27
Benchmark™
On completion of any maintenance or service of the Andrews water heater, the Benchmark
TM
“Installation, Commissioning
and Service Record”, Pages 36 & 37, 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 head work from valve body.
`
Clean valve seat face and seating – do not scratch damage either seal face or seating.
`
Refit in reverse order. Do not over tighten.
Warnings
IF WATER DISCHARGES FROM THE TEMPERATURE / PRESSURE RELIEF VALVE ON THE ANDREWS WATER HEATER
UNIT REFER TO FAULT FINDING TABLE FIRST FOR GUIDANCE. IF THIS DOES NOT RECTIFY THE FAULT SWITCH OFF
ELECTRICAL SUPPLY TO THE AUXILIARY 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 ANDREWS WATER HEATER SYSTEM, IF A
FAULT IS SUSPECTED CONTACT A COMPETENT INSTALLER.
