18
5.1
GAS SUPPLY INSTALLATION
Inspect the entire installation including the gas
meter, test for soundness and purge. Refer to BS
6891 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 the follow-
ing instructions.
5.3
INITIAL FILLING OF THE SYSTEM
Ensure both flow and return service valves are
open, 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.
IMPORTANT, THERE ARE NO MANUAL AIR
RELEASE VALVES LOCATED ON THE APPLI-
ANCE. Ensure all manual air release valves lo-
cated on the heating system are closed.
Connect the filling loop as shown in fig. 6B, slowly
proceed to fill the system by firstly opening the
inlet valve connected to the flow valve, and then
turning the lever on the combined stopcock and
check valve, to the filling position (see fig. 18). As
water enters the system the pressure gauge will
begin to rise. Once the gauge has reached 1 BAR
close both valves and begin venting all manual air
release valves, starting at the lowest first. It may
be necessary to go back and top-up the pressure
until the entire system has been filled. Inspect the
system for water soundness, rectifying any leaks.
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 or heating valves and the appliance flow &
return service valve. 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
FILLING THE HOT WATER SYSTEM
Close all hot water outlets, turn appliance stop-
cock to the normal operating position (fig. 18),
slowly open each outlet until air has been expelled
and clear water is discharged.
Check pipe-work etc. for water soundness.
5.6
PRE-OPERATION CHECKS
Before attempting the initial lighting of the appli-
ance, 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 filled, vented, and
the pressure set to 1 BAR;
●
ensure the flue system has been fitted properly
and in accordance with the instructions;
●
ensure all appliance service valves are open.
5.7
INITIAL LIGHTING
Ensure the electrical supply to the appliance is
switched on. Press the ON/OFF switch to switch
the appliance ON (indicated by active display),
ensure any external controls are switched to an
‘ON’ position and are calling for heat.
Press the function button and select
Winter mode,
the appliance will now operate in the
Winter mode
as described in 1.2. Should the appliance fail to
ignite, refer to 5.6 and/or section 7 (mode of
operation, parameter setting, & faultfinding).
5.7.1
CHECKING GAS PRESSURE AND COMBUS-
TION 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 togas 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 nomeans by which
to calculate the gas rate, then a combustion
analysis test must becarried out in accordance
with BS 7967 (UK) to ensure the appliance is left
workingsafely and correctly.Additionally, if the gas
valve has been adjusted, replaced, or the
appliance has beenconverted for use with another
gas type, then it becomes necessary to carry out
acombustion 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 analysischeck, then it will not be
possible to complete the commissioning proce-
dure. 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 maymalfunction or sustain
damage
5.8
FINAL FLUSHING OF THE HEATING SYSTEM
The system shall be flushed in accordance with
BS 7593. Should a cleanser be used, it must be
suitable for Copper and Aluminium heat exchang-
SECTION 5 COMMISSIONING
normal op-
erating posi-
tion
filling posi-
tion
closed
position
Fig. 18
