11
COMMISSIONING INSTRUCTIONS
BEFORE FILLING, CHECK EXPANSION VESSEL CHARGE IS AT 3.0 BAR.
1. Open all terminal fittings on the domestic hot water circuit. Open the main supply to the unit.
2. Flush through until all air is expelled.
3. Close hot outlets and open all cold outlets connected to the tee after the pressure control valve.
4. Flush through until all air is expelled.
5. The system is now full of water. Check for any leaks on pipework or joints or components such
as immersion heaters etc. It is the responsibility of the installer to check all fittings, including
those that are fitted to the unit.
6. Switch on power and heat up via immersion heater, and/or boiler.
7. Your system should be ready for use.
MAINTENANCE
Maintain annually and carry out the following checks:
Clearly up date the Benchmark Log Book at each service -
GUARANTEES ARE VOID WITHOUT SERVICE RECORDS.
1. Check incoming pressure is controlled at 3 bar maximum. The gauge reading clearly demonstrates this.
Expansion vessels must be maintained annually. The charge should be checked with an accurate
pressure gauge and maintained at 3.0 bar. If the reading is less than 3.0 bar to recharge the vessel
ensure that the unit is decommissioned by turning off the water supply and opening hot tap. Open
the pressure and temperature relief valve to drain water from the top of the unit then close this valve.
Leaving the hot tap open and the main supply off, pump the vessel using a schraeder valve connector
via a footpump or motorised pump to 3.0 bar. Remove pump, open mains supply and close hot tap
once water is running freely.
Run a hot tap and close. If the pressure remains over 3 bar, re-calibrate the Pressure Reducing Valve
and clean the strainer, replacing if necessary.
2. Open the expansion valve cap to manually discharge water to ensure that it works, making sure that
it resets correctly.
3. Open the pressure and temperature relief valve cap to manually discharge water to ensure that it works,
making sure that it resets correctly.
4. In both cases ensure that discharge pipework is adequate to safely carry discharged water away.
If not, check for blockages etc. and clear.
5. Check that the controls of the hot water temperature do not allow the water to get hotter than 60ºc.
New Stainless imp_alt 2/15/05 12:15 PM Page 12
