Operation
Heating/Cooling
When the room thermostat calls for heat, the furnace blower switches on to heating speed and will start circu- lating 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 ele- ments will shut off, and the blower will return to its
Note: When the furnace blower is left running on low speed the air in the home circulates continu- ously. 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 A coil and condensing unit required) the furnace blower acti- vates 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 low speed. Continuous low speed is selec- table, (fig. 6).
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 fur- nace blower is activated.
To reduce humidity increased ventilation may be required. 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 dehumidis- tat 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 sys- tem.
Typically the air flow for ventilation will be set to 50 - 7 0 c f m , f o r l o w s p e e d f u r n a c e o p e r a t i o n , a n d 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.
Figure 6
Low speed selection switch (PCS motor models only)
(CONTINUOUS or OFF)
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