Service Manual

10
II. Sequence of Operation and Service Diagnosis
A. Sequence Flow Chart
1. Cooler ER1A-FS, ER2A-FS
Cycle Steps
Slight
Delay at
3.
Startup/Cool Down 2. Cool Down Achieved
3. Cool Down Restart
4. Defrost
putratS
Factory default
CTh warms to 6°F (-14°C) above
setpoint
Power On
CTh in control
3-min. Comp on timer starts
33°F (0.5°C)
3-min. Comp off
timer starts
EvapFM energized Comp energized
ConFM energized EvapFM energized
EvapFM de-energized Comp de-energized
ConFM de-energized
EvapFM energized Comp de-energized
ConFM de-energized
Comp energized ConFM energized EvapFM energized
Note:
k)
EvapFM de-energizes when door is opened on.
l)
3-min. minimum Comp on timer starts when Comp energizes.
m)
3-min. minimum Comp off timer starts when Comp de-energizes.
n)
25-min. maximum defrost time.
o)
Temperature displayed is frozen during defrost.
Legend:
Comp-compressor
ConFM-condenser fan motor CTh-cabinet thermistor EvapFM-evaporator fan motor
25-min. maximum defrost
4 hrs Interval between defrosts
5. Defrost Termination
Defrost termination only by maximum time programmed
(
25 min.
)