Manual Elson Zircon (page 5 of 24) (English)

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PIPE FITTINGS

All pipe ttings are made via 22mm compression

ttings directly to the unit. The ttings are threaded

3/4”BSP male parallel, should threaded pipe

connections be required.

COLD FEED

A 22mm cold water supply is recommended, however,

if a 15mm (1/2”) supply exists, which provides sufcient

ow, this may be used (although more ow noise

may be experienced).

A stopcock or servicing valve should be incorporated

into the cold water supply to enable the cylinder and

its associated controls to be isolated and serviced.

COLD WATER COMBINATION VALVE ASSEMBLY

The 2-piece cold water combination valve assembly

(see Fig. 2) can be located anywhere on the cold

water mains supply prior to the expansion vessel

(see Fig. 6 Page 10) but the two pieces do not have

to be installed together.

The pressure reducing valve incorporates the

pressure reducer and strainer and the expansion valve

incorporates the expansion and check valves. Ensure

that the valves are installed in the correct order

and orientation. No other valves should be placed

between the expansion valve and the cylinder. A

connection can be made between the expansion and

pressure reducing valves to provide a balanced cold

water connection. The expansion valve connection

must not be used for any other purpose.

DRAIN TAP

A suitable draining tap should be installed in the cold

water supply to the cylinder between the expansion

valve (see Fig. 6 Page 10) and the heater at as low a

level as possible. It is recommended that the outlet

point of the drain pipework be at least 1 metre below

the level of the heater (this can be achieved by

attaching a hose to the drain tap outlet spigot).

EXPANSION VESSEL

The expansion vessel accommodates expansion

that results from heating the water inside the unit.

The expansion vessel is pre-charged at 0.35MPa

(3.5 bar). The expansion vessel must be connected

between the expansion valve and the cylinder (see

Fig. 6 Page 10). The location of the expansion

vessel should allow access to recharge the pressure

as and when necessary, this can be done using

a normal car foot pump. It is recommended that

the expansion vessel is adequately supported. An

expansion vessel wall mounting bracket is supplied

for this purpose and should be tted.

SECONDARY CIRCULATION

If secondary circulation is required it is recommended

that it be connected to the cylinder as shown (see

Fig. 3 page 5) via a swept tee joint into the cold

feed to the unit. A swept tee joint is available as an

accessory (order code no. 5133565).

The secondary return pipe should be in 15mm pipe

and incorporate a check valve to prevent backow.

A suitable WRAS approved bronze circulation

pump will be required. On large systems, due to

the increase in system water content, it may be

necessary to t an additional expansion vessel to the

secondary circuit. This should be done if the capacity

of the secondary circuit exceeds 10 litres.

Pipe capacity (copper):

15mm O.D. = 0.13 l/m (10 litres = 77m)

22mm O.D. = 0.38 l/m (10 litres = 26m)

28mm O.D. = 0.55 l/m (10 litres = 18m)

NOTE: Secondary circulation is NOT recommended for

direct electric units.

OUTLET

The hot water outlet is a 22mm compression tting

located at the top of the cylinder. Hot water distribution

pipework should be 22mm pipe with short runs of

15mm pipe to terminal ttings such as sinks and

basins. Pipe sizes may vary due to system design.

INSTALLATION GENERAL

Fig. 2: Cold water combination valve assembly

Fig. 3: Secondary circulation connection

Hi. My cylinder is getting too hot. Boiler continues to run for hot water when programmer is off for heating and hot water. Diverter valve is working so what else could be causing this? Submitted on 14-1-2023 at 11:28
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Elson Zircon Manual

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