Glow-worm hxi and Gas Valve - Manual (Page 30)

30 0020008153-05
10 Commissioning
10.5 Testing - Gas (Natural Gas only)
Case Off Case On
Burner CO
2
(G20) 9.1+0.2-0.5 9.3+0.3-0.5
Burner CO
2
Propane (G31) 10.5+0.3-0.7 10.7+0.3-0.8
Should any doubt exist about the gas rate, check it using the
gas meter test dial and stop watch at least 10 minutes after
the burner has lit, making sure that all other gas burning
appliances and pilot lights are off.
The approximate gas rates: 12hxi : 1.29m 3 /h (45.6ft 3 /h)
15hxi : 1.61m 3 /h (57ft 3 /h)
18hxi : 2.0m 3 /h (70.6ft 3 /h)
24hxi : 2.57m 3 /h (90.8ft 3 /h)
30hxi : 3.02m 3 /h (107ft 3 /h)
38hxi : 4.06m 3 /h (143ft 3 /h)
The gas valve is factory set for natural gas (G20) and should
need no adjustment. (LPG (G31) should be adjusted as described
on page 27, LPG CONVERSION). It should be checked that the
supply pressure is 20mb when the boiler is firing at full rate. This
can be achieved by checking the inlet pressure at the pressure
test point on the gas valve shown in diagram 10.3.
Disconnect pressure gauge.
Note that the burner pressure cannot be measured at the gas
valve as it is altered by the suction of the fan and modulated
according to demand.
Replace inner casing panel and casing panel, see diagram
10.1.
10.6 Testing - Heating System
Check that all remote controls are calling for heat. The boiler will
fire automatically. Fully open all radiator valves, flow control
valve ‘A’ and bypass valve ‘B’, see diagram 4.3.
Balance the radiators as required and if fitted adjust valve ‘A’ to
give the required system differential. Turn off all radiators that
can be shut off by the user and check to see if less than the
maximum differential allowed of 20
0 C can be achieved across
flow and return.
Allow the system to reach maximum temperature then switch
off the boiler by isolating from the electrical supply.
Drain the entire system rapidly whilst hot, using the drain tap at
the lowest part of the system. Fill and vent the system as
described previously in section 10.2
Lock or remove the handle from control valve ‘A’ to prevent
unauthorised adjustment.
10.7 Completion
Adjust the boiler temperature control and any system controls
to their required settings. In addition it is necessary to complete
the "Benchmark" logbook.
For IE, it is necessary to complete a "Declaration of Conformity"
to indicate compliance to I.S.813. An example of this is given in
the current edition of I.S.813.
Testing Flue Gases: If any doubt exists that the flue products
are not exhausting correctly, investigate by use of a gas
analyser (FGA).
10 Commissioning - Instructions to the User
10.8 User Controls and Options
The mains reset switch is used to restart the boiler after a fault
condition has occurred, i.e. ignition failure.
The water temperature control knob allows the user to set the
desired temperature.
Temperature Display
The digtal display normally shows the operating temperature
of the unit.
10.9 Pump Exercise Program
After a power cut or every 24 hour in frost setting/summer mode
the pump will run for one minute to prevent it from sticking. This
will also occur during normal operating if there is no demand for
more than 24 hours
10.10 Frost Protection
The boiler has a built in frost protection programme as long as
the electricity and gas are left switched on.
This device operates the burner and system pump when the
temperature inside the boiler falls to 3
0 C.
When the temperature inside the appliance reaches 10°C the
burner will shut down and after a short period the pump will stop.
This device primarily protects the boiler. Any other exposed
areas of the system should be protected by a separate frost
thermostat.
10.11 Instruct the User
Instruct and demonstrate the lighting procedure and advise the
user on the safe and efficient operation of the boiler.
Instruct on and demonstrate the operation of any heating
system controls.
Advise the user on the use and maintenance of any scale
reducer and pass on any relevant instructional documents.
Advise that to ensure the continued efficient and safe operation
of the boiler it is recommended that it is checked and serviced
at regular intervals. The frequency of servicing will depend upon
the installation conditions and usage, but in general, once a
year should be enough.
Draw attention, if applicable, to the current issue of the Gas
Safety (Installation and Use) Regulations, Section 35, which
imposes a duty of care on all persons who let out any property
containing a gas appliance.
The user shall not interfere with or adjust sealed components.
It is the Law that any servicing is carried out by a competent
person.
Advise the user that, like all condensing boilers this appliance
will produce a plume of condensation from the flue terminal in
cool weather. This is due to the high efficiency and hence low
flue gas temperature of the boiler.
Advise the user of the precautions necessary to prevent damage
to the system, boiler and the building, in the event of the heating
system being out of use during frost or freezing conditions.
Advise the user that the permanent mains electrical supply
SHOULD NOT be switched off, as the built in frost protection
and pump saver program would not be operable.
Reminder, leave these instructions and the ‘Benchmark’ logbook
with the user.