Airwell AWSI YIFA060–H13 Service Manual page 23


Self -check operation
Press the forced switch at the same time power on, the buzzer sounds twice and enters into self-check operation process
Electric heating motion, indoor fan operates at high speed → operation lamp light for 1s → timing lamp light for 1s →power lamp
light for 1s → indoor fan runs at low speed and medium speed both for 1s
→ compressor motion 1s → four ways valve motion 1s → outdoor motion 1s → buzzer sounds once then close and unit enters into
ready state, ending self-check.
10.2 Control function

Anti-freezing protection
a) The protection is to prevent indoor evaporator from frosting in large area.
b) When indoor coil temperature ≤-2 and lasts for 10s, in addition, the compressor keeps running for 5 min or longer, the
compressor and outdoor fan stops running, indoor fan runs at setting speed.
c) If indoor coil temperature ≥ 7℃, unit quits the protection, once the compressor meets 3 min protection
the unit restart.
d) This function is valid only when cooling or dehumidifying.

Anti-over-heating protection
a) This protection is to avoid wind temperature is too high in heating to cause user feel uncomfortable.
b) When indoor coil temperature TE≥57℃ and lasts for 10s, outdoor unit stops, when indoor coil
temperature TE≥64 ℃ and lasts for 10s, the compressor stops and indoor unit fan speed keep unchanged.
c) When TE< 52℃，unit quits this protection, after the compressor meets 3 min protection, unit returns to normal operation.
d) This function is only valid when heating.

Cooling high pressure protection
a) This protection is to prevent outdoor motor failure which leads to compressor exhaust pressure over using range to cause
compressor damage.
b) When outdoor coil temperature ＞64℃，and lasts for over 20s, the compressor stops running, when
the coil temperature < 52 degree and the 3 min compressor protection is satisfied, the compressor returns to normal running.
c) Once high pressure protection appears 3 times in half an hour, the whole unit stops running and indoor unit alarms high
pressure protection.

Shortage of refrigerant or four valves failure protection
a) This protection is to prevent refrigerant shortage of system and four ways valve failure to turn direction when heating, both of
which lead to cycle liquid be greatly produced which damage the compressor
① Make a record of indoor coil temperature T1 before compressor starts, when the compressor keeps
running for 6 hours, indoor temperature is T2, and if T1-T2＞5℃
②The compressor keeps running for 6 min then room temperature - indoor coil temperature ＜5℃
b) Heating operation: Satisfy the following two conditions and lasts for 10s:
① Make a record of indoor coil temperature T1 before compressor starts, the compressor keeps running (except defrost
operation)for 8 min, indoor coil temperature is T2, if T2-T1 ≤ 8℃
②The compressor keeps running (except defrost operation) for 8 min, if T2-T1 ＜8℃

Exhaust temperature protection
a) This function is to prevent exhaust temperature be too high to reduce the compressor operation longevity
b) When the compressor started, exhaust temperature TP>120℃ and lasts for 3s, exhaust temperature
protection will be activated, the compressor stops, as well as outdoor fan, and alarm outdoor protection. c) When exhaust
temperature falls to 85℃, quits this protection, the failure code will not disappear but
the unit can resume after restart.
Note: This function is available for three phase power supply
CONTROL SYSTEM
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