Installation Manual

32
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 Two-Wire Relay Module dry contact. Refer to the furnace
literature for dehumidification options and the Two-Wire Relay Module instructions. The FK
and FV series fan coils have a terminal marked DH which should be connected to the Two-Wire
Relay Module 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
A vacation mode is set specifically for times where the home will not be occupied for an
extended period. Vacation mode is created the day your will be leaving as a continuous hold for
more than a day. While in Vacation mode, the system provides temperature and humidity
protection for the home in the selected mode, but not comfort.
Set Vacation Mode
To set vacation mode from the home screen you will use the up/dn arrows to set your desired
temperature, then the hold menu will be displayed. Use the up/dn arrows to scroll to the Hold
until time option. Set the time of day you will return using the next button and up/dn arrows.
Once the time is set the Next button will go to the date. Enter the date you will return then the
final next will take you back to the home screen. To exit vacation mode you can press any of the
Hold button and select resume schedule.
OPERATIONAL INFORMATION
Timers
Five--Minute Compressor Timeguard
This timer prevents compressor from starting unless it has been off for at least 5 minutes. It can
be overridden for 1 cycle by simultaneously pressing FAN and UP buttons.
Cycle Timer
Based on the selection of 2, 4, or 6 cycles per hour, this timer is set to 30, 15, or 10 minutes. This
much time must elapse from the start of one cycle before another cycle can start. It serves to
impose the cycles per hour limits. It can be defeated for one cycle by simultaneously pressing the
FAN and UP buttons.