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14. Discharge Air Control
14.1. Cooling
The discharge air control cooling option automatically cycles up to 4-stages of cooling to maintain a discharge air control
cooling set point.
When an economizer is installed, adjust free cooling set point parameter 159 approximately 2 degrees lower than
Discharge Air Control Cooling set point. This will allow free cooling to operate before Discharge Air Control Cooling
energizes compressors.
Refer to figure 13 for Discharge Air Control Cooling cooling stages.
Adjust parameter 111 to option 4 to enable discharge air control cooling.
NOTE
: Discharge air control as described here is not support on Energence Ultra-High Efficiency 3 to 6-ton units.
IMPORTANT
Discharge air sensor RT6 must be moved to the supply air duct, preferably after a 90 degree branch of the main duct.
Discharge Air Control Cooling is initiated by an input in one of three ways:
1. Y1 input from an external device— If the M3 unit controller is configured for wired thermostat.
Go to
SETTINGS > CONTROL > CONTROL TYPE = WIRED THERMOSTAT.
2. Cooling demand while in RTU STANDALONE mode:
Go to
SETUP > NETWORK INEGRATION > NETWORK = RTU STANDALONE > OCC BLOWER MODE = >
BACK UP MODE = >
and continue to answer questions concerning heating and cooling set points.
3. Cooling demand while in room sensor mode:
Go to
SETUP > NETWORK INEGRATION > NETWORK =
(L CONNECTION, LONTALK OR BACNET)
>
any
additional network settings
> CONTROL MODE = ROOM SENSOR >
and continue to answer questions concerning
network sensor type, OCC blower mode and backup mode.