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Energy Recovery (Optional)
The Energy Recovery (Enthalpy) Wheel is assembled and installed from the factory. Minimal maintenance
will provide years of trouble-free service.
If the unit is equipped with the optional enthalpy wheel, energy recovery is provided by pulling outside air
across half of the wheel and moving exhaust air across the other half. Latent heat and sensible heat are
moved from the hotter and moist exhaust air to the colder and dry outside air during winter conditions.
Latent heat and sensible heat are transferred from the hotter and moist outside air to the cooler and dry
exhaust air during summer conditions. Enthalpy control comprises of starting and stopping the exhaust
fan, modulating the speed of the exhaust fan, starting and stopping the enthalpy wheel, and optionally
controlling the speed of the enthalpy wheel. If required by outdoor air conditions, the outdoor damper is
controlled in the normal manner.
provides details for components associated with the enthalpy
wheel.
Figure 42 - Energy Recovery Wheel Overview
Purge and Pressurization
Pressurization is critical to minimize crossover from exhaust to supply and to allow the purge to operate
properly. Move the adjustable purge plate (
) up to increase purge and minimize crossover.
Figure 43 - Purge Details
1. Outdoor Air Filtration
2. Energy Wheel
3. ERV Controls
4. Return/Exhaust Filtration
5. ECM Exhaust Fan
Outdoor Air
Supply Air
Return Air
Exhaust Air
Purge
1
3
4
2
5
Adjustable purge plate.
