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TRQ 21 W
1
Application
The TRQ 21 W is a room thermostat with
continuous output for controlling the Junkers
gas heating equipment listed in
This room thermostat with timer has proven
effective with heaters for single story living
quarters with an area of up to approx. 80m
The thermostat complies with the legal regu-
lations.
The TRQ 21 W is not suitable for buildings
with floor heating or air conditioning.
2
Technical Data
Height
Width
Depth
Rated voltage
Rated current
Controlling range
Minimum Temperature
change rate
Thermostat output
Permissible ambient
temperature
Operating reserve
Protection class
Testing class
With VDE symbol
3
Safety Instructions
The TRQ 21 W room thermostat is
connected directly to the gas heating
equipment. Do not connect the ther-
mostat to the 230 V mains.
Use the TRQ 21 W only in conjunction
with the Junkers gas heating equipment
listed in
to
6
11
4
Installation
4.1
General
The selection of a suitable mounting location
is important for the control quality of the
room thermostat. The room in which it is
mounted must be suitable for controlling the
6
to
11
.
82 mm
165 mm
42 mm
DC 24 V
0.01 A
6 °C ... 30 °C
0.05 K/min
Continuous
2.5 V ... 24 V
0 °C ... 35 °C
50 h
III
IP 20
.
temperature of the complete heating system.
The radiators installed in the room should
not be equipped with thermostatic valves.
It is more effective to install hand valves that
can be preset so that the output of the radia-
tor in the room where the TRQ 21 W is
mounted can be set as low as possible.
2
.
Select a mounting location on an interior wall
if possible and take care that neither drafts
nor heat radiation can affect the thermostat.
Adequate space must be provided beneath
the thermostat so that the air in the room can
circulate unrestricted through the ventilation
openings (crosshatched area in
the recommended distances in
4.2
Attaching the Thermostat
Remove the top part of the thermostat (a)
from the base (b) for mounting. This is done
by prying open the housing with a screwdri-
ver ( ).
1
The base (b) of the TRQ 21 W can either be
mounted with two screws (d) to a standard
flush connection box (c) of 55 mm diameter
(
) or mounted directly on the wall with
4
plugs (6 mm) and screws (3.5 mm dia., oval
head) ( ). Use the enclosed drilling templa-
5
te for this purpose.
4.3
Electrical Connection
The TRQ 21 W room thermostat is opera-
ted with a direct current voltage of 24V that
is provided by the gas heater over a three-
conductor connecting cable. The control sig-
nal to the heater is also conducted over this
cable.
To prevent interference, this cable must be
laid separately from lines carrying 230 V or
400 V. If external inductive influences can
be expected, for example from power ca-
bles, a shielded cable must be used.
GB
). Observe
2
2
.
7
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