16
Compact
5.1
GAS SUPPLY INSTALLATION
Inspect the entire installation including the gas
meter, test for soundness and purge.
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 installa-
tion of the system, consequently it is essential
that the appliance is flushed in accordance with
the following instructions.
5.3
INITIAL FILLING OF THE SYSTEM
Ensure both flow and return service valves are
open, remove appliance casing as described in
section 4.7.1, identify the automatic air release
valve, and loosen the dust cap by turning cap
anti-clockwise one full turn. IMPORTANT, THERE
ARE NO MANUAL AIR RELEASE VALVES
LOCATED ON THE APPLIANCE. Ensure all
manual air release valves located on the heating
system are closed. Using the method of filling as
described in fig. 5, slowly proceed to fill the
system, as water enters the system the pressure
gauge will begin to rise, once the gauge has
reached 1 bar close the filling valve 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
The whole of the heating system must be flushed
both cold and hot as detailed in section 5.9. open
all radiator or heating valves and the appliance
central heating valves. Drain the boiler and sys-
tem 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 section 5.3.
5.5
FILLING THE HOT WATER SYSTEM
Close all hot water outlets, turn appliance stop-
cock on (anti-clockwise), slowly open each outlet
until all air has been expelled and clear water is
discharged. Check pipe-work etc. for water sound-
ness.
5.6
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.
SECTION 5 COMMISSIONING
●
Ensure the proper electrical checks have been
carried out (section 7.11), 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, aired, and
the pressure set to 1bar.
●
Ensure the flue 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. Switch the time clock or programmer
to an ‘on’ position and ensure all external controls
are also calling for heat.
The appliance will now operate in as described in
section 1.2. Should the appliance fail to ignite,
refer to section 5.6 and/or section 7 (fault finding).
5.8
CHECKING BURNER PRESSURES
Although burner pressures are set at the factory,
it is necessary to check them during the
commissioning procedure. Isolate the appliance
from the electrical supply and remove the casing
as described in section 4.7.1.
After attaching a manometer to the outlet test
point of the gas valve (fig. 23), restore the electrical
supply to the appliance, turn the selector to hot
water only (summer position), and rotate the
DHW temperature selector to maximum.
Maximum burner pressure
Fully open a hot water outlet – preferably the bath
tap – and check that reading on the manometer
corresponds to the data given in section 2.3.
Minimum burner pressure
After checking the maximum burner pressure,
remove one of the black wires from the
modulating coil on the gas valve. The burner
pressure will drop to the minimum setting. Check
that the reading on the manometer corresponds
with the data given in section 2.3.
Once the gas pressures have been checked:
●
isolate the appliance from the electrical supply
●
close the hot water outlet
●
remove the manometer from the outlet test
point and tighten the test point screw
●
refit the appliance casing.
Should either the maximum or minimum burner
pressure require to be adjusted, refer to section
7.6 for the correct adjustment procedure.
Fig. 15
Gas pressure adjustment
protective cover
Maximum pressure
adjustment screw (a)
Minimum pressure ad-
justment screw (b)
