Nu-Air Enerboss 400C Series, Specifications, Installation, Operation And Maintenance Manual

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The HRV will be off. Both fans will be off except on call for heat or cooling. When the 
timer is turned ON the fan coil will be in high ventilation mode. The HRV fan and the 
main blower will operate in high until the switch is disengaged. 
 

Recommended Seasonal Settings 

3.5

Hot, Humid Seasons: 

3.2.5

Dehumidistat: 80% or OFF 
Thermostat: COOL, Fan Switch ON (continuous) 
 
High speed ventilation will rarely (dehumidistat at 80%) or never (dehumidistat at OFF) 
take place. The main blower will usually operate in low speed, circulating cool air 
throughout the home and introducing low levels of fresh air and expelling exhaust air 
through the ventilation system. The main blower will go into high speed with a call from 
the thermostat for cooling. Continuous ventilation is recommended for optimal air 
quality.  
 

Additional adjustment:

 If high ventilation takes place too often, switch dehumidistat to 

OFF. 
 

Cool, Cold Seasons: 

3.2.6

Dehumidistat: 40-60% 
Thermostat: HEAT, Fan Switch ON (continuous) 
 
High speed ventilation will take place when the dehumidistat set point is exceeded.  After 
the dehumidistat is satisfied, the main blower will return to low, circulating warm air 
throughout the home, while exchanging a small amount of fresh air and exhausting an 
equal amount of stale air through the ventilation system. The main blower will go into 
high speed with a call from the thermostat for heating, but ventilation rates will remain 
low. Continuous ventilation is recommended for optimal air quality.  
  

Adjusting the Dehumidistat setting:

 If high speed ventilation takes place too often, raise 

the humidity setting on your dehumidistat in 5% steps. If condensation forms on the 
windows, the dehumidistat setting should be lowered.  The dehumidistat should always 
be set higher (15%) than a humidifier if one is installed. 
 
NOTES: 
Continuous operation (Fan ON) is recommended when the suite is occupied.  
Constant air circulation results in even temperature throughout the suite, from floor to 
ceiling, from room to room. 
Improved indoor air quality (IAQ):  Constant circulation means constant ventilation. 
The ECM motor in the unit uses less than 30 watts in circulation mode and is ~ 74% 
more efficient than the commonly used PSC motor.