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12. Power Exhaust Operation
The M3 unit controller is capable of controlling up to two stages of power exhaust. The M3 unit controller configuration has
to match the power exhaust equipment installed in the roof top unit:
To enable the Power Exhaust feature in the software, set Configuration ID 1 position 3 to either S or D (whichever is
applicable).
N No power exhaust installed
S Single stage power exhaust
D Dual stage power exhaust.
To enable the Power Exhaust Control feature in the software, set Configuration ID 1 position 4 to A. See table 34 for
setting the applicable fresh air damper position for either single or two-stage exhaust operation.
Table 34. Exhaust Control
Single-Stage Exhaust Set Points (SP) Dead-band (DB)
Enabled when Input Parameter Default Parameter Default
Blower is energized. Fresh Air Damper Position 215 50% Travel 216 20% Travel*
A55_P265-12 output energizes the first stage exhaust relay when the fresh air damper position reaches 50% Travel (parameter 215) when the
blower is operating. The exhaust will de-energize when the damper position decreases 20% (parameter 216) less than the set point or when the
blower is de-energized.
Two-Stage Exhaust Set points (SP) Dead-band (DB)
Enabled when Input Parameter Default Parameter Default
Blower is energized. Fresh Air Damper Position
215 50% Travel 216 20% Travel*
219 70% Travel 220 10% Travel
* Indicates to check unit parameter label as default may be altered at factory test.
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