19-07-05
Page 7 of 20 Operation Instructions for Jervois Freestanding Gas Heater March 2002
CONNECTING THE HEATER TO A GAS SUPPLY
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Burn only the fuel for which the heater is equipped.
The YUNCA JERVOIS may be shipped from the factory equipped to burn Natural Gas, Propane or
L.P.G. The data plate affixed to the back of the heater specifies the gas type, which the heater is
factory equipped for. Fuel Conversion Kits are available, contact your YUNCA agents.
Thermostat:
The thermostat sensing bulb is mounted on the back panel.
Gas connection:
The gas inlet is located at the back right hand corner of the heater. The inlet thread is a male 3/8" BSP.
A separate gas isolation valve should be installed immediately up stream of the connection to the
appliance.
WARNING: To stop pipe compounds entering the gas line, do not apply sealing compounds to the
first two threads at the tip of any gas connection. All joints should be tested for leaks before operating
the heater.
GAS PRESSURE REQUIREMENTS
Correct gas pressure and the use of a properly sized gas supply line is essential for the safe and
efficient performance of this appliance. The inlet and outlet pressures at the control must be tested on
installation following the procedure over page.
Note: Improper gas pressure will affect heater performance flame colour or cause pilot malfunction.
Natural Gas:
Minimum inlet pressure 1.25 KPa (5"w.g.)
Maximum inlet pressure 5.0 KPa (20"w.g.) With supplied inline regulator fitted.
Operating pressure 1.0kPa (4"w.g.)
L.P.G. (NZ Only) and Propane
Minimum inlet pressure 2.75 KPa (11"w.g.)
Maximum inlet pressure 3.5 KPa (14"w.g.)
Operating pressure 2.5 KPa (10"w.g.)
CAUTION: Do not use this heater if any part has been under water or exposed to moisture causing
corrosion.
A Qualified service technician should inspect the heater and replace any part of the gas system that
has been under water.
