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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 OR MODULATING DIRECT COUPLED ACTUATORS (MS7505),
T6031H THERMOSTAT AND W7459 OR W7212 SOLID STATE ECONOMIZER LOGIC MODULE)
PRODUCT DATA
FEATURES
C7046C Discharge Air Sensors have probe lengths of 8 in.
C7046C
(203 mm) and nominal sensor resistance of 3000 ohms at
77°F (25°C).
No se
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SOLID STATE ECONOMIZER SYSTEM M7415 and M8405 Damper Actuators are 25 lb-in. spring W7459C mounts on M8405A Damper Actuator and return damper actuators that provide modulating or three- accepts inputs from single pole single throw (spst) position control of economizer systems on HVAC equipment. mixed or discharge air control and C7400 Solid State Enthalpy Sensors. M7415 Damper Actuator provides modulating control Packages are designed to operate from the cooling of economizer dampers
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SOLID STATE ECONOMIZER SYSTEM Mounting Arrangement: MS7505 Spring Return Direct Coupled Actuator Integral mounting flange that requires two no. 8 screws (not The MS7505 Series Spring Return Direct Coupled Actuators provided). (DCA) are control actuators that provide proportioning control for valves and dampers. They accept a voltage signal from an Maximum Ambient Temperature: economizer to position a damper or valve at any chosen point 250°F (121°C). between fully open and fully closed. Ope
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SOLID STATE ECONOMIZER SYSTEM Terminal Connections: 1/4 in. (6 mm) male quick connect terminals mounted on actua- tor. Terminal arrangement is dependent on actuator model. 3/4 Ambient Operating Temperature Range: (19) -40°F to +125°F (-40°C to +52°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. Compone
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SOLID STATE ECONOMIZER SYSTEM Shaft: Single-ended drive shaft with crank arm supplied. Approvals: Underwriters Laboratory Inc.: Flammability Rating: UL94-5V. Reliability: Component Recognized: File No. E4436, Guide No. Full-Stroke Cycles: 60,000. Repositions: 1,500,000. XAPX2, Vol. 9, Section 1, 7-25-83. 4-1/2 (114) 1/4 (6) 1-3/8 (35) 4-1/32 (102) 4-1/2 (114) 4-1/2 3-1/8 (79) (114) 5 (127) 2-1/4 (57) 7/16 3-1/2 (89) 1-1/4 (11) (32) 5-3/16 (132) TOP VIEW SIDE VIEW POWER END
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SOLID STATE ECONOMIZER SYSTEM MOUNTING 1 HOLES 4-1/16 (103) OVERALL LENGTH: 5 (127) OVERALL DEPTH LESS 2-3/16 ADJUSTING DIAL SHAFT: (56) 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 M9090 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-
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SOLID STATE ECONOMIZER SYSTEM IMPORTANT C7400 Solid State Enthalpy Sensor. All inputs and outputs must be 24 Vac Class 2. C7650 Dry Bulb Temperature Sensor. S963B1128 Remote Potentiometer to provide remote control of Ambient Ratings: damper minimum position. Temperature: -40°F to +149°F (-40°C to +65°C). Humidity: 5 to ST6008 Energy Management Timer for occupied/unoccupied 95 percent RH (noncondensing). control. Inputs: 4-3/8 (112) Enthalpy (C7400) Dry Bulb Temperature (C7650) Discharge Air (C
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SOLID STATE ECONOMIZER SYSTEM WIRING: M7215, M7415, M8405 CAUTION Personal Injury Hazard. All wiring must comply with applicable codes and ordinances. Spring-return assembly can release. Refer to Fig. 9 for typical hookup. Leave end covers attached to the motor. Location and Mounting M7215 L1 TR Locate motor as close as possible to the equipment to be L2 controlled. Refer to Fig. 4 for mounting dimensions. TR1 2-10 + IN+ 1. Mount motor with the shaft horizontal to ensure maxi- VDC CONTROL m
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SOLID STATE ECONOMIZER SYSTEM To mount the C7046C Sensor in a junction box (see Fig. 11): SYSTEM DUCT OR PLENUM 1. Cut a 1/2 in. (13 mm) hole in the duct or plenum surface at the desired location. 2. Remove the center rear knockout from the junction box and insert the sensor probe through the knockout with NO. 8 FLANGE the flange flat against the junction box. MOUNTING 3. Using the flange as a template, mark and drill two holes SCREWS (2) SENSOR PROBE in the junction box and the duct or p
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SOLID STATE ECONOMIZER SYSTEM IMPORTANT Dimensions, Approximate 9.72 in. high x 3.94 in. wide x 2.95 Failure to follow these wiring practices can introduce in. deep (247 mm high x 100 mm wide x 75 mm deep) electrical interference (noise) that can cause erratic Fail Safe Mode Spring Return system operation: Electrical Connections Enclosed screw terminal strip (22 to 14 AWG) (Enclosed screw terminal strip [0.324 to 2.08 sq a. Keep wiring at least one foot away from large induc- mm]) tive loads
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SOLID STATE ECONOMIZER SYSTEM dimensions). Mount device in a location protected from rain, Wiring snow and direct sunlight. Secure device to sheet metal using the two supplied mounting screws. CAUTION Can Cause Electrical Shock or Equipment Damage. CAUTION Disconnect power supply before connecting wiring. Equipment Damage Hazard. Mounting screws longer than 5/8 in. can damage Disconnect the power supply before connecting wiring to internal motor components. prevent electrical shock and equip
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SOLID STATE ECONOMIZER SYSTEM 4500 4000 3500 3,000 OHMS AT 77F (25C) 3000 2500 2000 1500 1000 55 60 65 70 75 80 85 90 95 100 F 20 30 35 15 25 C TEMPERATURE (DEGREES) M20601 M9099 Fig. 16. Mounting the W7212 module on sheet metal. Fig. 17. C7046C and C7150B Air Temperature Sensors resistance versus temperature. C7400 Enthalpy Sensor and C7650A C7400A Solid State Enthalpy Sensor Temperature Sensor Location and Mounting The C7400A Solid State Enthalpy Sensor is used with a solid state economize
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4 mA 6 mA 8 mA 10 mA 12 mA 14 mA 16 mA 18 mA 20 mA SOLID STATE ECONOMIZER SYSTEM 85 90 95 100 105 110 (29) (32) (35) (38) (41) (43) CONTROL CONTROL POINT CURVE APPROX. °F (°C) 80 AT 50% RH (27) A 73 (23) B 70 (21) C 67 (19) D 63 (17) 75 (24) 70 (21) 65 (18) 60 (16) A 55 (13) B 50 C (10) 45 D (7) 40 (4) 35 (2) 1 A B C D 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 (2) (4) (7) (10) (13) (16) (18) (21) (24) (27) (29) (32) (35) (38) (41) (43) APPROXIMAT
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SOLID STATE ECONOMIZER SYSTEM The economizer functions as a true first stage of cooling and M7415 Damper Actuator provides maximum fuel economy during the cooling cycle. The Single M7415 Damper Actuator accepts thermistor sensor economizer is automatically locked out during heating. It holds input from a C7046A or a C7150B Mixed Air Sensor mounted the outdoor air damper at the minimum position setting. On a in discharge or mixed air duct. See Fig. 27. call for cooling by the space thermos
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SOLID STATE ECONOMIZER SYSTEM M7415 and M8405 Damper Actuators W7459A,C Solid State Economizer Logic Adjusting Minimum Position (Ventilation) Module The M7415 Damper Actuator is adjusted for desired minimum Two potentiometers with small screwdriver slots for adjustment position using a Q709 Actuator Mounted Minimum Position are located on the face of the module. Potentiometer and/or a remote S963B1136 Manual Potentiometer. The M8405 Damper Actuator has an integral Minimum Position Adjustme
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SOLID STATE ECONOMIZER SYSTEM The setpoint scale markings, located on the W7459, are A,B,C 3. and D. Turn the setpoint potentiometer fully clockwise to the D a. On the standard (non-differential) economizers, the setting. The economizer selects the air that has lower enthalpy logic module checks the outdoor air C7400 Enthalpy or temperature for cooling; for example, if outdoor air has lower Sensor or C7650 Temperature Sensor to determine if enthalpy or temperature than return air, the outdoor
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SOLID STATE ECONOMIZER SYSTEM Dry Bulb Temperature Sensor(s). The C7400 responds to both OPERATION: W7212 dry bulb temperature and humidity, allowing use of outdoor air at higher temperatures for free cooling when humidity is low. The purpose of the economizer is to use outdoor air for The C7650 responds only to dry bulb temperature; use only in cooling, whenever possible, to reduce compressor operation. dry, arid climates. Power at the N terminal determines the Occupied/Unoccupied The log
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SOLID STATE ECONOMIZER SYSTEM 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 d
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SOLID STATE ECONOMIZER SYSTEM 7. If all minimum and maximum position adjustments are NOTE: Turn the enthalpy setpoint potentiometer fully clock- complete, remove the T-T1 jumper and reconnect the wise to the D setting. mixed air sensor. The logic module selects the lower enthalpy air (return or EQUATION 1. FORMULA TO AID MINIMUM POSITION ADJUSTMENT. outdoor) for cooling. For example, when outdoor air has lower (T × OA)+(T × RA)= T enthalpy than return air, the module calls to open the outdoor
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SOLID STATE ECONOMIZER SYSTEM W7459C ECONOMIZER PACKAGE M8405 ACTUATOR M8405 T MAX T TR TR1 SW APPLY SET 24VAC T-X MIN FOR MIN POSN C7400 + T-D FOR OUTDOOR MAX POSN SENSOR S + O S X D S + 5 R C7400 S RETURN SENSOR 5 1K + 4 1 2 UNOCCUPIED 2K 4 3 ST6008 TIMER X X OCCUPIED T675/T6031 MIXED AIR CONTROL 6 D D 55¡ F SETPOINT W R C Y1 COOL 1 Y1 W T6031 AMBIENT COOL 2 Y2 Y2 R LOCKOUT CONTROL 50¡ F SETPOINT HEAT 2 W2 W2 HEAT 1 W1 W1 FAN X 6 DELAY RELAY G FDR 1 3 G FAN RH L2 FDR 2 R L1 RC (HOT) T73
