Hoshizaki Temp Guard PTR1SSB01-10 User manual

ISSUED: 73102
SEPT. 24, 2002
NUMBER:
HOSHIZAKI
TempGuardTM PASS THROUGH
MODEL
PTR1SSB01-XX
SERVICE MANUAL
with
REVISED: JUNE9,2004

2
Only qualified service technicians should attempt to service or maintain this unit. No
service or maintenance should be undertaken until the technician has thoroughly read
this Service Manual.
HOSHIZAKI AMERICA, INC.
618Highway74South
PeachtreeCity,GA 30269
Attn: HOSHIZAKITechnicalSupportDepartment
Phone: [phone]TechnicalService
[phone]
Fax: [phone]
NOTE: Toexpediteassistance,allcorrespondence/communicationMUST includethefollowing
information:
•ModelNumber
•SerialNumber
• Completeanddetailedexplanationoftheproblem
IMPORTANT
HOSHIZAKI provides this manual primarily to assist qualified service technicians in the
service and maintenance of the unit.
Should the reader have any questions or concerns which have not been satisfactorily
addressed, please call or write to the HOSHIZAKI Technical Support Department for
assistance.

3
Pleasereviewthismanual. Itshouldbereadcarefullybeforetheunitisservicedormain-
tenanceoperationsareperformed.Onlyqualifiedservicetechniciansshouldserviceand
maintaintheunit. Thismanualshouldbemadeavailabletothetechnicianpriortoservice
ormaintenance.
CONTENTS
PAGE
I. ELECTRONICCONTROLOPERATION .................................................................. 4
1. NORMAL ELECTRONIC CONTROL PROCESS
FLOW......................................
OPERATION FOR REFRIGERATOR.............................................................. 4
2. TIME - TEMPERATURE CONTROL CHART FOR REFRIGERATOR............... 5
3. DISPLAY BOARD.............................................................................................. 6
4. ALARM / ALERT SIGNALS ............................................................................... 8
5. DEFROST........................................................................................................ 12
6. START-UP DELAY .......................................................................................... 13
7. PERIMETER FRAME HEATER....................................................................... 13
8. GLASS DOOR HEATER ................................................................................. 13
9. DIAGNOSTIC MENU ....................................................................................... 14
10. CONTROL BOARD.......................................................................................... 17
II. SERVICE DIAGNOSIS ........................................................................................ 19
III. REMOVAL AND REPLACEMENT OF COMPONENTS........................................ 23
1. SERVICE FOR REFRIGERANT LINES.......................................................... 23
2. BRAZING......................................................................................................... 24
3. REMOVAL AND REPLACEMENT OF COMPRESSOR................................... 25
4. REMOVAL AND REPLACEMENT OF DRIER ................................................. 26
5. REMOVAL AND REPLACEMENT OF EXPANSION VALVE ........................... 27
6. REMOVAL AND REPLACEMENT OF EVAPORATOR.................................... 28
7. REMOVAL AND REPLACEMENT OF DOOR GASKET .................................. 28
8. REMOVAL AND REPLACEMENT OF DOOR CLOSURE SPRING................. 29
9. REMOVAL AND REPLACEMENT OF CONTROL BOARD.............................. 30
10. DOOR RE-HINGING........................................................................................ 31
IV. CLEANING INSTRUCTIONS................................................................................ 32
V. WIRING DIAGRAM ............................................................................................. 33

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Note:
1) Cut-on / Cut-off / and Cabinet Temperature are read by the same sensor, called “cabinet
thermistor.
2) Defrost Thermistor reads Evaporator temperature.
I. ELECTRONIC CONTROL OPERATION
1. NORMAL ELECTRONIC CONTROL PROCESS FLOW OPERATION FOR REFRIGERATOR
POWER ON
Board Self Check
Display Read R##
(## is chip revision)
1) Frame heaters on
2) Evaporator fan on
2.5 minute delay
1. Compressor start-up
2. Condenser Fan start-up
Cycle Off (Cut-out
Temperature reached)
[Minimum2.5 minutes]
1) Compressor off
2) Condenser Fan off
(Normal Cycling)
Cycle On (Cut-on
Temperature reached)
[Minimum2.5 minutes]
1. Compressor on
2. Condenser Fan on
(Normal Cycling)
If evaporator temperature
reaches 10°F, unit initiates
defrost.
Compressor off
(Note: Condenser Fan and
Evaporator Fan are on.)
Evaporator temperature
reaches 40°F, defrost
terminated
Compressor on
Condenser Fan on
Continues as
Normal Cycling
Continuesas
normalcycling

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2. TIME - TEMPERATURE CONTROL CHART FOR REFRIGERATOR

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3. DISPLAY BOARD
The Display Board is located on the right hand side of the painted Control Panel between the top of
the Door and the Front Panel. From this area information regarding the functioning of the unit can be
obtained. From the Display Board various electronic controls and functions can also be adjusted.
Removing the Front Panel by lifting the panel up approximately one-half inch, then pulling it forward,
permits access to the Error Code Label, the Control Box and the Control Panel.

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When unit is turned on, first display is “R##”, where “##” indicates chip revision level.
1) TEMPERATURE DISPLAY
• The cabinet temperature is displayed (factory set is °F, but can be changed to read °C).
• The cabinet temperature is updated every 20 seconds.
2) GUARDED ACCESS MENU
Three settings can be viewed and changed from this menu:
1. TheTemperature Setpoint. This setpoint is the value for the average cabinet
temperature.
2. Defrost Frequency.
Automatic defrost. “df X” has no effect.
3. Units of Display. F = Fahrenheit, C = Celsius
To enter this menu, press and hold the up/down arrows together for 3 seconds. The
Temperature Setpoint will be displayed first. To change a value, push the up/down arrows until
the desired value is displayed. Then push “ENTER” to set the value and view the next setting.
If no change in the value is desired, press “ENTER”, and the next setting will be displayed.
At the end of the sequence, press “ENTER” and the unit will return to normal display mode.
Note: End sequence and press “ENTER” for changes to take effect. If sequence is
not ended by pressing “ENTER,” display will return to normal temperature
display and no changes will take effect.

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ALARM
3 beeps
every ten
seconds
4 beeps
every10
seconds
6 beeps
every10
seconds
RESET OPTIONS
Press “RESET.” If temp. has
returned to setpoint range, alarm
will stop and “E1” will clear.
If temp. is not back in range, “RE-
SET” will silence the alarm for 5
minutes. “E1” will continue to flash.
Press “RESET.” If temp. has
returned to setpoint range, alarm
will stop and “E2” will clear.
If temp. is not back in range, “RE-
SET” will silence the alarm for 5
minutes. “E2” will continue to
flash.
Press “RESET.” If pressure
switch resets automatically, alarm
will stop and “E4” will clear when
pressure switch closes.
If switch trips 5 times in 1
hour compressor will be
stopped, and not re-start. A
service technician must be
called.
For the Service Tech to reset this
alarm, press “RESET” on the
Control Board itself.
PROBLEM
Cabinet temp. has
exceeded set temp. by
10°F for more than 2
hours.
Cabinet temp. has
remained below setpoint
by 8°F for more than 1
hour.
Compressor discharge
pressure is outside
normal operating range.
Pressure switch has
been triggered 3 or
more times in 1 hour.
ERROR
MESSAGE
“E1” every 2
seconds,
alternating
with cabinet
temp.readout
“E2” every 2
seconds,
alternating
with cabinet
temp. readout
“E4” every 2
seconds,
alternating
with cabinet
temp.
4. ALARM / ALERT SIGNALS (*EXCLUDING GLASS DOOR MODELS)

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RESET OPTIONS
Alarm automatically resets when
acceptable voltage is detected.
Press “RESET” to silence alarm for
5minutes.
Alarm automatically resets when
acceptable voltage is detected.
Press “RESET” to silence alarm for
5minutes.
Clean filter. Allow time for sensor
to react, then press “RESET.”
During alarm, press “RESET” to
silence alarm for 2 hours.
If this alarm occurs frequently,
discharge temperature is consis-
tently too high.
Replace sensor.Alarm will reset.
During alarm press “RESET” to
silence buzzer for 5 minutes.
Replace sensor.Alarm will reset.
During alarm press “RESET” to
silence buzzer for 5 minutes.
PROBLEM
Line voltage is too
high.
Line voltage is too
low.
Condenser filter
needs cleaning.
Cabinettemp.sensor
has failed.
Defrost temp. sensor
has failed.
ALARM
8 beeps
every 10
seconds
9 beeps
every 10
seconds
1 beep
every 10
seconds
Continuous
buzzer
Continuous
buzzer
ERROR MESSAGE
“E6” every 2 sec-
onds, alternating with
cabinettemp.
“E7” every 2 sec-
onds, alternating with
cabinettemp.
“CF” every 2 sec-
onds, alternating with
cabinettemp.;
“CLEAN FILTER”
LED lights.
“E8” every 2 seconds
“E9” every 2 sec-
onds, alternating with
thecabinettemp.

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a) HIGH TEMPERATURE ALARM FUNCTION
When cabinet temp. has exceeded set temp. by 10°F or more for more than 2 hours,
an alarm buzzer sounds 3 beeps every 10 seconds, and an error message “E1” flashes
every 2 seconds, alternating with the cabinet temperature readout.
Reset Options:
If temperature has returned to setpoint range, pressing “RESET” on the Display Board will stop
the buzzer and clear the “E1” message.
If temperature is not back in range, pressing “RESET” on the display board will silence the
buzzer for 5 minutes. The “E1” message will continue to flash.
Note: Setting DIAGNOSTIC MENU item 3 to ON resets all alarms regardles of whether or not
setpoints are reached. This is a complete clearing of all alarms. See DIAGNOSTIC
MENU for details.
b) LOW TEMPERATURE ALARM FUNCTION
When the cabinet temperature has been below the setpoint by 8°F for more than 1 hour, the
buzzer will sound 4 beeps every 10 seconds, and “E2” will flash every 2 seconds, alternating
with the cabinet temperature readout.
Reset Options:
If temperature has returned to setpoint range, pressing “RESET” on the Display Board will stop
the buzzer and clear the “E2” message.
If temperature is not back in range, pressing “RESET” on the Display Board will silence the
buzzer for 5 minutes. The “E2” message will continue to flash.
Note: Setting DIAGNOSTIC MENU item 3 to ON resets all alarms regardles of whether or not
setpoints are reached. This is a complete clearing of all alarms. See DIAGNOSTIC
MENU for details.