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Dehumidify Output and Equipment Connections
When there is a dehumidify demand, dry contact is activated, meaning that a
24VAC signal is removed from the DHUM or DH output terminal. In other words,
dehumidify output logic is reversed - - output is turned On when no dehumidify
demand exists and is turned OFF when demand exists.
Carrier FK and FV series variable- - speed fan coils, all variable- - speed furnaces, and
select single and multi- - stage furnaces with the dehumidify connection have
dehumidify inputs which connect directly to Thermidistat Control dry contact.
Refer to the furnace literature for dehumidification options.
The FK and FV series fan coils have a terminal marked DH which should be
connected to the Thermidistat Control dry contact output. Jumper J1 on fan coil
MUST be removed. It is located behind the DH terminal. Additionally blower delay
tap on fan coil should be set to 0/0 (no On delay and no OFF delay) when using
cool to dehumidify. With this selection, the blower stops when G signal is removed,
preventing re- - evaporation of water from the coil which would occur during the
normal 90 sec blower off delay. See fan coil installation instructions for more
information.
The furnace dehumidify input acts differently depending on which style of variable
speed, select single- - stage or multi- - stage furnace control you have.
Vacation (programmable models only)
A vacation selection is available specifically for times where the home will not be
occupied for an extended period. Vacation mode has an automatic hold, meaning
that setpoints are not affected by the programmed schedule. Vacation mode is active
for a specified period of time. While in vacation mode, the system provides
temperature and humidity protection for the home in the selected mode, but not
comfort. When vacation mode is active, an arrow will be displayed beside
"VACATION" in the upper left corner of the display.
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