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Halstead VBX 18, Installation And Servicing Instructions, Page: 20 / 20

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Halstead VBX 18 Installation And Servicing Instructions Download Page 20

18

17

Room 

thermostat

Cylinder 

thermostat

Mid 

position

valve

230V 

mains input

A

B

C 1

2

4

5

6

7

1

3

2

4

5

2

LN

6

5

98 3 2 1

9 2 3

34

5

6

7

E

LN

89

10

2

1

HW

Off

HTG

HTG

On

NL

2

7

8

3

1

2

3

White
Blue
Grey
Orange
Green/

yellow

CT200

T4360A

 

Frost

thermostat

Opens 

heating 

circuit only-use with

programmers with spot switching

1

3

1

5

L641A

V4073A

Programmer

Or

Time

controller

Boiler

V4073A

Mid 

position

zone 

valve

Pump

N

E

L

1

7

34

63

34

N L

N L

N L

Honeywell ST6998 1002

(Link L-5-3)ST 799A

2= Pump live

1=Switched live

L=Permanent live

ST6400 ST6300

ST6200

7643

21 E N L

L N E

21

T6360B Room thermostat

230V 50Hz

Pump

Boiler

L2

L3

E

N

L1

T6360B

Room

thermostat

L641A

Cylinder

thermostat

21

3

1

2

C

Fully pumped 'Y' Plan

Optional

Blue

Green/yellow

White

Grey

Orange

Pump live

Switched live

Per

mament live

FULLY PUMPED ‘Y’ PLAN

18

Internal 

heater resistor

3mm air gap

Fuse

3A

Fuse 2.5A

Cylinder

thermostat

Room

thermostat

Frost

thermostat

Fused switched

isolator

Boiler controls

or gas solenoid

Boiler pump

over run

N   

N   

L   

L   

L   

L   

C   

C   

C   

L   

L   

L   

L   

L   

L   

N   

N   

N   

N   

N    L   

N   

N   

N   

N   

N   

N   

N/U   

N/U   

N   

N/U   

N/U   

CH on   

CH on   

CH on   

HW on   

HW on   

HW on   

S/L   

S/L   

P/L   

P/L   

Boiler

HW Pump

CW Pump

Basic time clock

Programmer

CH/HW programmer

N/U

Earth terminals for

Controls,Boiler,Pumps,

Electrical mains supply.

N/U

N/U

and

Dema

a

and

Dema

a

and

ema

a

Dem

N

L

E

NO

NO

NO

UPP15-50 PUMP PLAN - WIRING
CENTRE CONNECTIONS

17

19

TYPICAL PROGRAMMER

Pump

Boiler 

Terminals

Room

thermostat

L2
L3

E
N
L1

Pump live

Switched

live

Permament

live

Hot water
Earth
Neutral
230V fused 3 amp

Heating

19

a)

Slacken the screw in the appliance inlet pressure test point

and connect a suitable manometer. Refer to Figure 23.

b)

Check that the gas supply is turned ON and the gas service

cock is OPEN.

c)

Switch on the electrical supply.

d)

Turn the CH temperature Control knob to the midpoint between the

minimum and maximum setting. The display changes from 'o' to 'h'.

COMMISSIONING & TESTING

5

5.1

FILLING THE WATER SYSTEM

Before commissioning the appliance, the whole gas installation
including the meter MUST be purged and tested for gas tightness
in accordance with BS 6891: 1988.

Open all doors and windows, extinguish naked lights,
and DO NOT SMOKE whilst purging the gas line.

It is recommended, where possible, to flush the CH
system without the appliance fitted, to avoid debris
and flux blocking the waterways within the appliance.

Do not use the pressure relief valve to drain the
system, because dirt or debris could prevent the
valve seating correctly. If the valve leaks or sticks
closed, then replace it.

Before commencing the commissioning procedure, ensure that the
gas service cock is turned on, the electricity supply is isolated,
and that the CH pipe-work is complete. Fill the water systems by
following the procedure detailed below in steps a) and b), and
referring to Figure 20.

20

COMMISSIONING THE WATER SYSTEM

To aid venting, a manual air vent is provided on the
LHS of the heat exchanger.

Check the system for soundness.
Drain the entire system to flush out any debris, and refill making
sure that all the air is properly vented from the system and pump.
Repeat this instruction with the system hot. It is recommended that
the system be cleaned with a recognised system cleaner such as
Fernox or Sentinel.
Prior to lighting the appliance to check the gas rates, the central
heating system should be checked for circulation by operating the
appliance with the gas turned off, this is to ensure that no air
locks occur. The appliance may go into ignition lockout and
require resetting.

b) Sealed Systems

Fill the system until the pressure gauge registers 2.0 bar. Clear
any locks and check for soundness.
Check the operation of the pressure relief valve (figure 21) by
lifting the lever on the valve gently to ease the valve of its seat.
Checking that water is discharged, release the lever and ensure
that the valve seats correctly and does not leak. Where this is not
possible a manual check should be carried out.
Release the cold water to the initial design pressure.

!

a) All Systems

A competent person in accordance with the current issue of
BS6798 should carry out commissioning.
Fill the system with cold water. Vent the system via the radiator
valves and system air vents in accordance with normal practice.
Ensure that all system air vents are closed.

New

Drawing

Required

5.2

COMMISSIONING THE APPLIANCE

Refer to Figure 22

21

Summary of Contents for VBX 18

Page 1: ...T R A I N I N G 0 1 9 2 6 8 3 4 8 3 8 Halstead Boilers Limited 20 22 First Avenue Bluebridge Industrial Estate Halstead Essex C09 2EX Telephone 01787 272800 Sales Direct Line 01787 475557 Fax 01787 47...

Page 2: ...nctional Flow Wiring Diagram 25 8 FAULT FINDING 26 8 1 General 26 8 2 Diagnostic LED Indicators 26 8 3 Faulting Finding Codes 26 8 4 Central Heating Fault Finding 26 9 REPLACEMENT OF PARTS 28 9 1 Igni...

Page 3: ...appliance are cured and give no known hazard in this state Insulation Pads These can cause irritation to skin eyes and the respiratory tract If you have a history of skin complaints you may be suscept...

Page 4: ...8 9 kg h 2 36 1 43 Seasonal Efficiency 90 4 91 0 92 4 93 1 Seasonal Efficiency SEDBUK Band A Nox Classification Class 5 Min Central Heating System Pressure Bar 0 1 1 m H2O Max Central Heating System P...

Page 5: ...ue max rate Propane 0 019 0 005 Flue products mass flow rate Nat Gas g s 13 7 8 3 Flue products mass flow rate Propane g s 13 7 8 3 Gas Valve Offset min rate Pa 3 0 Connections Gas 15 mm compression C...

Page 6: ...user interface from its housing see figure 22 c Lower the controls front d Unplug the electrical leads from the PCB Refer to section 7 e Unplug the BCC boiler chip card if fitted f Remove the PCB pla...

Page 7: ...m Roof terminal with rain cover and pitched roof flashing kit a b 3c If the standard horizontal terminal is likely to cause nuisance to neighbours or buildings because of excess pluming then this part...

Page 8: ...ded that to prevent dust the insulation be dampened prior to removal and that a protective mask is worn when changing or handling the insulation material Refer to Figure 43 a Ensure supply voltage is...

Page 9: ...me equivalent length 45 Extension Elbow Allows an additional bend in the flue and has an equivalent length of 775 mm Vertical Turret Socket For use with elevated horizontal flues and vertical terminal...

Page 10: ...e that all joints and seals are correctly re fitted Note The gas control valve is factory set and sealed and is not adjustable If the gas control valve is changed then when the appliance is running th...

Page 11: ...imitations MUST be observed when siting the appliance a The appliance is not suitable for external installations The position selected for installation should be within the building unless otherwise p...

Page 12: ...The complete installation must be tested for gas tightness 3 7 CENTRAL HEATING SYSTEM a The appliances are designed for open vented central heating water systems but may be fitted to a sealed central...

Page 13: ...INDER SINGLE FEED INDIRECT CYLINDERS ARE NOT SUITABLE The domestic hot water cylinder must be of the double feed fully indirect coil type 3 15 SEALED WATER SYSTEMS The installation must comply with th...

Page 14: ...cuit to ensure pump over run functionality 3 18 PRESSURE GAUGE A pressure gauge with a set pointer and covering at least 0 to 4 bar 0 to 60 lb in shall be fitted permanently to the system in a positio...

Page 15: ...plete electrical isolation of the appliance Either a 3A fused three pin plug and un switched shuttered socket outlet both complying with BS 1363 or a 3A fused double pole switch having a 3 mm contact...

Page 16: ...per template in the required position ensuring that the necessary clearances are achieved Ensure squareness by hanging a plumb line b Mark the position of the wall mounting plate fixing holes 4 c Mark...

Page 17: ...products are available from Grundfos Pumps Ltd on 01525 850000 and Pump House on 0115 922 2211 22 ROUTINE SERVICING 6 6 1 COMBUSTION CHECK The appliance incorporates a flue sampling point on the appli...

Page 18: ...flue elbow e Fit the flue terminal to the flue system ensuring that the duct joints are not disturbed and that the external sealing ring is seated against the outside wall f Finally use the internal...

Page 19: ...cluded in the appliance specification ANTI CYCLE DEVICE When the appliance cycles on its central heating control thermostat a slow cycle device operates The timer set to 5 minutes is activated after t...

Page 20: ...s tightness in accordance with BS 6891 1988 Open all doors and windows extinguish naked lights and DO NOT SMOKE whilst purging the gas line It is recommended where possible to flush the CH system with...

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