gledhill PLATINUM D120, Instruction Manual

Page: 21 / 52

Page 21
Your Platinum unvented cylinder is automatic in normal use, but requires routine
maintenance which is normally carried out at least annually along with the boiler
service. The maintenance must be carried out by a suitably competent tradesperson
who is qualified to work on unvented cylinders. The checks/work needed are listed
in the maintenance part of these Instructions.
For the control thermostat set points of the immersion heaters for direct heating
of our cylinders, please refer to page 16 of this manual. The control thermostat for
indirect heat exchanger heat up of our cylinders are usually set at between 60°C - 65°C.
During commissioning the actual temperature that the cylinder reaches when the
thermostat(s) operate should be tested and adjusted so that it achieves a minimum
of 60°C, in order to comply with the Legionella pasteurisation requirements.
When initially opening the taps, a small surge in flow may be experienced, which
disappears as the pressure in the system stabilises. This is quite normal with these
types of systems and does not indicate a fault.
In some areas the water will initially appear cloudy, but will quickly clear when left
to stand. This is nothing to be concerned about and is due to aeration of the water.
WARNING
- If water is seen flowing through the tundish, this indicates a fault condition
which needs action.
If the discharge is hot and continuous, turn the boiler and/or the immersion heaters
off, but do not turn off the cold water to the appliance until the discharge is cold.
Note:
The discharge may stop by itself as the discharge cools.
If the discharge is cold and intermittent, no immediate action is needed but this
indicates depletion of the internal expansion air volume or the air charge of any
additional secondary expansion vessel (if fitted).
However, in both cases you must call the registered installer / a suitably qualified,
competent tradesperson, advise them that you have an unvented cylinder and
request a maintenance visit.
DO NOT,
at any time, tamper in any way with the safety valves or overheat thermostats/
wiring.
Expansion volume re-charge
The air volume within the Platinum cylinder will periodically require recharging
to ensure expanded water is accommodated within the unit. A discharge of water
intermittently from the expansion valve will indicate the air volume has reduced to a
point where it can no longer accommodate the expansion.
To recharge the air volume:
• Turn off the heat source to the cylinder (boiler or immersion heater)
• Turn off the cold mains water supply to the unit.
• Open the lowest hot tap supplied by the Platinum cylinder.
• Hold open the temperature & pressure relief valve by lifting the lever on top of the
valve until water ceases to run from the lowest hot tap and gurgling noise at the
valve stops.
• Close the temperature & pressure relief valve by releasing the lever.
• Check the pressure of any additional secondary expansion vessel (if fitted) at this
stage.
• Turn on the mains cold water supply. When water flows from the lowest hot tap,
close the tap.
• The air volume will be automatically recharged as the unit refills.
• If after following this procedure water still discharges from the expansion valve
further advice should be sought from a competent installer or Gledhill Technical
on 01253 474584.
USER INSTRUCTIONS
USER INSTRUCTIONS