Cooling Operation; Thermostat Control - Panasonic WH-SDC09H3E8 Service Manual

12.1.3 Cooling Operation

12.1.3.1

Thermostat control


Compressor is OFF when Water Outlet Temperature – Internal Water Setting Temperature > -1.5°C for
continuously 3 minutes.

Compressor is ON after waiting for 3 minutes, if the Water Outlet Temperature – Water Inlet Temperature
(temperature at thermostat OFF is triggered) >3°C.
12.1.3.2 Cool Mode Operation
1 3 ways valve control:
3 ways valve switch and fix to cooling side.
o
2 Heat pump operates follow normal cooling operation.
3 Room heater DOES NOT operate during cool mode.
4 2 ways valve control:
2 ways valve is closed.
o
12.1.4 Target Water Temperature Setting
12.1.4.1 Target Water Temperature Control of Standard System (Optional PCB not
connected)
There are 2 types of temperature control selection which are Compensation and Direct.

Temperature control type selection by installer:
1) Compensation : Wlo, WHi, ODLo, ODHi can be set at installer menu.
2) Direct

Remote control setting by user:
1) Compensation : Shift value ±5°C from the compensation curve
2) Direct
*This setting at is only able to set when the room sensor select as Water Temperature.
*Instead of water temperature, user will set target room temperature when room sensor select as Room Thermistor
or Internal Room Thermostat.

Target water temperature is calculated as below condition.
Target water temperature = A (Base temperature) + B (shift temperature)
-
A (Base Temperature)
B (shift temperature) value is depend on the room sensor selection at remote controller as below table:
-
B (Shift Temp.)
Water temperature
External Room Thermostat
Internal Room Thermostat
&
Room Thermistor
: Direct Water Temperature Set
: Direct water temperature set change
Value from the curve + User shift value set
B shift value is depend on the room sensor selection at remocon as table below
B = 0
B = 0
Cool Mode:
B = 0 ; when Zone OFF or Zone Room Thermo OFF
B = 1 * (room set temp. (R/C) – actual room temp.)
Max/Min Regulation of B: (Max: 5°C ; Min: -5°C)
Heat Mode:
B = 0 ; when Zone OFF or Zone Room Thermo OFF
B = follow Heating PI control contents
Compensation
Sensor Selection
98
Direct
Direct value from user setting