See figs. 5, 6, and 7.
7.1
The system must comply with the requirements of BS 6798
and BS 5449.
7.2
The appliance must not be operated without the system
being full of water, properly vented and pressurised.
7.3
The pressure relief valve operates at 3 bar (45lb/in
2
). The
discharge must be directed away from electrical components or
where it might be a hazard to the user.
7.4
The pressure gauge indicates the system pressure which
must be maintained.
7.5
The 8 litre expansion vessel is charged to 0.5 bar and is
suitable for a static head of 5 metres (17.5ft). The pressure can be
increased if the static head is greater than 5 metres (17.5ft).
7.6
With an initial system pressure of 0.5 bar, a system capacity
of about 83 litres can be accommodated. Refer to BS 7074 Pt. 1
for more information. The charge pressure can be increased but
with a decrease in system volume.
7.7
The appliance includes a system filling link.
7.8
Water loss must be replaced.
7.9 Filling the System.
(See figs. 6 and 7.)
Remove the bottom panel to gain access to the filling loop
assembly. (The grey knob for the filling loop is packed in the
hardware pack and should be fitted as shown.)
Insert the bayonet end of the filling key into the corresponding
cut-outs in the filling loop housing and twist to lock the key in
place.
Turn the grey knob anti-clockwise to allow water ingress and fill
until the required pressure is reached.
Turn the grey knob clockwise to stop filling and remove the filling
key by lining up the bayonet end of the key with the cut-outs in
the filling loop housing and withdrawing the key.
N.B. The key must always be removed from the filling loop
housing after the system has been filled to prevent accidental
filling and to comply with Byelaw 14 of the Water Byelaws
Scheme.
Store the key safely for future use.
7.10
Repeated venting loses water from the system. It is
essential that this water is replaced and the system pressure
maintained.
7.11
Connections to the mains water supply must not be made
without the authority of the local Water Company.
7.12
The pump is set at maximum and must not be adjusted.
7.13
Connections in the system must resist a pressure of up to 3 bar.
7.14
Radiator valves must conform to BS 2767:10.
7.15
Other valves used should conform to the requirements of
BS 1010.
7.16
No special system inhibitor is needed.
7. Sealed Primary Systems
9
Fig. 5. Sealed primary water system
APPLIANCE
(Refer to
Fig 1. for
appliance
water flow
diagram)
Mains
cold
water
Domestic hot
water out
Heating
return
Heating
flow
Lockshield
valve
Radiator
valve
Relief Valve
discharge
Condensate
drain
Water
Main
British
standard
stop valve
fixed spindle
type
NOTE: A drain cock should be installed at the
lowest point of the heating circuit and
beneath the appliance.
Fig. 6. Filling Loop.
Fig. 7. Filling Key inserted for filling.
Grey filling
knob
Always remove key
after filling
Filling Key
Summary of Contents for 26CDi Xtra
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