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Summary of Contents for MicroMetl ECD-SRT SA Series
- Page 1 Economizer ECD-SRTSA-DW Install Guide Foremost HVAC Accessory Manufacturer...
- Page 2 Table of Contents Topic Page Number General...
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Page 3: Table Of Contents
Small Rooftop Products Select 2 to 15 Tons Vertical Economizer Accessory with W7212 Electro-Mechanical Controls Installation Instructions ECD-SRT**SA Series Economizer with W7212 Controller Read these instructions completely before attempting to install the CAUTION Vertical economizer Accessory. CUT HAZARD CONTENTS Failure to follow this caution may result in personal injury. Sheet metal parts may have sharp edges or burrs. -
Page 4: Economizer Sensor Usage
Table 2 - Package Contents WARNING PACKAGE NO. CONTENTS ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury and/or Hood Top and Sides Hood Divider death. ECD-SRT12SA Aluminum Filter Disconnect power supply and install lockout tag before attempting to ECD-SRT34SA Screws install accessory. - Page 5 Filter Access Panel HVAC Unit Filters Wiring Harness Damper Controller Insert Screw in Economizer Economzier Flanges Compressor Access Panel Outdoor-Air Opening and Indoor Coil Access Panel Fig. 5 - Economizer Installed in HVAC Unit Fig. 2 - Typical Outdoor-Air Section (ECD-SRT12SA Shown) Access Panel Locations Unit Filter...
- Page 6 Unit Without Economizer or Economizer 2 Position Damper Fig. 7 - Economizer Wiring Thermostat Center Post Connection 16. Review the controller setting options in the Configuration section. Access Panel On -DWFS economizers with fixed dry bulb, the outside air temperature will allow free-cooling below 70 degrees F. On -DWDS economizers the outside air temperature allowed for free-cooling is adjustable on the C7660 sensor.
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Page 7: Configuration
THERMOSTATS — The economizer control works with conventional The minimum position for the outdoor damper can be configured at the controller. When not using CO2 sensors, thermostats that have a Y1 (cool stage 1), Y2 (cool stage 2), W1 (heat set the DCV Max potentiometer to completely closed stage 1), W2 (heat stage 2), and G (fan). - Page 8 FIXED DRY BULB OUTDOOR AIR TEMPERATURE SENSOR DIFFERENTIAL ENTHALPY CONTROL (-DWZS Models) — For (-DWFS Models) — For this control mode the, the outside air differential enthalpy control, the economizer controller uses two enthalpy temperature is compared to the fixed temperature on the OA sensor, sensors, 9901-0018 in the outside air and 9901-0018 in the return which is 70 degrees.
- Page 9 CONTROL CONTROL POINT CURVE APPROX. AT 50% RH 73 (23) 70 (21) 67 (19) 63 (17) Fig. 14 - Enthalpy Changeover Setpoints Fig. 15 - W7212 Controller Fig. 16 - Proportional and Exponential Control...
- Page 10 MINIMUM DAMPER POSITION CONTROL —There is a minimum REMOTE CONTROL OF DAMPER POSITION - Remote control damper position potentiometer on the W7212 controller. (See Fig. 11). of the economizer damper is desirable when additional temporary Adjust the Min Pos potentiometer to allow the minimum or base amount ventilation may be required.
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Page 11: Sequence Of Operation
To set up DCV: Factory-supplied sensors offer the option of changing to an exponential anticipatory response (see Fig. 16) which generates higher output Disconnect the CO2 sensor if already connected. voltages at midrange sensor readings to make the controller introduce Determine and set the minimum damper position per the MINIMUM more outside ventilation air at lower CO2 concentrations. -
Page 12: Performance Data
If a field-installed accessory CO2 sensor is connected to the economizer control, a demand controlled ventilation strategy will begin to operate in parallel with the free cooling strategy. As the CO2 level in the zone increases above the CO2 set point position (as controlled by the DCV set potentiometer), the position of the damper will be increased proportionally to the DCV Max position (as controlled by the DCV Max potentiometer). -
Page 13: Troubleshooting
W7212 CHECKOUT AND TROUBLESHOOTING Checkout requires a 9V battery, 620 ohm, 1.2K ohm, Open 5.6K ohm, and 6.8K ohm resistors. Use table 7 and Fig. 20 for DC VOLTMETER checkout. CAUTION C7400 Free Cool Equipment Damage Hazard. Excessive force can damage potentiometer controls. - Page 14 Table 7. Checkout for Economizer (Continued) Step Checkout Procedure Proper Response DIFFERENTIAL ENTHALPY Execure step one, Checkout Preparation. — Turn DCV MAX to mid position. Place 620 ohm resistor across S and + (white sleeve resistor — makes OA enthalpy low). Place 1.2K ohm resistor across S and + (purple sleeve resistor Free cool LED turns on;...
- Page 15 905 Southern Way, Sparks, Nevada 89431 Suite 300 Indianapolis, IN 46226 Manufacturer reserves the right to discontinue, or change at any time, specifications, designs and prices without notice and without incurring obligations. Copyright MicroMetl Corporation 2016 All rights reserved. Form No. 18476-2P...
- Page 16 Siemens Non-Communicating Actuator, No Controls, Wiring For PremierLink, ECD-SRT12SA-D00S-4 RTU Open, SystemVU Siemens Non-Communicating Actuator, Differential Adjustable Dry Bulb, ECD-SRT12SA-DWXS W7212 Controller Siemens Non-Communicating Actuator, Differential Fixed Dry Bulb, W7212 ECD-SRT12SA-DWZS Controller Visit our website at WWW.MICROMETL.COM and blog BLOG.MICROMETL.COM...
- Page 17 Siemens Non-Communicating Actuator, Differential Adjustable Dry Bulb, ECH-SRT34SA-DWXS W7212 Controller Siemens Non-Communicating Actuator, Differential Fixed Dry Bulb, W7212 ECH-SRT34SA-DWZS Controller ECH-SRT34SA-D00S Siemens Non-Communicating Actuator only, No Controls Visit our website at WWW.MICROMETL.COM and blog BLOG.MICROMETL.COM Visit our website at WWW.MICROMETL.COM and blog BLOG.MICROMETL.COM...
- Page 18 Belimo MFT Actuator, No Controls, Wiring For PremierLink, RTU Open, Sys- ECD-SRT05SA-D00B-X temVU Siemens Non-Communicating Actuator, No Controls, Wiring For PremierLink, ECD-SRT05SA-D00S-4 RTU Open, SystemVU Visit our website at WWW.MICROMETL.COM and blog BLOG.MICROMETL.COM Visit our website at WWW.MICROMETL.COM and blog BLOG.MICROMETL.COM...
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