Honeywell W7080A User manual

Honeywell
THIS SOLID-STATE SYSTEM ISACOMPONENT
FOR COMPONENT FIELD REPLACEMENT
FOR THE RANCO EA3 LODAPT SYSTEM. THE
BASIC SYSTEM CONTROLS UP TO 12 ZONE
DAMPERS, 3 HEATING STAGES, 3 COOLING
STAGES, AN INTEGRATED ECONOMIZER,
AND MODULATING VALVES FOR HOT WATER
AND CHILLED WATER. OPTIONAL UNITS
PROVIDE CONTROL OF UPTO 12ADDlTlONAL
ZONES, 5 STAGES OF ELECTRIC HEAT,
VARIABLE AIR VOLUME (VAV) SYSTEM FAN,
AND A FOURTH STAGE OF COOLING.
0 Modulated DC voltage signal from zone
thermostat, modified by zone discharge
sensor, provides direct control of
associated zone damper.
•i Pilot duty SPDT relays control heating
and cooling stages.
0 Economizer uses M745K or M745L motor
to provide true first stage of cooling, using
outdoor air whenever possible.
•i System switches all stages off when
power is intermpted; switches all stages
on when power is restored. Compressor
turn on time delays must be incorporated
for each compressor.
0 Power supplies in W7080A Load Analyzer
and W7084A Zone Adder are short-circuit
protected. Short circuits of 24 Vdc from
load analyzer or zone adder will not
damage their power supplies.
0 Night setback and cooling shut-down for
individual or all zones by adding a time
clock.
HG/KH Form
Number 63-4179
7/90
© Honeywell 1990

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 (60-
2350), C7100B (60-2539), T7080A,B (60-2527), W7081A (60-
2512).
C7046B
Temperature Sensor - (Ranco TR1-1001) is non-
averaging type with 6 in. [152 mm] probe for use in ducts
where space does not permit t longer C7100B.
C7100B Averaging Temperature Sensor - (Ranco TR1-
1002,-1003) installed in hot deck, cold deck 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) provides
economizer control in addition to hot and cold deok selec-
table
limik. Saves energy by maintaining selected tempera-
ture limik of hot and
cold decks when zone demands are
reduced.
For complete W7081A information, refer to form
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 demand, the
W7082A
reduces fan output, thus saving energy. (Requires
additional blower equipment. not available from Honeywell.)
W7083A Electric Heat Seq. - (Replaces Ranco
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-
C9100 optional unit permits addition of a fourth stage of
coding
to system.
ELECTRICAL RATINGS:
Voltage
and Frequency - 24 Vac, 50/60 HZ.
Maximum Power Consumption - W7080A IO VA;
W7081A, 0.29 VA;
W7082A, 1.5 VA; W7083A,
1.4 VA; W7084A, 3 VA.
Contact
Ratings (SPDT pilot duty relays) - See
Table
I.
SYSTEM INPUT SIGNALS: See Table 2.
SYSTEM OUTPUT SIGNALS: See Table 3.
STAGE DIFFERENTIALS AND THERMOSTAT DEAD
BAND:
See Figure 1.
Table 1
Relay Contact Ratings for W7080A, W7083A, 1953258
Voltage Inrush Running
Contact
Vac VA VA
Normally
open 24 I 240 60
1 12Oi240 I 750
1
75
Normal
dosed 24 75 30
1
20/240 240 40
Table 2
System
Input Signals
TO Signal (Vdc) From
W7080A 2-22 T7080A,B
W7081A 2-12 (LO) W7080A,
W7084A
12-22 (HI)
W7083A 2-12 W7080A,
W7081A
195325B
12-24 W7080A, W7081A
M745K,L 14-17 W7081A
M744D, M745G.P 4-7 W7081A

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.

Figure 2 - Mounting Dimensions for W7080A
W7082A, W7083A, W7084A Units in Inch [mm In
brackets]
Nonspring
Return Motors - M734J, M744D have a solid
state balance relay, operate on 24
Vac, 50/60 Hr.
Spring Return Motors - M746G,K,L,P motors have solid-
state balance relay, require separate 24 Vac, 50/60 Hz
power supplies.
Time Delay Relays - To improve stability of the system
and minimize energy
use, five minute turn on time delays
should be added to all heating and cooling loads. These
relays should be wired between
cooling and heating stage
switching outputs (W7080A Load Analyzer W7083A Electric
Heat Sequencer and 1953258 Fourth Stage Cooling Board)
and the heating and cooling equipment.
SYSTEM ACCESSORIES:
Transformers: AT20-20 VA; AT7240 VA; AT88-75 VA
4
Analyzer can also be used to power stage relays in the
W7083A Electric Heat Sequencer (if used). The M744
and M745 motors each require a separate transformer to
ensure
electrical isolation. ‘NEVER GROUND THE I
SECONDARY OF ANY TRANSFORMER USED TO
POWER
ANY SYSTEM COMPONENT. I
Q209A Minimum Position Potentiometer - Mounts direct-
iy on M734, M744, M745 motors; controls minimum open
position of damper.
Q605 Damper Linkage - Connects motor to damper. in-
cludes motor
crank arm.
Q618 Valve Linkage - Connects Modutrol motor to
modulating hot or chilled water valves.
S963A Remote Mlnlmum PositIon Potentiometer -
Provides remote manual control of minimum open position
of economizer motor.
Modulatlng Water Valves - Use appropriate valve with
Super Modutrol motor and Q618 Linkage to provide propor-
tional
control of hot or chilled water flow.
Compressor Ambient Lockout Thermostat - Use with
direct expansion
cooling system to prevent compressor
operation when outdoor air temperature falls below
economizer setpoint.
- T675A Temperature Controller.
- L6018CTemperatureController.
Economizer Changeover Controller - Holds economizer
at minimum position whenever outdoor air temperature or en-
thalpy is above controller setpoint.
- H205A1038 or H205A1046 Enthalpy Controller.
- T675A Temperature Controller.
- L6a%cT-nuc-
Nlght Setback - Provides heating setback of 6 to 22°F
[3.3
to 12.2°C]. Requires connection of a 1% resistor and
S6005 Time Clock contact conncected between Terminals 3,
7 or 6; and 5 of
T7080A or T7080B Thermostat.
- T675A Tsn~ cammu=
- L4o,acT-~Gmu0ua
S43 Sail Switch - Activates circuits when minimum airflow
is maintained in duct. Deactivates circuit below minimum
airflow.
1914448 Metal Cover - Designed to protect the W7080A,
W7081A,
W7082A, W7083A and W7084A components when
mounted
on open surface. Overall dimensions of units with
metal cover in place: 6% in. long, 4+‘1’16 in. wide, 49’w in.
high
[168.3 x 108.5 x 122.2 mm].