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EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
74-2958—140
Fig. 30. Typical W7750B Controller with staged heating
and cooling wiring diagram. (For more information on
note 2, refer to Fig. 25.)
Fig. 31. W7750B Controller with floating heating, cooling
and economizer wiring diagram. (For more information on
note 2, refer to Fig. 25.)
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24 VAC
W7750B CONSTANT
VOLUME AHU
CONTROLLER
1
2
2
1
2
3
4
3
4
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.
ISOLATING RELAYS MUST BE USED WHEN CONNECTING TO STAGED
HEAT/COOL EQUIPMENT.
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
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
M10082D
DI
GROUND
TRIAC EQUIVALENT CIRCUIT
24 VAC
+
-
HEAT
STAGE 1
HEAT
STAGE 2
COOL
STAGE 1FAN
COOL
STAGE 2
COOL
STAGE 3
COOL
STAGE 4
AI
GROUND
AI
GROUND
AI
GROUND
LON
JACK
L
ONWORKS
BUS
12345678
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.
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
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
M10081C
TRIAC EQUIVALENT CIRCUIT
DISCHARGE
AIR TEMP
24 VAC
+
-
SERIES 60
VALVE ACTUATOR
SERIES 60
ACTUATOR
CW COM CCW
COM
STEM
UP
STEM
DOWN
SERIES 60
VALVE ACTUATOR
COM
STEM
UP
STEM
DOWN
ECONOMIZER
DAMPER
TWO - OR THREE-WAY
HOT WATER/STEAM VALVE
TWO - OR THREE-WAY
CHILLER WATER VALVE
3
DI
GROUND
DI
GROUND
AI
GROUND
AI
GROUND
AI
GROUND
LON
JACK
L
ONWORKS
BUS