Three Ways Valve Control - Panasonic WH-MXC09J3E5 Service Manual

Wire Connection and thermo characteristic of Siemen RAA20:
Setting
Set Temp < Actual Temp
Set Temp > Actual Temp
Indoor Unit
9 : Terminal Bord No.
Connect only heating line for heating only model. And connect both
heating and cooling line for heat + cool model.
Control Content:

External room thermostat control activate only when remote thermostat connection select YES by Indoor control
panel.

When indoor running heat mode, refer thermo On/Off from heating line feedback. And when indoor running cool
mode, refer thermo On/Off from cooling line feedback.

Heat pump Off immediately when receive thermo off feedback.

14.23 Three Ways Valve Control

Purpose:
- 3 ways valve is used to change flow direction of hot water from heat pump between heating side and tank side.
Control contents:
1 3 ways valve switch Off:
During 3 ways valve switch Off time, the hot water will provide heat capacity to heating side.
o
2 3 ways valve switch On:
During 3 ways valve switch On time, the hot water will provide heat capacity to tank side.
o
3 Stop condition:
During stop mode, 3 ways valve will be in switch off position.
o
Indoor Unit
AC230V
* During pump down and force mode, fix 3 ways valve in close condition.
* Recommended Parts : SFA 21/18 (Siemens)
L/Y1 (H)
Open Circuit
Short Circuit
9
10
Cooling 11
Heating
12
Spring Return 2 point
NC
L
L
N1
N1
N2
N2
NO
L
N1
N2
Heat Thermo
OFF
ON Open Circuit
M
M
136
L/Y2 (C) Cool Thermo
Short Circuit
L (label)
Siemen RAA20
Y1 (label)
Y2 (label)
SPDT 3 wire
COM
L
M
Open
N1
Close
N2
ON
OFF