Trouble Shooting; Protective Function; 3-Minute Delay For The Compressor Start-Up; Compressor Current Overload Protection - York YKHC 18 Service Manual

5. Trouble Shooting

5.1 Protective Function

5.1.1 3-minute delay for the compressor start-up.

At the beginning of energizing or after the stop of the compressor, 3-minute delay will be needed to start the
compressor.
When switchover between cooling/heating mode, the compressor stops automatically.

5.1.2 Compressor current overload protection

5.1.2.1 3HP compressor current examination and action
current
I3
I2
I1
Remark :Ie: rating current; I
a. The compressor and outdoor fan closed for protection purpose will restart after 3 minutes.
b. During the protection, the indoor fan continues working in a set speed, while the anti-cold air function
when heating and the compressor will be 3 minutes delayed to shut down for protection.
c. When there are 4 times compressor protection within one hour, the A/C will be shut down, meanwhile
the operation light and timer light will be turned on, the defrosting light flashes in a frequency of 0.5Hz.
This situation will be recovered only when power is switched off.
5.1.2.2 If the AC don"t check the compressor current through electric control system, then use compressor self
current protection.
5.1.2.2 4HP(3N), 5HP compressor current is checked by outdoor main board. The protection principle is as
following:
In any case, after the compressor starts, if
a. Only in heating mode, when current is higher than 1.5Ie, then outdoor fan will shut off. When compressor
current is less than 1.3Ie, then restart outdoor fan and recover operation.
b. when current is higher than 1.5Ie and time is up to 20seconds, compressor and outdoor fan will shut down. At
the same time, cut down outdoor protection communication wiring, protection malfunction will be indicated by
indoor unit and 3minutes later restart compressor.
3 seconds later, the compressor / outdoor fan close down
5 minutes later, the compressor / outdoor fan close down
Recover
:1.3 time Ie; I :1.5 time Ie; I
1 2
restart the outdoor fan
(works only when heating)
:2.0 time Ie.
3
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