1 general – Glow-worm 56-2 Back Boiler User Manual

Page 3

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221781A

INJECTOR
MARKING

1 General

RANGE RATING

NOMINAL

HEAT INPUT
(GROSS)

Btu/h

NOMINAL

HEAT
OUTPUT

Btu/h

BURNER

mbar

SETTING
PRESSURE

in.w.g

18.5

20.2

21.9

63,200

69,000

74,800

RANGE RATING TABLE

3.7 203001

13.8

15.2

16.5

47,100

51,950

56,450

9.8

11.7

13.7

3.94

4.70

5.5

Minimum Medium

Maximum

1.3 Gas Supply

The gas installation shall be in accordance with the current
issue of BS6891.

The supply from the governed meter must be of adequate size
to provide a steady inlet working pressure of 20mbar (8in wg)
at the back boiler.

On completion test the gas installation using the pressure drop
method and suitable leak detection fluid, purge in accordance
with the current issue of BS6891.

1.4 Electrical Supply

WARNING. This back boiler must be earthed.

All system components shall be of an approved type and shall
be connected in accordance with the current issue of BS7671
and any applicable local regulations.

Connection of the back boiler and system controls to the mains
supply should be through a double pole isolating switch, fused
3A having a minimum contact separation of 3mm in both poles.

Alternatively, a fused 3A 3 pin plug and unswitched socket
outlet to the current issue of BS1363 may be used.

Wiring to the back boiler must be PVC (85

C) insulated type to

the current issue of BS6500 Table 16, not less than 0.75mm

(24/0.20mm).

1.5 Site Requirements

Refer to diagram 1.1 for dimensions appropriate to the back
boiler.

For all types of installation a standard sized builder’s opening
is required, see diagram 1.2.

It is important that the opening is cleared of debris and mortar.

It is recommended that the access hole for pipework into the
fireplace or builder’s opening is either at the left hand or right
hand side of the chimney breast. If access is required at both
sides then it may be necessary to prepare some of the
connections before fitting the back boiler into the builder’s
opening.

The prepared base for the back boiler must be level.

Refer to Table 2 for dimensions of fire front fixing wall face
which must be true.

1.6 Water System - Open Vented

This back boiler can be used on an unrestricted open vented
system with the water supply taken from a feed and expansion
cistern, having a head between 1m (3ft3in) minimum and 27m
(90ft) maximum.

Diagrammatic layouts of systems are shown in diagram 1.3 and
1.4.

1.7 Sealed Water System

A kit and instructions, part number 426520, is available to
enable the back boiler to be used on a sealed water system.

Please give the serial number of the back boiler when ordering
the kit.

Dimensions
for
minimum
flat area
(no fixtures)

Dimensions
for fixture or
surround
protection
clearance

3013

FRONT

OPENING

ALL DIMENSIONS IN MM

PREPARED
BASE

G.C No.

Teak

Mahogany

T a b l e 1

FIRE TYPE

Miami 3 BBU

37-047-04A 37-047-07A

Melody 3 BBU

37-047-06A

Black Ash 3

37-047-08

Saxony 3

37-047-09

Brown Ember 3

37-047-02

T a b l e 2

FIRE

TYPE