Midea RSJ-35/300RDN3-B - PCB Explanation

2
nd
Generation ALL IN ONE Type Heat Pump Water Heater Technical Manual
3. PCB explanation
48
2.5 PCB I/O Ports description
Crank Heater
4-way valve
L、N
Transformer
Input
Transformer
Output
Wire Controller
Power Supply
Output
Panel
Display
out
p
ut
Panel Display
Button input
Wire controller
Communication
T4 : Ambient
Temp. Sensor
T3: Evaporator
output Temp.
Senso
r
T5_U: Upper tank
water Temp. senor
T5_L: Lower tank
water Temp. senor
Tp: Comp
discharge Temp.
senor
Th: Comp Suction
Temp. senor
Preserved
Remote On/OFF input from Solar
pre-warming system
low electrical level signal means ON
High electrical level signal means
OFF
Remote On/Off Response
High electrical level signal
means HPWH ON
Low electrical level signal
means HP OFF
High-Pressure
switch
EEV
Fan
SW2 Factory setting
for Auto-restart &
element model
selection
SW3 Factory setting
for Element On/Off