EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
74-2958—16
INTRODUCTIONDescription of Devices
The W7750 is the Constant Volume Air Handlin
g
Unit
(
CVAHU
)
Controller in the Excel 10 product line famil
y
. The
CVAHU is a LONMARK compliant device desi
g
ned to control
sin
g
le zone and heat pump air handlers. W7750 s
y
stems
control the space temperature in a
g
iven zone b
y
re
g
ulatin
g
the heatin
g
and coolin
g
e
q
uipment in the air handler that
delivers air to that space. The W7750 air handler is t
y
picall
y
an all-in-one constant air volume packa
g
ed unit, located on
the roof of the buildin
g
. In addition to standard heatin
g
and
coolin
g
control, the W7750 provides man
y
options and
advanced s
y
stem features that allow state-of-the-art
commercial buildin
g
control. The W7750 Controller is capable
of stand-alone operation; however, optimum functional
benefits are achieved when the network communication
capabilities are used. The W7750 utilizes the Echelon
LONWORKS network
(
LONWORKS Bus
)
for communications,
and conforms with the LONMARK HVAC Interoperabilit
y
standard for Roof Top Unit Controllers
(
see Fi
g
. 9
)
.
The T7770 or T7560 direct-wired Wall Modules are used in
con
j
unction with W7750 Controllers. The zone controlled b
y
the W7750 Controller t
y
picall
y
can use a T7770A throu
g
h D or
a T7560A,B Wall Module. Additional features available in
T7770A throu
g
h D models include analo
g
setpoint input knob,
override di
g
ital input pushbutton, override status LED and
LONWORKS Bus network access
j
ack. Additional features
available in T7560A,B models include analo
g
setpoint input
knob, override di
g
ital input pushbutton, humidit
y
sensor
(
T7650B model
)
, override status LCD and di
g
ital displa
y
.
The Q7750A Excel 10 Zone Mana
g
er is a communications
interface that allows devices on the LONWORKS Bus network
to communicate with devices on the standard EXCEL 5000
S
y
stem C-Bus. Fi
g
. 1 shows an overview of a t
y
pical s
y
stem
la
y
out. The Q7750A also provides some control and
monitorin
g
functions.
Fig. 1. Typical system overview.
PERSONAL COMPUTER TOOLS
E-VISION
CARE
Q7752A
LONWORKS BUS
SERIAL
ADAPTER
EXCEL 10
Q7750A
ZONE
MANAGER
C-BUS COMMUNICATION NETWORK
EXCEL 500
EXCEL BUILDING SUPERVISOR
C-BUS TO LONWORKS BUS
INTERFACE DEVICE
EXCEL 10 W7751F
PANEL PLENUM
MOUNT VERSION
VARIABLE AIR VOLUME
CONTROLLER
LONWORKS-BUS COMMUNICATIONS NETWORK LONWORKS BUS COMMUNICATIONS NETWORK
Q7751A
FTT
LONWORKS BUS
ROUTER
EXCEL 10 T7770
WALL MODULE EXCEL 10 T7560A, B
WALL MODULE
M17487
EXCEL 10
W7750B
CVAHU
CONTROLLER
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Q7740A
2-WAY
REPEATER