Boiler
Pump
Flow
Return
400mm
Min Head
22mm
Open Vent
15mm
Cold
Feed
1000mm
Min
150mm
Max
500mm
45
o
Boiler
Pump
Flow
Return
22mm
Feed & Vent
Pipe
200mm
Min
Air
Separator
Boiler
Pump
Flow
Return
22mm
Open Vent
15mm
Cold
Feed
1000mm
Min
150mm
Max
500mm
45
o
Automatic
Air
Vent
400mm
Min Head
Typical Low Head Installation
Alternative Layout
Alternative Low Head Installation
9
System Controls
For optimum operating conditions, the heating system
into which the boiler is installed should include a
control system.
Such a system will comprise of timer control and a
separate room or cylinder thermostat as appropriate.
The boiler should be controlled so that it operates on
demand only.
Operation of the system under control of the boiler
thermostat only, does not produce the best results.
Pipework
The sizes of flow and return pipes from the boiler
should be determined by normal methods, according to
the requirements of the system.
It is recommended that the system is designed for an
11 °C (20°F) drop in temperature across the
system.
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.
Fully Pumped, Open Vented Systems
Low Head Installation
Using a close couple arrangement the minimum head
is as shown in the diagram, subject to the following
conditions:
1) The correct heat input.
2) The pump being adjusted to give an 11
o
C drop
across the boiler.
3) The pump must be fitted on the flow.
4) The pump must be fitted in accordance with the
pump manufacturer's instructions.
5) The open vent pipe must be taken up from a tee
in a horizontal section of the flow pipe.
Alternative Low Head Installation for all Solo 2 RS
If less height is available then a combined vent and
feed pipe may be connected. This must be a minimum
of 22mm diameter. It is recommended that an air
separator is fitted when using a combined feed and
vent pipe.
Boiler
Flow
Return
Copper
0.5m
Copper
1m
Copper
0.5m
Copper Pipe In Non-Metallic System
