Hoshizaki RTW Series User manual

1
COMMERCIAL UNDERCOUNTER
REFRIGERATOR/FREEZER
RTW & FTW
Date
22-08-2016
Rev No
0
DOC NO
VDP/SM/22-01-
2016

2
Table of Contents:
SNO
CONTENT
PAGE NO
1
Safety Instructions
3
2
Product Indent Use
5
3
Dimension Layout
6
4
Exploded View of all parts
8
5
Technical Specification
11
6
Procedure to open the CANOPY
14
7
Procedure to replace the Evaporator fan motor
15
8
Procedure to replace the Dew Collector
16
9
Procedure to replace the Defrost Heater
17
10
Procedure to replace the Defrost Sensor
18
11
Procedure to replace the Appliance Sensor
19
12
Procedure to replace the Condenser Fan Motor
20
13
Procedure to replace the Carel Controller
21
14
Carel Controller Connections
21
15
Procedure to Replace the Door Switch
22
16
Procedure to replace the Door Gasket
23
17
Procedure to replace the Door Assembly
24
18
Carel Controller Programming
25
19
Carel Controller Alarms
27
20
Wiring drawings
28
21
Trouble Shooting
30

3
Safety instructions:
The following instructions contain important safety precautions an should be
strictly observed
WARNING: There is a possibility of death or serious injury to the service person
and a third party or the user due to improper service operations or defects in
serviced products.
CAUTION: there is a possibility of injury to the service person and a third party or
the user or damage their property due to improper service operations or defects
in serviced products.
WARNING:
Always ask the user to keep children away from the work area. They may
be injured by tools or disassembled products.
when there is no need to energize the unit during disassembly or cleaning
be sure to unplug the unit or disconnect the main power supply before
servicing the unit to prevent electric shocks
If the unit must be energized for inspection of the electric circuit, use
rubber gloves to avoid contact with any live parts resulting in electric
shocks.
Keep the following in mind when servicing the refrigeration circuit.
1) Be sure to recover the refrigerant, Do not discharge it into the atmosphere. It
will affect the environment.
2) Check for any flames in the vicinity, and ensure good ventilation.
3) If the refrigerant should leak in servicing, immediately put out any fire used in
the vicinity.

4
4) When unbrazing the refrigeration circuit connections, check that the circuit is
completely evacuated. The refrigerant may produce a poisonous gas when
coming in contact with an open flame.
5) Do not braze in an enclosed room to prevent carbon monoxide poisoning .
6) In case of a refrigerant leak, locate and repair the leaking part completely
before recharging the refrigerant and checking for further leaks. If the leaking part
cannot be located, be sure to check again for further leaks after recharging the
refrigerant. Leaked refrigerant may produce a poisonous gas when coming in
contact with an open flame of a gas cooking stove or a fan heater.
7) Before servicing, check the surface temperature of the refrigeration circuit to
prevent a burn.
Keep the following in mind when making electrical connections.
1) Check for proper earth connections, and repair if necessary to prevent electric
shocks.
2) Always use service parts intended for the applicable models for replacement of
defective parts. Use proper tools to secure the wiring. Otherwise abnormal
operation or trouble may occur and cause electric shocks.
3) Check for proper part installations, wiring condition and soldered or soloderless
terminal connections to avoid fire, heat or electric shocks.
4) Be sure to replace damaged or deteriorated power cords and lead wires to
prevent fire, heat or electric shocks.
5) Cut-off lead wires must be bound using closed end connectors or the like, with
their closed ends up to avoid entrance of moisture that could lead to electric leaks
or fire.
6) After servicing, always use a megohmmeter(500V DC)to check for insulation
resistance of at least 1 megohm between the live part and dead metal part.
7) Do not service the electrical parts with wet hands to prevent electric shocks.
8) The capacitors used for the compressor and the other components may be
under high voltage and should be discharged properly before servicing.

5
CAUTION
After servicing, follow the instructions below:
1) Always check the unit for proper operation before finishing services.
2) Be sure to reassemble the parts completely. Loose assembly of such parts as
control box cover may cause entrance of vermin's resulting in a short circuit
between terminals and possible ignition.
Product Intended Use:
RTW Series
These products are solid door commercial refrigerator used to store/preserve
Refrigerated food products. This is mainly used in commercial establishment.
It operates at 230V/50Hz power input.
RTW-120 and RTW- 150 are two door models and RTW-180 is four door model.
Both uses electronic temperature controller, R134a as refrigerant, CFC free
insulation and are classified climatic class T (5) i.e. Ambient 40°C and 40% RH
Nomenclature
R – Refrigerator
T – Undercounter
W– Made by Western Refrigeration
FTW-120 and FTW- 150 are two door models and FTW-180 is four door model.
Both uses electronic temperature controller, R404A as refrigerant, CFC free
insulation and are classified climatic class T (5) i.e. Ambient 40°C and 40% RH
Nomenclature
F-Freezer

6
T – Undercounter
W– Made by Western Refrigeration
DIMENSIONAL LAYOUT:
PRODUCT OUTSIDE DIMENSIONS IN MM (WITH LEGS):
RTW-120/ FTW-120
1200 (W) x 750 (D) x 850 (H)
RTW-150/ FTW-150
1500 (W) x 750 (D) x 850 (H)
RTW-180/ FTW-180
1800 (W) x 750 (D) x 850 (H)
RTW-126/ FTW-126
1200 (W) x 600 (D) x 850 (H)
RTW-156/ FTW-156
1500 (W) x 600 (D) x 850 (H)
RTW-127/ FTW-127
1200 (W) x 700 (D) x 850 (H)
RTW-177/ FTW-177
1660 (W) x 700 (D) x 850 (H)

7
INSTALLATION REQUIREMENTS:
LOCATION:
For best operating results,
1) The under counter should not be located next to ovens, grills and other
high heat producing equipment’s.
2) The location should provide a firm foundation for the equipment’s.
3) Do not expose the unit to direct sun light or higher temperatures.
4) Allow 50 mm clearance at front and back of the unit for smooth operation.
Also allow 100 mm clearance from the left side of the unit.
SET UP:
1) Cut the vinyl shipping tape and remove the carton
2) Take out the accessory shelves, shelf clips and legs. Attach the shelf clips
horizontally to the shelf posts. Place the shelf’s on the shelf clips.

8
3) Turn the unit 90 degrees on the pallet, tilt the unit sideways, and screw in
the two adjustable legs.
4) Tilt the unit in opposite direction and screw the other two legs.
5) Slide out the pallet form the unit.
6) Level the freezer in both left and right, front and rear sides.

9
TECHNICAL SPECIFICATIONS
Model
RTW-120
RTW-126
Power supply
Single phase, 230V AC, 50Hz
Single phase, 230V AC, 50Hz
Amperage
1.5 Amp
1.5 Amp
Electrical consumption
290 Watt
290 Watt
Heat rejection
0.56 kW
0.56 kW
Power cord
10 Amps / 3 meter
10 Amps / 3 meter
Effective capacity
295 Liters
222 litres
Outside dimension
1200 (W) x 750 (D) x 850 (H - with
150mm leg)
1200 (W) x 600 (D) x 850 (H - with
150mm leg)
Inside dimension
833 (W) x 623 (D) x 588 (H)
833 (W) x 473 (D) x 588 (H)
Exterior
SS 430 hair line No. 4 finished
SS 430 hair line No. 4 finished
Interior
SS 430 2B mirror finished
SS 430 2B mirror finished
Insulation
PUF (CFC free) / RT & Bottom:
50mm, LT, Back, Top & Door:
60mm
PUF (CFC free) / RT & Bottom:
50mm, LT, Back, Top & Door:
60mm
Insulation foam blowing
agent
Cyclopentane
Cyclopentane
Refrigeration system
Forced Air circulation
Forced Air circulation
Defrost system
In compressor off cycle
In compressor off cycle
Compressor
Tecumseh / THK9414YJE / 366 W
Tecumseh / THK9414YJE / 366 W
Condenser
Forced (Fin & Tube)
Forced (Fin & Tube)
Evaporator
Forced (Fin & Tube)
Forced (Fin & Tube)
Refrigerant
R134a / 260 gram
R134a / 260 gram
Temperature control
Electronic digital temperature
indication adjust from -2.0°C to
12°C
Electronic digital temperature
indication adjust from -2.0°C to
12°C
Defrost control
By temperature controller
By temperature controller
Electric circuit protection
Non resettable fuse (Glass fuse)
Non resettable fuse (Glass fuse)
Leg
4 nos of plastic adjustable legs
(150mm to 180mm)
4 nos of plastic adjustable legs
(150mm to 180mm)
Shelf
4 nos of shelves (including bottom
shelf)
4 nos of shelves (including
bottom shelf)
Package
Carton (Pallet) 1270mm (W) X
820mm (D) X 875mm(H)
Carton (Pallet) 1270mm (W) X
670mm (D) X 875mm(H)
Accessories
Shelf clips
Shelf clips
Operating condition
Ambient temperature : 5 - 43°C
Voltage range rated voltage ±10%
Ambient temperature : 5 - 43°C
Voltage range rated voltage ±10%

10
TECHNICAL SPECIFICATIONS
Model
RTW-156MS4
RTW-150MS4
Power supply
Single phase, 230V AC, 50Hz
Single phase, 230V AC, 50Hz
Amperage
1.5 Amp
1.5 Amp
Electrical consumption
290 Watt
290 Watt
Heat rejection
0.56 kW
0.56 kW
Power cord
10 Amps / 3 meter
10 Amps / 3 meter
Effective capacity
305 Liters
404 Litres
Outside dimension
1500 (W) x 600 (D) x 850 (H - with
150mm leg)
1500 (W) x 750 (D) x 850 (H - with
150mm leg)
Inside dimension
1133 (W) x 473 (D) x 588 (H)
1133 (W) x 623 (D) x 588 (H)
Exterior
SS 430 hair line No. 4 finished
SS 430 hair line No. 4 finished
Interior
SS 430 2B mirror finished
SS 430 2B mirror finished
Insulation
PUF (CFC free) / RT & Bottom:
50mm, LT, Back, Top & Door:
60mm
PUF (CFC free) / RT & Bottom:
50mm, LT, Back, Top & Door:
60mm
Insulation foam blowing
agent
Cyclopentane
Cyclopentane
Refrigeration system
Forced Air circulation
Forced Air circulation
Defrost system
In compressor off cycle
In compressor off cycle
Compressor
Tecumseh / THK9414YJE / 366 W
Tecumseh / THK9414YJE / 366 W
Condenser
Forced (Fin & Tube)
Forced (Fin & Tube)
Evaporator
Forced (Fin & Tube)
Forced (Fin & Tube)
Refrigerant
R134a / 260 gram
R134a / 260 gram
Temperature control
Electronic digital temperature
indication adjust from -2.0°C to
12°C
Electronic digital temperature
indication adjust from -2.0°C to
12°C
Defrost control
By temperature controller
By temperature controller
Electric circuit protection
Non resettable fuse (Glass fuse)
Non resettable fuse (Glass fuse)
Leg
4 nos of plastic adjustable legs
(150mm to 180mm)
4 nos of plastic adjustable legs
(150mm to 180mm)
Shelf
4 nos of shelves (including bottom
shelf)
4 nos of shelves (including
bottom shelf)
Package
Carton (Pallet) 1570mm (W) X
670mm (D) X 875mm(H)
Carton (Pallet) 1570mm (W) X
820mm (D) X 875mm(H)
Accessories
Shelf clips
Shelf clips
Operating condition
Ambient temperature : 5 - 43°C
Voltage range rated voltage ±10%
Ambient temperature : 5 - 43°C
Voltage range rated voltage ±10%

11
TECHNICAL SPECIFICATIONS
Model
RTW-180MS4
RTW-186MS4
Power supply
Single phase, 230V AC, 50Hz
Single phase, 230V AC, 50Hz
Amperage
1.7 Amp
1.7 Amp
Electrical consumption
370 Watt
370 Watt
Heat rejection
0.73 kW
0.73 kW
Power cord
10 Amps / 3 meter
10 Amps / 3 meter
Effective capacity
511 Liters
385 Liters
Outside dimension
1800 (W) x 750 (D) x 850 (H - with
150mm leg)
1800 (W) x 600 (D) x 850 (H - with
150mm leg)
Inside dimension
1433 (W) x 623 (D) x 588 (H)
1433 (W) x 473 (D) x 588 (H)
Exterior
SS 430 hair line No. 4 finished
SS 430 hair line No. 4 finished
Interior
SS 430 2B mirror finished
SS 430 2B mirror finished
Insulation
PUF (CFC free) / RT & Bottom:
50mm, LT, Back, Top & Door:
60mm
PUF (CFC free) / RT & Bottom:
50mm, LT, Back, Top & Door:
60mm
Insulation foam blowing
agent
Cyclopentane
Cyclopentane
Refrigeration system
Forced Air circulation
Forced Air circulation
Defrost system
In compressor off cycle
In compressor off cycle
Compressor
Tecumseh / THK9417YJE / 468 W
Tecumseh / THK9417YJE / 468 W
Condenser
Forced (Fin & Tube)
Forced (Fin & Tube)
Evaporator
Forced (Fin & Tube)
Forced (Fin & Tube)
Refrigerant
R134a / 300 gram
R134a / 300 gram
Temperature control
Electronic digital temperature
indication adjust from -2.0°C to
12°C
Electronic digital temperature
indication adjust from -2.0°C to
12°C
Defrost control
By temperature controller
By temperature controller
Electric circuit protection
Non resettable fuse (Glass fuse)
Non resettable fuse (Glass fuse)
Leg
4 nos of plastic adjustable legs
(150mm to 180mm)
4 nos of plastic adjustable legs
(150mm to 180mm)
Shelf
6 nos of shelves (including bottom
shelf)
6 nos of shelves (including
bottom shelf)
Package
Carton (Pallet) 1870mm (W) X
820mm (D) X 875mm(H)
Carton (Pallet) 1870mm (W) X
670mm (D) X 875mm(H)
Accessories
Shelf clips
Shelf clips
Operating condition
Ambient temperature : 5 - 43°C
Voltage range rated voltage ±10%
Ambient temperature : 5 - 43°C
Voltage range rated voltage ±10%

12
TECHNICAL SPECIFICATIONS
Model
FTW-127MS4-GN
FTW-177MS4-GN
Power supply
Single phase, 230V AC, 50Hz
Single phase, 230V AC, 50Hz
Amperage
3.9 Amp
3.7 Amp
Electrical consumption
600 Watt
Defrost Heater: 165W x 2 nos.
600 Watt
Defrost Heater: 165W x 2 nos.
Heat rejection
1.113 kW
1.32 kW
Power cord
10 Amps / 3 meter
10 Amps / 3 meter
Effective capacity
281 Liters
436 Litres
Outside dimension
1200 (W) x 700 (D) x 850 (H -
with 150mm leg)
1660 (W) x 700 (D) x 850 (H -
with 150mm leg)
Inside dimension
833 (W) x 573 (D) x 588 (H)
1293 (W) x 573 (D) x 588 (H)
Exterior
SS 430 hair line No. 4 finished
SS 430 hair line No. 4 finished
Interior
SS 430 2B mirror finished
SS 430 2B mirror finished
Insulation
PUF (CFC free) / RT & Bottom:
50mm, LT, Back, Top & Door:
60mm
PUF (CFC free) / RT & Bottom:
50mm, LT, Back, Top & Door:
60mm
Insulation foam blowing
agent
Cyclopentane
Cyclopentane
Refrigeration system
Forced Air circulation
Forced Air circulation
Defrost system
Heater defrost
Heater defrost
Compressor
Embraco / NEK2150GK / 616
W
Embraco / NEU2168GK / 744
W
Condenser
Forced (Fin & Tube)
Forced (Fin & Tube)
Evaporator
Forced (Fin & Tube)
Forced (Fin & Tube)
Refrigerant
R404A / 315 gram
R404A / 300 gram
Temperature control
Electronic digital temperature
indication adjust from -7°C to -
23°C
Electronic digital temperature
indication adjust from -7°C to -
23°C
Defrost control
By temperature controller
By temperature controller
Electric circuit protection
Non resettable fuse (Glass
fuse)
Non resettable fuse (Glass
fuse)
Leg
4 nos of plastic adjustable legs
(150mm to 180mm)
4 nos of plastic adjustable legs
(150mm to 180mm)
Shelf
4 nos of shelves (including
bottom shelf)
6 nos of shelves (including
bottom shelf)
Package
Carton (Pallet) 1270mm (W) X
770mm (D) X 875mm(H)
Carton (Pallet) 1730mm (W) X
770mm (D) X 875mm(H)
Accessories
GN rail set
GN rail set
Operating condition
Ambient temperature : 5 -
43°C
Voltage range rated voltage
±10%
Ambient temperature : 5 -
43°C
Voltage range rated voltage
±10%

13
ROCEDURE TO REPLACE APPLICATION SENSOR
STEP 1
STEP 2
After unscrewing the
six screws open the
Panel & unscrew the
Sensor screw as shown
in figure
Unscrew the six screws
M5 TAPTITE fitted to
the panel & remove
Fan socket as shown in
figure
STEP 3
Remove side panel &
Pull the Sensor from
Evaporator .pipe as
shown in figure

14
PROCEDURE REPLACE DEFROST SENSOR
STEP 4
Remove Application
Sensor socket (white
colour) from Control
panel
For fix the Application sensor make reverse steps as
shown in figure.
STEP 1
Unscrew the six screws
M5 TAPTITE fitted to
the panel & remove
Fan socket as shown in
figure

15
STEP 2
Remove the Defrost
sensor as shown in
figure
STEP 3
Remove side panel &
Pull the Sensor from
Evaporator .pipe as
shown in figure
STEP 4
Remove Defrost
Sensor socket (Blue
colour) from Control
panel
For fix the Defrost sensor make reverse steps as shown in
figure.

16
HOW TO ENTER INTO THE CONTROLLER PERAMETERS:
1) Open front panel
2) Press the set key for 3 seconds. The screen displays the PS menu. Press the
set button again, the screen displays zero, use up and down key to input
the password 22. Press the set key to confirm the password input. Then the
screen shows PS if the password is correct.
3) Temperature Setting: Press the set key for 1 sec the screen displays the Set
and set temperature will flash. Press up and down key to set the
temperature. Then press the set key to accept the new cabinet
temperature setting.
PROCEDURE TO REPLACE CAREL CONTROLER:
STEP 1 STEP 2
STEP 3
Remove the power box assembly
by unscrewing the two screws
placed on either side to the leg
control box. As shown in figure
Then unplug all the connectors
connected to power box assembly. Now
the power box is free from unit
assembly.
Unscrew the three
screws M4 X 8 fitted
to the control box
cover as shown in
figure

17
STEP 4 STEP 5
After the removal of top cover
CAREL CONTROLER is visible as
shown in figure.
Now remove the side brackets connected
on either sides as shown in figure.
Now the CAREL CONTROLER can be
removed from the power box
Replace it with new one and adopt the
procedure vice versa to reassemble the
power box
RELAY BASE OMRON PYF08A-E 2
POLE SOCKET
CAREL CONTROLLER PJEZCOP000
TYCO 10A CIRCUIT BREAKER W28-
XQ1A

18
1.
EVAPORATOR MOTOR 6. INPUT(PHASE)
2. NO CONNECTION 7. INPUT (NUTRAL)
8, 9,10. DEFROST AND APPLIANCE
SENSOR
3. DRAIN AND BODY HEATER
4. COMPRESSOR
CAREL CONTROLER CONNECTIONS

19
POWER BOX ASSY HFW-77:

20
PROCEDURE TO REPLACE DOOR GASKET:
Remove the old gasket by pulling it from any of the
four corner
After that fix the gasket into the groove from any one of
the four corners and then simply press looking that the
gasket if fixed into the groove throughout the door