VOKERA Mynute EHE Installation & Servicing Instructions Manual - page 37
35
SECTION 10
L.P.G. INSTRUCTIONS
10.3
CONVERTING THE APPLIANCE GAS TYPE
To convert the appliance to another gas type it is necessary
to change the burner injectors and adjust the gas pres-
sures. It is also necessary to ensure the jumper tag at JP3
is enabled or disabled according to the gas type used.
●
To change the injectors see section 6.
●
For correct jumper tag configuration see 7.8.
10.4
GAS SUPPLY
The gas supply must be connected to the appliance by a
competent LPG installer and must be of sufficient size to
supply the appliance at its maximum output.
An existing supply must be checked to ensure that it is of
adequate size to deal with the maximum rated input of this
and any other appliances that it serves.
10.5
GAS SUPPLY INSTALLATION
The entire installation including the meter must be
purged and checked for gas soundness.
10.6
CHECKING AND ADJUSTING BURNER PRESSURE
(fig. 24)
Isolate the appliance from the electrical supply and attach
a suitable manometer to the gas valve outlet test point.
10.6.1 SETTING THE MAXIMUM BURNER PRESSURE
(fig. 34)
Isolate the appliance from the electrical supply and attach
a suitable manometer to the gas valve outlet test nipple.
Temporarily fit a jumper tag at JP2 on the PCB.
Restore the electrical supply and ensure that all controls
are calling for heat, i.e. ensure the boiler is working under
full load condition.
Compare the reading on the manometer with the value
described in 10.2. If adjustment is required, remove the
protective cap from the gas valve modulating coil assembly
and turn the outer (10mm) nut clockwise to increase, or
counter-clockwise to decrease the burner pressure.
BS 6798
INSTALLATION OF BOILERS OF RATED NOT EXCEEDING 60kW
BS 5449
PART 1
FORCED CIRCULATION HOT WATER SYSTEMS
BS 5546
INSTALLATION OF GAS HOT WATER SUPPLIES FOR DOMESTIC PURPOSES
BS 5440
PART 1
FLUES
BS 5482
PART 1
DOMESTIC BUTANE & PROPANE GAS BURNERS IN PERMAMENT DWELLINGS
10.1
RELATED DOCUMENTS
10.2
TECHNICAL DATA
GAS PRESSURES
Inlet pressure
37 mbar
37 mbar
37 mbar
Burner pressure maximum
35.70 mbar
35.50 mbar
35.60 mbar
Burner pressure minimum
12.80 mbar
10.00 mbar
7.00 mbar
Maximum gas rate
1.94 Kg/h
2.25 mbar
2.70 mbar
Minimum gas rate
1.16 Kg/h
1.16 mbar
1.16 mbar
Injectot size (quantity)
12 x 0.76
14 x 0.76
16 x 0.76
SEDBUK (%)
87.7 Band “B”
87.9 Band “B”
87.7 Band “B”
NOx (max - min) PPM
200 - 120
250 - 180
250 - 180
CO (max - min) PPM
90 - 100
100 - 190
80 - 120
CO
2
(%)
7.60 - 4.35
8.20 - 4.00
7.7 - 3.10
CO/CO
2
ratio (max - min)
0.001 to 1 - 0.002 to 1
0.001 to 1 - 0.005 to 1
0.001 to 1 - 0.004 to 1
10.6.2 SETTING THE MINIMUM BURNER PRESSURE (fig.
34)
Once the maximum burner pressure has been checked
and/or adjusted, remove one of the grey wires from the
modulating coil. Compare the reading on the manometer
with the value described in 10.2.
If adjustment is required, turn the inner (red) crosshead
screw clockwise to increase, or counter-clockwise to de-
crease the burner pressure, whilst ensuring that the outer
(10mm) nut does not move. When checking and/or adjust-
ment has been completed, isolate the appliance from the
electrical supply, replace the protective cap, refit the grey
wire to the modulating coil, remove the manometer and
tighten the outlet test point.
IMPORTANT, A GAS SOUNDNESS CHECK MUST BE
CARRIED OUT.
25 EHE
29 EHE
35 EHE