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Modes of Operation
B
F
UTTON
UNCTIONS
•
Up & Down buttons (On Mode) - Simultaneously press the Up and Down buttons while in the On Mode to display the
chilled water temperature.
•
Up & Down buttons (Off Mode) - Simultaneously press the Up and Down buttons while in the Off Mode to display
outside air temperature (if the optional outside air temperature sensor is installed).
•
Up & Down buttons (Program Mode) - Simultaneously press the Up and Down buttons while in the Program Mode to
set new program defaults.
•
Fan & Down buttons (On Mode) - Simultaneously press the Fan and Down buttons while in the On Mode to blank the
display for night operation.
•
Power & Down buttons (On Mode) - Simultaneously press the Power and Down buttons while in the On Mode to
enter the Moisture Mode.
M
O
ODES OF
PERATION
O
M
FF
ODE
When the control is in Off Mode, all control outputs are turned off. Program parameters and user settings are saved in
nonvolatile memory. The Program Mode can only be accessed from the Off Mode.
O
M
N
ODE
When the control is in On Mode, power is supplied to the appropriate outputs and the display indicates the current state of
operation. The operating and program parameters resume based on those last stored when the unit was operating.
A
UTOMATIC
When Automatic Mode is selected, the system provides both heating and cooling as required. The Heat LED or Cool LED lights
indicate the mode in use. Temperature in a given mode is maintained within 2° F (1.1° C) of set point, however a 4° F (2.2° C)
difference is required for the control to change modes. Once the mode changes, temperature is maintained within 2° F (1.1° C)
of set point.
C
M
OOL
ODE
When Cool Mode is selected, the Cool LED is lit and the cooling system operates as required. If the ambient temperature drops
below the set point, the system will not automatically switch to the Heat Mode.
H
M
EAT
ODE
When Heat Mode is selected, the Heat LED is lit and the heating system operates as required. If the ambient temperature rises
above the set point, the system will not automatically switch to the Cool Mode.
M
M
OISTURE
Use Moisture Mode to help control humidity. While in the On Mode, simultaneously press the Power and Down buttons. The first
cycle starts in one minute. Every four hours, the fan circulates air for 30 minutes. During this time, the air temperature is
sampled and entered into memory. If necessary, the cooling cycle starts and continues until the temperature is lowered 2° F
(1.1° C). Four hours after the temperature is satisfied the cycle repeats. The "HU1" code displays while in Moisture Mode. Press
the Power button once to end Moisture Mode.
F
M
AN
ODES
Automatic Fan Mode
The control has six automatic fan speeds available: The fastest fan speed is "6", the slowest is "1". Automatic Fan Mode allows
the control to determine the required fan speed based on temperature differential. This permits a balance between the most
efficient temperature control and slower, quieter fan speeds. To select Automatic Fan Mode, press and release the Fan button
until the letter "A" displays.
Manual Fan Mode
There are six manual fan speeds available: The fastest fan speed is "6", the slowest is "1". Manual Fan Mode allows you to
select and maintain a desired fan speed. When a manual fan speed has been selected, the Fan LED lights. The speed level is
momentarily displayed when it is selected. Press and release the Fan button until the desired fan speed number is displayed.
Fan-Only Mode
Use the Fan-Only Mode to operate the fan for air circulation when no cooling or heating is desired. From the Off Mode press
and release the Fan button to start fan speed 1. Press and release again to increment through the other speeds. After reaching
6
- D
UAL
M
ODE
ODE
AH-Passport I/O Control Operations Manual
L-2232 ENGLISH
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Troubleshooting
