Third-Party Digital Output To Control Dehumidification; Outside Air For Dehumidification - Lennox Prodigy 2.0 Application Manual

6.3. Third Party Digital Input to Control Dehumidification
1. Go to SETUP > INSTALL. Set Configuration ID1, position 1 to H for Humiditrol option. Follow the wizard until sensor
type option is prompted and select REHEAT DI4.
2. An alternate method is to
Go to SETTINGS > RTU OPTIONS > DEHUMIDIFIER. For SENSOR TYPE, select REHEAT DI4. This method will
only work if Configuration ID 1, position 1 is set correctly.
REHEAT DI4 is digital input 4 that is for Humiditrol or third-party products (see figure 7).
USE 24 VAC (R) FROM ANY OF
THE AVAILABLE: P299-2, -5, OR -7
6.4.

Outside Air For Dehumidification

The M3 Unit Controller has an option that allows "fresh air tempering control" heated outside air to be used to dehumidify
when outside air temperature is low.
dehumidification instead of the compressor.
Parameter 168. Additional conditions for operation apply (see table 19).
Parameter 313
(Options)
0 Disabled.
1 Allowed, must be occupied.
2 Allowed, blower must be energized and in occupied mode.
3 Allowed. No conditions apply.
The M3 Unit Controller will use the gas or electric heat to temper discharge air and the outside air will be used to dehumidify
(when there is a dehumidification demand and outside air is cool). Adjust the following settings:
•
Parameter 166 - Fresh Air Heating Control Reheat Outdoor Air Temperature set point default setting of 45.0°F.
•
Parameter 167 - Fresh Air Heating Control Reheat Damper position default setting is 40%.
•
Parameter 168 - Fresh Air Heating Control Reheat Set Point default setting is 40.0°F)
•
Fresh Air Reheat Mode can be adjusted also through the user interface.
NOTE - The below menu option is only available if a economizer or motorized outside air damper is installed and enabled
using Configuration ID 1, position 2. That position needs to be set to one of these options (M, T, G, S or D).
Go to SETUP > TEST & BALANCE > DAMPER > (Note: There several settings to select in this path before reaching
the desired setting ) FRESH AIR HEATING ENABLE FAH = YES or NO.
Parameter 313 (FAH REHEAT MODE) can also be used along with Parameter 105 (DEHUMID MODE) options 2 through 7.
Do not use option 1.
Figure 7. REHEAT DI14 Diagram
When Parameter 313 is set to options 1 ­ 3
Fresh Air Heating starts when the outside air temperature is <= the set point
Table 19. Outside Air for Dehumidification Conditions
Outside Air Dehumidification Conditions
Page 28
R
7
D
DI-4
8
C
9
10
(see table 19), outside air will be used for