External Room Thermostat Control (Optional) - Panasonic WH-MXC09J3E5 Service Manual

Control Content
Indoor will follow the SG ready bit input to control ON/OFF heat pump and boiler
00 : Heat pump OFF, Boiler OFF
01 : Heat pump ON, Boiler OFF
* External pump will turn ON when the external pump selection is ON when boiler is ON even heat pump is OFF.
Boiler prohibit flag control
Purpose:
For product safety. Boiler signal is OFF when water temperature is too high.
o
Start condition:
Water outlet ≥ 85°C continues for 5 minutes.
o
Water inlet ≥ 85°C continues for 5 minutes.
o
Zone1 water temp ≥ 85°C continues for 5 minutes.
o
Zone2 Water temp ≥ 85°C continues for 5 minutes.
o
Contents:
 After start condition fulfilled, set boiler prohibit flag = 1
Cancel condition:
After 30 minutes from start condition fulfilled.
o
Contents:
 Set boiler prohibit flag = 0

14.22 External Room Thermostat Control (Optional)

Purpose:
1 Better room temperature control to fulfill different temperature request by external room thermostat.
Recommended external room thermostat:
Connection of external room thermostat:
Wire Connection and thermo characteristic of Siemen REV200:
Setting
Set Temp < Actual Temp
Set Temp > Actual Temp
Indoor Unit
9 : Terminal Bord No.
Maker
Siemen (REV200)
Siemen (RAA20)
L/L1 (H)
Open Circuit
Short Circuit
9
10
Cooling 11
Heating
12
Connect only heating line for heating only model. And connect both
heating and cooling line for heat + cool model.
10 : Heat pump OFF, Boiler ON
11 : Heat pump ON, Boiler ON
Characteristic
Touch panel
Analog
Heat Thermo
OFF
ON
135
L/L2 (C) Cool Thermo
Short Circuit
Open Circuit
L (label)
Siemen REV200
L1 (label)
L2 (label)
ON
OFF