Service Manual User Manual

12
(T1-Ts)℉
2
-2
Operation conditon for
heater or compressor
Heater(compressor) off
Heater(compressor) on
6.5.2.1 The Electric heater operates as below:
a. When T1﹤Ts-2℉, the fan motor operates, and 3 seconds later, the heater is on and
operates at low speed within 30 seconds. After 30 seconds, it will change to the setting
speed. If the DAHT temperature checked is higher than the protection temperature, when the
heater operating, the fan motor will be off automatically.
b. When T1≥Ts+2℉, the heater is off, and the fan motor keeps on working at setting speed. If
the DAHT temperature checked is low than the protection temperature, and the operation
time of fan motor is more than 15 seconds, then the fan motor will be off. If the T2 protection
gets started, the fan motor also does not work.
6.5.2.2 The Heat pump operates as below:
The Heat pump′s operation mode is in accordance with the way of compressor′s working.
The compressor is on (electric heater is off), the fan motor operates according to the anti-cold
wind of heat pump. The four-way valve always keeps on. When T1﹤Ts-2℉, the compressor is
on, and when T1≥Ts+2℉,it will be off. The fan motor works according to the operation of
compressor. If T2﹥TE7, the compressor is off by force. When the DAHT protection gets started,
it is not allowed that the compressor operates.
 6.6 Sensor malfunction
LED display
Stand for
AS
Room temperature sensor error(T1)
Es
Room temperature sensor error(T2)
CS
Condenser temperature sensor error(T3)
OS
Outside temperature sensor error(T4)
HS
Exhaust temperature sensor error(T5,T6)