Remote Control - Onan DKHA Series Installation Manual

REMOTE CONTROL

General
Two wiring harnesses are packaged with the APU
for remote control connections (Figure 6-2). They:
• Connect the APU to the operator panel
• Provide B+ and B− for HVAC unit control
through connector P7 and the APU
• Provide for a start signal from the HVAC unit to
the APU when there is a demand for heating or
air conditioning.
• Provide for shutting down the APU with ignition
and shore power interlocks.
For further reference see the Control Schematics on
Pages A-1 and A-2.
Accidental starting of the APU can
WARNING
cause severe personal injury or death. Until the
APU is ready for startup, ensure that the APU's
remote control connector is disconnected, the
circuit breaker is OFF and that both negative (−)
and positive (+) battery cables are disconnected
at the batteries.
Operator Panel
Mount the Operator Panel at a convenient location
for the user, preferably on the same panel as the
HVAC control panel. Follow the instructions in the
kit.
Shore Power Interlock
If provision has been made for connecting shore
power, provide a normally open relay to shut down
the APU when shore power is connected. Connect
the shore power interlock relay to the yellow leads in
the APU remote harness. See Page A-2 for details.
Interconnecting the APU and shore
WARNING
power can lead to electrocution of utility line
workers, equipment damage and fire. Use an ap-
proved switching device to prevent intercon-
nections.
Ignition Interlock
If it is desired to always shut down the APU when the
vehicle engine is started, connect a normally open
ignition relay or switch to the blue leads in the APU
remote harness. See Page A-2 for details.
Wiring
Open the wiring junction box in the upper corner of
the HVAC unit. Route the wiring harnesses through
their respective bulkhead bushings and plug the
mating connectors together as illustrated in Fig-
ure 6-2.
The insulated, color-coded, crimp-on butt connec-
tors in harness 338−4874 are for connection of the
ignition and shore power interlock circuits. They
need not be connected for the APU to run. See
Shore Power Interlock and Ignition Interlock. Se-
cure the junction box cover when all connections in-
side have been made.
Route or protect control wiring so that it will not be
cut or abraded, exposed to hot surfaces or dam-
aged by road debris. Keep control wiring away from
AC power leads to reduce the possibility of erratic
operation due to induced signals.
Seal all wiring openings into the vehicle interior to
keep out exhaust gas. Apply silicone rubber or
equivalent sealant.
EXHAUST GAS IS DEADLY! Seal all
WARNING
wiring openings into the vehicle interior to keep
out exhaust gas.
6-3