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EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
11 74-2958—1
PWM
Pulse Width Modulated output; allows analo
g
modulatin
g
control of e
q
uipment usin
g
a di
g
ital output
on the controller.
RTD
Resistance Temperature Detector; refers to a t
y
pe of
temperature sensor whose resistance output chan
g
es
accordin
g
to the temperature chan
g
e of the sensin
g
element.
Subnet
A L
ON
W
ORKS
Bus se
g
ment that is separated b
y
a
router from its Q7750A Zone Mana
g
er.
TOD
Time-Of-Da
y
; the schedulin
g
of Occupied and
Unoccupied times of operation.
TPT
Twisted Pair Transceiver.
VA
Volt Amperes; a measure of electrical power output or
consumption as applies to an ac device.
Vac
Volta
g
e alternatin
g
current; ac volta
g
e rather than dc
volta
g
e.
VAV
Variable Air Volume; refers to either a t
y
pe of air
distribution s
y
stem, or to the W7751 Excel 10 VAV Box
Controller that controls a sin
g
le zone in a variable air
volume deliver
y
s
y
stem.
VOC
Volatile Or
g
anic Compound; refers to a class of
common pollutants sometimes found in buildin
g
s.
Sources include out-
g
assin
g
of construction materials,
production-line b
y
-products, and
g
eneral cleanin
g
solvents. A VOC is occasionall
y
used as a measure of
indoor air
q
ualit
y
.
W7750
The model number of the Excel 10 CVAHU
Controllers
(
also see CVAHU
)
.
W7751
The model number of the Excel 10 VAV Box
Controllers
(
also see VAV
)
.
Wall Module
The Excel 10 Space Temperature Sensor and
other optional controller inputs are contained in the
T7770 or the T7560A,B Wall Modules. See Application
Step 5. Order E
q
uipment for details on the various
models of Wall Modules.
XBS
Excel Buildin
g
Supervisor; a PC based tool for
monitorin
g
and chan
g
in
g
parameters in C-Bus devices.
Construction
Controllers
The Excel 10 W7750 Controller is available in three different
models. The W7750A Model, which is a low cost controller
made for simple sin
g
le zone air handlers and heat pump
controls. The W7750B,C Models are intended for more
complex applications.
The W7750B,C Models use Triacs for their di
g
ital outputs,
where as the W7750A Model uses dr
y
-contact rela
y
s. The
W7750C Model also has three analo
g
outputs available on
terminals 16, 17 and 18.
All wirin
g
connections to the controller are made at screw
terminal blocks. Connection for operator access to the
L
ON
W
ORKS
Bus is provided b
y
plu
gg
in
g
the SLTA connector
cable into the L
ON
W
ORKS
Bus communications
j
ack.
The W7750A,B,C Models consist of a sin
g
le circuit board that
is mounted in a sheet metal subbase and protected b
y
a
factor
y
snap-on cover. The three controllers have the same
ph
y
sical appearance except for terminals 16 throu
g
h 20
(
W7750A
)
and different labels next to the wirin
g
terminals
(
see Fi
g
. 3, 5 or 6
)
. Wires are attached to the screw terminal
blocks on both sides of the controller. The controllers mount
with two screws
(
see Fi
g
. 4 or 7
)
. The W7750 can also be
mounted usin
g
DIN rail. To mount the W7750 on DIN rail,
purchase two DIN rail adapters
(
obtain locall
y)
part number
TKAD, from Thomas and Betts, see Fi
g
. 8, then snap onto
standard EN 50 022 35 mm b
y
7.5 mm
(
1-3/8 in. b
y
5/16 in.
)
DIN rail. DIN rail is available throu
g
h local suppliers.
A channel in the cover allows the controller status LED to be
visible when the cover is in place. There are no field-
serviceable parts on the circuit board and, therefore,
it is
intended that the cover never be removed
.
The W7750A,B,C can be mounted in an
y
orientation.
Ventilation openin
g
s were desi
g
ned into the cover to allow
proper heat dissipation re
g
ardless of the mountin
g
orientation.
See Fi
g
. 4 and 7.
The input/output and control differences between the two
models are summarized in Table 2. The I/O points in Table 2
are the free I/O points that are not reserved for Wall Module
use.
Table 2. List of Differences in W7750A and W7750B,C Controllers.
*The T7770 or the T7560 Wall Modules includes I/O points for
two analo
g
inputs for the space temperature and the setpoint
knob, a di
g
ital input for the B
y
pass pushbutton, and a di
g
ital
output for the LED B
y
pass Indicator. These W7750 I/O
points are confi
g
urable, but are normall
y
used for the Wall
Module.
W7750A Model W7750B,C Models
Digital Outputs
Six Rela
y
Outputs Ei
g
ht Triac Outputs
Digital Inputs
Two Four
Wall Module
One* One*
Analog Outputs
None Three 4 to 20 mA Outputs
(
W7750C onl
y)
Analog Inputs
One
(
Resistive Input Onl
y)
Four
(
Two Resistive and two Volta
g
e/Current Inputs
)
DC Power
None 20 Vdc available to power optional sensors
Floating (Series 60) Control
Economizer Onl
y
Heatin
g
, Coolin
g
, and/or Economizer
PWM Control
None Heatin
g
, Coolin
g
, and/or Economizer