Aqua-Hot’s boiler tank where heat is transferred from the heated antifreeze and water heating solution to the domestic
water flowing through the copper coil. The heated domestic water then flows through the tempering valve to be mixed
with cool water from the fresh water tank to achieve an appropriate temperature before it flows to the faucet requesting
hot water.
Engine Preheat System:
The engine preheat system is responsible for heating the motor home’s engine block in order to make it easier to start-
up when cool weather conditions exist. When the engine preheat system is activated via the interior switch panel, the
motor home’s engine coolant is circulated through a dedicated copper coil in the Aqua-Hot’s boiler tank, where heat from
the antifreeze and water heating solution is transferred to the motor home’s engine coolant. The heated engine coolant
is then transported back to the engine where it transfers the heat to the engine to gradually warm it. Additionally, the
Aqua-Hot 450D includes a motor-aide feature, which uses the circulation of the motor home’s engine to transport the
engine’s coolant from the Aqua-Hot’s boiler tank to the motor home’s warm engine and back to the boiler tank. Through
this process, the boiler tank is kept heated, which reduces the time required to bring the tank to operating temperature
for interior heat and continuous domestic hot water. This motor-aide feature is part of the engine preheating feature and
plumbing system, and requires no action on the user’s behalf to function.
Interior Heating System:
The interior heating system is responsible for providing heat to the motor home’s interior in order to maintain the
temperature at a comfortable level. For interior heating, it is the room thermostats that trigger the Aqua-Hot’s interior
heating system. When a thermostat recognizes that heat is required in a particular area, it sends a signal to the Aqua-
Hot’s Reporter calling for heat. The Aqua-Hot responds by activating the circulation pump for that zone, which sends the
heated antifreeze and water heating solution through the Heating Loop corresponding to the zone requesting heat. The
fans on the heat exchangers in the zone calling for heat are also activated; therefore, as the heated solution flows
over the heat exchanger’s fins, the heat is transferred to those fins and dispersed into the interior of the motor home by
the fans. Until the thermostat signals that heat is no longer required, the Aqua-Hot will continue to send the heated
antifreeze and water solution through the loop, which returns the cooled solution to the Aqua-Hot’s boiler tank to be
reheated before being sent back through the loop again. This process continues until the preset temperature of the
interior is reached, and the interior room thermostat signals the Reporter that heat is no longer required.
AC Circuit:
Although the diesel-burner is the primary heating source for the Aqua-Hot and is necessary for providing continuous
domestic hot water, an alternate heat source exists for moderate temperatures, which functions with an AC circuit.
Whenever the motor home is connected to an AC power source, plugged into shore power or using a generator, the
Aqua-Hot’s electric heating element has the ability to function in order to provide heat for the boiler tank. When the
antifreeze and water heating solution falls below operating temperature (as determined by the control thermostat/ETS
Module), a signal is sent to the Reporter requesting heat. Because the electric element switch is activated on the interior
switch panel, the DC power from the Reporter is permitted to flow to the AC relay, which activates the relay in order to
allow AC power to flow to the electric heating element. When the electric heating element receives power, it becomes
active and supplies heat to the boiler tank until operating temperature is reached.
https://tiffin-motor-homes-prod.mindtouch.us/Technical_Support/Class_A/2024/Allegro_Bus/35_CP/Component_Manuals/Aqu…
Updated: Fri, 21 Jun 2024 03:21:17 GMT
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