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8-4
Procedure
To set up the engine pre-heat function:
1
Mount a manual switch in an appropriate place in the
interior, usually near the dashboard.
2
Wire the manual switch to the engine water pump by
connecting it to the main feed on the control board that
connects to the vehicle's power source (beside the battery
connection, see Figure 6-4 in Section 6, Wiring the
Electrical System). The switch circuit should include a 5-
amp fuse on the power side.
3
Connect the ground-wire of the engine water pump to
battery negative.
4
To test the engine pre-heat function, turn on the heater
and allow it to come to temperature (about 10 minutes).
Turn on the manual switch to start the engine pre-heat
pump. Start the vehicle engine, which should now be pre-
heated to about 40°F (5°C) above ambient temperature.
Installation Manual for Oasis® Zephyr™ HW Heating System
Section 8, Domestic Hot Water Heating
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