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4.
INSTALLATION WARNING:
CARE SHOULD BE TAKEN TO ENSURE THAT NO FOREIGN
MATTER IS LEFT IN EITHER THE GAS OR WATER PIPEWORK AS
THIS COULD CAUSE DAMAGE TO THE APPLIANCE
5.
SAFETY VALVE
The safety valve may be removed and sealed if the boiler is
fitted to an open vented system. The safety valve drain
connection must be directed away from any electrical
components_ See Section 13.8
6.
ELECTRICAL SUPPLY
Mains supply 240V- 50 Hz, 240 watts. External Fuse 3 amps.
7.
CONTROLS
All controls included with the appliance are specified in Section
18-Short Parts List, included m
th1s
booklet. There is
pro-
vision for a room thermostat and frost thermostat to be con-
nected to the appliance. See Section
11-Elt•c!rical
Thermostatic radiator valves can be used in the system but a
suitable by-pass is recommended with this type of controL
When using a sealed primary system, particular care should
be exercised that only radiator valves of high quality to BS
2767,10 should be f1tted.
B.
DRAINAGE
A drain cock to drain water from the boiler and the heat bank
is fitted in the prpe connecting the primary heat bank to the
sealed system pressure vessel. A drain cock should also be
fitted to the lowest point of the system
9.
MAINS COLD WATER SUPPLY PRESSURE
If the mains supply pressure to the appliance is expected to be
low, it is recommended that a 22 mm diameter supply pipe is
used from the rising main to the appliance
10. SHOWERS, BIDETS, TAPS AND MIXING VALVES
Standard hot and cold taps and mixing valves used with the
appliance must be suitable for operating at mains pressure.
The use of a thermostatically controlled shower valve will give
added comfort and safeguard against flow of water at too high
a temperature. If
a
loose head shower is fitted then the hose
rnusl be fixed to prevent the shower head falling closer than
25 mm
(1
m_) above the top edge of the bath to prevent it being
immersed in the bath water. Alternatively an anti-syphonage
device must be fitted. Hot and cold mains fed water can be
supplied to an over rim flushing bidet, but is subject to local
Water Authority requirements.
3
11. APPLIANCE OPERATION
See Fig. 1.
The appliance output is range rated for central heating from
8.8 kw (30,000 Btu/h) to 22.9 kW (78,000 Btu/h). The output
is preset at
15
kW
(51
,200 Btu/h). If this output is not suitable
it should be adjusted to match the central heating require-
ment. The domestic hot water output is preset at 22.9 kW
(78,000 Btu/h) and must not be adjusted. See Section 14-
Commissioning the Appliance.
The control system ensures the heatbank is maintained at the
temperature set by the hot water temperature control ther-
mostat
With the Operating Switch (or Programmer) in the heating and
hot water mode, priority will be given to satisfy the heatbank.
Hot water will automatically be diverted to the central heating
system, the temperature being regulated by the central
heating temperature control thermostat.
With the Operating Switch (or Programmer) in the domestic
hot water mode, no heat will pass into the central heating
system. Domestic hot water may be drawn off at a nominal
rate of 21 litres/min. (4.5 gal/min.) governed by two pre-set
flow restrictors located in the cold water inlet manifold.
The appliance includes a domestic hot water pump and a
central heating pump. With the appliance in the domestic hot
water mode both pumps are energised. The domestic hot
water pump circulates primary water around the heat bank
and the central heating pump circulates primary water around
the heat bank and the boiler
With the appliance in the central heating mode the domestic
hot water pump is de-energised and the central heating pump
is energised. Primary water then circulates around the boiler
and the central heating system.
In the event of an unacceptable rise in temperature of the heat·
bank due to continuous operation of the burner a high limit
thermostat is fitted which will shut down the boiler. This over-
heating is caused by a tap not being turned off properly and
allowing a very small flow of water past the heat bank control
thermostat ph1al
An overheat thermostat is fitted to the flow pipe from the boiler
section. In the event of a malfunction, thE! gas pilot circuit will
be interrupted which will completely shut off the gas valve
12. PACKAGING
The appliance is despatched in one package
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