MEGAFLO Commercial 1000, Product Manual, Page: 26 / 40

Unvented Hot Water Cylinder
26
MAINTENANCE AND
SER
VICING (3)
Warnings
IF WATER DISCHARGES FROM THE TEMPERATURE / PRESSURE RELIEF VALVE ON THE Megaflo
COMMERCIAL UNIT REFER TO FAULT FINDING TABLE FIRST FOR GUIDANCE. IF THIS DOES
NOT RECTIFY THE FAULT SWITCH OFF ELECTRICAL SUPPLY TO THE AUXILLARY IMMERSION
HEATER(S) AND SHUT DOWN THE BOILER . DO NOT TURN OFF THE WATER SUPPLY. CONTACT
A COMPETENT INSTALLER FOR UNVENTED WATER HEATERS TO CHECK THE SYSTEM.
DO NOT TAMPER WITH ANY OF THE SAFETY VALVES FITTED TO THE Megaflo COMMERCIAL
SYSTEM, IF A FAULT IS SUSPECTED CONTACT A COMPETENT INSTALLER.
Benchmark
TM
On completion of any maintenance or service of the Megaflo Commercial , the Benchmark
TM
“Installation,
Commissioning and Service Record”, Pages 33 & 34, should be filled in to record the actions taken and
the date the work was undertaken.
Maintenance
Under normal circumstances the control valves should not require any maintenance. However, annual
inspection and/or cleaning of the integral strainer , pressure reducing valve cartridge, expansion
relief valve cartridge and seating may be necessary depending on local water conditions.
Pressure reducing valve
Isolate cold water supply and drain system if necessary
Unscrew the retaining nut of the valve. The complete operating mechanism, including the strainer
can be removed. Clean the filter mesh and cartridge ensuring that the strainer is correctly located
and reassemble the unit.
Expansion Valve
Isolate cold water supply
Unscrew expansion relief cartridge from body and clean the filter mesh and cartridge.
Clean valve seat face and seating – do not scratch or damage either seal face or seating,
Refit in reverse order. Do not over tighten.