39
PremierLink Configuration screen for Operating Mode.
Default setting is Sensor Mode (value 1). Change the
value to 0 to reconfigure the controller for Thermostat
Mode.
When the PremierLink is configured for Thermostat
Mode, these functions are not available: Fire Shutdown
(FSD),Remote Occupied (RMTOCC), Compressor Safety
(CMPSAFE), Supply Fan Status (SFS), and Filter Pressure
Switch (FILTER).
Economizer controls —
Outdoor Air Enthalpy Control (PNO HH57AC077) --
The enthalpy control (HH57AC077) is available as a
field--installedaccessory to be used with the EconoMi$er2
damper system. The outdoor air enthalpy sensor is part of
the enthalpy control. (The separate field--installed
accessory return air enthalpy sensor (HH57AC078) is
required for differential enthalpy control. See below.)
Locate the enthalpy control in the economizer hood.
Locate two GRA leads in the factory harnessand connect
these leads to enthalpy control sensors 2 and 3. See Fig.
48. Connect the enthalpy control power input terminals to
economizer actuator power leads RED (connect to TR)
and BLK (connect to TR1).
67LCTBECON32EnthalpySwitchGRAGRAFactory Wiring Harness
C08218
Fig. 48 --Enthalpy Switch (HH57AC077) Connections
The outdoor enthalpy changeover setpoint is set at the
enthalpy controller.
The enthalpy control receives the outdoor air enthalpy
from the outdoor air enthalpy sensor and provides a dry
contact switch input to the PremierLink controller. A
closed contact indicatesthat outside air is preferred to the
return air. An open contact indicatesthat theeconomizer
should remain at minimum position.
Differential Enthalpy Control — Differential enthalpy
control is provided by sensing and comparing the outside
air and return air enthalpy conditions. Install the outdoor
air enthalpy control as described above. Add and install a
return air enthalpy sensor.
Return Air Enthalpy Sensor — Mount the return--air
enthalpy sensor (HH57AC078) in the return--airduct. The
return air sensor is wired to the enthalpy controller
(HH57AC077). See Fig. 49.
LED
ABC
D
TR TR1
SO
SR
2
3
1
+
+
BRN
RED
GRAY/ORN
GRAY/RED
WIREHARNESS
INUNIT
BLK
RED
S
+
(RETURNAIR
ENTHALPY
SENSOR)
S
+
(OUTDOOR
AIR
ENTHALPY
SENSOR)
ENTHALPYCONTROLLER
NOTES:
1. Remove factory-installed jumper across SR and + before connecting
wiresfrom return airsensor.
2. Switches shown in high outdoor air enthalpy state. Terminals 2 and 3
closeon low outdoor air enthalpy relative to indoor air ent halpy.
3. Remove sensor mounted on back of control and locate in outside air-
stream.
C06019
Fig. 49 --O utside and Return Air Enthalpy Sensor
Wiring
To wire the return air enthalpy sensor, perform the
following:
1. Use a 2--conductor,18 or 20 AWG, twisted pair cable
to connect the return air enthalpy sensor to the enthal-
py controller.
2. At the enthalpy control remove the factory--installed
resistor from the (SR) and (+) terminals.
3. Connect the field--supplied RED wire to (+) spade
connector on the return air enthalpy sensor and the
(SR+) terminal on the enthalpy controller. Connect
the BLK wire to (S) spade connector on the return air
enthalpy sensor and the (SR) terminal on the enthalpy
controller.
NOTE: The enthalpy cont rol must be set to the “D”
setting fordifferential enthalpy control to work properly.
The enthalpy control receives the indoor and return
enthalpy from the outdoor and return air enthalpy sensors
and provides a dry contact switch input to the
PremierLink controller. A closed contact indicates that
outside air is preferred to the return air. An open contact
indicates that the economizer should remain at minimum
position.
Indoor Air Quality (CO2sensor) — The indoor air quality
sensor accessory monitors space carbon dioxide (CO2)
levels. This information is used to monitor IAQlevels.
Several types of sensors are available, for wall mounting
in the space or in return duct, with and without LCD
display, and in combination with space temperature
sensors. Sensors use infrared technology to measure the
levels of CO2presentin the space air.
The CO2sensors are all factory set for a range of 0 to
2000 ppm and a linear mA output of 4 to 20. Refer to the
instructions supplied with the CO2sensor for electrical
48TC