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

4
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

6
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.

7
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.

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c) HIGH PRESSURE ALERT FUNCTION
In order to protect the compressor if the discharge pressure reaches a preset value (outside the
normal operating range), a switch will temporarily stop the compressor. At another preset
pressure, the compressor will attempt to restart. If the switch is triggered 3 times in 1 hour, the
buzzer will sound 6 beeps every 10 seconds, and “E4” will flash every 2 seconds, alternating
with the cabinet temperature. The same sequence will occur if the switch trips the fourth time in
1hour.
Reset Options:
During the third and fourth trip alarm, the buzzer can be silenced by pressing “RESET” on the
Display Board.
The buzzer and display will automatically reset when the pressure switch closes after the 3rd
and 4th reset.
After the 5th pressure trip, the buzzer can be silenced for 1 hour by pressing “RESET” on the
Display Board.
IMPORTANT
If the switch trips 5 times in 1 hour, the compressor will be stopped, and a service technician
must be called.
For the Service Tech to reset this alarm, press “RESET” on the Control Board itself.
d) HIGH VOLTAGE ALERT FUNCTION
When the unit detects the line voltage is above a preset value for 10 seconds, to protect the
compressor, the compressor will shut down. The buzzer will sound 8 beeps every 10 seconds.
“E6” will flash every 2 seconds, alternating with the cabinet temperature.
Reset Options:
This alarm automatically resets when an acceptable voltage is detected.
The buzzer can be silenced for 5 minutes while in alarm by pressing “RESET” on the Display
Board.
e) LOW VOLTAGE ALERT FUNCTION
When the unit detects the line voltage is below a preset value for 10 seconds, to protect the
compressor, the compressor will shut down. The buzzer will sound 9 beeps every 10 seconds.
“E7” will flash every 2 seconds, alternating with cabinet temperature.
Reset Options:
This alarm automatically resets when an acceptable voltage is detected.
The buzzer can be silenced for 5 minutes while in alarm by pressing “RESET” on the Display
Board.

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f) CLEAN FILTER ALERT FUNCTION
The unit is equipped with a filter for protecting the condenser from dirt, oils, grease, etc. The filter
promotes clean condenser surfaces and efficient operation and should be checked monthly and
cleaned when necessary. The unit is also equipped with a sensor to determine if this filter is
excessively dirty. If the unit detects that the condenser filter is excessively dirty, it will flash “CF”
every 2 seconds, alternating with the cabinet temperature. The “CLEAN FILTER” LED will light
up and the alarm buzzer will sound 1 beep every 10 seconds.
After cleaning the filter, allow time for the sensor to react, then press “RESET” on the Display
Board to reset the alarm.
During the alarm, pressing “RESET” on the Display Board will silence the alarm buzzer for
2 hours.
IMPORTANT
If this alarm occurs frequently, the compressor discharge temperature is consistently too high.
Note: If in alarm, and press reset during off cycle, may reset alarm even if filter is not yet clean.
However, alarm will reactivate when compressor discharge temperature indicates clogged
filter.
g) SENSOR ERROR
This unit uses two sensors to monitor internal temperatures:
Sensor #1: Cabinet Temperature Sensor. If this sensor fails, a continuous buzzer sounds
and “E8” will flash every 2 seconds, alternating with the sensor’s interpretation of cabinet
temperature.
Sensor #2: Defrost Temperature Sensor. If this sensor fails, a continuous buzzer sounds
and “E9” will flash every 2 seconds, alternating with the cabinet temperature.
These alarms automatically reset when a functioning sensor is installed.
During the alarm, pressing “RESET” on the display board will silence the buzzer for 5 minutes.
5. DEFROST
This unit uses an off cycle defrost. A sensor in the evaporator coil determines the need for a
defrost. When the sensor reaches the initiation setpoint, the unit enters defrost. When the unit
reaches the termination setpoint, the unit ends defrost. The off cycle defrost requires no
programming; it automatically initiates and terminates.
Note: In the program menu (#1=T set, #2=dF set, #3=° F or °C set), dF=x has
no effect.

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6. START-UP DELAY
The start circuit of the compressor is timed such that at power-up and during any compressor
off time, there will be at least a 2 1/2 minute delay before the compressor will start.
Note: The compressor must run 2 1/2 minutes minimum during every run cycle.
7. PERIMETER FRAME HEATER
This unit is equipped with a perimeter frame heater. This prevents the formation of condensate
on the front frame of the unit under high humidity conditions. If operating the unit under
conditions where condensate will not form, these heaters may be turned off using the switch
on the control box.
8. GLASS DOOR HEATER
Glass Doors are equipped with a door heater. This prevents the formation of condensate on the
glass or frame under high humidity conditions. If operating unit under conditions where conden-
sate will not form, these heaters may be turned off using the switch on the control panel.

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9. DIAGNOSTIC MENU
Access to Diagnostic Menu is gained by pressing and holding the up/down arrows and
ENTER button together for three seconds. Scroll through menu options using the “ENTER”
button. Change options using up/down arrows. Reset alarm conditions using “RESET”
button. To exit, press “ENTER” button until normal display returns. To exit diagnostic menu
at any point in the menu, press and hold “ENTER” button for three seconds. Diagnostic
menu will remain on display for 10 minutes after the last keystroke, then automatically revert
to normal operation mode (cabinet temperature display). All information given in degrees will
automatically convert to the appropriate programmed scale (Fahrenheit vs. Celsius).
DISPLAY DEFINITION
1OFF Displays Cabinet Temperature.
1 ON Displays Evaporator Temperature. Display will automatically revert to
cabinet sensor after five minutes.
2OFF/ON Has no effect on Pass Through models.
3OFF Unconditional alarm reset option not activated.
3 ON Unconditional alarm reset option activated. Changing from 3OFF to 3 ON
resets all alarm display codes, all at the same time. This is a complete
clearing of alarms.
4 16 Number in right two digits represents Compressor run time in last 24 hours
to the nearest hour. Example: 16 hours total run time in the last 24 hours.
Valueis every24 hours.
5 50 Number in right two digits represents percent Compressor on time for the
last 5 run cycles. A run cycle begins when the Compressor switches from
off to on and ends the next time it switches from off to on. Example: 50%
run time over the last 5 run cycles.
Value is calculated as follows: Percent on time=On time last 5 cycles/total
timelast 5cycles.
Note: “On time last 5 cycles” does not include an on time that was
terminated by a defrost cycle or the first on time after a defrost,
and “Total time last 5 cycles” does not include an on or off time
that was terminated by a defrost cycle, the time spent in defrost
or the first on time after a defrost.
Valueis savedevery5 cycles.

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6 45 Number in right three digits represents Compressor run time for the last
run cycle. Example: 45 minutes of Compressor run time in last run cycle.
7 45 Has no meaning on Pass Through models.
8 67 Number in right two digits represents highest temperature recorded during
the last high temperature alarm. Example: Temperature reached 67
degrees during last high temperature alarm. Display will “8--” if there has
not been a high temperature alarm.
Value is saved every 8.5 minutes when in alarm.
9-10 Number in right three digits represents lowest temperature recorded during
the last low temperature alarm. Example: Temperature reached
-10 degrees during the last low temperature alarm. Display will show “9--” if
there has not been a low temperature alarm.
Value is saved every 8.5 minutes when in alarm.
The diagram below is an example of a run cycle:

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Evercheck Display Board
IF DISPLAY REASON
READS
CF AIR FILTER ELEMENT NEEDS CLEANING.
E1 WHENCABINETTEMPERATUREHAS EXCEEDEDSETTEMPERATUREBY
10°F OR MORE FOR MORE THAN 2 HOURS.
E2 CABINET TEMPERATURE 8°F BELOW SETPOINT FOR 1 HOUR OR
MORE.
E4 HIGH PRESSURE ALARM. UNIT OPERATING ON HIGH PRESSURE
SWITCH. CALL FOR SERVICE.
E6 HIGH VOLTAGE ALARM. LINE VOLTAGE IS HIGHER THAN RATED
VOLTAGE.
E7 LOW VOLTAGE ALARM. LINE VOLTAGE ISLOWER THAN RATED
VOLTAGE.
E8 CABINET TEMPERATURE SENSOR FAILURE.
E9 DEFROSTTEMPERATURESENSORFAILURE.

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10. CONTROL BOARD
1) A HOSHIZAKI exclusive solid-state control is employed in all Hoshizaki Pass Throughs.
2) A Printed Circuit Board (“Control Board”) includes a stable and high quality control system.
3) All models are pretested and factory-adjusted.
CAUTION
1. Fragile, handle very carefully.
2. A controller board contains integrated circuits, which are susceptible to failure due to
static discharge. It is especially important to touch the metal part of the unit when
handling or replacing the board.
3. Do not touch the electronic devices on the board or the back of the board to prevent
damage to the board.
4. Do not fix the electronic devices or parts on the board in the field.
Always replace the whole board assembly when it goes bad.
5. Do not short out power supply to test for voltage.
6. Keep the Thermistors, Clean Filter leads, Door Switch leads, Pressure Switch leads
and Ribbon Cable at least 1 1/2” away from high voltage leads (AC 100 volts or
more) to protect against electrical noise.

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A: CondenserFan Relay
B: Compressor Relay
C: Defrost Heater Relay
D: Door Heater Relay
E: Evaporator Fan Relay
High Voltage Legend:
brown: Power to Condenser Fan, after
relaycontactmade
black #1: Power to Condenser Fan
Relay before contact
gray: Power to external Compressor
Relay, after Board Relay contact made
black #2: Power to Compressor Relay
(Board)beforecontact
lt. blue: Power to Door Heater after
contact
dk. blue: Power to Evaporator Fan after
contact
black #3: Power to Evaporator Fan Relay
beforecontact
CONNECTORS
K1 white
K2 white
K3 white
K4 red
K5 black
K6 white
K9 red Note: Above each relay is a light. For the Condenser Fan,
Compressor, Heater, and Door Relays, the light “on”
indicates that the component is receiving power, and the
light “off” indicates the component is not receiving power
from the Board. For the Evaporator Fan Relay the
opposite is the case; the light “off” indicates that the
Evaporator Fan is receiving power, and the light “on”
indicates that the Evaporator Fan is not receiving power
from the Board.
Low Voltage Legend:
pink: Clean Filter Switch
violet: High Pressure Switch
Evercheck Control Board

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II. SERVICE DIAGNOSIS
a) Power Supply
b)CordandPlug
c)Ground Fault Circuit
Interrupter
d)Transformer
e)Wiringto Controller
Board
f)Voltage
g)HighPressure
Switch
h)Thermistor
i)ControllerBoard
j)Compressoroverload
k)Compressor
l)Relay(Condensing
Unit)
a)Voltage
b) Start Relay
c)Compressor
d)StartCapacitor
1)“OFF”position
2)Looseconnection
3)Failure
4)208/230volt;wrong leg to
power control board
1)Defective
1)Tripped
2)Defective
1)OpenCoil Winding
1)Looseconnection
2) Faulty
1)Too low
2)Toohigh
3)208/230volt;wrong leg to
power control board
1) Bad contacts
2)Hasoperated 5 or more
times in one hour. (E4
should be displayed)
1)Defective
1)Defective
1)Defective(Contacts open)
1)OpenWindings
1) Bad Contacts
2)OpenCoilWinding
1)TooLow
1) Bad Contacts
2)OpenCoilWindings
1)LockedRotor
1)Defective
PROBLEM POSSIBLE CAUSE REMEDY
Compressor will
not start—no
currentdraw.
Compressorwill
notrun—draws
currentandtrips
onoverload.
1) Move to “ON” position.
2)Tighten.
3)Call electrician.
4)Correctwiring.
1)Replace.
1) Check and reset.
2)Replace.
1)Check for continuityand
replace.
1)Tighten.
2) Check continuity and
replace.
1)Call electrician.
2)Call electrician.
3)Correctwiring.
1) Check continuity and
replace.
2)Press“RESET” on Control
Board. Determine why
Pressure Switch is
activated.
1)SeeThermistorService
Procedure.
1)ReplaceControlBoard.
1)Replace.
1) Check continuity and
replace.
1)Replace.
2)Checkand Replace.
1)Call electrician.
1)Replace.
2)Replace.
1)Replace.
1)Checkand replace.

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a) Voltage
b)CondenserFilter
c)RefrigerantLineor
Component
d)CondenserFan
Motor
e)Refrigerant
f)Location of unit
a) Thermistor defective.
b) Compressor Relay defective. (LED 4 is ON. 115V to
Relay Coil.)
c) Circuit Board defective. (LED 4 is OFF. Compressor
Relay Coil not energized at 115V.)
a)Setpoint incorrect.
b) Door not sealing, or open for long intervals.
c) Refrigerant leak
d) Fan Motor defective
e) Air Filter clogged
f)Condenser dirty
g) Thermistor defective
h) Control Board defective
Compressor runs
intermittentlyand
tripson overload.
Cabinet inside
temperaturetoo
high;Compressor
will not start.
Cabinetinside
temperaturetoo
high
1)Call electrician.
1)Call electrician.
1)Cleanfilter.
1)Cleanandreplacedrier.
1)Replace.
1)Evacuateandrecharge.
2)Evacuateandrecharge.
1) Move unit or increase
ventilation.
1) See Thermistor service
procedure.
1) Check and replace.
1) Replace.
1)Correct setpoint. Factory
default: 36°F.
1) Check for sealing, check
for door open at time of
warm cabinet temperature.
1) Repair leak and recharge.
1) Check and replace.
1)Clean.
1)Clean.
1) See Thermistor Service
Procedure.
1) Replace.
1) Too low
2)Toohigh
1)Clogged
1)Pluggedor restricted
1)Failed
1)Overcharge
2)Non-condensiblesin
system
1) Restricted air flow to
condenser
PROBLEM POSSIBLE CAUSE REMEDY