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Boiler
Fig. 2a
Flow
Boiler
Return
Fig. 3
1
Supplied By www.heating spares.co Tel. 0161 620 6677
Copper
Copper
0.5m
0.5m
Copper
1m
22mm
Open Vent
Air Vent
Indirect
15mm
Cylinder
Cold
Feed
Pump
Radiator
Circuit
Fully Pumped System
3.0 System Details
3.3
1. The sizes of the flow and return pipes from the
boiler should be determined by normal methods
according to the requirements of the system.
2. It is recommended that the system is
designed for an 11°C (20°F) drop in temperature
across the system.
Flow
Return
3. In systems using non-metallic pipework it is
necessary to use copper pipe for the boiler Flow
and Return. The copper must extend at least 1
metre from the boiler and include any branches.
The copper pipe must not be insulated (Fig. 2a).
3.4
1. For optimum operating conditions, the system
in which the appliance is installed should include
a control system.
2. Such a system would comprise a timer control
and a separate room and/or cylinder thermostat
as appropriate.
3. The boiler should be controlled so that it
operates on demand only.
4. It is not economical to rely on the boiler
thermostat to control operation of the system.
3.5
1. The sizes of the system pipes should be
determined by normal methods.
2. The open vent pipe should be a minimum of
22mm and must rise continuously to a point
above the feed and expansion tank.
3. The flow pipe from the boiler may form part of
the vent pipe. No part of the open vent should
contain a valve.
Pipework
System Controls
Fully Pumped System (Fig. 3)
7
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