Midea RSJ-420/PZN1-H - Page 50

MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual
50
cleaned. By the way, also it will be cleaned when the unit has not any protection in 10 hours.
Otherwise, if switch off the unit by wired controller, the counting of stop frequency will not be
cleaned.
 The latest 3 protections or error code through spot check. Through the spot check button on
PCB board to observe the operating status of unit. Convenient for maintaining by engineering
technicians. Press check button once, it will first display check sequence number (No. and dot),
then on second later display the parameter.
 Normal display contents:
1. Under standby and no error and protection situation, the main unit will display T5, the
slave unit will display the address of this unit.
2. Under the main unit with T5 situation, display T5 temperature; if without T5 or T5 error,
the unit will display error; the slave unit will display the T1 temperature.
 Detail spot check display contents as following:
No.
Display
Specification
1
Water outlet temperature
T1 temperature value
2
Coil temperature
T3 temperature value
3
Ambient temperature
T4 temperature value
4
Water tank temperature
T5 temperature value
5
Refrigerant heating pipe temperature
T6 temperature value
6
Refrigerant heating pipe temperature
T6b temperature value
7
Water inlet temperature
T7 temperature value
8
Discharge temperature
Tp temperature value
9
Suction temperature
Th temperature value
10
Water outlet setting temperature
Ts temperature value
11
Operating temperature of circulating
heating water
Tr temperature value
12
Compressor A current
IA current valve
13
Compressor B current
IB current valve (this unit display --)
14
EXV opening
EXV opening
15
Warm water valve opening
Warm water valve opening