COMMISSIONING SERVICING
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 3 bar (45PSI). The valve is of the car tyre
(Schrader) type.
The hot tap furthest away from the AquaFlo should be opened
before filling the system to let air out. The system should be flushed
before use. The remaining taps should be opened in turn to expel air.
DIRECT UNITS
The system must be fully filled and flushed 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 filling position and
use the boiler manufacturers commissioning instructions to fill 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 AquaFlos. 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 final 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 identified and rectified. 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 flow
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 reseat 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 efficient 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 DRAINED OFF MAY BE VERY HOT!
ANNUAL SERVICING
A competent installer should carry out the following checks on an
annual basis, ideally at the same time as the annual boiler service.
1) The expansion relief valve on the inlet control set should be eased
open allowing water to flow for 5 seconds. The valve should then
be closed making sure it re-seats correctly. Repeat this
procedure with the pressure/temperature relief valve. Always
ensure that the discharge pipework is allowing the water to drain
away adequately. If not check for blockages etc. and clear.
WARNING: THE WATER DISCHARGED MAY BE VERY HOT!
2) Ensure that any immersion heaters that are fitted are working
correctly and that they are controlling the water at a temperature
of between 55°C and 65°C.
3) Make sure the pressure in the expansion vessel is charged to 3
bar. Turn off the water supply to the unit and open a hot tap first.
The valve on the expansion vessel is a Schrader (standard car
tyre) type. Air or CO2 can be used to repressurise the expansion
vessel.
4) Remove the head on the inlet control set by unscrewing, and
clean the mesh filter within.
YOUR WARRANTY MAY BE VOID WITHOUT PROOF OF
ANNUAL SERVICING.
