Supplied By www.heating spares.co Tel. 0161 620 6677
8
10
AL
TERNATIVE METHODS OF FILLING A SEALED SYSTEM
•
MAINS W
ATER
SUPPLY
•
•
•
DOUBLE
CHECK
VALVE
ASSEMBLY
•
STOP
VALVE
•
STOP
VALVE
•
HEA
TING SYSTEM
RETURN
•
CISTERN &
OVERFLOW
•
MAINS
WATER SUPPLY
•
PRESSURE PUMP
& REDUCING VALVE
IF REQUIRED
•
STOP
VALVE
•
HEA
TING
SYSTEM
RETURN
FLEXIBLE HOSE UNION
TEMPORARY CONNECTION
To be removed immediately after filling
RECOMMENDED AND APPROVED METHOD FOR
FILLING A CLOSED CIRCUIT IN A HOUSE.
(R24-2a WATER REGULATIONS GUIDE)
Note:
The appliance has a built in
filling loop
METHOD B
EXP
ANSION VESSEL
The table below shows 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 expansion 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.
PRESSURE GAUGE
A pr
essure gauge is situated on the
appliance control panel. This can be viewed by lowering the
bottom front panel.
PRESSURE RELIEF V
ALVE
A pr
essure relief valve set at 3 bar
(43.5 psi) is supplied with the appliance.
a)
Check that the mains water pr
essure is sufficient (as stated in 2.4
“General Specification”) to produce the required DHW flow rate,
but does not exceed the maximum DHW pressure (10 bar). If
necessary, a pressure reducing valve must be fitted to the mains
supply before the DHW inlet connection.
b)
The final 600mm (24in) of the mains supply pipe to the boiler
must be copper.
c)
A
void long DHW pipe runs and several hot water draw off points
d)
Insulate the Hot water pipes if accessible to minimise the heat
losses within the pipes to keep the water hot longer.
e)
A domestic hot water r
egulator is fitted within the group set to
control the maximum water flow rate. This may be removed to
3.7
DOMESTIC HOT WATER SYSTEM
EXP
ANSION VESSEL REQUIREMENTS
V
essel charge and initial
system pressure
Total water content of system
using 8ltr. (1.54gal) capacity expansion
vessel supplied with appliance
For systems having a larger
capacity multiply the total system capacity
in litres (gallons) by the factor to obtain the
total minimum expansion vessel capacity required litres (gallons)
bar
0.5
0.75
1.0
1.5
psi
7.3
11
14.5
21.8
96ltr
84ltr
73ltr
50ltr
21gal
18gal
16gal
11gal
0.0833 0.093 0.109 0.156
obtain higher flow rates. Higher flow rates will not damage
the appliance but may reduce the water temperature below an
acceptable level.
f)
If the appliance is installed in an ar
ea where the temporary
hardness of the water supply is high, say over 150ppm, the
fitting of an in-line scale inhibitor may be an advantage.
Consult the Local Water Supplier if in doubt.
g)
For specific infor
mation relating to fittings (eg. Showers,
Washing Machines etc) suitable for connection in the DHW
circuit, consult the Local Water Supplier. However the
following information is given for guidance:
DOMESTIC HOT/COLD W
ATER SUPPLY TAPS AND
MIXING TAPS.
All equipment designed for use at mains
water pressure is suitable.
SHOWERS & BIDETS
. Any mains pr
essure shower or bidet
complying with the Local Water Undertaking bylaws is suitable.
h)
Consider IRN 116 and Byelaw 90 + 91. Ensur
e that necessary
action have been carried out to account for thermal expansion of
water. If thermal expansion is not provided then high water
pressure may result in damaging to fittings and devices.
a)
W
iring external to the appliance must be in accordance with
the current l.E.E. Wiring Regulations (BS 7671) for electrical
installation and any local regulations which apply.
b)
The mains cable must be at least 0.75mm
2
(24/0.2mm)
PVC Insulated to BS6500 table 16.
c)
THIS APPLIANCE MUST BE EARTHED.
(Failur
e to provide
a satisfactory Earth connection will result in appliance
malfunction)
d)
The method of connection to the mains supply must facilitate
complete electrical isolation of the appliance. Either a 3A
Fused three pin plug and unswitched shuttered socket outlet,
both complying with BS1363, or a 3A fused double pole
switch having a 3mm contact separation in both poles and
serving only the boiler (and its external controls) may be used.
The appliance may be used with any certificated mains voltage
room thermostat as described in section 4.
3.9
EXTERNAL CONTROLS
3.8
ELECTRICITY SUPPLY
