Table 3
System
Output
Signals
From
Signal (Vdc)
TO
T7080A 2.22 W7080A,
W7082A,
W7084A,
M734
10.5-13.5 M734
W7080A, 2-12
W7081A,
W7084A (LO)
W7083A,
195325B
W7080A 12-22
W7081A,
W7084A (HI) W7083A,
195325B
W7081A
W7082A
14-17
4-7
0
to
-10
M745K.L
M744D,
M745G,P
Inverter
(VAV fan
motor
control
COLD DECK LOW
LIMIT:
Limits
cold
deck
temperature
to
selectable
setpoints
of
45°F.
50°F
or
55°F [7.2°C, 10% or
12.8°C].
HOT DECK
HfGH
LIMIT:
Limits hot
deck
temperature
to
selectable
setpoints
of
90°F,
110°F
or
130°F [32.2°C,
43.3°C
or
54.4%).
Economizer
motor modulates outdoor air damper
to
mink
mum
position
when mixed air
temperature
is
below
setpoint
of
W7081A
Limit
Controller.
This
setpoint
is selectable
to
50°F.
55°F
or
60°F
[10°C,
12.8°C
or
15.6°C],
with
a
10°F
[5.6°C]
fixed
throttling
range.
tNTEGRATOR MINIMUM OUTPUT:
Selectable from 0
to
-8
Vdc
(0
to
60
percent
fan
motor
speed).
ZONE DlSCHARGE SENSOR AUTHORITY:
20:1,
which
means
a
20°F
[11.1°C]
rise
at the
zone
dii
charge
sensor
produces
a
voltage
change
equal
to a 1°F
[0.5°C]
rise
at the space
thermostat.
AMBIENT TEMPERATURE RISE:
Operating- -40
to
150°F [-40 to 65°C]
Shipping-
-30
to
150°F
[-34
to
65°C]
MOUNTING:
The
W7080A,
W7081A,
W7082A,
W7083A,
W7084A
units
each
attach
with
four
screws
through
mounting holes in the
base (saws not provided). The 195325B Fourth Stage
coding
Board
can
be
mounted on a Rat
surface.
Sea
in-
dividual specification
sheets
for
mounting
details.
UNDERWRfTERS
LABORATORIES INC.
CCMPONENT
RECOGNIZED:
Fib
number
SA481, Guide number SDFY2D (applies
to
W7080A, W7083A and 19253258 units
only).
ADDITIONAL SYSTEM COMPONENTS:
C7100B
(13
In.)
Averaging
Temperature
Sensor
-
One
sensor
in
hot
deck,
one
sensor
in
cold
deck
and one
sen-
sor
in mixed
air
to supply
the
three sensor input signals re-
quired
by
the
W7081A
Limit Controller. Also,
one
sensor
is
installed in each
zone
discharge duct to
supply
anticipation
to
the
T7080A
Zone
Thermostat.
Where
space
is
insufficient
for he 13 in.
[304.8
mm]
probe
of the
C7100B,
the C7046B single point temperature sen-
sor,
with 6 in.
[152.4
mm] probe, may be installed.
1353258
Fourth
Stage
Cooling
Board
-
Controls
opera-
tion
of
two
stage
compressor
in
the
system.
Mounts
separately
from
other
components.
H205A
Enthalpy
Controller
-
Controls
economizer
opera-
tion in response to
enthalpy
(total
heat
content) of outdoor
air.
Signals
economizer
to
close
outdoor
air damper
(or
modulate m minimum
position)
when
enthalpy
is
above
H205
setpoint
and
to
open damper on a call for cooling
when
enthalpy
is
below
setpoint.
To Next Page
Loading...
