Henny Penny CF-941 User manual

TECHNICAL MANUAL
Henny Penny
Multipurpose Holding Cabinet
Model CF-941

Model CF-941
TABLE OF CONTENTS
Section Page
Section 1. MAINTENANCE ............................................................................................................1-1
1-1. Introduction ...........................................................................................................1-1
1-2. Safety ....................................................................................................................1-1
1-3. Test Instruments ....................................................................................................1-2
1-4. Error Codes............................................................................................................1-2
1-5. Control Board........................................................................................................1-3
1-6. Power Switch ........................................................................................................1-3
1-7. Transformer...........................................................................................................1-4
1-8. Relays ....................................................................................................................1-5
1-9. Heating Elements ..................................................................................................1-6
1-10. Temperature Probe ................................................................................................1-7
1-11. Drawer Gasket.......................................................................................................1-8
1-12. High Limit .............................................................................................................1-9
1-13. Wiring Diagram................................................................................................... 1-10
Section 2. PARTS INFORMATION ................................................................................................2-1
2-1. Introduction ...........................................................................................................2-1
2-2. Genuine Parts ........................................................................................................2-1
2-3. How To Order Parts ..............................................................................................2-1
2-4. Prices .....................................................................................................................2-1
2-5. Delivery.................................................................................................................2-1
2-6. Warranty................................................................................................................2-1
2-7. Recommended Spare Parts for Distributors..........................................................2-1
206 FM06-013 i
Revised 02-10-06

Model CF-941
SECTION 1. MAINTENANCE
1-1. INTRODUCTION This section provides procedures for checking and
replacement of the various parts used within the cabinet.
1-2. SAFETY Where information is of particular importance or is safety
related, the words NOTICE, CAUTION, or WARNING
are used. Their usage is described below:
SAFETY ALERT SYMBOL is used with DANGER,
WARNING, or CAUTION which indicates a personal
injury type hazard.
NOTICE is used to highlight especially important
information.
CAUTION used without the safety alert symbol
indicates a potentially hazardous situation
which, if not avoided, may result in property damage.
CAUTION used with the safety alert symbol
indicates a potentially hazardous situation which, if
not avoided, may result in minor or moderate injury.
WARNING indicates a potentially hazardous
situation which, if not avoided, could result in
death or serious injury.
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Model CF-941
1-3. TEST INSTRUMENTS You may use two test instruments to check the electrical
components.
1. A continuity light.
2. An ohmmeter.
When the manual refers to the circuit being closed, the
continuity light will be illuminated or the ohmmeter
should read zero unless otherwise noted. When the
manual refers to the circuit being open, the continuity
will not illuminate or the ohmmeter will read one or
infinite resistance.
An ohmmeter must be used to check coils.
1-4. ERROR CODES
DISPLAY CAUSE PANEL BOARD CORRECTION
“E-4” Control board Turn switch to OFF position, then turn switch back to
overheating ON; if display shows “E-4”, the control board is
getting too hot; make sure unit is not overheating
“E-6” Faulty temperature Check to see if unit is set to the correct number of
probe drawers, ex: “MP-942=2” drawers (see Operation
and Programming Section in Operator’s Manual)
“E-41” Memory scrambled Press and release the UP and DOWN buttons to
initialize the program; if “E-41” persists, replace the
control board
“Hi” Unit over-heating; Have relay or control board replaced
faulty relay or
control board
1-2 203

Model CF-941
1-5. CONTROL BOARD 1. Disconnect the electrical supply to the cabinet.
To avoid electrical shock or property damage,
move the POWER switch to OFF and disconnect
main circuit breaker, or unplug cord at wall
receptacle.
2. Remove the two screws on the front of the control
panel and pull control drawer out.
3. Using a 5/16" socket, remove nuts securing the board
and remove board from the panel.
4. Remove the wires from the control board.
Step 3 5. Install new control board in reverse order.
Do notover-tighten nuts securing the control board,
or the buttons on the controls may not function.
1-6. POWER SWITCH 1. Disconnect the electrical supply to the cabinet.
To avoid electrical shock or property damage,
move the POWER switch to OFF and disconnect
main circuit breaker, or unplug cord at wall
receptacle.
2. Remove the two screws on the front of the control
panel and pull control drawer out.
Mark the wires when removing them from the switch
to be sure the switch is rewired correctly.
3. Remove the wires from the switch. Check for
continuity across the top and bottom terminals, on
both left and right side of the switch. With the switch
in the ON position, the circuit should be closed.
Step 3 With the switch in the OFF position, the circuit
should be open. If the switch is defective, replace it
by continuing with this section.
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Model CF-941
1-6. POWER SWITCH (Continued)
4. Squeeze the tabs on the back of the switch and pull
the switch out from the front of the panel.
5. Install new switch in reverse order.
Step 4
1-7. TRANSFORMER 1. Disconnect the electrical supply to the cabinet.
To avoid electrical shock or property damage,
move the POWER switch to OFF and disconnect
main circuit breaker, or unplug cord at wall
receptacle.
2. Remove the two screws on the front of the control
panel and pull control drawer out.
Step 3
3. Label wires and remove them from the transformer.
4. Using a Phillips head screwdriver, remove the two
screws securing the transformer and remove the
transformer.
5. Install the new transformer in reverse order.
Step 5
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Model CF-941
1-8. RELAYS 1. Disconnect the electrical supply to the cabinet.
To avoid electrical shock or property damage,
move the POWER switch to OFF and disconnect
main circuit breaker, or unplug cord at wall
receptacle.
2. Remove the two screws on the front of the control
panel and pull control panel out.
Checkout:
3. With no power going to the relay, 120 volts should
show on the output side of the relay, and 0 volts on
the input.
To avoid electrical shock, make connections before
applying power, take reading, and remove power
before removing meter leads. The following
checks are performed with the wall circuit breaker
closed and the POWER switch in the ON position.
4. With the component energized, 0 volts should show
on the output side of the relay, and 5 volts on the
input side.
5. If voltage varies from steps 3 and 4, remove power to
unit, pull input wires from relay and place leads of
meter onto input wires. Reapply power to unit.
When unit is running, the input wires to relay should
show 5 vdc. If this proves true, the relay is faulty.
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Model CF-941
1-8. RELAYS (Continued) Replacement:
6. Remove power supplied to unit.
7. Label and remove wires from the appropriate relay.
8. Using a Phillips head screwdriver, remove the screws
securing the relay and remove the relay from the unit.
9. Coat the back of the relay with the thermal joint
compound and install new relay.
Step 8 Failure to use the thermal joint compound will
shorten the life of the relay.
10. Replace control panel and unit is now ready for use.
1-9. HEATING ELEMENTS 1. Disconnect the electrical supply to the cabinet.
To avoid electrical shock or property damage,
move the POWER switch to OFF and disconnect
main circuit breaker, or unplug cord at wall
receptacle.
2. Remove the drawer from the liner.
3. Using a 3/8" socket, remove the 4 acorn nuts securing
the front of the bracket.
4. Using a Phillips head screwdriver, remove the ten
screws securing the bracket and remove the bracket.
Step 4
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