Domestic Hot Water - IDEAL HE24 Installation And Servicing

4 SYSTEM REQUIREMENTS - CH (continued) and Hot Water
5. Filling
Where the mains pressure is excessive a pressure reducing
valve must be used to facilitate filling.
a. Thoroughly flush out the whole system with
cold water.
b. Fill and vent the system until the pressure
gauge registers 1.5 bar and examine for leaks.
c. Check the operation of the safety valve by
raising the water pressure until the valve lifts.
This should occur within 0.3 bar of the preset lift pressure.
d. Release water from the system until the
minimum system design pressure is reached;
1.0 bar if the system is to be pre-pressurised.

DOMESTIC HOT WATER

1. The domestic hot water service must be in accordance
with BS 5546 and BS 6700.
2. Refer to Table 1 for minimum and maximum working
pressures.
In areas of low mains water pressures the domestic hot
water restrictor may be removed from the inlet valve. The
boiler will require the flow rate to be set to obtain a
temperature rise of 35
3. The boilers are suitable for connection to most types of
washing machine and dishwasher appliances.
4. When connecting to suitable showers, ensure that:
a. The cold inlet to the boiler is fitted with an approved
anti-vacuum or syphon non-return valve.
b. Hot and cold water supplies to the shower are of equal
pressure.
5 SYSTEM BALANCING
The boiler is fitted with an automatic bypass.
BALANCING
1. Set the programmer to ON.
Close the manual or thermostatic valves on all radiators,
leaving the twin lockshield valves (on the radiators referred
to above) in the OPEN position.
Turn up the room thermostat and adjust these lockshield
valves to give boiler flow and return temperatures not more
than 20 C apart.
o
These valves should now be left as set.
12
o
C at the tap furthest from the boiler.
GENERAL
Water Flow Rate and Pressure Loss
Max CH Output
Water flow rate
Temperature Differential
Head available for
system pump.
5. Hard Water Areas
Where the water hardness exceeds 200mg/litre, it is
recommended that a proprietary scale reducing device is
fitted into the boiler cold supply within the requirements of
the local water company.
IMPORTANT
Provision MUST be made to accommodate the expansion of
DHW contained within the appliance, if a non-return valve is
fitted to the DHW inlet.
2. Open all manual or thermostatic radiator valves and
adjust the lockshield valves on the remaining radiators,
to give around 15
3. Adjust the room thermostat and programmer to NORMAL
settings.
See note regarding thermostatic radiator valves on page 11.
kW 23.8
(Btu/h) (81 200)
l/sec 0.38
(gal/min)
o
C
o
( F) (27)
m.w.g.
(ft.w.g.)
C temperature drop at each radiator.
o
Esprit -
Installation and Servicing
4.8
15
2.3
7.5