Vaillant VCW 25 1 T3W, VCW-SINE 18T3W, VCW 20 1 T3W User Manual

Instructions

for Installation

and Servicing

Vaillant

Combined appliances

for

heating

and

This aooliance shall Codes of

CORGI

These the installation

Practice by British Gas or by an

member)

instructions should be left near the

be installed in

is completed.

accordance

authorized

gas

domestic

VCW-sine 18 T3 W

with the relevant

installer

meter when

hot water

VCW 2Ol1 T3 W

GC-No. 47 04403

VCW 2511 T3

GC-No. 47

GC-No.

Domestic hot water

04405

47

O44 01

Central

W

heating

Contents

lntroduction

1.

2.

Construction

J.

General

4.

lnstallation Water Commissioning Assembling

7. Servicing

8.

q

Foult

10.

Short

11.

Technical

2 Construction

of aPPliance

reouirements

boiler

of

circulation

combi

of

finding

ports

list of

data

system

and

heater

testing

of

P4e The

2 natural draught

2 4

^l ;\ ;; ,;

46 61 64 system

ApPliance

1 lntrcduction

Vaillant csnbi

VCW-sine, instantaneous

Output The

open ahd sYSIem.

Circulating devices

Note to ln hard supply

room-sealed)

ratings are shown

is designed

boiler

vented

includes

pump,

only),

provided

are Installers

water areas

to the appliance

boiler

open-flued

domestic

system

the instantaneous

expansion

terminal

wall-rnqrrH

is a

(or

in the case d

with buifr

boiler

hot water

in

for use

with

box,

with

we recommend

via a

is

heater,

"Technical

in

a sealed c

pumped

(forseald

vessel

control and

the appliance.

scale

Dda-.

circuldin

w&

hot

sdetf

the d

reducer.

it

2

trin I

-24

9 11

23 22

14

18 19

21

o

N

3

o

l Fkrcorinection 2 Down draught diverter 3 Sensorof 4 Mainheatexchanger 4a

Combustion Main hrmer

5 6 Gasgovernor 7 Flowswitch

Differential valve

8

DC

9

10 Fbwthermometer 11 Pump 12 Pressuregauge

\a-

l

vent

air

overheat cut-off

solenoid

with

automatic air vent

points

chamber

device

Terminal

13 14

Switch switch, domestic hot water switch) Domestic heat

15

Flowthermostat

17

'18

Pressure relief valve

19

Service cock

20

Gas service cock Overflow

21

Push

22

Push button stop

23

Pilot burner

24

Piezo unit

25

box

(main

board

exchanger

(optional

button start

switch,

extra)

heating

o o

'6

=

o

General

3

The accordance the Gas tions, the

It

vant

relevani British

CP 331

BS 5376

BS

3.2

3.2.1 The

oermit ierminal. adequate around

electrical with boiler

Where be

give A

Safety

l.E.E.

Water Undertaking.

local

be

should

requirements

recommendations

Standard

Installation

lown

Part

Selection of gases).

Part

Central

5449

oremrses.

Part

Location

Vcwqjle

location

the

The

space

the installed attention l.E.E.

in an

boiler specifically board that

Details compartment instdllations

in any

is cjrawn

Regulations

provisions

respect

in a room

installation

the

unusual

necessary

detailed

compartment

must

iompartment

or

modified

it is

of

requirements

documents

the combi

of

with the

Begulations.),

Regulations, in accordance

the

of

Codes

of

gas,

Low

3:

pipes.

and

gas

space

2 Boilers

exceeding

heating

1 Forced

syslems.

(8.F. APP|iance)

dhosen

provisions

location for servicing

The combi

heater.

room,

to

of

the

to

containing

location,

BS

and

guidance on

used

be designed

purpose. An existing

this

for

the

for

essential

design

given

are

boiler

relevant

for

installation

including

requirements

and

also

local authority

of

Practice:

of

pipes Pressure

installation

heating

rated

of

60

circulation

the combi

satisfactory

of a

must also

and air

although

the requirements

in Scotland,

and,

the building

bath or

a

combi boilerwill

of the

special

5546 and

this aspect.

to enclose

and constructed

may be

purpose.

features

in BS 5376

must be

regula-

building

the byelaws

with any

the

and

(1

. and

kW. for domestic

boiler

of the combi

procedures

used

of

airing

rele-

the

and

following

meters installation

2. family not

inPut

hot water

must

boiler

flue

provide

circulation

may be

particular

of

regulations,

shower.

may

BS 5376

the combi

cup-

provided

cupboardi

cupboard

: 2.

cP

in

of

BS 5440

ot

BS 5446:

for

We connection sealed ditional obtaining 3 .)

It is

by competent above correctly

your ihat the

3.2.2

The

permit

bdequate

provide

circulation

The combi

the

containing

the

recommended be

the combi

special

be

5'326 this

: 2

combi specifically bbard that

Details

compartment

installations

342 Centralized

Part

Part 2

hot water

1 Individual

Buildings

dwellings.

Flues

appliances

60

ding

Part 1

kW

Flues

of

(1.

rated

and

air suPPlY

and

Part 2 Air suPPlY.

1979 Installation

supplies

like to drawyourattention

primary

and

8

Safety

Gas

the law

regulations.

own

VCW

location

fitted

:2 and

aspect.

boiler or iompartment

it is modified

the

for

circuit

water undertaking

upon a

consentfora

(1)

from

Regulation,

that all

persons

lead

bould

interest

law is complied

(O.F.

chosen

provision

the

air supply.

adequate

around boiler

bath or

a

that

in a bedroom.

boiler

procedures

BS 5546

A compartment

must

this

for

of essential

design

are

of

for domestic

filling or

from

relaxation

the Secretary

gas

appliances

in accordance

Failure

prosecution. This

to

that of safety

and

with.

APPliance)

for the combi of a satisfactory

The location

space

the appliance.

not be installed

must

shower.

the combi

Where

in

be

will

may be

give

be designed

purpose. An existing op-

may be used

purpose.

for the

features

including

given

in BS

suPPlY

dwellings,

than

other

for

input not

familY

2.

gas

hot

PurPoses

tothefactthd

replenishing ol

a supply

1972:

to

for servicing

an

detailed

pipe

seeking aa

otits

of State.

are

install appliar a

to erisG

boiler

must fu

In addition,

should

boiler

installationd

the

unusual

necessary

guidanceot

to enclosete

used

and construec

of cupboard

cupboad

airing

: 2.

5376

is

can

Byeh

ins{d

with t:

b L

nrrsl

flue ad

ard *

rqq

in a

it

rd

posilb\

and BS

provided

a

,

b

supply

Gas

3.3

3.3.1 Service The

installation

planning

gas

local

4

pipes

region should

in order

stage

be consulted

at the

to establish

availability

the An existing

prior

out

consultation

an adequate

of

service

pipe

with the

must

gas.

of

supply

not be used

gas

local

regiorl

wit>

Meters

3.3.2 gas

A

meter is

connected

gas

local

the contractor.

An

existing

that it is capable of

2.95 ms/h

(or

3.38

2.47 melh

installed.

Flue

3.4

Detailed in BS

5440

give general

to

VCW-sine

3.4.1

\=i=

The

boiler

terminal is Termination should be on a clear expanse

wall; the terminal being

600 mm projecilon.

Do not install the terminal: Within

a)

from the vent,

b) Within

ground Within

c)

the terminal.

lmmediately

d) Where the lowest

than 2 m balcony, flat roof access, guard

of durable

guard

is available as an optional extra with combi boiler. The air inleVproducts and the terminal of the boiler must not than 50 Detailed recommendations

combustible

VCW

3.4.2 Detailed recommendations for fluing

in BS 5440 : 1 . The following notes

give general guidance.

to The

cross sectional combi boiler must be not less the flue outlet of the appliance. An supplied to allow the fitting of 125 mm pipe

or 125 mm light When fitting flue connector disconnection of

16).

fig.

region

meter should be checked to

(106

(122

mslh

(89

CFH)

system recommendations for fluing

: 1. Thefollowing notes

guidance.

(B.F.

must be installed so that the flue

exposed

(2

ft.) awayfrom acorner, a recessora

mm

300

bottom of an openable window,

or any other

mm

300

level.

600 mm

beneath eaves or a balcony.

(6,6

ft.) above the level

mm

material

(O.F.

must

or

material.

(2

in.)

Appliance)

the terminal must

to the

a local

or

passing

CFH) before the VCW

CFH) before

the VCW-sine 18)

before

Appliance)

to the external

preferably

(1

ft.) measured

ventilation

(1

ft.)

above adjacent

(2

ft.) of any

part

the termlnal

of

place

to which

protected

by

A terminal

to combustible material.

on

given

are

area of

asbestos cement

pipes

fitted

be the flue

in BS 5440 : 1.

the flue

than the

a split

to ensure

pipe (see page

pipe

service

gas

region

ensure

an additional

the VCW

not less

opening.

surface facing

of any

Drotection

are

intended

are

air.

vertically

is less

ground,

people

protective

outlet duct

be closer

are

intended

are

fitted to

area of

adapter is

steel flue

flue

socket

25

given

than

have

by

the

given

the

pipe.

easy

13

lnstallation

3.3.3

by

Installation

with CP

must a smaller

20

connection.

or

The

is

soundness

Flue from

a) Asbestos cement, b) Aluminium c) Cast-iron

lf double-walled flue

of

a type acceptable to British lf

that is acid-resistant with acceptable if the 540 materials in

air

connection chimney or lined with a non-porous material it should be lined with

flexible flue liner or any type acceptable to British meter in the technical mustbe kepttoaminimum. lf to be connected

a

draught diveder a flue constructed from above should draught diverter and

Before inserting a liner into,

of

previously swept clean of any soot register fitted connecting the liner into, the flue.

The the relevant 5440:1, table 4.

A terminal found fitted

The 600 or any other ventilation

331

Pipework

be of a adequate

complete installation

pipes

one of the following materials:

lined.

a chimney

composed of or lined with a nonporous

salt-glazed earthenware

: 1 .) A flue

is to

of the liner must

connecting the combi

plate,

in the flue, it must

flue should terminate

satisfactory by British

the flue

at

point

(2

mm

pipes

should

:3.

from the meter

than

size

as described in the

fittings

and

or stainless steel,

acid-resistant

is

used it

material.

pipes

pipe

a) to c) above

to lined

be used which is not composed

data and the number

directly to the combi boiler

one of the materials in

form

the connection

used, the flue must

restrictor

combi boiler to, or inserting

recommendations

of a type

outlet.

of termination must ft.)

of an openable window,

fitted

be

in accordance

to the

size. Do not

the

should be constructed

pipe

is

preferably

comply with BS 65 and

constructed from

should

chimneys. Where

other

Gas.

not be less than

flue

liner.

a flue that has been

and

plate,

that has

opening.

combi

use

combi boiler

must

be tested

above

vitreous

used it should be of

Gas.

should be one

(Chimneys

pipes

one of the

form the initial

acid-resistant

a stainless steel

liner

that is of a

The internal

thefluelinerisnot

pipe

which is

between

boiler

be thoroughly

loose material. lf

damper etc.

be removed before

in

accordance with

given

been tested and

Gas

should be

not be within

boiler

pipes

gas

Code.

enamel

lined

dia-

shown

joints

of

to

a)

the

to,

in BS

air vent

of

for

are

a

of

c)

or

a

is

a

c

Air supPlY

3.5 Detailed

given in intended

3.5.1 The

located vent an adiacent

itself i-n" same

3.5.2 Where

cuoboard are case combustion compaftment

recommendations

BS 5440

give general

to

Room

or

room

must

be

must

'have

sizd

Cupboard

combi

the

or

required

open

6f

of

Pos.

vents

air

High

Level

LOW

Level

The

2.

:

guidance.

internal

or

space

have

either

room

permanent

a

compartment,

(for

and

at

space

in which

permanent air

a

to the

direct

internal

or

to

direct

compartment

or

is to be

boiler

cooling

appliances

flued

flue dilution)

high and

vcw20/1 vcw25/1

VCW-sine

vcw20/1 vcw25i1 VCW-sine

supply

for air

following

air

the

permanent air

purposes and

low level'

air supply

the

outside

space

vent of

outside

installed

in the

notes

boiler

vent'

which

air supply

also

cupboard

These air

This or

air

must

least

at

The

air.

vents

in

Airfrom

internal

cmz 280

320 235

560 640

,235

minimum vent(s)

are

maximum

are

is

to

The balanced does

have a oermanent

vents

internal

or

in a

the

for

or

minimum

The

vents

air

compartment are ielated the unit.

room

space

,

{42)

(50) (36,5)

(84) (1 (36,5)

effective

is specified

rated

Appliance

vcw20/1 vcw25/1

require

not

either

must

space

etfective

required

are specified

to the

vent areas

Air

or (inr)

00)

area

below

input

heat

combi

flued

room

the

vent.

air

communicate

direct

or be

areas in the

niaximum

Airdirectfrom

cm2

140 160 120

280 320

120

permanent

of

is

and

the unit.

of

cmz

108 130

boiler,

internal

or

to outside

the

of

below

rated

outside

I

to

16 20

VCW-sine,

space

the

with

air.

permanent

cupboard

(Tab. 1)

input

heat

(inr)

(21) (25) (18,5)

(42) (50) (18,5)

air

the

to

room

or

and

of

Tab.1

Both

Note:

the

both

be air.

Effect

3.5.3 is anv

lf there oremises iir ipittag"

3.6 Detailed

circulation

5449 heatinq notes not forming should and

6

there area

inlet

of

Water

(Jor

:1

svstems)

ire

belnsulated

possible

air

same

on

an

of

tvpe

i6 from

products from

the

circulation recommendations

system

small

particular importance.

of

pbrt

freezing,

room

the

extract

of

possibility

the

are

bore

and

the

ot

internal

or

wall

same

fan

extract

outside

system

given in BS

and

342-

CP

useful help

to

particularly

communicate

must

vents

or

space

the outside

to

fitted

fan

if adequate

that

provided

is not

open

the

for

5376

bore

micro

prevent heat

following

the

Pipework

heating

where

surface

with

must

the

in

flued

water

BS

:2'

central

loss

pipes

cupboard

Where communichte

room

the

permanent air

combi

is

fan occur

must

taken.

are underfloor

Draininq oosition-s svstem water

1/2 in.

2879.

BS

internal

or

boilers

in operation.

a spiilage

be carried

through

run

sPaces.

taps

which

including

system.

nominal

or

the

with

vent(s)

could

flue

test

out

roof

must

permit

the combi

Dlaining

size

compartment

or

room

must

space

specified

as

when

occur

such

Where

detailed

as

and

be

and

necessary

any

spaces

located

draining

the

heater

should

taps

in accordance

be

vents

air

internal

and

space

have

itself

in 3.5.1.

extract

the

installations

BS 5440.:

in

actlon

ventilated

in accessible

whole

the

of

the

and

least

at

be

with

a

1

hot

Electrical supply

3.7 Wiring

The combi boiler

external

installed in accordance

be Regulations apply.

4 lnstallation

4.1 General

The combi

flat area of

vertical measure as shown

This

area does

installation and servicing.

fitted on a

be

should

material.

\-

In addition. a minimum clearance of

to the combi boiler

and any

local regulations which

is

supplied

of

is to be wall-mounted and a

boiler

wall is required which must

on template-

not include

wall

of combustible

protected

by a sheet of fireproof

with the l.E.E.

for 22O/24O V,

boiler

clearance

lf the

appliance

material,

must

the wall

400

50 Hz. Fuse rating is The

combi boiler has to the mains terminal

For wiring

(16 appliance to enable the servrceo.

Service clearance of 150 mm side

For the

for

and

is

the flue. The 2

cartons, one containing the carton containing the terminal/duct delivered with the balanced flued appliance.

mm

electricity supply

box.

instructions

in.) must

is reouired.

open

25/1

an additional clearance is required for

installation

o

o c

o6 >o-

FO.

(U

3 A.

be connected

paragraph

see

be available at the front of the

flue

combi boiler is supplied in

accessories. An additional

combi boiler to be

type appliances VCW 2011

the

vcw20/1 vcw25/1

using the internal

direct to

4.7.

(6

inches)

either

boiler, the other

assembly

is

F

,l

E-

Fig.3

All

dimensions

in mm

A 1095 mm 1161 mm

B

D

r

1014mm 1080 mm

K

weight 59 kg 60 kg

Minimum distance

)

remove expansion vessel.

130mm

125

mm with adaoter

15mm 22mm

'l00mm

Electrical

connection

107mm

mains

required to

Installation may require another distance.

7

Fluing

4.2 installation

the

For room .!-o"t"i"

iniluded

-in.t"llation

sealed

with

4.3 Connection A oeneral

coinection

The

view

is

following

installation.

The

woit< 40

gas

toi

for domestic

mm

and

distance

wall

8

of

combi

every

pipework

of

given

procedure

(to

hbating

flue

the

boiler,

nstructions

i

flue set.

5.

fig.

in

finished

the

system

water

PiPework'

(wall

set

reter-to

we

gas

for

describes

wall)

is.50

case)

No'

and

ot a

rne

806901

water

the

pipe-

of

mm and

Fig.4

All dimensions

1. Compression svstem)

z. S-ervice

3.

4. Union

5.

6.

7. Service

8.

9.

cock

Domestic

(gas)

service

Gas

water

Cold

cock

flow

Over

Pressure

hot

cock

connection

(optional

relief

10. Compression system) Connection

11.

Frame

23.

support

of appliance

union

(flow

of

water

(return

valve union

mm

in

(flow

system)

heating

connection

shut-off

with

heating

of

extra)

(return of

(lower

connection)'

heating

of

valve

system)

heating

!

;

t

,,4

I

lnstallation

4.3.1

4.3.1.1 fixing

After

template

the

holes.

fixing

type

The

wall.

of

4.3.1.2 After

the

hano

holes

the 5 fit the

holes

fixing

flued

Open

connecting

the

position

in

used

of fixing

sealed

Room

installinq

connecting

the

tempi-ate

8

with

where

aids

boiler

combi

group to

ancl

will depend

combi

terminal/duct

fixing

the

on

(5/16

group.

inches)

Use

mm

necessary.

thewall

posltlons

mark

on the

boiler

assembly,

(1

bolts

and

)

diameterto

the alternative

put

oI

type

drill

I

**!**o

rl

I ll

fl | )l

+1-

I

Domestic

4.3.2 connection

-

Flush

supply

connecting

-

the

Fit riqht

water

h5t union ln hard

(2)

should

-

bhect ness.

Thecombi

N.B.

oressure bxceeds will

10

cold

all

out

pipe

grouP.

domestic

compression

hand

pipe

(3).

area

water

be

domestic

of

this a

have to

watel

hot

and

loreign

before

to

via

boilerhas

10 bar.

be

matter

connecting

water

mains

union

left hand

the

mains supply

the

reducer'

a scale

system

water

amaximumworking

lf water

pressure reducing

to cold

fitted

the

from

the

to

pipe (2)

compression

water

the

to

the

and

to union

for sound-

pressure

valve

inlet.

I

t

{33

Gonnection of heating

Fledirtg

2. rrtn cqrtecting

Ftl

syslem flow

copper

group

lhe heating system

return

and

pipe

and connected

as

shown in fig.

and test for

system

should

9. soundness.

be in

to

the

4.3.4 Pressure relief valve pressure

The system, is included into

-

Screw pressure (To

4.4 Fitting Close service cocks

take

and Refit union nuts

(7).

rings

I

and unscrew

relief

in

relief valve into

be availableas

the appliance

off the

Close mains water

the union nutF

valve, required

the

overflow

an optional

(5),

unscrew

olive-shaped

(6)

with

and overflow

for

a sealed

connecting

(4)

the

brass'compr6ssi-on

service

(9).

group.

below

drain line.

extra.)

union nuts

plastic

plugS.

cock

the

(6)

(8)

*-A-6

flued

Open

4.4.1 from

pait

boiler

ing

unions

bolts(1)

the

8.1'1.),

in

aids

tubes

Unpack oarieis las inO the ionneciions.

connection oiession it on to

aPPliance

carton

lint

well

as

the

Insert

downwards

service

the

of

fasten

and

remove

and

arrestor

(as in 8'2'2)

plastic caps.from

as

appliance

into

cocks

screws

the

and

wltn

(10)'

side

tne comhang

compression

Fasten ig),

4.4.2 Unoack

Janels blastic

buct the t;le6copic

assemblY. Insert

downward service bolts

compression is,

(11,fig.13).

using

Balanced

(as baps

(20)

the

cocks the

of

iig.

thb

boiler

in 8.1.1

irtitn

appliance

iirio

13)

unions

attached

lued

f

carton

from

.) and the

from

2 sheet

tne

(16)

duct

with

compression

the

hang

and

case

wall

unions

using

(6,

(6)

and

(1

washers

aPPliance

packing

connections.

(1),

fig.

the

1)'

remove

and

aids

metal screws

terminal/duct

the

of

connection

the

unions

to the

on

it

14.

fig.

13) and

attached

union

wellas

as

Fit the

(22) to

threaded

Fasten

union

washers

nuts

side

flue

tubes

the

of

nuts,

nuts

Fig.

14

1 Fixing

Telescopic

16

22 Sheet

1 9,

Flue

20

Flue

2'l

bolts

duct

bend

20

duct

metal

21

screw

12

45 Gcconnection

Frt the

Cleil s.Dpty service

Connect and tighten.

a

Flue connection

4.6 Insert flue

the adapter A

split ensure simplify

gas

service cock

foreign matter from the

all

out

pipe

cock!

gas

the

into the

provided.

socket connector must be fitted

easy disconnection of the flue

removal of the main heat exchanger.

(5)

to the appliance.

before connecting to the

pipe

(open

to the

flued)

service cock

supply

draught diverter after fitting

gas

to

F--i

tl tl tl

ri

to

22.

22.aCollar otthe draught diverter

24. Adapter

25. Splitsocketconnector

4.7 Electrical Vaillant

only necessary to connect the

a

and the room thermostat. 50 Hz. electrical sgpply fused 3 A.

Warning!This appliance must After removing the terminal

the mains to the terminal the manner indicated

label

showing the correct mains connection

the terminals is in

remove before connecting. Do not

pump Full wiring diagrams for various

schemes are shown

diverter

connections

combi boilers are completelywired. lt is

the

connect the electrical supply to the

terminals

(b).

intig.21 Io 24.

pipe

. Flue

21

Draught

electrical mains

Connectto220/240v

be earthed.

box cover connect

(c)

of the appliance in

below. A cardboard terminal

box. Please

to

control

Connection

4.7.1 shown

As

is coloured

*nicn

terminal

the inO the Dluq. 6e on tne oi coloured i" rn"

"opiiin"" oi svmbol O vellow iimer

linked.

a.

b. i-

4.7.2

--

Connection

terminiri

Vaillant resistance. inJiiiteo

neiiner livinq therftostat

be

iotfurt

be icceleiating is ior

,nit "an oi Wfren bridge

4.7.3 The

ways

Settinq

Setting

tetminal

tne

to

The

ioni"ct"O

aoptiance

coioureO

qreen

otine

and

on

installbd,-terminal

is

2

Fuses Terminals Terminals

Connection thermostat

g

room

on

Ov

rooin.

followed.

the

requlated

not connected,

i"iting

bi

OriOge

a

tfrE

must

PumP

pump

(see

(as

I For-use systems.

thermostat.

room

ll

For"use svstems.

valve

o'as

ttl

seltting

Purip affected

the

of

figures

the

on

brown

marked

the

A

anO

current

the

purposes'after

fig.

runs

with

marked

wire

neutral

terminal

the

to

black

two

to the

or

plug.

(delay for for hppliance

room

of

thermostat The an

During

For

Vaillant

resiitance.

op6rated

between

room

be

control

may

suPPlied)

with

Pump

with Pump

switih

bY

the

to

and

the

on

yellow

and

teiminals

terminal

coloured

no

lf

action).

pump regulating'

Vaillant

of

clock

with

thermostat

recommended

is

4. lt room

wall

inner

air

of

the

manufacturer's

sake

the

room

a

by

to operate

by

ihe

thermostat

removed.

controlled

be

20): clock

is switched

thermostatic

is switched when

Permanently

external

cable

mains

conductor

live

the

connected

be

must

the

L on

a

L or coloured

coloured

marked

terminal

plug' The

be

must

marked

green or

thermostat

room

input

(RT) with thermostat

which

nor by

installation

combi

lf the

provisional application

and

gas

controls.

4 must

and

3

connections'

room

(no'

394)

is made

accelerating

is

the sun,

of

indications

economy

of

boiler

thermostat

room

heating

the

installation,

the terminals

wired

is

in one

room

off by

radiator

off

valve

and

to

appliance

on

red

must

blue

a

with

marked

earthwire

connected

the

on

O

an

wrth

green ano

or

be

the

to

install

to

De

must

influenced

the

in

room

the

must

and

should

with

thermostat

system

the

and

3

this

in

three

of

thermostat

clock

valve

clock

by

closes'

is

N N

E

a

4'

not

or

Fig.18

1

..'\L*=

LEf,-l

-j

@@_a

@a

t

Sz

14

i

Thcrmostatic

1,7,

TRVs and a

l$rere ilibfrirg betreen

lYhere

side of the clock is connected

teminals 3 and

no clock is used a

inserted between

pump

Setthe

VCW-Terminal

Fig.21

control to

VAILLANT Roomthermostat VBT378

radiator valves

clock

are used the

4. wire

bridge

lerminals 3 and 4.

position

ll.

0

must be

RANDALL

TimeSwitch 103

Do

not link

terminal3

N L

& 6

Mains Supply

24OV/5OHz

I

a

VCW-Terminal

VAILLANT Roomthermostat VRT378

SWITCHMASTER

O

0

300

Time

1)

2)

Switch

REMOVE

Link N

and 2

Link

L and:4

N

Mains

L

Supply

24OVlsOHz

3

15

Fig.23

LLANT

VAI Foomlhetmostat

3 78

vRT

HORSTMANN COFONET

Time Switch

link

not

Do terminals Land5!

N

t.in" SuPPIY

L

2r0v/50H2

J

125

3

o

l':-'

VAILLANT Roomthermostat VRT 378

16

O

N Mains

SUPPIY

0

L

24ovl5oHz

+

B

l I

I

b

i

E

-9-

6=O

E;E

9p5

;

a

E

o a

cl c

3

p

o

c

o o

a?

o

"9=i

E$s

a

lt^

ol

988-

x*'t

:oo o(g

F

.o

(,

CD lo

(o

I

3

o

'

o

=

;

",

1

EY

r()

AI

.st,

tt

E

o o o

c

'=

15 14

13 '12

11 10

9 I

7 6

5

70 71

73 54

5:l

Fig.26

flow

cock

switch

1 service 3 4 thermostatic

gas inlet

5

6 automatic

pilot

7

switch

I

9 oush

pilot

10

push button

1 1

thermo-magnet

12

micro

13

thermo-couple

14

pilot

15

valve

adiustment

box/FFD

button

valve

switch

burner

element

screw start stop

0t[|il[[|ll

overheat

1 6 sensor 17 main 18

19

20

21 22 main i3 24 25 26 i8

29

of

excnanger

heat

screw

venting

air expansionvesset

burner

main

governor

gas

burner double-stage venturi

differential DC expansion pump

solenoid

valve vessel

/-ffi

cut-off

..

adjustment

burner

main

pressure

21

n

23 24

25 77 26

30

2A

n

31

58

61 7A

46

1 32

device

screw

valve

control

18

-'_-43

N--.a.-:.*.

water

sedlon

inlel

water

governor.

outlel

control

resistor

hot

.

switch

*"*"'

micro-switch

58

water

:li"#3[?t!l3ll

3?

32 39

i

41

X3

$i[#s$:rrtt:"'

53 54

circutr

heating

switch

main terminal

tlo"o"*

rn"rto""'

micro-switcn

micro'switcn

o"'"""'ic

t. ll

water

59

cold

60

water

61

water

hot

63

!3il'J3-:Y':ilvarcr

3e

electronic

70

NTC

71

"1.1H,$3#3f;'ftL

1?

systembypass

78

relaY

79

19

Vaillant VCW 25 1 T3W, VCW-SINE 18T3W, VCW 20 1 T3W User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual