Page 24
Page 25
Scale
In hard water areas it is recommended that an in-line scale inhibitor is fitted. Reducing
the temperature of the stored water will reduce the rate at which scale forms. If the
recovery rate is badly affected, this is an indication that scaling may have occurred.
In this event, follow the procedures as recommended by a reputable Water Treatment
Company.
General
No water at the tap. Check that the mains water supply is turned ON. Check the line
strainer is not blocked. Check that the combination valve has been fitted so that water
is flowing in the correct direction.
If the water at the tap is cold, ensure that the boiler has been switched ON and is
working correctly. Check that there are no air locks in the primary system. ISOLATE
THE UNIT AT THE MAINS ELECTRIC SUPPLY AND THEN CHECK THE FOLLOWING:
i. The cylinder thermostat
ii. The thermal cut-out, which can be re-set by pushing the red button
iii. The motorised valve
iv. The boiler thermostat
v. The boiler thermostat cut-out (if fitted)
ANY ENERGY CUT-OUT MUST NEVER BE BY-PASSED UNDER ANY CIRCUMSTANCES.
If the units are not getting hot and the heat source is electrical, ensure that the
immersion heaters are isolated from the mains before re-setting the energy cut-out.
If the immersion heater(s) need replacing this should be done with the units supplied
from Gledhill Building Products Limited. Same day despatch to approved installers
can be arranged by telephoning 01253 474402.
Discharge From Relief Valves
If cold water is discharging from the expansion relief valve into the tundish check the
pressure on the expansion vessel when cold and recharge if necessary.
If the fault continues and the problem cannot be stopped by operating the easing
control a few times then either the Pressure Reducing Valve or the Relief Valve may
be at fault. If the cold water pressure is too high, this would suggest that the Pressure
Reducing Valve is at fault and the Gledhill approved replacement should be fitted.
If the pressure is correct then the Relief Valve will require replacing with a Gledhill
approved component.
See Commissioning for drain down procedure.
If there is an overheat fault and very hot water is being discharged, turn off the heat
source,
but not the water supply.
When the supply is cool, check thermostats and energy cut-outs in the boiler and
immersion heaters and replace the faulty component with one supplied by Gledhill
and check that it works correctly before returning the system to full operation.
The Registered Installer is responsible for the safe installation and operation of the
system. The installer must also make his customer aware that periodic maintenance
of the equipment is essential for safety.
Maintenance periods will vary for many reasons. Gledhill Building Products Ltd
recommend a maximum of 12 months to coincide with boiler maintenance.
Experience of local water conditions may indicate that more frequent maintenance is
desirable, eg, when water is particularly hard, scale-forming or where the water supply
contains a high proportion of solids, eg, sand. Maintenance must include the following:
1. Check and clean filter
2. Manually check the operation of the temperature relief valve.
3. Manually check the operation of the expansion relief valve.
4. Check discharge pipes from temperature and expansion relief valves are free from
obstruction and blockage and are not passing any water.
5. Check the condition and if necessary descale the heat exchangers in hard water
areas.
6. Check that water pressure downstream of pressure reducing valve is within the
manufacturers limits.
7. Check operation of motorised valve.
8. Check the pressure on the air side of the expansion vessel. This must be done with
the pressure on the water side at zero (gauge pressure).
9.
Check and advise the householder not to place any clothing or other combustible
materials against or on top of this appliance.
10. On completion of the work, fill in the Benchmark Service Record towards the back
of this manual.
After servicing, complete the relevant Service Interval Record section of the Benchmark
Checklist located on the inside back pages of this document.
IMPORTANT NOTE
When draining down the appliance for any reason, the instructions
provided in the Commissioning Section (Page 22) MUST be followed to
prevent potential damage to the cylinder.
SERVICING AND MAINTENANCE
SERVICING AND MAINTENANCE
SERVICING AND MAINTENANCE
FAULT FINDING
