Technical data

AquaFlo Installation, Maintenance and User Instructions Page 22 of 24 V 2.01 - October / 2012
COMMISSIONING
Filling
Check all connections for water tightness including any factory made connections such as the
immersion heater and the temperature and pressure relief valve.
The pressure in the expansion vessel should be checked to ensure it is 0.3 MPa (3 bar) (45
psi). The valve is of the car tyre (Schrader) type.
The hot tap furthest away from the AquaFlo should be opened before lling the system to let
air out. The system should be ushed before use. The remaining taps should be opened in turn
to expel air.
Direct units
The system must be fully lled and ushed before switching on the power to the immersion
heaters and allowing the unit to heat up. The immersion heater is supplied preset at 55°C.
Turning fully to + sets to approx 65°C.
Indirect units
Ensure the lever on the two port valve is set to the lling position and use the boiler
manufacturers commissioning instructions to ll the primary circuit. When full release the lever.
Switch the programmer to Domestic Hot water (DHW) and allow the unit to start to heat. Adjust
the dial of the dual thermostat to between 55°C and 65°C as required.
Storage temperature
A storage temperature of 60-65°C is normal for both direct and indirect AquaFlo. In hard
water areas consideration should be given to reducing this to 55-60°C. In many healthcare
applications the guidance on Legionella control and safe water delivery temperatures will
require storing the water at 60-65°C, distributing at 50-55°C and using thermostatic mixing
valves to control the nal temperature.
For details consult the NHS estates guidance on safe hot water temperatures.
Safety valve checks
Any water coming from either the expansion relief valve or the temperature / pressure relief
valve during heat up is indicative of a problem which needs to be identied and rectied. The
temperature relief and expansion relief valves should be fully opened, one at a time then both
together allowing as much water as possible to ow through the tundish. Check that your
discharge pipework is free from debris and is carrying the water away without spillage over
the tundish and release the valves and check that they re-seat properly.
General
Servicing should only be carried out by competent installers and any spare parts used must
be purchased from Zip Heaters. NEVER bypass any safety devices or operate the unit without
them fully operational.
Draining
Isolate from the electrical supply to prevent the immersion heaters burning out. Isolate the
unit from the cold mains. Attach a hose to the draining tap ensuring it reaches to a level below
the unit. (This will ensure an efcient syphon is set up and the maximum amount of water is
drained from the unit). Open the hot tap closest to the unit and open the draining tap.
WARNING: WATER BEING DRAINED OFF MAY BE VERY HOT!