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EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
19 74-2958—1
Outdoor Air Humidity (W7750B,C
only):
T
y
pe: Volta
g
e/Current.
Supported Sensors: C7600B1000 and C7600B1018
(
2 to 10V
)
, C7600C1008
(
4 to 20mA
)
.
Return Air Humidity (W7750B,C
only):
T
y
pe: Volta
g
e/Current.
Supported Sensors: C7600B1000 and C7600B1018
(
2 to 10V
)
, C7600C1008
(
4 to 20mA
)
.
Outdoor Air Enthalpy (W7750B,C
only):
T
y
pe: Current.
Supported Sensors: C7400A1004
(
4 to 20mA
)
.
Return Air Enthalpy (W7750B,C
only):
T
y
pe: Current.
Supported Sensors: C7400A1004
(
4 to 20mA
)
.
Air Filter Differential Pressure (W7750B,C
only):
T
y
pe: Volta
g
e.
Supported Sensors: Third part
y
2 to 10V, 0 to 5 inw
(
1.25 kPa
)
differential pressure sensors.
CO
2
Sensor (W7750B,C
only):
T
y
pe: Volta
g
e.
Supported Sensors: Third part
y
0 to 10V, 0 to 2000 ppm
CO
2
sensors.
Monitor Sensor for network use (W7750B,C
only):
T
y
pe: Volta
g
e.
Supported Sensors: Third part
y
2 to 10V, 2 to 10 volts
displa
y
ed.
DIGITAL INPUTS:
NOTE: Onl
y
one of each t
y
pe of input is allowed. For
example, onl
y
one Smoke Monitor is allowed. No
duplicate Smoke Monitors are usable on the same
controller.
Dr
y
-contact inputs are sensed usin
g
a 9 milliamp at 4.8 volts
detection circuit. It is ver
y
important that the device used
contains hi
g
h
q
ualit
y
, noncorrodin
g
contacts with resistivit
y
that does not de
g
rade; that is, increase over time. Use noble
metal
(
such as
g
old or silver
)
, or pimpled or sealed contacts to
assure consistent, lon
g
-term operation.
Two of the followin
g
Di
g
ital Inputs
(
DIs
)
can be confi
g
ured
when usin
g
the W7750A, and four of the followin
g
when usin
g
the W7750B,C:
— Fan Status:
Contact Closed = Fan on
— IAQ Switch:
Contact Closed = Poor Air Qualit
y
— Time Clock:
Contact Closed = Occupied Mode; Contact Open =
Unoccupied Mode
— Schedule Master:
Contact Closed = Local time clock is used as master time
clock
— Economizer Enable Si
g
nal:
Contact Closed = Economizer Enabled for coolin
g
use
— Smoke Monitor:
Contact Closed = Smoke Detected
— Dirt
y
Filter:
Contact Closed = Dirt
y
Filter
— Shutdown Si
g
nal:
Contact Closed = Shut off all e
q
uipment
— Occupanc
y
Switch:
Contact Closed = Room is Occupied; Contact Open =
Room is Unoccupied
— Window Monitor:
Contact Closed = Window is Closed
— Coil Freeze Stat:
(
Onl
y
use this DI when usin
g
E-Vision.
)
Contact Closed = Coil Freeze condition sensed
— Wall Module B
y
pass Pushbutton:
Momentar
y
DI
(
See Appendix B—Se
q
uences of Operation
for b
y
pass details.
)
TRIAC OUTPUTS ON THE (W7750B,C MODELS ONLY):
— Power ratin
g
s: 20 Vac to 30 Vac at 25 mA MIN to 500 mA
MAX current for an
y
volta
g
e.
CAUTION
When an
y
device is ener
g
ized b
y
a Triac, the device
must be able to sink a minimum of 25 mA.
NOTE: Triacs sink current to the 24 Vac common
(
COM
terminal on the W7750B,C Models
)
; see Fi
g
. 30 for
wirin
g
example.
IMPORTANT
If non-Honeywell motors, actuators, or transducers
are to be used with Excel 10 Controllers, Triac com-
patibility must be verified (see previous NOTE).
DIGITAL OUTPUTS:
COOL STAGE 1
COOL STAGE 2
COOL STAGE 3
COOL STAGE 4
HEAT STAGE 1
HEAT STAGE 2
HEAT STAGE 3
HEAT STAGE 4
CHANGE OVER RELAY
FAN
AUX ECON
OCCUPANCY STATUS
ECON OPEN
ECON CLOSE
COOL OPEN
COOL CLOSE
HEAT OPEN
HEAT CLOSE
HEAT COOL STAGE 1
HEAT COOL STAGE 2
HEAT COOL STAGE 3
HEAT COOL STAGE 4
FREE1
(
NOTE:
Free1
,
Free1 Pulse On
and
Free1 Pulse Off
are three separate and uni
q
ue di
g
ital output points. Because
the
y
are not related, the
y
all can be confi
g
ured in a CVAHU
controller at the same time.
)
FREE2
FREE1 PULSE ON
FREE1 PULSE OFF
ECON PWM
HEAT PWM
COOL PWM
UNUSED