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EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
74-2958—134
Fig. 21. NEMA class 2 transformer voltage output limits.
Attach earth
g
round to W7750 Controller terminal 1. See Fi
g
.
22, 23 and 24, 27 throu
g
h 35.
Fig. 22. Power wiring details for one Excel 10 per
transformer.
See Fi
g
. 23. for wirin
g
more than one Excel 10 per
transformer.
Fig. 23. Power wiring details for two or more Excel 10s per transformer.
IMPORTANT
If the W7750 Controller is used on
Heating and
Cooling Equipment (UL 1995 U.S. only
)
devices
and the transformer primary power is more than 150
volts, connect the transformer secondary to earth
ground, see Fig. 24.
27
26
25
24
23
22
21
20
19
18
17
16
15
14
0 50 100 150
% OF LOAD
SECONDARY VOLTAGE
200
M993
M10089B
CONNECT POWER TO
TERMINALS 24 AND 25
TRIAC LINES
TO ACTUATORS
AND CONTACTORS
TRANSFORMER
W7750B,C
EARTH
GROUND
2022
24
25
1
OUTPUT
DEVICE
POWER
M10090A
24 VAC
120/240 VAC
TRANSFORMER
W7750B,C
EARTH
GROUND
24
25
1
W7750B,C
EARTH
GROUND
24
25
1
W7750B,C
EARTH
GROUND
24
25
1