Lifebreath 4TONDHW(T) - Manual (Page 32)

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Operation
Heating/Cooling
When the room thermostat calls for heat, it activates a circulation pump located inside the Clean Air
Furnace. This pump delivers hot water from the water heater, through the furnace coil and back to the
water tank. Simultaneously, the furnace blower switches on to high speed and will start circulating air
across the coil, which picks up heat and delivers it to the rest of your home.
Once the thermostat's temperature is reached the pump will shut off, and the blower will return to its
pre-set speed or off.
Note: When the furnace blower is left running on low speed the air in the home circulates continuously. When
the heat is called for the blower will automatically switch to a higher speed. After the required hot air has
been delivered the blower will switch back to low speed.
When the thermostat calls for cooling (optional coil and condensing unit required) the furnace blower
activates to high speed and the outdoor condenser unit is energized. After the thermostat temperature
is reached the condensing unit will shut off, and the blower will return to its preset speed or off.
Continuous low speed can be selected on the ventilation switch at the electrical box.
Ventilation
The heat recovery ventilation (HRV) portion of the Clean Air Furnace, is automatic. Once set, a desired
amount of fresh air will be drawn into the home while the furnace blower is activated.
To reduce humidity increased ventilation may be required during heating season. An optional remote
dehumidistat can be installed. The dehumidistat will increase the speed of the furnace blower to high
and will return to its original setting when humidity levels decrease. Your dehumidistat must be
switched off during warmer months as it is not required for air conditioning operation. To increase
humidity a quality humidifier should be added to the system.
Typically the air flow for ventilation will be set to 50 - 70cfm, for low speed furnace operation, and
100 - 150cfm at high speed. The pleated furnace filter should be checked regularly and replaced as
needed. The HRV filter should be washed twice a year or more often if needed.
Optional Circulation Timer Models
Some models are equipped with a circulation timer. It is normal operation for these models to
automatically run the circulation pump for a short period of time intermittently.