90
Discovery, Discovery LXE, Pace Arrow, and Pace Arrow LXE
NOTE:
Fan speed is not adjustable
in heat pump mode.
NOTE:
The roof air conditioner
will not operate in
heat pump mode with
ambient temperature of
approximately 41° F. The
furnace will become the
primary heat source. If
zone temperature and
temperature set point
is greater than 5º, the
furnace will become the
primary heat source until
temperature disparity is
less than 5º.
Air Conditioner Maintenance
Return Air Filters:
Frequently clean the return
air lters. The lters are located
behind the return air vent cover.
To Remove Vent Covers:
There are 2-6” return
intake vent covers per roof
A/C.
Pull down on intake lter
cover.
Spread tabs apart to
remove lter retainer.
To Clean the Return Air
Filters:
Wash lters in warm soapy
water. Do not use solvents.
Rinse lters thoroughly
with fresh water. Allow to
thoroughly dry.
Install lters and snap intake
vent covers in place.
Mounting Bolts:
The roof air conditioners
are secured to the roof using a
“top-down” method. Silicone
sealant is applied upon initial
installation in conjunction with
a closed cell foam gasket. It is
recommended to annually check
torque of the securing fasteners.
This will require removal of the
exterior cover.
AC Cover Screws:
When periodically inspecting
the condition of roof sealant, it is
recommended to remove the AC
cover to check the torque of the
fasteners that secure the AC unit
to the roof. Replace the AC cover
when nished. Periodically check
torque of the fasteners securing the
cover to the base.
AQUA-HOT
The Aqua-Hot appliance is a
water heater and furnace combined.
A diesel red burner and/or two
AC elements (used separately or
in tandem) heat a 50/50 solution of
Propylene Glycol antifreeze and
water to approximately 190º F.
The heated antifreeze solution
circulates through heat exchangers
to provide interior heat.
Potable water is heated by the
Aqua-Hot for domestic use. The
Aqua-Hot also has an engine pre-
heat feature for easier starting in
cold temperatures. The Aqua-Hot
control switches are located in the
galley area and the engine pre-heat
switch is located at the dash.
NOTE:
Antifreeze is propylene
glycol based boiler
antifreeze. Do not mix or
substitute with automotive
antifreeze.
NOTE:
The Aqua-Hot must be
turned on to supply heat.
Select either diesel or
electric (or both) mode of
operation.
Diesel Burner:
The Aqua-Hot consumes
approximately .4 gallons of diesel
fuel per hour of continuous burner
operation. Recovery rate is faster
when operating on diesel versus
AC electric operation. To heat the
Aqua-Hot with the diesel burner,
press the Diesel switch. The Active
indicator will illuminate when the
Aqua-Hot diesel switch is on. The
burner will need to operate for
approximately 20 minutes before
maximum heat is available for
interior heating or hot water.
WARNING:
Carbon Monoxide
hazard! Do not operate
the diesel burner when
the motorhome is located
inside a building or in
confined areas where
exhaust gases may not
disperse adequately. Lethal
levels of Carbon Monoxide
can accumulate.
031221
Ensure the A/C cover screws are tight when
the roof is accessed.
Zone 1: Zone 3 Zone 4
Living Room
Bedroom/
Bathroom/
Water Center/
Water Tanks
Zone chart
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