13
CONTROLS.
As a minimum it is r
ecommended that a room
thermostat be installed to control the appliance. Thermostatic
radiator valves may be fitted to the system, however they
must not be fitted in the room where the room thermostat is fitted.
There must be at least one radiator installed with lock shield
valves that should not be closed. Further guidance can be
obtained from the Domestic Heating and Hot Water Guide to the
building regulations.
a)
Check that the mains water pr
essure is sufficient (as stated in 2.2
"Performance Data") to produce the required DHW flow rate, but
does not exceed the maximum DHW pressure (10 bar). If necessary,
a pressure-reducing valve must be fitted to the mains supply before
the DHW inlet connection.
b)
The final 600 mm (24 in) of the mains supply pipe to the boiler
must be copper.
c)
A
void long DHW pipe runs and several hot water draw off
points.
d)
Insulate the hot water pipes if accessible to minimise the heat
losses within the pipes to keep the water hot longer.
e)
A domestic hot water flow r
egulator is fitted within the
appliance to control the maximum water flow rate. This may be
removed to obtain higher flow rates. Higher flow rates will not
damage the appliance but may reduce the water temperature
below an acceptable level. (Refer to Figure 28).
3.8
DOMESTIC HOT WATER SYSTEM
8
TYPICAL SYSTEM DESIGN
Note: No automatic bypass r
equired, however it is recommended to leave one radiator
open to ensure pump over-run function. It is also recommended to fit TRV’s on all
radiators except in the rooms with a room thermostat.
FOR FUR
THER INFORMATION PLEASE CONTACT HALSTEAD BOILERS LTD
SERVICE HELPLINE TEL: 01926 834834
a)
W
iring external to the appliance must be in accordance with the
current I.E.E Wiring regulations (BS 7671) for electrical installation and
any local regulations, which apply.
b)
The mains cable must be at least 0.75 mm2 (24/0.2 mm) PVC
insulated to BS 6500 table 16.
c)
THIS APPLIANCE MUST BE EARTHED.
Failur
e to provide a
satisfactory earth connection will result in appliance malfunction.
d)
The method of connection to the mains supply must facilitate
complete electrical isolation of the appliance. Either a 3A fused three
pin plug and un-switched shuttered socket outlet, both complying with
BS 1363, or a 3A fused double pole switch having a 3 mm contact
separation in both poles and serving only the boiler (and its external
controls) may be used.
3.9
ELECTRICITY SUPPLY
3.10
EXTERNAL CONTROLS
The Ace HE appliances may be used with any cer
tified mains voltage
room thermostat, as described in section 4. For further information
contact: Halstead Boilers Ltd, Service Helpline: 01926 834834.
DOMESTIC HOT / COLD W
ATER SUPPLY TAPS AND MIXING
TAPS.
All equipment designed for use at mains water pr
essure is
suitable.
SHOWERS & BIDETS.
Any mains pr
essure shower or bidet
complying with the Local Water Undertaking byelaws is suitable.
