Product specifications

Heating system flow and return connection
The heating flow and return are connected in 22mm copper to the boiler connections (flow and return). The
following connections must be made to the return pipe:-
1) Cold filler loop connection.
2) Heating system 12 ltr expansion vessel and pressure relief valve (part of the Robokit)
3) Towel rail return (if used) must be the last return connection on the system.
The 22mm Y pattern filter (item 1 in fig 2) must be fitted in the CH return pipe to protect the boiler.
If mostly thermostatic valves are used on the heating system it will be necessary to fit a by-pass valve between
the flow and return pipes
Heating system expansion vessel and safety valve discharge system
Connect the heating system 12 ltr expansion vessel and 3 bar pressure relief valve together with the pressure
gauge (components of the Robokit) to the heating return pipe near the boiler. A bracket is supplied with the
Robokit for mounting the expansion vessel on the wall. Assemble the components as per instructions given with
the Robokit. Under no circumstances must an isolating valve be fitted between the expansion vessel and the
circuit which it serves.
The 15mm discharge from the pressure relief valve should be Teed into the pipe that carries the discharge from
the boiler temperature and pressure relief valve and the cold water safety relief valve. The discharge from the
three safety valves must be carried in 22mm pipe and connected to the tundish. The tundish and safety discharge
pipe must be fitted in accordance with the G3 regulations, as described in paragraph 6.7 of the Multi installation
manual. Fit the HepVo trap below the tundish as shown in fig 7.
Blow off from boiler
Blow off from
Heating expansion
vessel
Fig 7
ATMOS MULTI Mk 2 version 2008
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