TCL Air Conditioner Service Manual
13
6). In the process of unit operation, once the compressor ceased, it should be 3 min delay for the next procedure.
3. IDU time delay: When compressor stops or unit switches off while in heating mode, IDU fan motor will work for a
few seconds more to prevent overheat.
4: ODU Fan motor control:
1). While unit:
a. To be switched off
b. Under protection.
c. To the set temperature
After compressor ceased, the fan motor stops working according to the temperature of OPT and OAT, the max delay
for the motor should be less than 160s.
2). When switch on unit on heating mode, ODU fan motor will delay 5s after compressor starts up
3). in the process of defrosting, the fan motor will stop operation 48s delay after compressor stopped.
4). defrosting finish, the compressor stops operation, the fan motor will start working simultaneously.
5. 4-way valve control
1). On Cooling/Dry/Fan mode,4-way valve: OFF, when unit switched on heating mode,4-way valve: ON.
2). When heating mode switched off, or changed from heating to other modes, the 4-way valve will be OFF 2 min
delay after the compressor stops working.
3). Unit stops working caused by any kind of protection, the 4-way valve will be OFF 4 min delay.
4). In the process of defrosting, 4-way valve will be OFF 43s delay after compressor stopped.
5). When defrosting finish, the compressor stops operation, 4-way valve will be ON after 43s delay.
0 ℃
-1℃
-2℃
-3℃
ST-CRT
COMPRESSOR
OUTDOOR FAN
INDOOR FAN
2 min.
10 min.
5min.
≥ 7min.
160S
160S
≥3min.
4-way VALVE
5s
ON
OFF
0.5℃
≤2min.
≤2min.
6. Defrost
Note: t1: compressor continuous works time.
t2: AC unit operation first time going to defrost circle.
t3: compressor accumulated working time (when OPT≤3℃ unit starts to count the time for t3).
When AC unit working to:
t1≥t2, or
t3≤t1＜t2.
and also the temperature (related to OAT & OPT) tested 3 min continuously meets for defrosting.
Defrosting start up: Compressor stops working, and re-starts to working after 50s delay;
Conditionsforquittingdefrosting
After defrosting 60s, and OAT≥12℃; or
OAT＜－5℃, and OPT ≥8℃ for 80s continuously; or
The defrosting for 10 min.
When AC meet any of condition a, b or c, defrosting finish.
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