Sanyo MDF-U500VX - Normal Mode Operation; Compressor Operation and Protection

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6. Normal mode
a) Compressor operation
ON: Compressor A turns on after 3 minutes (factory default) elapsed time since the power is supplied.
Compressor B turns on after 1 minute after.
Unit also performs this sequence in a cycle operation.
OFF: Compressor A and B turns off simultaneously.
After power failure: Compressor A turns on then Compressor B turns on with specificed delay time.
When a unit reaches to set temp + 0.6㷄, Compressor turns on.
When a unit reached to set temp -0.6㷄, Compressor turns off.
b) Compressor delay time
There is a delay of 3 minutes (Factory default) before the compressor will turn on during cycle operation to
prevent compressor ‘short cycling’.
c) Compressor protection
When both Fan motor A and Fan motor B are locked and condenser temperature is +60㷄 or higher,
compressor will be turned off.
d) Compressor normal control
When comp. sensor temperature on Compressor A or Compressor B is lower than +10㷄, the compressor
returns to normal operation.
Note) Compressor also returns to normal operation when comp. sensor temperature is higher than +60㷄
(comp. sensor is shorted).
Operation sequence of Normal mode
㽲 Compressor A turns on when a unit reaches to set temp + 0.6㷄(“ON” Point in the picture below).
Compressor B turns on with 1 minute of delay.
㽳 Both Compressor A and B turns off simultaneously when unit reaches to set temp – 0.6㷄(“OFF” Point
in the picture below).
ON
Chamber temp.
OFF
Comp 䌁
FAN 䌁
Comp 䌂
FAN 䌂
on
㽲
㽳
o䌮
of
f
of
f
on
o䌮
of
f
of
f
on
on on on
o䌮 o䌮 o䌮
o䌮