Blue Bird Coachworks 450 LXi, Owner'S Manual

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450 LXi Owner Manual 4-8 Heating Systems
Rev. “C”
~ 4-8-3 ~
4-8.2.6 Resetting the Fault
When a fault occurs and has been corrected, you can reset the fault by switching the service switch on the side of the main
control box located next to the unit in the bay, or the remote control switch OFF, then ON again. This will reset the fault and
the diagnostic code.
4-8.2.7 Stopping the Heaters
(When coach is left for extended periods of time)
There are two heating systems supplied with the motor home. The Hydronic heat system has two thermostats located in the
bathroom and the galley. The bay electric heater has a thermostat located in bay 2, right. If the Auto Gen-Start feature on the
Inverter is Off and coach is unused for a period of time, (more than a day), be sure that all three thermostats are set to the
full Off position (the thermostat Off state has a detent position at the end of the full counterclockwise rotation). If not turned
to full Off position and motor home gets below 50°F, the hydronic heater pump turns On and the bay electric heaters turn On,
thus draining the battery. To use the Auto Gen-Start function on the inverter, refer to
Inverter Section section of this manual.
4-8.3 Heat Exchanger Operation
If your motor home is equipped with a heat exchanger to pre-heat your engine and recycle waste engine heat, follow these
procedures.
To pre-heat your engine: Turn on the heater by a manual switch or timer wired to the jumper W-W terminal, located in the
control box. If the heat exchanger is mounted upright, close to and near the bottom of the engine, it will transfer heat to the
engine’s cooling system through gravity circulation. A more positive solution is to install a pump on the engine side of the
heat exchanger wired to the A-A pump terminals located in the control box, on the main board in series with a master switch.
To use waste engine heat for space and domestic water heating:
Install a switch, and/or an aquastat (part #1027), on the engine supply line to the heat exchanger, and wire to the A-A
terminals on the main control board.
Turn OFF, the ON/OFF control switch, located on the remote indicator panel. This will stop the burner from operating, but
all other heater functions will operate normally.
Start your engine.
When the engine aquastat heats up to its preset temperatures, it will automatically switch on the circulating pump of the
heating system. All other functions of the system will operate normally.
The circulating pump will continue to operate until the engine aquastat has cooled down. A manual switch can be wired
in series with this aquastat to shut down the pump sooner if required.
4-8.4 Domestic Water Operation
If your water heater is connected to the hydronic heating system and its controlling aquastat (part #1024) is wired to the W-W
terminals on the main board, it will cycle the heater and the water pump. A manual switch can be wired in series with this
aquastat to shut down the operation if desired. A bypass loop can be plumbed in for summer operation.
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CAUTION!!
Where there is a chance of contamination of your domestic water when using a
heating system, use antifreeze specifi cally intended for hydronic heating systems. Inhibited propylene
glycol is recommended. Do not use automotive, ethylene glycol, or any undiluted or petroleum based
antifreeze as they can cause severe personal injury should antifreeze leak into your potable water
supply. Double wall heat exchangers are available for potable water which will prevent contamination
in the event of an internal leak.