3
These boilers require a natural gas supply of 1.6 to 2.0 cubic
metres per hour. Gas supply pipework of not less than 22mm
diameter should be run to the appliance and to within 300mm of
the gas valve (gascock) and should be installed in
accordance with BS6891:1988. (i.e. The pressure drop
between meter and appliance not to exceed 1mbar).
The gas connection to the appliance is Rp
1
/
2
(
1
/
2
in B.S.P.) Entry
holes are provided through the controls chassis.
The complete installation must be tested for soundness and
purged as described in the above standard and in accordance
with Corgi recommendations.
The appliance requires a 230V ~ 50Hz single phase 3A fused
electrical supply which must be installed in accordance with the
current IEE Wiring Regulations and any Local Regulations
which apply. Detailed wiring instructions are given in Section 10.
Power consumption is approximately 140W for the appliance,
with the Central heating pump rated at an additional 40W to
88W depending upon pump speed.
WARNING : THIS APPLIANCE MUST BE EARTHED
Note: This appliance may be installed in any room or internal
space, although particular attention is drawn to the
requirements of the current IEE Wiring Regulations, and in
Scotland, the electrical provisions of the Building Regulations
with respect to the installation of the appliance in a room or
internal space containing a bath or shower. Where a room-
sealed appliance is installed in a room containing a bath or
shower, any electrical switch or appliance control, utilising
mains electricity should be so situated that it cannot be touched
by a person using the bath or shower.
4. ELECTRIC SUPPLY
3. NATURAL GAS SUPPLY
The appliance must be installed on a flat floor capable of
supporting the weight of the unit when full of water – up to
185kg. It should be sited to minimise the length of flue and to
avoid long hot water pipe runs.
The extended flueing capability enables the appliance to be
sited well away from an outside wall, thus installation in a first
floor cupboard or compartment, basement, utility room or
kitchen are all feasible locations. The appliance must not be
sited outside or in any outhouse where it could be exposed to
the weather.
The location chosen must permit the provision of a satisfactory
external flue termination. The location must also provide
adequate space for servicing and air circulation.
If floor settlement is likely due to the weight of the appliance,
ensure that pipework design is able to accommodate this.
When using an extended flue system it is essential to fit
protective ducting (such as that supplied in the extended flue
kits) in order to prevent direct contact with the hot flue pipe.
General requirements for cupboard/compartment installations,
including airing cupboards, are given in BS6798. Specific
requirements for Powermax installations are given below.
a The compartment must be ventilated at high and low
level in accordance with BS5440:Part 2 and Section 7
of these instructions.
b The compartment shall be a fixed rigid structure large
enough to allow it and the boiler to be inspected and
serviced. A minimum width between the door jambs of
550mm (21in) must be provided.
c Internal surfaces should be non-combustible or lined
with non-combustible material. Examples of non-
combustible materials having a fire resistance of not
less than 0.5 hour are plaster skimmed plasterboard,
and fireproof boarding. The floor need not be lined.
Doors or shelves made from combustible material, e.g.
wood must be at least 75mm from the front or top of
the boiler.
d The door of an understairs cupboard shall have a
BS476:Part 8 fire resistance of not less than 0.5 hour;
and air vents must be direct to outside air.
e The flue pipe must be protected by the ducting supplied
by Baxi UK or by another no less suitable non-
combustible enclosure.
f Householders should be discouraged from storing
clothes etc on the boiler itself. A removable shelf at
least 75mm above the boiler is acceptable.
Detailed recommendations for flueing are given in
BS5440:Part 1. The following notes are intended to give general
guidance. The appliance must be installed so that the flue
terminal is exposed to the external air, preferably on a clear
expanse of wall. Acceptable positions are indicated in Fig.5.1.
Avoid positions where the terminal is adjacent to projections;
particularly immediately under a balcony, inside a re-entrant
position, or immediately adjacent to a drain pipe.
If the appliance is fitted under a ventilator or opening window,
the terminal must be at least 300mm (12in) from any part of the
window or ventilator, and in accordance with BS5440:Part 1.
Requirements for horizontal
balanced flue terminations
Compartment Installation
Flue Protection
General
5. SITING THE APPLIANCE
Powermax
Sealed System
Schematic
AIR VENT
PRESSURE
RELIEF
CH FLOW
CH RETURN
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