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

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When the thermostat switch is in Fan ON mode the HRV/ERV runs continuously on low 
speed, increasing to high speed on call from a timer or optional dehumidistat.  
 
When the thermostat switch is in Fan AUTO mode the HRV/ERV is in standby and will 
provide low volume ventilation only on a call for heat, or will provide high speed 
ventilation on call from an optional dehumidistat or timer .  
  

Thermostat 

3.2

The thermostat should have as a minimum two switches: 
 
A “system switch” controls the mode of operation (heat, cool or off), and a “fan switch” 
controls fan operation (On or Auto). 
 

System Switch 

3.2.1

System OFF: System does not react to heating or cooling. 
System COOL: System is in cooling mode, fan coil comes on when room temperature 
rises above set point. 
System HEAT: System is in heatign mode, fan coil comes on when room temperature 
drops below set point. 

Fan Switch 

3.2.2

FAN AUTO (intermittent operation): The Enerboss will operate with a call for heating or 
cooling or high ventilation from one of the remote controls.  Fan operation will cease and 
the unit will turn off once the call is satisfied.  Low ventilation only occurs on a call for 
heat or cool. 
   
FAN ON (continuous): The Enerboss will constantly circulate air on low speed and 
ventilate continuously in low volume. On a call for Heating or Cooling unit will go into 
high speed cooling/heating and resume low speed after the thermostat is satisfied.  On 
call from a remote control the unit will go into high speed ventilation and resume low 
speed after the remote is satisfied. This is the recommended setting for occupied spaces. 

Dehumidistat Control (Optional) 

3.3

Excessive ambient humidity can be controlled with an optional wall mounted 
dehumidistat. The dehumidistat will initiate high speed ventilation when the humidity 
sensor detects humidity in the air around it to be higher than the dehumidistat set point.  
In hi-speed ventilation the small exhaust fan will run at high speed and the main fan will 
operate at high speed. The Enerboss will cease high speed ventilation when the humidity 
sensor detects lower humidity than set point.  
 

Note: Dehumidistat settings do not need to be changed frequently; usually once 
when the weather starts to get hot and humid (late spring, early summer), and again 
when the weather starts to get cool and dry (late fall, early winter).