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Passport I/O Digital Controls Operation
Available Modes and Options for Operation
Indicator
Description/Mode
Function
Cool
The COOL mode indicator illuminates when the COOL mode is selected or when the
Passport control is in an AUTOMATIC mode cooling cycle. Only the cooling system
operates. If the ambient temperature drops below the set point, the system will not
automatically switch to the HEAT mode.
Dehumidification
DEHUMIDIFICATION mode helps control humidity. During humidity control:
• The first cycle starts 1 minute after activation.
• The fan circulates air for 30 minutes at four hour intervals.
• Air temperature is sampled and recorded.
• If necessary, a cooling cycle starts and continues until the temperature is lowered 2 °F
(1 °C) or until the cooling cycle runs a maximum of one hour.
• Four hours after the temperature is satisfied or the cooling cycle times out, the cycle
repeats.
Heat
The HEAT mode indicator illuminates when the HEAT mode is selected or when the
Passport control is in an AUTOMATIC mode heating cycle. Only the heating system
operates. If the ambient temperature rises above the set point, the system will not
automatically switch to the COOL mode.
Off
All Passport control outputs are turned OFF. The display reads OFF. All settings are saved
in non-volatile memory. To turn off the Passport control when in ON mode, press and
immediately release the
Power
button.
On
All Passport control outputs are on and the display indicates the current state of operation.
The display shows the cabin temperature. All parameters operate as set. To turn on the
Passport control when in OFF mode, press and immediately release the
Power
button.
Automatic
When in AUTOMATIC mode, the HEAT mode indicator or COOL mode indicator
illuminates to show which mode is in use. The system switches to cooling or heating as
required to satisfy the temperature set-point.
Program
See “Programming the Passport Control” on page 16.
Fan
The
Fan
button allows the user to cycle through all of the different fan speeds, which
include auto and 1–6 (1=low and 6=high). Fan speeds are automatic based on default and
programmed values. Program menu settings P-2 and P-3 determine the maximum and
minimum fan speed settings.
• The fan speed decreases as it approaches temperature set-point in COOL mode and
operates at low speed at the set point.
• The automatic fan speed operation can be reversed for HEAT mode when parameter
P-13 is set to “nor.” See “Programming the Passport Control” on page 16 for more
detail.
I
Once high and low fan speed limits are set, the Passport control automatically
readjusts the remaining fan speeds in both automatic and MANUAL FAN modes.
See “Selecting a Parameter” on page 17.
Automatic Fan
The AUTOMATIC FAN mode determines the required fan speed based on temperature
differential. This balances the most efficient temperature control with a slower, quieter fan
speed. To select AUTOMATIC FAN mode, press and release the Fan button until an “A”
appears on the display.
