OJ Electronics WLM-1FS, WLM-3FS User Manual

Master with display type WLM

USER MANUAL

Lagernummer: 57543A 10/04 (BJ)

Day temperatur

e

Temperature set point for all thermostats not part of a clock thermostat group.
Push ( ) accept and ( ) ( ) to adjust the set point.

Night temperatur

e

When activated via an external timer, this action is valid for all thermostats connected to the master. Night setback can also
be activated on individual thermostats (WLTM & WLTD) by using the selector switch and setting to the “night” position. A
clock thermostat (WLCT) will automatically switch to night setback at the times programmed into it, as will all the other
thermostats which are included in its group.

OFF temperature (frost protection)

All thermostats with an override switch (WLTM & WLTD) can be set to an OFF position. This is known as a frost protection
position, and if the temperatur

e in the room shoud fall as low as 5°C, the heating will be enabled to prevent frost damage.

The 5°C level can be changed in the master module.

Max limit temperatur

e for ther

mostats with limit sensor (floor sensor)

Min limit for thermostats with limit sensor (floor sensor)

20.0ºC

15.0ºC

5.0ºC

27.0ºC

17.0ºC

Introduction

The masters type WLM-1FS and WLM-3FS are provided with graphic display to
enable simple pr

ogramming and operations of the unit to be achieved using

simple and easy to understand icons and symbols.

Moving around in the menu

By using the ( ) (UP), and the ( ) (DOWN) you move through the main menu into
sub menus. The description of these submenus can be seen below. If a value
needs to be changed, then press ( ) (CONFIRM) button once, and alter the value
with the ( ) (UP) and ( ) (DOWN ) buttons. Then press ( ) (CONFIRM) to accept
the new value.

If you wish to reset the master to factory settings, then push the ( ) (CONFIRM)
button for 10 sec. until the 6 outputs starts blinking. The master has now been
reset to factory settings.

Control of room temperature

Within the memory of the master, there is a room temperature Setpoint which will
apply for all rooms connected to the system. This setting is at 20°C when the unit
leaves the factory, but it can be increased or decreased as required. Any change will apply to all rooms on the system unless a clock thermostat is employed
(see next para).

Using clock thermostat (WLCT-19):

If a clock thermostat is used as a zone control for one room or a group of rooms, then all the thermostats within this zone will operate according to the
temperatures and times defined in the clock thermostat. However the local thermostats within the group are still capable of being adjusted by ± 4˚C so that
some r

ooms can be set higher or lower than others. The decision as to which thermostats will form part of the clock thermostats group is made by
programming the clock thermostat (see instructions for WLCT unit). Any thermostats that are not part of the clock thermostats’ group will operate to the
temperature as defined in the master control, but again with the option of local ±4°C adjustment.

Using external switch for night setback:

The day temperature set point is defaulted to 20°C and the night temperature to 15°C. These default settings can be changed on the master.
The current operating set point of the master can be changed from the day temperature into night temperature, by connecting a separate timing device to
the master. When the external switch or timer is used to switch to night setback, this will override any time settings in a WLCT clock thermostat, including
any thermostats that are part of a group allocated to that clock thermostat.

Return to main menu

If you are in a submenu and push UP ( ) and DOWN ( ) at the same time you jump back to the menu start position.

Limitation of floor temperatur

es

-3ºC

Max allowed supply water temperatur

e.

Winter

Outdoor temperatur

e

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 cor

rect 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 temper

tur

e

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
W

inter

A design outdoor temperature and the corresponding design supply
water temperature are set (point B). To increase the heat output, adjust
the supply water temperatur

e higher

, until you feel comfor

table (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
ar

e set (point C). T

o incr

ease 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. W

ithout outdoor
compensation module the Master will adjust after allowed supply water
temperature 45°C.