GAH Electrastream, User And Installation Instructions Manual

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Fig. 4-4c Heating Expansion Vessel, TPR Valve and Filling Loop
HEATING EXPANSION VESSEL
FIXING BRACKET
HEATING FLOW
TPR VALVE DISCHARGE
DOUBLE CHECK VALVE
ISOLATING VALVE
MUST BE DISCONNECTED
WHEN NOT IN USE
MAINS SUPPLY
4-4.8 Motorized Valve
A Honeywell V4043H Motorised Valve is supplied, this should be fitted in the Heating
Flow from the cylinder prior to any take offs and wired as shown in fig. 3-3a.
The valve is normally closed to prevent gravity feed from the cylinder to the heating
system, when the pump starts the valve opens.
4-4.9 Bypass
An automatic bypass valve should be fitted between the flow and return of the heating
system, normally after the pump but before any radiator take offs. The valve must be set
to suit the pressure of the system.
4-4.7 Filling Loop
A Filling Loop comprising a flexible hose, double check valve and an isolating valve is
supplied for filling and topping up the system.
The filling loop should be fitted between the incoming mains (before water softener) and
the heating system return as shown on page 4 and fig. 4-4c.
When not in use one of the hose unions must be disconnected as there must not be a
permanent connection to the mains supply.
INST INST INST INST INSTALLA ALLA ALLA ALLA ALLATION 4 TION 4 TION 4 TION 4 TION 4
44444