25
Commissioning
Filling and flushing the Andrews water heater
Ensure that all fittings and immersion heaters are correctly fitted and tightened.
`
Open a hot tap furthest from the cylinder.
`
Open the isolating valve (if fitted in this position). Open the mains stop cock to fill the unit. When water issues from
the tap, allow to run for a few minutes to thoroughly flush through any residue, dirt or swarf, then close tap.
`
Open successive hot taps to purge any air from the system.
`
Check all connections for leaks and rectify as necessary.
`
The strainer housed within the pressure reducing valve should be cleaned to remove any debris that may have been
flushed through the main supply pipe.
Check the operation of the safety valves
`
Slowly, manually open for a few seconds, the temperature and pressure relief valve (T&P valve) situated on the
Andrews water heater. Check water discharged runs freely away through the tundish and discharge pipework. Close
valve, ensure water flow stops and valve reseats correctly.
`
Repeat for the pressure relief valve.
NOTE: The water discharged may be very hot.
Auxiliary Immersions
Switch on the electrical supply to the immersion heater(s) and allow the unit to heat up. Check that the thermostat
operates correctly. A storage temperature of approx. 60ºC is recommended. Check that no water is discharged from
either the expansion valve or temperature and pressure relief valve during the heating cycle.
Primary circuit
Fill the indirect (primary) circuit following the boiler manufacturer’s commissioning instructions. To ensure the primary
heating coil in the cylinder is filled the 2-port motorised valve (supplied) should be manually opened by moving the lever
on the motor housing to the MAN OPEN position. When the primary circuit is full return the lever to the AUTO position.
Vent any trapped air by opening the air bleed.
Benchmark™ log book (where required)
On completion of the installation and commissioning procedures detailed in this product guide the BenchmarkTM
“Installation, Commissioning and Service Record Log” should be completed and signed off by the competent installer
or commissioning engineer in the relevant sections. The various system features, location of system controls, user
instructions and what to do in the event of a system failure should be explained to the customer. The customer should
then countersign the Benchmark™ commissioning checklist to accept completion. The service record should be filled in
when any subsequent service or maintenance operation is carried out on the Andrews water heater.
