2
THIS APPLIANCE IS FOR USE WITH NATURAL GAS ONLY.
Contents
Section Page
1. Safety Regulations 2
2. Description 2-3
3. Natural Gas Supply 3
4. Electric Supply 3
5. Siting the Appliance 3-4
6. Flueing Options 4-5
7. Ventilation Requirements 6
8. Technical Data 6
9. Installing the Appliance 6-7
10. Electrical Connection to the Appliance 8
Wiring Diagrams 9
11. Water Supply / Primary System 10-11
12. Commissioning 14-15
13. Servicing Instructions 16-18
14. Fault Finding 12
15. Functional Flow Diagrams 13
16. Short List of Spare Parts 19
17. Installing an Extended Balanced Flue 20-21
18. List of Extended Flue Components 22
19. Optional Immersion Heater 23
This appliance must be installed by a competent person in accordance with
the Gas Safety Regulations and these instructions. Installers must be CORGI
Registered. Failure to install appliances correctly could lead to prosecution.
This appliance must be installed in accordance with the relevant requirements
of the current Gas Safety (Installation and Use) Regulations 1998, Local
Building Regulations, Building Standards (Scotland) Regulations, Current IEE
Wiring Regulations Health and Safety Document No. 635 “The Electricity at
Work Regulations 1989” and the Byelaws of the Local Water Undertaking.
The installation must also comply with the relevant recommendations of the
following British Standards:
Baxi supports the Benchmark initiative and the aims of the programme.
Benchmark has been introduced to improve the standards of installation and
commissioning of central heating systems in the UK and to encourage the
regular servicing of all central heating systems to ensure safety and efficiency.
1. SAFETY REGULATIONS
POWERMAX –
HIGH PERFORMANCE HOT WATER AND HEATING
Installation and Servicing Instructions
Powermax 140 and 155x are combination boilers
in which the gas burner heats the contents of a
built-in thermal store. This heated water is used
as ‘primary’ water and circulated, as required, to
the radiators. Domestic hot water (‘secondary’
water) is heated by a heat exchanger and
delivered via a thermostatic blending valve which
prevents the hot water exceeding 60°C. The flow
rate is governed to a maximum of 12 litres per
minute (140) and 18 litres per min (155
x.
A fully pre-mixed burner is used to ensure that
the gas is burned cleanly and efficiently. Ignition
is fully automatic and the ignition controller
incorporates a flame safety device.
A small diameter twin pipe flue system has been
designed for a length of up to 9.0 metres
(including a balanced flue terminal) through which
to draw inlet air and expel exhaust gases.
The standard terminal suits a wall thickness of
200mm to 500mm.
The appliance thermostat maintains the thermal
store at about 80°C and this stored water is
circulated through radiators via a pump inside the
casing.
A cold start thermostat prevents the pump from
operating until working temperature (approx.
60°C) is attained.
For summer operation the central heating can be
switched off by the user.
CP models come fitted with both CH pump and
an electronic 7-day, 3-event programmer.
Provision is made for fitting both room and frost
thermostats if required.
Installation of Sealed System models only may
fall within the scope of the Building Regulations
1992 (Part G). These require that installation of
an ‘unvented’ system shall only be carried out by
a competent person as defined in the Approved
Document G3. The above requirements do not
apply to a Powermax installed as part of an open
vented system.
Take particular care to avoid damaging outer
panels, switches, programmer etc. Trucking must
be done from the rear.
Store the appliance under cover in dry conditions.
Handling and Storage
Operation
2. DESCRIPTION
BS6891:1988
Specification for low pressure gas
pipework in domestic premises
BS5440:Part 1:1999
Specification for installation of flues
BS5440:Part 2:2000
Specification for installation of
ventilation for gas appliances (except
that compartment ventilation is
amended as in section 7 of these
Instructions).
BS5546:1990
Specification for installation of gas hot
water supplies
BS5449:1990
Specification for forced circulation hot
water central heating systems
BS6798:1987
Specification for installation of gas
fired hot water boilers of rated input
not exceeding 60kW
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