Promatic WDC Series, Manual

Page: 55 / 176

Service setting manual 55
ENG
PUMP FOR ADDITIONAL MIXING IN THE BOILER (bypass pump)
Circulation pump output (R6 or R7) can be used to control the bypass pump to increase
boiler return temperature. You can set this operation mode by setting the parameter S1.4=11
(boiler return pipe sensor) and S4.9=4 (bypass pump). Install the T1 sensor in the boiler re-
turn-pipe between boiler and mixing valve. If return-pipe temperature drops below the tem-
perature set by parameter S5.14, the pump is switched on.
DOMESTIC HOT WATER
D. h. w. warming with liquid fuel boiler
With the parameter P4.1 you can set the required d. h. w. temperature for the inactive time
program interval.
If the boiler temperature exceeds the maximum allowed boiler temperature - parameter
S5.1 d. h. w will be warmed up to the maximum temperature set with parameter S4.3.
When d. h. w. is warmed, the pump is switched off with delay. The delay time is set with pa-
rameter S4.12.
D. h. w. warming with solid fuel boiler
When a solid fuel boiler is in operation, the d. h. w. is warmed to the required d. h. w. tem-
perature (set with parameter S4.10) independent of the time program.
In case the solid fuel boiler temperature exceeds the maximum boiler temperature - parame-
ter S5.13, then for the required d. h. w. temperature, the maximum allowed d. h. w.
temperature is set with parameter S4.3.
D. h. w. warming with a heater with integrated heat pump
In this case, a special operation mode of d. h. w. control is activated by setting the parame-
ter. S1.4=10 (for sensor T1) or S1.5=11 (for sensor T8). Install a room sensor in the room,
where the heat pump is located, and connect it to the T1 terminal (1, GND) or T8 terminal (8,
GND). The controller will block the d. h. w. warming function from the central heating boiler
for the time the heat pump room is warmer as set with parameter S4.11.
D. h. w. warming with solar collectors
The basic operation of the solar collectors system is determined by switch-on differences,
switch-off differences and minimum temperatures of solar collectors - parameters P6.1, P6.2
and P6.3.
D. h. w. is heated up to the desired temperature set with parameter S4.10.
When d. h. w is warmed and the temperature of solar collectors exceeds the maximum tem-
perature of solar collectors - parameter S6.2 and S6.1=1, d. h. w. warming is allowed up to
the maximum temperature of d. h. w - parameter S4.3.

S6.14=2 - HP heat pump is controlled in accordance with the outdoor temperature
and maintains the calculated heat accumulator temperature. Max. permissible opera-
tional temperature of HP is limited with parameter S6.15. If outdoor temperature
drops below limit outdoor temperature set with parameter S6.11, HP is switched off.