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29
6.10
CHECKING THE FLUE SYSTEM
6.10.1
The flue system should be visually checked for
soundness Check all connections and fixings
are secure and tight
6.11
CHECKING THE HEATING THERMISTOR
6.11.1
Allow the system to warm up and then turn
the C.H thermistor to ensure the main burner
modulates from “high” to “low” and “low” to
“off” and vice versa (scale range
covers approx. 45° C / 85° C).
6.12
TESTING AND REGULATING THE
DOMESTIC HOT WATER SYSTEM FLOW
6.12.1
Put the appliance in summer position with
the (summer/winter) switch (Fig.50).
- Open a domestic hot water tap (preferably
the bath tap). Ensure cold water inlet
stopcock is open and the D.H.W. control
knob (Fig.50) is set at maximum.
- Digital display show water temperature in
demand ( led on)
- If the boiler does not light check that the
water flow rate is above the min. required
to operate the differential pressure 2 8 Lts./
min. (0.61 gals/min).
- The temperature of the water will depend on
the rate at which it flows. If, due to high water
pressure, the flow rate is too high (and thus
the temperature too low for practical use)
the flow rate may be adjusted. It is better to
set for the lowest acceptable temperature,
preferably at the bath tap since the user
can gain higher temperatures at other
restricted flow taps (Table ...)
-If the cold supply is subject to large
fluctuations or is above the permitted max.
water pressure, a suitable pressure/flow
regulator should be fitted in the cold water
supply to the appliance.
- Slowly close the draw off tap to reduce the
flow rate to above the min
(approx. 2.8 litre/min)
- 0.61 gals/min.). Rotate the D.H.W. control
knob to ensure it operates at its various
setting.
- Close the draw-off tap still further. The
burner should stop when the rate falls
below about 2.8 litres/min (0.61 gals/min ).
6.13
HANDING OVER TO THE USER
6.13.1
After completion of installation and
commissioning of the system, the installer
should hand over to the Householder by
taking the following actions:
-
Hand the “User’s Instructions” to
the Householder and explain His/Her
responsibilities under the “Gas Safety
Regulations
2000”.
- Explain and demonstrate the lighting and
shutting down procedures.
- The operation of the boiler including
the use and adjustment of ALL system
controls which should be fully explained
to the Householder. This then ensures the
greatest possible fuel economy consistent
with household requirements of both
heating and hot water consumptions.
Advise the User of the precautions
necessary to prevent damage to the
system, and to the building, in the event
of the system remaining inoperative
during frost conditions
-
Explain the function and the use of the
boiler switch Summer/Winter and
ON/OFF switch,reset and digit display .
- Explain and demonstrate the function of
temperature controls, neon lights radiator
valves etc for the economic use of the
system.
- If an optional time clock is fitted, then
draw attention to the time clock User’s
Instructions and hand them to the
Householder
- Stress importance of regular servicing by
a qualified Heating Engineer and that a
comprehensive service should be carried
out AT LEAST ONCE A YEAR
- Fill in the Benchmark log book and leave
completed with the customer.
SECTION 7
SERVICING INSTRUCTIONS
Ravenheat are a member of the Benchmark initiative
and fully supports the aims of the programme.
Benchmark has instructed to improve the standards
of installation and commissioning of central heating
systems in the UK and to encourage in the regular
servicing of all central heating systems to ensure
safety and efficiency.
Range Rating regulation of Central Heating
Maximum Setting
minimum Setting
C.H. Regulations
Heat Input Fan speed
kW Hz
HE150 HE120 HE 150 HE120
Maximum Setting
32.0
26.0 180 175
minimum Setting
8.3 5.78 53 47
