OJ Electronics WLM-1FS User Manual - page 2
-3ºC
Max allowed supply water temperature.
Winter
Outdoor temperature
Winter
Design supply water temperature at outdoor temperature –3°C
Design supply water temperature if used without outdoor compensation module.
Return
Summer
Outdoor temperature
Summer
Supply water temperature at outdoor temperature 25ºC
Return
Supply Water Temperature Control
Using supply water sensor for limitation of supply water:
A limit sensor should be used with the WLM 1FS & WLM 3FS, but can be used without the weather compensation module (WLOC). In this case the
master will control the supply water temperature flowing into the system via the 3 or 4 port mixing valve and actuator. The factory default setting is 45°C,
but can be changed via the master display.
Using outdoor compensation module for weather compensation
When the outdoor compensation module (WLOC) is connected to the system, the master calculates the correct temperature, taking into account the
heat losses that will vary depending on the outdoor temperature, and the room temperature requirements of the system. For example, on a day when the
outdoor temperature is 12°C, it is possible to run the heating system with a supply water temperature of only 35°C. this ensures economical running of
the boilers, and comfortable room conditions throughout the year. The max allowed supply water temperatur prevents excessive water temperatures if
the outdoor temperature becomes extremely cold, e.g. - 30°C.
45ºC
25ºC
30ºC
55ºC
Max supply temperture
The max allowed supply water temperature is set according to the design
requirements of the installation (line A on the curve). This is the safely
maximum.
Weather compensation
Winter
A design outdoor temperature and the corresponding design supply
water temperature are set (point B). To increase the heat output, adjust
the supply water temperature higher, until you feel comfortable (we
recommend only a 2 degree adjustment of this temperature at a time, and
timer allowed for the system to respond).
Summer
An outdoor temperature and the corresponding supply water temperature
are set (point C). To increase the heat output, adjust the supply water
temperature higher (we recommend only a 2 degree adjustment of this
temperature at a time, and timer allowed for the system to respond)
The master calculates the intersection point D
Compensation for outdoor temperature can only be done if an outdoor
compensation module (WLOC) is installed. Without outdoor
compensation module the Master will adjust after allowed supply water
temperature 45°C.