17
5.1 GAS SUPPLY INSTALLATION
Inspect the entire installation including the gas meter, test
for soundness and purge. Refer to BS 6891 (I.S. 813 in
ROI) for specific instruction.
5.2 THE HEATING SYSTEM
The appliance contains components that may become
damaged or rendered inoperable by oils and/or debris that
are residual from the installation of the system,
consequently it is essential that the system be flushed in
accordance with BS 7593 Code of Practice and the following
instructions.
5.3 INITIAL FILLING OF THE SYSTEM
Remove appliance casing as described in 4.7.1, identify
the automatic air release valves (AAV) and loosen the dust
cap/s by turning the cap anti-clockwise one full turn.
Ensure all manual air release valves located on the heating
system are closed. Proceed to fill the system via the feed
and expansion tank and begin venting all manual air
release valves, starting at the lowest first. Once the
system has been filled. Inspect the system for water
soundness, rectifying any leaks.
5.3.1 MANUAL AIR RELEASE (fig. 17)
When the boiler has been filled for the first time or the
system has been drained and refilled, it will be necessary
to release any air that may have become trapped within
the appliance heat exchanger. Slacken the bleed screw
until water is released and then close.
IMPORTANT, THERE ARE NO OTHER MANUAL AIR
RELEASE VALVES LOCATED ON THE APPLIANCE.
5.4 INITIAL FLUSHING OF THE SYSTEM
The whole of the heating system must be flushed both
cold and hot as detailed in 5.8. Open all radiator and/or
heating zone valves. Drain the boiler and system from the
lowest points. Open the drain valve full bore to remove
any installation debris from the boiler prior to lighting. Refill
the boiler and heating system as described in 5.3.
5.5 PRE-OPERATION CHECKS
Before attempting the initial lighting of the appliance, the
following checks must be carried out:
•
Ensure all gas service valves from the meter to the
appliance are open and the supply pipe has been properly
purged;
•
Ensure the proper electrical checks have been carried
out, (see 7.8) particularly continuity, polarity, and
resistance to earth;
•
Ensure the 3 AMP fuse – supplied with the appliance –
has been fitted.
•
Ensure the system has been properly filled and vented.
•
Ensure the flue system has been fitted properly and in
accordance with the instructions.
5.6 INITIAL LIGHTING
Ensure the electrical supply to the appliance is switched
on. Ensure any external controls are switched to an ‘ON’
position and are calling for heat.
Move the selector switch to the ON position, the appliance
will now operate as described in 1.2. Should the appliance
fail to ignite, refer to 5.6 and/or section 7 (mode of operation
& faultfinding).
NOTE
When power is restored to the PCB and/or the PCB is
powered for the first time, the appliance will enter a 2-
minute purge cycle whereby only the pump will run for 15-
seconds then off for 15-seconds and will not “fire” until this
period has elapsed.
5.7 CHECKING GAS PRESSURE AND COMBUSTION
ANALYSIS
The appliance is factory set and requires no additional
adjustment once installed. However to satisfy the
requirements of GSIUR 26/9 (I.S. 813 ROI), it will be
necessary to gas rate the appliance using the gas meter
that serves the appliance.
If the installation does not include a gas meter (for example
LPG) and there are no means by which to calculate the
gas rate, then a combustion analysis test must be carried
out in accordance with BS 7967 (UK) to ensure the
appliance is left working safely and correctly.
Additionally, if the gas valve has been adjusted, replaced,
or the appliance has been converted for use with another
gas type, then it becomes necessary to carry out a
combustion analysis/check to ensure that correct
combustion is occurring.
If there are no means to gas rate the appliance and/or
carry out a combustion analysis check, then it will not be
possible to complete the commissioning procedure.
Details on how to carry out the combustion analysis can
be found in section 7.
IMPORTANT
It’s imperative that a sufficient dynamic – gas –
pressure is maintained at all times. Should the
dynamic gas pressure fall below an acceptable level,
the appliance may malfunction or sustain damage.
5.8 FINAL FLUSHING OF THE HEATING SYSTEM
The system shall be flushed in accordance with BS 7593
Code of Practice (I.S. 813 ROI). Cleansers or chemicals
used, must be suitable for Aluminium heat exchangers
and shall be from a reputable manufacturer and shall be
administered in strict accordance with the manufacturers’
instructions.
5.8.1 INHIBITORS
See Section 3 “General Requirements”.
SECTION 5 COMMISSIONING
Fig. 17