Service Manual

10
II. Sequence of Operation and Service Diagnosis
The steps in the sequence are as outlined below.
See the table for default cabinet temperature control settings.
Model Default Cabinet Temperature
Control Setting
Approximate Default Temperature
Undercounter
Worktop
Between 4 and 5 Refrigerator: 34°F (1°C)
Freezer: -5°F (-21°C)
Prep Table Between 4 and 5 34°F (1°C)
A. Sequence of Operation Flow Chart
1. Undercounter and Work Top: Refrigerator
1. Startup/Cool Down
2. Cool Down Achieved
Comp energized
ConFM energized
EvapFM energized
Comp de-energized
ConFM de-energized
EvapFM de-energized
CTh in control
Off cycle defrost
between run cycles
Refrigerator Sequence Flow Chart
2-min. Comp
on timer starts
2-min. Comp
off timer starts
Legend:
Comp-compressor
ConFM-condenser fan motor
CTh-cabinet thermistor
EvapFM-evaporator fan motor
Power on
Red LED On
(5 sec. Delay)
Green LED Flashes
If Red LED ashes, check CTh
Green LED Flashes
If Red LED ashes, check CTh
CTh above setpoint
CTh cools to setpoint
CTh above setpoint
Note: Delays
a) 2-min. minimum Comp on timer starts when Comp energizes.
b) 2-min. minimum Comp off timer starts when Comp de-energizes.
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