Glow-worm 45/2 Back Boiler - Manual (Page 7)

7 221780A
3 Flue and Ventilation
3.4 Ventilation - Back Boiler and Fire Front
It is important that the room in which the back boiler unit is
installed has adequate air inlets to ensure correct operation as
specified in the current issue of BS5440 Part 2.
Ventilation requirement for this back boiler is:
75cm 2 (12in 2 )
This ventilation area takes into account the total requirement of
the back boiler unit and any of the specially designed gas fire
fronts.
The ventilation openings may communicate direct with outside
air or with an internal room or space (such as a hall) which itself
is provided with a permanent air vent of the same effective area.
The permanent air vent should be in a position which minimises
nuisance to occupants due to draughts.
This vent must NOT be placed in the builder’s opening.
If the appliance is to be installed in a room already containing
another fuel burning unit, the air supply required for this other
unit MUST be added to the figure above.
Any air vent taken through a cavity wall must be ducted.
3.5 Extract Fans
If an extract fan is fitted in the premises, there is a possibility that
if adequate air inlet openings are not provided spillage of the
products of combustion could occur.
When openings are fitted in accordance with the
recommendations of the current issue of BS5440 Part 2, extract
fans should not cause spillage.
Where such a fan installation is found, a clearance of products
test must be conducted as described in the fire front Installation
Instructions.
This test must be carried out with the back boiler fitted with its
fire front.
See also Section 6.3 of these instructions.
4.1 Preparation
Remove draught diverter, flueway baffle and fittings pack from
carton.
Remove back boiler body assembly from carton.
4.2 Water Connections
IT IS EXTREMELY IMPORTANT THAT NO SERVICE PIPES
ARE ROUTED IN FRONT OF THE BACK BOILER.
If the builder’s opening was previously used for solid fuel all
pipework within should be protected with PVC tape or equal.
Pipework passing through walls of the opening should be
sleeved and made good.
The four heat exchanger connections are tapped Rc1 and are
all on one side of the heat exchanger, see diagram 1.1.
4.3 Pumped Heating with Gravity Domestic
Hot Water
All pipework must comply with the current issue of BS5546.
The domestic hot water flow and return pipes must be 28mm.
The domestic return must be into the connection directly below
the domestic flow connection.
Refer to diagram 1.3 for a diagrammatic layout.
If it is necessary to route pipework from both sides of the
builder’s opening, it is recommended that the heat exchanger is
positioned on the combustion chamber so that the gravity
circuits exit on the same side as the back boiler connections.
It is recommended that pumped heating connections are
prepiped as in diagram 4.2.
If the heat exchanger connections are opposite hand to that
required, the heat exchanger can be turned, as follows, remove
the four screws securing the heat exchanger to combustion
chamber, see diagram 4.1. Turn heat exchanger, refit the four
screws.
4 Installation
Diagram 4.2
Diagram 4.1
PUMPED HEATING - WITH GRAVITY HOT
WATER PRE-PIPING
5188
1595
HEAT
EXCHANGER
SECURING
SCREWS (2)
SECURING
SCREWS (2)
COMBUSTION
CHAMBER
28mm
168mm
22mm
30mm
MIN.
40mm
MIN.
380mm
MAX.
95mm
196