Connection Of The Mains Cable; Connection Of Vaillant Room Thermostat; Pump Control - Vaillant VCW 2O Instructions For Installation And Servicing

4.7.1 Connection of the mains cable
As shown on the figures the live conductor
*nicn is coloured brown must be connected to
the terminal marked with a L on the appliance
inO to tne tetminal marked L or coloured red on
the Dluq. The neutral wire coloured blue must
6e ioni"ct"O to the terminal marked with a N
on tne aoptiance and to the terminal marked N
oi coioureO black on the plug' The earthwire
coloured qreen and yellow must be connected
i" rn" otine two teiminals marked O on the
"opiiin"" and to the terminal marked wrth an E
oi svmbol O or coloured green or green ano
vellow on the plug. lf no room thermostat or
iimer is installbd,-terminal 3 and 4 must be
linked.
a. Fuses 2 A (delay action).
b. Terminals for pump regulating'
i- Terminals for hppliance input connections'
4.7.2 Connection of Vaillant room
--
thermostat with clock (no' 394)
Connection of room thermostat is made to the
terminiri g anO 4. lt is recommended to install a
Vaillant room thermostat (RT) with accelerating
resistance. The room thermostat must De
inJiiiteo on an inner wall which is influenced
neiiner Ov current of air nor by the sun, in the
livinq rooin. During the installation of the room
therftostat the manufacturer's indications must
be followed. For the sake of economy and
iotfurt
the Vaillant combi boiler should
be requlated by a room thermostat with
icceleiating resiitance. lf the room thermostat
is not connected, to operate the heating system
ior i"iting purposes'after the installation, the
,nit "an bi op6rated by provisional application
oi a OriOge between ihe terminals 3 and 4'
Wfren tfrE room thermostat is wired in this
bridge must be removed.
4.7.3 PumP control
The pump may be controlled in one of three
ways (see fig. 20):
Settinq I (as suPPlied)
For-use with clock and room thermostat
systems. Pump is switched off by clock or
room thermostat.
Setting ll
For"use with thermostatic radiator valve
svstems. Pump is switched off by clock or
o'as valve switih when gas valve closes'
seltting ttl
Purip
runs Permanently and
is not
affected bY external controls.
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