Table I - Package Contents. Table 2 - Filter Sizes. Read these instructions completely before attempting to install the Vertical Economizer Accessory

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1 Installation Read these instructions completely before attempting to install the Vertical Economizer Accessory CONTENTS SAFETY CONSIDERATIONS... 1 GENERAL... 1,2 ACCESSORIES LIST INSTALLATION CONFIGURATION ECONOMIZER CONTROL MODES... 6 OPERATION... 1 SEQUENCE OF OPERATION... 1 PERFORMANCE DATA TROUBLESHOOTING WIRING DIAGRAMS SAFETY CONSIDERATIONS Installation and servicing of air-conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should install, repair, or service air-conditioning equipment Untrained personnel can perform the basic maintenance functions of replacing filters All other operations should be performed by trained selwice personnel When working on air-conditioning equipment, observe precautions in the literature, tags, and labels attached to the unit, and other safety precautions that may apply Recognize safety information This is the safety-alert symbol //!'_... When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal iniury Understand these signal words; DANGER, WARNING, and CAUTION. These words are used with the safety-alert symbol DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation Follow all safety codes. Wear safety glasses, protective clothing, and work gloves. Use quenching cloth for brazing operations. Have a fire extinguisher available Read these instructions thoroughly and follow all warnings or cautions included in literature and attached to the unit Consult local building codes and current editions of the National Electrical Code (NEC) NFPA 7 In Canada, refer to current editions of the Canadian electrical code CSA ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death Before installing, modifying, or servicing system, main electrical disconnect switch must be in the OFF position and install a lockout tag. There may be more than 1 disconnect switch. Lock out and tag switch with suitable warning label Instructions UNIT PERFORMANCE AND COMPONENT HAZARD Failure to follow this caution may result in unit damage. For cooling operation, the recommended airflow is 35 to 45 cfm for each 12, Btuh of rated cooling capacity For heating operation, the air, tow must produce a temperature rise that falls within the range stamped on the unit rating plate GENERAL Economizers are recommended for use with only commercial packaged products that have ECM motors. The Economizer system utilizes the latest technology available for integrating the use of free cooling with mechanical cooling for rooftop units. The solid state control system optimizes energy consumption, zone comfort, and equipment cycling by operating the compressors when the outdoor-air temperature is too warm, integrating the compressor with outdoor air when fiee cooling is available, and locking out the compressor when outdoor-air temperature is too cold. Demand ventilation is supported. The Economizer system utilizes gear-&ive technology with a directmount spring return actuator that will close upon loss of power The Economizer system comes standard with an outdoor air temperature sensor, a supply air temperature sensor, and low temperature compressor lockout switch Indoor enthalpy sensors, outdoor enthalpy sensors and CO2 sensors are available for field installation. Barometric relief dampers provide natural building pressurization control. Barometric relief dampers are built into the design and are standard. See Table 1 for package contents. See Table 3 for sensor usage. Table I - Package Contents PART NUMBER QTY DESCRiPTiONS CPECOMZR7A 1 Hood Top and Sides 1 Hood Divider 1 Aluminum Filter 11 #1 Self-Drilling Screw and Washers 4 #1x 1/2" Blunt End Screws 1 #1x 1" Self-Drilling Screws 1 Economizer Assembly 1 Supply Air Temperature Sensor with Bracket 2 1" 12 x 2 Filter* 1 Top Filter Rack 1 Bottom Filter Rack 1 Replacement Return Chamber Panel 1 Compressor Cover Panel 1 Extension Harness w/plug 2 Wiring Diagram Labels Table 2 - Filter Sizes PART NUMBER I-IN,FILTER SIZE 2-IN, FILTER SIZE 1-1 x 2 (254 x 58mm) CPECOMZR7A 2-12 x 2 (34.8 x 58ram) 1-12 x 2 (34.8 x 58ram) *Unscrew two brackets on the top filter rack to fit 2-in. (5.8ram) filters.

2 Table 3 - Economizer Sensor Usage ECONOMIZER WITH OUTDOOR AIR APPLICA- DRY BULB SENSOR TION Accessories Required OutdoorAir None. The outdoor air dry bulb sensor Dry Bulb is factory installed Single Enthalpy Differential Enthalpy CO2 for DCV Control Using a Wall-Mounted CO2 Sensor CO2 for DCV Control Using a Duct-Mounted CO2 Sensor 33ZCSENCO2 H H57AC78 H H57AC78 and CRENTDIF4A* 33ZCSENCO2 or CGCDXSEN4A or CGCDXASP11- ry' and O CRCBDIOX5A ZCASPCO2 or CGCDXASP1"* 2. Remove the compressor access panel and unit side panel. See Fig Make sure the panel covering the bottom return air duct opening has been removed, allowing for unobstructed vertical return. 4. Install the top filter rack in the HVAC unit next to the indoor coil. Bend flange by hand at 9 degrees - Fig. 1. Screw left side of rack in to 4th hole down on coil frame. Use only 1/2" (12.7mm) long blunt end screws. Screw bent flange to unit side panel using 1" long self-drilling screw provided. If using 2" (5.Smm) filter the filter spacer must be removed. NOTE: The filters are accessible through the return duct cover. Install the bottom filter rack. Bend the tab to 9as shown in Fig. 1. Slide the rack to the far left side (when facing the coil) of the HVAC unit. Set the rack in front of the coil and screw the left side of the rack to the coil frame through the pre-punched holes. Maximum screw length 1/2" (12.7mm). Screw the bent flange to the unit side panel using 1" long self-drilling screw provided. Top filter rack *CRENTDIF4A accessory is used on many different base units. As such, these kits may contain parts that wilt not be needed for installation. 1-33ZCSENCO2 and CGCDXSEN4A are accessory CO2 sensors. **33ZCASPCO2 and CGCDXASP1 are accessory aspirator boxes required for duct-mounted applications. 1-1-CRCBDIOX5A is an accessory that contains both 33ZCSENCO2 and 33ZVASPCO2 accessories. ACCESSORIES LIST The economizer has several field-installed accessories available to optimize performance. Refer to Table 4 for authorized parts. Evaporator Coil Screw rack_ to coil frame here _ge at 9 and screw to divider with long screw Table 4 - Economizer Field-Installed Accessories DESCRIPTION PART NUMBER Outdoor Air Enthalpy Sensor HH57AC78 IndoorAir Enthalpy Sensor CRENTDIF4A Return Air CO2 Sensor (4-2mA) CRCBDIOX5A CO2 Room Sensor (4-2mA) Aspirator Box for Duct Mount CO2 Sensor (4-2mA) Space Temperature and CO2 Room Sensor with Override (4-2mA) Space Temperature and CO2 Room Sensor with Override and Set Point (4-2mA) Heat Pump Relay Package INSTALLATION 33ZCSENXO2 or CGCDXSEN4A 33ZCASPCO2 or CGCDXASP1A 33ZCT55CO2 33ZCT56CO2 CPRLYKIT1A Economizer - See Fig. 2 for Economizer component locations. To install the vertical Economizer perform the following procedure: 1. Turn off unit power supply and install lockout tag. ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death. Before installing or se_wicing system, always turn offmain power to system and tag. There may be more than one disconnect switch. Turn off accesso W heater power switch if applicable. Screw rack_ to coil frame here Fig. 1 - Filter Rack Bottom rack 5. Most new 3 Phase HVAC units will have an economizer plug in the return air chamber which runs back to the control box. If the unit has the economizer harness/plug, first remove the jumper plug fiom the end of the harness to allow the plug from the economizer to be connected. NOTE: The jumper plug should be saved for future use in the event that the economizer is removed fiom the unit. The jumper plug is not needed as long as the economizer is installed. In the event that your HVAC unit does not have a factory installed harness for the economizer, the extension harness shipped with the economizer must be installed in the unit. Route the extension harness through the HVAC unit as shown in Fig. 8 & 1. Connect extension harness per wiring diagrams in this booklet. The plug end of the harness extension will connect to the economizer plug in the return chamber and the other end will be routed to and connect in the control box. 2

3 Hood Low Ambienl Com_ Lockout -O= O-" Damper, Filter Clip Outside Air 1_ Temperature 4 Sensor i: _ Outside Air Damper Hood Divi nable Aluminum Filter Econo Actuator [--"- Behind Panel Barometric Airflow Fig. 2 - Component Locations Fig. 5 - Filter Installation HVAC Unit 1 5/16" Compressor Cover Replacement Panel Shipped with Economizer NOTE: On units with base rails this compressor shipped with the HVAC unit, Compressor )artment Replacement Leturn Chamber Shipped with Economizer *Filter Access Panel Also Access to Economizer Controls 21 7/16" Hood 2 9/16" Side Panel shipped with HVAC unit. Remove and Discard NOTE: Units with base rails will have a 2 piece panel. Discard the pane+ covering the return air chamber and reuse the panel covering the compressor section. Indoor Blower I Fig. 6 - Economizer Installation Fig. 3 - Panel Removal ",, Compressor./ 18 3/4" 2 1/4" Fig. 6A 2 Hood Top and Side Assembly Replacement Return Chamber Panel Outside Damper Provided Air Compressor Access Panel Provided with Economizer. On units with base rails this compressor cover panel is shipped with the HVAC unit. with Economizer I J Hood Divider Relief Dampers/ Fig. 4 - Hood Assembly 3 Fig. 7 - Economizer Installed in HVAC Unit

4 Economizer Economizer Harness from and controller Economizer Rainhood Main 24V )lice Box Self-Drilling Screw SAT Sensor' on Bracket, Economizer Harness Indoor Indoor Blower Panel Compressol Supply Air Temperature (See Fig. 8A) j// Fig. 8 - Routing Harness Extension and Mounting SAT Sensor Fig. 8A - SAT Mounting for Units with Upper Block Off Panel Supply Air Teml: Economizer Sensor (SAT)_ U Indoor Blower Economizer Hood SA Ii... Economizer Plug Indoor Fan Harness / Control ComF To SAT Sensor Fig. 1 - Routing Harness (Top View) Economizer Harness Fig. 9 - SAT Location for Units without Block Off Panel Remove Blower Panel Fig Indoor Blower Panel 4

5 6. Remove the panel on the HVAC unit covering the indoor blower. See Fig. 11. The (provided) Supply Air Temperature (SAT) sensor, which looks like and eyelet terminal, must be installed in the blower section. Attach the (2) pink wires from the economizer harness (or extension harness) to the SAT. The SAT sensor is shipped attached to a small bracket. If the HVAC unit has an upper block off panel, attach the sensor / bracket as shown in Fig. 8Ausing a #1 x 5/8" self-drilling screw. If the unit does not have an upper block off panel, remove the bracket from the SAT and screw the SAT to the side of the indoor blower, using a #1 x 5/8"self-drilling screw, as shown in Fig. 9. Upper Block-off panel (som_s) IS_ SEE 7. Replace the panel covering the indoor blower. NOTE: For heat pump units, an additional relay package, Facto W Mt part number CPRLYKIT1A, or a field provided relays must be installed in the blower section. See heat pump diagram for details. Installation of Heat Pump Relays / 2 O co INDOOR r BLOWER O OTE 1 When this economizer is used on heat pump HVAC units, relays must be added for proper operation. The relays, which are shown on the attached diagrams, can be field supplied, or relay kit CPRLYKIT1A can be ordered. Field provided relays must be: SPDT, one pole normally open and one normally closed. Same polarity. Minimum 124 VA inrush. Acceptable relays include: Honeywell: R8222B 117 Honeywell: R422B 1124 White Rodgers: White Rodgers: Relay Installation: A. If the optional relay kit CPRLYKIT1A is used, it will mount underneath the indoor blower as shown in Fig. 12 & 13. Follow instructions sent with the package. B. If relays are field provided and installed, they can be mounted above the upper block off panel, as shown in Fig. 12. Use caution to ensure screws to do not interfere with blower operation, Blunt end screws are recommended. C. If no upper block off panel is present mount relays on compressor partition below indoor blower on left as shown in Fig. 12. D. Wire the relays per diagram in this instruction. 8. Install the economizer assembly into the return air chamber, making sure the economizer completely covers the bottom return air opening. See Fig. 6. Remove the red shipping tape holding the relief dampers closed. NOTE: The hole in the center of the bottom of the economizer will line up with the mating hole in the HVAC base - however do not insert screw yet. 9. Install the replacement return chamber panel over the economizer assembly and underneath the drip flange on the HVAC unit. Line up the bottom center hole on the panel with the hole in the bottom of the economizer and the mating hole in the base of the HVAC unit. Insert screw, which will hold all parts in place. Insert screws on bottom, left, and right of panel and on panel right side as well. See Fig. 6. /,. NOTE 1: Field provided relays can be mounted on upper block off panel, ifapplicable CPRLYKIT1A relay kit Fig Relay Kit Location indoor BLOWER Location for heat Fig Relay Kit Installation pump relay package number CPRLYKIT1A

6 1. Remove the hood parts from the economizer package. Assemble as shown in Fig. 4 by screwing together with provided # 1 x 5/8" screws. 11. Caulk or gasket the back side of the hood mating flanges. Install assembled hood over the economizer opening in the replacement return chamber panel. Screw in place through pre-punched holes. Make sure all seams are watertight. 12. ()pen the filter clips on the inside of the hood top. Insert the aluminum filter into the hood and close the clips to hold in place. See Fig Remove the filter access panel (horizontal return panel) and install disposable filters in filter rack behind filter clips. Fig. 1. See Table 2 for filter sizes. NOTE: The economizer control settings and the filters are accessible through the horizontal return opening on side of HVAC unit. See Fig Through the filter access door (horizontal return panel), adjust the settings on the economizer controller. Review the settings in the Operation section: 1. The standard economizer controller has a facto1t setting of 63oF (17 C) for the outdoor air temperature changeover and 55 F (13 C) for the supply air (mixed air) temperature sensor. The outdoor air temperature changeover setting is adiusted on the sensor by setting the dip switches on the sensor. The ABCD potentiometer on the economizer controller should be set to the "D" position. 2. The low ambient compressor lockout switch setting is fixed at 42 F (6 oc). 3. The minimum position for the outdoor air damper can be configured at the controller. When not using a CO 2sensor, the DCV Max potentiometer must be completely closed (CCW) I_rthe Minimum Position potentiometer to function correctly. 4. Settings for the optional outdoor enthalpy sensor, indoor enthalpy sensor, and CO 2sensor can also be cow,figured at the controller. 15. Replace the filter access panel. Screw in place. 16. Install the compressor access panel provided with the economizer. Secure to HVAC unit per Figs. 6 and 7. Units with base rails will have compressor panel shipped with. 17. Install all economizer accessories then power HVAC unit and test cycle economizer. Economizer Standard Sensors CONFIGURATION OUTDOOR AIR TEMPERATURE (()AT) SENSO_ The outdoor air temperature sensor (HH57AC8) is a 1 to 2mA device used to measure the outdoor-air temperature. The outdoor-air temperature is used to determine when the Economizer can be used for free cooling. The operating range of temperature measurement is 4 to 1 F (4 to 38 C). The sensor has 8 selectable temperature changeover setpoints. The temperature changeover is set using the 3 dip switches on the sensor. The ABCD potentiometer on the controller should be set to the "D" position. See Fig. 15. SUPPLY AIR TEMPERATURE (SAT) SENSOR The supply air temperature sensor is a 3 Kf_ thermistor located at the inlet of the indoor fan. See Fig. 8 and 9. This sensor is field installed. The operating range of temperature measurement is (-18 C) to 158 F (7 oc). See Table 5 for sensor temperature/resistance values. The temperature sensor looks like an eyelet terminal with wires running to it. The sensor is located in the "crimp end" and is sealed fiom moisture. LOW TEMPERATURE COMPRESSOR LOCKOUT SWITCH The Economizer is equipped with a low ambient temperature lockout switch located in the outdoor airstream which is used to lock out Table 5 - Supply Air Sensor Temperature Resistance Values TEMPERATURE (F) CELSIUS (C) RESISTANCE (ohms) , , , , , , , , , , Economizer Control Modes Determine the Economizer control mode before set up of the control. Some modes of operation may require different sensors. Refer to Table 3. The Economizer is supplied fiom the facto_t with a supply air temperature sensor, a low temperature compressor lockout switch, and an outdoor air temperature sensor. This allows for operation of the Economizer with outdoor air &y bulb changeover control. Additional accessories can be added to allow for different types of changeover control and operation of the Economizer and unit. OUTDOOR DRY BULB CHANGEOVE_ The standard controller is shipped from the factory configured for outdoor dry bulb changeover control. The outdoor air and supply air temperature sensors are included as standard. For this control mode, the outdoor temperature is compared to a selectable set point on the sensor. See Fig. 15. If the outdoorair temperature is above the set point, the Economizer will adiust the outdoor air dampers to minimum position. If the outdoor-air temperature is below the set point, the position of the outdoor-air dampers will be controlled to provide free cooling using outdoor air. When in this mode, the LED next to the free cooling set point potentiometer will be on. The changeover temperature set point is set using the switches on the sensor. See Fig. 15 for the corresponding temperature changeover values. OUTDOOR ENTHALPY CHANGEOVE_For enthalpy control, accessory enthalpy sensor (part number HH57AC78) is required. Replace the standard outdoor dry bulb temperature sensor with the accessory enthalpy sensor in the same mounting location. I 6

7 Exhaust Fan Set LED Lights Exhaust Contact is made Minimum Dam Position Setting Maximum Damper Demand / Control Ventilation SetpoJnt LED Light when Demand Control Ventilation Input is Above Set Demand Ventilation Control Setpoint LED Light when Outdoor Air is Suitable for Free Cooling Enthalpy Changeover Setpoint Fig Economizer Controller Potentiometer LED Locations When the outdoor air enthalpy rises above the outdoor enthalpy changeover set point, the outdoor-air damper moves to its minimum position. The outdoor enthalpy changeover set point is set with the outdoor enthalpy set point potentiometer on the Economizer controller. The set points are A, B, C, and D. See Fig. 17. The factory-installed 62-ohm jumper must be in place across terminals SR and SR+ on the Economizer controller. DIFFERENTIAL ENTHALPY CONTROL For differential enthalpy control, the Economizer controller uses two enthalpy sensors (HH57AC78 and CRENTDIF4A), one in the outside air and one in the return airstream. The Economizer controller compares the outdoor air enthalpy to the return air enthalpy to determine Economizer use. The controller selects the lower enthalpy air (return or outdoor) for cooling. For example, when the outdoor air has a lower enthalpy than the return air and is below the set point, the Economizer opens to bring in outdoor air for tree cooling. Replace the standard outside air dry bulb temperature sensor with the accessory enthalpy sensor in the same mounting location. Mount the return air enthalpy sensor in the return air duct. See Fig. 16. When using this mode of changeover control turn the enthalpy set point potentiometer tully clockwise to the D setting. DiP' SWITCH CHANGEOVER POSiTiON TEM PE_TU RE t _F 5B_F ECONOMIZER 123 t 23 58_F 63_F _ AIR 68eF 12:3 73_F 1 2:3 1 2:3 Fig Outdoor Air Temperature Changeover Set Points URN DUCT P" (FIELD-PROVIDED) Fig Return Air Enthalpy Sensor Mounting Location INDOOR AIR QUALITY (IAQ) SENSOR INPUT The IAQ input can be used for demand control ventilation control based on the level of CO: measured in the space or return air duct. Mount the accesso W IAQ sensor according to manufacturer specifications. The IAQ sensor should be wired to the AQ and AQ 1 terminals of the controller. Adjust the DCV potentiometers to correspond to the DCV voltage output of the indoor air quality sensor at the user-determined set point. See Fig. 19. If a separate field-supplied transformer is used to power the IAQ sensor, the sensor must not be grounded or the Economizer control board will be damaged.

8 ! f4 CONTROL CURVE A B C D CONTROL POINT _,_ APPROX. F (_C) AT 5% RH _q" 73(23) 7 (21) 67 (19) 63 (17) R (2) (4) (7) (1) (13) (16) (18) (21) (24) (27) (29) (32) (35) (38) (41) (43) APPROXIMATE DRY BULB TEMPERATURE-- F ( C) Fig Enthalpy Change over Setpoints Set N1 EXH '_7 v N 2V 1V -P1 Ex 24 r_-_24 vac VactlOl I COM E v z 6 5 '_ CO 2MAX RANGE SETTING &Qt T_ DCV 2V Open vlov DCV _ SO+ -_ DCev SO_ 2V vlv F o, 5 31_ 1'--7 4 EF_ EF1 i,j i z w z< lk ppm --_-9 ppm --*--1 ppm --_--11 ppm DAMPER VOLTAGE FOR MAX VENTILATION RATE _J Fig Economizer Controller Fig CO 2 Sensor Maximum Range Setting 8

9 EXHAUST SET POINT ADJUSTMENT_he exhaust set point will determine when the exhaust fan runs based on damper position (if power exhaust is installed). The set point is modified with the Exhaust Fan Set Point (EXH SET) potentiometer. The set point represents the damper position above which the exhaust fans will be turned on. When there is a call for exhaust, the Economizer controller provides a 45 ± 15 second delay before exhaust tan activation to allow the dampers to open. This delay allows the damper to reach the appropriate position to avoid unnecessary tan overload. MINIMUM POSITION CONTROL There is a minimum damper position potentiometer on the Economizer controller. See Fig. 14. The minimum damper position maintains the minimum airflow into the building during the occupied period. When using demand ventilation, the minimum damper position represents the minimum ventilation position for VOC (volatile organic compound) ventilation requirements. The maximum demand ventilation position is used for fully occupied ventilation. When demand ventilation control is not being used, the minimum position potentiometer should be used to set the occupied ventilation position. The DCV Max potentiometer must be tully closed (CCW) to allow the Minimum Position potentiometer to function correctly. Adjust the minimum position potentiometer to allow the minimum amount of outdoor air, as required by local codes, to enter the building. Make minimum position adjustments with at least 1 F (5.5 C) temperature difference between the outdoor and return-air temperatures. To determine the minimum position setting, perform the following procedure: 1. Calculate the appropriate mixed air temperature using the following formula: (To x OA/1) + (TR x RA/1) TO Outdoor-Air Temperature OA Percent of OutdoorAir TR Return-Air Temperature RA Percent of Return Air TM Mixed-Air Temperature TM As an example, if local codes require 1% outdoor air during occupied conditions, outdoor-air temperature is 6oF (15.6 o C), and return-air temperature is 75oF (23.9 oc). (6 x.1) + (75 x.9) 73.5 F (23.1 C) 2. Disconnect the supply air sensor from terminals T and T1. 3. Ensure that the Ihctory-installed jumper is in place across terminals P and P 1. If remote damper positioning is being used, make sure that the terminals are wired according to Fig. 9 and that the minimum position potentiometer is turned fully clockwise. 4. Connect 24 vac across terminals TR and TR1. 5. Carefully adjust the minimum position potentiometer until the measured mixed-air temperature matches the calculated value. 6. Reconnect the supply air sensor to terminals T and T1. Remote control of the Economizer damper is desirable when requiring additional temporary ventilation. If a field-supplied remote potentiometer (Honeywell part number $963B 1128) is wired to the Economizer controller, the minimum position of the damper can be controlled from a remote location. To control the minimum damper position remotely, remove the Ihctory-installed jumper on the P and P 1 terminals on the Economizer controller. Wire the field-supplied potentiometer to the P and P1 terminals on the Economizer controller. DAMPER MOVEMENT Damper movement from full open to full closed (or vice versa) takes 2 1/2 minutes. THEPdMOSTATS The Economizes control works with conventional thermostats that have a Y1 (cool stage 1), Y2 (cool stage 2), W1 (heat stage 1), W2 (heat stage 2), and G (tan). The Economizer control does not support space temperature sensors. Connections are made at the thermostat terminal connection board located in the main control box. OCCUPANCY CONTROL The factory default configuration for the Economizes control is occupied mode. Occupied status is provided by the black jumper from terminal TR to terminal N. When unoccupied mode is desired, install a field supplied timeclock function in place of the jumper between TR and N. When the timeclock contacts are closed, the Economizer control will be in occupied mode. When the timeclock contacts are open (removing the 24-v signal from terminal N), the Economizer IV will be in unoccupied mode. DEMAND CONTROLLED VENTILATION (DCV) When using the Economizer for demand controlled ventilation, there are some equipment selection criteria which should be considered. When selecting the heat capacity and cool capacity of the equipment, the maximum ventilation rate must be evaluated for design conditions. The maximum damper position must be calculated to provide the desired fie sh air. Typically the maximum ventilation rate will be about 5 to 1% more than the typical cfm required per person, using normal outside air design criteria. An exponential anticipatory strategy should be taken with the following conditions: a zone with a large area, varied occupancy, and equipment that cannot exceed the required ventilation rate at design conditions. Exceeding the required ventilation rate means the equipment can condition air at a maximum ventilation rate that is greater than the required ventilation rate for maximum occupancy. An exponentialanticipatory strategy will cause the fresh air supplied to increase as the room CO2 level increases even though the CO2 set point has not been reached. By the time the CO2level reaches the set point, the damper will be at maximum ventilation and should maintain the set point. In order to have the CO2sensor control the economizer damper in this manner, first determine the damper voltage output for minimum or base ventilation. Base ventilation is the ventilation required to remove contaminants during unoccupied periods. The following equation may be used to determine the percent of outside-air entering the building for a given damper position. For best results there should be at least a 1 F (5.5 C) difference in outside and return-air temperatures. (To x OA/1) + (TR x RA/1) TM TO Outdoor-Air Temperature OA Percent of Outdoor Air TR Return-Air Temperature RA Percent of Return Air TM Mixed-Air Temperature Once base ventilation has been determined, set the minimum damper position potentiometer to the correct position. The same equation can be used to determine the occupied or maximum ventilation rate to the building. For example, an output of 3.6 volts to the actuator provides a base ventilation rate of 5% and an output of 6.7 volts provides the maximum ventilation rate of 2% (or base plus 15 cfm per person). Use Fig. 19 to determine the maximum setting of the CO2sensor. For example, a 11 ppm set point relates to a 15 cfm per person design. Use the 11 ppm curve on Fig. 19 to find the point when the CO: sensor output will be 6.7 volts. Line up the point on the graph with the left side of the chart to determine that the range configuration for the CO: sensor should be 18 ppm. The Economizer controller will output the 6.7 volts from the CO: sensor to the actuator when the CO2concentration in the space is at 11 ppm.

10 TheDCVsetpointmaybeleftat2volt sincetheco:sensor voltage willbeignored bytheeconomizer controller untilitrisesabove the3.6 voltsettingoftheminimumposition potentiometer. Oncethefullyoccupied damper positionhasbeendetermined, sethe maximum damper demand control ventilation potentiometer tothis position. Donotsetothemaximum positionasthiscanresult inoverventilation tothespace andpotential high-humidity levels. CO2SENSOR CONFIGURATION TheCO2sensor haspreset standard voltage settings thatcanbeselected anytime after thesensor is powered up.seetable6. Usesetting1or2forequipment. SeeTable6. 1.PressClearandModebuttons. Holdatleast5seconds until thesensor enters theeditmode. 2.PressModetwice.TheSTDSET Menuwillappear. 3.UsetheUp/Down button toselect thepreset number. See Table6. 4.PressEnter tolockintheselection. 5.PressModetoexitandresume normal operation. Thecustomsettings oftheco:sensor canbechanged anytime afterthe sensor isenergized. Followthestepsbelowtochange thenon-standard settings: 1.PressClearandModebuttons. Holdatleast5seconds until thesensor enters theeditmode. 2.PressModetwice.TheSTDSET Menuwillappear. 3.UsetheUp/Down button totoggletothenonstdmenu andpressenter. 4.UsetheUp/Down button totoggletfuougheachofthenine variables, startingwithaltitude, untilthedesired setting is reached. 5.PressModetomovethrough thevariables. 6.PressEnter tolockintheselection, thenpressmodeto continue tothenextvariable. DEHUMIDIFICATION OFFRESHAIRWITHDCVCONTROL Information fiomashrae indicates that thelargest humidity loadon anyzoneisthefreshairintroduced. Forsomeapplications, anenergy recovery unitcanbeadded toreduce themoisture content ofthefiesh airbeingbrought intothebuildingwhentheenthalpy ishigh. Inmost cases, thenormal heating andcoolingprocesses aremorethanadequate toremove thehumidity loads formostcommercial applications. Ifnormal rooftop heating andcoolingoperation isnotadequate fortheoutdoor humidity level,anenergy recovery unitand/or adehumidification optionshould beconsidered. SETTING EQUIPMENT OUTPUT Interface w/standard Building Control Economizer Health & Safety System Table 6 - CO 2Sensor Standard Settings Proportional Proportional Exponential Proportional Proportional Exponential Exponential Proportional VENTILATION RATE (cfm/person) Any Any Any Parking/Air Intakes/ Loading Docks Proportional O OPERATION Sequence of Operation When free cooling is not available, the compressor will be controlled by the thermostat. When free cooling is available, the outdoor-air damper is modulated by the Economizer control to provide a 5oto 55 F (1 to 12.8 C) supply-air temperature into the zone. As the supply-air temperature fluctuates above 55 F (12.8 C) or below 5F (1 C), the dampers will be modulated (open or close) to bring the supply-air temperature back within the set points. For Economizer operation, there must be a thermostat call for the lhn (G). This will move the damper to its minimum position during the occupied mode. NOTE: The DCV Max potentiometer must be completely closed (CCW) when not using CO 2sensor. Above 5oF (1 C) supply-air temperature, the dampers will modulate fiom 1% open to the minimum open position. From 5oF (1 C) to 45 F (7.2 C) supply-air temperature, the dampers will maintain at the minimum open position. Below 45 F (7.2 C), the dampers will be completely shut. As the supply-air temperature rises, the dampers will come back open to the minimum open position once the supply-air temperature rises to 48oF (8.9 C). If power exhaust is installed, as the outdoor-air damper opens and closes, the power exhaust fans will be energized and deenergized. If field-installed accessory CO: sensors are connected to the Economizer control, a demand controlled ventilation strategy will begin to operate. As the CO 2 level in the zone increases above the CO: set point, the minimum position of the damper will be increased proportionally. As the CO: level decreases because of the increase in fresh air, the outdoorair damper will be proportionally closed. Damper position will follow the higher demand condition from DCV mode or free cooling mode. Damper movement from full closed to full open (or vice versa) will take between 1 1/2 and 2 1/2 minutes. If free cooling can be used as determined from the appropriate changeover command (dry bulb, enthalpy curve, or differential enthalpy), a call for cooling (Y1 closes at the thermostat) will cause the control to modulate the dampers open to maintain the supply air temperature set point at 5oto 55 F (1 to 12.8 C). As the supply air temperature drops below the set point range ofs to 55 F (1 to 12.8 C), the control will modulate the outdoor-air dampers closed to maintain the proper supply-air temperature. ANALOG OUTPUT -1V 4-2mA 2-1V 7-2mA -1V 4-2mA -1V 4-2mA -1V 4-2mA -1V 4-2mA -1V 4-2mA -1V 4-2mA -1V 4-2mA 1 CO 2 CONTROL RANGE (ppm) OPTIONAL RELAY SETPOINT (ppm) OO RELAY HYSTERESIS (ppm) O

11 Table 7 - AIRFLOW DATA WITH ECONOMIZER, WET COIL AND 1 IN (25.4mm) FILTER Model Motor Wire External Static Pressure (in W.C.) Capacity Unit Base Speed Color Composite High Black Base Rails High Black Composite High Black Base Rails High Black * Composite High Black * Base Rails High Black NOTE: Data in this table is derived tiom Dry Coil, Wet Coil, Economizer with l-in. Filter and Filter Pressure Drop Table in unit Product Data. *Excluding 3 ton 14SEER HP & Dual Fuel Models TROUBLESHOOTING See Table 8 for Economizer logic. An Economizer simulator program is available to help with Economizer training and troubleshooting. Economizer Preparation _his procedure is used to prepare the Economizer for troubleshooting. No troubleshooting or testing is done by performing the following procedure. NOTE: This procedure requires a 9-v battm% 1.2 kilo-ohm resistor, and a 5.6 kilo-ohm resistor which are not supplied with the Economizer. 1. Disconnect power at TR and TR1. All LEDs should be of Exhaust tan contacts should be open. 2. Disconnect device at P and Pl. 3.,lumper P to Pl. 4. Disconnect wires at T and T1. Place 5.6 Mlo-ohm resistor across T and T1. 5.,lumper TR to Jumper TR to N. 7. If connected, remove sensor from terminals SO and +. Connect 1.2 kilo-ohm 474EJM checkout resistor across terminals SO and Put 62-ohm resistor across terminals SR and Set minimum position, DCV set point, and exhaust potentiometers tully CCW (counterclockwise). 1. Set DCV maximum position potentiometer fully CW (clockwise). 11. Set enthalpy potentiometer to D. 12. Apply power (24 vac) to terminals TR and TR1. Differential Enthalpy To check differential enthalpy: 1. Make sure Economizer preparation procedure has been performed. 2. Place 62-ohm resistor across SOand Place 1.2 kilo-ofun resistor across Sa and +. The Free Cool LED should be lit. 4. Remove 62-ohm resistor across SOand +. The Free Cool LED should turn of 5. Return Economizer settings and wiring to normal after completing troubleshooting. Single Enthalpy To check single enthalpy: 1. Make sure Economizer preparation procedure has been performed. 2. Set the enthalpy potentiometer to A (tully CCW). The Free Cool LED should be lit. 3. Set the enthalpy potentiometer to D (fully CW). The Free Cool LED should turn off. 4. Return Economizer settings and wiring to normal after completing troubleshooting. DCV (Demand Controlled Ventilation) and Power Exhaus_ To check DCV and Power Exhaust: 1. Make sure Economizer preparation procedure has been performed. 2. Ensure terminals AQ and AQ1 are open. The LED for both DCV and Exhaust should be of The actuator should be tully closed. 3. Connect a 9-v battm T to AQ (positive node) andaq1 (negative node). The LED for both DCV and Exhaust should turn on. The actuator should &ive to between 9 and 95% open. 4. Turn the Exhaust potentiometer CW until the Exhaust LED turns off. The LED should turn off when the potentiometer is approximately 9%. The actuator should remain in position. 5. Turn the DCV set point potentiometer CW until the DCV LED turns of The DCV LED should turn off when the potentiometer is approximately 9-v. The actuator should drive fully closed. 6. Turn the DCV and Exhaust potentiometers CCW until the Exhaust LED turns on. The exhaust contacts will close 3 to 12 seconds after the Exhaust LED turns on. 7. Return Economizer IV settings and wiring to normal after completing troubleshooting. 11

12 DCV Minimum and Maximum Position To check the DCV minimum and maximum position: 1. Make sure Economizer preparation procedure has been performed. 2. Connect a 9-v battery to AQ (positive node) and AQ1 (negative node). The DCV LED should turn on. The actuator should &ive to between 9 and 95% open. 3. Turn the DCV Maximum Position potentiometer to midpoint. The actuator should &ive to between 2 and 8% open. 4. Turn the DCV Maximum Position potentiometer to fully CCW. The actuator should drive fully closed. 5. Turn the Minimum Position potentiometer to midpoint. The actuator should drive to between 2 and 8% open. 6. Turn the Minimum Position Potentiometer fully CW. The actuator should drive fully open. 7. Remove the jmnper from TR and N. The actuator should drive fully closed. 8. Return Economizer settings and wiring to normal after completing troubleshooting. Supply-Air Input To check supply-air input: 1. Make sure Economizer preparation procedure has been performed. 2. Set the Enthalpy potentiometer to A. The Free Cool LED turns on. The actuator should drive to between 2 and 8% open. 3. Remove the 5.6 kilo-ohm resistor and jumper T to T1. The actuator should drive fully open. 4. Remove the jumper across T and T 1. The actuator should drive fully closed. 5. Return Economizer settings and wiring to normal after completing troubleshooting. Economizer Troubleshooting Completion This procedure is used to return the Economizer to operation. No troubleshooting or testing is done by performing the following procedure. 1. Disconnect power at TR and TR1. 2. Set enthalpy potentiometer to previous setting. 3. Set DCV maximum position potentiometer to previous setting. Set DCV Max potentiometer to fully closed (CCW) when not using a CO 2sensor. 4. Set minimum position, DCV set point, and exhaust potentiometers to previous settings. 5. Remove 62-ohm resistor fiom terminals SR and Remove 1.2 ldlo-ohm checkout resistor fiom ternainals SO and +. If used, reconnect sensor from terminals SO and Remove jumper from TR to N. 8. Remove jumper from TR to Remove 5.6 ldlo-ohm resistor from T and T1. Reconnect wires at T and T1. 1. Remove jumper from P to P1. Reconnect device at P and P1. 11.Apply power (24 vac) to terminals TR and TRI. Demand Control Ventilation (DCV) Below set (DCV LED Off) Above set (DCV LED On) INPUTS Outdoor Enthalpy High (Free Cooling LED Off) Low (Free Cooling LED On) High (Free Cooling LED Off) Low (Free Cooling LED On) Table 8 - Economizer Input/Output Logic Return Low Compressor Y1 Y2 Stage Stage Occupied 1 2 On On On On Minimum position On Off On Off Off Off Off Off High On On On Off On Off Off Off Off Off Off Off Low On On On On On Off On Off Off Off Off Off High On On On Off On Off Off Off Off Off Off Off OUTPUTS Modulating** (between min. position and full-open) Minimum position N Terminal Modulating (between rain. position and DCV maximum)ll Modulating*** Damper Unoccupied Closed Modulating** (between closed and full-open Closed Modulating (between closed and DCV maximum)li Modulatingi-St *For single enthalpy control, the module compares outdoor enthalpy to the ABCD set point. J-Power at N terminal determines OccupiedATnoccupied setting: 24 vac (Occupied), now power (Unoccupied). **Modulating is based on the supply-air sensor signal. J-J-Modulation is based on the DCV signal. ***Modulation is based on the greater of DCV and supply-air sensor signals, between minimum position and either maximum position (DCV) or fully open (supply-air signal). J-JJ-Modulating is based on the greater of DCV and supply-air sensor signals, between closed and wither maximum position (DCV) or fully open (supply-air signal). 12

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