Carrier 50HJ012 - Enthalpy Sensors and Control; Fig. 21 - Typical PremierLink Controls Wiring; Fig. 22 - Outdoor and Return Air Sensor Wiring Connections for Differential Enthalpy Control

17
Enthalpy Sensors and Control
— The enthalpy control
(HH57AC077) is supplied as a field-installed accessory to be
used with the EconoMi$er2 damper control option. The out-
door 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.
NOTE: The enthalpy control must be set to the “D” setting for
differential 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. Locate the controller in place of an existing econo-
mizer controller or near the actuator. The mounting plate may
not be needed if existing bracket is used.
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.
Outdoor Air Enthalpy Sensor/Enthalpy Controller
(HH57AC077) — To wire the outdoor air enthalpy sensor,
perform the following (see Fig. 22 and 23):
NOTE: The outdoor air sensor can be removed from the back
of the enthalpy controller and mounted remotely.
1. Use a 4-conductor, 18 or 20 AWG cable to connect the
enthalpy control to the PremierLink controller and power
transformer.
2. Connect the following 4 wires from the wire harness
located in rooftop unit to the enthalpy controller:
a. Connect the BRN wire to the 24 vac terminal (TR1)
on enthalpy control and to pin 1 on 12-pin harness.
b. Connect the RED wire to the 24 vac GND terminal
(TR) on enthalpy sensor and to pin 4 on 12-pin
harness.
c. Connect the GRAY/ORN wire to J4-2 on Premier-
Link controller and to terminal (3) on enthalpy
sensor.
d. Connect the GRAY/RED wire to J4-1 on Premier-
Link controller and to terminal (2) on enthalpy sensor.
NOTE: If installing in a Carrier rooftop, use the two gray wires
provided from the control section to the economizer to connect
PremierLink controller to terminals 2 and 3 on enthalpy sensor.
Return Air Enthalpy Sensor
— Mount the return-air enthalpy
sensor (HH57AC078) in the return-air duct. The return air
sensor is wired to the enthalpy controller (HH57AC077). The
outdoor enthalpy changeover set point is set at the controller.
To wire the return air enthalpy sensor, perform the follow-
ing (see Fig. 22):
1. Use a 2-conductor, 18 or 20 AWG, twisted pair cable to
connect the return air enthalpy sensor to the enthalpy
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.
TB-1
R
Y1
Y2
W1
W2
G
C
X
1
2
3
4
5
6
7
8
TB-3
1
2
3
4
5
6
7
8
TB-2
1
2
3
4
5
6
7
8
J6
ANAL OG
J5
0-20mAIN
J4
DISCRETE
J1
PWR
J2
COMMS
J9
0-20 mA
J8
Relays
HK50AA0
39
BRN
BRN
WHT
WHT
RED
PNK
PNK
ORNORN
ORN
ORN
GRA
GRA
ORN
RED
J7
PP/MP
WHT
BLK
RED
RED
PNK
WHT
BLK
PNK
WHT
BLU
ORN
YEL
GRN
BRN
BRN
RED
RED
BRN
BRN
BLK
BLK
BRN
BRN
BLU
BLU
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
PNK
PNK
VIO
VIO
GRA
ORN
PNK
PNK
GRA
GRA
GRA
SAT
BRN
ORN
BLK
RED
Space Temp./ Set
Point Adjustment
Indoor Air
Quality Sensor
OAT
PNK
VIO
YEL
YEL
BLU
BLU
Economi$er2
4 - 20mA
BLK
RED
WHT
PremierLink
GRN
YEL
BLU
BLU
BLU
Outdoor Air
Quality Sensor
Power Exhaust/Energy Recycler
CCN
Com
m.
RMTOCC
SFS
CMPSAFE
FSD
RTU Terminal
Board
TR
TR1
SR
2
3
+
+
S
RED
BRN
BLK
RED
GRAY
GRAY
OUTDOOR AIR
ENTHALPY SENSOR
RETURN AIR
ENTHALPY
SENSOR
LEGEND
COMMS — Communications
OAT — Outdoor Air Temperature Sensor
PWR — Power
RTU — Rooftop Unit
SAT — Supply Air Temperature Sensor
TB — Terminal Block
Fig. 21 — Typical PremierLink™ Controls Wiring