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2.9.1

Pump

The available head shown in fig. 4 is that in excess of the appli-
ance hydraulic resistance, i.e. that available for the system at
any given heating load up to the maximum output in C.H.
mode. Never reduce the pump speed below maximum as this
will reduce D.H.W. output. The pump speed is indicated on the
side of the pump speed selector switch (if fitted).

2.9.2

System volume (total water content)

The following Table gives the maximum system volume that
the integral expansion vessel can sustain under different
charge pressure conditions.
If the system volume exceeds that shown, an additional expan-
sion vessel must be fitted and connected to the heating system
primary return pipe as close as possible to the appliance.
If an extra vessel is required, ensure that the total capacity of
both vessels is adequate. Further details are available in the
current issues of BS5449 and BS6798.

NOTE: If the pressure gauge indicates 2.65 bar or greater
when the appliance is at maximum temperature with all
radiators in circulation an extra expansion vessel is
required.

2.9.3

Pressure gauge

A pressure gauge is mounted on the appliance facia panel.

2.9.4

Safety valve

A safety valve set at 3 bar (43.5 psi) is fitted to the appliance
and  a  discharge  pipe  is  routed  to  outside  of  the  appliance.
This  discharge  pipe  should  be  extended  to  terminate  safely
away  from  the  appliance  and  where  a  discharge  would  not

cause damage to persons or property but would be detected.
The pipe should be able to withstand boiling water, be a mini-
mum of 15 mm in diameter, and not include any horizontal
runs prone to freezing.

2.10

D.H.W. SYSTEMS

– The authority of the local Water Company should be

obtained before the appliance is connected to the cold
water mains supply. Check that the mains supply pres-
sure is within the prescribed limits (

Table 4).

If necessary, a pressure reducing valve should be fitted to
the mains supply before the D.H.W. inlet connection.

– The final 600 mm (24 in) of the mains supply pipe to the

boiler must be copper.

– A maximum D.H.W. flow rate of: 10.3 l/m (2.3 gpm) for

“FORMAT 80 C”

, 13 l/m (2.9 gpm) for

“FORMAT 100 C”

is recommended. Higher flow rates will not damage the
appliance but may lower the water temperature below an
acceptable level.

– If the appliance is installed in an area where the tempo-

rary  hardness  of  the  water  supply  is  high,  say  over  150
ppm,  the  fitting  of  an  in  line  scale  inhibitor  may  be  an
advantage.  Consult  the  Local  Water  Undertaking  if  in
doubt.

– Devices capable of preventing the flow of expansion water:

e.g. non return valves and/or loose-jumpered stop cocks
should not be fitted unless separate arrangements are
made for expansion water.

– For specific information relating to fittings (eg. Showers,

washing machines etc.) suitable for connection in the
D.H.W. circuit, consult the Local Water Undertaking, how-
ever the following information is given for guidance.

2.10.1 Domestic hot/cold water supply

taps and mixing taps

All equipment designed for use at mains water pressure is
suitable.

2.10.2 Showers

Any mains pressure shower is suitable, but if the unit has a
loose head which may become immersed in bath water either
an anti-syphonage device must be fitted, or the length of the
flexible hose must be reduced so that it cannot fall closer than
13 mm (1/2 in) to the top of the bath.

2.10.3 Bidets

Providing that the appliance is of the over-rim flushing type, the
outlets are shrouded and it is impossible to attach a temporary
hand held spray, no anti syphonage device is necessary.

Vessel charge and initial system

pressure

Total water content of system

using 6 l (1.32 gal) capacity expan-

sion vessel supplied with appliance

(

“FORMAT 80 C”

)

Total water content of system

using 8 l (1.76 gal) capacity expan-

sion vessel supplied with appliance

(