Heating - Lennox Prodigy 2.0 Application Manual

10.2. Heating

The discharge air control heating option automatically cycles up to four-stages of heating to maintain a discharge air control
heating set point.
•
Discharge Air Control Heating option applies to gas/electric and electric /electric units only; Discharge Air Control
Heating is not allowed with heat pumps units.
•
Refer to figure 16 for Discharge Air Control Heating heating stages.
•
Adjust Parameter 112 to 1 to enable discharge air control.
Discharge air sensor RT6 must be moved to the supply air duct, preferably after a 90 degree branch off of the main duct.
Discharge Air Control Heating is initiated by an input in one of three ways:
1. W1 input from an external device if M3 Unit Controller is configured for wired thermostat mode.
Go to SETTINGS > CONTROL > CONTROL TYPE = WIRED THERMOSTAT.
2. Heating demand while in zone sensor mode.
3. Heating demand while in L-Connection room sensor mode.
NOTE: Additional parameters can be set depending on selection choices.
H1=Heating Stage 1
H2=Heating Stage 2
H3=Heating Stage 3
H4=Heating Stage 4
Parameter 174 default is 110.0°F
Parameter 175 DACH UNOCC SETPOINT is adjusted
Parameter 177 DACH FAH STG UP TMR 3 minutes
Parameter 178 DACH FAH STG DN TMR 2 minutes
Minimum Off and Run Times Apply
Figure 16. Discharge Air Control Heating Stages - Default Values Shown
IMPORTANT
110°F + 5°F
Parameter 174 +
115
Parameter 176
OFF
114
113
OFF
112
111 H1
ON
110
109
ON
108
110°F - 2°F Diff
Parameter 174 -179
107
106
105
104
Page 54
5°F Discharge Air Control
Heating Dead-band
(All Stages Same Setting)
Parameter 176
OFF
H2
OFF
H3
ON
110°F - (2°F Diff X 2)
Parameter 174 - (Para­
meter 179 X 2)
110°F - (2°F Diff X 3)
Parameter 174 - ( Parameter 179 X 3)
H4
ON