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ecoTEC plus 937 installation and maintenance manual
4.20 Control
units
4.20.1 Vaillant control units and accessories
Controller
Item no.
Connection
VRC 400 (1-circuit controller, weather-controlled)
00 2001 0843
Installation in electronics box (plug-and-play)
VRT 360 (room temperature controller)
00 2001 0842
Wall-mounted, 2-wire bus
VRT 360f (room temperature controller)
00 2001 8258
Wireless controller, receiver wall-mounted
VRT 230 (room temperature controller)
00 2001 0841
Wall-mounted, 3-wire connection to terminals 3-4-5
timeSWITCH 140 (timer)
306 760
Installation in electronics box (plug-and-play)
timeSWITCH 130 (timer)
306 759
Installation in electronics box (plug-and-play)
VRT 30 (room thermostat)
300 637
Wall-mounted, 3-wire connection to terminals 3-4-5
VRT 30 (room thermostat)
0020018265
Wall-mounted, 2-wire bus
Telecommunication
Item no.
Connection
vrnetDIALOG 830 (Int)
00 2000 3988
GSM/GPRS, installation in electronics box (plug-and-play)
vrnetDIALOG 860/2 (Int)
00 2000 3984
Wall-mounted, GSM/GPRS, up to 16 appliances
Accessories
Item no.
Connection
VR 65 control centre for UK cylinder installation (eBUS)
307 215
System solution for UK cylinder connection
vrDIALOG 810/2
00 2002 3370
Diagnostic software
Table 4.1 Vaillant control units and accessories
4.20.2 External electrical controllers
The boiler terminals 3, 4 and 5 on the combi boiler are
for the connection of external controllers, for example a
timer and/or a room thermostat. Terminals 3 and 4 are
linked together from the factory. If external controllers
are used, this link must be removed and the controllers
must be connected to terminals 3 and 4.
Terminal 5 is an additional neutral line for example for
the anticipator of a room thermostat.
4.20.3 Details for the connection of an external
timer to the terminal strip
3
9
8
7
POWER SUPPLY
230 V
50 Hz
L
L
L N
N
N
N
20 VDC
(DO NOT USE 7, 8, 9 IN UK!)
FUSE 3 A
SWITCH
CONTACTS
ROOM
THERMOSTAT
TIMER
4 5
Fig. 4.22 Details for the connection of timers
If it is intended to connect a room thermostat in addition
to a timer, the connection between the ON connection of
the timer and terminal 4 on the combi boiler must be
broken by the contacts of the room thermostat (see
circuit diagram Fig. 4.22).
4.20.4 Optional plug-in timers by Vaillant
Further details for the connection can be found in the
relevant instructions of the accessories. The cover on
the electronics box should be replaced after all the
electrical connections have been made. The cover is
secured with two clips.
4.21 Thermostatic
radiator
valves
The combi boiler is equipped with an automatic
adjustable by-pass valve which makes it ideal for use in
systems with thermostatic radiator valves (an additional
by-pass valve is not required). In the interests of
optimum fuel economy, if thermostatic radiator valves
are fitted they must be used in conjunction with a
interlock block on the combi boiler. A programmable
room thermostat or separate timer and room thermostat
will ensure complete boiler shutdown when the heating
demand is satisfied. (The radiator in the room containing
the room thermostat should not be fitted with a TRV.)
4.22 Frost
prevention
The combi boiler is equipped with an integrated frost
protection thermostat for protecting the combi boiler.
Additional protection measures must be taken to
prevent external or exposed parts of the heating system
and the house, for example the fitting of an external
frost protection thermostat. This frost protection
thermostat should be connected to the terminals 3 and
Sequence of operations during installation 4
