Venstar T2900 - Manual (Page 98)

Page 21.4
DEHUM JUMPER SETTING
HUM JUMPER SETTING
If the jumper for MISC1, MISC2, or MISC3 is set to HUM,
terminal on the backplate will control a humidification system. the corresponding MISC screw
Explanation of Jumper Settings
(continued)
If the jumper for MISC1, MISC2, or MISC3 is set to DEHUM,
terminal on the backplate will be connected to the dehumidification terminal of a furnace board.
NOTE: Not all furnaces have a dehumidification terminal. the corresponding MISC screw
DEHUMIDIFICATION OPERATION - Section 10
If your HVAC unit is equipped with a dehumidification system the thermostat will
operate in one of two ways.
HUMIDIFICATION OPERATION - Section 9
21
If your HVAC unit is equipped with a humidification system the thermostat will
provide power to the MISC1, MISC2, or MISC3 terminal of the thermostat when
the humidity in the home falls below the humidity setpoint you have chosen.
The value for this setpoint ranges from 0% to 60%. If no humidity is desired
or if a humidification system has not been installed, set the value to 0%.
2) Normally Open (NO): The thermostat will energize the MISC1, MISC2, or
MISC3 terminal of the thermostat (this MISC terminal is connected to the
DEHUM terminal on your furnace) to allow the fan to run in low speed when
the humidity in the home is above the dehumidify setpoint you have chosen
and there is a call for 1st stage cooling.
1) Normally Closed (NC): The thermostat will de-energize the MISC1, MISC2,
or MISC3 terminal of the thermostat (this MISC terminal is connected to the
DEHUM terminal on your furnace) to allow the fan to run in low speed when
the humidity in the home is above the dehumidify setpoint you have chosen
and there is a call for 1st stage cooling.