Frymaster UHC-P User manual

Frymaster, a member of the Commercial Food Equipment Service Association, recommends
using CFESA Certified Technicians.
*8196044* 24-Hour Service Hotline
1-800-551-8633
Price: $6.00
819-6044
FEB 13
UHC-P /HCP
Service, Parts Manual for 4, 2-Slot and Narrow Models

NOTICE
IF, DURING THE WARRANTY PERIOD, THE CUSTOMER USES A PART FOR THIS ENODIS
EQUIPMENT OTHER THAN AN UNMODIFIED NEW OR RECYCLED PART PURCHASED DIRECTLY
FROM FRYMASTER DEAN, OR ANY OF ITS AUTHORIZED SERVICE CENTERS, AND/OR THE
PART BEING USED IS MODIFIED FROM ITS ORIGINAL CONFIGURATION, THIS WARRANTY WILL
BE VOID. FURTHER, FRYMASTER DEAN AND ITS AFFILIATES WILL NOT BE LIABLE FOR ANY
CLAIMS, DAMAGES OR EXPENSES INCURRED BY THE CUSTOMER WHICH ARISE DIRECTLY
OR INDIRECTLY, IN WHOLE OR IN PART, DUE TO THE INSTALLATION OF ANY MODIFIED PART
AND/OR PART RECEIVED FROM AN UNAUTHORIZED SERVICE CENTER.
THE CABINET IS NOT SUITABLE FOR OUTDOOR USE. WHEN OPERATING THIS UNIT, IT
MUST BE PLACED ON A HORIZONTAL SURFACE.
THE CABINET IS NOT SUITABLE FOR INSTALLATION IN AN AREA WHERE A WATER JET
CAN BE USED. THIS APPLIANCE MUST NOT BE CLEANED WITH A WATER JET.
FOR YOUR SAFETY
DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND LIQUIDS IN
THE VICINITY OF THIS OR ANY OTHER APPLIANCE.
DO NOT OPERATE OR SERVICE THE CABINET WITHOUT FIRST READING THIS MANUAL.
DO NOT OPERATE THE CABINET UNLESS IT HAS BEEN PROPERLY INSTALLED AND
CHECKED.
DO NOT OPERATE THE CABINET UNLESS ALL SERVICE AND ACCESS PANELS ARE IN
PLACE AND PROPERLY SECURED.
DO NOT ATTEMPT TO REPAIR OR REPLACE ANY COMPONENT OF THE CABINET UNLESS
ALL POWER TO THE UNIT HAS BEEN DISCONNECTED.
USE CAUTION WHEN SETTING UP, OPERATING, OR CLEANING THE CABINET TO AVOID
CONTACT WITH HEATED SURFACES.

Table of Contents
Theory of Operation 1-1
Service Procedures 2-1
Re-addressing Cabinet 3-1
Troubleshooting 4-1
Illustrated Parts List 5-1
Wiring Diagrams 6-1

Cabinet Service Procedures
1-1
1 Functional Description
1.2 Theory of Operation
The CABINET operates on 208-250VAC 50 or 60 cycle single-phase power. The main switch
activates a relay, which supplies line voltage to two distribution boards, two cooling fans and a 12-
volt transformer, which supplies a power supply. The power supply provides 5VDC to the
communication board and the distribution boards.
A ribbon cable connects the communication board to both distribution boards, connecting at J9.
Ribbon cables, which carry 5V DC, also connect the distribution boards to the displays. The
resistance of RTDs attached to the heater plates is monitored by the distribution boards. The board
switches power through solid-state relays to the heater plates when the resistance, which is used as
an indicator of temperature, falls out of the range for the product held in the cabinet.
The switch, transformer, communication board, cooling fans and power supply are mounted under
the top of the unit. There is a small dark lens portal on the upper right side of the cabinet, which
allows infrared communication between the cabinet and a Palm Pilot. The distribution boards are
mounted on the left side (as viewed from the front).
The parameters for holding temperatures are transferred to the cabinet’s communication board via a
Palm Pilot with special CABINET software. All programming of the cabinet is done on the Palm.
Figure 1: UHC-P cabinet
IR port
Timer key
Menu key
Temperature
Key
LEDs
Power switch
Timer keys
Note: The illustrations
for these service
procedures are of the 4-
slot full size UHC-P. The
procedures are similar
for the 2-slot and the
narrow models.
NOTE: This manual covers the UHC-P, the original
PDA-programmed cabinet for McDonald’s and the HCP
or Holdmaster, a similar cabinet made for the general
market. UHC-P parts are compatible with the HCP,
except for the heater plates and bezel.

Cabinet Service Procedures
1-2
1.3 Start Up Indicators and Test Points
Upon startup, the communication board beeps. On the
distribution boards, an LED flashes rapidly for a few
seconds and then slows to one flash every two seconds.
The displays will show the version number of the
cabinet’s firmware and then the slot’s status.
LED

Cabinet Service Procedures
2-1
2 Service Procedures
DANGER: Failure to disconnect the power supply before servicing could result in serious
injury or death. The cabinet power switch DOES NOT disconnect all incoming power to the
cabinet.
2.1 Accessing the Electronic Components
1. The component shelf is accessed by removing two
screws on each side of the unit. See figure 1.
2. Lift and remove the sides, which exposes screws
that hold the top in place. See figure 2.
3. The front panel, which holds the switch and the IR
lens, can be rotated forward by removing a screw on
either side and loosening two others. See figure 3.
With the removal of four more screws, the
component shelf will slid forward if necessary.
Figure 1: The side panels must be removed to
access the component shelf.
The side panels are
secured with two
screws at the base.
Figure 2: Four sheet metal tabs hold the top in place.
Remove these screws at each corner and lift off the
top.
Tab and screw
securing top
Remove the
bottom screw
and loosen
the top one to
tilt out the
front panel.
Figure 3: Remove the screws which secure the
component shelf, allowing the shelf to be pulled
forward.
The top is held
in place by
screws behind
the side panel.

Cabinet Service Procedures
2-2
Under the top
Figure 4
Com board
Rela
y
Transformer
Power
supply
Fuses
Fans

Cabinet Service Procedures
2-3
All the components are readily removed. There are no replaceable components on the circuit boards.
The replacement of a display, distribution or communication board will require re-addressing the
cabinet, covered in Section 3.
2.2 Tests
2.2.1 Transformer
1. Disconnect power to cabinet. Remove side and top panels, unless stacked. See the service
procedures for access instructions, Section 2.1
2. Check for 208VAC at the primary, 12VAC at the secondary terminals.
2.2.2 Power Supply
1. Disconnect power and check all terminals and
connections for loose or disconnected wires.
2. Apply power and check for +5VDC at the J5 terminal
on the communications board, using the center pin for
the positive lead and either adjacent for the negative
lead.
2.2.3 RTD
1. Remove the leads from the suspect RTD and test for
resistance. selected temperatures and resistances are
show in Figure 7, a chart at right.
NOTE: After testing, reconnect all leads to their
original positions.
Sensor
(°F) Resistance Sensor
(°C)
60 106.065 15.55
70 108.224 21.11
80 110.380 26.66
90 112.532 32.22
100 114.680 37.77
110 116.825 43.33
120 118.966 48.88
130 121.104 54.44
140 123.239 60.00
150 125.369 65.55
160 127.496 71.11
170 129.620 76.66
180 131.740 82.22
190 133.856 87.77
200 135.969 93.33
210 138.078 98.88
220 140.184 104.44
230 142.286 110.00
240 144.385 115.55
250 146.480 121.11
260 148.570 126.66
Figure 7: RTD resistance chart

Cabinet Service Procedures
2-4
2.2.4 Distribution Boards
1. Check for line voltage
between the heater
plate terminal on the
board and the terminal
block for the suspect
heater. Note: Line
voltage is only seen
when the slot is calling
for heat.
2. Check for line voltage
between the power
input terminal and the
terminal block.
3. Check for +5VDC at
the Power In terminal
between the positive
center pin and either
adjacent pin.
NOTE: After testing,
reconnect all
connections to their
original positions.
2.2.5 Display
1. Connect the ribbon cable from a faulty display to the connector of a properly working display to
isolate the problem to the display or the distribution board.
2.2.6 Shorted Triac
1. Turn the suspect slot off and measure voltage between the suspect heater lead on the distribution
board and the terminal block With the slot off, there should be no line voltage. If the triac is
shorted, you will measure AC line voltage. If the triac is half waving, you will get DC voltage of
approximately one-half the line AC voltage.
2.2.7 Calibration
Calibrate the top and bottom plates in all four UHC slots by performing the following procedure
with the slots clean, empty and at operating temperature for at least 30 minutes.
1. Press the temperature key to ensure the slot is at setpoint.
2. Slide the Atkins sensor into a slot with the sensor facing up to measure the top heater plate or
down to measure the bottom heater plate. Move the sensor to the center of the plate. To get an
accurate reading, the sensor must be within ±1 inch (25mm) of the center of the plate.
Figure 8: Testing distribution board.
Line voltage between
slot leads and
common on terminal
block with slot calling
for heat.
Line Voltage between
power input and
common on terminal
block.
+ 5VDC between
positive center pin
and either
adjacent pin.

Cabinet Service Procedures
2-5
3. Allow three minutes for the sensor to stabilize.
4. Read the temperature on the Atkins meter and compare to the reading from the cabinet, which is
displayed by pressing the temperature key once for the top plate temperature and twice for the
bottom plate. The displayed temperature should be within ±5°F (±3°C) of the meter. If the
reading is out of tolerance, perform the following procedure.
Launch the UHC-P software on the Palm and follow these steps:
Step 1: Tap the left corner
of the display in Setup or
Menu mode. A menu bar is
dis
p
la
y
ed.
Figure 2: Tap View in the
menu bar and tap Cabinet
in the pull-down menu.
Step 3: The Cabinet
Configuration menu is
displayed. Tap the
Offsets button in the left
corner.
Step 4: The Cabinet
Configuration Offset menu
is displayed. The offset
entry fields for the slots are
arranged left to right and
top to bottom
Step 5: Tap on the number
line by the plate being offset
and then the number in the
bottom right of the Palm
display. Use the backspace
key to erase number in the
field and use the keypad to
enter the desired offset.
See examples in Table 1 (at
right). Tap Done.
Offset Entry
Examples
Display Meter Correction
150°F 155°F 5
150°F 145°F -5
66°C 69°C 3
66°C 63°C -3
Table 1