160
Cooling
Heating
Siemen REV200
Indoor Unit
L
N
C
H
L (label)
L1 (label)
L2 (label)
9 : Terminal Board No.
Connect only heating line for heating only model. And connect both
heating and cooling line for heat + cool model.
Wire Connection and thermo characteristic of Siemen RAA20:
Setting L/Y1 (H) Heat Thermo L/Y2 (C) Cool Thermo
Set Temp < Actual Temp Open Circuit OFF Short Circuit ON
Set Temp > Actual Temp Short Circuit ON Open Circuit OFF
Cooling
Heating
Siemen RAA20
Indoor Unit
L
N
C
H
L (label)
Y1 (label)
Y2 (label)
9 : Terminal Board 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:
o During 3 ways valve switch Off time, the hot water will provide heat capacity to heating side.
2 3 ways valve switch On:
o During 3 ways valve switch On time, the hot water will provide heat capacity to tank side.
3 Stop condition:
o During stop mode, 3 ways valve will be in switch off position.
4 When deice flag received from outdoor
o During Heat mode, 3 ways valve maintain at room side.
o During Tank mode, 3 ways valve switch ON to tank side regardless of tank thermo conditions.
o During Heat + Tank mode, 3 ways valve direction is as below
a) When receive deice bit from outdoor, if 3 ways valve is ON to tank side, maintain at tank side.
b) When receive deice bit from outdoor, if 3 ways valve is OFF at room side, maintain at room side
when any of below condition achieved :-
i) Tank temperature < [ 40°C ]
ii) Remote controller ‘DHW Defrost’ select ‘NO’
Else, switch ON to Tank side.
* Resume back to room interval after deice operation complete.
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