(2) On Model BT400-40-1 heaters, disen-
c. Starting Electric Motor Power Unit. The
gage cabinet latches and open cabinet
heater, operating with electrical power pack,
must be grounded prior to operation. The
ground can be in order of preference, and un-
(3) Perform the necessary daily preven-
derground water piping system, a metal rod
driven into the ground, or a metal plate buried
(4) Remove air outlet and exhaust stack
in the ground. A ground rod must have a mini-
mum diameter of 3/4-inch if hollow or 5/8-
(5) Remove fuel tank cap and insure that
inch if solid, and it must be driven to a depth
the cap valve is set to OPEN. Install
of at least 8 feet. A ground plate must have
fuel tank cap.
a minimum area of 9 square feet and must be
b. Starting Gasoline Engine Power Unit.
buried to a depth of at least 4 feet. The
(1) Refer to figure 14 and follow instruc-
ground lead must be a No. 6 AWG (American
tions to start the gasoline engine pow-
Wire Gage) copper wire. Bolt or clamp one
end of the ground lead to the ground rod,
(2) After power unit is started, secure
ground plate, or piping system. Connect the
cabinet in closed position using cab-
other end of the ground lead to the heater.
Start electric motor power unit in the following
Starting gasoline engine power unit.