Baxi HT 1.850 Installation, Operation And Maintenance Manual page 27

d. Turn the screw anti-clockwise to decrease pressure (CO
• Remove the pressure gauge from the P1OUT port and connect to the P2OUT port of gas valve 2.
• Turn the adjuster screw K2 of gas valve 2 so as to set the pressure value (Pout) as indicated in table 2.1
for natural gas (G20) and in table 2.2 for propane (LPG):
• Check that the CO value at minimum heat output is as indicated in table 2.1 or 2.2. The value can be
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optimized by making the necessary ne adjustment to screw K2.
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Figure 13a
IMPORTANT: in the event of converting the boiler from natural gas (G20) to propane (LPG), the following
operation must be carried out before proceeding to adjust the gas valve as described above:
• For models with one valve, replace the diaphragm on the gas valve outlet ( gure 12a).
To replace the diaphragm, disassemble the gas valve by undoing the inlet and outlet ttings, then unscrew
the nozzle with a pair of straight round nose pliers.
Check the uid-tightness of the gas ttings removed previously.
• For models with two gas valves, replace the diaphragm located at the venturi inlet ( gure 12b).
To enable this operation, the gas valve manifold must rst be removed.
Check the uid-tightness of the gas ttings removed previously.
• Set parameters H536 - H541 - H608 - H609 - H610 - H611 - H612 - H613 by way of the display on the
control panel.
The values to be set are given in tables 2.1 and 2.2. The programming methods are described in chapter 14.
ISTRUCTIONS PERTAINING TO THE INSTALLER
hydroheat.com.au
2
Figure 13b
13.3 GAS CONVERSION
27
decreasing).
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910.026.1 - EN (AUS)