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Hydro-Hot Hydronic Heating System Shop Manual 07/03

By Vehicle Systems

Diesel

Electric

Engine

Preheat

Diesel-Burner’s

Indicator

Light

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Page 4

Section 3: General Heater Information

3.0 Switch Panel

Switch Panel

Figure 4

3.1 Diesel Switch

Function: The Diesel switch activates the indicator light on the switch and

the Hydro-Hot's Diesel-Burner, reference Figure 4. This procedure allows

the Diesel-Burner to operate and supply heat to the Hydro-Hot's Boiler

Tank. The Diesel-Burner will heat the Hydro-Hot System to maximum

operating

temperature

(190�F {+/- 5 deg.}) in approximately 10-20 min-

utes. Please note that the Diesel-Burner is the Hydro-Hot's primary heat

source for heating both the interior and/or the domestic hot water (such

as when cool ambient temperatures exist and/or when there is a high

demand

for domestic hot water).

3.2 Electric Switch

Function: The Electric switch activates the indicator light on the switch

and the Hydro-Hot's 120 VAC Electric Heating Element, reference Figure

This procedure allows the 120 VAC Electric Heating Element to supply

heat to the Hydro-Hot's Boiler Tank. The 120 VAC Electric Heating

Elemen

t will heat the Hydro-Hot System to maixmum operating tempera-

ture

(190�F {+/- 5 deg.}) in approximately 1-2 hours. Please note the 120

VAC Electric Heating Element is the Hydro-Hot's secondary heat source

for

heating both the interior and/or the domestic hot water during low

heating demand situations (such as when moderate ambient tempera-

tures exist and/or when there is a low demand for domestic hot water).

This

feature is only operational whenever the motorhome is connected to

VAC power or when the generator is operating.

3.3 Engine Preheat Switch

Function: The Engine Preheat switch activates the indicator light on the

switch

and the Hydro-Hot's Engine Preheat Circulation Pump, reference

Figure

4. This procedure allows the Engine Preheat Circulation Pump to

circulate the engine's coolant through a separate double wall copper loop

in the Hydro-Hot's Boiler Tank, resulting in a warm engine for easy start-

ups on cool mornings. Please note that this feature will be effective only if

the Engine Preheat switch is ON in conjunction with either the Diesel and/

or Electric switch. This feature is available on HHE-200 Model Hydro-

Hot's

, ONLY.