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4 Start Up / Test

Fill the hot water tank by turning on the water pressure pump and opening a hot water tap to

allow air to bleed out of the hoses and/or plumbing.

Check the drain and pressure relief valve by turning the knob counterclockwise one notch. Wa-

ter will flow into the drain hose. Make sure the drain hose is not blocked or closed. Turn the

knob counterclockwise again and the valve will close.

Start the engine to check the circulation of the coolant. It will be necessary to add coolant to

the system to compensate for the additional volume of the exchanger and hoses. Check for air

locks in the connecting hoses and raise and lower these as necessary to clear the air from the

hoses before securing the hoses in place.

Lastly plug in the tank and tur n on the circuit breaker. Check for proper operation.

Fig. 5

When there is a risk of freezing the tank must

be drained. This is done by opening the air

bleeder screw mounted on the mixing valve

(Fig. 5) and opening the drain valve by turning

the relief valve knob counterclockwise one

notch (Fig. 6).

If the engine is raw-water cooled the heat ex-

changer must also be drained by removing the

hoses and blowing air into the coils to drain

any water.

The tank can now be safely left in the vessel

over the winter.

Fig. 6

Double Heat Exchanger Water Heaters (Model

404R) have connections for second heat ex-

changer located on the back (Fig. 7).

Fig. 7