRUE RESIDENTIAL

®

211354

PRODUCT ADVISEMENT

2

STEP 2

To mount the anti-tip bracket to wood floor, drill pilot
holes for each of the bracket holes. To mount the
anti-tip bracket to concrete or ceramic floor use a
masonry bit to drill pilot holes. Align anti-tip bracket
holes with the holes in the floor. Fasten anti-tip
bracket with screws provided using the brass colored
screw for wood, or blue colored masonry screw for
concrete.

STEP 3

Move unit into final position making sure rear leveling
legs slide into the anti-tip brackets.

3

TRUE RESIDENTIAL

10

®

DOOR STOP INSTALLATION

INSTRUCTIONS FOR STAINLESS STEEL MODELS

ALL UNITS ARE PROVIDED WITH AN OPTIONAL DOOR STOP. WHEN INSTALLED, THE DOOR STOP WILL PREVENT
DAMAGE TO SURROUNDING CABINETS BY RESTRICTING THE DOOR FROM OPENING PAST APPROXIMATELY 120º
WITH A STANDARD HINGE OR 90º WITH AN 90º HINGE (OPTIONAL).

Hinge

Door stop

STEP 1

To install the door stop, use the 2 screws provided
and secure the bracket to the bottom of the door on
the same side as the hinge.

(OPTIONAL) 90° HINGE INSTALLATION

INSTRUCTIONS FOR STAINLESS STEEL MODELS

KIT INCLUDES

• 90º Hinge (left or right)

• Door stop bracket (left or right)

TOOLS REQUIRED

• 3/8" Socket wrench

• Phillips screwdriver

Door stop

installed

1

STEP 1

Remove toe kick.

15 & 24 INCH SERVICE MANUAL

11

(OPTIONAL) 90° HINGE INSTALLATION

INSTRUCTIONS FOR STAINLESS STEEL MODELS

STEP 2

WARNING: Support the door while removing hinge.

Door is heavy and weight will cause it to drop if not
supported.

Remove 2 3/8" bolts to detach 120º door hinge
(standard).

2a

3

2b

STEP 3

Slowly remove door from unit by sliding down from
top hinge.

STEP 4

Install door stop using screws already installed.
Reinstall door by sliding up into top hinge.

4a

TRUE RESIDENTIAL

12

4b

®

(OPTIONAL) 90° HINGE INSTALLATION

INSTRUCTIONS FOR STAINLESS STEEL MODELS

STEP 5

Install 90º hinge with the 2 3/8" bolts that you
removed. Note: Do not tighten screws all the way
until door adjustments have been made.

5

STEP 6

Align door with lock latch and light switch.
Tighten screws.

6

15 & 24 INCH SERVICE MANUAL

13

DRAWER DEPTH ADJUSTMENT

1

STEP 1

Loosen the left and right screws that mount the drawer
frame to the slide. See Image 1.

2

STEP 2

To bring the drawer out to the front of the unit, pull the
drawer out where the tab is seated towards the rear of the
unit. See Image 2.

STEP 3

Hold drawer position and tighten screws.

TRUE RESIDENTIAL

14

®

DRAWER FRONTS ON TRUE DRAWER REFRIGERATORS ADJUSTMENT

STEP 1 - Open the drawer that needs adjustment.

STEP 2 - Locate the two Phillips screws on each side of the drawer frame.

See figure 1

STEP 3 - Loosen the 2 screws on each side to get left to right movement

on the drawer front.

STEP 4 - Hold adjustment in place and re tighten the screws back down.

FIGURE 1.

DRAWER GLIDES ON TRUE DRAWER REFRIGERATORS ADJUSTMENT

STEP 1 - Remove screws (one on each side) on top of drawers at front.

STEP 2 - Remove drawers (lift out from the front)

STEP 3 - Loosen the two screws on the glide

STEP 4 - Use bottom screw to adjust glide
STEP 5 - Tighten side screws

STEP 6 - Replace drawer by aligning into tabs (in back)

STEP 7 - Reinsert screws in front

1

3

6

2

4

5

7

15 & 24 INCH SERVICE MANUAL

15

DOOR REMOVAL

STEP 1 - Remove the louver grill from the bottom of

the unit by simply pulling the grill toward the
front of the unit. See image 1.

STEP 2 - Support the door with your knee or a block to

prevent the door from falling to the ground
when the bolts are removed.

STEP 3 - Remove the two 3/8-inch bolts from the

bottom hinge using a ratchet and socket. See
image 2A and 2B.

STEP 4 - Pull the hinge out of the bottom of the door

and set it aside.

1

STEP 5 - Once these two bolts are removed, slightly

open the door, still supporting the weight
with your knee or a block, slowly allow the
door to drop down off the top hinge pin. See
image 3.

STEP 6 - Reinstall door by reversing sequence.

2A

3

2B

TRUE RESIDENTIAL

16

®

STAINLESS STEEL & STAINLESS GLASS DOOR ADJUSTMENTS

ALL VERSIONS

PLEASE NOTE: DOOR HINGING ON TRUE PRODUCTS ARE NOT INTERCHANGEABLE. IT IS NEVER RECOMMEND TO

ATTEMPT MOVING DOOR HINGING TO THE OPPOSITE SIDE THE UNIT WAS BUILT WITH. THIS MAY CAUSE SERIOUS

DAMAGE AND HARM.

STEP 1 - Make sure the unit is completely level and

in place.

STEP 2 - Remove the bottom louver grill from the

unit. See image 1.

NOTE: A version grills are clipped in and B

version grills are held on with magnets.

1

STEP 3 - With the door shut loosen the two 3/8-inch

bolts. See image 2.

STEP 4 - While supporting the door, open slightly

and shift the door up or down on the
handle side. See image 3.

STEP 5 - Hold the adjusted door and retighten

the two 3/8 inch bolts until very snug to
prevent the adjustment from coming loose.

STEP 6 - Test the door by opening and closing,

making sure the door is not hitting the lock
latch (image 4a) and ensure that the door
makes contact with the door switch (image
4b).

STEP 7 - Re-install the louver grill.

2

3

4A 4B

15 & 24 INCH SERVICE MANUAL

17

OVERLAY PANEL & OVERLAY PANEL GLASS DOOR ADJUSTMENTS

PLEASE NOTE: DOOR HINGING ON TRUE PRODUCTS ARE NOT INTERCHANGEABLE. IT IS NEVER RECOMMEND TO
ATTEMPT MOVING DOOR HINGING TO THE OPPOSITE SIDE THE UNIT WAS BUILT WITH. THIS MAY CAUSE SERIOUS
DAMAGE AND HARM.

DOOR ADJUSTMENT UP AND DOWN - ALL VERSIONS

STEP 1 - Make sure the unit is completely level and

in place.

STEP 2 - Remove the bottom louver grill from the

unit. See image 1.

NOTE: A version grills are clipped in and B

version grills are held on with magnets.

1

STEP 3 -

STEP 4 - While supporting the door, open slightly

STEP 5 - Hold the adjusted door and retighten

DOOR ADJUSTMENT LEFT TO RIGHT

STEP 1 - Loosen the top and bottom Phillips screws

STEP 2 - Shift the entire door left or right to align to

With the door shut loosen the two 3/8-inch

bolts. See image 2 and 3.

and shift the door up or down on the
handle side. See image 4.

the two 3/8 inch bolts until very snug to
prevent the adjustment from coming loose.

(do not remove screws unless you want to
remove the door). See image 5 and 6.

desired position. See image 7.

2

3

4

STEP 3 - While holding the door in position re-tighten

the upper and bottom screws to hold new
adjustment.

STEP 4 - To adjust the upper only, loosen the two

screws on the upper hinge bracket and shift
door accordingly. See image 5.

STEP 5 - To adjust the bottom only, loosen the two

screws on the bottom hinge bracket and
shift door accordingly. See image 6.

TRUE RESIDENTIAL

18

®

65

7

WINE SHELVING ADJUSTMENT

The glide out wine shelves in TBC, TWC and TWZ-DZ
models consist of 3 pieces. These pieces are the wire
wine rack and 2 mounting bracket/glide assemblies
(one for the hinge side and one for the non-hinge side).

To remove the wine shelf, pull up on the front of the
wine rack and it will separate from the two mounting
brackets. The two mounting brackets may now be
removed from the pilasters by lifting straight up then
pulling the brackets out of the pilasters.

NOTE: WHEN REINSTALLING THE BRACKETS,
THE BRACKET WITH THE LARGER VIBRATION
BUMPER MUST BE INSTALLED ON THE SAME

SIDE OF THE CABINET AS THE DOOR HINGE.
WHEN REINSTALLING THE WINE RACK, BE
SURE THAT THE BACK OF THE RACK HOOKS

UNDERNEATH THE TAB ON THE GLIDE.

The tab on the front of the glide must also fit securely
in the gap between the handle and the rack (see
illustration). If the fit is too tight, you may need to
loosen the screws on the back of the handle to increase
the gap.

The wine shelves are held securely by the anti-vibration
bumpers. If there is too much play side-to-side, tighten
the bumpers against the compartment walls by rotating
with your fingers.

GLASS SHELVING ADJUSTMENT

The glide out glass shelves are already attached
to the mounting bracket/glide assemblies.
To install the glass shelves insert mounting
brackets into pilasters.
To remove the glass shelves, simply lift straight
up then pull the brackets out of the pilasters.

ANTI-VIBRATION
BUMPERS

15 & 24 INCH SERVICE MANUAL

19

4.10.17 AC

TRUE RESIDENTIAL

®

981897

PRODUCT ADVISEMENT

STACKING KIT INSTRUCTIONS

TOOLS REQUIRED

• 5/16-inch socket and ratchet

• Level

• Floor proctor

• Extra person(s)

KIT INCLUDES

• (1) Louver grill. Note: A version models will use

clips to mount the grill. B version models will
have magnets.

• (2) stacking brackets

• (4) 5/16 inch screws

• Anti-tip bracket kit

STACKING

BRACKETS

1

• Uncrate and secure doors, shelving, and drawers to prevent damage when handling the units.

• Install the anti-tip bracket per instructions (see separate).

• Verify the anti-tip brackets are properly located by trial fitting the lower unit in place. If so pull the unit back out

to prepare Step 1.

PROTECT THE FLOOR, SURROUNDING CABINETRY AND THE UNITS AT ALL TIMES.

THIS PROCEDURE REQUIRES ASSISTANCE FROM EXTRA PERSON(S).

STEP 1

Carefully lift the top cabinet and place on the lower

cabinet making sure the upper unit is flush with the

lower unit’s sides and back.

STEP 2

Install the rear stacking brackets using the provided

5/16-inch screws. NOTE: DO NOT TIGHTEN THE

BRACKETS ALL THE WAY UNTIL LATER STEPS.

See Image 1.

LED LIGHTING

• The lighting in all True Residential

• Each compartment has 1 or 2 LED modules that are powered by a driver.

• The modules have an IC chip in them to change their color. A short power interruption is the trigger to

change the color.

• If the colors are ever out of sync, they can be reset by changing the color 10 times in a row. This will reset

all modules back to white.

• The LED modules run off a 10V DC power supply which is located next to the microprocessor control. The

WHEN LIGHTS ARE SET TO GO OFF WHEN THE DOOR IS SHUT, 30 SECONDS LATER THE LED’S WILL HAVE A SPLIT
SECOND FLASH. THIS IS BY DESIGN TO ALLOW THE LED’S TO RELEASE STORED ELECTRICITY. IT WILL DO THIS
ONLY ONE TIME, EACH TIME THE DOOR IS SHUT.

IF THE LIGHTS ARE SET TO STAY ON EVEN WHEN THE DOOR IS SHUT, THIS WILL NOT OCCUR.

power supply has 115V AC incoming, then 10V DC outgoing.

®

Undercounter Models is an LED module system.

RED AND BLUE

10V DC

BLACK AND WHITE

120V AC

TRUE RESIDENTIAL

20

®

4.10.17 AC

TRUE RESIDENTIAL

®

981897

STACKING KIT INSTRUCTIONS

PRODUCT ADVISEMENT

KIT INCLUDES

• (1) Louver grill. Note: A version models will use

clips to mount the grill. B version models will
have magnets.

• (2) stacking brackets

TOOLS REQUIRED

• 5/16-inch socket and ratchet

• Level

• Floor proctor

• Extra person(s)

• (4) 5/16 inch screws

• Anti-tip bracket kit

PROTECT THE FLOOR, SURROUNDING CABINETRY AND THE UNITS AT ALL TIMES.

• Uncrate and secure doors, shelving, and drawers to prevent damage when handling the units.

• Install the anti-tip bracket per instructions (see separate).

• Verify the anti-tip brackets are properly located by trial fitting the lower unit in place. If so pull the unit back out

to prepare Step 1.

THIS PROCEDURE REQUIRES ASSISTANCE FROM EXTRA PERSON(S).

STEP 1

Carefully lift the top cabinet and place on the lower

STACKING

BRACKETS

cabinet making sure the upper unit is flush with the

lower unit’s sides and back.

STEP 2

Install the rear stacking brackets using the provided

5/16-inch screws. NOTE: DO NOT TIGHTEN THE

BRACKETS ALL THE WAY UNTIL LATER STEPS.

See Image 1.

1

15 & 24 INCH SERVICE MANUAL

21

4.10.17 AC

TRUE RESIDENTIAL

®

981897

PRODUCT ADVISEMENT

STACKING KIT INSTRUCTIONS

STEP 3

Level the upper and lower unit front to back and left

to right by placing a small level on the interior floor.

See Image 2.

STEP 4

Now tighten all (4) 5/16-inch screws to secure the

brackets to the units.

STEP 5

Carefully put the stacked units in their final setting.

Make sure the bottom unit’s rear legs are securely

locked into the anti-tip brackets.

STEP 6

Install supplied louver grill on upper unit. See Image 3.

2

3

24 INCH

TRUE RESIDENTIAL

22

®

TECHNICAL DATA

s o f t w a r e I n f o r m a t I o n a n D st a r t u P m o D e

s e q u e n C e o f o P e r a t I o n

u s e r I n t e r f a C e C o m m a n D s

23 - 44

D e f r o s t

e v a P o r a t o r C o v e r r e m o v a l

e v a P o r a t o r s e C t I o n l a y o u t

P r o B e v a l u e s

e v a P o r a t o r f a n D r I v e r

C o n t r o l B o a r D r e P l a C e m e n t & m o D e l s e l e C t s e q u e n C e o f o P e r a t I o n

w I r I n g D I a g r a m s

15 & 24 INCH SERVICE MANUAL

23

SOFTWARE INFORMATION AND START UP MODE

All software codes will be displayed every time the machine is powered up (power must be disconnected)
– the software code will be displayed for a minimum of 25 seconds. (Does not apply to ice machine or
uprights)

1) Software Version: 66 (does not apply to ice machine or uprights)

• Only used for A version models (Model number will finish with the letter “A”)

Example:

º

F

º

C

ICE

2) Software Code: 73 (does not apply to ice machine or uprights)

• Only used for B version models (Model number will finish with the letter “B”)

• This software code was replaced by software version: 94

• If a control board has software code “73” and fails, will be replaced with new software version “94”

MODEL

SIZE

HINGE

DOOR

EDITION

TWC - 24DZ - L - SG - A

TRUE WINE

CABINET

24”

DUAL ZONE

HINGED ON LEFT

HANDLE ON RIGHT

STA INLESS

GLASS

Example:

º

F

º

C

ICE

MODEL

SIZE

HINGE

DOOR

EDITION

TWC - 24DZ - L - SG - B

TRUE WINE

CABINET

24”

DUAL ZONE

HINGED ON LEFT

HANDLE ON RIGHT

STA INLESS

GLASS

SECOND

REVISION

3) Software Code: 94 (does not apply to ice machine or uprights)

• Currently used on B version models (Model number will finish with the letter “B”)

• Software version “94” has a hard-reset option. A hard reset will eliminate the need to disconnect
power to the unit to verify software and program the model when needed.

Example:

º

F

º

C

ICE

MODEL

SIZE

HINGE

DOOR

EDITION

TWC - 24DZ - L - SG - B

TRUE WINE

CABINET

24”

DUAL ZONE

HINGED ON LEFT

HANDLE ON RIGHT

STA INLESS

GLASS

SECOND

REVISION

HARD-RESET PROCEDURE

In order to perform a hard-reset of the machine please follow these steps:

i. Turn the unit Off using the power button (hold for 3 seconds)

ii. Press and hold the +

iii. A successful hard-rest will show a 3-digit code for 25 seconds followed by “94” for 20 seconds. After
a total of 45 seconds, compartment temperature will be displayed.

HARD-RESET FEATURE MAY NOT FUNCTION FOR ALL B VERSION UNITS. IF THE
DISPLAY CONTINUES TO SHOW “OFF” AFTER PERFORMING A HARD-RESET.

TRUE RESIDENTIAL

24

®

SEQUENCE OF OPERATION

The operating system consist of these components.

ELECTRONIC CONTROL BOARD – Main control of the entire unit’s functionality. The control board is located in the

interior ceiling for all models except (TUF & DZ) TUF board location is behind the rear back cover. DZ boards are
located in the interior ceiling of the center mullion.

COMPRESSOR – Variable speed and single speed compressors depending on version. Please see page 47

CONDENSER FAN MOTOR – Located behind the rear panel of the unit. The condenser fan should always run while the

compressor is running.
24" units - 120VAC condenser fan motor
15" units - 10VDC condenser fan motor

EVAPORATOR FAN MOTOR – Located behind the interior back cover. The evaporator fan motor will cycle off with the

refrigeration cycle on refrigerators. On wine units the evaporator fan will run all the time. The fan will always shut off
when the door is opened.

ONE COMPARTMENT PROBE (Labeled with two blue stripes on "A"versions) (solid blue on "B"versions) – this sensor

controls the cut in and cut out of the refrigeration system.

ONE EVAPORATOR PROBE (Labeled with 1 blue stripe on "A"versions) ( solid blue on "B"versions) – this sensor

controls the defrost function. (Described in detail in the "Defrost" section of this manual)

When power is supplied, the LCD will show a software version code for a minimum of 25 seconds. This is for
manufacturing process only.

From the “off” to the "on" position using the interface power button, the following will happen:

1. Interior LED lights will illuminate.

2. Display readout will show interior cabinet temp based off the compartment probe.

3. After a 2-minute delay the refrigeration system will start.

The refrigeration system (compressor, condenser fan motor, evaporator fan motor) will run until cut out temperature is
reached.

PLEASE NOTE: THE CUT OUT TEMPERATURE IS BASED ON THE COMPARTMENT PROBE, NOT THE DISPLAY
TEMPERATURE. OUR DISPLAY TEMPERATURE IS A CALCULATION AND IS NOT REFLECTING REAL TIME TEMP.

Once the cut out temperature is reached the we will shut the refrigeration system off.

The cycle will repeat when the compartment probe tells the control board to cut back in.

NOTE: THE CONTROL HAS A PRESET 7 MINUTE ANTI SHORT CYCLE.

DUAL ZONE

The TWC-24DZ has two zones which can be independently set for different temperatures.
Each zone has its own display, evaporator coil, evaporator fan and probes.
The zones share the compressor, condenser coil, and condenser fan motor.
Refrigerant is directed to either zone through a bi-stable solenoid valve.
Only one zone can be cooled at a time.
The control continually checks to see which zone is demanding for cooling. If both zones need cooling, the control will
switch from cooling one zone to the other every 20 minutes.

NOTE: THE UPPER ZONE HAS PRIORITY WHEN THE CABINET IS FIRST POWERED ON AND WILL ONLY START TO
COOL THE LOWER AFTER THE UPPER ZONE SET POINT HAS BEEN MET (ONLY ON START UP)

15 & 24 INCH SERVICE MANUAL

25

USER INTERFACE COMMANDS ON TRUE PRECISION CONTROL

08 .10.17 SB

TRUE RESIDENTIAL

®

206582

CONTROL COMMANDS

KE Y

COMBINATIONS

LCD READOUTS DESCRIPTION

“B” Revision ContRol BoARd 73

tWC-24/tBC-24/tUR-24/tUR-24d

08 .10.17 SB

TRUE RESIDENTIAL

®

206582

CONTROL COMMANDS

KE Y

COMBINATIONS

LCD READOUTS DESCRIPTION

Software Version

73ºC

º

F

ICE

º

C

Code is displayed for 45 seconds when power is
supplied to the unit.

Off / On

º

F

ICE

º

C

Power unit off / on.

Set Point

º

F

ICE

º

C

Press to display set point.

Decrease Set Point

º

F

ICE

º

C

Press to decrease set point.
Minimum set points:
33ºF - Refrigerators
40ºF - Wine units

Increase Set Point

º

F

ICE

º

C

Press to increase set point.
Maximum set points:
47ºF - Refrigerators
65ºF - Wine units

Accent Light

º

F

ICE

º

C

Turn accent light on/off. When icon is displayed, light
remains on at all times.

Color

Switch LED colors - Slowly press and release to
switch between 14 colors.

Alarm

º

F

ICE

º

C

Set high temperature and door ajar alarm.
Door ajar - 7 minutes.
High Temps (1 consecutive hour):
50°F - Refrigerator
70°F - Wine Cabinet

+

Temperature Scale

º

F

ICE

º

C

Toggle between °C / °F.

“B” Revision ContRol BoARd 73

tWC-24/tBC-24/tUR-24/tUR-24d

08 .10.17 SB

TRUE RESIDENTIAL

®

206582

CONTROL COMMANDS

+

Lock

º

F

ICE

º

C

Lock / Unlock Keypad.

+

Sabbath Mode

º

F

ICE

º

C

Sets Sabbath mode – Star K certified. Kosher
compliant.

+

Showroom Mode

º

F

ICE

º

C

Displays set point.
Lights are fully functional.
Deactivates refrigeration system.
Disables power off function.

KE Y

COMBINATIONS

LCD READOUTS DESCRIPTION

“B” Revision ContRol BoARd 94

tWC-24/tBC-24/tUR-24/tUR-24d

®

On/Off (hold 3 seconds)

TRUE RESIDENTIAL

26

®

Press and release to show set point for 5 seconds.
After 5 seconds the display will resort back to
average box temp.
NOTE: 15 inch units use "up" or "down" button

Press to decrease set point.
Minimum set points:
33˚F - Refrigerators
40˚F - Wine Units

-4˚ F - Freezer

Press to increase set point.
Maximum set points:
47˚F - Refrigerators
65˚F - Wine Units

-4˚ F - Freezer

Press and release the button combination to start the color cycle.
Press and release the button combination again to choose the
desired color.
NOTE: Dual Zone models will use "mode + light"
NOTE: 15 inch models will use "light + up arrow"

NOTE: "A" version has 3 colors.

Activates / deactivates alarm

NOTE: 15 inch units use "POWER + DOWN"

24 inch models only

NOTE: 15 inch units use "light" button

Display set point.
Lights are fully functional.
Deactivates refrigeration system.
Disables power off function.
NOTE: 15 inch units use "light" button

08 .10.17 SB

TRUE RESIDENTIAL

®

206582

CONTROL COMMANDS

+

Lock

º

F

ICE

º

C

Lock / Unlock Keypad.

+

Sabbath Mode

º

F

ICE

º

C

Sets Sabbath mode – Star K certified. Kosher
compliant.

+

Showroom Mode

º

F

ICE

º

C

Displays set point.
Lights are fully functional.
Deactivates refrigeration system.
Disables power off function.

+

Hard Reset (hold 3 sec)

To initiate hard reset, unit must be in the “off”
position. This feature is used to reset the control.

Refrigeration Error

º

F

ICE

º

C

Unit has not reached desired set point after 15 hours
of run down. Service recommended. Power unit off
and back on to reset.

Compartment Probe

Failure Only

º

F

ICE

º

C

Compartment probe has failed.

Evaporator Probe Failure

Only

º

F

ICE

º

C

Evaporator probe has failed.

Both Probe Failure

º

F

ICE

º

C

Compartment and evaporator probes have failed.
Change both and reset power to the control board to
clear the error message. Unit will run 3 min. on and 3
min. off until probes are changed.

High Temperature Alarm

Set high temperature alarm.
High Temps (1 consecutive hour):
50°F - Refrigerator
70°F - Wine Cabinet

Door Ajar Alarm Door is ajar (7 minutes)

KE Y

COMBINATIONS

LCD READOUTS DESCRIPTION

“B” Revision ContRol BoARd 94

tWC-24/tBC-24/tUR-24/tUR-24d

º

F

ICE

º

C

º

F

ICE

º

C

º

F

ICE

º

C

USER INTERFACE COMMANDS ON TRUE PRECISION CONTROL

08 .10.17 SB

TRUE RESIDENTIAL

®

206582

CONTROL COMMANDS

KE Y

COMBINATIONS

LCD READOUTS DESCRIPTION

“B” Revision ContRol BoARd 73

tWC-24/tBC-24/tUR-24/tUR-24d

CONTROL COMMANDS

04 .10.17 AC

TRUE RESIDENTIAL

®

206582

Compartment Probe

Failure (Zone 2)

º

F

ICE

º

C

Compartment probe has failed in Zone 2.

Evaporator Probe Failure

(Zone 2)

º

F

ICE

º

C

Evaporator probe has failed in Zone 2.

Both Probe Failure

(Zone 2)

º

F

ICE

º

C

Compartment and evaporator probes have failed in
Zone 2. Change both and reset power to the control
board to clear the error message.

KE Y

COMBINATIONS

LCD READOUTS DESCRIPTION

“B” Revision ContRol BoARd 94

tWC-24dZ

08 .10.17 SB

TRUE RESIDENTIAL

®

206582

CONTROL COMMANDS

KE Y

COMBINATIONS

LCD READOUTS DESCRIPTION

Software Version

94ºC

º

F

ICE

º

C

Code is displayed when power is supplied to the unit or a
hard-reset is done.

Off / On (hold 3 sec)

º

F

ICE

º

C

Power unit off / on.

Set Point

º

F

ICE

º

C

Press to display set point.

Decrease Set Point

º

F

ICE

º

C

Press to decrease set point.
Minimum set points:

-4ºF

Increase Set Point

º

F

ICE

º

C

Press to increase set point.
Maximum set points:
4ºF

+

Initiate Manual Defrost

Defrost will terminate at the following temperature or time.
Termination temperature:
40ºF
Termination time:
30 minutes

“B” Revision ContRol BoARd 94

tUF-24

08 .10.17 SB

TRUE RESIDENTIAL

®

206582

CONTROL COMMANDS

+

Lock

º

F

ICE

º

C

Lock / Unlock Keypad.

+

Sabbath Mode

º

F

ICE

º

C

Sets Sabbath mode – Star K certified. Kosher
compliant.

+

Showroom Mode

º

F

ICE

º

C

Displays set point.
Lights are fully functional.
Deactivates refrigeration system.
Disables power off function.

+

Hard Reset (hold 3 sec)

To initiate hard reset, unit must be in the “off”
position. This feature is used to reset the control.

Refrigeration Error

º

F

ICE

º

C

Unit has not reached desired set point after 15 hours
of run down. Service recommended. Power unit off
and back on to reset.

Compartment Probe

Failure Only

º

F

ICE

º

C

Compartment probe has failed.

Evaporator Probe Failure

Only

º

F

ICE

º

C

Evaporator probe has failed.

Both Probe Failure

º

F

ICE

º

C

Compartment and evaporator probes have failed.
Change both and reset power to the control board to
clear the error message. Unit will run 3 min. on and 3
min. off until probes are changed.

High Temperature Alarm

Set high temperature alarm.
High Temps (1 consecutive hour):
50°F - Refrigerator
70°F - Wine Cabinet

Door Ajar Alarm Door is ajar (7 minutes)

KE Y

COMBINATIONS

LCD READOUTS DESCRIPTION

“B” Revision ContRol BoARd 94

tWC-24/tBC-24/tUR-24/tUR-24d

º

F

ICE

º

C

º

F

ICE

º

C

º

F

ICE

º

C

Initiate Manual Defrost

(freezer only)

®

To initiate hard reset, unit must be in the "off" position.
This feature is used to reset the control.
NOTE: 15 inch units use "light" button

NOTE: 94V only

Note: 94V only.

Defrost will terminate at the following temperature or time.
Termination temperature: 40˚F
Termination time: 30 minutes

NOTE: 94 V only

Evaporator Probe Failure Only

Compartment Probe

Compartment Probe Failure

(Upper zone on DZ)

Failure

Only

Evaporator Probe

Failure

(Upper zone on DZ)

Compartment and
Evaporator Probes

(Upper zone on DZ)

Failed

Compartment Probes

Failure DZ Only

(Lower zone)

Evaporator Probe

Failure DZ Only

(Lower zone)

Compartment and

Evaporator Probes

Failed DZ Only

(Lower zone)

Evaporator probe failure. change probe and interrupt power to
reset. NOTE: 94 V ONLY

Cycle off evaporator probe using a 2˚ degree offset

Compartment probe failure. change probe and interrupt power to
reset. NOTE: 94 V ONLY

NOTE: 94 V only

Each time the unit calls for cooling, we will run the
evaporator fan for 10 minutes before running the
compressor.

NOTE: 94 V only

High temp alarm

Unit will run in safe mode as follows:

50 degrees F / 1 hour - refrigerator

10 minutes off / 10 minutes evaporator fan only

70 degrees F / 1 hour - wine cabinet

10 minutes fan and compressor

32 degrees F / 1 hour - freezer

Cycle repeats until both probes are changed

NOTE: 94V only

NOTE: 94 V only

Set high temperature alarm.
High Temps (1 consecutive hour):
50˚F - Refrigerator / 70˚F - Wine Cabinet

NOTE: 94V only

NOTE: 94 V only

compartment probe in bottom zone has failed. Change probe and
interrrupt power to reset.
NOTE:94V ONLY. DUAL ZONE ONLY.

NOTE: 94 V only
Cycle off evaporator probe using a 2˚ degree offset

NOTE: 94 V only

Each time the unit calls for cooling, we will run the
evaporator fan for 5 minutes before running the
compressor.

NOTE: 94 V only

Unit will run in safe mode as follows:
10 minutes off / 10 minutes evaporator fan only
10 minutes fan and compressor
Cycle repeats until both probes are changed
NOTE: 94 V only

time.

15 & 24 INCH SERVICE MANUAL

27

DEFROST SEQUENCE OF OPERATION

08.10 .17 SB

®

206582

KEY

COMBINATIONS

LCD READOUTS DESCRIPTION

Software Version

94ºC

º

F

ICE

º

C

Code is displayed when power is supplied to the unit or a
hard-reset is done.

Off / On (hold 3 sec)

º

F

ICE

º

C

Power unit off / on.

Set Point

º

F

ICE

º

C

Press to display set point.

Decrease Set Point

º

F

ICE

º

C

Press to decrease set point.
Minimum set points:

-4ºF

Increase Set Point

º

F

ICE

º

C

Press to increase set point.
Maximum set points:
4ºF

+

Initiate Manual Defrost

Defrost will terminate at the following temperature or time.
Termination temperature:
40ºF
Termination time:
30 minutes

“B” Revision ContRol BoARd 94

tUF-24

08.10 .17 SB

®

206582

KEY

COMBINATIONS

LCD READOUTS DESCRIPTION

Software Version

94ºC

º

F

ICE

º

C

Code is displayed when power is supplied to the unit or a
hard-reset is done.

Off / On (hold 3 sec)

º

F

ICE

º

C

Power unit off / on.

Set Point

º

F

ICE

º

C

Press to display set point.

Decrease Set Point

º

F

ICE

º

C

Press to decrease set point.
Minimum set points:

-4ºF

Increase Set Point

º

F

ICE

º

C

Press to increase set point.
Maximum set points:
4ºF

+

Initiate Manual Defrost

Defrost will terminate at the following temperature or time.
Termination temperature:
40ºF
Termination time:

“B” Revision ContRol BoARd 94

tUF-24

1) 7-minute anti-short cycle has elapsed.

2) Compartment probe reaches the cut-in point.

3) Control board checks the evaporator coil temperature probe. If the evaporator coil probe is below 38ºF the
evaporator fan will start and run while the compressor and condenser fan remain off.

4) Once the evaporator coil probe reaches 38 °F, the control will allow the compressor and condenser fan motor
to run until cut out temperature is reached.

5) This process will be repeated upon each call for cooling.

NOTE: – Wine units run the evaporator fan(s) all the time.

FREEZER MODELS ONLY

1) Three methods of initiating defrost:

a) the control reached the max compressor run time (60 hours)

b) the evaporator probe has reached -25˚F.

C) initate manual defrost by pressing and holding for 3 seconds

NOTE: – The control will prohibit defrost the first 4 hours of plugging the unit in.

3) Compressor, evaporator fan and condenser fan shut off during defrost.

4 ) The drain tube heater, evaporator coil heater and drain trough heater will energize until time or temperature
is met.
a) Maximum defrost run time is 30 mins.
b) termination temperature is 40 degrees based off evaporator probe temperature.

5) While in defrost, the display will continue to show tempature which is filtered and will not reflect normal
flucuation.

NOTE: – The only time the display will show "def" is when a manual defrost is intiated by pressing

and holding

6) Once the defrost cycle ends, the control board will delay the following components:
a) Delay compressor after defrost - 2 minutes.
b) Delay evaporator fan motor after defrost - 6 minutes.

TRUE RESIDENTIAL

28

®

EVAPORATOR COVER REMOVAL

A VERSION

• Remove all shelves from the unit.

• Remove two Phillips screws on upper part of evaporator cover.

• Slide cover down and out.

15 & 24 INCH SERVICE MANUAL

29

EVAPORATOR COVER REMOVAL

B VERSION

• Remove all shelves from the unit.

• Remove two Phillips screws on upper part of evaporator cover. See Picture 1

• Slide the cover down and pull out.

NOTE: YOU MAY NEED TO LIFT UP ON THE LEFT AND RIGHT SHELF STANDARD WITH A SCREWDRIVER.
PLEASE SEE PICTURE 2.

Loosening the shelf standard may be necessary if lifting wasn’t successful. Remove the top gray cap and
loosen the screw, do not remove the screw. See Picture 3.

PICTURE 1 PICTURE 2

PICTURE 3

TRUE RESIDENTIAL

30

®

EVAPORATOR SECTION LAYOUT

A VERSION

EVAPORATOR FAN MOTOR AND BLADE

COMPARTMENT PROBE

(2 BLUE STRIPES)

EVAPORATOR PROBE (1 BLUE STRIPE)

EVAPORATOR COIL

15 & 24 INCH SERVICE MANUAL

31

EVAPORATOR SECTION LAYOUT

B VERSION

EVAPORATOR FAN MOTOR
EVAPORATOR FAN MOTOR DRIVER

BLUE PROBE – DEFROST ASSIST PROBE

BLACK PROBE – CUT IN & CUT OUT

T (F°) Ω
14° 55.3K
23° 42.3K
32° 32.6K
41° 25.3K
50° 19.9K
59° 15.7K
68° 12.5K
77° 10K
86° 8K
95° 6.5K
104° 5.3K

EVAPORATOR FAN DRIVERPROBE VALUES

The evaporator fan motor driver is located directly next to the evaporator fan.

The motor driver will have 120V AC coming in and 12V DC going to the motor.

120V AC

12V DC

TRUE RESIDENTIAL

32

®

CONTROL BOARD REPLACEMENT & MODEL SELECT SEQUENCE OF OPERATION

11.17.16 • SB

TRUE RESIDENTIAL

®

Control Board Replacement & Model Select Sequence of Operation

964208

TRUE RESIDENTIA

A

SINGLE ZONE ONLY

B

SINGLE ZONE ONLY

The control is located in the interior ceiling on single zone models (see images A & B).
Control is located in the lower compartment ceiling of dual zone models (see image C).
Remove Phillips screws that hold the control board cover.

Power should always be disconnected from the unit prior to changing the control board.
This will require unplugging the unit and / or shutting the breaker off.

DO NOT apply power to the unit until you are ready to program per table below.

MODEL SELECT SEQUENCE OF OPERATION

Since the same control board is used on multiple models it is necessary to set up the
control to the proper code for the model you are working on.

1. Reconnect power to the unit.

2. Once power is supplied, the control board will display a 3-digit code.

3. Within 30 seconds of applying power, press and hold the power button until you see
“0” or “000”.

4. Release the power button and use the up arrow to scroll up until you find the code for
the model you are working on. See table below.

5. Wait for the display to time out until the compartment temperature is displayed.
Programming is now complete.

6. After a 2-minute delay, all components will start and run until the set point is
reached.

NOTE: If you miss step 3 in allowed time, the model select sequence will not function and
you will have to reset power to the unit.

All B version replacement boards have a hard-reset option to initiate the programming
sequence.

C

DUAL ZONE ONLY

HARD-RESET PROCEDURE

1. Press and hold the power button until the display reads “OFF”.

2. Press and hold the MODE + UP buttons at the same time until “OFF” disappears. A 3-digit code will be displayed.
Immediately move to step 3.

3. Press and hold the power button for a minimum of 15 seconds until “0” is displayed.

4. Release the power button and use the up arrow to scroll up until you find the code for the model you are working on. See
table below.

5. Wait for the display to time out until the compartment temperature is displayed. Programming is now complete.

MODEL A VERSION MODEL B VERSION CODE

TUR-24-A
TBC-24-A

TUR-24BD-A

TUR-24DD-A

TUR-24D-A TUR-24D-B 102

TWC-24-A TWC-24-B 001

TWC-24DZ-A TWC-24DZ-B 300

TUR-15-A TUR-15-B 105

TWC-15-A TWC-15-B 002

* NOTE: Same codes for A and B versions.

TUR-24-B

TBC-24-B
TUR-24BD-B
TUR-24DD-B

TUF-24-B 200

101

15 & 24 INCH SERVICE MANUAL

33

WIRING DIAGRAM

RESIDENTIAL UNDERCOUNTER 24D

WIRING DIAGRAM

P/N 958860

PART NUMBER 958860

TRUE UNDERCOUNTER DRAWERED UNIT

“A” VERSION

RED

ORANGE

YELLOW

BLACK

GREEN

EVAP FAN MOTOR

POWER CORD

SMOOTH

RIBBED

MODE

LED

LED

SMOOTH

RIBBED

BLUE STRIPE X 1

PROBE EVAP

PROBE CAB

BLUE STRIPE X 2

WHITE

BLACK

GREEN

BLACK

BLACK

BLACK

BLACK

J32

ICE

J1

J29

J33

J30

EXTRENAL DISPLAY

J4

J31

F°

C°

DISPLAY BOARD

LED DRIVER

J2

CONTROL

J3

J16

J7

BOARD

J17

J34

J24

J23

J25

J27

J26

J28

J35

J37

J38

J39

J40

J41

J42

J36

J43

RED

LED

LED

ENERGY

LIGHT

ALARM

SAVER

RED

BLACK

RED

BLACK

BLACK

WHITE

MULLION HEATER

BLUE

BLUE

DRAWER SWITCH 1

TRUE RESIDENTIAL

34

YELLOW

ORANGE

BLACK

PURPLE

SMOOTH

RIBBED

YELLOW

DRAWER SWITCH 2

GREEN

COMPRESSOR

®

INVERTER

COND FAN MOTOR

LOW VOLTAGE

HIGH VOLTAGE

PROBE CAB

PROBE EVAP

BLUE STRIPE X 2

BLUE STRIPE X 1

DRAWER SWITCH 2

YELLOW

YELLOW

LED

BLACK

ORANGE

MODE

BLACK

LED DRIVER

DISPLAY BOARD

ICE

C°

F°

BLACK

RED

LED

ALARM

LIGHT

COLOR

BLACK

GREEN

RIBBED

SMOOTH

EVAP. FAN

BLACK

ORANGE

PURPLE

CONTROL

BOARD

J33

J32

J30

J4

J3

J31

J16

J29

J17

J43

J36

J42

J41

J40

J39

J38

J37

J35

J2

J1

J7

J25

J28

J26

J27

J23

J24

J34

CONTROL

J2

BOARD

J29

J1

J7

J26

J38

J37

J35

J28

J27

J25

J24

J23

J34

RED

YELLOW

RED

BLACK

GREEN

LED

BLACK

LED

BLACK

RED

BLACK

BLACK

LOW VOLTAGE

LOW VOLTAGE

ALARM

COLOR

LIGHT

F°

C°

DISPLAY BOARD

ICE

MODE

BLACK

YELLOW

ORANGE

RED

HIGH VOLTAGE

HIGH VOLTAGE

WIRING DIAGRAM

PART NUMBER 958860

TRUE UNDERCOUNTER DRAWERED UNIT

“A” VERSION

J3

J31

J2

CONTROL

J16

BLACK

RED

LED

BLACK

BLACK

LED

RED

BLACK

BLACK

LED

BLACK

LED

BLACK

RED

LED DRIVER

BLUE STRIPE X 1

BLUE STRIPE X 2

PROBE EVAP

PROBE CAB

DRAWER SWITCH 2

YELLOW

YELLOW

J32

J1

J29

J33

J4

J30

J7

BOARD

J17

J34

J24

J23

J25

J27

J26

J28

J35

J37

J38

J39

J40

J41

J42

J36

J43

BLUE

BLUE

DRAWER SWITCH 1

GREEN

J29

J33

J32

J30

J1

CONTROL

BOARD

J4

J3

J31

J2

J7

J17

J16

J34

J24

J23

J25

J27

J26

J28

J35

J37

J38

J39

J40

J41

J42

J36

J43

BLACK

SMOOTH

ORANGE

PURPLE

GREEN

SMOOTH

BLACK

WHITE

WHITE

GREEN

RIBBED

EVAP. FAN

BLACK

INVERTER

COMPRESSOR

RIBBED

COND. FAN

LED DRIVER

MULLION HEATER

15 & 24 INCH SERVICE MANUAL

35

RED

ORANGE

YELLOW

BLACK

WIRING DIAGRAM

PART NUMBER 957875

TRUE 24” UNDERCOUNTER MODELS

“A” VERSION

F°

LED

MODE

SMOOTH

WHITE

BLACK

ICE

DISPLAY BOARD

BLACK

BLACK

LED DRIVER

C°

RED

LED

COLOR

LIGHT

ALARM

RED

BLACK

GREEN

EVAP FAN MOTOR

POWER CORD

SMOOTH

RIBBED

RIBBED

BLUE STRIPE X 1

PROBE EVAP

PROBE CAB

BLUE STRIPE X 2

GREEN

J2

J7

BOARD

CONTROL

J16

ORANGE

J34
J24
J23
J25
J27
J26
J28
J35
J37
J38
J39
J40
J41
J42

J36

J43

J17

YELLOW

BLACK

PURPLE

SMOOTH

RIBBED

YELLOW

J1

J29

J33

J3

J4

J30

J32

J31

DOOR SWITCH

TRUE RESIDENTIAL

36

GREEN

COMPRESSOR

®

INVERTER

COND FAN MOTOR

LOW VOLTAGE

HIGH VOLTAGE

RED
WHITE
BLACK

GREEN

WIRING DIAGRAM

PART NUMBER 956598

TRUE 15” UNDERCOUNTER MODELS

“A” VERSION

LIGHT

DISPLAY BOARD

WHITE

BLACK

SMOOTH

F°

C°

ICE

LED DRIVER

LED

RED

RED

BLACK

GREEN

EVAP FAN MOTOR

POWER CORD

RIBBED

SMOOTH

RIBBED

BLUE STRIPE X 1

PROBE EVAP

PROBE CAB

BLUE STRIPE X 2

GREEN

J29

J33

J32

J30

J1

J4

J3

J31

BOARD

CONTROL

J16

ORANGE

J17

J24
J23
J25
J27
J26
J28
J35
J37
J38
J39
J40
J41
J42

J36
J43

BLACK

PURPLE

FAN DRIVER

RED

BLUE

YELLOW

WHITE

DOOR SWITCH

J34

J2

J7

COMPRESSOR

INVERTER

GREEN

COND FAN MOTOR

15 & 24 INCH SERVICE MANUAL

37

LOW VOLTAGE

LOW VOLTAGE

WIRING DIAGRAM

PART NUMBER 956598

TRUE 15” UNDERCOUNTER MODELS

“A” VERSION

F°

C°

ICE

LIGHT

GREEN

WHITE

BLACK

RED

HIGH VOLTAGE

HIGH VOLTAGE

RED

DISPLAY BOARD

BLACK

LED

BLACK

RED

LED DRIVER

BLUE STRIPE X 1

PROBE EVAP

PROBE CAB

BLUE STRIPE X 2

DOOR SWITCH

WHITE

YELLOW

J1

J2

J7

BOARD

J29

CONTROL

J33

J4

J32

J30

J3

J17

J16

J31

J34

J24

J23

J25

J27

J26

J28

J35

J37

J38

J39

J40

J41

J42

J36

J43

TRUE RESIDENTIAL

38

GREEN

J32

J1

CONTROL

J29

J33

J4

J30

®

J2

BOARD

J3

J16

J31

J7

J17

J34

J24

J23

J25

J27

J26

J28

J35

J37

J38

J39

J40

J41

J42

J36

J43

BLACK

SMOOTH

ORANGE

PURPLE

GREEN

GREEN

BLACK

INVERTER

COMPRESSOR

COND. FAN
DRIVER

LED DRIVER

WHITE

RIBBED

EVAP. FAN

WIRING DIAGRAM

PART NUMBER 982900

TRUE UNDERCOUNTER DRAWERED UNIT

“B” VERSION

RED

ORANGE

YELLOW

BLACK

GREEN

BLACK

WHITE

WHITE

GREEN

BLACK

WHITE

ICE

BLACK

BLACK

J29

J33

J32

F°

C

°

RED

BLACK

BLUE

RED

GRAY

J2

J1

J4

J3

J30

J31

J34

J7

J24
J23
J25
J27
J26
J28
J35
J37

J38
J39
J40
J41
J42

J36

J43

J16

J17

BLUE

BROWN

RED

BLACK

GREEN

WHITE

PURPLE

SMOOTH

RIBBED

YELLOW

YELLOW/WHITE

YELLOW/WHITE

YELLOW

15 & 24 INCH SERVICE MANUAL

39

WIRING DIAGRAM

PART NUMBER 980395

TRUE 24” UNDERCOUNTER MODELS

“B” VERSION

RED

ORANGE

YELLOW

BLACK

GREEN

BLACK

WHITE

WHITE

GREEN

BLACK

WHITE

ICE

BLACK

BLACK

J29

J33

J32

F°

C

°

RED

BLACK

BLUE

RED

GRAY

J2

J1

J4

J3

J30

J31

J34

J7

J24
J23

J25
J27
J26
J28
J35

J37

J38

J39

J40

J41

J42

J36

J43

J16

J17

BLUE

RED

BROWN

BLACK

TRUE RESIDENTIAL

40

YELLOW/WHITE

WHITE

PURPLE

SMOOTH

RIBBED

YELLOW/WHITE

GREEN

®

WIRING DIAGRAM

PART NUMBER 982979

TRUE 15” UNDERCOUNTER MODELS

“B” VERSION

RED

ORANGE

YELLOW

BLACK

GREEN

BLACK

WHITE

WHITE

GREEN

BLACK

WHITE

F°

C

°

ICE

RED

BLACK

BLUE

RED

GRAY

BLUE

J2

J1

J29

J33

J4

J3

J32

J30

J31

J34

J7

J24
J23
J25
J27
J26
J28
J35
J37
J38
J39
J40
J41
J42

J36

J43

J16

J17

BROWN

ORANGE

WHITE/RED

WHITE/BLUE

WHITE

BROWN

BLUE

RED

ORANGE

BLACK

PURPLE

GREEN

BLACK

YELLOW/WHITE

YELLOW/WHITE

15 & 24 INCH SERVICE MANUAL

41

LOW VOLTAGE

WIRING DIAGRAM

PART NUMBER 952612

TRUE 24” DUAL ZONE WINE CABINET

“A” VERSION

ALARM

LIGHT

F°

C°

F°

C°

MODE

RED

WHITE

GREEN

HIGH VOLTAGE

ICE

ICE

BLACK

J2

J1

BLACK

BLACK

RED

RED

LED

LED

LOWER

DISPLAY BOARD

UPPER

BLACK

BLACK

BLACK

LED

BLACK

LED

BLACK

LED DRIVER

RED

J29

BLACK STRIPE X 2

BLUE STRIPE X 2

BLACK STRIPE X 1

BLUE STRIPE X 1

PROBE EVAP Z2

PROBE EVAP Z1

PROBE COMPT Z2

PROBE COMPT Z1

YELLOW /WHITE

YELLOW /WHITE

DOOR SWITCH

J33

J4

J32

J30

J3

J31

J7

BOARD

CONTROL

J17

J16

J34

J24

J23

J25

J27

J26

J28

J35

J37

J38

J39

J40

J41

J42

J36

J43

TRUE RESIDENTIAL

42

GREEN

J32

®

J1

CONTROL

J29

J33

J4

J30

J2

BOARD

J3

J31

J7

J34

J24

J23

J25

J27

J26

J28

J35

J37

J38

J39

J40

J41

J42

J36

J43

BLACK

WH/BN

BROWN

BLACK

PURPLE

GREEN

ORANGE

REF. VALV E

WHITE

INVERTER

OG/WH

WHITE

GREEN

RIBBED

EVAP.FAN Z1

RIBBED

EVAP.FAN Z2

COMPRESSOR

RIBBED

COND. FAN

J17

J16

BLACK

LED DRIVER

WHITE

WIRING DIAGRAM

PART NUMBER 982539

TRUE 24” DUAL ZONE WINE CABINET

“B” VERSION

RED

BLACK

BROWN

BLUE

F°

C

°

ICE

F°

C

°

ICE

BLUE

BROWN

RED

BLACK

GREEN

WHITE

PURPLE

15 & 24 INCH SERVICE MANUAL

43

WIRING DIAGRAM

PART NUMBER 988399

TRUE 24” FREEZER

“B” VERSION

BLACK

GREEN/YELLOW

WHITE

WHITE

WHITE

WHITE

HEATER

DRAIN

HEATER

3967 - 4849

DRAIN

HEATER

(TUF-24D
ONLY)

MULLION

HEATER

COIL

PAN

TUBE

WHITE

BLACK

WHITE

BLUE

WHITE

BLACK

WHITE

WHITE

WHITE

BLUE

WHITE

WHITE

BLACK
(SMOOTH)

GR AY

(TUF-24D
ONLY)

BLACK

BLUE

C:/Users/josher/Desktop/987697 DECAL.jpg

GR AY

WHITE

WHITE

LN

J1

GR AY

L1

J7

J2

REF

J34

VALVE

J24

J23

J25

J27

J26

J28

J35

J37

DEFROST

LZ1 NC

LZ1 COM

LZ1 NO

LZ2 NC

LZ2 COM

LZ2 NO

CONDENSER

ICE 1

GR AY

GR AY

BLACK

BLACK/WHITE

PINK

BLUE

BLUE
BLUE

ORANGE

BLUE

BLACK

WHITE

BLACK

BLACK

DTS

RED

BLACK
(RIBBED)

BLACK

BLACK/WHITE

RED

RED

BOARD

CONTROL

J39

EVAP1 Z1

BROWN

BROWN

BROWN

BLUE

C:/Users/josher/Desktop/FAN DRIVER.jpg

10K

BLUE

10K

BLACK

(TUF-24D

ONLY)

YELLOW

TRUE RESIDENTIAL

44

EVAP Z2

COMPT Z1 COMPT Z2 EVAP Z1

J32

J33

J30

(N.C)

YELLOW

®

DISPLAY

BOARD

WHITE/YELLOW

WHITE/YELLOW

J41

J36

J43

J3

DOOR Z1 DOOR Z2

(N.C)

EVAP1 Z2

COMPRESSOR

L1

GR AY

PURPLE

GREEN/YELLOW

L

N

WHITE

BLUE

BLACK

RED

RED

COMPRESSOR INFORMATION

ty P e s o f C o m P r e s s o r s a n D s P e C I f I C a t I o n s

45 - 49

v a r I a B l e s P e e D C o m P r e s s o r D I a g n o s t I C s

I n v e r t e r B o a r D D I a g n o s t I C s ta B l e

C o m P r e s s o r C o m P a r t m e n t l a y o u t

15 & 24 INCH SERVICE MANUAL

45

TYPES OF COMRESSORS AND SEPCIFICATIONS

All "A" version units were equipped with a variable speed compressor.

24 inch "B" version units have a single speed compressor.

15 inch "B" version unit have a variable speed compressor.

The compressor compartment can be accessed by removing the rear panel. This will also gain access to the
compressor inverter board and condenser fan motor.

Any time a compressor needs to be changed out, you must go with the OEM compressor that the unit was built
with.

We do not recommend going from a single speed to a variable speed or vice versa.

Call Residential Tech support at 844-746-9423 with questions or concerns.

VARIABLE SPEED

ALL VERSIONS / 15"

INCH B VERSIONS

MODELS/VERSIONS

SINGLE SPEED

REFRIGERATOR / WINE FREEZER

Brand EMBRACO EMBRACO EMBRACO

Model EM20HSC EM 3D5 0HLT VEM Y3H

Nominal Voltage /
Frequency

115-127V / 60HZ 115-127V / 60HZ 1 ~ 230V / 53-150HZ 3 ~

Refrigerant R-134 A R-134 A R-134 A

Start Device TSD - 115V TS D2- 115V INVERTER

Run Capacitor 5µF (175VAC) 15µF (200VAC) N/A

Start Capacitor N/A N/A N/A

Start Winding Resistance 13.18 (Ω at 77°F) +/- 8% 5.92 (Ω at 77°F) +/- 8% 16.07 (Ω at 77°F) +/- 8%

Run Winding Resistance 9.25 (Ω at 77°F) +/- 8% 5.42 (Ω at 77°F) +/- 8% 16.07 (Ω at 77°F) +/- 8%

Locked Rotor Amperage 5.22A 8.0A N/A

Full Load Amperage .86A 1.34A N/A

TRUE RESIDENTIAL

46

®

VARIABLE SPEED COMPRESSOR DIAGNOSIS (SOME MODELS)

16Ω

16Ω

150 VAC.

16Ω

Example A Example B

150 VAC.

150 VAC.

The variable speed compressor is comprised of two components:

1. The inverter board.

2. The compressor.

The compressor speed board is supplied power from the AC line cord. This AC power is converted to DC power
on the board. The DC power is sequentially switched to the three motor windings to drive the compressor. By
adjusting the speed at which these three windings are switched the speed of the compressor can be adjusted.
The switching speed is determined by the amp draw of the compressor. As the load increases the amperage
of the compressor goes up the speed board speed up to compensate. As the amperage goes down the speed
board will slows the compressor down. The resulting speed will adjust between 4500 rpm and 1600 rpm.

PLEASE NOTE: THE VARIABLE SPEED COMPRESSOR IS A 3 PHASE DC COMPRESSOR APPLYING LINE
VOLTAGE TO COMPRESSOR WILL DAMAGE IT.

The VCC looks very similar to a standard single speed compressor. The three terminals on the side of the
compressor look the same also. However when taking resistance measurements around the terminals to the
outside of the case do not let the different motor design cause confusion. The first check is still to verify that
there is NO continuity to the case itself. This is the same as with any standard compressor. When checking
between the three terminals, the resistance measurements should be equal regardless of which two terminals
you are checking. There are three identical windings attached to these terminals so the resistance of the
windings should be equal. It should never read 0 or infinity ohms. With the compressor at 77º the windings will
read about 16 ohms each (see example A).

15 & 24 INCH SERVICE MANUAL

47

Testing the inverter board:

1. Test for line voltage to the inverter. There should be 120V AC between black and orange wires. If no,

check wire harness.

2. Test for signal from temp control board. There should be 120V AC on purple. If no, test the temp

control board.

Because of the frequency of the following voltage tests, not all multimeters may be capable of measuring the
correct voltage. These tests were made using a good quality multimeter, i.e. Fluke, U.E.I., and Amp Probe
brands. The voltage read by your meter will most likely not match the readings made with another meter. The
goal is to verify the presence of the drive signals.

3. Test for output voltage of the inverter board. With the leads still attached to the compressor and
your meter set for 200V AC, test for voltage between all the windings. If your meter reads 150V,
for example, between two windings, it should read 150V between all the rest of the terminals (see
example B). If it does not read same voltage at all three windings, suspect the speed board as being
faulty.

INVERTER BOARD DIAGNOSTICS TABLE

LED STATUS LED STATUS DESCRIPTION

1 FLASH

15 seconds

2 FLASH

5 seconds

3 FLASH

5 seconds

4 FLASH

5 seconds

Control communication problem.

Normal operation

VCC inverter problem.

VCC compressor problem.

• Pull down cycle - if inverter doesn’t sense

the thermostat signal for 10 minutes.

• Normal cycle - if inverter doesn’t receive the

thermostat signal for 4 hours

• Some problem on the inverter hardware

• Is not possible to keep the speed over 1,600

rpm in an overload or overvoltage situation

• Inverter is reaching the max power even at

the minimum speed (1,600 rpm)

• Starting fail

• Rotor position fail

• Over 221ºF internal inverter temperature

1 FLASH

NOTE: PRIOR TO CONDEMING THE INVERTER BOARD. OHM THE COMPRESSOR OUT TO MAKE SURE IT'S
NOT SHORTED TO GROUND NOR HAS AN OPEN WINDING.

TRUE RESIDENTIAL

48

Temperature protection activated.

®

• Over 203ºF internal inverter temperature

• Power limit decreases to protect the inverter

COMPRESSOR COMPARTMENT LAYOUT

“A” V ERSION

A. Inverter Board

B. Condenser Fan Motor

C. Low Side Process Tube

D. High Side Process Tube

E. Cap Tube

A

B

“ B ” V E R S I O N

A

B

15 I N C H V E R S I O N

C

C

D

D

E

A. Condenser Motor

B. Start Components

C. High Side Process Tube

D. Liquid Line Filter Drier

E. Low Side Process Tube

E

A. Inverter Board

B. Condenser Fan Motor

(located behind inverter board)

C. High Side Process Tube

D. Cap Tube

E. Low Side Process Tube

C

A

B

D

E

15 & 24 INCH SERVICE MANUAL

49

SE A L E D S Y S T E M

43 - 48

g o o D r e f r I g e r a t I o n P r a C t I C e s

s y s t e m P r e s s u r e s

tr o u B l e s h o o t I n g , r e P a I r s & r e P l a C e m e n t

TRUE RESIDENTIAL

50

®

GOOD REFRIGERATION PRACTICES

GOOD REFRIGERATION PRACTICES WILL ALWAYS START WITH GOOD DETECTIVE WORK TO FIND OUT
WHAT CAUSED THE FAILURE SO WE CAN ELIMINATE THE POSSIBILITY OF A REPEAT FAILURE. BELOW
IS A STEP BY STEP SET OF PROCEDURES WE WOULD RECOMMEND IS FOLLOWED WHEN REPAIRING A
REFRIGERATION SYSTEM.

• Before opening the refrigeration system remember

that POE oil is very hydroscopic and absorbs
moisture very quickly. You should not leave the
system open to the atmosphere for more than 15
minutes. Any vacuum that exists before any repair
should be broken with nitrogen to avoid moisture
being pulled into the system.

• For your manifold gauges, use as short of

refrigeration hoses as possible. We recommend
maximum of 12” (304.8 mm) hoses.

• Always replace the drier with the exact OEM size

when opening the refrigeration system.

• Recover the refrigerant from the system.

• The introduction to the refrigeration system of

anything other than a flushing agent, nitrogen,
refrigerant, or oil is prohibited.

• Remove the faulty refrigeration component and

filter drier by cutting them out with a tubing cutter.

• If you are changing a component keep the system

closed up with plugs or caps to reduce moisture
contamination.

• Take a look at the filter drier and the components

that have been removed for signs of oil breakdown,
foreign objects like desiccant from drier, metal
pieces from valves, etc.

• When replacing a compressor make sure to also

remove all old oil from the system.

• While purging nitrogen through the system drill

(approximately 1/8”) (3.18 mm) hole in the
bottom of the accumulator (IF EQUIPPED) so we
do not leave contaminated oil in the system. After
blowing this out with nitrogen, be sure to braze
the hole closed.

• Be sure and test the oil from the refrigeration

system for contamination using the proper test kit
for the type of oil.

• If the oil shows signs of contamination or there was

a restriction in the system, all of the oil must be
removed and replaced. This can be accomplished
by removing the compressor and flushing the
entire system with nitrogen. Remove all the oil in
the compressor, and in the accumulator. Measure
all the old oil in a measuring cup and replace
the exact amount you removed with the new oil.
If necessary, a flushing agent can be used for
cleanup.

• Place a nitrogen charge in the system to check

for any leaks. Use maximum 200 PSI (13.8 Bar).

• Release the nitrogen charge down to about

• 2 pounds of positive pressure (.1379 bar).

• Start pulling a vacuum as soon as possible to help

remove any moisture from the system. Remember
that any moisture that is absorbed by the POE oil
cannot be removed and we must start the process
ov er.

• Change vacuum pump oil regularly to ensure the

deepest vacuum your pump is capable of.

• Using a micron gauge, pull the system down to

hold a minimum of 500 microns (0.5 Torr).

• See if the system will hold this micron with the

gauges closed and the pump switched off to test
for leaks or moisture.

• Once the system is evacuated, weigh in the listed

refrigerant charge located on the serial tag inside
the cabinet. Refrigerant 134a/404A charge as
a liquid only. Refrigerant should be charged
through the high side.

• Test run the unit and check for proper operation.

AFTER REPAIR IS COMPLETE ALL ACCESS FITTINGS MUST BE REMOVED.

PLEASE CALL TRUE TECHNICAL SERVICE WITH ANY QUESTIONS REGARDING THE ABOVE PRACTICES.

SYSTEM PRESSURES

• Ambient Temperature + 15˚ = Saturation pressure

for that temperature. This High Side Pressure will
be +/- 5 psig.

NOTE: FOR MOST ACCURATE RESULTS, TAKE READING WHEN CABINET IS RUNNING AND NEAR CUT OUT
TEMPERATURES.

• Cabinet / zone Temperature -20 degrees =

Saturation pressure for that temperature. This
Low Side Pressure will be +/-3 psig.

15 & 24 INCH SERVICE MANUAL

51

TROUBLESHOOTING THE REFRIGERATION SYSTEM

DO NOT CUT OFF PROCESS TUBE ENDS - Using piercing type service valves, attach one of these to each of the

suction and liquid line process tubes (as close to the end of the tube as possible).

MAKE SURE THE GAUGES YOU ARE USING ARE CALIBRATED AND CORRECTLY INSTALLED.

After connecting your gauges - make sure you confirm the compressor is running when doing the next diagnostic
checks.

BAD COMPRESSOR VALVES

If your system has a high suction pressure and low discharge pressure and the compressor is drawing low amps
its very likely you have a compressor with bad valves. If this is the case, replace the compressor.

DETERMINE LEAK OR RESTRICTION

If your system has a low suction pressure and low discharge pressure, first look to see if there are no visible kinks
in the system tubing, then recover the refrigerant and weigh in the correct charge.

If your evaporator coil temperature drops and the system starts to operate correctly this is a sign that your

A.

system has a refrigerant leak. This means that the refrigerant leak must be located and repaired. A technician
can raise system pressure up 200 psi with nitrogen to aid in the leak search.

If the head pressure rises but falls right back down after you stop adding gas and the suction pressure stays

B.

low there may be a restriction in the system. Recover the charge and cut out the drier. Also cut about 2” off of
the capillary tube. Circulate nitrogen through the system to clear any restrictions in the evaporator. Evacuate
the system and recharge. If the problem still exists, capillary tube may need to be replaced.

*EACH TIME A SYSTEM IS TAPPED INTO, IT IS VERY IMPORTANT THAT THE DRIER IS REPLACED AND
A MINIMUM 500 MICRON VACUUM IS PULLED THROUGH BOTH HIGH AND LOW SIDE ACCESS FITTINGS.
AFTER THE SYSTEM IS RECHARGED BOTH ACCESS FITTINGS MUST BE REMOVED.

TRUE RESIDENTIAL

52

®

REPLACING THE COMPRESSOR

Tape front door closed. Lean front of cabinet

1.
against wall or something as stable. Cover
front of cabinet to keep from damaging
wall or cabinet. Remove rear cover. Rest
unit against the wall and remove the back
and bottom of the unit.

FIGURE 1

Reclaim per EPA standards. Cut suction

2.
line just above joint (figure 2). Rotate
suction line attached to compressor out of
the way. Disconnect liquid line.

FIGURE 2

FIGURE 3

Remove (4) 3/8” bolts from both left

3.
and right of the bottom panel (figure

3). Insert a 2x2 to hold bottom down
(figure 4). Remove the pull pins located
on each bolt of the compressor legs. Pull
compressor up to clear bolts and pull out.
With compressor removed change drier.
Reinstall compressor in reverse order.

FIGURE 4

*A 500 MICRON VACUUM MUST BE PULLED AND CHARGE WEIGHT BACK IN.

15 & 24 INCH SERVICE MANUAL

53

REPLACING THE CONDENSER COIL

Repeat steps 1 & 2 of Replacing the Compressor.

Remove the four 3/8” bolts on the left and right side of the cabinet base securing the bottom plate of unit. Pull
compressor and condenser coil out as a unit. Replace coil and drier. Reinstall bottom plate in reverse order.

(figure 3)

*A 500 MICRON VACUUM MUST BE PULLED AND CHARGE WEIGHT BACK IN.

FIGURE 3

REPLACING THE CAP TUBE

Remove evaporator cover un-braze cap tube from evaporator coil. Remove compressor as earlier indicated. Cut
connection at liquid line and drier. Pull cap tube down and through hole of cabinet floor. Install new drier and
cap tube at drier end. Reroute cap tube into cabinet and braze into evaporator coil. Reinstall compressor.

* A 500 MICRON VACUUM MUST BE PULLED AND CHARGE WEIGHT BACK IN.

REPLACING THE EVAPORATOR COIL

Remove evaporator cover (see probe replacement). Un-braze suction and cap joints at evaporator. Remove
evaporator coil. Remove compressor (see compressor replacement). Replace drier filter. Install evaporator coil.
Re-braze fittings.

* A 500 MICRON VACUUM MUST BE PULLED AND CHARGE WEIGHT BACK IN.

LEAK CHECK GUIDELINES

True Manufacturing recommends to leak check a unit by using a trace amount of refrigerant and charging
the system with nitrogen to 200 psi (not to exceed 220). If leak is not located by this method, then True
Manufacturing recommends that the low side be separated by the high side. Charge both sections with nitrogen
at 200 psi and see which side does not hold.

SYSTEM EVACUATION

Any time a system is open, True Manufacturing expects the drier to be changed, the system vacuumed down to
500 microns or lower and the refrigerant charged weight in.

TRUE RESIDENTIAL

54

®

MAINTENANCE

s t a I n l e s s s t e e l C a r e a n D C l e a n I n g

g a s k e t C l e a n I n g

55 - 58

g e n e r a l m a I n t e n a n C e ,

w a r r a n t y

15 & 24 INCH SERVICE MANUAL

55

STAINLESS STEEL EQUIPMENT CARE AND CLEANING

CAUTION: DO NOT USE ANY STEEL WOOL,
ABRASIVE OR CHLORINE BASED PRODUCTS TO

CLEAN STAINLESS STEEL SURFACES.

STAINLESS STEEL OPPONENTS

There are three basic things which can break down
your stainless steel’s passivity layer and allow

corrosion to rear its ugly head.

1. Scratches from wire brushes, scrapers, and steel
pads are just a few examples of items that can be

abrasive to stainless steel’s surface.

2. Deposits left on your stainless steel can leave
spots. You may have hard or soft water depending
on what part of the country you live in. Hard water
can leave spots. Hard water that is heated can
leave deposits if left to sit too long. These deposits
can cause the passive layer to break down and
rust your stainless steel.
All deposits left from food prep or service should
be removed as soon as possible.

3. Chlorides are present in table salt, food, and
water. Household and industrial cleaners are the
worst type of chlorides
to use.

RECOMMENDED CLEANERS FOR CERTAIN SITUATIONS /

ENVIRONMENTS OF STAINLESS STEEL

A. Soap, ammonia and detergent medallion applied

with a cloth or sponge can be used for routine
cleaning.

NOTE: THE USE OF STAINLESS STEEL
CLEANERS OR OTHER SUCH SOLVENTS IS NOT
RECOMMENDED ON PLASTIC PARTS. WARM
SOAP AND WATER WILL SUFFICE.

8 STEPS THAT CAN HELP PREVENT RUST ON STAINLESS STEEL:

1. USING THE CORRECT CLEANING TOOLS

Use non-abrasive tools when cleaning your stainless steel

products. The stainless steel’s passive layer will not be
harmed by soft cloths and plastic scouring pads. Step 2
tells you how to find the polishing marks.

2. CLEANING ALONG THE POLISH LINES

Polishing lines or “grain” are visible on some stainless

steels. Always scrub parallel to visible lines on some
stainless steels. Use a plastic scouring pad or soft cloth
when you cannot see the grain.

3. USE ALK ALINE, ALKALINE CHLORINATED OR NON-
CHLORIDE CONTAINING CLEANERS

While many traditional cleaners are loaded with chlorides,

the industry is providing an ever increasing choice of non­chloride cleaners. If you are not sure of your cleaner’s
chloride content contact your cleaner supplier. If they
tell you that your present cleaner contains chlorides,
ask if they have an alternative. Avoid cleaners containing
quaternary salts as they can attack stainless steel, causing
pitting and rusting.

4. WATER TREATMENT

To reduce deposits, soften the hard water when possible.

Installation of certain filters can remove corrosive and
distasteful elements. Salts in a properly maintained water
softener can be to your advantage. Contact a treatment
specialist if you are not sure of the proper water
treatment.

B. Arcal 20, Lac-O-Nu Ecoshine applied provides

barrier film for fingerprints and smears.

C. Cameo, Talc, Zud First Impression is applied by

rubbing in the direction of the polished lines for
stubborn stains and discoloring.

D. Easy-off and De-Grease It oven aid are excellent

for removals on all finishes for grease-fatty acids,
blood and burnt-on foods.

E. Any good commercial detergent can be applied

with a sponge or cloth to remove grease and oil.

F. Benefit, Super Sheen, Sheila Shine are good for

restoration / passivation.

TRUE RESIDENTIAL

56

®

5. MAINTAINING THE CLEANLINESS OF YOUR FOOD
EQUIPMENT

Use cleaners at the recommended strength (alkaline

chlorinated or non-chloride). Avoid build-up of hard
stains by cleaning frequently. When boiling water with
your stainless steel equipment, the single most likely cause
of damage is chlorides in the water. Heating any cleaners
containing chlorides will have the same damaging effects.

6. RINSE

When using chlorinated cleaners you must rinse and wipe

dry immediately. It is better to wipe standing cleaning
agents and water as soon as possible. Allow the stainless
steel equipment to air dry. Oxygen helps maintain the
passivity film on stainless steel.

7. HYDROCHLORIC ACID (MURIATIC ACID) SHOULD NEVER
BE USED ON STAINLESS STEEL

8. REGULARLY RESTORE /PASSIVATE STAINLESS STEEL

GASKET CLEANING

CLEAN THE DOOR GASKET BY FOLLOWING THESE STEPS:

1. Turn the unit off.

2. Use a mild detergent and water with a soft cloth. Water and baking soda paste may be used to remove
tough stains.

3. Use a 1:10 part ratio of bleach to water and a soft cloth to wipe down the interior and affected areas if mold
or mildew are present.

4. Rinse and dry thoroughly.

GENERAL MAINTENANCE

Keeping the condenser coil clean will minimize required service and lower electrical cost. The condenser coil is
accessible from the front.

The condenser coil should be cleaned by removing dust and other build-up from the tube assembly with
vacuum or a cleaning rag.

When properly cleaned you should be able to see through the tube assembly.

Warranty does not cover cleaning the condenser coil.

15 & 24 INCH SERVICE MANUAL

57

TRUE RESIDENTIAL® SERIES

LIMITED WARRANTY STATEMENT

LIMITED 30 DAY COSMETIC WARRANTY

Stainless steel doors, handles, and shelves are warranted to be free from defective materials or workmanship for a period of thirty (30)
days from the date of original retail purchase. Any defects must be reported to the selling dealer within thirty (30) days from the date of
original retail purchase. This limited warranty excludes any type of freight / concealed damage.

THREE-YEAR PARTS & LABOR WARRANTY *For units purchased after Feb 1, 2013.
TRUE warrants to the original purchaser of every new TRUE refrigerated unit, the cabinet and all parts thereof, to be free from defects in
material or workmanship under normal and proper use and maintenance as specified by TRUE and upon proper installation and start-up
in accordance with the instruction packet supplied with each TRUE unit. TRUE’s obligation under this warranty is limited to a period of
three (3) years from the date of original installation or thirty nine (39) months after shipment date from TRUE, whichever occurs first.

SIX-YEAR SEALED SYSTEM WARRANTY - PARTS & LABOR *For units purchased after Feb 1, 2013.
TRUE warrants its hermetically sealed system: compressor, evaporator coil, condenser coil, drier, metering device and connecting tubing
to be free from defects in both material and workmanship under normal and proper use and maintenance service for a period of six (6)
years from the date of original installation but not to exceed six (6) years and three (3) months after shipment from the manufacturer,
whichever occurs first.

SEVEN THROUGH TWELVE-YEAR SEALED SYSTEM WARRANTY - PARTS ONLY *For units shipped from True after Feb 1, 2017
and REGISTERED via True’s Product Registration Page – TRUE warrants its hermetically sealed system: compressor, evaporator coil,
condenser coil, drier, metering device and connecting tubing to be free from defects in both material and workmanship under normal
and proper use and maintenance service period of Twelve (12) years from the date of original installation but not to exceed twelve (12)
years and three (3) months after shipment from the manufacturer, whichever occurs first. Product must be registered with True to qualify
for this warranty. Factory seconds and clear Ice machines are excluded from this warranty.

TERMS APPLICABLE TO EACH WARRANTY

Any part covered under the above warranties that is determined by TRUE to have been defective within the time frame is limited to the
repair or replacement, including labor charges, of defective parts or assemblies. The labor warranty shall include standard straight time
labor charges only and reasonable travel time, as determined by TRUE.

WARRANTY CLAIMS

All claims for labor or parts must be made directly through TRUE. All claims should include: model number and serial number of
cabinet, proof of purchase, and date of installation. In case of warranted compressor, the compressor model tag must be returned to
TRUE along with the above listed information.

WHAT IS NOT COVERED BY THIS WARRANTY

TRUE’s sole obligation under this warranty is limited to either repair or replacement of parts, subject to the additional limitations below.
This warranty neither assumes nor authorizes any person to assume obligations other than those expressly covered by this warranty.

NO CONSEQUENTIAL DAMAGES. TRUE is not responsible for economic loss, profit loss; or special, indirect or consequential
damages, including without limitation, losses or damages arising from food or product spoilage claims whether or not on account or
refrigeration failure.

WARRANTY IS NOT TRANSFERABLE. This warranty is not assignable and applies only in favor of the original purchaser/user to whom
delivered. Any such assignment or transfer shall void the warranties herein made and shall void all warranties, express or implied,
including any warranty or merchantability or fitness for a particular purpose.

IMPROPER USAGE. TRUE assumes no liability for parts or labor coverage for component failure or other damages resulting from
improper usage or installation or failure to clean and/or maintain product as set forth in the warranty packet provided with the unit.

ALTERATION OR NEGLECT. TRUE is not responsible for the repair or replacement of any parts that TRUE determines have been
subjected after the date of manufacture to alteration, neglect, abuse, misuse, accident, damage during transit or installation, fire, flood,
or act of God.

IMPROPER ELECTRICAL CONNECTIONS. TRUE is not responsible for the repair or replacement of failed or damaged components
resulting from electrical power failure, high or low voltage, use of extension cords, or improper grounding of the unit.

YOUR RIGHTS UNDER STATE LAW.

This warranty gives you specific legal rights and you may have other rights that vary from state to state. Some states do not allow
the exclusion or limitation of consequential damages or a limitation on how long an implied warranty lasts, so the above exclusion or
limitation may not apply to you.

OUTSIDE U.S./CANADA. This warranty does not apply to, and TRUE is not responsible for, any warranty claims made on products sold
or used outside the United States or Canada.

SUBMIT WARRANTY CLAIMS TO: True Residential
2001 East Terra Lane
O’Fallon MO 63366
[e-mail]

TRUE RESIDENTIAL

58

®

CONTACT US

www.true-residential.com

[phone] • toll free [phone]

SD • 12-18 • MISC_2175