35
POWER EXHAUST RELAY
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
AUX2-I
OCC
EXH 1
AUX1-O
E- GND
Y2 - I
Y1 - I
Y1 - O
C
R
Y2 - O
W7220
CONTROLLER
W1
BLUE
GRA
Y
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
a48--- 9347
Fig. 46 -- 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
AUX2-I
OCC
EXH 1
AUX1-O
E- GND
Y2 - I
Y1 - I
Y1 - O
C
R
Y2 - O
W7220
CONTROLLER
W1
BLUE
GRA
Y
1 2 3 4
ECONO
ACTUATOR
ENTHALPY
SENSOR
1 2
a48--- 9348
Fig. 47 -- 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. 48
and Table 8 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. 48 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 8 for ENTH CURVE setpoint values.
Summary of Contents for WeatherExpert 50LC
Page 4: ...4 a50 9584 Fig 2 Unit Dimensional Drawing ...
Page 5: ...5 a50 9585 Fig 2 Unit Dimensional Drawing cont ...
Page 14: ...14 a50 9586 Fig 17 50LC 07 Electro mechanical Control Wiring Diagram ...
Page 15: ...15 a50 9592 Fig 18 50LC 07 RTU Open Control Wiring Diagram ...
Page 16: ...16 a50 9587 Fig 19 50LC 07 SystemVut Control Wiring Diagram ...