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Honeywell C7046C Product Data
Honeywell C7046C Product Data

Honeywell C7046C Product Data

Solid state economizer system, consisting of discharge air sensor or mixed air sensor, solid state enthalpy sensor, solid state temperature sensor, damper actuators, thermostat and solid state economizer logic module
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(CONSISTING OF: C7046C DISCHARGE AIR SENSOR OR C7150B MIXED AIR SENSOR,
C7400A SOLID STATE ENTHALPY SENSOR OR C7650A SOLID STATE TEMPERATURE SENSOR,
C7046C
C7150B
C7400A/C7650A
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,
C7150B Mixed Air Sensor, C7400A Solid State Enthalpy
Sensor or C7650A Solid State Temperature Sensor, M7415
and M8405 Damper Actuators, T6031H Thermostat, and
W7459A,C,D Solid State Economizer Logic Module.
® U.S. Registered Trademark
Copyright © 1997 Honeywell Inc. • All Rights Reserved
Solid State Economizer System
M7415 OR M8405 DAMPER ACTUATORS, T6031H THERMOSTAT AND
W7459A,C, OR D SOLID STATE ECONOMIZER LOGIC MODULE)
M7415/M8405
T6031H
W7459A,C,D
FEATURES
C7046C Discharge Air Sensors have probe lengths of 8 in.
(203 mm) and nominal sensor resistance of 3000 ohms at
77 ° F (25 ° C).
• No setting or calibration required.
• Solid state components not affected by dust or dirt.
• Fast reacting.
• Rugged aluminum insertion probe.
C7150B Mixed Air Sensor is used with the M7415/M8405
Damper Actuator to sense mixed or discharged air in rooftop
packaged air conditioning equipment.
• No setting or calibration required.
C7400A Solid State Enthalpy Sensor and C7650A Solid State
Temperature Sensors are used with the W7459 Solid State
Economizer Logic Module to allow using outdoor air as the
first stage of cooling in HVAC systems.
• C7400A senses and combines temperature and
humidity of outdoor air (heat index).
• C7650A senses temperature only.
• Long-lasting, solid state sensing element is accurate
and stable over time.
• 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.
• Provides a 4 to 20 mA output signal to the W7459 Solid
State Economizer Logic Module; setpoint is located on
solid state economizer control.
• Maximum economizer savings is achieved when two
C7400A Solid State Enthalpy Sensors are connected
to one W7459 Solid State Economizer Logic Module
for differential enthalpy changeover control.
Application ........................................................................... 1
Features .............................................................................. 1
Ordering Information ........................................................... 2
Specifications ...................................................................... 3
Installation ........................................................................... 7
Operation and Checkout ..................................................... 13
Settings and Adjustments ................................................... 15
Sequence of Operation ....................................................... 16
Checkout and Troubleshooting ............................................ 17
PRODUCT DATA
(Continued)
Contents
63-2484-1

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Summary of Contents for Honeywell C7046C

  • Page 1: Table Of Contents

    Solid State Economizer System (CONSISTING OF: C7046C DISCHARGE AIR SENSOR OR C7150B MIXED AIR SENSOR, C7400A SOLID STATE ENTHALPY SENSOR OR C7650A SOLID STATE TEMPERATURE SENSOR, M7415 OR M8405 DAMPER ACTUATORS, T6031H THERMOSTAT AND W7459A,C, OR D SOLID STATE ECONOMIZER LOGIC MODULE)
  • Page 2: Ordering Information

    Honeywell, 1885 Douglas Drive North Minneapolis, Minnesota 55422-4386 In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9. International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
  • Page 3: Specifications

    Nominal Sensitivity: 70 ohms per degree F (124 ohms per degree C) at midrange. 1/2 (13) 3/8 (10) DIAMETER DIAMETER (22) 1/4 (6) DIAMETER 3/4 (19) 9/16 IMMERSION LENGTH: 8 (203) (14) 1-1/2 (38) M9087 Fig. 1. Approximate dimensions of C7046C Air Temperature Sensor in in. (mm). 63-2484—1...
  • Page 4 SOLID STATE ECONOMIZER SYSTEM Approval: Actuator Rotation: Underwriters Laboratories Inc. Flammability Rating: Closed position is the limit of clockwise rotation; open position UL94-5V. is the limit of counterclockwise rotation as viewed from the shaft end of the motor. These motors are shipped with the Dimensions: shaft in the closed position.
  • Page 5 SOLID STATE ECONOMIZER SYSTEM Temperature Ratings: T6031H Thermostat -25°F to +125°F (-32°C to +52°·C). A standard spdt switch, without a case, that acts as a changeover thermostat. Approval: Underwriters Laboratories Inc.: Electrical Rating: Flammability Rating: UL94V-5V. 0.25A at 1/.4V to 12 Vdc inductive load. Specifications: Control Range, Element Temperature and Differential: See Table 3.
  • Page 6: Installation

    8 sheet metal screws (not provided). 1. Read these instructions carefully. Failure to follow them To mount the C7046C Sensor in a junction box (see Fig. 8): could damage the product or cause a hazardous Cut a 1/2 in (13 mm) hole in the duct or plenum surface condition.
  • Page 7 SENSOR WIRES WITH 2 SOLDERLESS CONNECTORS SCREWS NOT PROVIDED. SYSTEM DUCT OR PLENUM M9088 Fig. 8. Mounting C7046C Discharge Air Temperature Sensor in junction box. Wiring CAUTION IMPORTANT Failure to follow these wiring practices can introduce CAN CAUSE ELECTRICAL SHOCK OR electrical interference (noise) that can cause erratic EQUIPMENT DAMAGE.
  • Page 8 SOLID STATE ECONOMIZER SYSTEM Location and Mounting Disconnect power supply before connecting wiring to prevent electrical shock or equipment damage. All wiring must comply Location with applicable local codes and ordinances. See Fig. 10 and Locate the actuator as close as possible to the equipment to 13 for typical hookup diagrams.
  • Page 9 SOLID STATE ECONOMIZER SYSTEM W7459C ECONOMIZER PACKAGE M8405 ACTUATOR M8405 APPLY 24VAC T-X FOR MIN POSN T-D FOR OUTDOOR MAX POSN SENSOR C7400 RETURN SENSOR C7400 UNOCCUPIED S6005 TIMER OCCUPIED T675/T6031 MIXED AIR CONTROL 55° F SETPOINT COOL 1 T6031 AMBIENT COOL 2 LOCKOUT CONTROL 50°...
  • Page 10 SOLID STATE ECONOMIZER SYSTEM M7415, M7405 OR M8405 ACTUATOR TEMPERATURE RISE SETPOINT BREAKS R-B; MAKES R-W ON RISE SWITCH DIFFERENTIAL SETPOINT FOR T6031H MAKES R-B; BREAKS R-W ON FALL W7459 ECONOMIZER PACKAGE M9091 R AND W LOCATIONS DEPEND ON MODEL Fig.
  • Page 11 SOLID STATE ECONOMIZER SYSTEM W7459A ECONOMIZER PACKAGE M7415 ACTUATOR 24 VAC OUTDOOR ENTHALPY SENSOR C7400 620 OHM RESISTOR MIXED SENSOR C7150B MIXED AIR OR C7046A MINIMUM POSITION MINIMUM UNOCCUPIED DISCHARGE ADJUSTMENT POSITION S6005 AIR SENSOR TIMER OCCUPIED M7415 COOL 1 24 VAC T6031 AMBIENT LOCKOUT...
  • Page 12: Operation And Checkout

    C7046C and C7150B Mixed/Discharge Air Sensors for cooling. The C7046C and C7150B Mixed Air Sensors consist of a thermistor sensing element mounted in a tubular probe. The If outdoor air enthalpy is higher than return air enthalpy, the sensors are applied at various locations throughout single outdoor air damper closes to minimum position.
  • Page 13 SOLID STATE ECONOMIZER SYSTEM (29) (32) (35) (38) (41) (43) CONTROL CONTROL POINT CURVE APPROX. °F (°C) AT 50% RH (27) 73 (23) 70 (21) 67 (19) 63 (17) (24) (21) (18) (16) (13) (10) (10) (13) (16) (18) (21) (24) (27) (29)
  • Page 14: Settings And Adjustments

    SOLID STATE ECONOMIZER SYSTEM Sensor. It responds to both dry bulb temperature and M7415 Damper Actuator humidity, allowing the use of outdoor air at higher Single M7415 Damper Actuator accepts thermistor sensor temperatures for free cooling when the humidity is low. input from a C7046A or a C7150B Mixed Air Sensor mounted in discharge or mixed air duct.
  • Page 15: Sequence Of Operation

    SOLID STATE ECONOMIZER SYSTEM W7459C Economizer Logic Module Discharge Air Temperature Setpoint Connect 24 Vac at terminals TR and X (D is not Adjustment—M7415 Only connected). Adjust thumbwheel on motor for desired minimum This temperature range can be adjusted either up or down by position.
  • Page 16: Checkout And Troubleshooting

    SOLID STATE ECONOMIZER SYSTEM If the logic module senses that the outside air is On the standard economizers, the damper motor not suitable for cooling, the air conditioning unit is energized if the outside air temperature is compressor is energized and the space is cooled below the enthalpy setpoint, thereby opening the with refrigerated air.
  • Page 17 SOLID STATE ECONOMIZER SYSTEM ENTHALPY ENTHALPY CHANGEOVER W7459 CHANGEOVER SETPOINT SETPOINT C7400 620 OHM MILLIAMMETER JUMPER MINIMUM DAMPER POSITION SETTING LED LIGHTS WHEN OUTDOOR AIR IS SUITABLE LED LIGHTS FOR FREE COOLING WHEN OUTDOOR AIR IS SUITABLE FOR FREE COOLING INSERT DC MILLIAMMETER BETWEEN S O AND S FOR CHECKOUT AND TROUBLESHOOTING.
  • Page 18 SOLID STATE ECONOMIZER SYSTEM Table 7. Troubleshooting modulating economizer—outdoor enthalpy below setpoint. Condition on Logic Module Should Be Conditions Not Met Red LED lighted. Jumper terminals {SO} and {+}. If the LED lights, the module is okay, see Note 2. Check wiring to enthalpy control. 24 Vac to terminals {TR} and {TR1}.
  • Page 19 SOLID STATE ECONOMIZER SYSTEM Table 8. Troubleshooting three-position economizer—outdoor enthalpy above setpoint. Condition on Logic Module Should Be Conditions Not Met Red LED not lighted. If the LED glows, the module thinks it 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 {+}.
  • Page 20 Closed position is either the minimum position or fully closed, depending on the job setting. Opening/closing is dependent on the mixed air temperature. Home and Building Control Home and Building Control Honeywell Asia Pacific Inc. Honeywell Inc. Honeywell Limited-Honeywell Limitée Room 3213-3225...