Controls Overview; Switches; Thermostats; Interior Heating Operation - Aqua-Hot 400 Series Use & Care Manual

Do not operate the diesel-burner and/or electric element
without the antifreeze and water heating solution in the
Aqua-Hot's boiler tank. Failure to do so will cause serious
damage to the heater.

Switches:

The Aqua-Hot heating system is controlled by two switch-
es, the burner switch and the electric element switch. This
style of Aqua-Hot is equipped with an Engine Preheat ele-
ment as well. When one or both the burner or electric ele-
ment switches are in the ON position, it will supply the nec-
essary heat to the boiler tank. Keep in mind that the Aqua-
Hot must be at operating temperature for the heating zones
and hot water to function properly. Please contact the spe-
cific motorhome dealer for the exact location of switch oper-
ations.
Overview:
The heating features are powered by a 12 Volt-DC diesel-
burner and a 120 Volt-AC electric heating element. These
two heating elements maintain the temperature of the Aqua
-Hot's antifreeze and water heating solution to provide hot
water and heat to the motor home.
·
Diesel– The diesel-burner is the Aqua-Hot's primary
and most powerful heat source and provides all of the
heating and hot water needs when cold temperatures
exist and/or when there is a high demand for hot water.
It can be activated by turning the burner switch in the
ON position. Reference Figure 1 on following page.
·
Electric– The electric element is the Aqua-Hot's second-
ary heat source and can be used when plugged into
shore power. The electric element provides heat when
moderate temperatures exist (50 F or higher) and/or
when there is a low demand for hot water. It can be
activated by turning the electric switch in the ON posi-
tion. Reference Figure 1 on following page.

Controls Overview

Thermostats:

The interior room thermostat can be set at the desired
temperature; therefore, whenever the interior of the room
"calls for heat", the Aqua-Hot's circulation pump and interi-
or heat exchanger fans will be activated. The fresh water
thermostat controls the bay heating area and should NOT
be set below 40°F, to prevent freezing of the domestic
water storage system. Please contact the specific motor
home dealer for exact location of thermostat controls.

Heating Operation

·
Engine Preheat- In order to use the Engine Preheat
element on the Aqua-Hot system, both the diesel-
burner AND the engine preheat switch must be turned
ON. Allow the engine preheat element to function for
one hour before starting the vehicle's engine. Refer-
ence Figure 1 on following page.

Controlling Heat Levels:

The interior room thermostat can be adjusted at the
desired temperature and will automatically be activated to
maintain the temperature of the interior. Keep in mind that
the diesel and/or electric element switch on the interior
switch panel must be in the ON position for the heat to op-
erate.

Control/Balancing Heating Zones:

Set the interior room thermostat for each independent
heating zone at the desired temperature. This feature al-
lows you to customize various temperatures on each heat-
ing zone throughout your motor home.
Aqua-Hot®
Aqua-Hot Heating System Features

Interior Heating Operation

450-D Use & Care Guide 8
p.