Avantco 178Z1FHC User manual

Service Manual Service Manual
Commercial Top Mount Reach-In Freezer
- 1 -
Solid door: 178Z1FHC, 178Z1FWMS, 178Z2FHC, 178Z2FWMS
NOTICE
• This manual is for a certified service technician and should not be used by those who are not properly trained.
• This manual cannot cover all possible conditions that may occur and is not intended to be all encompassing.
• You should read this manual in its entirety and the specific repair you wish to do prior to starting the repair.
• This will allow you to determine if you have the correct tools, instruments, and skills to perform the procedure.
03/2023
Service Manual

P. 2
Service Manual
Troubleshooting....................................................................................................................................................... 3
Part Testing ............................................................................................................................................................... 5
Controller Testing.................................................................................................................................................... 5
Evaporator Fan Motor Testing ............................................................................................................................. 5
Condenser Fan Motor Testing ............................................................................................................................. 5
Temperature Probes, Evaporator, Cabinet, Condenser ................................................................................ 5
Defrost Heater Element......................................................................................................................................... 6
Evaporator pan heat element .............................................................................................................................. 6
Drain line heater...................................................................................................................................................... 6
Door frame heater................................................................................................................................................... 6
Compressor and Capacitor .................................................................................................................................. 7
Temperature Controller Settings......................................................................................................................... 8
Part Repair................................................................................................................................................................. 11
Evaporator Parts ...................................................................................................................................................... 11
Evaporator Fan Blade ............................................................................................................................................ 11
Evaporator Fan Motor ............................................................................................................................................ 11
Cabinet Temperature Sensor............................................................................................................................... 12
Evaporator Coil ........................................................................................................................................................ 12
Condenser Parts...................................................................................................................................................... 13
Condenser coil......................................................................................................................................................... 13
Condenser Fan Blade ............................................................................................................................................ 13
Condenser Fan Motor............................................................................................................................................ 13
Capacitor ................................................................................................................................................................... 14
Compressor .............................................................................................................................................................. 14
Filter Drier.................................................................................................................................................................. 14
Wire Diagram............................................................................................................................................................ 15
178Z1RHC............................................................................................................................................................. 15
178Z1RWMS ......................................................................................................................................................... 15
178Z2RHC............................................................................................................................................................ 16
178Z2RWMS........................................................................................................................................................ 16
Parts Diagram List ................................................................................................................................................... 17
178Z1RHC............................................................................................................................................................. 17
178Z1RWMS ......................................................................................................................................................... 17
178Z2RHC............................................................................................................................................................ 18
178Z2RWMS........................................................................................................................................................ 18

P. 3
Service Manual Service Manual
Problem Possible Solution
Unit turns o before
reaching set temperature
Ensure proper voltage on the plug
Ensure condenser coil is clean
Ensure controller is sending power to compressor
Check compressor for power
Inside cabinet fan not
working
Check parameters on controller
Check controller is telling evaporator fan to run
Check door switch
Check evaporator fan motor
E3 error showing on the
controller
Ensure wiring into controller is secure
Check condenser temperature probe
E1/rE/999 is showing on
the controller
Ensure wiring into controller is secure
Check cabinet temperature probe
E2 error showing on the
controller
Ensure wiring into the controller is secure
Check evaporator coil temperature probe
Continued on next page
Troubleshooting

P. 4
Service Manual
Problem Possible Solution
Unit will not turn on Ensure that unit is plugged in
Ensure the outlet is correct and dedicated and has power
Check power switch
Check controller
Unit not getting to set
temperature
Ensure door is properly closed
Check door gasket for rips, tears, cut, etc.
Ensure condenser coil is clean
Ensure set temperature is correct
Ensure default parameters are correct on the controller
Check evaporator coil for ice or frost buildup
Check if evaporator fan(s) is operating
Check if condenser fan is operating
Check cabinet temperature sensor
Check compressor operation
Unit not holding set
temperature
Ensure condenser coil is clean
Ensure evaporator coil is clean and not frozen
Check door gasket is free of rips, tears, cuts, etc.
Ensure cabinet inside has good air circulation and not blocking evaporator fan
Check if evaporator fan is operating
Check if condenser fan is operating
Check door switch
Ensure parameters are correct on controller
Check cabinet temperature sensor
Ensure defrost heating element is not on
Check compressor operation
Water coming
from inside cabinet
drain/pan
Check parameters are correct on controller
Check drain pan hose for clog
Check evaporator fan and motor
Compressor is not
running
Ensure unit is plugged in and turned ‘ON’
Ensure controller parameters are correct
Check controller is telling compressor to run
Check start capacitor
Check compressor for power
Check thermal-overload on compressor

P. 5
Service Manual Service Manual
Part Testing
Controller Testing
(Fig. 1)
- Check for 120 volts between black (L) and white (N)
wires, main power, orange terminal connector.
- Check for 120 volts between red (compressor) and
white (N) wires, compressor ON only.
- Check for 120 volts between yellow (fan) and white
(N) wires, fan ON only.
Evaporator Fan Motor Testing
Ensure controller is calling for evaporator fan to run
(Fig. 2) and door switch is closed then:
- Check for 120 volts between yellow (fan) and white
(N) wires, fan ON only.
- Check for 0.5 amps+/- 10% at yellow wire at rear of
controller.
If tests above fail, replace fan motor.
Condenser Fan Motor Testing
Ensure controller is calling for compressor to run
then: (Fig. 3)
- Check for 120 volts at fan plug between the wires.
- Check for 0.5 amps +/- 10% on red wire.
If tests above fail, replace fan motor.
Test probe while it is in ice water as temperature
eects ohm reading: 26 kiloohms (kΩ) +/-10% = good.
If tests above fails, replace probe.
Fig. 1
Fig. 2
Fig. 3
Temperature Probes, Evaporator,
Cabinet, and Condenser

P. 6
Service Manual
Defrost Heater Element
Controller must be in defrost mode (Fig. 4)
- Check for 3.6 amps +/- 10% on the gray (power) wire
at the plug.
- Check for 120 volts between gray (power) wire at
the plug end and the white (neutral) wire at the
controller.
- Check for 330Ωat 70°F with power disconnected
at the plug end between the gray and white wires.
Evaporator pan heat element
Controller must be in defrost mode (Fig. 5)
- Check for 0.27 amps +/- 10% on the gray (power)
wire at the plug.
- Check for 120 volts between the gray (power) wire
at the plug end and the white (neutral) wire at the
controller.
- Check for 390Ωat 70°F with power disconnected
at the plug end between the gray and white wires.
Drain line heater
Unit must be turned ‘ON’ (Fig. 6)
- Check for 0.3 amps +/- 10% on the black wire at the
plug.
- Check for 120 volts between the black (power) wire
at the plug end and the white (neutral) wire at the
controller.
- Check for 392Ωat 70°F with power disconnected at
the plug end between the black and white wires.
Door frame heater
Unit must be turned ‘ON’ (Fig. 7)
- Check for 0.24 amps +/- 10% on the black wire at
the plug.
- Check for 120 volts between the black (power) wire
at the plug end and the white (neutral) wire at the
controller.
- Check for 447Ω at 70°F with power disconnected at
the plug end between the black and white wires.
Fig. 4
Fig. 5
Fig. 6 Fig. 7
Part Testing

P. 7
Service Manual Service Manual
With the unit ‘ON’ and the controller calling for
compressor to run then:
- Check for 120 volts at main compressor plug
between the red and white wires (Fig. 8)
- Check for amperage +/- 10% on the red wire.
If amperage is above running amps and below locked
rotor amps, replace starting components. Reference
table at right for amps.
If amperage is at Locked Rotor Amps, replace
compressor.
With the unit ‘OFF’ and disconnected from the power
supply, disconnect wiring from the compressor. Check
resistance from common to run and start windings.
Resistance should be found using the following
equation:
(Run to Start = (Run to Common) + (Start to Common))
Temperature will change resistance OHM values.
Check windings are not connected to ground by
check OHMs from each pin to shell of the compressor
(paint must be removed from the case when checking
for grounding).
Capacitor checks:
Visually check for any deformations or leaking oil-like
fluids. Replace if any are found.
Discharge capacitor prior to testing. Use a 20,000
ohm, 2 watt resistor, caution resistor will be HOT
during discharge.
Replace if micro-farads are not with +/- 10%
Fig. 8
NOTE: It is recommended that if the
compressor fails to ensure that the condenser
fan is operating correctly.
Model # Max Load
Amps
Locked Rotor Amps
(LRA)
178Z1RHC 3.6 Amps 22.4 Amps
178Z2RHC 7.2 Amps 44.1 Amps
Part Testing
Compressor and Capacitor
Fig. 9

P. 8
Service Manual
Temperature Controller Settings
1. To access settings on temperature controller,
press the ‘PROGRAM’ button until the display
shows three dashes and the ‘SET’ button. (Fig. 10)
2. Press the ‘SET’ button to make the ‘SET’ and
‘ON-OFF’ flash.
3. Push the ‘SET/Up Arrow’ button or ‘ON-OFF/
Down Arrow’ button to change.
3. Press the ‘Program’ button to save the new set
temperature.
‘PROGRAM’ button =
‘SET/Up Arrow’ button =
‘ON-OFF/Down Arrow’ button =
Fig. 10
You must download the app to your phone in
order to gain full access to the parameters of
this controller.
Once the app is installed on your phone, open
the app and ensure your phone’s NTC con-
nection is turned ‘ON’.
Get your phone’s NTC transmitter as
close as you can to the controller for the
quickest access.
Service password is ‘22’.

P. 9
Service Manual Service Manual
Temperature Controller Settings
Code Description Options Defaults
/5 Unit of measure °C or °F °F
/6 Display decimal point Visible or Not Visible Visible
Ad Timed delay for high &
low temperature alarm 0 to 240 minutes 60 minutes
Add High temperature alarm
bypass via door open 1 to 240 minutes 15 minutes
AHA High temperature alarm -148°F to 999°F 18°F
ALA Low temperature alarm -148°F to 999°F -14°F
d6 Display during defrost
0 = Temperature alternat-
ing with “dEF”
1 = last temperature before
defrost
2 = ‘dEF’
1
d8 High temperature alarm
bypass after defrost 1 to 240 hours 1 hour
dl Defrost intervals 0 to 240 hours 6 hours
dP1 Maximum defrost length 1 to 240 minutes 40 minutes
dt1 Defrost end temperature 58°F to 122°F 50°F

P. 10
Service Manual
Temperature Controller Settings
Code Description Options Defaults
F0 Evaporator fan manage-
ment
0 = always ON
1 = activation based on Sd - Sv
2 = activation based on Sd
3 = activation based on Sv
0
F1
Evaporator activation
temperature
(ONLY IF F0 = 1,2,3)
-58°F to 122°F
41°F
F2 Evaporator fan o with
compressor
0 = see F0 setting
1 = Always OFF with
compressor o
2 = ON for Anti-stratification
3 = ON for humidity control
1
F3 Evaporator fans during
defrosts
0 = ON
1 = OFF 1
Hb Buzzer 0 = disabled
1 = enabled 1
rd Temperature control
dierential 0.2°F to 179.2°F 36°F
st Temperature set point r1 to r2 -7.6°F