AIR COOLED SCROLL CHILLER CONTROL
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valve is still energized. If the unit is turned off by operating the displayer, the 4-way valve
will be de-energized after the compressor is off for 2min.
（4）Defrosting control
Auto defrosting staring conditions (3 conditions must be met simultaneously)
a. Accumulative running time of compressor exceeds interval between the defrosting times.
b.The temperature detected by the defrosting sensor reaches defrosting start condition
c.Accumulative running time of compressor reaches 4min and 50s.
If the above 3 conditions are met simultaneously, the dual systems defrost at the same time.
d. Defrosting temperature reaches end condition. The following detailed conditions are met:
e.Defrosting time reaches setting time.
Dual-fan system
If defrosting temperature of one system (a) reaches end condition, operate according to the
following two conditions:
1）If system (b) has not reached end temperature, system (a) will be off to wait untill system
(b) reaches end condition. After that, they enter into heating operation together.
2）If system (b) also reaches end condition, both of the systems end defrosting and enter into
heating operation.
Under conditions 1) and 2), 4-way valve after defrosting to heating will firstly open and the
fan will be on after 5s.If compressor is originally on, it also keeps this state. If is originally
off, it will restart after 3-min stop at least.
4-fan system
If a certain system met the end condition, the fan will be on and then stop after 10s. After 8-s
stop of fan, if end temperature is detected again, the system directly enters into heating
operation.
（5）Auxiliary heating control
If auxiliary heating function is on by operation of displayer, the unit will control the auxiliary
electric heater on/off according to inlet water temperature.(First startup of the unit, auxiliary
electric heater will start after 15min of the unit)
If Tin ≤T1 detected by the inlet water temp. sensor, the second group of E-heater (auxiliary
electric heater) run.
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