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26
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ERV Wheel Off
Supply Blower Off
Exhaust Blower Off
2-Pos Motor Closed
Wheel Maintenance Indicator Off
Supply Blower Maintenance Indicator Off
Exhaust Blower Maintenance Indicator Off
ERV Wheel On
Supply Blower Off
Exhaust Blower On
2-Pos Motor Open
Wheel Maintenance Indicator On
Supply Blower Maintenance Indicator Off
Exhaust Blower Maintenance Indicator On
ERV Wheel Modulating
Supply Blower On
Exhaust Blower On
2-Pos Motor Open
Wheel Maintenance Indicator On
Supply Blower Maintenance Indicator On
Exhaust Blower Mainten
ance Indicator On
ERV Wheel Stop/Jog
Supply Blower Off
Exhaust Blower On
2-Pos Motor Open
Wheel Maintenance Indicator On
Supply Blower Maintenance Indicator Off
Exhaust Blower Maintenance Indicator On
ERV Wheel Stop/Jog
Supply Blower On
Exhaust Blower On
2-Pos Motor Open
Wheel Maintenance Indicator On
Supply Blower Maintenance Indicator On
Exhaust Blower Maintenance Indicator On
ERV Wheel On
Supply Blower On
Exhaust Blower On
2-Pos Motor Open
Wheel Maintenance Indicator On
Supply Blower Maintenance Indicator On
Exhaust Blower M
aintenance Indicator On
Preheat available if
pressure or temperature
are correct for usage
Low Temp
Lock Out
Option 51
Lockout
Activated
HVAC Supply Fan On
or ERV Timer Option Active
or Stand Alone Short
Pins 31 to 30 and 29 to 28
CO2 Level
Not High
Enough in
Space
Economizer
Full Open
End Switch
Frost Option
Wheel Iced
Frost Option
Wheel Iced
VFD
ERV Power
Exhaust
Mode
Free Cooling
Dry Bulb Enthalpy
Option and W1
and G a
re Off
Fig. 24 — ERV Sequence of Operation
a62-540