35
POWER EXHAUST RELA
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
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
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
BLUEGRAY
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 s ensor is available as a
factory--installed option or as a field--installed accesso ry (part
number HH57AC081). See Fig. 1 for model number
nomen clatur e; check Pos itio n #1 5 for cod es N or R
indicating a factor y--installed enthalpy senso r. Use F ig. 48
and Table 8 to select the enthalp y changeover setting to
enter in menu item SETPO I N TS --> ENTH CU RVE.
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 bounda ries i n the W7220. T here are 5 boundari es
(setpoints ES1 through ES5), which are defined by dry
bulb t emperature, enthalpy and dew point.
Refer to Table 8 for ENTH CURVE setpoint va lues.
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