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17
UNICA BHE
SECTION 5 COMMISSIONING
5.1
GAS SUPPLY INSTALLATION
Inspect the entire installation including the gas
meter, test for tightness 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 installa-
tion of the system, consequently it is essential
that the system be 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
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. Connect the filling
loop as shown in fig. 5, slowly proceed to fill the
system by firstly opening the inlet valve con-
nected to the flow pipe, and then turning the lever
on the fill valve, to the open position. 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 tightness, rectifying any leaks.
5.3.1
MANUAL AIR RELEASE (fig. 20)
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 ex-
changer. Slacken the bleed screw until water is
released and then close.
IMPORTANT, THERE ARE NO OTHER MANUAL
AIR RELEASE VALVES LOCATED ON THE
APPLIANCE.
Fig. 20
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
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.
5.6
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, parameter set-
ting & faultfinding).
5.7
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 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 neces-
sary 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 com-
missioning procedure.
Details on how to carry out the combustion analy-
sis can be found in section 7.