Page 36
3.0 SERVICING
SCALE
In hard water areas, above 200ppm (mg/l) 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
All work must be carried out by a suitably qualified/competent person.
No hot water at the taps
Check that the mains water supply is turned ON. Check the line strainer in the
combination inlet valve 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/immersion heater(s) have been switched ON and are working
correctly.
Note
: in the case of the direct units check the hot water controller/off
peak supply 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 the boiler is for any reason unable to supply heat to the appliance, hot water can
be obtained by operating the rocker switch on the front of the appliance to switch
on the immersion heater.
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 unit supplied
from Gledhill Water Storage Ltd. Same day despatch to approved installers can be
arranged by telephoning 01253 474444.
12.25
Programmer
Immersion heater selected -----
Boiler energy cut-out trip ------
High limit safety trip ------
Immersion heater ---------
Normal (Boiler) ---------
Neon
Neon
Neon
Rocker
Switch
3.4 fAULT fINDING
DISCHARGE fROM RELIEf VALVES
If cold water is discharging from the expansion
relief valve drop the system pressure and check
the air pressure in the expansion vessel is 1.5
bar.
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/cartridge will require replacing
with a Gledhill approved component.
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 system is
cool, check thermostats and energy cut-outs in
the boiler and immersion heaters and replace
the faulty component with a unit supplied by
Gledhill and check that it works correctly before
returning the system to full operation.
Note
: The controls on the front of the indirect
unit (see below) will indicate the operating
condition of the appliance and whether either
of the two safety thermostats have tripped.
