VOKERA Mynute EHE Installation & Servicing Instructions Manual - page 16
14
Fig. 16
Protective
cap
Outlet
test-point
Inlet
test-point
SECTION 5 COMMISSIONING
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, conse-
quently it is essential that the system be flushed in accord-
ance 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 valve and loosen the dust cap by
turning the cap anti-clockwise one full turn.
IMPORTANT,
THERE ARE NO MANUAL AIR RELEASE VALVES LO-
CATED ON THE APPLIANCE.
Ensure all manual air
release valves located on the heating system are closed.
Connect the filling loop as shown in fig. 6 and 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 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
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 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 7.7) particularly continuity, polarity, and resist-
ance 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. Move the selector switch to the ON position, ensure all
external controls are calling for heat.
The appliance will now operate in the mode as described
in 1.2. Should the appliance fail to ignite, refer to 5.5 and/
or section 7 (faultfinding).
5.7
CHECKING GAS PRESSURE AND COMBUSTION
ANALYSIS
The appliance is factory set and requires no additional
adjustment once installed. However to satisfy the require-
ments 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 combus-
tion 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 malfunc-
tion 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 exchangers. It shall be from a reputa-
ble manufacturer and shall be administered in strict ac-
cordance with the manufacturers’ instructions and the
DWTA code of practice.
NOTE
Chemicals used to cleanse the system and/or inhibit
corrosion must be pH neutral, i.e. they should ensure that
the level of the pH in the system water remains neutral.
Premature failure of certain components can occur if the
level of pH in the system water is out-with normal levels.
5.8.1
INHIBITORS
See section 3 “General requirements”.
5.9
SETTING THE BOILER OP
ERATING TEMPERATURE
The flow outlet temperature can be adjusted between 40ºC
- 80ºC via the heating thermostat knob (see fig.1).
5.10
SETTING THE SYSTEM DESIGN PRESSURE
The design pressure should be a minimum of 1 BAR and
a maximum of 1.5 BAR.
The actual reading should ideally be 1BAR plus the equiva-
lent height in metres (0.1 BAR = 1 metre) to the highest point
in the system above the base of the appliance (up to the
maximum of 1.5 BAR total).
N.B.
The safety valve is set to lift at 3 BAR/30 metres/45 psig.
To lower the system pressure to the required value, water
can be drained from the heating system drain cock or from
the boiler drain cock.
5.11
REGULATING THE CENTRAL HEATING SYSTEM
Fully open all radiator and circuit valves and run the
appliance for both heating and hot water until heated water
is circulating. If conditions are warm remove any thermo-
static heads. Adjust radiator return valves and any branch
circuit return valves until the individual return temperatures
are correct and are approximately equal.
5.12
FINAL CHECKS
●
ENSURE ALL TEST NIPPLES ON THE APPLIANCE
GAS VALVE HAVE BEN TIGHTENED AND CHECKED