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SERVICING
GENERAL
Servicing should only be carried out by competent installers and only spare parts
approved by the manufacturer may be used. Never bypass any of the safety devices
and never operate the unit without all of the safety devices being in place and fully
operational.
DRAINING
Isolate from the electrical supply to prevent the immersion heaters burning out. Turn
off the boiler. Isolate the unit from the cold mains. Attach a hose to the draining tap
ensuring that 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). First open the hot
tap closest to the unit and then open the draining tap.
Warning: water drained off may be very hot!
Important: After draining the cylinder do not close the hot tap until the cylinder has
fully cooled, failure to follow this instruction may result in damage to the cylinder and
will invalidate the guarantee.
ANNUAL MAINTENANCE
The unvented cylinder requires an annual service in order to ensure safe working and
optimum performance and to maintain the guarantee. It is essential that the following
checks are performed by a competent installer on an annual basis. Commonly this is
done at the same time as the annual boiler service.
Table 6: Fault finding
Fault
Water escaping from the case
Cold water at hot taps
Water discharges from expansion relief valve
Water discharges from temperature &
pressure relief valve
Milky / cloudy water
No hot water flow
Noise during hot water draw-off -typically
worse in the morning
Hot or warm water from cold tap
Possible Cause
Compression fitting on hot draw-off not sealing
Leaking cylinder
Indirect - boiler not working
Indirect - motorised valve fault
Indirect - cut-out in dual stat has operated
If continual - pressure reducing valve (part of inlet control set) may not be
operating correctly
If continual - expansion relief valve seat may be damaged
If intermittent - expansion vessel charge may have reduced / bladder perished
Unit is being back pressurised
Unit has overheated - thermal controls have failed
Oxygenated water
Cold mains off
Strainer blocked in pressure reducing valve
Inlet control set may be fitted incorrectly
Loose pipework
Water hammer
If tap runs cold after a minute or so the pipe is picking up heat from heating
pipework
1) Twist the cap of the expansion relief valve on the inlet control set and allow water
to flow for 5 seconds. Release and make sure it reseats correctly. Repeat with the
temperature & pressure relief valve. In both cases check that the discharge pipework is
carrying the water away adequately. If not, check for blockages etc. and clear.
Warning: the water discharged may be very hot!
2) Check that any immersion heaters fitted are working correctly and that they are
controlling the water at a temperature between 55ºC and 65ºC.
3) Check 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 air valve on expansion vessel is a
Schrader (car tyre) type. Air, nitrogen or CO
vessel.
4) Unscrew the head on the inlet control set and clean the mesh filter within (some water
may escape).
5) The Service Record on page 22 of this manual must be updated at each service.
Your guarantee may be void without proof of annual servicing.
Solution
Check/remake joint with sealing paste
Isolate supply and contact us
Check boiler - consult boiler manufacturer's instructions
Check plumbing / wiring to motorised valve
Reset and investigate cause
Check outlet pressure from inlet control set is 3 bar
Remove cartridge - check seat and renew if necessary
Check pressure in expansion vessel. Recharge to 3 bar if necessary. If bladder
perished replace vessel
With cylinder cold check pressure in cylinder. If this is the same as the incoming
mains pressure then you are getting backfeed. Install a balanced cold supply
page
5)
Switch off power to boiler and immersion heaters.
Leave water supply on. Wait until discharge stops.
Isolate water supply and replace if faulty
Water from any pressurised system will release oxygen bubbles when flowing. The
bubbles will settle out
Check and open stopcock
Isolate water supply and clean
Check and refit as required
Install extra clips
Fit a shock arrestor
Insulate / re-route
Green Storage WB Range
Installation & Maintenance Instructions
may be used to charge the expansion
2
(see
19
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