Unit installation

12
Remote Occupancy
The remote occupancy input is provided on the field connection
terminal board (TB). The Remote Occupancy Switch
configuration, Configuration→UNIT→RM.SW, identifies the
normally open or normally closed status of this input when
unoccupied.
S RMOC = 24 VAC signal input
S R--2 = 24 VAC source for dry contact
Fire Shutdown
The fire shutdown input is provided for unit shutdown in response
to a fire alarm or smoke detector. The Fire Shutdown Switch
configuration, Configuration→UNIT→FS.SW, identifies the
normally open or normally closed status of this input when there is
no fire alarm.
S FDWN = 24 VAC signal input
Alarm Output
The alarm output is provided on the field connection terminal
board to indicate a current alarm status. The output will be 24VAC
if a current alarm exists.
S C--2 = 24 VAC common
S X = 24 VAC signal output
Economizer Damper Control
For units with the economizer option or accessory and the ECB
control board, the damper position can be directly controlled
through the IAQ sensor input provided on the field connection
terminal board. The IAQ Analog Input configuration,
Configuration→AIR.Q→IA.CF will have to set to 3 (Control
Minimum Position). When IA.CF = 3, an external 4 to 20 mA
source is used to move the damper 0% to 100% directly.
IAQ = 4--20mA + signal
COM = 4--20mA -- common
NOTE: In this mode, preset minimum positions configurations are
not valid, the damper position may exceed the input position to
provide economizer cooling and CO
2
sensor input can not be used
for DCV control. Refer to the Indoor Air Quality operation section
for more information.
CONTROLS OPERATION
Display Configuration
The Configuration→DISP submenu is used to configure the local
display settings.
Metric Display (METR)
This variable is used to change the display from English units to
Metric units.
Language Selection (LANG)
This variable is used to change the language of the ComfortLink
display. At this time, only English is available.
Password Enable (PROT)
This variable enables or disables the use of a password. The
password is used to restrict use of the control to change
configurations.
Service Password (PSWD)
This variable is the 4-digit numeric password that is required if
enabled.
Test Display LEDs (TEST)
This is used to test the operation of the ComfortLink display.
Unit Configuration
Many configurations that indicate what factory options and/or field
accessories are installed and other common operation variables are
included in Unit Configuration (Configuration→UNIT). These
configurations will be set in the factory for the factory--installed
options (FIOPs). Field--installed accessories installed will require
configuration changes. General unit configurations are also
covered under this Unit Configuration menu.
Start--Up Delay (S.DLY)
This configuration sets the control start-up delay after the power is
interrupted. This can be used to stagger the start-up of multiple
units.
Unit Control Type (U.CTL)
This configuration defines if temperature control is based on
thermostat inputs or space temperature sensor input.
S U.CTL = 2 (Thermostat) – The unit determines cooling and
heating demand by the state of G, Y1, Y2, W1, and W2 inputs
from a space thermostat. This value is the factory default.
S U.CTL = 3 (Space Sensor) – The unit determines cooling and
heating demand based on the space temperature and the
appropriate set point. Used also as Linkage configuration. The
jumper wire in the installer’s packet must be connected between
R and W1 on the low voltage terminal board for heating mode to
operate.
Thermostat Control Type (T.CTL)
This configuration applies only if Unit Control Type is Thermostat
(Configuration→Unit→U.CTL = 2). The value determines
alternative system staging. See the specific operation sections for
more information. The factory default value is T.CTL =0
(Adaptive).
Fan Status Switch (FN.SW)
This configuration identifies if a fan status switch is installed, and
what status (normally open, normally closed) the input is when the
indoor fan is OFF.
Filter Status Switch (FL.SW)
This configuration identifies if a filter status switch is installed, and
what status (normally open, normally closed) the input is when the
filter is CLEAN.
Fire Shutdown Switch (FS.SW)
This configuration identifies if a fire shutdown switch is installed,
and what status (normally open, normally closed) the input is when
the fire or smoke alarm is OFF (no alarm).
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