Bedienungsanleitung Elson Zircon (Seite 15 von 24) (Englisch)

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MAINTENANCE REQUIREMENTS

Unvented hot water systems have a continuing

maintenance requirement in order to ensure safe

working and optimum performance. It is essential

that the relief valve(s) are periodically inspected

and manually opened to ensure no blockage has

occurred in the valves or discharge pipework.

Similarly cleaning of the strainer element and

replacement of the air in the expansion vessel will

help to prevent possible operational faults.

The maintenance checks described below should

be performed by a competent person on a

regular basis, e.g. annually to coincide with boiler

maintenance.

After any maintenance, please complete the relevant

Service Interval Record section of the Benchmark

Checklist on Page 22 of this document.

INSPECTION

The immersion heater boss can be used as an

access for inspecting the cylinder internally.

SAFETY VALVE OPERATION

Manually operate the temperature/pressure relief

valve for a few seconds. Check water is discharged

and that it ows freely through the tundish and

discharge pipework. Check valve reseats correctly

when released. NOTE: Water discharged may be

very hot!

Repeat the above procedure for the Expansion

Relief Valve.

STRAINER

Turn off the cold water supply, boiler and immersion

heaters. The lowest hot water tap should then be

opened to de-pressurise the system. Remove the

pressure reducing cartridge to access the strainer

mesh. Wash any particulate matter from the strainer

under clean water. Re-assemble ensuring the seal

is correctly tted. DO NOT use any other type of

sealant.

DESCALING IMMERSION HEATER(S)

Before removing the immersion heater(s) the unit

must be drained. Ensure the water, electrical supply

and boiler are OFF before draining. Attach a

hosepipe to the drain cock having sufcient length

to take water to a suitable discharge point below the

level of the unit. Open a hot tap close to the unit and

open drain cock to drain unit.

DIRECT UNITS

Switch on electrical supply to the immersion

heater(s) and allow to heat up to normal working

temperature (60ºC recommended, approximately

graduation 4 on the thermostat). If necessary the

temperature can be adjusted by inserting a at

bladed screwdriver in the adjustment knob on top of

the immersion heater thermostat and rotating.

The adjustment range 1 to 5 represents a

temperature range of 12°C to 68°C. Check the

operation of thermostat(s) and that no water

has issued from the expansion relief valve or

temperature/pressure relief valve during the heating

cycle.

INDIRECT UNITS

Open the cover(s) to the immersion heater

housing(s) and disconnect wiring from immersion

heater(s) thermostat(s). Remove thermostat by

carefully pulling outwards. Remove thermostat

capillary sensors from the pockets on the immersion

heater. Unscrew immersion heater backnut(s) and

remove immersion heater from the unit. A key

spanner is supplied with the cylinder unit for easy

removal/tightening of the immersion heater(s). Over

time the immersion heater gasket may become stuck

to the mating surface. To break the seal insert a

round bladed screwdriver into one of the pockets on

the immersion heater and gently lever up and down.

Carefully remove any scale from the surface of the

element(s). DO NOT use a sharp implement as

damage to the element surface could be caused.

Ensure sealing surfaces are clean and seals are

undamaged, if in doubt t a new gasket

(part number 95 611 822).

Replace immersion heater(s) ensuring the lower

(right angled) element hangs vertically downwards

towards the base of the unit. It may be helpful to

support the immersion heater using a round bladed

screwdriver inserted into one of the thermostat

pockets whilst the backnut is tightened. Replace

thermostat capillaries into pocket. Replace the

immersion heater thermostat by carefully plugging

the two male spade terminations on the underside

of the thermostat head into the corresponding

terminations on the element. Rewire, check, close

and secure immersion heater housing cover(s).

EXPANSION VESSEL CHARGE PRESSURE

Remove the dust cap on top of the vessel. Check

the charge pressure using a tyre pressure gauge.

The pressure (with system de-pressurised) should

be 0.35MPa (3.5 bar). If it is lower than the required

setting it should be re-charged using a tyre pump

(Schrader valve type). DO NOT OVER-CHARGE.

Re-check the pressure and when correct replace the

dust cap.

RE-COMMISSIONING

Check all electrical and plumbing connections are

secure. Close the drain cock. With a hot tap open,

turn on the cold water supply and allow unit to

rell. DO NOT switch on the immersion heater(s)

or boiler until the unit is full. When water ows

from the hot tap allow to ow for a short while to

purge air and ush through any disturbed particles.

Close hot tap and then open successive hot taps in

system to purge any air. When completely full and

purged check system for leaks. The heating source

(immersion heater(s) or boiler) can then be switched

on.

MAINTENANCE

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