Solid State Economizer System - Honeywell

Solid State Economizer System - Honeywell
Solid State Economizer System
(CONSISTING OF: C7046C DISCHARGE AIR SENSOR OR C7150B MIXED AIR SENSOR, C7400 SOLID STATE ENTHALPY
SENSOR OR C7660 SOLID STATE TEMPERATURE SENSOR, M7415, M7215 OR M8405 DAMPER ACTUATORS OR MODULATING DIRECT COUPLED ACTUATORS (MS7503 or MS7505) T6031H THERMOSTAT AND W7459 OR W7212 SOLID
STATE ECONOMIZER LOGIC MODULE)
SYSTEM ENGINEERING GUIDE
FEATURES
C7046C Discharge Air Sensors have probe lengths of 8 in.
(203 mm) and nominal sensor resistance of 3000 ohms at
77В°F (25В°C).
C7046C
• No setting or calibration required.
M7215/M7415/
M8405
• Solid state components not affected by dust or dirt.
• Fast reacting.
• Rugged aluminum insertion probe.
C7150B Mixed Air Sensor is used with the W7212/W7459
Economizer Module to sense mixed or discharged air in rooftop packaged air conditioning equipment.
C7150B
W7459A,C
• No setting or calibration required.
C7400 Solid State Enthalpy Sensor and C7660 Solid State
Temperature Sensors are used with the W7212/W7459 Solid
State Economizer Logic Module to sense outdoor and return
air enthalpy or temperature.
W7212A,C
C7400A/C7660
T6031H
APPLICATION
The Solid State Economizer System provides an economical
method of providing cooling air by incorporating outdoor air in
the first stage of cooling in heating, ventilating and air
conditioning (HVAC) systems. The Solid State Economizer
System consists of the C7046C Discharge Air Sensor or
C7150B Mixed Air Sensor, C7400 Solid State Enthalpy
Sensor or C7660 Solid State Temperature Sensor, M7215,
M7415 or M8405 Damper Actuators or Modulating Direct
Coupled Actuators (MS7503 or MS7505), T6031H Thermostat
and W7212A,C or W7459A,C Solid State Economizer Logic
Module.
• C7400 senses and combines temperature and humidity
(enthalpy) of outdoor air (heat index).
• C7660 senses temperature only and can only be used
in single referential control. Use C7400 enthalpy for
differential control.
• When enthalpy/temperature of outdoor air increases,
the outdoor air damper closes to a preset minimum
position.
• When enthalpy/temperature of outdoor air is low, the
outdoor air damper opens to reduce the building
cooling load.
63-2484—03
SOLID STATE ECONOMIZER SYSTEM
M7415 and M8405 Damper Actuators are 25 lb-in. spring
return damper actuators that provide modulating or threeposition control of economizer systems on HVAC equipment.
• M7415 Damper Actuator provides modulating control
of economizer dampers from a thermistor mixed-air or
discharge sensor to maintain 56В°F (13В°C) air
temperature.
• M8405A Damper Actuator provides three-position
control: closed, adjustable mid-position, and open.
• W7459 logic modules may plug directly onto the
M7415.
• High impact, glass-fiber reinforced, plastic case is
rugged, lightweight and corrosion resistant.
• LED on W7459 indicates free cooling is available when
there is a call for cooling from the thermostat.
W7212A economizer logic module used with C7400A
enthalpy sensors (W7212C uses a C7400C enthalpy sensor),
M7215, MS7503, or MS7505 damper actuators and C7232
CO2 sensors to proportion outdoor and return air dampers
from economizer and demand control ventilation in commercial HVAC equipment.
• Operates from thermostat and DCV sensor to provide a
totally integrated control system.
M7215 Damper Motors provide 25 lb-in. torque with spring
return and 2–10 Vdc modulating control of economizer systems on HVAC equipment.
• Combines minimum and DCV maximum damper
position potentiometers with compressor staging.
• M7215 Damper Motors provide modulating control of
economizer dampers from a 2–10 Vdc controller.
• Solid state enthalpy or dry bulb changeover control.
• W7212 logic module may plug directly onto the M7215.
T6031H Thermostat acts as changeover thermostat.
• Terminals included for switching between Occupied
and Unoccupied operation.
• Maximum economizer savings is achieved with two (2)
C7400 enthalpy sensors, one (1) W7212 economizer
logic module, and one (1) C7232 CO2 sensor using
differential enthalpy changeover and Demand Control
Ventilation (DCV).
• Switches enclosed to resist effects of dust and
moisture.
• Warmer–Cooler temperature scale.
• LED indicates when free cooling is available.
• Sensing bulb installed in return air flow.
W7459A,C Solid State Economizer Logic Module used with
C7400A Solid State Enthalpy Sensors and M7415 or M8405
Damper Actuators to proportion outdoor and return air dampers for economizer control in commercial HVAC equipment.
• Combine functions of solid state enthalpy changeover
control, minimum damper position potentiometer
(W7459A) and compressor staging relays.
• Optional differential enthalpy control provides greater
economizer savings than single enthalpy control by
selecting the most economical air for cooling.
• W7459A mounts on M7415 Damper Actuator and
accepts inputs from C7150B Mixed Air Sensors,
C7400A Solid State Enthalpy Sensors, C7046C
Discharge Air Sensor, and optional remote minimum
damper position potentiometer.
• W7459C mounts on M8405A Damper Actuator and
accepts inputs from single pole single throw (spst)
mixed or discharge air control and C7400A Solid State
Enthalpy Sensors.
• Packages are designed to operate from the cooling
space thermostat to provide a totally integrated control
system.
• Enthalpy setpoint (A,B,C,D) located on W7459 Solid
State Economizer Logic Module is used to select
combination of air temperature and humidity that is
suitable for free cooling.
63-2484—03
• W7459A include built-in adjustable minimum damper
position potentiometer that controls the amount of
outdoor air admitted to meet minimum ventilation
requirements; includes terminals for connecting
optional remote minimum position potentiometer.
• LED indicates when module is in DCV mode.
• LED indicates when exhaust fan contact is closed.
• W7213 is used with heat pump B terminal.
• W7214 is used with heat pump O terminal.
• Models available for default to minimum position or to
closed on freeze protection. Check with your
Honeywell representatives for the specific OS
numbers.
MS7503 or MS7505 Spring Return Direct
Coupled Actuator
The MS7503 and MS7505 Series Spring Return Direct Coupled Actuators (DCA) are control actuators that provide proportioning control for valves and dampers. They accept a
voltage signal from an economizer to position a damper or
valve at any chosen point between fully open and fully closed.
• Brushless DC submotor with electronic stall
protection.
• Patented self-centering shaft adapter.
• Access cover to facilitate connectivity.
• Metal housing with mechanical end limits.
• Field-installable auxiliary switches.
• Spring return direction field-selectable.
• Hub includes position indicator.
2
SOLID STATE ECONOMIZER SYSTEM
SPECIFICATIONS
Dimensions:
See Fig. 1.
IMPORTANT
The specifications given in this publication do not
include normal manufacturing tolerances. Therefore,
these units may not exactly match the specifications
listed. Also, these products are tested and calibrated
under closely controlled conditions and some minor
differences in performance can be expected if these
conditions are changed.
C7150B Mixed Air Sensor
Models:
Specifications for each model are listed separately.
Used to sense mixed air in rooftop packaged air conditioning
equipment.
Resistance/Temperature (NTC):
Nominal Resistance: 3000 ohms at 77В°F (24В°C). Nominal
Sensitivity: 70 ohms per degree F (124 ohms per degree
C) at midrange.
Maximum Ambient Temperature:
250В°F (121В°C).
C7046 Discharge Air Sensors
Intended for use as a discharge sensor in rooftop applications.
Operating Temperature Range:
-40В°F to +110В°F (-40В°C to +44В°C).
Dimensions:
See Fig. 2.
Sensing Element:
Carbon type, thermistor-resistor element.
C7400 Solid State Enthalpy Sensor/C7660
Solid State Temperature Sensor
Performance Characteristics:
Reaction Time Constant with Air Approach Velocity of
8.33 ft/sec (2.54 m/sec): 60 seconds.
Senses enthalpy or temperature of outdoor and return air.
Resistance/Temperature (NTC):
Nominal Resistance: 3000 ohms at 77В°F (24В°C). Nominal
Sensitivity: 70 ohms per degree F (124 ohms per degree
C) at midrange.
Temperature Sensing Element:
Thermistor.
Mounting Arrangement:
Integral mounting flange that requires two no. 8 screws
(not provided).
Output Signal:
C7400: 4 to 20 mA current signal; increases from 4 mA to
20 mA as enthalpy decreases.
C7660: 4 or 20 mA signal; 4 mA not OK to economize and
20 mA OK to economize.
Maximum Ambient Temperature:
250В°F (121В°C).
Ambient Operating Temperature Range:
-40В°F to +125В°F (-40В°C to +52В°C).
Operating Temperature Range:
40В°F to 150В°F (4В°C to 66В°C).
Approval:
Underwriters Laboratories Inc. Flammability Rating: UL94-5V.
Wiring Connections:
6 in. (152 mm) leadwires.
Dimensions:
See Fig. 3.
1/2 (13)
DIAMETER
3/8 (10)
DIAMETER
7/8
(22)
1/4 (6)
DIAMETER
(2)
3/4 (19)
1-1/2 (38)
9/16
(14)
IMMERSION LENGTH: 8 (203)
M9087
Fig. 1. Approximate dimensions of C7046C Air Temperature Sensor in in. (mm).
3
63-2484—03
SOLID STATE ECONOMIZER SYSTEM
Terminal Connections:
1/4 in. (6 mm) male quick connect terminals mounted on
actuator. Terminal arrangement is dependent on actuator
model.
3/4
(19)
Ambient Operating Temperature Range:
-40В°F to +125В°F (-40В°C to +52В°C).
Voltage and Timing:
See Table 1.
3/16 (5) DIAMETER
Dimensions:
See Fig. 4.
Shaft:
Single-ended drive shaft with crank arm supplied.
Flammability Rating:
Underwriters Laboratories Inc. UL94-5V.
2
(51)
Approval:
Underwriters Laboratories Inc. Component Recognized: File
No. E4436, Guide No. XAPX2, Vol. 9, Section 1, 7-25-83.
SPECIFICATIONS: M7215
2-1/2 (64)
M9084
Models: ML7215: 25 lb-in. (2.8 Nm) torque, foot-mounted
spring-return damper motor with 2-10 Vdc feedback signal.
Accepts 2-10 Vdc control signal.
Fig. 2. Approximate dimensions of C7150B Mixed/
Discharge Air Sensor in in. (mm).
Dimensions: See Fig. 4.
Electrical Ratings:
Supply Voltage: 24 В±6 Vac 50/60 Hz.
Power Consumption: 24 Vac, 60 Hz: 8.7 VA. 24 Vac, 50 Hz:
8.4 VA.
5/16 (8)
3-5/32
(80)
S
2-3/4
(70)
9/16
(14)
7/32
(6)
Torque:
Lift and Hold: 25 lb-in. (2.8 Nm). Spring Return: 25 lb-in.
(2.8 Nm). Breakaway: 40 lb-in. (4.5 Nm).
+
IMPORTANT
Never use motor continuously at the breakaway
torque rating.
3-7/8 (96)
1 (25)
NOTE: Breakaway torque available to overcome occasional
large loads such as a seized damper.
M9096
Fig. 3. Approximate dimensions of C7400 Solid State
Enthalpy Sensor/C7660 Solid State Temperature Sensor
in in. (mm).
M7415A, M8405A Damper Actuators
Provides control of economizer systems on HVAC equipment.
Actuator Rotation:
Closed position is the limit of clockwise rotation; open position
is the limit of counterclockwise rotation as viewed from the
shaft end of the motor.
Auxiliary Switch Rating (M8405A only):
24 Vac, 20 VA inrush, 20 VA run.
63-2484—03
4
Stroke:
Travel: 90В°.
Timing:
Driving: 86 В±5 seconds.
Spring Return: 13 В±5 seconds.
Motor Rotation (Viewed From Shaft End):
Closed Position: Limit of clockwise rotation.
Open Position: Limit of counterclockwise rotation.
Crank Arm Rotation Limits: See Fig. 8.
Shipped with shaft in closed position.
Ambient Ratings:
Temperature:
Operating: -25В°F to +125В°F (-32В°C to +52В°C).
Storage: -30В°F to +150В°F (-34В°C to +66В°C).
Humidity: 5 to 95 percent RH, noncondensing.
SOLID STATE ECONOMIZER SYSTEM
Terminal Connections: 1/4 in. (6 mm) quick-connect
terminals mounted on motor.
Approvals:
Underwriters Laboratory Inc.: Flammability Rating: UL94-5V.
Component Recognized: File No. E4436, Guide No.
XAPX2, Vol. 9, Section 1, 7-25-83.
Shaft: Single-ended drive shaft with crank arm supplied.
Reliability:
Full-Stroke Cycles: 60,000. Repositions: 1,500,000.
4-1/2 (114)
1/4 (6)
1-3/8 (35)
4-1/32
(102)
4-1/2
(114)
4-1/2
(114)
3-1/8 (79)
5
(127)
7/16
(11)
2-1/4 (57)
3-1/2 (89)
5-3/16 (132)
1-1/4
(32)
TOP VIEW
SIDE VIEW
POWER END VIEW
M3851
Fig. 4. M7215, M7415A, and M8405A Damper Motor dimensions in in. (mm).
Table 1. M7415A/M7405A Actuator Specifications.
Power (Vac)
Model Number
Voltage (Vac)
50/60 Hz
(Drive) (Hold)
Torque
Timing
(sec)a
Stroke
(В°)
(lb-in.)
(Nm)
Open Rotation
(Shaft End View)
Spring Return
(Shaft End View)
M7215Aa,b,c
24
8
5
90
90
25
2.8
ccw
cw
M7415Ab,c
24
8
5
90
90
25
2.8
ccw
cw
M8405Ab,d
24
7
3
90
90
25
2.8
ccw
cw
M7415Bb,c
24
8
5
90
90
25
2.8
cw
ccw
M7215Ab,c
24
8
5
90
90
25
2.8
ccw
cw
a,b,c,e
MS7503
24
5
1
90
90
27
3
cw/ccw
cw/ccw
MS7505a,b,c,e
24
13
5
90
90
44
5
cw/ccw
cw/ccw
a
Timing with 60 Hz power.
Spring return.
c Modulating.
d Three-position with field adjustable minimum position control.
e Mounts directly on damper shaft.
b
T6031H Thermostat
Control Range, Element Temperature and Differential:
See Table 2.
A standard spdt switch, without a case, that acts as a
changeover thermostat.
Approval:
Underwriters Laboratories Inc. Listed:
File E4436, Vol. 4, Guide No. XAPX2.
Electrical Rating:
0.25A at 1/.4V to 12 Vdc inductive load.
Dimensions:
See Fig. 5.
5
63-2484—03
SOLID STATE ECONOMIZER SYSTEM
3/4
)
(19
1
/16
4-3 6)
(10
4-1/16
(103)
OVERALL LENGTH: 5 (127)
2-3/16
(56)
OVERALL DEPTH LESS
ADJUSTING DIAL SHAFT:
2-1/8 (54)
1
ON THE 114496 BRACKET, THE MOUNTING HOLES ARE TWO
NO. 8-32 TAPPED HOLES. THE 107940 BRACKET IS MOUNTED
WITH A 5/32 (4) DIAMETER HOLE AT THE TOP AND A VERTICAL
M9090A
5/32 X 5/16 (4 X 8) SLOT AT THE BOTTOM.
Fig. 5. Approximate dimensions of back mounting
bracket for T6031H in in. (mm).
7/8 (22)
W7459A,C Solid State Economizer Logic
Module
2-13/16 (71)
Used with C7400A Sensor or C7660 Sensor and M7415 or
M8405 Actuator to proportion outdoor and return air dampers
for economizer control in commercial HVAC equipment.
1-1/4
(32)
Electrical Ratings:
Input Voltage: 24 Vac, 50/60 Hz.
Power Consumption: 5.5 VA.
Relay Contact Rating at 24 Vac: 1.5A run, 3.5A inrush.
5/8
(16)
M9085A
Temperature Ratings:
-25В°F to +125В°F (-32В°C to +52В°C).
Approval:
Underwriters Laboratories Inc.: Flammability Rating: UL94V-5V.
Fig. 6. Approximate dimensions of W7459 Solid State
Economizer Logic Module in in. (mm).
SPECIFICATIONS: W7212A,C
LOGIC MODULE
Specifications:
See Table 3.
Dimensions:
See Fig. 6.
Models: W7212A, W7213A, W7214A Logic Modules: for use
with any Honeywell 2-10 Vdc actuator; includes DCV input;
adjustable exhaust fan setpoint.
NOTES:
—
—
63-2484—03
6
All models include a minimum damper position
potentiometer, and setpoints for: occupied/unoccupied control, DCV operation, and DCV maximum.
Occupied/Unoccupied overrides minimum
damper position setting when building is unoccupied.
SOLID STATE ECONOMIZER SYSTEM
Dimensions: See Fig. 7.
Electrical Ratings:
Input Voltage: 24 Vac В±20%; 50/60 Hz (Class 2). Nominal
Power Consumption (at 24 Vac, 60 Hz): 11.5 VA.
Relay Contact Rating at 30 Vac (maximum power from class 2
input only): 1.5A run, 3.5A inrush.
IMPORTANT
All inputs and outputs must be 24 Vac Class 2.
Ambient Ratings:
Temperature: -40В°F to +149В°F (-40В°C to +65В°C). Humidity: 5
to 95 percent RH (noncondensing).
C7150B Mixed Air Temperature Sensor.
C7232A,B Carbon Dioxide Sensors.
C7632 Carbon Dioxide Sensor.
C7400A Solid State Enthalpy Sensor used with W7212A,
W7213, and W7214 economizers.
C7400C Solid State Enthalpy Sensor used with W7212C
economizers.
C7660 Dry Bulb Temperature Sensor.
S963B1128 Remote Potentiometer to provide remote control
of damper minimum position.
ST6008 Energy Management Timer for occupied/unoccupied
control.
4-3/8 (112)
Inputs:
Enthalpy (C7400A or C7400C)
Dry Bulb Temperature (C7660)
Discharge Air (C7046)
Mixed Air (C7150)
DCV Sensor (C7232 or C7632): 0/2-10 Vdc control signal;
100K ohm input impedance.
1-5/8
(41)
Outputs:
Actuator Signal: 2-10 Vdc. Minimum Actuator Impedance: 1K
ohm.
Exhaust Fan: Contact closure.
24 Vac Out: 25 VA maximum.
2-1/16
(53)
1-15/16
(49)
4-1/8
(104)
Approvals:
Underwriters Laboratories Inc.: UL873 listed.
Flammability Rating: UL94-5VB.
Plenum Rated.
CE.
C-tick.
Accessories:
4074EJM Bag Assembly. Consists of: Checkout jumper, 620
ohm, 1.2K ohm, 5.6K ohm, and 6.8K ohm checkout resistors.
C7046A Discharge Air Temperature Sensor.
1/8 (4)
2-5/8 (66)
M20578B
Fig. 7. Logic module dimensions in in. (mm).
Table 2. T6031H Thermostat Specifications.
Model
Number
T6031H
Control Range
В°F
0В° to 95В°
В°C
Max Element
Temperature
В°F
-18В° to +35В° 150В°
Differential
В°C
66В°
В°F
3В°
В°C
2В°
Type of Capillary Length
Mounting
ft
m
Back
2
0.6
Bulb Size
in.
3/8 x 3-1/2
mm
10 x 89
Table 3. W7459A,C,D Specifications.
For Use with
Discharge Air
Minimum Position
Actuator
Temperature Input Potentiometer Adjustment
M7415
Thermistor Sensor Yes
M8405
Spst control
No. Minimum position
adjustment is built into
M8405 Actuator
Thermistor sensor Yes
W7212A1,C2 M7215
MS7503
MS7505
Model
W7459A
W7459C
1
2
Terminals for Remote
Minimum Damper Position Output Relays
Yes
2 spdt
No
2 spdt
Yes
2 spdt (M7215
and MS7505)
1 spdt (MS7503)
The W7212A has A, B, C, and D settings that correspond to the lines on the partial psychrometric chart in Fig. 18.
The W7212C has A, B, C, D, and E settings that correspond to the lines on the partial psychrometric chart in Fig. 19.
7
63-2484—03
SOLID STATE ECONOMIZER SYSTEM
INSTALLATION: M7215, M7415,
M8405
When Installing this Product...
1.
2.
3.
4.
Read instructions carefully. Failure to follow them could
damage the product or cause a hazardous condition.
Check ratings and description given in the specifications
to make sure the product is suitable for your application.
Installer must be a trained, experienced service technician.
After installation is complete, check out product operation as provided in these instructions.
CAUTION
MAXIMUM
OPEN
POSITION
MOTOR MOUNTING SURFACE
1 CRANK ARM FIELD ADJUSTABLE IN 7.5 DEGREE INCREMENTS. M3850
Fig. 8. Limits of crank arm rotation.
Electrical Shock or Equipment Damage Hazard.
Can shock individuals or short equipment
circuitry.
Disconnect power supply before installation.
WIRING: M7215
All wiring must comply with applicable codes and ordinances.
Refer to Fig. 9 for typical hookup.
CAUTION
Personal Injury Hazard.
Spring-return assembly can release.
Leave end covers attached to the motor.
Location and Mounting
6.
TR1
METER INDICATING
MOTOR POSITION
(2-10 VDC)
Reposition the crank arm to accommodate specific
damper requirements.
Reconnect crank arm to the motor hub.
If there is an excess length of linkage rod, cut it to size.
Make necessary minor adjustments until desired operation is obtained.
Tighten all nuts and set screws.
M7215
IN+
IN–
1
OUT
+
1 DOTTED LINE REPRESENTS INTERNAL
CONNECTIONS OF THE M7215 ACTUATOR.
Remove crank arm (secured with two screws) from the
motor hub.
NOTE: Crank arm position is adjustable in eight degree
increments.
4.
5.
L2
–
IMPORTANT
Position crank arm on hub so it does not strike motor
mounting surface during any portion of full stroke.
See Fig. 8.
3.
TR
OUT
Mount motor with the shaft horizontal to ensure maximum life.
NOTE: Operation in other positions is possible when
required by the application.
2.
L1
2-10
+
VDC
CONTROL
–
Locate motor as close as possible to the equipment to be
controlled. Refer to Fig. 4 for mounting dimensions.
1.
MAXIMUM
CLOSED
POSITION
1
M17365
Fig. 9. Typical M7215 wiring.
C7046C Discharge Air Temperature
Sensor
The sensor assembly consists of an aluminum sensor probe
(element housed internally) with attached flange that can be
mounted on a flat duct or plenum surface, or in a 2 in. by 4 in.
(51 by 102 mm) junction box, using two no. 8 screws.
Connections to the sensor are made through two 6 in. (152
mm) leadwires.
Location
Locate the sensor in the air duct or plenum where it can
sample average air temperature. Avoid locations where air
stratification can cause sensing errors.
Mounting
To mount the C7046C Sensor on a flat duct or plenum surface
(see Fig. 10):
63-2484—03
8
SOLID STATE ECONOMIZER SYSTEM
1.
Cut a 1/2 in. (13 mm) hole in the duct or plenum surface
at the desired location.
2. Insert the sensor probe into the duct or plenum hole
until the flange rests against the duct or plenum wall.
3. If necessary, use the flange as a template to mark and
drill two holes for no. 8 mounting screws.
4. Fasten the sensor to the duct or plenum surface with
the two no. 8 sheet metal screws (not provided).
To mount the C7046C Sensor in a junction box (see Fig. 11):
1.
2.
3.
4.
SYSTEM DUCT OR PLENUM
NO. 8
MOUNTING
SCREWS (2)
FLANGE
SENSOR PROBE
Cut a 1/2 in. (13 mm) hole in the duct or plenum surface
at the desired location.
Remove the center rear knockout from the junction box
and insert the sensor probe through the knockout with
the flange flat against the junction box.
Using the flange as a template, mark and drill two holes
in the junction box and the duct or plenum surface for
no. 8 mounting screws.
Insert the sensor probe through both the junction box
knockout and the 1/2 in. (13 mm) hole drilled in the duct
or plenum and fasten the junction box and sensor to the
duct or plenum surface with the two no. 8 sheet metal
screws (not provided).
1
TO APPROPRIATE
SYSTEM COMPONENTS
(SEE WIRING DIAGRAM)
1
SENSOR WIRES WITH
2 SOLDERLESS
CONNECTORS
SCREWS NOT PROVIDED.
M9086
Fig. 10. Mounting C7046C Air Temperature Sensor on
duct or plenum.
STANDARD 2 X 4 (51 X 102)
OUTLET BOX (OPTIONAL)
SENSOR PROBE
FLANGE
CONNECTOR
AND
LOCKNUT
BLANK
FACEPLATE
(OPTIONAL)
TO APPROPRIATE
SYSTEM COMPONENTS
(SEE WIRING DIAGRAM)
1
SENSOR WIRES WITH 2
SOLDERLESS CONNECTORS
1
SYSTEM DUCT OR PLENUM
M9088
SCREWS NOT PROVIDED.
Fig. 11. Mounting C7046C Discharge Air Temperature Sensor in junction box.
Wiring
Make sure wiring complies with applicable local codes,
ordinances and regulations.
Connect low voltage wiring from the sensor to the appropriate
system component terminals using solderless connectors as
shown in Fig. 10 and Fig. 11.
CAUTION
Can Cause Electrical Shock or Equipment
Damage.
Disconnect the power supply before connecting the
wiring.
9
63-2484—03
SOLID STATE ECONOMIZER SYSTEM
IMPORTANT
Failure to follow these wiring practices can introduce
electrical interference (noise) that can cause erratic
system operation:
a. Keep wiring at least one foot away from large inductive loads such as motors, line starters, lighting ballasts, and large power distribution panels.
b. Shielded cable is required in installations where
these guidelines cannot be met.
c. Ground shield only to grounded controller case.
d. Make good physical wiring connections to ensure
good electrical connections.
e. Make sure that building earth ground connections
are not intermittent or missing.
f. Mount sensor only in recommended environment.
MS7503 and MS7505 Damper
Actuators
Location and Mounting
LOCATION
Locate the actuator as close as possible to the equipment to
be controlled. Refer to Fig. 12 for mounting dimensions.
Wiring
Disconnect power supply before connecting wiring to prevent
electrical shock or equipment damage. All wiring must comply
with applicable local codes and ordinances.
Frequency 50/60 Hz
Spring Return Direction By orientation. Actuator can be
flipped.
Rotational Stroke 95 В±3 degrees
Rotational Stroke Adjustment Mechanically limited 5
degree increments
Shaft Adapter Type Self-centering clamping
Compatible Damper Shafts 3/8 to 5/8 inch (9 to 16 mm)
round or 1/4 to 1/2 square (6 to 13 mm)
Mounting Direct Coupled
Auxiliary Switches Available One internal optional
Rated Torque MS7503 27 lb-in. (3 Nm) and MS7505
44 lb-in. (5 Nm)
Maximum Stall Torque MS7503 44 lb-in (5 Nm) and MS7505
75 lb-in. (8.5 Nm)
Spring Return Torque MS7503 27 lb-in. (3 Nm) and MS7505
44 lb-in. (5 Nm)
Maximum Noise Rating, Spring Return (dBA @ 1m) <60 dB
Maximum Noise Rating, Driving (dBA @ 1m) <40 dB
Environmental Rating NEMA2; IP54, Flame Resistance
UL94-5VA
Ambient Temperature Range 22В°F to +3В°F (3В°C to +55В°C)
Storage Temperature Range -40В°F to +150В°F (-40В°C to
+65В°C)
Operating Humidity Range (% RH) 5 to 95% RH,
noncondensing
Materials Plenum rated plastic housing and access cover
Weight 3.5 lb (1.60 kg)
Approvals: CE: EN60730-1; Low voltage directive 73/23/EEC
Underwriters Laboratories, Inc. UL60730-1, UL1097 for
Double Insulation
Includes Mounting Bracket, Self-Centering Shaft Adapter
T6031H THERMOSTAT
1-9/16
(40)
3-55/64 (98)
3-5/32 (80)
2-27/64 (61)
1-15/16
(49)
47/64
(19)
Location and Mounting
1-1/8
(29)
The T6031H Thermostat mounts either vertically or
horizontally on a wall or panel. Locate the remote bulb as far
from the controller as capillary tubing allows.
1-1/16
(27)
Mounting Sensing Elements
T6031H: Install the bulb in the return airflow where air of
average temperature can circulate around it.
4-9/16
(116) 6-61/64
(177)
IMPORTANT
Do not overtighten clamps to the point of distorting
the sensor bulb because overtightening causes a
significant shift in bulb calibration.
4-9/16
(116)
Mounting Thermostat
Mount the thermostat using the back mounting plate as shown
in Fig. 5.
2-1/64
(55)
M27712
Wiring
Fig. 12. MS7503 and MS7505 Dimensions Diagram.
Dimensions, Approximate 6.95 in. high x 3.86 in. wide x
3.16 in. deep (177 mm high x 98 mm wide x 80 mm deep)
Fail Safe Mode Spring Return
Electrical Connections Field wiring 18 AWG (0.5 mm) to 14
AWG (1.5 mm) conductors (stranded or solid) and up to 2 14 AWG (1.5 mm) conductors (stranded) to screw terminals, located under the removable access cover.
63-2484—03
10
CAUTION
Can Cause Electrical Shock or Equipment
Damage.
Disconnect power supply before connecting wiring.
SOLID STATE ECONOMIZER SYSTEM
Disconnect the power supply before connecting wiring to
prevent electrical shock and equipment damage. All wiring
must comply with applicable local codes and ordinances.
CAUTION
Equipment Damage Hazard.
Mounting screws longer than 5/8 in. can damage
internal motor components.
When mounting the module to an M7215 or M7415
use only the included #6 5/8 in. thread-forming screw.
Refer to Fig. 13 and the wiring diagrams furnished with the
system equipment to complete the wiring.
M7415, M7405 OR
M8405 ACTUATOR
TEMPERATURE
RISE
SETPOINT
SWITCH
DIFFERENTIAL
W
SETPOINT
FOR T6031H
BREAKS R-B;
MAKES R-W
ON RISE
MAKES R-B;
BREAKS R-W
ON FALL
B
R
R AND W LOCATIONS
DEPEND ON MODEL
AND CONSTRUCTION
W7459
ECONOMIZER PACKAGE
M9089
M9091
Fig. 14. Mounting W7459 on M7415 or M8405 Damper
Actuator.
Fig. 13. T6031H switch terminal arrangement and
switching.
W7459A,C AND W7212A,C Solid
State Economizer Logic Module
M7215 DAMPER MOTOR
Location and Mounting W7459
Economizer Logic Module
Mount the W7459 Economizer Logic Module on the side of
the M7415 or M8405 Damper Actuator. When planning the
installation, allow enough clearance for maintenance and
service. Install the W7459 Economizer Logic Module where it
is protected from rain and snow. One mounting screw is
supplied to secure the W7459 to the actuator (after the
actuator is mounted). See Fig. 14.
ECONOMIZER
LOGIC MODULE
Location and Mounting W7212
The logic modules mount on an M7215 or a sheet metal duct
or panel. When planning the installation, allow enough
clearance for maintenance and service (see Fig. 15 and Fig.
16 for dimensions). Mount device in a location protected from
rain, snow and direct sunlight. Secure device to sheet metal
using the two supplied mounting screws.
11
5/8 INCH SCREW INCLUDED WITH LOGIC MODULE. M20717B
Fig. 15. Direct mounting of W7212 module.
63-2484—03
SOLID STATE ECONOMIZER SYSTEM
measured. Use either a discharge or a mixed air sensor to
provide input to the economizer module through T and T1
Terminals.
4500
RESISTANCE (OHMS)
4000
3500
3,000 OHMS AT
77F (25C)
3000
2500
2000
1500
M20601
1000
55
Fig. 16. Mounting the W7212 module on sheet metal.
60
15
C7400 Enthalpy Sensor and C7660
Temperature Sensor Location and
Mounting
65
70
20
75
25
80
85
90
30
95
35
TEMPERATURE (DEGREES)
100
F
C
M9099
Fig. 17. C7046C and C7150B Air Temperature Sensors
resistance versus temperature.
Outdoor air sensing: Mount the C7400 Enthalpy Sensor or
C7660 Temperature Sensor in any orientation where it is
exposed to freely circulating air but protected from rain, snow
and direct sunlight.
C7400 Solid State Enthalpy Sensor
Return air sensing: For differential enthalpy control, a second
C7400 Enthalpy Sensor is connected to the W7459 or W7212.
Mount the second sensor in the return air duct as far as
possible from the outdoor air sensor. C7400A sensors are
used with W7212A, W7213, and W7214 economizers. The
C7400C is used with W7212C economizers.
Figure 18 is a partial psychrometric chart with single C7400A
Sensor and W7459A Economizer Logic Module performance
curves. The curves illustrate the reset in the temperature
control point due to changes in relative humidity.
Wiring
The C7400 Solid State Enthalpy Sensor is used with a solid
state economizer control and damper actuator to proportion
an outdoor air damper in a ventilation system.
Figure 19 is a partial psychrometric chart with single C7400C
sensor and W7212C economizer logic module performance
curves. Note the C7400C and W7212C have the additional E
curve.
The enthalpy control setpoint A, B, C, or D combines
temperature and humidity conditions, resulting in the control
curve shown in Fig. 18. When the enthalpy or outdoor air is
below (left of) the appropriate curve, the outdoor air damper
can proportion open on a call for cooling. If outdoor air
enthalpy rises above (to the right of) the control curve, the
outdoor air damper closes to the minimum position.
CAUTION
Can Cause Electrical Shock or Equipment
Damage.
Disconnect power supply before connecting wiring.
Disconnect the power supply before connecting wiring to
prevent electrical shock or equipment damage. All wiring must
comply with applicable local codes, ordinances and
regulations.
For differential enthalpy, turn the control setpoint to D (fully
clockwise). If outdoor air enthalpy is lower than return air
enthalpy, the outdoor air damper proportions open on a call for
cooling.
OPERATION AND CHECKOUT
If outdoor air is higher enthalpy than return air enthalpy, the
outdoor air damper closes to minimum position. Differential
enthalpy control provides energy savings and increased
comfort by using the air with the lowest enthalpy.
C7046C (Discharge) and C7150B (Mixed)
Air Sensors
If outdoor air enthalpy and return air enthalpy are equal, the
outdoor air damper proportions open on a call for cooling.
The C7046C discharge air sensor is applied following the coils
in the supply air to the conditioned space. The C7150B mixed
air sensor is mounted in the mixing box, where the “best”
combination of outdoor and return air temperature can be
63-2484—03
12
The relationship between the C7400A Sensor output current
and relative humidity is shown in Fig. 20.
The relationship between the C7400C sensor output current
and relative humidity is shown in Fig. 22.
SOLID STATE ECONOMIZER SYSTEM
C7660 Solid State Temperature Sensor
When outdoor air temperature is higher than changeover set
point, the outdoor air damper closes to the minimum position.
When the outdoor air temperature is below the changeover
set point, the outdoor air damper proportions open on a call
for cooling.
The C7660 Solid State Temperature Sensor is used with a
solid state economizer control and damper actuator to
proportion an outdoor air damper in a ventilation system.
The dip switch settings for the C7660 Sensor are shown in
Fig. 21.
46
85
90
95 100 105 110
(29) (32) (35) (38) (41) (43)
44
CONTROL CONTROL POINT
APPROX. В°F (В°C)
CURVE
AT 50% RH
42
(%
)
R
AI
UM
EH
LA
TIV
RE
30
16
12
14
50
(10)
40
(4)
45
(7)
A
30
18
55
(13) B
40
20
60
(16)
50
22
60
24
70
10
0
90
26
65
(18)
80
28
—
BT
U
70
(21)
AL
PY
IDI
TY
38
RY
36
32
PE
R
PO
UN
34 D D
75
(24)
EN
TH
80
(27)
40
73 (23)
70 (21)
67 (19)
63 (17)
A
B
C
D
C
20
D
10
35
(2)
B A
D C
35
(2)
40
(4)
45
(7)
50
(10)
1
55
60
65
75
80
85
90
95 100 105 110
70
(13) (16) (18) (21) (24) (27) (29) (32) (35) (38) (41) (43)
APPROXIMATE DRY BULB TEMPERATURE— °F (°C)
1
HIGH LIMIT CURVE FOR W7210D, W7212A, W7213, W7214, W7340B.
M11160D
Fig. 18. Partial psychrometric chart with single C7400A Solid State Enthalpy Sensor and W7212A or W7459 Solid State
Economizer Logic Module performance curves.
13
63-2484—03
SOLID STATE ECONOMIZER SYSTEM
46
85
90
95 100 105 110
(29) (32) (35) (38) (41) (43)
44
CONTROL CONTROL POINT
APPROX. В°F (В°C)
CURVE
AT 50% RH
42
80
(27)
IDI
UM
32
PE
R
30
U
70
(21)
16
12
14
50
(10)
40
(4)
45
(7)
A
30
18
55
(13) B
40
20
60
(16)
50
22
60
70
80
26
65
(18)
24
EN
T
HA
10
0
90
28
LP
Y—
BT
RE
LA
TIV
EH
36
75
(24)
PO
UN
34 D D
RY
TY
38
AI
R
(%
)
40
73 (23)
70 (21)
67 (19)
63 (17)
55 (13)
A
B
C
D
E
C
20
D
E
10
35
(2)
E
35
(2)
40
(4)
45
(7)
50
(10)
B A
D C
1
55
60
65
75
80
85
90
95 100 105 110
70
(13) (16) (18) (21) (24) (27) (29) (32) (35) (38) (41) (43)
APPROXIMATE DRY BULB TEMPERATURE— °F (°C)
1
M23879A
HIGH LIMIT CURVE FOR W7210D, W7212, W7213, W7214, W7340C.
Fig. 19. Partial psychrometric chart with single C7400C enthalpy sensor and the W7212 logic module A, B, C, D, and E
performance curves.
C7400A OUTPUT CURRENT
100
DIP SWITCH CHANGEOVER
POSITION TEMPERATURE
ON
OFF
90
ON
OFF
70
60
ON
OFF
A
4m
A
6m
A
8m
mA
10
mA
12
mA
14
mA
16
mA
18
mA
20
PERCENT RH
80
50
ON
OFF
40
ON
OFF
30
ON
OFF
20
ON
OFF
10
40
(4)
50
(10)
60
(16)
70
(21)
80
(27)
TEMPERATURE F (C)
90
(32)
100
(38)
ON
OFF
M9101
Fig. 20. C7400A Sensor output current vs. relative humidity.
63-2484—03
14
1 2 3
1 2 3
1 2 3
1 2 3
1 2 3
1 2 3
1 2 3
1 2 3
48ВєF
53ВєF
55ВєF
58ВєF
63ВєF
68ВєF
73ВєF
78ВєF
M27636
Fig. 21. C7660 Temperature Sensor Dip Switch Settings.
SOLID STATE ECONOMIZER SYSTEM
100
c. Mid-position—when the controller circuit closes to
provide 24 Vac to terminals T and X, the actuator is
energized to run to the adjustable mid-position (minimum position).
Adjustable minimum position can be reached from either the
fully closed or fully open position. From fully closed, the
actuator drives open to the minimum position; from fully open,
the actuator spring-returns to minimum position.
C7400C SENSOR OUTPUT CURRENT
90
70
W7459A,C Solid State Economizer
Logic Module
A
A
4m
6m
A
8m
A
10 m
A
12 m
A
14 m
A
16 m
A
A
50
20 m
60
18 m
PERCENT RF
80
40
30
20
10
40
(4)
50
(10)
60
(16)
70
(21)
80
(27)
TEMPERATURE ВєF ( ВєC)
90
(32)
100
(38)
M27816
Fig. 22. C7400C Sensor output current vs. relative humidity.
M7415 Damper Actuator
Single M7415 Damper Actuator accepts thermistor sensor
input from a C7046A or a C7150B Mixed Air Sensor mounted
in discharge or mixed air duct.
During the occupied period, on a call for cooling, when
outdoor air temperature or enthalpy conditions are low, the
M7415 Actuator proportions to maintain between 50В°F (10В°C)
and 56В°F (13В°C) at the thermistor sensor.
If the mixed or discharge temperature is above 56В°F (13В°C),
the M7415 Actuator opens to admit additional outdoor air until
the temperature returns to the 50В°F (10В°C) to 56В°F (13В°C)
range. If the mixed or discharge air temperature is below 50В°F
(10В°C), the actuator proportions closed, shutting the outdoor
air damper until the temperature returns to the 50В°F (10В°C) to
56В°F (13В°C) range. During the occupied period, the actuator
does not close past the minimum position.
If the fully open M7415 Actuator cannot satisfy the space
demand, mechanical cooling is sequenced on.
During the unoccupied period, the M7415 Actuator overrides
the minimum position setting and drives fully closed. On a loss
of power, the actuator spring-returns fully closed.
The purpose of an economizer is to use outdoor air for cooling
whenever possible, to reduce air conditioner compressor
operation. The W7459 Economizer System, when wired as
shown in Fig. 29 or Fig. 30, responds to a signal from the
cooling thermostat. This system uses a C7400A Enthalpy
Sensor or a C7660 Temperature Sensor. It responds to both
dry bulb temperature and humidity, allowing the use of
outdoor air at higher temperatures for free cooling when the
humidity is low.
The economizer functions as a true first stage of cooling and
provides maximum fuel economy during the cooling cycle.
The economizer is automatically locked out during heating. It
holds the outdoor air damper at the minimum position setting.
On a call for cooling by the space thermostat, the system
operates as follows:
When the enthalpy or temperature of the outdoor air is below
the setpoint, the outdoor air damper is proportioned open (and
the return air damper is proportioned closed) to maintain
between 50В°F and 56В°F (10В°C and 13В°C) at the mixed/
discharge air sensor. During economizer operation, the
mechanical cooling is operated by stage 2 cooling on the
space thermostat.
When the enthalpy or temperature of the outdoor air is above
the setpoint, the outdoor air damper closes to its minimum
position. A call for cooling from the space thermostat turns on
the mechanical cooling.
During the unoccupied period, the M7415 Damper Actuator
spring-returns the outdoor air damper to the fully closed
position.
W7212A Economizer Logic Module
If terminals P and P1 are jumpered, the M7415 drives fully
open; however, if terminals P and P1 are left open, the M7415
drives fully closed. The M7415 minimum position adjustment
drives the motor open when the resistance across P and P1 is
minimal. Increasing the amount of resistance across these
terminals drives the actuator closed.
W7212A economizer logic module used with C7400A or
C7400C (used with W7212C economizer modules) enthalpy
sensors, M7215, MS7503, or MS7505 damper actuators and
C7232 CO2 sensors to proportion outdoor and return air
dampers from economizer and demand control ventilation in
commercial HVAC equipment.
M8405 Damper Actuator
W7212A Optional Applications
An spst low-voltage controller is used to control the M8405
Actuator as follows:
HEAT PUMP CHANGEOVER (W7213, W7214 ONLY)
In heat pump applications, the controller must have control of
the changeover valve. To provide the logic module with the
information necessary for proper information, there must be a
connection to the logic module O/B terminal. This terminal
alerts the logic module as to when the system operates in
cooling (the only time the economizer is used).
a. Fully open—when the controller circuit closes to
provide 24 Vac to terminals D and T, the actuator is
energized and runs fully open.
b. Fully closed—when the controller circuit opens,
power is removed from terminals D and T, and the
actuator spring-returns to the fully closed position.
15
63-2484—03
SOLID STATE ECONOMIZER SYSTEM
W7213 (CHANGEOVER TERMINAL B)
Connect the B terminal according to the following details:
— 24V power to B: System is in heating mode.
— No power to B: System is in cooling mode.
R
T
C7150
W7214 (CHANGEOVER TERMINAL O)
Connect the O terminal according to the following details:
— 24V power to O: System is in cooling mode.
— No power to O: System is in heating mode.
M7415
SETTINGS AND ADJUSTMENTS
Adjusting Minimum Damper Position
The minimum position potentiometer keeps the outdoor air
damper from completely closing during system operation to
allow ventilation.
The M7415 Damper Actuator is adjusted for desired minimum
position using a Q709 Actuator Mounted Minimum Position
Potentiometer and/or a remote S963B1136 Manual
Potentiometer. The M8405 Damper Actuator has an integral
thumbwheel for minimum position adjustment.
M7415 Minimum Position Adjustment
2.
3.
4.
Run actuator to fully closed position and disconnect 24
Vac from terminals TR and TR1.
Connect minimum position potentiometer to terminals P
and P1 (T and T1 are disconnected).
Reconnect 24 Vac to terminals TR and TR1 and adjust
the potentiometer for the desired minimum position.
When the Q709 Actuator Mounted Minimum Position
Potentiometer is used and a remote potentiometer is
not connected in series, jumper terminals P and P1 on
the Q709A.
M8405 Minimum Position Adjustment
1.
2.
RESISTOR VALUE (OHMS)
681
2760
3650
4420
4750
4870
NO RESISTOR
C7150B SETPOINT В°F (В°C)
54.5—61.5 (12.5—16.4)
68.4—80.1 (20.3—26.8)
87.4—110.3 (30.8—45.5)
104.7—150 (40.4—65.5)
116—194 (46.7—90)
120—300 (49—149)
50—56 (10—13.3)
USE 1%, 1/8 W OR HIGHER RESISTOR
M1544C
Fig. 23. Increasing C7150B setpoint.
M7415 and M8405 Damper Actuators
Adjusting Minimum Position
(Ventilation)
1.
T1
Connect the 24 Vac to the actuator at terminals T and X
(D is not connected).
Adjust the thumbwheel on the actuator for desired
minimum position.
Discharge Air Temperature Setpoint
Adjustment—M7415 Only
This temperature range can be adjusted either up or down by
wiring a resistor in series (to increase the setpoint) or in
parallel (to decrease the setpoint) with the C7150B,
depending on the application. See Fig. 23 and Fig. 24 for
explanation.
T
R
C7150
T1
M7415
RESISTOR VALUE (OHMS)
18.2K
24K
30K
NO RESISTOR
C7150B SETPOINT В°F (В°C)
36—44 (2.2—6.7)
39.5—47 (4.0—8.3)
42—49 (5.6—9.4)
50—56 (10—13.3)
USE 1%, 1/8 W OR HIGHER RESISTOR
M1545C
Fig. 24. Decreasing C7150B setpoint.
W7459A,C Solid State Economizer
Logic Module
Two potentiometers with small screwdriver slots for
adjustment are located on the face of the module.
Minimum Position Adjustment
W7459A ECONOMIZER LOGIC MODULE
1. Make sure the factory-installed jumper is in place
across terminals P and P1 (terminals T and T1 are
disconnected.
2. Connect 24 Vac at terminals TR and TR1 and adjust the
potentiometer on the face of the W7459A with a small
screwdriver for desired minimum position.
W7459C ECONOMIZER LOGIC MODULE
1. Connect 24 Vac at terminals TR and X (D is not connected).
2. Adjust thumbwheel on motor for desired minimum position.
Enthalpy Changeover Setpoint
Single enthalpy: the enthalpy changeover setpoint is set to
return the outdoor air damper to the minimum position when
the enthalpy rises above its setpoint. The enthalpy setpoint
scale markings, located on the W7459, are A, B, C, D; see
Fig. 18 for the corresponding control point. The factoryinstalled 620-ohm jumper must be in place across terminals +
and SR.
63-2484—03
16
SOLID STATE ECONOMIZER SYSTEM
SEQUENCE OF OPERATION
ENTHALPY
CHANGEOVER
SETPOINT
Economizer Sequence of Operation
(WITH AND WITHOUT DIFFERENTIAL ENTHALPY)
The economizer operating sequence for both the modulating
and the three-position control systems are identical when the
outdoor enthalpy temperature is above the mixed air setpoint
of 55В°F (13В°C). The operating sequence for both, using a
standard two-stage thermostat is:
1
1.
MINIMUM
DAMPER
POSITION
SETTING
2.
LED LIGHTS
WHEN OUTDOOR
AIR IS SUITABLE
FOR FREE COOLING
1
MINIMUM DAMPER POSITION ADJUSTMENT
IS PRESENT ONLY ON W7459A,D MODELS.
3.
M9098B
4.
Fig. 25. Location of enthalpy setpoint potentiometer,
minimum position potentiometer and LED.
Differential Enthalpy Changeover
Setting
(USE THIS OPTION ONLY WITH TWO-STAGE COOLING
THERMOSTATS.)
Differential enthalpy control uses two C7400A Enthalpy
Sensors connected to one W7459 Solid State Economizer
Logic Module. Differential dry bulb is not an option for these
economizers.
5.
The setpoint scale markings, located on the W7459, are
A,B,C and D. Turn the setpoint potentiometer fully clockwise
to the D setting. The economizer selects the air that has lower
enthalpy or temperature for cooling; for example, if outdoor air
has lower enthalpy or temperature than return air, the outdoor
air damper is opened to bring in outdoor air for free cooling.
6.
Remote Minimum Position Control
Remote control of outdoor air dampers is desirable when
requiring temporary additional ventilation. The addition of a
S963B1128 Remote Potentiometer allows occupants to open
or close the dampers beyond minimum position for modified
ventilation.
17
The first stage of the thermostat signals a need for
cooling.
The W7459 Solid State Economizer Logic Module
begins to make decisions regarding the unit/
economizer operation.
a. On the standard (non-differential) economizers, the
logic module checks the outdoor air C7400 Enthalpy
Sensor or C7660 Temperature Sensor to determine
if the enthalpy or temperature is below the setpoint.
b. On the differential economizers, the logic module
checks to determine if the outdoor air temperature is
below the return air temperature.
If the logic module uses the outside air for cooling, the
mixed air sensor prevents the entering air from going
below 50В°F (10В°C).
a. On the modulating system, the control closes the
outside air damper and opens the return air damper
to mix the outside air and return air to maintain 50°–
55°F (10°–13°C).
b. On the three-position system, the mixed air sensor
switch opens, closing the fresh air damper until the
mixed air sensor temperature returns above 55В°F
(13В°C), closing the switch and re-opening the outside air damper.
a. If the logic module senses that the outside air is not
suitable for cooling, the air conditioning unit compressor is energized and the space is cooled with
refrigerated air.
b. On the two-stage thermostat, the economizer is the
first stage if the outside air temperature is suitable
for cooling. The compressor on the unit is energized
if the second stage of the thermostat is energized,
thereby creating an integrated economizer.
Refer to Table 4 for further information on outside air
damper positions.
63-2484—03
SOLID STATE ECONOMIZER SYSTEM
Table 4. Outdoor air damper positions.
Outside
Temperature1
Standard Economizer Damper Position
2
Modulating
3-Position
2
Return
Temperature1
Differential Enthalpy Damper Position
Modulating2,3
3-Position2,3
80
Closed
Closed
80
Closed
Closed
85
Open
Open
75
Closed
Closed
75
Closed
Closed
80
Open
Open
70
Open
Open
75
Open
Open
65
Open
Open
60
Open
Open
75
Open
Open
55
Open
Open
75
Open
Open
54 and down
Modulating
Opening/Closing
75
Modulating
Opening/Closing
1
Standard economizer position based on enthalpy control set on the A setting and 50% relative humidity.
Closed position is either the minimum position or fully closed, depending on the job setting.
3
Opening/closing is dependent on the mixed air temperature.
2
OPERATION: W7212
The purpose of the economizer is to use outdoor air for
cooling, whenever possible, to reduce compressor operation.
Power at the N terminal determines the Occupied/Unoccupied
setting:
— W7212A:
• 24 Vac (Occupied).
• No power (Unoccupied).
When wired as shown in Fig. 31– Fig. 36, the logic module
responds to the cooling thermostat signal. The system uses
C7400A (or C7400C with W7212C) Solid State Enthalpy
Changeover Sensor(s) or C7660 Dry Bulb Temperature
Sensor. The C7400 responds to both dry bulb temperature
and humidity, allowing use of outdoor air at higher
temperatures for free cooling when humidity is low. The
C7660 responds only to dry bulb temperature; use only in dry,
arid climates and in single dry bulb changeover. Do not use
C7660 for differential dry bulb. If differential control is required,
use enthalpy (C7400).
The logic module functions as a true first stage of cooling
providing maximum energy economy during the cooling cycle.
It automatically locks out free cooling during heating; holding
the outdoor air damper at the minimum position setting.
— W7212C:
• 24 Vac (Occupied).
• No power (Unoccupied).
• Returns to minimum position on failure of CO2
sensor.
— W7213,W7214:
• W7213 (CHANGEOVER TERMINAL B)
—24V power to B: System is in heating mode.
—No power to B: System is in cooling mode.
• W7214 (CHANGEOVER TERMINAL O)
—24V power to O: System is in cooling mode.
—No power to O: System is in heating mode.
The logic module can operate as either a basic free cooling
controller, or it can incorporate additional functions. Table 5
details the input/output (I/O) logic of the module.
S963B1128 REMOTE
POTENTIOMETER
NOTE: When module is operating in Occupied mode, the
minimum position is defined by the potentiometer.
When the module is operating in Unoccupied mode,
and there is no call for cooling, the damper drives
fully closed.
CW
CLOSE
W
R
MINIMUM
POSITION
ADJUSTMENT
P1
B
P
CW
ECONOMIZER
M20603A
Fig. 26. S963B1128 Remote Potentiometer used with logic
module for remote damper control.
63-2484—03
18
SOLID STATE ECONOMIZER SYSTEM
Table 5. W7212 Economizer I/O Logic.
INPUTS
OUTPUTS
Enthalpya
Demand Control
Ventilation (DCV)
Below set (DCV
LED Off)
Above set (DCV
LED On)
N Terminalb
Compressor
Occupiedb
Outdoor
Return
Y1
Y2
Stage 1 Stage 2
Unoccupiedb
Damper
High (Free
Low
Cooling LED Off)
On
On
On
On
On
Off
On
Off
Minimum position
Off
Off
Off
Off
Low (Free
High
Cooling LED On)
On
On
On
Off
On
Off
Off
Off
Modulatingc (between Modulatingc (between
min. position and full- closed and full-open)
open)
Off
Off
Off
Off
Minimum position
High (Free
Low
Cooling LED Off)
On
On
On
On
On
Off
On
Off
Off
Off
Off
Off
Modulatingd (between Modulatingd (between
min. position and DCV closed and DCV
maximum)
maximum)
Low (Free
High
Cooling LED On)
On
On
On
Off
On
Off
Off
Off
Off
Off
Off
Off
Modulatinge
Closed
Closed
Modulatingf
a
For single enthalpy control, the module compares outdoor enthalpy to the ABCD setpoint.
Power at N terminal determines Occupied/Unoccupied setting:
• W7212: 24 Vac (Occupied), no power (Unoccupied). W7212C returns to minimum position on CO2 sensor failure.
• W7213,W7214: No power (Occupied), 24 Vac (Unoccupied).
c Modulation is based on the mixed air sensor signal.
d Modulation is based on the DCV signal.
e Modulation is based on the greater of DCV and mixed air sensor signals, between minimum position and either maximum
position (DCV) or fully open (mixed air signal).
f Modulation is based on the greater of DCV and mixed air sensor signals, between closed and either maximum position (DCV)
or fully open (mixed air signal).
b
NOTES:
—
—
—
DCV and Free Cooling have setpoints and LED indications.
For models with a B terminal (W7213):
No power to B: cooling mode, free cool enabled. Module follows logic detailed above.
24V power to B: heating mode, free cool disabled. Actuator drives to minimum position (closed when Unoccupied).
For models with an O terminal (W7214):
24V power to O: cooling mode, free cool enabled. Module follows logic detailed above.
No power to O: heating mode, free cool disabled. Actuator drives to minimum position (closed when Unoccupied).
SETTINGS AND
ADJUSTMENTS: W7212
Potentiometers with small screwdriver adjustment slots,
located on device face, provide adjustments for several
parameters (see Fig. 27 for locations on device):
—
—
—
—
—
CAUTION
Equipment Damage Hazard.
Excessive force can damage potentiometer
controls.
Use a small screwdriver when adjusting enthalpy
changeover and minimum damper position controls.
19
DCV setpoint.
Minimum damper position.
DCV maximum damper position.
Enthalpy changeover.
Exhaust setpoint.
63-2484—03
SOLID STATE ECONOMIZER SYSTEM
Minimum Position Adjustment
For detailed assistance in minimum position selection
reference the Economizer Application Guide (form 63-8594)
Ventilation section. The following provides basic guidelines for
minimum position selection and adjustment:
EXHAUST
FAN SETPOINT
LED LIGHTS
WHEN EXHAUST
CONTACT IS MADE
MINIMUM DAMPER
POSITION SETTING
MAXIMUM DAMPER
DEMAND CONTROL
VENTILATION SETPOINT
LED LIGHTS WHEN
DEMAND CONTROL
VENTILAION INPUT
IS ABOVE SETPOINT
DEMAND CONTROL
VENTILAION SETPOINT
EXH
N1
N
Set
10V
EXH
P1
P
IMPORTANT
• Adjust the minimum position potentiometer to allow
the minimum amount of outdoor air for building effluents, as required by local codes, to enter the building.
• This procedure requires use of a quality thermometer
capable of reading to 0.5В°F (0.25В°C).
Min
Pos
T1
Open
T
DCV
2V
AQ1
SO+
SO
SR+
ENTHALPY
CHANGEOVER SETPOINT
Max
10V
DCV
AQ
SR
LED LIGHTS WHEN
OUTDOOR AIR IS
SUITABLE FOR
FREE COOLING
2V
DCV
2V
Set
10V
NOTE: Make minimum position adjustments with at least a
10В°F (6В°C) temperature difference between outdoor
and return air.
Free
Cool
B
C
A
D
1.
M20604
Fig. 27. Potentiometer and LED locations (W7212 shown).
2.
3.
4.
Demand Control Ventilation Setpoint
The logic module modulates the outdoor damper to provide
ventilation based on the 0/2-10 Vdc DCV. With no cooling
signal, the DCV overrides the outdoor air damper when
ventilation requires additional outdoor air.
5.
6.
Adjusting Minimum and Maximum
Positions
NOTE: Ensure that the sensed air is well-mixed.
7.
The minimum position potentiometer maintains the minimum
outdoor air flow into the building during the occupied period.
The minimum position allows for the building effluents. The
DCV maximum position potentiometer allows the installer to
limit the amount of outdoor air flow into the building when the
DCV overrides the mixed air sensor and allows the proper
ventilation based on occupancy. Setting the DCV maximum
position of the damper prevents the introduction of large
amounts of hot or cold air into the space by preventing the
dampers from opening 100%. Set the DCV maximum position
at the maximum design occupancy.
IMPORTANT
With the DCV maximum position set below the minimum position, the minimum position overrides the
maximum position (negating most DCV functions of
the logic module, as the damper cannot move).
NOTES:
—
—
63-2484—03
Calculate the appropriate mixed air temperature. See
Equation 1. Formula to aid minimum position adjustment.
Disconnect mixed air sensor from terminals T and T1.
Place a jumper across terminals T and T1.
Ensure that either the factory-installed jumper is in place
across terminals P and P1 or, if remote damper position
is required, that it is wired according to Fig. 26 and
turned fully clockwise.
Connect 24 Vac across terminals TR and TR1.
Carefully adjust the potentiometer on the face of the
device with a small screwdriver until the mixed air temperature reaches the calculated value.
When the mixed air sensor takes control based on
an increased requirement for cooling, it overrides
the DCV maximum position potentiometer and
can drive the damper full-open.
If the mixed air temperature drops to 45В°F, the
mixed air sensor overrides the DCV and fully
closes the damper to protect from freezing the hot
or chilled water coils. Control returns to normal
once the mixed air temperature rises to 48В°F.
20
If all minimum and maximum position adjustments are
complete, remove the T-T1 jumper and reconnect the
mixed air sensor.
EQUATION 1. FORMULA TO AID MINIMUM POSITION
ADJUSTMENT.
(TO Г— OA)+(TR Г— RA)= TM
Where:
TO = Outdoor air temperature
OA = Percent of outdoor air
TR = Return air temperature
RA = Percent of return air
TM = Resulting mixed air temperature
NOTE: The following sample calculation uses only Fahrenheit temperature.
EXAMPLE:Assume local codes require 10% outdoor air during occupied conditions, outdoor air is 60В°F and
return air is 75В°F. Under these conditions, what is
the temperature of the mixed air?
(0.1 Г— 60В°F)+(0.9 Г— 75В°F)=6.0В°F + 67.5В°F=73.5В°F
Mixed air will be 73.5В°F when OA is 60В°F and RA is 75В°F with
10 percent outdoor air entering the building.
SOLID STATE ECONOMIZER SYSTEM
DCV Maximum Position Adjustment
1.
2.
3.
4.
5.
Disconnect mixed air sensor from terminals T and T1
and short terminals T and T1.
Connect a jumper between terminals AQ and AQ1.
Connect 24 Vac across terminals TR and TR1.
Adjust the potentiometer on the face of the device with a
small screwdriver for desired maximum position.
If all minimum and maximum position adjustments are
complete, remove the T-T1 jumper and reconnect the
mixed air sensor.
Enthalpy Changeover Setpoint
NOTES:
—
—
EF and EF1 are 24V dry contacts only. An external line voltage contactor is required to operate
the exhaust fan.
When the exhaust fan is deactivated the EF and
EF1 contacts open immediately.
CHECKOUT AND
TROUBLESHOOTING
Tables 6 through 10 provide step-by-step economizer
checkout and troubleshooting steps. See Fig. 25 and Fig. 28
for enthalpy setpoint potentiometer, minimum position
potentiometer and LED locations.
Outdoor Enthalpy Changeover Setpoint
(Single Enthalpy)
The outdoor enthalpy changeover setpoint returns the outdoor
air damper to minimum position when enthalpy rises above its
setpoint. Enthalpy setpoint scale markings, located in the
device, are A, B, C and D. See Fig. 18 for the corresponding
control point. The factory-installed 620-ohm jumper must be in
place across terminals SR and SR+. Temperature and
humidity points to the left of the selected curve will allow the
dampers to open for free cooling.
W7459
B
A
TR
TR1
SO
+
SR
+
ENTHALPY CHANGEOVER
SETPOINT
+
C
D
1
+
2
620 OHM
JUMPER
S
C7400
DC
MILLIAMMETER
Differential Enthalpy Changeover Setting
Differential enthalpy control uses two C7400 Enthalpy
Sensors connected to one logic module. The logic module
compares outdoor air to return air.
LED LIGHTS WHEN
OUTDOOR AIR IS SUITABLE
FOR FREE COOLING
NOTE: Turn the enthalpy setpoint potentiometer fully clockwise to the D setting.
The logic module selects the lower enthalpy air (return or
outdoor) for cooling. For example, when outdoor air has lower
enthalpy than return air, the module calls to open the outdoor
air damper to bring in outdoor air for free cooling.
Exhaust Setpoint
The exhaust setpoint determines when the exhaust fan runs
based on damper position. When the exhaust fan call is
made, the module provides a 60 В±30 second delay before
exhaust fan activation. This delay allows the damper to reach
the appropriate position to avoid unnecessary fan overload.
21
1
INSERT DC MILLIAMMETER BETWEEN SO AND S FOR CHECKOUT
AND TROUBLESHOOTING.
2
JUMPER USED FOR SINGLE ENTHALPY CONTROL.
M9097
Fig. 28. Meter location for checkout and troubleshooting.
63-2484—03
SOLID STATE ECONOMIZER SYSTEM
W7459C ECONOMIZER PACKAGE
M8405 ACTUATOR
M8405
T
APPLY
24VAC T-X
FOR MIN POSN
T-D FOR
MAX POSN
T
MAX
SW
SET
MIN
+
C7400
OUTDOOR
SENSOR
TR
TR1
SO
+
SR
+
7
S
X
D
C7400
RETURN
SENSOR
5
+
1K
UNOCCUPIED
ST6008
TIMER
1
2
3
4
OCCUPIED
T675/T6031 MIXED
AIR CONTROL
55ВЎ F SETPOINT
R
5
S
6
4
2K
X
X
D
D
W
C
Y1
COOL 1
Y2
COOL 2
W2
W2
HEAT 2
W1
W1
HEAT 1
Y1
W
R
Y2
T6031 AMBIENT
LOCKOUT CONTROL
50ВЎ F SETPOINT
FAN
DELAY
RELAY
X
6
FDR
G
FAN
G
RH
FDR
2
R
RC
HVAC EQUIPMENT
TERMINAL STRIP
T7300 OR T874
THERMOSTAT
1
3
L2
L1
(HOT)
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
MOTOR SPRING-RETURNS CLOSED WHEN FAN IS NOT RUNNING.
3
ENSURE THAT EQUIPMENT TRANSFORMER IS SIZED TO HANDLE THE EXTRA LOAD OF THE ECONOMIZER AND ACTUATOR.
4
RELAYS 1K AND 2K ACTUATE WHEN THE ENTHALPY SENSED BY THE C7400 IS HIGHER THAN THE ENTHALPY SETPOINT A-D.
5
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD BE REMOVED ONLY IF A C7400 ENTHALPY SENSOR
IS ADDED TO SR AND + FOR DIFFERENTIAL ENTHALPY.
6
FOR T7300 ONLY.
7
TR1 IS HOT ON W7459C. TR1 IS GROUND ON ALL OTHER MODELS OF W7459.
M3865C
Fig. 29. M8405A Damper Actuator used in two-stage cooling system with differential enthalpy changeover and W7459C
Economizer.
63-2484—03
22
SOLID STATE ECONOMIZER SYSTEM
W7459A ECONOMIZER PACKAGE
M7415 ACTUATOR
TR
C7400
OUTDOOR
AIR
ENTHALPY
SENSOR
TR
TR1
SO
+
SR
+
+
TR1 24 VAC
S
620 OHM
RESISTOR
6
5
1
2
3
4
T
T1
P
P1
1K
5
1S
2K
4
T
C7150B MIXED
AIR OR
C7046A
DISCHARGE
AIR SENSOR
UNOCCUPIED 8
ST6008
TIMER
T1
1S1
P1
MINIMUM POSITION
ADJUSTMENT
OCCUPIED
P
MINIMUM
POSITION
C
M7415
Y1
COOL 1
Y2
COOL 2
W2
W2
HEAT 2
W1
W1
HEAT 1
Y1
W
Y2
R
T6031 AMBIENT
LOCKOUT
CONTROL
50 F SETPOINT
TR
24 VAC
SENSOR
TR1
T
T1
P1
MIN
POS
P
FAN
DELAY
RELAY
G
7
MIXED
AIR
SENSOR
X
FDR
FAN
G
RH
FDR
2
R
RC
T7300 OR T874
THERMOSTAT
HVAC EQUIPMENT
TERMINAL STRIP
1
3
L2
L1
(HOT)
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
MOTOR SPRING-RETURNS CLOSED WHEN FAN IS NOT RUNNING.
3
ENSURE THAT EQUIPMENT TRANSFORMER IS SIZED TO HANDLE THE EXTRA LOAD OF THE ECONOMIZER AND ACTUATOR.
4
1S IS AN ELECTRONIC SWITCH THAT CLOSES WHEN POWERED BY A 24 VAC INPUT.
5
RELAYS 1K AND 2K ACTUATE WHEN THE ENTHALPY SENSED BY THE C7400 IS HIGHER THAN THE ENTHALPY SETPOINT A-D.
6
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD BE REMOVED ONLY IF A C7400 ENTHALPY SENSOR
IS ADDED TO SR AND + FOR DIFFERENTIAL ENTHALPY.
7
FOR T7300 ONLY.
8
WITH T7300, USE CONTACTS A1 AND A2 INSTEAD OF S7005 TIMER.
M10115A
Fig. 30. W7459A/C7400 used in two-stage cooling system with single enthalpy changeover and with M7415 Actuator.
23
63-2484—03
SOLID STATE ECONOMIZER SYSTEM
TR
TR1
24
Vac
HOT
24 Vac
COM
N1
N
MINIMUM POSITION
ADJUSTMENT
P1
C7150B MIXED
AIR OR C7046A
DISCHARGE
AIR SENSOR
P
24 VAC HOT
T1
+
–
T
–
AQ1
+
SO+
2-10 VDC CONTROL
SIGNAL INPUT
1
0/2-10 VDC
INDOOR AIR
SENSOR
24 VAC COM
2
5
AQ
3
4
EF
EF1
SO
SR+
M7215
SR
C7400
OUTDOOR
AIR
ENTHALPY
SENSOR
+
S
W7212
3
5
620 OHM
RESISTOR
L1
(HOT)
L2
EXHAUST
FAN
Y1
C
Y2
Y1
COOL 1
W2
Y2
COOL 2
W2
HEAT 2
W1
HEAT 1
W1
A2
A1
4
A2
G
A1
RH
G
FAN
RC
R
X
HVAC EQUIPMENT
TERMINAL STRIP
T7300/Q7300
THERMOSTAT
1
L1
(HOT)
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
ENSURE THAT TRANSFORMER IS SIZED TO HANDLE THE EXTRA LOAD OF THE ECONOMIZER AND ACTUATOR. USE THE SAME
TRANSFORMER FOR T7300 AND ECONOMIZER.
3
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD NOT BE REMOVED. DIFFERENTIAL ENTHALPY NOT RECOMMENDED FOR USE
WITH SINGLE-STAGE COOLING SYSTEMS OR SINGLE-STAGE COOLING THERMOSTATS.
4
T7300 TERMINALS A1 AND A2 ARE CONNECTED WHEN THERMOSTAT IS IN THE OCCUPIED MODE.
5
EF AND EF1 ARE DRY CONTACTS IN THE LOGIC MODULE.
Fig. 31. W7212 used with M7215 Damper Motor and T7300 Thermostat.
63-2484—03
2
L2
24
M20716D
SOLID STATE ECONOMIZER SYSTEM
TR
TR1
24
Vac
HOT
24 Vac
COM
N1
N
MINIMUM POSITION
ADJUSTMENT
P1
C7150B MIXED
AIR OR C7046A
DISCHARGE
AIR SENSOR
P
24 VAC HOT
T1
+
–
T
–
AQ1
+
SO+
2-10 VDC CONTROL
SIGNAL INPUT
1
0/2-10 VDC
INDOOR AIR
SENSOR
24 VAC COM
2
5
AQ
3
4
EF
EF1
SO
SR+
M7215
SR
C7400
OUTDOOR
AIR
ENTHALPY
SENSOR
+
S
W7212
4
5
620 OHM
RESISTOR
L1
(HOT)
L2
EXHAUST
FAN
Y1
C
Y2
Y1
COOL 1
W2
Y2
COOL 2
W2
HEAT 2
W1
HEAT 1
W1
AUX
3
A2
G
RH
G
FAN
RC
R
X
HVAC EQUIPMENT
TERMINAL STRIP
T7350
THERMOSTAT
2
L2
1
L1
(HOT)
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
ENSURE THAT TRANSFORMER IS SIZED TO HANDLE THE EXTRA LOAD OF THE ECONOMIZER AND ACTUATOR.
THE SAME TRANSFORMER CAN BE USED FOR THE THERMOSTAT AND ACTUATOR.
3
IF SEPARATE HEATING AND COOLING TRANSFORMERS ARE USED, REMOVE JUMPER AT THERMOSTAT.
T7350 - TERMINAL “AUX” IS POWERED BY THE HEATING TRANSFORMER (RH).
IF POWERING THE ECONOMIZER TERMINAL “N” WITH THE THERMOSTAT TERMINAL “AUX”, BE SURE THE ECONOMIZER IS POWERED BY THE
SAME TRANSFORMER AS TERMINAL “AUX”. IF NOT, USE AN ISOLATION RELAY TO POWER “N”.
4
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD NOT BE REMOVED. DIFFERENTIAL ENTHALPY NOT RECOMMENDED FOR USE
WITH SINGLE-STAGE COOLING SYSTEMS OR SINGLE-STAGE COOLING THERMOSTATS.
5
EF AND EF1 ARE DRY CONTACTS IN THE LOGIC MODULE.
M13657
Fig. 32. W7212 used with M7215 Damper Motor and T7350 Thermostat.
25
63-2484—03
SOLID STATE ECONOMIZER SYSTEM
TR
TR1
24
Vac
HOT
24 Vac
COM
N1
N
MINIMUM POSITION
ADJUSTMENT
P1
C7150B MIXED
AIR OR C7046A
DISCHARGE
AIR SENSOR
P
24 VAC HOT
T1
+
–
T
–
AQ1
+
SO+
2-10 VDC CONTROL
SIGNAL INPUT
1
0/2-10 VDC
INDOOR AIR
SENSOR
24 VAC COM
2
5
AQ
3
4
EF
EF1
SO
SR+
M7215
SR
C7400
OUTDOOR
AIR
ENTHALPY
SENSOR
+
S
W7212
4
5
620 OHM
RESISTOR
L1
(HOT)
L2
EXHAUST
FAN
Y1
C
Y2
Y1
COOL 1
W2
Y2
COOL 2
W2
HEAT 2
W1
HEAT 1
W1
A
3
A
G
R
G
FAN
RC
R
X
HVAC EQUIPMENT
TERMINAL STRIP
TB7220 OR TB8220
THERMOSTAT
1
L1
(HOT)
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
ENSURE THAT TRANSFORMER IS SIZED TO HANDLE THE EXTRA LOAD OF THE ECONOMIZER AND ACTUATOR.
THE SAME TRANSFORMER CAN BE USED FOR THE THERMOSTAT AND ACTUATOR.
3
IF SEPARATE HEATING AND COOLING TRANSFORMERS ARE USED, REMOVE JUMPER AT THERMOSTAT.
TB7220 - TERMINAL “A” IS POWERED BY THE COOLING TRANSFORMER (RC).
TB8220 - TERMINAL “A” IS POWERED BY THE HEATING TRANSFORMER (R).
IF POWERING THE ECONOMIZER TERMINAL “N” WITH THE THERMOSTAT TERMINAL “A”, BE SURE THE ECONOMIZER IS POWERED BY THE
SAME TRANSFORMER AS TERMINAL “A”. IF NOT, USE AN ISOLATION RELAY TO POWER “N”.
4
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD NOT BE REMOVED. DIFFERENTIAL ENTHALPY NOT RECOMMENDED FOR USE
WITH SINGLE-STAGE COOLING SYSTEMS OR SINGLE-STAGE COOLING THERMOSTATS.
M13658
5 EF AND EF1 ARE DRY CONTACTS IN THE LOGIC MODULE.
Fig. 33. W7212 used with M7215 Damper Motor and TB7220 or TB8220 Thermostats.
63-2484—03
2
L2
26
SOLID STATE ECONOMIZER SYSTEM
~
3
4
F
TR1
24
Vac
HOT
24 Vac
COM
N
2
+
TR
N1
1
5
MINIMUM POSITION
ADJUSTMENT
P1
C7150B MIXED
AIR OR C7046A
DISCHARGE
AIR SENSOR
P
T1
+
1
0/2-10 VDC
INDOOR AIR
SENSOR
MS7XXX
HONEYWELL
ACTUATOR
–
T
AQ1
–
2
5
AQ
+
SO+
3
4
EF
EF1
SO
SR+
SR
C7400
OUTDOOR
AIR
ENTHALPY
SENSOR
+
4
W7212
3
620 OHM
RESISTOR
S
C
L1
(HOT)
L2
COOL 1
Y1
Y1
EXHAUST
FAN
Y2
5
W2
W1
W2
HEAT 2
W1
HEAT 1
FAN
DELAY
RELAY
G
RH
UNOCCUPIED
ST6008
TIMER
6
OCCUPIED
FDR
FAN
G
RC
FDR
R
X
HVAC EQUIPMENT
TERMINAL STRIP
THERMOSTAT
2
L2
1
L1
(HOT)
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
ENSURE THAT TRANSFORMER IS SIZED TO HANDLE THE EXTRA LOAD OF THE ECONOMIZER AND ACTUATOR.
3
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD NOT BE REMOVED. DIFFERENTIAL ENTHALPY NOT RECOMMENDED FOR USE
WITH SINGLE-STAGE COOLING SYSTEMS OR SINGLE-STAGE COOLING THERMOSTATS.
4
EF AND EF1 ARE DRY CONTACTS IN THE LOGIC MODULE.
5
SEE WIRING DIAGRAMS FOR T7350 AND TB7220/TB8220.
6
TIME CLOCK IS AN OPTION TO USING OCCUPIED CONTACTS ON THE THERMOSTAT.
M24219
Fig. 34. W7212 used in single-stage cooling system with single enthalpy changeover and Honeywell actuator and time
clock for occupancy.
27
63-2484—03
SOLID STATE ECONOMIZER SYSTEM
TR
TR1
24
Vac
HOT
24 Vac
COM
N1
~
N
1
2
+
3
4
F
5
MINIMUM POSITION
ADJUSTMENT
P1
C7150B MIXED
AIR OR C7046A
DISCHARGE
AIR SENSOR
P
T1
+
1S
0/2-10 VDC
INDOOR AIR
SENSOR
MS7XXX
HONEYWELL
ACTUATOR
–
T
–
AQ1
+
SO+
3
1K
1
2K
2
5
AQ
3
4
EF
EF1
1S1
SO
SR+
SR
C7400
OUTDOOR
AIR
ENTHALPY
SENSOR
+
W7212
5
7
620 OHM
RESISTOR
S
C
Y1
COOL 1
Y2
COOL 2
W2
W2
HEAT 2
W1
W1
HEAT 1
Y1
W
Y2
R
T6031 AMBIENT
LOCKOUT
CONTROL
50 F SETPOINT
8
RH
RC
FAN
FDR
R
X
HVAC EQUIPMENT
TERMINAL STRIP
T7300 OR T874
THERMOSTAT
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
ENSURE THAT TRANSFORMER IS SIZED TO HANDLE THE EXTRA
LOAD OF THE ECONOMIZER AND ACTUATOR.
3
1S IS AN ELECTRONIC SWITCH THAT CLOSES WHEN POWERED
BY A 24 VAC INPUT.
4
FOR T7300 ONLY
5
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD BE
REMOVED ONLY WHEN A C7400 ENTHALPY SENSOR IS ADDED TO
SR AND SR+ FOR DIFFERENTIAL ENTHALPY.
UNOCCUPIED
6
ST6008
TIMER
9
OCCUPIED
FDR
G
1
EXHAUST
FAN
FAN
DELAY
RELAY
G
4
L1
(HOT)
L2
6
2
L2
1
L1
(HOT)
USE THE FOLLOWING CONTACTS INSTEAD OF TIMER
FOR T7300, USE A1 AND A2 TERMINALS.
FOR T7350 USE AUX TERMINAL.
FOR TB7220 OR TB8220 USE A TERMINAL
THE TERMINALS ARE CONNECTED WHEN THERMOSTAT IS IN THE OCCUPIED MODE.
7 EF AND EF1 ARE DRY CONTACTS IN THE LOGIC MODULE.
8 SEE WIRING DIAGRAMS FOR T7350 AND TB7220/TB8220.
9 TIME CLOCK IS AN OPTION TO USING OCCUPIED CONTACTS ON THE THERMOSTAT.
M24220
Fig. 35. W7212 used in two-stage cooling system with Honeywell Series 72 Actuator and time clock for occupancy.
63-2484—03
28
SOLID STATE ECONOMIZER SYSTEM
1
L2
2
L1
(HOT)
~
1
2
+
N1
3
F
5
C7150B MIXED
AIR OR C7046A
DISCHARGE
AIR SENSOR
0/2-10 VDC
INDOOR AIR
SENSOR
3
T1
+
–
2
5
AQ
+
SO+
3
4
EF
EF1
SO
SR+
SR
W7212
4
1
24 Vac
COM
AQ1
–
MS7XXX
HONEYWELL
ACTUATOR
L1
(HOT)
24
Vac
HOT
T
5
UNOCCUPIED
3
ST6008
7
TIMER
TR1
1
4
F
P
1
2
+
MINIMUM POSITION
ADJUSTMENT
P1
MS7XXX
HONEYWELL
ACTUATOR
~
TR
N
4
C7400
OUTDOOR
AIR
ENTHALPY
SENSOR
+
620 OHM
RESISTOR
5
S
OCCUPIED
L2
C
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
2
ENSURE THAT TRANSFORMER IS SIZED TO HANDLE
THE LOAD OF ALL ACTUATORS.
3
USE THE FOLLOWING CONTACTS INSTEAD OF TIMER
FOR T7300, USE A1 AND A2 TERMINALS.
FOR T7350 USE AUX TERMINAL.
FOR TB7220 OR TB8220 USE A TERMINAL
THE TERMINALS ARE CONNECTED WHEN THERMOSTAT
IS IN THE OCCUPIED MODE.
4
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR
SHOULD BE REMOVED ONLY WHEN A C7400 ENTHALPY
SENSOR IS ADDED TO SR AND SR+ FOR DIFFERENTIAL
ENTHALPY.
Y1
Y1
COOL 1
Y2
Y2
COOL 2
W2
W2
HEAT 2
W1
W1
HEAT 1
RH
FDR
FAN
G
FDR
X
R
THERMOSTAT
HVAC EQUIPMENT
TERMINAL STRIP
5
EF AND EF1 ARE DRY CONTACTS IN THE
LOGIC MODULE.
6
SEE WIRING DIAGRAMS FOR T7350
AND TB7220/TB8220.
7
TIME CLOCK IS AN OPTION TO USING OCCUPIED CONTACTS
ON THE THERMOSTAT.
6
EXHAUST
FAN
FAN
DELAY
RELAY
G
RC
L1
(HOT)
L2
L2
1
L1
(HOT)
M24221
Fig. 36. W7212 controlling parallel-wired Honeywell Series 72 Actuators and time clock for occupancy.
29
63-2484—03
SOLID STATE ECONOMIZER SYSTEM
~
1
2
+
5
3
O
4
F
TR
TR1
24
Vac
HOT
24 Vac
COM
N
MINIMUM POSITION
ADJUSTMENT
P1
5
P
T1
C7150B
DISCHARGE
AIR SENSOR
MS7XXX
HONEYWELL
ACTUATOR
0/2-10 VDC
INDOOR AIR
SENSOR
+
–
T
1
2
AQ1
–
4
AQ
+
SO+
3
5
EF
EF1
SO
SR+
SR
W7214
3
C7400
OUTDOOR
AIR
ENTHALPY
SENSOR
2
620 OHM
RESISTOR
+
S
A3
4
C
A2
Y1
Y1
COOL 1
Y2
Y2
COOL 2
W2
W2
HEAT 2
W1
W1
HEAT 1
G
G
FAN
RH
L1
(HOT)
L2
EXHAUST
FAN
L2
R
RC
1
L1
(HOT)
X
O
T7300
THERMOSTAT
5
O
HVAC EQUIPMENT
TERMINAL STRIP
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
EF AND EF1 ARE DRY CONTACTS IN THE LOGIC MODULE.
3
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD BE REMOVED ONLY WHEN A
C7400 ENTHALPY SENSOR IS ADDED TO SR AND SR+ FOR DIFFERENTIAL ENTHALPY.
4
T7300 TERMINALS A2 AND A3 ARE CONNECTED WHEN THERMOSTAT IS IN THE UNOCCUPIED MODE.
SEE WIRING DIAGRAMS FOR T7350 AND TB7220/TB8220.
5
W7213: B TERMINAL
W7214: O TERMINAL
M24222
Fig. 37. W7213, W7214 controlling heat pump system.
63-2484—03
30
SOLID STATE ECONOMIZER SYSTEM
Table 6. Troubleshooting modulating economizer—outdoor enthalpy above setpoint.
Condition on Logic Module Should Be
1. Red LED not lighted.
Condition Not Met
1. If the LED glows, the Logic Module recognizes conditions are good for free cooling. Verify that conditions are above the enthalpy setpoint, see Note 2. Check wiring to Enthalpy Control for a short from {SO} and {+}.
2. 24 Vac to terminals {TR} and {TR1}.
2. Check the wiring from [G] and [C] on the unit low voltage terminal strip. {TR} and
{TR1} power the actuator.
3. 24 Vac to terminals {1} and {TR1}.
3. Verify that there is a call for cooling from the thermostat. Without a call for cooling,
the compressor can not be in the normal air conditioning mode.
4. 24 Vac to terminals {2} and {TR1}.
4. If 24 Vac is not on {2} and {TR1}, the internal switch is not set correctly. Remove
the {SO} wire from the module. If 24 Vac is on {2} and {TR1}, the enthalpy control
is bad or the {SO} and {+} wires are shorted together. If no voltage to {2} and
{TR1}, the module is bad.
5. Continuity on terminals {1} and {2}, {3} 5. If there is not continuity for terminals {1} and {2}, the internal switch is not in the
and {4}.
correct position and the module is defective. If there is continuity from terminals
{1} and {2}, the red LED should not be lighted. If there is continuity on terminals
{3} and {4}, the internal switch is correctly energized. The damper actuator should
be in a min. position.
6. Compressor does not operate with all 6. Check the wiring from {2} to Y1 on the unit low voltage control board. If the LED is
above conditions correct.
not lighted, check 24 Vac from {2} to Y1.
Second Stage
7. 24 Vac to terminals {3} and {TR1}.
7. Verify that you have a two-stage thermostat. Check for a call for a second stage
cooling. If 24 Vac is not on {3} and {TR1}, check wiring from Y2 on the thermostat
to the module.
8. 24 Vac to terminals {4} and {TR1}.
8. If {4} and {TR1} do not have 24 Vac, and {3} and {TR1} have 24 Vac, the internal
switch is not in the correct position. The module is defective.
9. Compressor does not operate with
9. If all other functions are correct, check wiring from {4} to Y2 on the unit low voltage
second stage conditions met.
terminal board.
Table 7. Troubleshooting modulating economizer—outdoor enthalpy below setpoint.
Condition on Logic Module Should Be
Conditions Not Met
1. Red LED lighted.
1. Jumper terminals {SO} and {+}. If the LED lights, the module is okay, see Note 2.
Check wiring to enthalpy control.
2. 24 Vac to terminals {TR} and {TR1}.
2. Check the wiring from [G] and [C] on the unit low voltage terminal strip. {TR} and
{TR1} power the actuator.
3. 24 Vac to terminals {1} and {TR1}.
3. Verify there is a call for cooling from the thermostat. Without a call for cooling, the
motor can not be in the economizer mode.
4. No continuity on terminals {1} and {2}. 4. If there is continuity from terminals {1} and {2}, the red LED should not be lighted. If
there is continuity and the LED glows, the module is defective.
5. Continuity on terminals {3} and {5}.
5. If there is continuity on terminals {3} and {5}, the internal switch is correctly energized. Damper motor should be in a modulating mode.
6. Motor does not operate with all above 6. Jumper the mixed air sensor terminals {T} and {T1}. If the motor begins to operate,
conditions met.
check the wiring to the sensor. If correct, the temperature is below the sensor setpoint or it is defective. If the motor does not operate, and the wiring is correct and
the temperature is above the sensor setpoint, the motor is bad.
Second Stage
7. 24 Vac to terminals {3} and {TR1}.
7. Verify that you have a two-stage thermostat. Check for a call for a second stage
cooling. If 24 Vac is not on terminals {3} and {TR1}, check wiring from terminal Y2
on the thermostat to the module.
8. 24 Vac to terminals {5} and {TR1}.
8. If terminals {5} and {TR1} do not have 24 Vac, the internal switch is not in the correct position, assuming that terminals {3} and {TR1} have 24 Vac. The module is
defective.
9. Compressor does not operate with
second stage conditions met.
9. If all other functions are correct, check the wiring from terminal {5} to Y2 on the unit
low voltage terminal board.
31
63-2484—03
SOLID STATE ECONOMIZER SYSTEM
Table 8. Troubleshooting three-position economizer—outdoor enthalpy above setpoint.
Condition on Logic Module Should Be
Conditions Not Met
1. Red LED not lighted.
1. If the LED glows, the module is in the economizer mode. Verify the conditions are
above the enthalpy setpoint, see Note 2. Check wiring to Enthalpy Control for a
short from {SO} and {+}.
2. 24 Vac to terminals {TR} and {TR1},
{X} and {TR}.
2. Check the wiring from [G] and [C] on the unit low voltage terminal strip. {TR} and
{TR1} power the actuator. {X} and {TR} provide power for minimum position.
3. 24 Vac to terminals {1} and {TR}.
3. Verify that there is a call for cooling from the thermostat. Without a call for cooling
the compressor can not be in the normal air conditioning mode.
4. 24 Vac to terminals {2} and {TR}.
4. If 24 Vac is not on {2} and {TR}, the internal contacts are not set correctly. Remove
the {SO} wire from the module. If 24 Vac is on {2} and {TR}, the enthalpy control is
bad or the {SO} and + wiring are shorted together. If no voltage to {2} and {TR}, the
module is bad.
5. Continuity on terminals {1} and {2}, {3} 5. If there is not continuity for {1} to {2}, the internal contacts are not in the correct
and {4}.
position, and either the module or the enthalpy control is defective. If there is continuity from terminals {1} and {2}, the red LED should not be lighted. If there is continuity and the LED glows, the module is defective. If there is continuity on terminals
{3} and {4}, the internal contacts are correctly energized. Damper motor should be
in the min. position.
6. Compressor does not operate with all 6. Check the wiring from {2} to Y1 on the unit low voltage control board. Verify that
above conditions correct.
there are not 24 Vac to Y1 and C on the unit.
Second Stage
7. 24 Vac to terminals {3} and {TR}.
7. Verify that the thermostat is two-stage. Check for a call for a second stage cooling.
If there are not 24 Vac on {3} and {TR}, check wiring from Y2 on the thermostat to
the module.
8. 24 Vac to terminals {5} and {TR}.
8. If {5} and {TR} do not have 24 Vac and {3} and {TR} have 24 Vac, the internal
switch 1S is not in the correct position. The module is defective.
9. Compressor does not operate with
second stage conditions met.
9. If all other functions are correct, check the wiring from {5} to Y2 on the unit low voltage terminal board.
Table 9. Troubleshooting three position economizer—outdoor enthalpy below setpoint.
Condition on Logic Module Should Be
Conditions Not Met
1. Red LED lighted.
1. Jumper terminals {SO} and {+}. If the LED glows, the module is okay, see Note 2.
Check wiring to enthalpy control.
2. 24 Vac to terminals {TR} and {TR1}.
2. Check the wiring from [G] and [C] on the unit low voltage terminal strip. {TR} and
{TR1} power the actuator.
3. 24 Vac to terminals {1} and {TR1}.
3. Verify there is a call for cooling from the thermostat. Without a call for cooling, the
motor can not be in the economizer mode.
4. No continuity on terminals {1} and {2}. 4. If there is continuity from terminals {1} and {2}, then the red LED cannot be lighted.
If there is continuity and the LED glows, the module is defective.
5. Continuity on terminals {3} and {5}.
5. If there is continuity on terminals {3} and {5}, the internal switch 1S is correctly
energized. Damper motor should be in a modulating mode.
6. Motor does not operate with all above 6. Jumper the mixed air sensor terminals {6} and {D}. If the motor begins to operate,
conditions met.
check the wiring to the sensor. If it is correct, the temperature is below the sensor
setpoint or the sensor is defective. If the motor does not operate, the wiring is correct, and the temperature is above the sensor setpoint, the motor is bad.
Second Stage
7. 24 Vac to terminals {3} and {TR}.
7. Verify that the thermostat is two-stage. Check for a call for a second stage cooling.
If 24 Vac is not on {3} and {TR}, check wiring from Y2 on the thermostat to the module.
8. 24 Vac to terminals {5} and {TR}.
8. If {5} and {TR} do not have 24 Vac, and {3} and {TR} do have 24 Vac, then the internal switch 1S is not in the correct position. The module is defective.
9. Compressor does not operate with
second stage conditions met.
9. If all other functions are correct, check the wiring from {5} to Y2 on the unit low voltage terminal board.
63-2484—03
32
SOLID STATE ECONOMIZER SYSTEM
CHECKOUT AND
TROUBLESHOOTING: W7212
W7212
EXH
N1
N
Checkout requires a 9V battery, 620 ohm, 1.2K ohm, 5.6K
ohm, and 6.8K ohm resistors. Use Table 10 and Fig. 38 for
checkout.
2V
Set
10V
EXH
P1
P
Min
Pos
T1
1
DC VOLTMETER
CAUTION
T
DCV
+
Equipment Damage Hazard.
Excessive force can damage potentiometer
controls.
Use a small screwdriver when adjusting enthalpy
changeover and minimum damper position controls.
2V
AQ1
–
C7400
Open
DCV
AQ
SO+
S
SO
+
SR+
SR
Max
10V
DCV
2V
Set
10V
Free
Cool
B
C
A
D
2
620 OHM RESISTOR
1 INSERT DC VOLTMETER BETWEEN AQ AND AQ1 FOR
CHECKOUT AND TROUBLESHOOTING.
2 JUMPER USED FOR SINGLE ENTHALPY CONTROL.
M20612
Fig. 38. Meter location for checkout and troubleshooting
(W7212 shown).
Table 10. Checkout for W7212, W7213, W7214 Economizers Connected to Honeywell Actuator.
Step
Checkout Procedure
1.
CHECKOUT PREPARATION
Disconnect power at TR and TR1.
Disconnect devices at P and P1.
Jumper P to P1.
Place 5.6K ohm resistor across T and T1.
Jumper TR to 1.
W7212 only: Jumper TR to N.
If connected, remove C7400 Enthalpy Sensor from
terminals SO and +.
Proper Response
All LED are off; Exhaust Fan contacts are open.
Connect 1.2K ohm 4074EJM Checkout Resistor across
terminals SO and +.
Put 620 ohm resistor across SR and +.
2.
3.
Set minimum position, DCV setpoint, and Exhaust
potentiometers fully CCW.
Turn DCV maximum position potentiometer fully CW.
Set enthalpy potentiometer to D.
Apply power (24 Vac) to terminals TR and TR1.
DIFFERENTIAL ENTHALPY
Execute step one, Checkout Preparation.
Place 620 ohm resistor across SO and +.
–
–
Place 1.2K ohm resistor across SR and +.
Free cool LED turns on.
Remove 620 ohm resistor from SO and +.
Free cool LED turns off.
SINGLE ENTHALPY
Execute step one, Checkout Preparation.
Set enthalpy potentiometer to A (fully CCW).
Set enthalpy potentiometer to D (fully CW).
–
Free cool LED turns on.
Free cool LED turns off.
33
63-2484—03
SOLID STATE ECONOMIZER SYSTEM
Table 10. Checkout for W7212, W7213, W7214 Economizers Connected to Honeywell Actuator. (Continued)
Step
4.
Checkout Procedure
Proper Response
DCV AND EXHAUST
Execute step one, Checkout Preparation.
Ensure terminals AQ and AQ1 are open.
–
LED for both DCV and Exhaust should be off.
Actuator drives fully closed.
Connect 9V battery positive to AQ and negative to AQ1.
Turn Exhaust potentiometer CW until Exhaust LED turns
off.
Turn DCV setpoint potentiometer CW.
Turn DCV setpoint potentiometer CCW until Exhaust LED
turns on.
Turn DCV setpoint potentiometer CW.
5.
Turn Exhaust potentiometer CCW until Exhaust LED turns
on.
MINIMUM AND MAXIMUM POSITION
Execute step one, Checkout Preparation.
Connect 9V battery positive to AQ and negative to AQ1.
Turn DCV maximum position potentiometer to midpoint.
Turn DCV maximum position potentiometer to fully CCW.
Turn minimum position potentiometer to midpoint.
Turn minimum position potentiometer fully CW.
6.
7.
W7212: Remove jumper from TR and N.
MIXED AIR INPUT
Execute step one, Checkout Preparation.
Set enthalpy potentiometer to A.
–
DCV LED turns on. Actuator drives to between 81 and 85
degrees open.
Actuator drives to between 18 and 72 degrees open.
Actuator drives fully closed.
Actuator drives to between 18 and 72 degrees open.
Actuator drives fully open.
Actuator drives fully closed.
Remove 5.6K ohm resistor and jumper from T and T1.
Remove jumper from T and T1 and leave open.
HEAT PUMP INPUT - W7213, W7214 ONLY
Execute step one, Checkout Preparation.
Set enthalpy potentiometer to A.
W7213: Jumper TR to B.
W7214: Remove jumper from TR and O.
63-2484—03
LED for both DCV and Exhaust turn on.
Actuator drives to between 81 and 85 degrees open.
Exhaust LED turns off with potentiometer approximately 90
percent CW. Actuator remains in position.
DCV LED turns off with potentiometer at approximately 9V.
Actuator drives fully closed.
Exhaust contacts close 30-90 seconds after Exhaust LED
turns on.
Exhaust LED turns off with potentiometer indication at
approximately 9V.
Exhaust contacts close 30-90 seconds after Exhaust LED
turns on.
34
–
Free cool LED turns on.
Actuator drives to between 18 and 72 degrees open.
Actuator drives fully open.
Actuator drives fully closed.
–
Free cool LED turns on.
Actuator drives to between 18 and 72 degrees open.
Free cool LED turns off.
Actuator drives fully closed
SOLID STATE ECONOMIZER SYSTEM
35
63-2484—03
SOLID STATE ECONOMIZER SYSTEM
By using this Honeywell literature, you agree that Honeywell will have no liability for any damages arising out of your use or modification to,
the literature. You will defend and indemnify Honeywell, its affiliates and subsidiaries, from and against any liability, cost, or damages,
including attorneys’ fees, arising out of, or resulting from, any modification to the literature by you.
Automation and Control Solutions
Honeywell International Inc.
Honeywell Limited-Honeywell LimitГ©e
1985 Douglas Drive North
35 Dynamic Drive
Golden Valley, MN 55422
Toronto, Ontario M1V 4Z9
customer.honeywell.com
В® U.S. Registered Trademark
В© 2008 Honeywell International Inc.
63-2484—03 W.C. Rev. 03-09
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