Glow-worm 56/3e Back Boiler - Manual (Page 11)

11 221725B
4 Installation
4.5 Heat Shield Assembly
If the boiler electrical supply cable has to be routed down the left
hand side of the combustion chamber you must fit the heat
shield assembly and clips supplied in the fittings pack. Refer to
Section 5.1 and diagrams 5.2 and 5.3.
4.6 Circulating Pump
Isolating valves, integral if possible, must be fitted each side of
the circulating pump.
4.7 Gas Supply
Remove the combustion chamber extension by slackening the
two securing screws and removing the two base securing
screws, see diagram 4.5.
The gas installation must be fitted in accordance with the
recommendations of the current issue of BS6891.
Do not use pipe of a smaller diameter than Rc 1 /
2
( 1 /
2
BSP) inlet
or 15mm, see diagram 1.1 for position of gas connection.
The gas meter must be capable of passing natural gas at the
following rates: 58.3ft
3 /h to 88.5ft 3 /h (1.65m 3 /h to 2.51m 3 /h).
This rate is in addition to all other natural gas appliances
supplied from the same meter.
It is recommended that the gas supply enters the builder’s
opening on the right hand side.
If the gas supply enters from the left hand side it will be
necessary to route the pipe behind the combustion chamber
before final fixing.
4.8 Positioning the Back Boiler
To position the back boiler lift by the heat exchanger casting
and place centrally in the builder’s opening. The installation
centre line is indicated by a cut-out on the front edge of the
base, see diagram 4.6.
The back boiler must be positioned so that a line across the
opening of the fire fixing wall face coincides with the marks
indicated by an 'A' on the appliance, see diagram 4.6.
Check that the back boiler is level. If packing is required to
adjust the level of the back boiler, use metal shims and pack
under the full width of the base.
Mark through a minimum of two of the five fixing holes available,
see diagram 4.7. Remove the back boiler unit. Drill holes using
a 5mm masonry drill bit to accept the plugs and fixings provided.
4.8 Positioning the Back Boiler - continued
Fit the flueway baffles, ensuring that they are fitted correctly into
the flueways, see diagram 4.8.
NOTE: The front flueway does not have a baffle.
NOTE: If the heat exchanger has been turned the baffles must
still be fitted into the back and middle flueways only.
Fit the spigot duct to the draught diverter assembly with the two
securing screws supplied in the fittings pack, see diagram 4.9.
Fit the draught diverter assembly onto the heat exchanger with
the two securing screws supplied in the fittings pack, see
diagram 4.9.
Fit the lint arrester over the air intake hole, secure with retaining
clip. Push fit the sensing tube onto the flue blockage safety
device and draught diverter. Secure the sensing tube assembly
with the securing screw, see diagram 4.10.
Diagram 4.5
SECURING
SCREW (2)
Slacken,
Do not remove
6844
COMBUSTION
CHAMBER
EXTENSION
BASE
SECURING
SCREW (2)
Where a flexible flue liner is being used, fully fit the No8x 3 /
8
" self
tapping screw provided into the rear of the flue socket as in
diagram 4.11.
Reposition the back boiler unit into the builder’s opening.
Connect the system pipework to the back boiler unit, pre-
plumbed pipework.
Connect gas supply to gas service cock. Leave gas service
cock in the “OFF” position, see diagram 4.12.
NOTE: When connecting the gas supply use a spanner to
support the gas service cock, see diagram 4.12.
If a flexible flue liner is being used, position the liner in to the flue
socket. Using two No8x
1 /
2
" self tapping screws, coloured black,
from the fittings pack, screw through the two remaining holes in
the flue socket to centralise and secure the flue liner, see
diagram 4.11. Seal with a suitable fire clay cement.