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EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER
+
24 VAC
-
31
30
29
28
27
W7753A
UNIT
VENTILATOR
CONTROLLER
1
2
3
4
5
1
Fig. 13. Typical PWM Valve Actuator to W7753A. (For note 2, refer to Fig. 8.)
NOTE: Make sure to set the Configuration DIP Switch as shown in Fig. 13. Switches 1 through 3 set the timing of the ML7984B
valve actuator to match the W7753A outputs (0.1 sec. Min. with a max. time of 25.6 sec.).
Switch 4 determines the action of the actuator (Off = Direct Acting, On = Reverse Acting).
CHECKOUT
W7753A Checkout
Step 1. Check Installation and Wiring
Inspect all wiring connections at the W7753A terminals and
verify compliance with installation job drawings. If any wiring
changes are required, first be sure to remove power from the
controller before starting work. Pay particular attention to:
— 24 Vac power connections. Verify that multiple controllers
powered by the same transformer are wired with the
transformer secondary connected to the same input
terminal numbers on each W7753A. See Fig. 5. (Controller
configurations are not necessarily limited to three
controllers, but the total power draw including accessories
cannot exceed 100 VA when powered by the same
transformer (U.S. only). See System Engineering,
form 74-2964, for power wiring recommendations.
— Controller wiring. Be sure that each controller is wired
(terminal 1) on the W7753A to a verified earth ground
using a wire run as short as possible with the heaviest
gauge wire available, up to 14 AWG (2.0 mm
minimum of 18 AWG (1.0 mm
group. See Fig. 4.
— Verify Triac wiring to external controllers uses the proper
load power/24 Vac hot terminal (terminal 25 on the
W7753A).
NOTE: All wiring must comply with applicable electrical
codes and ordinances or as specified on installation
wiring diagrams.
95-7520—02
26
25
24
23
22
21
20
19
18
TRIAC EQUIVALENT CIRCUIT
E-BUS
6
7
8
9
10
11
12
13
14
2
2
) with a
2
) for each controller in the
ML7984B
PWM VALVE ACTUATOR
17
16
T6 T5
C
B
2
3
ON
OFF
CONFIGURATION DIP SWITCHES
(LOCATED ADJACENT TO THE
INPUT TERMINAL BLOCK)
1
EARTH GROUND WIRE LENGTH SHOULD BE HELD
TO A MINIMUM. USE THE HEAVIEST GAUGE WIRE
AVAILABLE, UP TO 14 AWG (2.O MM
2
OF 18 AWG (1.O MM
), FOR EARTH GROUND WIRE.
2
TO ASSURE PROPER ELECTRICAL CONTACT, WIRES
MUST BE TWISTED TOGETHER BEFORE INSERTION
INTO THE TERMINAL BLOCK.
15
J3
3
MAKE SURE ALL TRANSFORMER/POWER WIRING
IS AS SHOWN:REVERSING TERMINATIONS WILL
RESULT IN EQUIPMENT MALFUNCTION.
E-BUS
4
TURN POWER OFF BEFORE SETTING THE DIP SWITCHES.
31
30
29
W7753A
UNIT
VENTILATOR
CONTROLLER
1
2
3
1
1
EARTH GROUND WIRE LENGTH SHOULD BE HELD TO A MINIMUM. USE
THE HEAVIEST GAUGE WIRE AVAILABLE, UP TO 14 AWG (2.O MM
A MINIMUM OF 18 AWG (1.O MM
2
TO ASSURE PROPER ELECTRICAL CONTACT, WIRESMUST BE TWISTED
TOGETHER BEFORE INSERTIONINTO THE TERMINAL BLOCK.
Fig. 14. Typical 2 to 10 Volt DC humidity sensor to
W7753A. (For note 2, refer to Fig. 8.)
8
W
R
PWM VALVE
ACTUATOR
1 2 3 4
4
2
) WITH A MINIMUM
M12694
28
27
26
25
24
23
22
21
20
TRIAC EQUIVALENT CIRCUIT
4
5
6
7
8
9
10
11
12
C7600B
HUMIDITY
SENSOR
(2 TO 10 VOLT)
2
), FOR EARTH GROUND WIRE.
19
18
17
16
E-BUS
13
14
15
J3
2
E-BUS
2
) WITH
M12696
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