Section 9 – Operation
OPERATION
International Thermal Reseach 9-3
9.2 Starting the Heater
Never attempt to start the heater
without the burner faceplate securely
fastened to the burner box
Do not operate the Oasis SCH33 Heating System until it is filled
with a suitable heat-transfer (water/anti-freeze) solution and
all trapped air has been bled or removed.
The major steps in starting the heater are as follows:
For TouchScreen Remote functions, refer to the “Touchscreen
Remote (V2001) Quick Operation Guide” supplied with the touch
screen.
1. Start the heater by switching the service switch to ON. This
switch is located on the side of the electronic control box.
2. Turn up the zone thermostat to a setting higher than room
temperature.
3. On the Basic or Touchscreen Remote, activate the burner.
9.3 Signs of Normal Operation
• When the service switch on the side of the control box is
switched ON and the burner is OFF on the Basic or Touchscreen
remote, the combustion air intake fan will run for two minutes
together with the circulating pump. (Whenever the combustion
fan runs, the pump will also run. The green LED, visible at the
bottom of the display window on the control board, indicates the
pump is running).
• When the burner switch is turned ON, and there is a call for heat
in one of the space heating or domestic water heating zones, the
ignitor will turn ON. After 10 seconds, the combustion fan will
shut off for about a second, at which point the fuel pump, fuel
solenoid, air compressor and combustion fan all turn ON at the
same time. This results in atomized fuel being sprayed into the
combustion chamber to be ignited to start combustion.
• After the ignition period (about 10 seconds), the igniter will shut
OFF, and the burner will continue to operate. The heater will
operate until the domestic water and all zone thermostats are
satisfied, or until the heater reaches its normal cycling
temperature of approximately 180°F. Once this happens, the
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