Lifebreath CAF-02-MB Bedienungsanleitung PDF herunterladen (Seite 6)

Call for Space Heating Only

Operation

When the thermostat calls for heat, the

circulation pump is activated and hot water is

drawn from the top of the water heater through

the air handler, and then returned to the water

heater. There should be at least a 20˚F (11˚C)

temperature drop between the hot water

supplied to the air handler and the returning

water temperature. If the temperature drop is less

then 20˚F (11˚C) two things may happen:

1. Mixing of warm return water with the hot

water within the water heater (no tank

stratification), which will result in a lower hot

water supply temperature.

2. A water heater thermostat temperature

differential (between on and off) is approximately

18˚F (10˚C). Therefore, if the return water is not

cool enough, it may not activate the water heater

thermostat, which causes the burner to operate.

All of the water in the water heater will be cooled

before the burner begins to operate. This may

cause large swings in the delivered hot water

temperature, causing poor space heating

performance, fluctuating domestic water

temperatures and effectively reducing the supply

of domestic hot water.

Call for Domestic Hot Water and

Space Heating Operation

When both return water from the space heating

loop and new cold water (replacing domestic

water being used) enters the water heater, the

mixed entering water is cool enough to activate

the thermostat quickly. In this situation, the water

heater must be capable of satisfying the

combined need for hot water (domestic hot water

and space heating) at the same time.

Air System

A circulation fan draws cool house air at approx.

70˚F (21˚C) from the return ductwork, forces

it through the water coil where it is heated, and

then distributes it to the various rooms of the

house through the supply ductwork.

Water Piping

The Piping and fittings used to connect the water

heater and air handler must be sized to handle

the volume of hot water required by the air

handler within the pressure limitations of the

circulation pump. All piping, fittings solders, and

fluxes must be acceptable for use with domestic

hot water.

Note: Chemicals (such as boiler system additives)

cannot be added to the system because water

passing through the heating loop re-enters the

domestic water systems.

Circulation Pump

The circulation pump is factory installed within

the air handler. The water flow rate will vary

depending on the pumps performance and

the head pressure (resistance) of the complete

heating loop system.

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Lifebreath CAF-02-MB Bedienungsanleitung Seite 6

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