Technical data
INSTALLATION & SERVICING INSTRUCTIONS
a layer of sealant to seal between the boiler and the wallplate. Lift the boiler and pass the ductwork
through the hole in the wall. Engage the bottom of the boiler on the lower mounting brackets and
secure the top of the boiler with the two wing nuts (B,
Figure 10).
From outside the building, insert the outer flue duct/flue terminal into the wall opening, and slide it into
the inner flue duct. Mark the positions of the two flue terminal fixing holes (D,
Figure 11). Remove the
outer flue duct/flue terminal and make good the external wall surface. Drill and plug the flue terminal
fixing holes to accept No. 10 x 25mm (1 in) screws. Apply a layer of sealant, suitable for external use,
around the edge of the wall opening. Insert the outer air duct into the wall opening, with the welded
seam at the top, and slide it over the inner air duct until the flange seals on the layer of sealant. Seal
the join between the two air ducts on the inside with the tape provided.
Locate the outer flue duct/flue terminal into the inner flue duct and slide into position. Fix the flue
terminal to the wall with the screws provided.
Connect the gas supply to the boiler, see
Section 2.2.
Connect the water system, see
Section 5 . Remove the water circulating pump, flush out the system
with cold water and replace the pump. Fill the system with water, clear any air locks and check for
water soundness, for sealed systems at a pressure of 2.5 bar (36 Ibf/in2)
For sealed systems, pressurise the system to check the operation of the safety valve. This should be
within 0.3 bar (4 lbf/in2) of the preset pressure of 3 bar (44 Ibf/in2). De-pressurise to the desired
operating pressure.
Connect the electricity supply, see
Section 2.3. Remove the control box cover by undoing the two
screws at the front of the box, the cover can then be slid forward and disengaged. Care should be
taken not to damage the thermostat capillary which passes through a grommet in the cover, and not to
allow the cover to hang on the electrical cables.
A terminal block is provided for the supply connections to the boiler, connections for external controls if
required, and connections for the pump, refer to
Figures 8 and 9.
The supply connection to the terminal block (L) must be permanent live, unswitched by any external
controls. The supply cable should pass through the grommet provided, and should be clamped using
the cable clamp provided. The length of the earth wire must be such that if the supply cable slips out of
the cable clamp, the live and neutral wires become taut before the earth wire.
If external controls are not to be fitted, leave the factory fitted link from L2 to SL in position. Otherwise
remove the link.
The connection L2 is a permanent live, internally linked to L, and is provided to feed external controls if
required. SL is the switched live from the external controls, N
2
and
2
are neutral and earth
connections for external controls as required.
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