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SYSTEM COMPONENTS:
All components of the W7080 Multizone Control System are
briefly described in this section. For detailed information on
C7046B and C7100B sensors. T7080A,B Thermostats and
W7081A Limit Controller, refer to the associated specifica-
tion sheets (form number in parenthesis): C7046B ( 6 0 -
2350), C7100B (60-2539),
T7080A,B (60-2527), W7081A (60-
2512).
C7046B Temperature Sensor - (Ranco TR1-1001)
averaging type with 6 in. [152 mm] probe for use in ducts
where space does not permit t longer C7100B.
C7100B Averaging
Temperature
1002,-1003)
installed in hot deck, cold d e c k and mixed air
ducf to provide limit signals for limit controller operation.
Also installed in discharge air duct of each zone to provide
anticipation
for the T7080 Thermostat. Sensor probe length
is 13 in. [330 mm].
H205A Enthalpy Controller - (Ranco (15) senses heat
content (temperature and humidity) of outdoor air. Allows
use of outdoor air for free cooling.
S7666A Simulator - (Ranco TEI) portable unit provides
check of system by substituting adjustable DC voltage for
zone thermostat and sensor signals.
T7080A,B Solld State, Dual Setpoint Thermostat -
(Ranco TR3, TR4) modulates zone dampers and supplies
load demand signal to load analyzer. Single voltage ramp
design has variable, 3 to 30°F [I.7 to 16.7%] dead bard.
For complete T702OA.B information, refer to form number
60-2527,
T7080A has a built-in sensor; T7080B requires
remote sensor.
W7080A
Load Analyzer
- (Ranco EA3) provides SPOT
relay switching of three stages of healing and three stages
of cooling and modulating output to economizer and valve
motors in response to highest healing and cooling demand
from zone thermostats.
Analyzer is source cl 24 Vdc power
for zone thermostats sensors, and W7081A Limit Controller.
W7081A
Limit Controller - (Ranco EA5-G3002)
economizer control in addition to hot and cold deok selec-
table limik. Saves energy by maintaining selected
ture limik of hot and cold d e c k s when zone demands
reduced. For complete W7081A information,
number
W-2512.
W7082A Integrator Analyzer - (Ranco EA5-C6001-35) op-
tional unit controls system blower in VAV systems in
response to zone demand. During decreased
W7082A reduces
fan output, thus saving energy. (Requires
additional
blower equipment. not available from Honeywell.)
is non-
Sensor - (Ranco TR1-
provides
tempera-
are
refer to form
demand, the
W7083A Electric Heat S e q .
EA5-C0501)
optional unit switches up to five ON/OFF
stages of electric heat, provides stage turn on delay on
power restoration.
W7084A
Zom Adder - (Ranco EA5-C9001,-C9002) option-
al unit permits the addition of up to 12 zones to system.
196325s Fourth Stage Cooling Board - (Ranco EA5-
C 9 1 0 0 optional unit permits addition of a fourth stage of
coding to system.
ELECTRICAL
RATINGS:
Voltage and Frequency
Maximum
Power Consumption
W7081A, 0.29 VA; W7082A, 1.5 VA; W7083A,
1.4 VA; W7084A,
Contact Ratings (SPDT pilot duty relays) - See
Table I.
SYSTEM INPUT SIGNALS:
SYSTEM OUTPUT SIGNALS: See Table 3.
STAGE DIFFERENTIALS AND THERMOSTAT DEAD
BAND: See Figure 1.
Relay Contact Ratings for W7080A, W7083A, 1953258
Voltage
Contact
Vac
Normally
open
24
1
12Oi240
Normal dosed
2 4
1 20/240
System Input Signals
TO
Signal (Vdc)
W7080A
W7081A
2-12 (LO)
12-22 (HI)
W7083A
195325B
M745K,L
M744D,
M745G.P
- (Replaces
Ranco
- 24 Vac, 50/60 H
.
Z
- W7080A IO VA;
3 VA.
See Table 2.
Table 1
Inrush
Running
VA
VA
I
240
60
I
750
7 5
1
75
3 0
240
4 0
Table 2
From
2-22
T7080A,B
W7080A, W7084A
W7080A, W7081A
2-12
12-24
W7080A, W7081A
14-17
W7081A
4-7
W7081A
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