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5
SYSTEM REQUIREMENTS - CH (continued) and HOT WATER
5.
Filling. The system may be filled by one of the following
methods:
a. Through a temporary hose connection from a 'draw-off'
tap, supplied from a service pipe under mains pressure.
Where the mains pressure is excessive, a pressure
reducing valve must be used to facilitate filling.
i. Thoroughly flush out the whole system with cold
water.
ii. Fill and vent the system until the pressure gauge
registers 1.5 bar, and examine for leaks.
iii. Check the operation of the safety valve by raising
the water pressure until the valve lifts. This should
occur within 0.3 bar of the preset lift pressure.
iv. Release water from the system until the minimum
system design pressure is reached; 1.0 bar if the
system is to be pre-pressurised.
6
SYSTEM BALANCING
The boiler does not normally need a bypass but at
least some radiators on the heating circuit, of load of
at least 60% of the boiler output, at minimum rate, i.e.
60% of 10.1 kW (34 500 Btu's) equals 6 kW
(21 000 Btu's) must be provided with twin lockshield
valves so that this minimum heating load is always
available.
Note.
Systems incorporating zone valves which could
completely cut off the flow through the system, must
be wired such that the boiler will not fire or continue
to fire when this occurs.
7
CONDENSATE DRAIN
Refer also to the British Gas document: 'Guidance Notes for
the Installation of Domestic Gas Condensing Boilers'
(1989)
A condensate drain is provided on the boiler. This drain must
be connected to a drainage point on site.
All pipework and fittings in the condensate drainage system
MUST be made of PLASTIC - no other materials may be used.
The drain outlet on the boiler is standard 22mm overflow pipe.
10
GENERAL
DOMESTIC HOT WATER
Domestic Hot Water Requirements
The boilers are suitable for connection to most types of
washing machine and dishwashing appliances.
When connecting to suitable showers, ensure that:
•
the cold inlet to the boiler is fitted with an approved
anti-vacuum or syphon non-return valve.
•
Hot and cold water supplies to the shower are of
equal pressure.
IMPORTANT
Provision MUST be made to accommodate the expansion
of DHW contained within the appliance, if a non-return
valve is fitted to the DHW inlet.
BALANCING
1.
Set the programmer to ON.
Close the manual or thermostatic valves on all
radiators, leaving the twin lockshield valves (on the
radiators referred to above) in the OPEN position.
Turn up the room thermostat and adjust these
lockshield valves to give boiler flow and return
temperatures not more than 15
These valves should now be left as set.
2.
Open all manual or thermostatic radiator valves and
adjust the lockshield valves on the remaining
radiators, to give around 11
each radiator.
3.
Adjust the room thermostat and programmer to
NORMAL settings.
IMPORTANT
External pipe runs must be insulated to prevent possible
freezing.
A Siphon Kit is available - see instructions supplied with the
kit.
o
C apart.
o
C temperature drop at
Response SE Combi -
Installation
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