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EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
74-2958—138
Fig. 27. Typical W7750A Controller AHU application
wiring diagram. (For more information on note 2,
refer to Fig. 25.)
Fig. 28. Typical W7750A Controller with separate
transformer application wiring diagram.
(For more information on note 2, refer to Fig. 25.)
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1
3
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.
LOAD POWER WIRE CAN BE CONNECTED TO TERMINAL 22.
LONWORKS-BUS
EARTH
GROUND
JACK FOR
L
ONWORKS-BUS
NETWORK
ACCESS
7 654321
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
WALL MODULE
SET PT
AI
GROUND
AI
GROUND
DI
GROUND
DI
GROUND
SENSOR
BYPASS
LED
LON
JACK
L
ONWORKS
BUS
NOT USED
9 8
19 18 17 16
AI-1 OHM
DI- 1
DI- 2
13
TIME CLOCK
M10085C
DISCHARGE
AIR TEMP
24 VAC
24 VAC COM
Rc
Rh
W1
W2
Y1
Y2
G
NOT USED
24 VAC
+
-
LOAD AND
CONTROLLER
POWER
FAN
COMP2COMP 1
HEAT 2HEAT 1
W7750A
CONSTANT
VOLUME AHU
CONTROLLER
NETWORK
DO
12345678
W7750A
CONSTANT
VOLUME AHU
CONTROLLER
1
2
2
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.
L
ON
W
ORKS
-BUS
EARTH
GROUND
JACK FOR
L
ON
W
ORKS
-BUS
NETWORK
ACCESS
7 69 8 54321
T7770C
WALL
MODULE
SET PT
GND
SENSOR
BYPASS
LED
E-BUS
E-BUS
9101112 14 J315
31 30 29 28 27 26 25 24 23 22 21 20
WALL MODULE
SET PT
SENSOR
BYPASS
LED
NOT USED
19 18 17 16
AI-1 OHM
DI- 1
DI- 2
13
TIME CLOCK
M10084C
DISCHARGE
AIR TEMP
24 VAC
24 VAC COM
Rc
Rh
W1
W2
Y1
Y2
G
NOT USED
24 VAC
24 VAC LINE AC
+
-
CONTROLLER POWER
LOAD POWER
FAN
COMP2COMP 1
HEAT 2HEAT 1
H
C
NETWORK
DO
AI
GROUND
AI
GROUND
DI
GROUND
DI
GROUND
L
ON
JACK
L
ON
W
ORKS
BUS