Merco Savory MHC-22-TDL, Tim Hortons MHC-22-TDL Parts And Service Manual

PARTS AND SERVICE MANUAL

FOR

MERCO HOLDING CABINET

MODEL MHC-22-TDL

HortonsServMan REV: K – 5/9/06

Garland Commercial Ranges

1177 Kamato Road

Mississauga, Ontario L4W 1X4

Canada

Facsimile: [phone]

Telephone: [phone]

SEQUENCE OF OPERATION

SPECIFICATIONS

Model # Voltage Amps Watts Hz.

Net Wt.

lbs./kg

Plug

MHC-22-TDL 120 10.4 1250 60 30/14 Nema 5-15P

TESTING VALUES

TEST VALUE
OHMS on elements 87 Ohms
AMP draw per element 1.3 Amps
OHMS on Temp Probes / Heater Plate 4.2 to 5.0 (depending on room temperature)
TRIAK testing / values 100 – 120 Volts

TOP VIEW

FRONT VIEW

SIDE VIEW

2

WIRING DIAGRAM

3

TROUBLESHOOTING GUIDE

SYMPTOM POSSIBLE CAUSE EVALUATION

Holding Cabinet will
not heat

Incoming Power Supply Verify power cord is secured firmly in receptacle.

Measure the incoming voltage. Check circuit
breakers. Reset if required. Call power company
if needed.

Power Switch Check continuity between switch terminals.

Replace switch as needed.

Unit doesn’t reach
desired temperature

Temperature is too
high

Thermocouple Check for continuity in circuit.

Heat Element Compare cavity temperature with display reading.

Insert temperature probe into center of cavity.
Acceptable temperature variation is +/- 20° from
display reading.
Check for loose connection.
Check the Amp draw on each element for proper
load. Check page 2 for rating information. If the
amp draw is high or low, check the individual
elements for opens, shorts and proper resistance.
WITH POWER OFF: To check resistance of the
elements, remove all leads from the elements and
use a digital multimeter.
The element resistance should be as follows:
120V – 87 ohms
Replace heating element (shelf) as needed.
Check thermostat (common wire). Please note
that if thermostat is bad, both circuits will be bad.

Thermocouple Check for incorrectly wired thermocouple.

Thermocouple wire polarities are reversed.

Heat Element Compare cavity temperature with display reading.

Insert temperature probe into center of cavity.
Acceptable temperature variation is +/- 20° from
display reading.
Check for loose connection.
Check the Amp draw on each element for proper
load. Check page 2 for rating information. If the
amp draw is high or low, check the individual
elements for opens, shorts and proper resistance.
WITH POWER OFF: To check resistance of the
elements, remove all leads from the elements and
use a digital multimeter.
The element resistance should be as follows:
120V – 87 ohms
Replace heating element (shelf) as needed.

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