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DUALAIR
®
HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
30
SECTION 14: CONVERSION BETWEEN GASES
14.1 General
Conversion between gasses will require a change of
burner injectors and the gas valve re-commissioning
to the new conditions.
14.2 Burner Conversion
Conversion of the burner assembly from one gas to
the other is the same for all types of heaters.
1. Remove the burner compartment cover as
shown on Page 37, Section 16.2.
2. Remove the connection between the gas valve
outlet and the manifold. See Page 36, Section
16.1 for gas valve removal.
3. Remove the manifold from the burner assembly
by removing the screws at the top and bottom.
See Page 37, Section 16.2.1.
4. Remove the main burner injectors.
5. Replace with the injectors for the new gas
ensuring a gas tight seal.
6. Refit all components in reverse order.
14.3 Gas Valves
All gas valves used on the DualAir
®
units have
pressure regulators that may be set to operate on
natural gas or LPG.
Conversion is carried out by re-setting the burner
pressure to the value in the data table during
commissioning. See Page 7, Section 4.3.
Ensure that the gas inlet pressure to the heater is
correct for the new gas, and that the gas supply has
been purged of the old gas.