MCAC-RTSM-2013-12
Midea High-temperature Direct-heating Heat Pump Water Heater Technical Manual
46
7.
Main control board spot check
Sequence
System operation parameters
Remarks
1st
Normal display Water out temperature
Value of T1
2nd
Pipe temperature
Value of T3
3rd
Ambient temperature
Value of T4
4th
Water tank temperature
Value of T5 (Just for main unit)
5th
Electric heating tube temperature
Value of T6
6th
Compressor discharge temperature
Value of Tp
7th
Setting water temperature
Value of Ts
8th
Circulate heat starting temperature
Value of Tr
9th
Current of compressor A
Value of IA
10th
Current of compressor B
Value of IB
11th
Opening of electric expansion valve
Value of electric expansion valve opening / 8
12th
Opening of electric water flow valve
Value of electric water flow valve opening / 32
13th
Operate mode
0: Stand by 1: Direct heating mode 2:Circulate
heating mode
14th
Fan speed
0: OFF 1: Low 2:Middle 3:High
15th
Elevation of water surface
0:Lower than S4 1: Between S4 and S3
2:Between S3 and S2 3:Between S2 and S1
4:Higher than S1
16th
The last error code or protection code
Display the latest error code or protection code.
If there is no code, display
“--”
8.
Failure without Code
Failure description
Cause analysis
Solution
The leakage switch is
switched off, which resulted
in the impossible of
switching in.
The input of the leakage switch is not equal to
the output.
1. Check whether the neutral line is connected
through the output end of leakage switch. The
neutral line is not allowed to couple in the unit
bypassing the leakage switch.
Connect the neutral line out from the
output end of the leakage switch.
2. The live line and neutral line in the same
power use equipment are coupled in different
output end of the leakage switch.
2. Connect the live line and neutral line in
the same power use equipment out from
the same output end of leakage switch.
Wire controller screen is
kept on initializing, and the
display of the water level
changes between the zero
grade and the fourth grade
continually.
1. Both the main unit and the slave unit of the A
and B power lines of wire controller are connected
1. Dismantle the A and B power lines of
the slave unit.
2. The address codes of the main unit and the
slave unit are set improperly (or no adjustment
is carried out, each unit is set to 0 before
delivering, and the default is the main unit).
2. The S1 on the panel of the main unit is
set to 0, and the DIP switches on the
panel of the slave units are set to 1, 2,
3…
