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Installation Guide for TRANE models including: BAYECON107A, BAYECON108A, BAYRLAY006B, BAYECON107A Down Discharge Economizer and Rain Hood, BAYECON107A, Down Discharge Economizer and Rain Hood, Economizer and Rain Hood, Rain Hood, Hood
18-HE138D1-1A-EN 11272024 - Public
29 nov 2024 — Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilat-.
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DocumentDocumentInstaller's Guide Down Discharge Economizer and Rain Hood Model: BAYECON107A BAYECON108A BAYRLAY006B Used with: *DCZ, *WCZ, *YCZ *018-036 *DCZ, *WCZ, *YCZ *042-060 (Relay required in *WC* Units) Note: "Graphics in this document are for representation only. Actual model may differ in appearance." Note: * indicates an alphanumeric character. SAFETY WARNING Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or altered equipment by an unqualified person could result in death or serious injury. When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that are attached to the equipment. November 2024 18-HE138D1-1A-EN INSTALLER'S GUIDE WARNING: HAZARDOUS VOLTAGE - DISCONNECT POWER BEFORE SERVICING ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES IMPORTANT -- This Document is customer property and is to remain with this unit. Please return to service information pack upon completion of work. General The economizer is a multi-damper design. It is installed in the return air stream and is connected to the unit low voltage supply through wire leads. The economizer is fully accessible through the Coil access panel. Important: After the Economizer installation you must install an air filter rack ordered separately. Use: BAYFLTR101 for *WCZ, *YCZ, *DCZ *024-036 BAYFLTR201 for *WCZ, *YCZ, *DCZ *042-060. When the economizer is installed in *WCZ and *DCZ models, relay accessory kit BAYRLAY006B is required. Refer to the appropriate hookup diagram, depending on model number of unit to make your relay wiring connections in the Control Box. IMPORTANT: In order to maintain a specific minimum fresh air cfm during each mode of operation, you must order and install a BAYOSAC001 (outside air control) accessory. Identify Economizer Kit Contents Refer to Figures 1 and 2 to identify the kit contents. Install Economizer Kit 1. Remove Power Disconnect and verify that power is off. 2. Remove Access Panels Remove these four (4) access panels (see Figure 3): · Control/Heat access panel · Blower access panel · Coil access panel · Downflow Return Air panel 3. BAYRLAY006B Installation (Required for *WCZ and *DCZ units only, for *YCZ units skip to step 4) 1. Remove wire harness that came attached to the BAYECON Logic Module being installed. IMPORTANT: Do NOT remove the resistors from the Logic Module. Also, Do NOT remove the YL and YL/BK wires connected to SO and + on the Logic Module 2. Locate the ICMC Board in the upper left hand corner of the unit control box and the DFC board in the upper center of the unit control box. See Figure 8. Inspect Contents You must report damage and make claims to the transportation company immediately. Report missing parts to your supplier immediately and replace with authorized parts only. WARNING ELECTRIC SHOCK HAZARD Open and lock out all unit disconnects prior to accessory installation or unit maintenance, to prevent injury or death from electrical shock or contact with moving parts. WARNING SAFETY HAZARD Do not remove end covers from economizer actuator; the spring-return assembly may release and cause personal injury. 3. Using the existing holes in the back of the unit control box, mount the relay bracket assembly using the 2 screws supplied with the BAYRLAY006B Kit. See Figure 8. 4. Route the BAYRLAY006B wire harness attached to the relays to the logic module as shown in Figure 11. 5. Connect the BAYRLAY006B to the economizer Logic Module and make the field connections as shown in the appropriate hookup diagram depending on model number of unit. 4. Install Economizer Assembly NOTE: You must install the filter rack per the instructions provided with the filter rack after you install the economizer. CAUTION Use care when inserting the economizer in the return air compartment, to prevent damaging the foil faced insulation. 1. The economizer ships with the return air damper folded up to allow the assembly to fit through the Coil opening in the side of the unit. Insert the economizer assembly into the unit through the Coil access panel opening. See Figure 4. 2. Swing the return air damper section down so that it rests on the bottom of the unit. The economizer will sit completely over the return air opening in the bottom of the unit. See Figure 5. A gear and (1) E-Clip will be provided with each of the economizers, that will need to be installed after the above process has been completed. 2 INSTALLER'S GUIDE 3. Insert a screw through the pre-punched hole in the side flange of the return air damper and into the mating hole in the economizer assembly and tighten. See Figure 5. 4. Insert 2 screws through the holes in the front face of the unit and into the matching attachment holes in the economizer assembly. See Figure 6. 5. Install Rain Hood Assembly 1. Locate the rainhood assembly, which includes the relief damper and the mist eliminator. The back of the hood side mating flanges need to be gasketed (gaskets included in kit). Loosen the right two (2) screws on the unit's top sealing flange above the economizer. See Figure 7. 2. Slide the top flange of the hood underneath the unit's top sealing flange. Drive two self tapping screws into the keyhole openings on the side flanges of the hood. Tighten the two (2) screws on the top sealing flange and the screws on the hood side flanges. See Figures 7 and 9. 6. Mount Mixed Air Sensor 1. Mount the Mixed Air sensor (with wiring) to the left Blower partition using two sheetmetal screws. See Figure 10. The male tabs on the Yellow and Yellow/Black wires will connect to the Economizer wiring harness in a later step. 2. Enthalpy Sensor If used, install this option at this time per instructions provided in the sensor kit. 7. Route Main Wiring 1. From the Economizer assembly, pass the wire harness through the coil grommet. See Figure 11 (view A). Continue routing the harness behind the Compressor compartment and into the Blower compartment. 2. Continue routing the remaining harness through the grommet in the Control Box partition and into the Control Box. 8. Complete Installation (*WCZ, *DCZ, *YCZ) 1. In the Control Box, locate the ICMC Board in the upper left hand corner of the Control Box. Find the YL/RD and YL wires in the 12 pin connector. Leaving enough length of these wires so that the ends going to the ICMC Board can be stripped, cut these wires in two. Strip the cut end of the wires going to the ICMC Board and connect to economizer wires as per the appropriate hookup diagrams. Cap the ends of the Yellow and Yellow/Red wires not being hooked up. Secure all wires with wire ties so that there is no interference with any moving parts or sharp edges in the unit. CAUTION Be certain to cap the ends of the cut YL/RD and YL wires that are not being connected to an accessory or the unit to reduce the risk of a short. 2. In the Control Box, complete the wiring connections per the appropriate wiring diagram. Note that 2 additional blue wires separate from the harness have been provided for installations in R454b (A2L) models that have a mitigation board. The longer of the 2 blue wires is to be connected to the mitigation board as shown in the wiring diagram and is to be routed to the unit low voltage control box. The shorter blue wire is to be connected to the mitigation board as shown in wiring diagram and is to be routed as needed to connect to the appropriate wires as indicated by the wiring diagram. Secure all wires so that there is no interference with any moving parts and do not come into contact with any sharp edges.. 3. Power the economizer and run the checkout procedure. Make desired adjustments to the controller setting the minimum occupied damper position, the outside air setting (if enthalpy control used). 4. Replace the unit Coil access panel, the Blower access panel, and the Control/Heat access panel. 3 INSTALLER'S GUIDE Installing the BAYECON Gears 1. (1) Gear and (1) E-Clip will be provided. 2. Line up return air blade with the gear as shown on gear install. 3. Once both gear and blade are lined up, install the E-Clip to set them in position. Notes: · BAYECON105A/106A will have one of the RA blade brackets behind the bottom gear. Once economizer is set inside the unit, carefully push the bottom/back side of the economizer to pop the bracket off behind the gear to be able to lay the back of the economizer on your unit. · Make sure you line up the bottom/top hole of the gear to the blade in the damper. · Make sure the top of the brackets on return air blades are facing each other (screw heads facing each other) as shown. Gear Clip Gear Clip BAYECON107A 4 BAYECON108A Mixed Air Sensor INSTALLER'S GUIDE Mixed Air Sensor Economizer Assembly Outside Air Sensor Outside Air Sensor Economizer Assembly Mist Eliminator (Filter) Outside Air Sensor Outside Air Sensor Mist Eliminator (Filter) Rainhood Assembly Figure 1. Economizer Kit Components Rainhood Assembly Figure 2. Economizer Kit Components Top Sealing Flange Horizontal Return Air Panel Down Flow Return Air Panel Coils Access Panel Figure 3. Remove Panels Control Box Access Panel Blower Access Panel 5 INSTALLER'S GUIDE DC, TC, YC, WC Unit Dry bulb outside air temperature sensor Figure 4. Insert Economizer in Shipping Position Insert economizer in folded shipping position Economizer actuator and controller Economizer 2.) Insert Assembly screw 1.) Swing Down Return Air Damper Return Air Damper 3.) Install Gear and E-Cips Figure 5. Swing Down and Set Economizer Return Air Damper 6 Economizer outline P-clamp In parts bag INSTALLER'S GUIDE Economizer and Return Air Damper Install two (2) screws into holes. Leave extended from unit 1/2". Apply gasket between damper assembly and hood. Figure 6. Start Economizer's Front Mounting Screws Unit's top sealing flange Economizer rain hood 1. Loosen the two (2) screws to allow hood to slide under top sealing flange of the unit. 2. Drive six (6) self tapping screws into the keyhole openings on each side of hood flanges. Top flange of hood slides under HVAC unit's top sealing flange HVAC unit's top sealing flange Hood HVAC unit 3. Tighten the two (2) top screws and the two (2) side screws. Figure 7. Mounting Rain Hood Detail 7 INSTALLER'S GUIDE ICMC Board Relays DFC Figure 8. Mount BAYRLAY006B Economizer BAYECON107 BAYECON108 Unit Application Models *WCZ-024, 036 *DCZ-024, 036 *YCZ-024, 036 *WCZ-042, 060 *DCZ-042, 060 *YCZ-042, 060 A 20 1/8" 24 3/8" A Figure 9. Rain Hood, Economizer, and Filter 8 INSTALLER'S GUIDE 1.80" 2.82" See View `A' View `A' Approximate Mounting Dimensions Mount the Mixed Air Sensor to the partition using two (2) sheetmetal screws. See view A for approximate positioning Figure 10. Mount Mixed Air Sensor in Blower Compartment 1.) From economizer assembly, pass wire harness through coil Grommet. See View A. 2.) Continue routing behind compressor compartment and into Blower Compartment. 3.) Pull the two (2) Mixed Air Sensor wires (with female quick connects) from the harness and route down near the Mixed Air Sensor. Connect to sensor pigtail wire leads. 4.) Continue Routing the Remaining Harness Through the Grommet and into the Control Box. Coil Grommet Location of Mixed Air Sensor Figure 11. Main Wire Harness Routing View A Coil Grommet Location 9 Wiring Diagram for Economizer Using a Honeywell W7212 Logic INSTALLER'S GUIDE Figure 12. 5YCZ Economizer Connection Diagram IMPORTANT-Retain this wiring diagram; please return this document to service information pack upon completion of work. 10 Wiring Diagram for Economizer Using a Honeywell W7212 Logic INSTALLER'S GUIDE Figure 13. 5WCZ/DCZ Economizer Connection Diagram IMPORTANT-Retain this wiring diagram; please return this document to service information pack upon completion of work. 11 Wiring Diagram for Economizer Using a Honeywell W7212 Logic ACCESSORY MODELS BAYECON10 7AA BBAAYYEECCOONN120087AAAA BAYECON20 8AA AA INSTALLER'S GUIDE Figure 14. 2/4WCZ/DCZ Economizer Connection Diagram IMPORTANT-Retain this wiring diagram; please return this document to service information pack upon completion of work. 12 Wiring Diagram for Economizer Using a Honeywell W7212 Logic ACCESSORY MODELS BAYECON107A A BBAAYYEECCOONN210087AAA A BAYECON208AA A AA INSTALLER'S GUIDE Figure 15. 2/4YCZ Economizer Connection Diagram IMPORTANT-Retain this wiring diagram; please return this document to service information pack upon completion of work. 13 INSTALLER'S GUIDE Sequence Of Operation NOTE: A (G) signal is required for the economizer to operate. As shipped, the economizer will not operate when there is a signal for Heating Modes utilizing gas heat. Fan Only (G): When the thermostat sends a signal for fan only (G), the economizer will open to the minimum position setting regardless of the outdoor air conditions and the indoor blower will operate at approximately 50% airflow. Heating (W1), (W2), (Y1, Y2 on Heat Pump or Dual Fuel Models): When the thermostat sends a signal for auxiliary heat (G) +(W1) or first stage heat (G) + (Y1,Y2), the economizer will open to the minimum position setting. When the ambient temperature may be below 70o F, the economizer will not fully open to the economizing position, when there is a signal for heat. In order to receive fresh air and open the dampers to the minimum position setting, you must provide a G signal to the unit from the thermostat or comfort control being used. FREE COOLING NOT AVAILABLE: When the outdoor air conditions are not sufficient for "Free Cooling" the Economizer will open to the minimum position setting only and the unit will function. FREE COOLING AVAILABLE: 1st Stage Cooling (Y1) + (O for Heat Pumps and Dual Fuel models): When outdoor air conditions are sufficient for "Free Cooling" and the thermostat sends a signal for 1st stage cooling (G) + (Y1) + (O for Heat Pumps and Dual Fuel models), the economizer will modulate accordingly and the indoor blower will run at approximately 70% airflow. 2nd Stage Cooling (Y1) + (Y2) + (O for Heat Pumps and Dual Fuel models): When outdoor air conditions are sufficient for "Free Cooling" and the thermostat sends a signal for 2nd stage cooling (G) + (Y1) + (Y2) + (O for Heat Pumps and Dual Fuel models), the economizer will modulate accordingly, the compressor will operate on low speed, and the indoor blower will operate at 100% airflow. Unit "OFF" Mode When the economizer is not receiving a 24V signal to the TR terminal, or if power is disconnected to the unit, the dampers will be fully closed to the outside air and fully open to the return air. NOTE: Free Cooling refers to the process of circulating unconditioned outside air, without operating the compressor, to cool the structure. Single enthalpy: The enthalpy changeover set point is set to return the outdoor air damper to minimum position when the enthalpy rises above its set point. The enthalpy set point scale markings, located on W7459, are A,B,C,D; see table for the corresponding control point. The factoryinstalled R4 WHITE 620-ohm jumper must be in place across terminals + and SR. CONTROL CURVE A B C D CONTROL POINT APPROX. F (C) AT 50% RH 73 (23) 70 (21) 67 (19) 63 (17) AIR 3 8 4 0 4 2 4 4 46 85 90 95 100 105 110 (29) (32) (35) (38) (41) (43) 80 (27) 75 (24) RELATIVE HUMIDITY (%) P 3O4UND36DRY PER 3 2 24ENT26HAL 2P8Y--BTU 3 0 2 2 2 0 70 (21) 65 (18) 60 (16) A 55 (13) B 50 (10) C 45 D (7) 40 (4) 35 (2) 100 90 80 70 60 50 40 30 20 10 1 8 1 6 1 4 1 2 DC B A 1 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) APPROXIMATE DRY BULB TEMPERATURE-- F ( C) 1 HIGH LIMIT CURVE FOR W7459D. M11681 Figure 16. Single Enthalpy Changeover Set Point 14 INSTALLER'S GUIDE Table 1. Motor Operation Checkout - W7459 Control Only DRIVE MOTOR OPEN Power to TR and TR1, jumper T and T1 DRIVE MOTOR CLOSED Disconnect jumper at T or T1 and disconnect P or P1, if connected SPRING RETURN Disconnect power at TR and TR1 Table 2. Temp vs. OHM Values for MAS (Mixed Air Sensor) Temp F 33.8 35.6 37.4 39.2 41.0 42.8 44.6 46.4 48.2 50.0 51.8 53.6 55.4 57.2 59.0 60.8 62.6 64.4 66.2 68.0 69.8 71.6 73.4 75.2 77.0 78.8 80.6 82.4 84.2 86.0 87.8 89.6 91.4 93.2 95.0 96.8 98.6 100.4 Temp C 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 R(K OHMS) 9.576 9.092 8.636 8.204 7.796 7.412 7.048 6.705 6.380 6.073 5.782 5.507 5.247 5.000 4.767 4.545 4.335 4.136 3.948 3.769 3.599 3.437 3.284 3.138 3.000 2.869 2.744 2.625 2.512 2.404 2.301 2.204 2.111 2.023 1.938 1.858 1.781 1.708 DC Volts 3.910 3.882 3.894 3.863 3.829 3.790 3.749 3.713 3.674 3.634 3.590 3.550 3.507 3.420 3.373 3.328 3.283 3.239 3.180 3.157 3.118 3.080 3.034 3.007 2.971 2.932 2.896 2.860 2.824 2.787 2.750 2.714 2.676 2.639 2.600 2.561 2.526 2.484 15 INSTALLER'S GUIDE CHECKOUT - For Units with a Honeywell W7212 Control CHECKOUT AND TROUBLESHOOTING Checkout requires a 9V battery, 620 ohm, 1.2K ohm, 5.6K ohm, and 6.8K ohm resistors. Use Table 4 and Fig. 18 for checkout. CAUTION Equipment Damage Hazard. Excessive force can damage potentiometer controls. Use a small screwdriver when adjusting enthalpy changeover and minimum damper position controls. W7212 N1 N EXH Set 2V 10V 1 DC VOLTMETER + S C7400 + P1 P T1 T AQ1 AQ SO+ SO SR+ SR EXH Min Pos Open 2V DCV 2V Free Cool B A DCV Max 10V DCV Set 10V C D 2 620 OHM RESISTOR 1 INSERT DC VOLTMETER BETWEEN AQ AND AQ1 FOR CHECKOUT AND TROUBLESHOOTING. 2 JUMPER USED FOR SINGLE ENTHALPY CONTROL. M20612 Fig. 17. Meter location for checkout and troubleshooting (W7212 shown). Table 3. Checkout for W7212, W7213, W7214 Economizer Connected to Honeywell Actuator Step Checkout Procedure Proper Response 1. CHECKOUT PREPARATION FOR ECONOMIZING ONLY Disconnect power at TR and TR1 Disconnect devices at P and P1 Jumper P to P1 (defaults to on board MIN POS potentiometer). Place 5.6K ohm resistor across T and T1 (Blue sleeve-provides input to economizer that the MAT is between 50-55F). Jumper TR to 1 (call for cooling from the thermostat). W7212 only jumper TR to N (places economizer in occupied mode). If connected, remove C7400 Enthalpy Sensor from terminals SO and +. Connect 1.2K ohm, from 4074EJM Checkout Resistor kit, (purple sleeve) across terminals SO and + (makes OA enthalpy high). All LED are off; Exhaust Fan contacts are open Place 620 ohm resistor (white sleeve) across SR and + (makes return enthalpy lower than OA). Set MIN POS and DCV MAX potentiometers fully CCW. Turn DCV setpoint potentiometer mid position (this sets the DCV ventilation at approximately 1000 ppm). Turn exhaust potentiometer to mid position (motor will be approximately 50% open when the exhaust fan contacts make). Set enthalpy potentiometer to D. W7214 only Jumper TR to O. Apply power (24 Vac) to terminals TR and TR1 16 INSTALLER'S GUIDE Table 3. Checkout for W7212, W7213, W7214 Economizer Connected to Honeywell Actuator (Cont.) Step Checkout Procedure Proper Response 2. DIFFERENTIAL ENTHALPY Execute stop one, Checkout Preparation. Turn DCV MAX to mid position. Place 620 ohm resistor across SO and + (white sleeve resistor makes OA enthalpy low). Place 1.2K ohm resistor across SR and + (purple sleeve resistor makes RA enthalpy high). Free cool LED turn on; motor drives to approximately 45 degrees (half) open. Remove 620 ohm resistor from SO and +. 3. SINGLE ENTHALPY Execute stop one, Checkout Preparation. Free cool LED turn off; motor drives closed Turn DCV MAX to mid position. Set enthalpy potentiometer to A (fully CCW). Free cool LED turns on; motor drives to approximately 45 degrees (half) open. Set enthalpy potentiometer to D or E for W7212C (fully CW). Free cool LED turns off; motor drives closed. 4. DCV AND EXHAUST Execute step one, Checkout Preparation. LED for both DCV and Exhaust should be off. Turn DCV MAX to mid position. Motor drives to mid position, 45 degrees open. Turn MIN POS fully CW. Turn MIN POS and DCV MAX to fully CCW. Turn DCV MAX to mid position. Connect 9V battery positive to AQ and negative to AQ1. Remove jumper from N terminal (economizer goes into not occupied mode). Adjust DCV MAX towards CW. Motor drives fully open. Motor drives closed. LED for both DCV and Exhaust turn on. Actuator drives to 45 degrees open. Motor remains at 45 degrees open. Motor will move to position set by DCV MAX pot. Adjust DCV MAX to fully CCW. Motor will drive closed. Reconnect jumper to N terminal. Adjust DCV MAX and MIN POS pots. Motor will drive to the most open position of the pots. Adjust DCV MAX and MIN POS pots to fully CCW. Remove power from N terminal adjust MIN POS towards CW. Motor should not move. Adjust DCV MAX towards CW. Motor will move to position set by DCV MAX pot. 5. MINIMUM AND MAXIMUM POSITION Execute stop one, Checkout Preparation. Connect 9V battery positive to AQ and negative to AQ1. Adjust DCV MAX potentiometer to mid position. DCV LED turns on. Actuator drives to 45 degrees open. Turn DCV maximum position potentiometer to fully CCW. Actuator drives fully closed. Turn minimum position potentiometer to midpoint. Actuator drives to 45 degrees open. Turn minimum position potentiometer fully CW. Actuator drives fully open. Turn MIN POS to fully CCW. Actuator drives fully closed. W7212: Remove jumper from TR and N. W7214: Jumper TR to O. Actuator drives fully closed. 6. MIXED AIR INPUT Execute stop one, Checkout Preparation. Turn DCV MAX to mid position; set enthalpy potentiometer to A. Free cool LED turns on. Actuator drives to 45 degrees open. Remove 5.6K ohm resistor (green sleeve) and place jumper from T and T1. Actuator drives to 45 degrees open. Remove jumper from T and T1 and leave open. Actuator drives fully closed. 17 INSTALLER'S GUIDE Troubleshooting - No Minimum Fresh Air Minimum Fresh Air Damper will not open Locate Minimum Position Potentiometer on Logic Module 24 volts Check for 24 volts across TR and TR1 terminals on Logic Module. No voltage Is 24V present to Green "G" lead at connection in unit? Yes Gently rotate potentiometer fully clockwise. No "G" must have 24V applied to energize the minimum position damper Does Actuator begin to rotate linkage arm? Adjust linkage to Yes properly drive dampers. Remove R3 resistor located across P and P1 terminals on logic module. Open Is resistor "open" or 130 ohms? 130 ohms Replace resistor with 130 ohms 1 watt resistor Replace Actuator and logic module Is the economizer's Black wire No connected to "G"? Black wire must be Yes connected to "G" lead in unit. Is the economizer's Black wire connected to TR at econ? Yes No Black wire must be connected to "TR" terminal at econ. Is BL at TR1 connected to BL at unit's low voltage connection No Blue wire from TR1 must be connected to "BL" lead in unit. You now should have 24V between TR and TR1 at the econ logic module 18 INSTALLER'S GUIDE Troubleshooting - Unit Will Not Economize Dampers will not open beyond minimum position during 1st stage cooling. Jumper across the OAS terminals to No close circuit Is OAS closed? Yes Is OD ambient below 70F? Ambient must be below 70F to activate No economizer beyond minimum position fresh air opening. Does economizer now operate? No Yes Replace OAS Is 24V present between terminals "1" and No "TR1" Yes Remove OAS wire from "S0" and "+" terminals Yes on the Logic module Ensure wires from "1" and "TR1" are correctly wired to unit's low voltage leads. Wires are correctly No applied? Correct wiring. Measure resistance across wire leads Is resistance 620 ohms? Yes Remove wires from "T" and "T1" What is resistance of MAS No Replace the 620 ohm 1 watt resistor. 2-4 ohms Replace Actuator and Logic Module Replace MAS 19 INSTALLER'S GUIDE Troubleshooting - 2nd Stage Inoperable Compressor will not energize when space conditions rise. Install a 2 stage thermostat and Is a 2-stage wire according to economizer No thermostat Installer's Guide applied? Is thermostat's Y2 connected to unit's YL No Wire per Installer's Guide. Yes Troubleshoot unit. Problem is not in economizer. Yes Is 24V present at YL Troubleshoot why No thermostat is not calling for 2nd stage. 20 INSTALLER'S GUIDE Troubleshooting - Dampers Open With G Dampers drive to 100% open during a "Continuous Fan" call. (drives beyond minimum position setting) Ensure there is not a call for cooling. Rotate Minimum Position potentiometer fully CCW Measure resistance of green resistor No across "P" and "P1" terminals. Does damper begin to close? Yes Adjust Minimum Position to desired setting. What is the resistance? Less than 130 ohms Replace resistor with 130 ohm 1 watt resistor 130 ohms or greater Replace Logic Module 21 INSTALLER'S GUIDE Troubleshooting - Mixed Air Sensor Dampers drive to 100% open although the mixed air temp is below 55F. Remove MAS wires from "T" and "T1" terminals on logic module. It can be possible for the tip of the MAS to twist near the thermistor which causes the leads to short and indicate a low resistance reading Resistance should match table in Installer's Guide. Greater than 3.5 ohms What is resistance of MAS? Less than 3.5 ohms Repair or replace MAS 22 INSTALLER'S GUIDE Troubleshooting - Logic Module Failures Logic Module has repeated failures Remove MAS wires from "T" and "T1" terminals on logic module. Measure resistance from either MAS wire to cabinet ground Check other terminals for shorting. No any continuity? Yes Replace MAS 23 About Trane and American Standard Heating and Air Conditioning Trane and American Standard create comfortable, energy efficient indoor environments for residential applications. For more information, please visit www.trane.com or www.americanstandardair.com The manufacturer has a policy of continuous data improvement and it reserves the right to change design and specifications without notice. We are committed to using environmentally conscious print practices. 18-HE138D1-1A-EN 29 Nov 2024 Supersedes (New) © 2024