Section 6, Wiring the Electrical System
International Thermal Research 6-7
Wire the positive terminal of the house battery through a
25-amp, heavy-duty rated fuse (using #10-gauge wire) to
the positive terminal on the control board inside the main
control box. Wire the negative terminal of the house
battery to the negative terminal of the control board. Wire
the heater ground wire directly to battery negative.
Using the recommended wire gauges, prepare all wire
terminations for approved connections from the control
board to each of the fan heaters and thermostats (and any
optional switches).
Wire the fan heaters to the terminals in the control board
using #16 wire (minimum) and a #8 fork connection on
each fan. There are four terminals, F1 to F4,
corresponding to the four zones. See Figure 6-4.
Connect the fan grounds to the negative terminal of the
battery or to an adjacent chassis ground location.
Wire the thermostats for the fan heaters to the terminals
in the control board using #18-gauge wire (minimum) and
a single #8 fork connection. See Figure 6-4 for the correct
terminals (T1 to T4, and T-C common).
If domestic water heating, engine waste heat, or
summer/winter loop functions of the heater are required.
See Sections 8 and 9 for details.
If installing any optional fan speed switches, wire them to
the RV’s wiring system, not to the heater control board.
Install the switch between the fan circuit and the positive
DC fan connection using #16 wire (minimum) and a #8
fork connection. See Figure 6-2 switch wiring diagram.
Mount the Basic or Touchscreen remote panel in the living
areas where it can be easily accessed. Any accessory
switches should be mounted adjacent to the remote panel
for ease of use.
Connect the remote cable from the control board to the
remote panel.
Ensure that all pre-wired connections between the heater
and control box are secure.
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