COMMISSIONING - FILLING THE SYSTEM
Check all connections for water tightness including factory made connections, as these may become loose
in transit. The expansion vessel should be 3 bar (45PSI).
The hot tap furthest away from the cylinder should be opened before filling the system to purge air and
flush any disturbed particles.
The pipes should be flushed before use. The remaining taps should be opened in turn to purge air from the
system before turning on the electrical supply.
11
SAFETY VALVE CHECKS
A problem is occurring if water is released from either safety valve during the heat up process (temperature
relief and expansion relief.) This must be rectified before continuing. Both valves should be opened slowly
one at a time, and then together, allowing as much water as possible through the tundish. Check that the
discharge pipework is cleared of obstruction, free flowing, and without spillage over the tundish. Check that
the valves reseat correctly when released.
DRAINING PROCESS
Isolate the unit from the electric supply to prevent immersion heater burn out. Isolate the unit from the
cold mains. Attach a hose to the draining tap. Ensure this reaches to a level below the unit for creating an
effective siphon so that the maximum amount of water is drained from the unit. Open the hot tap closest to
the unit and open the draining tap.
Caution: Water drained off may be hot.
SERVICE AND MAINTENANCE
• Servicing must be carried out annually by competent installers.
• Any spares used must be purchased from UK Cylinders.
• Safety devices must not be bypassed. Do not use the unit if safety features are not
fully operational.
• Proof of annual servicing is required to avoid invalidating your manufacturer’s
guarantee.
• Upon installation of the unit the installer must complete the accompanying
commissioning certificate at the rear of this manual.
ANNUAL SERVICING PROCESS
This must be conducted by a competent installer on an annual basis, ideally at the same time as the annual
boiler service:
1. The expansion relief valve should be eased open to allow water to flow for a minimum of 5 seconds. Close
the valve and make sure it resets correctly. Repeat this procedure with the temperature & pressure relief
valve. Ensure that the discharge pipework is cleared and allowing a free flow of discharge.
2. Ensure all fitted immersion heaters are working correctly. They should be controlling the water
temperature between 55°C and 60°C.
3. Make sure the pressure in the expansion vessel is set to 3 bar. This is done by turning off the water supply
to the unit and opening a hot tap first. Air or CO2 can be used for repressuring the expansion vessel.
4. Remove the head on the inlet control set and clean the mesh filter within.
5. Update the benchmark service record supplied after every service by the installer.
DISCHARGE AT THE TUNDISH
IF WATER IS FLOWING THROUGH THE TUNDISH THIS INDICATES DISCHARGE FROM ONE OF THE
SAFETY VALVES AND INDICATES A FAULT IN THE SYSTEM. CONTACT A COMPETENT PLUMBER OUT TO
SERVICE OR DIAGNOSE THE SYSTEM.
