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EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
74-2958—142
Fig. 34. W7750B,C wiring diagram with C7600C 4 to 20 mA
solid state humidity sensor. (For more information on
note 2, refer to Fig. 25.)
Fig. 35. W7750C Controller with 4-to-20 mA heating,
cooling and economizer wiring diagram. AOs must use
terminals 16, 17 or 18. The AOs can be set to be reverse
acting. (For more information on note 2, refer to Fig. 25.)
See Fi
g
. 36 or 37 to wire a pneumatic transducer to a
W7750B or W7750C.
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24 VAC
24 VAC
W7750B CONSTANT
VOLUME AHU
CONTROLLER
1
2
2
1
2
3
EARTH GROUND WIRE LENGTH SHOULD BE HELD TO A MINIMUM.
USE THE HEAVIEST GAUGE WIRE AVAILABLE, UP TO 14 AWG (2.O MM
2
)
WITH A MINIMUM OF 18 AWG (1.O MM
2
), FOR EARTH GROUND WIRE.
TO ASSURE PROPER ELECTRICAL CONTACT, WIRES MUST BE TWISTED
TOGETHER BEFORE INSERTION INTO THE TERMINAL BLOCK.
WIRING DIAGRAM SHOWS JUMPER (FOR J2) IN FACTORY DEFAULT
HIGH-SIDE POSITION.
EARTH
GROUND
7 69 8 54321
T7770C
WALL
MODULE
SET PT
GND
SENSOR
BYPASS
LED
E-BUS
E-BUS
9 101112 14 J315
31 30 29 28 27 26 25 24 23 22 21 20
24 VAC COM
WALL MODULE
SET PT
GROUND
SENSOR
BYPASS
LED
20 VDC OUT
19 18 17 16
AI-1 OHM
GROUND
GROUND
AI-2 OHM
AI-4 V/mA
+
-
OUT 7
OUT 6
OUT 5
OUT 4
OUT 8
OUT 1
OUT 3
OUT 2
AI-3 V/mA
13
DI-2
DI-4
DI-1
DI-3
DI
GROUND
OCCUPANCY SENSOR
(CONTACTS CLOSED
EQUALS OCCUPIED)
WIND
O
W
S
CO
NTA
C
T
S
(CONTACTS CLOSED
EQUALS WINDOW
CLOSED)
M11619B
DI
GROUND
TRIAC EQUIVALENT CIRCUIT
+
–
C7600C
HUMIDITY
(4 TO 20 MA)
LONWORKS
BUS
L
ON
JACK
L
ONWORKS-BUS
JACK FOR
L
ONWORKS-BUS
NETWORK
ACCESS
3
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24 VAC
W7750C CONSTANT
VOLUME AHU
CONTROLLER
1
2
2
3
1
2
EARTH GROUND WIRE LENGTH SHOULD BE HELD TO A MINIMUM.
USE THE HEAVIEST GAUGE WIRE AVAILABLE, UP TO 14 AWG (2.O MM
2
)
WITH A MINIMUM OF 18 AWG (1.O MM
2
), FOR EARTH GROUND WIRE.
TO ASSURE PROPER ELECTRICAL CONTACT, WIRES MUST BE TWISTED
TOGETHER BEFORE INSERTION INTO THE TERMINAL BLOCK.
IF AN ANALOG OUTPUT DEVICE HAS A SIGNAL COM (-) TERMINAL,
CONNECT IT TO THE 24 VAC COM TERMINAL NUMBER 24.
LONWORKS-BUS
EARTH
GROUND
JACK FOR
L
ONWORKS-BUS
NETWORK
ACCESS
7 69 8 54321
T7770C
WALL
MODULE
SET PT
GND
SENSOR
BYPASS
LED
E-BUS
E-BUS
9 101112 14 J315
31 30 29 28 27 26 25 24 23 22 21 20
24 VAC COM
WALL MODULE
SET PT
SENSOR
BYPASS
LED
20 VDC OUT
19 18 17 16
AI-1 OHM
AI-2 OHM
AI-4 V/mA
AO 2
AO 1
OUT 5
OUT 4
AO 3
OUT 1
OUT 3
OUT 2
AI-3 V/mA
13
DI-2
DI-4
DI-1
DI-3
M16417B
TRIAC EQUIVALENT
CIRCUIT
DISCHARGE
AIR TEMP
24 Vac
+
++
-
-
3
SERIES 70
VALVE
ACTUATOR
ML7161
4-20
mA
2-10
V
24
Vac
COM
24
Vac
T1
IN-
PUT
COM
SERIES 70
VALVE
ACTUATOR
24
Vac
IN-
PUT
COM
ECONOMIZER
DAMPER
TWO - OR
THREE-WAY
HOT WATER/
STEAM VALVE
TWO - OR
THREE-WAY
CHILLER
WATER VALVE
FAN
T2
DI
GROUND
DI
GROUND
AI
GROUND
AI
GROUND
AI
GROUND
LON
JACK
L
ONWORKS
BUS