5.
CONNECTIONS
5.1
Connect the CH system
1.
Flush the CH system thoroughly.
2.
Mount the supply and return pipes to the mounting bracket.
All pipes must be mounted tension-free in order to avoid ticking of
the pipes.
Existing connections must not be twisted in order to avoid leaks at
the connections with the external pipes.
The CH system should have been provided with.
•
A filling loop in the return pipe directly below the appliance.
•
A drain tap at the lowest point of the system.
•
A pressure relief valve of 3 bar in the supply pipe at a
maximum distance of 500 mm from the appliance.
Between the appliance and the pressure relief valve there must
not be a shut-off valve or a constriction
•
An expansion tank in the return pipe (see also 5.1.1).
•
A non-return valve when pipes are running upward at a short
distance from the appliance. This prevents a gravity effect
during domestic hot water operation of the appliance.
5.1.1
Expansion vessel
The appliance is fitted with a 6 litre expansion vessel which is adequate
for a system with a water volume not exceeding 100 litres, typically 8
radiators. For larger volume systems, an additional expansion vessel
must be fitted. Contact Atmos for advice in these cases.
5.1.2
Thermostatic radiator valves
Building regulations require a room thermostat to be fitted on all
installations. Do not fit a thermostatic valve on the radiators in the room
where the thermostat is situated, otherwise the controls will not function
correctly.
5.1.3
System bypass
A bypass is not generally required. If, however, the heating system uses
2 port valves which close fully (‘S’ plan), a bypass should be fitted before
the valves.
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