Section 6, Wiring the Electrical System
International Thermal Research 6-5
• Circulating pump jumper – on the control board
allows the circulating pump to operate without turning
on the heater. This function is use to test the system
circulation.
• Battery connector – is the connection points for the
positive and negative power from the house battery to
the heater.
• Remote connector – is the connection point for the
cable from the Basic or Touchscreen remote panel.
• Service switch – allows full (service switch on) or
partial (service switch off) operation of the functions of
the heater control board. In the OFF position, it will only
allow the circulating pump and cabin fan circuitry of the
control board to run in response to both a call for heat
(thermostat or domestic water aquastat) and the
presence of an alternate heat source (engine or electric
heating element) supplying adequate heat to the
system. The operating circuitry of the burner in the
heater itself is non-functional. In the ON position, all
operations and features of the heater and control board
are functional. In normal operation, the service switch is
left ON.
NOTE: The service switch has an additional short circuit
fault (# 3 – 4 – 5 – 6 – 8) reset function. This is
performed by turning the service switch OFF, then ON.
• Hour meter – located on the front left corner of the
heater, counts the accumulated operating hours for the
12Vdc burner components of the heater.
• Basic Remote panel (option 1) – enables the diesel
burner and allows operational control and fault reset
from inside the vehicle; it also provides diagnostic
information. The remote panel connects to the remote
connector on the control board via a 25’ or 50’ cable.
• Touchscreen Remote panel with Wi-Fi (option 2) –
enables the diesel burner and allows operational control
and fault reset from inside the vehicle; it also provides
diagnostic information. The remote panel connects to
the remote connector on the control board via a 25’ or
50’ cable. For operating instructions and Wi-Fi operation
of the Touchscreen Remote refer to the “Quick
Operations Guide” provided with the Touchscreen
Remote.
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