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SYSTEM ENGINEERING GUIDE

63-2484—03

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

 MODU-

LATING DIRECT COUPLED ACTUATORS (MS7503 or MS7505) T6031H THERMOSTAT AND W7459 

OR

 W7212 SOLID 

STATE ECONOMIZER LOGIC MODULE)

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.

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 W7212/W7459 

Economizer Module to sense mixed or discharged air in roof-

top packaged air conditioning equipment.

• 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.

• 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.

 

C7150B

M7215/M7415/

M8405

C7046C

W7459A,C

C7400A/C7660

W7212A,C

T6031H

Содержание C7046C

Страница 1: ...EATURES 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 W7212 W7459 Economizer Module to sense mixed or discharged air in roof top packaged air conditionin...

Страница 2: ...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 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...

Страница 3: ...ient Temperature 250 F 121 C Operating Temperature Range 40 F to 150 F 4 C to 66 C Wiring Connections 6 in 152 mm leadwires Dimensions See Fig 1 C7150B Mixed Air Sensor Used to sense mixed air in rooftop packaged air conditioning equipment Resistance Temperature NTC Nominal Resistance 3000 ohms at 77 F 24 C Nominal Sensitivity 70 ohms per degree F 124 ohms per degree C at midrange Maximum Ambient ...

Страница 4: ...s Inc Component Recognized File No E4436 Guide No XAPX2 Vol 9 Section 1 7 25 83 SPECIFICATIONS M7215 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 Dimensions See Fig 4 Electrical Ratings Supply Voltage 24 6 Vac 50 60 Hz Power Consumption 24 Vac 60 Hz 8 7 VA 24 Vac 50 Hz 8 4 VA Torque Lift and Hold 25 lb in...

Страница 5: ...over thermostat Electrical Rating 0 25A at 1 4V to 12 Vdc inductive load Control Range Element Temperature and Differential See Table 2 Approval Underwriters Laboratories Inc Listed File E4436 Vol 4 Guide No XAPX2 Dimensions See Fig 5 Table 1 M7415A M7405A Actuator Specifications Power Vac Torque Model Number Voltage Vac 50 60 Hz Drive Hold Timing sec a Stroke lb in Nm Open Rotation Shaft End View...

Страница 6: ...mate dimensions of W7459 Solid State Economizer Logic Module in in mm SPECIFICATIONS W7212A C LOGIC MODULE Models W7212A W7213A W7214A Logic Modules for use with any Honeywell 2 10 Vdc actuator includes DCV input adjustable exhaust fan setpoint NOTES All models include a minimum damper position potentiometer and setpoints for occupied unoc cupied control DCV operation and DCV maxi mum Occupied Uno...

Страница 7: ...nsor 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 Fig 7 Logic module dimensions in in mm 1 The W7212A has A B C and D settings that correspond to the lines...

Страница 8: ...e Fig 8 3 Reposition the crank arm to accommodate specific damper requirements NOTE Crank arm position is adjustable in eight degree increments 4 Reconnect crank arm to the motor hub 5 If there is an excess length of linkage rod cut it to size Make necessary minor adjustments until desired opera tion is obtained 6 Tighten all nuts and set screws Fig 8 Limits of crank arm rotation WIRING M7215 All ...

Страница 9: ...ockout 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 Fig 10 Mounting C7046C Air Temperature Sensor on duct or plenum Fig 11 Mounting C7046C Discharge Air Temperature Sensor in junction box Wiring CAUTION Can Cause Electrical Shock or Equipment Damage Disconnect the power...

Страница 10: ...ments 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...

Страница 11: ...or is mounted See Fig 14 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 CAUTION Equipment Dam...

Страница 12: ...r control and damper actuator to proportion an outdoor air damper in a ventilation system 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 Figure 19 is a partial psychrometric chart with single C7400C sensor and W7212C econom...

Страница 13: ... in Fig 21 Fig 18 Partial psychrometric chart with single C7400A Solid State Enthalpy Sensor and W7212A or W7459 Solid State Economizer Logic Module performance curves CONTROL CURVE A B C D CONTROL POINT APPROX F C AT 50 RH 73 23 70 21 67 19 63 17 1 2 1 4 1 6 1 8 2 0 2 2 2 4 2 6 2 8 3 0 3 2 3 4 3 6 3 8 4 0 4 2 4 4 4 6 9 0 1 0 0 8 0 7 0 6 0 5 0 4 0 3 0 20 10 E N T H A L P Y B T U P E R P O U N D D ...

Страница 14: ... 85 29 90 32 95 35 100 38 105 41 110 43 35 2 35 2 40 4 40 4 105 41 110 43 45 7 45 7 50 10 50 10 55 13 55 13 60 16 60 16 65 18 65 18 70 21 70 21 75 24 75 24 80 27 80 27 85 29 90 32 95 35 100 38 APPROXIMATE DRY BULB TEMPERATURE F C A A B B C C D D M23879A R E L A T I V E H U M I D I T Y 1 1 HIGH LIMIT CURVE FOR W7210D W7212 W7213 W7214 W7340C E E 20 10 30 40 50 60 70 80 90 100 60 50 40 70 80 90 100 ...

Страница 15: ...ing returns to minimum position W7459A C Solid State Economizer Logic Module 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 res...

Страница 16: ...ature 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 Fig 23 Increasing C7150B setpoint Fig 24 Decreasing C7150B setpoint W7459A C Solid State Economizer Logic Module Two potentiome...

Страница 17: ...ing 2 The W7459 Solid State Economizer Logic Module begins to make decisions regarding the unit economizer operation 3 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 ...

Страница 18: ...sor 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 C74...

Страница 19: ...above No power to O heating mode free cool disabled Actuator drives to minimum position closed when Unoccupied SETTINGS AND ADJUSTMENTS W7212 CAUTION Equipment Damage Hazard Excessive force can damage potentiometer controls Use a small screwdriver when adjusting enthalpy changeover and minimum damper position controls Potentiometers with small screwdriver adjustment slots located on device face pr...

Страница 20: ...mount of outdoor air for building efflu ents as required by local codes to enter the build ing This procedure requires use of a quality thermometer capable of reading to 0 5 F 0 25 C NOTE Make minimum position adjustments with at least a 10 F 6 C temperature difference between outdoor and return air 1 Calculate the appropriate mixed air temperature See Equation 1 Formula to aid minimum position ad...

Страница 21: ...to return air NOTE Turn the enthalpy setpoint potentiometer fully clock wise 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 ...

Страница 22: ...F THE ECONOMIZER AND ACTUATOR RELAYS 1K AND 2K ACTUATE WHEN THE ENTHALPY SENSED BY THE C7400 IS HIGHER THAN THE ENTHALPY SETPOINT A D 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 FOR T7300 ONLY TR1 IS HOT ON W7459C TR1 IS GROUND ON ALL OTHER MODELS OF W7459 M3865C T7300 OR T874 THERMOSTAT X D D 6 X 1 3 4 ...

Страница 23: ...ENSED BY THE C7400 IS HIGHER THAN THE ENTHALPY SETPOINT A D 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 FOR T7300 ONLY WITH T7300 USE CONTACTS A1 AND A2 INSTEAD OF S7005 TIMER M10115A T7300 OR T874 THERMOSTAT T1 P1 P1 P T1 1 3 4 2 5 2K S 1 1 2 3 4 6 TR TR1 SO SR TR M7415 ACTUATOR W7459A ECONOMIZER PACKAG...

Страница 24: ...MS OR SINGLE STAGE COOLING THERMOSTATS T7300 TERMINALS A1 AND A2 ARE CONNECTED WHEN THERMOSTAT IS IN THE OCCUPIED MODE EF AND EF1 ARE DRY CONTACTS IN THE LOGIC MODULE M20716D S 1 2 3 2 4 5 5 C7400 OUTDOOR AIR ENTHALPY SENSOR L1 HOT L2 FAN HEAT 1 HEAT 2 COOL 1 HVAC EQUIPMENT TERMINAL STRIP T7300 Q7300 THERMOSTAT 1 C G W1 A2 A1 Y1 Y2 R W2 RC RH G X W1 Y1 Y2 W2 A1 A2 COOL 2 N1 P1 T1 SR SO AQ EF1 EXHA...

Страница 25: ...SAME TRANSFORMER AS TERMINAL AUX IF NOT USE AN ISOLATION RELAY TO POWER N 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 EF AND EF1 ARE DRY CONTACTS IN THE LOGIC MODULE M13657 S 1 2 3 2 4 5 C7400 OUTDOOR AIR ENTHALPY SENSOR L1 HOT L2 FAN HEAT 1 HEAT 2 COOL 1 HVAC E...

Страница 26: ...E ECONOMIZER IS POWERED BY THE SAME TRANSFORMER AS TERMINAL A IF NOT USE AN ISOLATION RELAY TO POWER N 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 EF AND EF1 ARE DRY CONTACTS IN THE LOGIC MODULE M13658 S 1 2 3 2 4 5 C7400 OUTDOOR AIR ENTHALPY SENSOR L1 HOT L2 FA...

Страница 27: ... STAGE COOLING THERMOSTATS EF AND EF1 ARE DRY CONTACTS IN THE LOGIC MODULE SEE WIRING DIAGRAMS FOR T7350 AND TB7220 TB8220 TIME CLOCK IS AN OPTION TO USING OCCUPIED CONTACTS ON THE THERMOSTAT M24219 S 1 2 3 2 4 5 4 C7400 OUTDOOR AIR ENTHALPY SENSOR UNOCCUPIED ST6008 TIMER L1 HOT L2 FDR FDR FAN HEAT 1 HEAT 2 COOL 1 HVAC EQUIPMENT TERMINAL STRIP THERMOSTAT 1 C G W1 Y1 R W2 RC RH G X W1 Y1 Y2 W2 OCCU...

Страница 28: ...UX TERMINAL FOR TB7220 OR TB8220 USE A TERMINAL THE TERMINALS ARE CONNECTED WHEN THERMOSTAT IS IN THE OCCUPIED MODE EF AND EF1 ARE DRY CONTACTS IN THE LOGIC MODULE SEE WIRING DIAGRAMS FOR T7350 AND TB7220 TB8220 TIME CLOCK IS AN OPTION TO USING OCCUPIED CONTACTS ON THE THERMOSTAT UNOCCUPIED ST6008 TIMER L1 HOT L2 FDR FDR FAN HEAT 1 HEAT 2 COOL 1 HVAC EQUIPMENT TERMINAL STRIP T7300 OR T874 THERMOST...

Страница 29: ...IS ADDED TO SR AND SR FOR DIFFERENTIAL ENTHALPY EF AND EF1 ARE DRY CONTACTS IN THE LOGIC MODULE SEE WIRING DIAGRAMS FOR T7350 AND TB7220 TB8220 TIME CLOCK IS AN OPTION TO USING OCCUPIED CONTACTS ON THE THERMOSTAT M24221 1 2 3 4 5 ST6008 TIMER 1 2 L1 HOT L2 L1 HOT L2 L1 HOT L2 FDR FDR FAN HEAT 1 HEAT 2 COOL 1 COOL 2 HVAC EQUIPMENT TERMINAL STRIP THERMOSTAT 1 C G W1 Y1 Y2 R W2 RC G X W1 RH Y1 Y2 W2 ...

Страница 30: ...RE CONNECTED WHEN THERMOSTAT IS IN THE UNOCCUPIED MODE SEE WIRING DIAGRAMS FOR T7350 AND TB7220 TB8220 W7213 B TERMINAL W7214 O TERMINAL M24222 1 2 3 4 5 4 5 5 L1 HOT L2 FAN HEAT 1 HEAT 2 COOL 1 COOL 2 HVAC EQUIPMENT TERMINAL STRIP T7300 THERMOSTAT 1 C G W1 Y1 Y2 R W2 RC G X O O W1 RH Y1 Y2 A3 A2 W2 S C7400 OUTDOOR AIR ENTHALPY SENSOR O P1 T1 SR SO AQ EF1 5 EF 3 4 2 1 TR MINIMUM POSITION ADJUSTMEN...

Страница 31: ...tch 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 wiring from 4 to Y2 on the unit low voltage 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...

Страница 32: ...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 volt age terminal board Table 9 Troubleshooting three position economizer outdoor enthalpy below setpoint Condition on...

Страница 33: ...kout Procedure Proper Response 1 CHECKOUT PREPARATION Disconnect power at TR and TR1 All LED are off Exhaust Fan contacts are open 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 Connect 1 2K ohm 4074EJM Checkout Resistor across terminals SO and Put 620 ohm...

Страница 34: ... 9V battery positive to AQ and negative to AQ1 DCV LED turns on Actuator drives to between 81 and 85 degrees open Turn DCV maximum position potentiometer to midpoint Actuator drives to between 18 and 72 degrees open Turn DCV maximum position potentiometer to fully CCW Actuator drives fully closed Turn minimum position potentiometer to midpoint Actuator drives to between 18 and 72 degrees open Turn...

Страница 35: ...SOLID STATE ECONOMIZER SYSTEM 35 63 2484 03 ...

Страница 36: ...tered Trademark 2008 Honeywell International Inc 63 2484 03 W C Rev 03 09 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 resulti...

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