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Table 3
System Output Signals
Signal (Vdc)
From
T7080A
10.5-13.5
W7080A,
W7084A
(LO)
W7080A
W7084A
(HI)
W7081A
0 to -10
W7082A
COLD DECK LOW LIMIT:
Limits cold deck temperature
50°F
or 55°F [7.2°C, 10% or
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%).
TO
2.22
W7080A,
W7082A,
W7084A,
M734
M734
W7081A,
2-12
W 7 0 8 3 A ,
195325B
W7081A,
12-22
W7083A,
195325B
14-17
M745K.L
4-7
M744D, M745G,P
Inverter (VAV fan
motor control
to selectable setpoints of 45°F.
12.8°C].
Economizer motor modulates outdoor air damper to mink
mum position when mixed air temperature
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
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
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
W7080A, W7083A
and 19253258 units only).
ADDITIONAL SYSTEM COMPONENTS:
C7100B (13 In.) Averaging
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
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.
is below setpoint
RISE:
Fourth Stage
(applies
to
Temperature
Sensor - One
sen-
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