Avantco 178APT27HC User manual

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.
REVISED: 05/2022
NOTICE
Service Manual
Refrigerated Sandwich Prep Tables
#178APT27HC 27" 1 Door Refrigerated Sandwich Prep Table
#178APT27MHC 27" 1 Door Mega Top Refrigerated Sandwich Prep Table
#178APT48HC 48" 2 Door Refrigerated Sandwich Prep Table
#178APT48MHC 48" 2 Door Mega Top Refrigerated Sandwich Prep Table
#178APT60HC 60" 2 Door Refrigerated Sandwich Prep Table
#178APT60MHC 60" 2 Door Mega Top Refrigerated Sandwich Prep Table
#178APT71HC 71" 3 Door Refrigerated Sandwich Prep Table
#178APT71MHC 71" 3 Door Mega Top Refrigerated Sandwich Prep Table

2
Troubleshooting ................................................................................................... 3
Temperature Controller Settings ......................................................................... 4
Part Testing........................................................................................................... 7
Compressor & capacitor............................................................................. 7
Controller..................................................................................................... 8
Evaporator fan motors ................................................................................ 8
Condenser fan motor .................................................................................. 9
Door seal heater.......................................................................................... 9
Part Replacement ................................................................................................. 9
Controller..................................................................................................... 9
Condensing tray components ................................................................... 10
Compressor................................................................................................ 10
Capacitor .................................................................................................... 10
Filter drier ................................................................................................... 11
Condenser fan cover.................................................................................. 11
Condenser fan blade.................................................................................. 11
Condenser fan motor ................................................................................. 11
Condenser coil ........................................................................................... 11
Evaporator compartment parts.................................................................. 12
Turn off and disconnect power before servicing...................................... 12
Evaporator fan motors ............................................................................... 12
Evaporator coil ........................................................................................... 12
Wire Diagram....................................................................................................... 14
178APT27HC .............................................................................................. 14
178APT48HC .............................................................................................. 15
178APT60HC .............................................................................................. 16
178APT71HC .............................................................................................. 17
Parts Diagram List............................................................................................... 18
178APT27HC .............................................................................................. 18
178APT48HC .............................................................................................. 20
178APT60HC .............................................................................................. 22
178APT71HC .............................................................................................. 24
Table of Contents

3
Troubleshooting
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 all pans are installed on top
Ensure ambient air is above 85°F
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 compressor operation
Check cabinet temperature sensor
Unit not holding set
temperature
Ensure all pans are installed on the top
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
Ensure parameters are correct on controller
Check cabinet temperature sensor
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

4
Temperature
Controller Settings
1. To access settings on temperature
controller, press and hold the "SET" button
until the display flashes with "PS". (Fig. 2)
2. Press the "SET" button again to display a
blinking "0".
3. Push the "up arrow/power" button until the
display shows 22.
4. Press the "Set" button to enter the
programming mode of the controller.
5. To save any changes that are made, press
and hold the "SET" button until the set point
temperature shows on the controller display.
P5 = Password setting
0 to 200 is range setting
Default = 22 (recommend not to change)
(Fig. 2)
/5 = Temperature select °C / °F
0 = °C
1 = °F
Use up or down arrow to change from 0 or 1,
then press "Set" button to keep the option.
Default = 1 (Fig. 3)
Mode Setting Display
/5 1 Temperature Unit F/C
/c1 0 Cabinet Oset
/c2 0 Evap Oset
rd 7 Dierential
rl 33 Low Limit
r2 43 Hi Limit
C0 2 Compressor Delay
dl 6 Defrost Interval Time
dt1 N/A Defrost Termination Temp
dP1 20 Max Defrost Duration
Fig. 1
Fig. 2
Fig. 3

5
Temperature
Controller Settings
/C1= Probe 1 differential
-50.0° to 50.0°;
Default = 0° (Fig. 4)
Use up or down arrow to change, then press
"Set" button to keep the option.
/C2 = Probe 2 differential
(Not used on Refrigerators)
(Fig. 5)
rd = Set temperature differential
0°F to 19°F is adjustment range
Default = 5°F (Fig. 6)
Use up or down arrow to change, then press
"Set" button to keep the option.
r1 = Minimum set temperature allowed
-50°F to r2
Default = 33°F (Fig. 7)
Use up or down arrow to change, then press
"Set" button to keep the option.
r2 = Maximum set temperature allowed
r1 to 200°
Default = 43° (Fig. 8)
Use up or down arrow to change, then press
"Set" button to keep the option.
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8

6
Temperature
Controller Settings
c0 = Compressor and fan start delay
0 to 100 minutes
Default = 2 minutes (Fig. 9)
Use up or down arrow to change, then press
"Set" button to keep the option.
dl = Time between defrosts
0 to 199 hours
Default = 6 hours (Fig. 10)
Use up or down arrow to change, then press
"Set" button to keep the option.
dt = Defrost end temperature or set point
-50°F to 130°F
Not used on refrigerators (Fig. 11)
Use up or down arrow to change, then press
"Set" button to keep the option.
dP = Maximum defrost time
1 to 199 minutes
Default = 20 minutes (Fig. 12)
Use up or down arrow to change, then press
"Set" button to keep the option.
Fig. 9
Fig. 10
Fig. 11
Fig. 12

7
Part Testing
Compressor & Capacitor
With unit 'ON' and controller calling for
compressor to run, check amperage on 'RED'
wire coming from the back of the controller; 2.0
amps +/- 10%
If amperage is above running amps and below
locked rotor amps replace starting components.
If amperage is at Locked Rotor Amps,
compressor needs replaced.
Disconnect wiring from compressor, check
resistance from common to run and start
windings. Resistance should be found (Run to
Start = (Run to Common) + (Start to Common).
Temperature will change resistance OHM.
Check windings are not connected to ground by
checking for Ohms from each pin to the shell of
the compressor (Paint must be removed from
case when checking for grounding).
Visually check capacitor for any deformations or
leaking oil like fluids, replaced if any is found.
Discharge capacitor prior to testing, use a
20,000 ohm, 2 watt carbon resistor, caution
resistor will be HOT during discharge.
Capacitor micro-farads = 12µF +/- 5%, replace
if not within range.
Fig. 13
Fig. 14
Fig. 15
Model # Max Load
Amps
Locked Rotor Amps
(LRA)
178APT27HC 4.5 Amps 16.4 Amps
178APT27MHC 4.5 Amps 16.4 Amps
178APT48HC 6 Amps 18.4 Amps
178APT48MHC 6 Amps 18.4 Amps
178APT60HC 6.5 Amps 18.4 Amps
178APT60MHC 6.5 Amps 18.4 Amps
178APT71HC 8.9 Amps 28.6 Amps
178APT71MHC 8.9 Amps 28.6 Amps

8
Part Testing
Controller
Check for 120 volts between white (N) and
black (L) (#4) at the back of the controller.
NOTE: there are two black (L) wires. (Fig. 16)
With controller calling for compressor to
run, check for 120 volts between white
(N) and red (Compressor) wire. (Fig. 16)
Check for any discoloration or deformations of
electrical connections, if any are found,
replace connections.
Condenser Fan Motor
Check for 120 volts at the condenser fan plug,
between white and black wires when controller
is calling for compressor to run. (Fig. 18)
Check for 0.5 amps at black wire when
controller is calling for compressor to run.
Check for any discoloration or deformations of
electrical connections, if any are found,
replace connections.
Evaporator Fan Motors
Check for 120 volts between white (N) and
black (L) at the back of the unit. (Fig. 17)
Check for 0.7 amps at black wire when unit is
plugged in.
Check for any discoloration or deformations of
electrical connections, if any are found,
replace connections.
Fig. 16
Fig. 18
Fig. 17

9
Part Testing
Part Replacement
Turn off and disconnect power
before servicing
Door Seal Heater
Disconnect unit from power and unplug red
connector, check for 228 Ω at 70°F +/- 10%.
(Fig. 19)
Check for 120 volts between white and black
wires on the red plug at rear of condenser/
compressor compartment. (Fig. 19)
Check for 0.5 amps on black wire after red
connector. (Fig. 19)
Check for any discoloration or deformations of
electrical connections, if any are found,
replace connections.
Fig. 19
Fig. 20
Fig. 21
Fig. 23Fig. 22
Controller
1. Remove control panel from the rear of
the unit by removing the 4 Phillips screws
holding the controller to the unit. (Fig. 20)
2. Remove controller top cover by pulling away
from front of controller. (Fig. 21)
3. Push in yellow brackets on sides of
controller and slide towards rear of
controller. (Fig. 22)
4. Push controller through cutout in control
panel.
5. Remove wires from rear on controller, note
location for new controller. (Fig. 23)
6. Installation is reverse of removal.

10
Part Replacement
Condensing Tray
Components
Compressor
1. Remove Phillips screws holding rear
condenser cover in place. (Fig. 24 & 25)
2. Remove 2 Phillips head screws hold
condensing tray inside unit. (Fig. 26 & 27)
3. Pull condensing tray out to access
compressor. Ensure wiring is long enough or
disconnect if needed, also watch line sets do
not bind up.
All EPA, federal and local guidelines need to
be followed when working with refrigeration.
Follow all guidelines and safety procedures
when working with a flammable refrigerant.
All connections where refrigerant travels
must be checked for leaks after connections
are brazed in place.
4. Remove discharge and suction lines to
compressor and follow all EPA regulations
regarding refrigeration.
5. Remove wiring cover cap from compressor
with a flat screw driver, insert into tab, push
down on screw driver and rotate cover away
from compressor (Fig. 28)
6. Remove wiring from compressor by pulling
off of pins, note locations for new compressor
(Fig. 29)
7. Remove 4 hex head bolts holding compressor
onto condensing tray with a 10 mm socket
(Fig. 30)
8. Ensure capacitor is properly discharged before
proceeding. Use a 20,000 ohm, 2 watt carbon
resistor. Caution as resistor will be HOT during
discharge.
9. With wires removed from compressor, remove
wiring for capacitor (blue and brown wires
inside white sleeve) from relay.
10. Unbolt from underside of tray
with a 10 mm socket. (Fig. 31)
Capacitor
Fig. 26
Fig. 24
Fig. 28
Fig. 30
Fig. 27
Fig. 25
Fig. 29
Fig. 31

11
Part Replacement
Condensing Tray
Components Cont.
Fig. 32
Fig. 34
Fig. 36
Fig. 38
Fig. 33
Fig. 37
11. With condensing tray pulled out, remove by cutting
process tube and liquid line to filter. (Fig. 32)
12. Remove from clamp by prying apart clamp clip.
13. With all refrigerant removed from system and a
safe working condition, sweat out the capillary
tube from the filter drier.
14. Disconnect wiring plug for condenser fan motor.
(Fig. 33)
15. Remove 4 Phillips head screws that hold fan
cover onto condenser coil. (Fig. 34)
16. Remove cover from fan motor with a 7 mm
socket and a Phillips screw driver or another
7 mm socket (4 bolts holding cover). (Fig. 35)
17. Remove fan blade by unscrewing Phillips head
screw holding blade to fan motor. (Fig. 36)
(NOTE: blade direction and dish direction)
18. Condenser fan motor can be replaced once
condenser fan cover and fan blade are removed.
19. Cut condenser coil from copper lines and follow
all EPA regulations regarding refrigeration.
20. Remove 4 Phillips head screws holding
condenser coil to condensing tray. (Fig. 37 - A)
21. Remove 4 Phillips head screws holding
condenser coil to condensing tray and remove.
(Fig. 37 - B & 38)
22. Installation is reverse of removal.
All EPA, federal and local guidelines need to be followed when working with refrigeration. Follow
all guidelines and safety procedures when working with a flammable refrigerant. All connections
where refrigerant travels must be checked for leaks after connections are brazed in place.
Filter Drier
Condenser Fan Cover
Condenser Fan Blade
Condenser Fan Motor
Condenser Coil
Fig.
35
AA
BB

12
Part Replacement
Evaporator
Compartment Parts
Evaporator Fan Motors
1. Open doors and remove Phillips screws from
brackets holding prep top to base cabinet and
screws along back side of unit. (Fig. 39 & 40)
2. Cut grey silicone sealing prep top to base
cabinet. (Replace with clear silicone during
installation after repairs are made.)
3. Remove shelves from inside the unit and
remove 2 rear shelf clips from the outside
walls. (Fig. 41 & 42)
4. Remove Phillips screws holding evaporator
cover from inside the unit. (Fig. 43)
5. Open lid top and remove pans and dividers.
6. Remove Phillips screws holding inside plates
in place. (Fig. 44)
7. Lift up prep top and move towards front of the
unit and rest top on base. (Fig. 45)
8. Pull inside pan plate towards rear of unit and
then down towards the floor. (Fig. 46 & 47)
Turn off and disconnect
power before servicing
Fig. 39
Fig. 41
Fig. 43
Fig. 45
Fig. 40
Fig. 42
Fig. 44
Fig. 46

13
Part Replacement
Evaporator
Compartment Parts Cont.
9. Rotate inside pan plate and remove from prep
table. (Fig. 48)
10. Pull rear pan plate towards the front of the unit
to disengage it from the prep top. (Fig. 49)
11. Lift prep top off of cabinet base of unit.
12. Lay rear pan plate down inside cabinet to
access evaporator fan motors.
13. Remove Phillips screws from evaporator fan
mounting plate. (Fig. 50)
14. Unplug wiring harness from fan motors.
15. Flip evaporator fan mounting plate over and
remove Phillips screws from evaporator fan
motors. (Fig. 51)
All EPA, federal and local guidelines need to
be followed when working with refrigeration.
Follow all guidelines and safety procedures
when working with a flammable refrigerant.
All connections where refrigerant travels
must be checked for leaks after connections
are brazed in place.
16. Cut copper lines going to evaporator coil
17. Lift evaporator coil out of drain pan
18. Installation is reverse of removal
Evaporator Coil
Fig. 47
Fig. 51
Fig. 49
Fig. 50
Fig. 48

14
Wire Diagram (178APT27HC)

15
Wire Diagram (178APT48HC)

16
Wire Diagram (178APT60HC)

17
Wire Diagram (178APT71HC)

18
Parts Diagram List (178APT27HC)

19
Item # Description Part #
2Door 17817006HC
3Door gasket 178GSKT17313
4Door cartridge 178CARTRIDGE
6Lower right hinge 178HINGSCLBR
7Upper right hinge 178HINGSCLTR
21 Evaporator coil 17812503
25 Evaporator fan motor 17813407
26 Standoff bracket - rear 17818837
28 Controller - temperature 17815350
32 4 " caster with brake 17816412
33 4 " caster, no brake 17819301
37 Condenser coil 17811501
38 Condenser fan motor 17819194
39 Condenser fan blade 17814791
40 Condenser fan cover
42 Filter dryer 970C032S
44 Compressor 17812317
46,47,48 Starting components 17812318
49 Pilaster - 2 hole 178116 62
50 Pilaster - 3 hole 17811663
51 Shelf clip 178CLIP
52 Shelf 178SHELFSC1
53 Rear grill
57 Temperature sensor inside 17813892
58 Thermometer cabinet
Capillary tube 0.031 " ID x 40 " Lg
Parts Diagram List (178APT27HC)

20
Parts Diagram List (178APT48HC)