Vented Systems - andrews RFF190 Installation Manual, Operation And Service Manual

SECTION 3
WATER
CONNECTIONS -
VENTED
SYSTEMS
Fig 3.
10
INSTALLATION
The water heater must be supplied from a cold water feed cistern and the hot water
supply pipe must be fitted with an open vent pipe in accordance with BS 5546. Local
regulations and bye-laws must be observed when installing the system but typical water
service layouts are shown in Figs. 3 and 6.
The cold water feed cistern must have an actual capacity greater than the hourly
recovery rate of the heater or heaters to which it is fitted, the minimum actual capacity
allowed for a feed cistern is 227 litres (50 gall).
The actual cistern capacity is the capacity to the normal water line of the cistern. All
cisterns used should be to the relevant British Standard and the distance from the normal
water line to the top of the cistern should be as laid down by the water authorities.
The cold water inlet and hot water outlet are identified on top of the heater. Connect the
cold water feed and hot water outlet to these nipples with union adaptors for ease of
servicing. (See Servicing Section 6).
CAUTION - DO NOT APPLY HEAT TO THESE NIPPLES IF MAKING CAPILLARY
SOLDERED JOINTS AS THEY ARE FITTED WITH PLASTIC INSERTS. MAKE THE
CAPILLARY JOINTS TO THE PIPES BEFORE CONNECTING TO THE HEATER. A
DRAIN COCK IS SUPPLIED WITH THE HEATER AND THIS SHOULD BE FITTED
TO THE APPROPRIATE BOSS AS SHOWN ON THE DRAWING.
After installation of the water system open the main water supply valve, flush the system
and fill the heater. Open the hot taps to allow air to escape from the system. When the
system is free of air, close the taps and check for leaks at the gas control thermostat,
drain cock and pipe connections at the top of the heater.
Hot Water
Service Pipe
Union
Adaptor
Gas Control
Gas Supply Pipe
Check Valve
Secondary return via
Tee in Drain Port
Overflow
Gas Cock
Open Vent
Stop Valve
Cold Water Feed
Cold Water Cistern
Cold Water
Inlet Valve
Flue
Thermostat
Drain Cock