© MHG Heating Ltd
9
MHG Heating Ltd, Unit 4 Epsom Downs Metro Centre, Waterfield, Tadworth, Surrey, KT20 5LR
Phone 0845 6448802 Telephone. 0845 6448803 Fax. Email
Website www.mhgheating.co.uk
010313
Draft
NB: If the secondary circulation system (where used) contains more than 15 litres of water a separate expansion
vessel must be provided to compensate for the larger stored volume.
Make electrical connections to the immersion heaters – see wiring diagram inside cap of immersion heater. All electrical
installations must be to IEEE standards.
The immersion heaters supplied with the cylinder are of a special construction and include both a control thermostat and overheat protection.
When fitting, ensure the ‘O’ ring is positioned correctly on the head of the immersion heater and lubricate before fitting.
Fit it by hand until almost home then tighten gently as the ‘O’ rings will seal easily.
Only use genuine replacement parts which can be obtained from a MHG Water Heaters approved merchant.
Ensure that the immersion heater control setting is set between 55°C and 65°C for economical operation.
T
he upper limit thermostat is set to 80
o
C and must not be tampered with.
Commissioning & Operating
Ensure all connections are fully tightened.
Open all of the hot taps supplied by the cylinder and slowly fill the unit by opening the service valve.
Continue to fill the unit until water runs continuously from all of the open taps. Open the service valve fully, and close all hot taps.
Check for leaks.
Heat the water to 60
o
C. When up to temperature, the cylinder should be isolated and drained to flush out any flux/solder introduced during the
installation process. The filter in the inlet control set should be removed, cleaned and re-fitted - see photograph
Reheat the cylinder to desired temperature and recheck for leaks.
For safety and energy saving reasons it is advisable to operate the cylinder at a temperature between 55°C and 60°C.
Place this instruction book in a convenient place for the end user. Complete the Service Record Log Book and leave with the cylinder.
Complete the guarantee card and post it.
We recommend the installation of a gate valve between the boiler flow and return pipes immediately before the energy cut out valve
to balance the primary flow.
