Rayburn Heatranger 480AG (CF) Installation And Servicing Instructions - Site Requirements
In a combined central heating and domestic hot water
system, the hot water storage vessel must be of the
indirect cylinder type. The hot water storage vessel
should be insulated with not less than 75mm thick
mineral fibre or its equivalent.
Cisterns and pipework should not be situated in areas
which may be exposed by freezing conditions and should
be insulated.
Draining taps must be located in accessible positions
which permit the draining of the whole system, including
the heat storage vessel.
The appliance boiler section should be connected to
cistern water supply, subject to a maximum head of 3 bar
(30m), minimum of .1 bar (1m).
The heating system must be designed (and adjusted if
necessary) to give temperature differential across the
boiler at full output of 10-14
˚
C.When horizontal runs are
used the pipes should rise upwards in the direction away
from the appliance.
Circulating Pump
It is recommended that the selected pump be sized to
suit the boiler pressure loss (see Fig. 2) and therefore
adequate to give the required temperature differential
between the flow and return.
The pump should be able to meet the requirements of
the system design and fitted in a readily accessible
position.
Isolating Valves
Isolating valves (preferably of the keyless type) must be
fitted to the inlet and outlet of the circulating pump to
facilitate service and replacement of pump without
draining the system.
Inhibitor
A corrosion inhibitor
MUST
be added to the heating
system to protect the heat exchanger and pipework.
Inhibitor must also be replaced if the system is drained
after installation. As a precaution the heating system
MUST
also be flushed out prior to the addition of the
inhibitor to ensure any flux, debris is removed.
Sealed System Requirements
See Page 28 and 29.
Site Requirements
WATER CIRCULATION SYSTEM
FIG. 2 Pressure Loss Curve
7
300
600
900
1200
1500