Carrier 48LC - Economizer Control Configurations

36
POWER EXHAUST RELA
Y
TSTAT W1
OCCUPANCY --- TSTAT G
GROUND
24-V POWER
TSTAT Y3
TSTAT Y1
ECON
(2)
OFF STATUS
24-V COM
BRN
ORN
PNK
VIO
GRA
GRA
BLK
BLU
BLK
BLU
MAT
MAT
OAT
OAT
S - BUS
S - BUS
IAQ - 2 - 10
IAQ COM
IAQ 24V+
ACT - 2 - 10
ACT COM
ACT 24V+
1
2
1
2
1
2
1
2
3
1
2
3
4
WHT
BLK
GRN/ YEL
VIO
6
5
4
3
2
1
YEL
ORN
BLU
GRA
BRN
RED
6
5
4
3
2
1
SD- O/B
OCC
EXH 1
AUX
E- GND
Y2 - 1
Y1 - 1
Y1 - 0
C
R
Y2 - 0
W7220
CONTROLlER
W1
BLUEGRAY
OAT
(1)
20-K OHM
PNO HH79NZ007
SAT
20-K OHM
PNO HH79NZ007
CO
2
SENSOR
(1)
If no Enthalpy sensor connected
(2)
24V @ Y1-0 means Stage 1 mechanical cooling
C13372
Fig. 45 -- W7220 Sensor and Control I/O Connections
BRN
ORN
PNK
VIO
GRA
GRA
BLK
BLU
BLK
BLU
MAT
MAT
OAT
OAT
S - BUS
S - BUS
IAQ - 2 - 10
IAQ COM
IAQ 24V+
ACT - 2 - 10
ACT COM
ACT 24V+
1
2
1
2
1
2
1
2
3
1
2
3
4
WHT
BLK
GRN/ YEL
VIO
6
5
4
3
2
1
YEL
ORN
BLU
GRA
BRN
RED
6
5
4
3
2
1
SD- O/B
OCC
EXH 1
AUX
E- GND
Y2 - 1
Y1 - 1
Y1 - 0
C
R
Y2 - 0
W7220
CONTROLlER
W1
BLUEGRAY
1 2 3 4
ECONO
ACTUATOR
ENTHALPY
SENSOR
1 2
C12166
Fig. 46 -- Actuator/S--BUS
Economizer Control Configurations
Enthalpy Changeover Control —
Economizer changeover based on outdoor air enthalpy
requires an outdoor air enthalpy sensor to replace the OAT
sensor. The enthalpy sensor is available as a
factory--installed option or as a field--installed accessory (part
number HH57AC081). See Fig. 1 for model number
nomenclature; check Position #15 for codes N or R
indicating a factory--installed enthalpy sensor. Use Fig. 47
and Table 9 to select the enthalpy changeover setting to
enter in menu item SETPOINTS --> ENTH CURVE.
Enthalpy Settings —
When the OA temperature, enthalpy and dew point are
below the respective setpoints, the Outdoor Air can be
used for economizing. Fig. 47 shows the new single
enthalpy boundaries in the W7220. There are 5 boundaries
(setpoints ES1 through ES5), which are defined by dry
bulb temperature, enthalpy and dew point.
Refer to Table 9 for ENTH CURVE setpoint values.
48HC48LC