Ideal Heating LOGIC+ COMBI C35 - System Balancing and Water Treatment

15
Installation and Servicing
SECTION 1 - GENERAL
The boiler does not normally need a bypass but at
least some radiators on the heating circuit, of load
of at least 10% of the minimum boiler output, must
be provided with twin lockshield valves so that this
minimum heating load is always available. See note
regarding thermostatic radiator valves on page 11.
Note. Systems incorporating zone valves which could
completely cut off the ow through the system must
also include a 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 the
lockshield valve to give an uninterrupted ow
through the radiator.
These valves should now be left as set.
2. Open all manual or thermostatic radiator valves
and adjust the lockshield valves on the remaining
radiators, to give around 20
o
C temperature drop at
each radiator.
3. Adjust the room thermostat and programmer to
NORMAL settings.
1.19 SYSTEM BALANCING
CENTRAL HEATING
The Logic range of boilers have an ALUMINIUM alloy heat
exchanger.
IMPORTANT
The application of any other treatment to this product
may render the guarantee of Hunt Heating invalid.
If water treatment is used Hunt Heating recommend
only the use of
FERNOX F-1 & ADEY MC1 inhibitors and
associated water treatment products, which must be used
in accordance with the manufacturers’ instructions.
Notes.
1. It is most important that the correct concentration of the
water treatment products is maintained in accordance
with the manufacturers’ instructions.
2. If the boiler is installed in an existing system any
unsuitable additives MUST be removed by thorough
cleansing.
3. In hard water areas, treatment to prevent lime scale
may be necessary - however the use of articially
softened water is NOT permitted.
4. Under no circumstances should the boiler be red
before the system has been thoroughly ushed.
For further information contact Hunt Heating.
........ SYSTEM REQUIREMENTS - CONT
Domestic Hot Water
1. The DHW service must be in accordance with AS/NZS 3500 & AS/
NZS 5601.
2. Refer to Table 1 for minimum and maximum working pressures. In
areas of low mains water pressures the domestic hot water regulator
may be removed. Refer to Section 3.26. The boiler will require the
ow rate to be set to obtain a temperature rise of 35
o
C at the tap
furthest from the boiler.
3. The boilers are suitable for connection to most types of washing
machine and dishwasher appliances.
4. If the shower/mixer valve does not incorporate non-return valves
the following must be followed:
a. The cold inlet to the boiler is tted with an approved anti-
vacuum or syphon non-return valve.
b. Hot and cold water supplies to the shower are of equal pressure.
5. Hard Water Areas
Where the water hardness exceeds 200mg/litre (200 ppm), it is
recommended that a proprietary scale reducing device is tted into the
boiler cold supply within the requirements of the local water company.
6. If the incoming cold water is preheated, such as solar systems, the
maximum inlet temperature should not exceed 25°C.
IMPORTANT. Provision must be made to accommodate the expansion
of DHW contained within the appliance. If the DHW inlet contains a
back ow prevention device or non-return valve, e.g. a water meter,
then a mini expansion vessel should be tted between the device and
the boiler in the cold inlet pipe.
Cold water, rising main and pipework in exposed areas need to
be suitably lagged to prevent freezing.
1.20 WATER TREATMENT