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- Page 1 Installation Manual: JHC Premium Variable Speed ECM Single Piece Multi- position Air Handlers York International Corp. 5005 York Drive 6412658-UIM-B-0824 Norman, OK 73069 Supersedes: 6412658-UIM-A-0524 www.johnsoncontrols.com Rev B 2024-08-02 Johnson Controls Ducted Systems...
- Page 2 Installation Manual: JHC Premium Variable Speed ECM Single Piece Multi-position Air Handlers Johnson Controls Ducted Systems...
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Page 3: Table Of Contents
Contents About this unit..............................7 Certification...............................7 DS Solutions App.............................. 7 Safety................................. 7 Understanding safety symbols and instructions................7 Safety requirements..........................8 A2L refrigerant safety considerations....................11 General................................ 12 Room size requirements........................... 12 Mechanical ventilation..........................14 Refrigerant equipment checks......................... 15 Electrical devices checks..........................15 Detection of refrigerant.......................... - Page 4 Connecting the wiring........................... 40 Connecting the power line......................... 40 Connecting the low-voltage wiring....................41 Connecting the low-voltage transformer....................43 Using a single-stage thermostat......................43 Connecting conventional controls......................43 Connecting communicating controls...................... 52 Connecting a float switch for communicating systems................ 53 Setting up the controls..........................55 Understanding the unit control board....................56 Checking the unit model configuration....................
- Page 5 Maintenance..............................83 Coil cleaning............................83 Lubrication............................83 Condensate drains..........................83 Wiring diagrams............................. 84 Start-up sheet..............................85 Installation Manual: JHC Premium Variable Speed ECM Single Piece Multi-position Air Handlers Johnson Controls Ducted Systems...
- Page 6 Installation Manual: JHC Premium Variable Speed ECM Single Piece Multi-position Air Handlers Johnson Controls Ducted Systems...
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Page 7: About This Unit
About this unit This single-piece air handler series provides the flexibility for installation in any position. The JHC unit can be used for upflow, downflow, horizontal right, or horizontal left applications. These units can be located in a closet, utility room, attic, crawl space, or basement. These versatile models may be used for cooling or heat pump operation with or without electric heat. -
Page 8: Safety Requirements
DANGER indicates an imminently hazardous situation, which, if not avoided, will result in death or serious injury. WARNING indicates a potentially hazardous situation, which, if not avoided, could result in death or serious injury. CAUTION indicates a potentially hazardous situation, which, if not avoided may result in minor or moderate injury. - Page 9 WARNING Improper installation, adjustment, alteration, or maintenance may create a condition where the operation of the product could cause personal injury or property damage. Refer to this manual for assistance, or for additional information, consult a qualified contractor, installer, or service agency. CAUTION This product must be installed in strict compliance with the installation instructions and any applicable local, state, and national codes including, but not limited to building, electrical, and mechanical codes.
- Page 10 CAUTION These air handlers must be transported and handled in an upright, upflow position. Failure to do so may result in unit damage and personal injury. Configuration conversions must be done at the site of installation. • These instructions cover minimum requirements and conform to existing national standards and safety codes.
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Page 11: A2L Refrigerant Safety Considerations
A2L refrigerant safety considerations CAUTION For R454B applications, this unit uses a mildly flammable (A2L) refrigerant. You must read all of this section before installing this unit to ensure safe installation, operation, and servicing of this unit. WARNING Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufacturer. -
Page 12: General
General Table 1: Safety considerations Item Safety consideration number Any appliance containing more than 3.9 lb in a refrigerating circuit must be constructed such that any refrigerant leak cannot stagnate in a way that would create a fire or explosion hazard. Before beginning work on systems containing flammable refrigerants, safety checks are necessary to ensure that the risk of ignition is minimized. - Page 13 Table 2: Minimum room area System charge (lb-oz) Minimum room area Minimum total Minimum system airflow (CFM) conditioned area (ft 4-12 5-12 6-12 7-12 8-12 9-12 10-0 10-4 10-8 10-12 11-0 11-4 11-8 11-12 12-0 12-4 12-8 12-12 13-0 13-4 Installation Manual: JHC Premium Variable Speed ECM Single Piece Multi-position Air Handlers Johnson Controls Ducted Systems...
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Page 14: Mechanical Ventilation
Table 2: Minimum room area System charge (lb-oz) Minimum room area Minimum total Minimum system airflow (CFM) conditioned area (ft 13-8 13-12 14-0 14-4 14-8 14-12 15-0 15-4 15-8 15-12 16-0 16-4 16-8 16-12 17-0 17-4 1005 17-8 1020 Note: •... -
Page 15: Refrigerant Equipment Checks
Refrigerant equipment checks Table 4: Refrigerant equipment checks Item Safety consideration number Where electrical components are being changed, they must be fit for the purpose and to the correct specification. At all times, the manufacturer’s maintenance and service guidelines must be followed. If in doubt, consult the manufacturer’s technical department for assistance. -
Page 16: Detection Of Refrigerant
Detection of refrigerant Table 6: Detection of refrigerant Item Safety consideration number Under no circumstances shall potential sources of ignition be used in the searching for or detection of refrigerant leaks. Do not use a halide torch or any other detector using a naked flame. -
Page 17: Decommissioning
Decommissioning Before you begin: Before attempting the procedure, complete the following: • Ensure that the technician is completely familiar with the equipment and all its detail. • Ensure to safely recover all refrigerants. • Take an oil and refrigerant sample, in case analysis is required before reusing the recovered refrigerant. -
Page 18: Wiring Installation
Wiring installation NOTICE Cap unused wiring connections. Field-testing the sensor After wiring and configuring the system, provide a Y call for cooling. Simulate an A2L leak by disconnecting the A2L sensor wire from the control board. After 15 s, verify that the call for the compressor is removed. Verify that the Y/Y2 OUT and Y1 OUT compressor outputs have no voltage, the circulating blower is operating, and that the control displays rC. -
Page 19: Installation Overview
Installation overview Complete all of the stages outlined in Figure 1. You may not need to perform tasks indicated with a dashed outline, depending on the specific installation. Figure 1: Installation overview Installation Manual: JHC Premium Variable Speed ECM Single Piece Multi-position Air Handlers Johnson Controls Ducted Systems... -
Page 20: Preparing For Installation
Preparing for installation Complete the necessary preparation before you begin the installation: 1. Inspect the unit for possible damage in transit. 2. Select a suitable location if it is not already predetermined. Take into consideration factors such as structural support, space for service access, and operating sound levels. 3. -
Page 21: Providing The Required Clearances
NOTICE The primary and secondary drain lines must be trapped to allow adequate drainage of condensate water. The secondary drain line must be piped to a location that gives the occupant a visual warning that the primary drain is clogged. If the secondary drain line is not used, it must be capped. -
Page 22: Performing A Pressure Check
Performing a pressure check About this task: It is important to perform a pressure check before you begin installing the unit. Figure 2: Pressure check Depress the Schrader valve core one time to check for pressure. Understanding installation and operation limitations Adhere to the following: •... -
Page 23: Becoming Familiar With The Unit Components
Air handler voltage Normal operating voltage range 208/230-1-60 187 V to 253 V Rated in accordance with ARI Standard 110, utilization range A Becoming familiar with the unit components Make sure that you are familiar with the unit components before you begin the installation. See Figure Figure 3: Return air duct attachment and component location Becoming familiar with the unit dimensions... -
Page 24: Installing An Electric Heat Kit
Figure 4: Dimensions and duct connection dimensions Table 7: Dimensions Models Dimensions Wiring knockouts Refrigerant connections (actual conduit size) line size Height Width Opening widths (in.) Power (in.) Control (in.) Liquid (in.) Vapor (in.) (in.) (in.) JHC18B5AB2SS 45 5/8 17 1/2 7 1/2 16 1/2 16 1/2... - Page 25 NOTICE In some horizontal applications, the service disconnects on the electric heat kits must be rotated 180° so the up position of the disconnect is the ON position. This service disconnect orientation change is required by UL 60335-2-40 (in reference to all circuit breakers). For all other applications, the kits can be installed without modification.
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Page 26: Installing The Unit
Installing the unit NOTICE Do not handle aluminum coil components after handling the copper refrigeration piping or other tubing without first cleaning your hands. To install the unit correctly, you must do the following: 1. Design and install the ductwork if required. 2. -
Page 27: Designing And Installing The Ductwork
Designing and installing the ductwork About this task: Air supply and return may be handled in one of several ways best suited to the installation. Upflow, horizontal, or downflow applications may be used. The vast majority of problems encountered with heating and cooling systems can be linked to incorrectly designed or installed duct systems. It is therefore highly important to the success of an installation that the duct system be correctly designed and installed. -
Page 28: Converting The Unit For Downflow Or Horizontal Right Use
Figure 5: Configuration options If you require either a downflow or horizontal right airflow configuration, you must reposition the coil assembly. See Converting the unit for downflow or horizontal right use. Converting the unit for downflow or horizontal right use About this task: NOTICE Convert the air handler to the required orientation before installation. -
Page 29: Installing A Horizontal Baffle Plate
Route the A2L refrigerant sensor wire out of the coil compartment by passing through the opening for it in the tubing access panel. See Figure 12. Install the included grommet to protect the sensor wire. Route the sensor wire into the air handler cabinet low voltage wiring opening and back into the control box. - Page 30 CAUTION Do not lift the air handler by the cabinet braces. The cabinet braces could become disengaged from the cabinet causing the air handler to fall, potentially causing injury or damaging property. See Figure 3 the location of the cabinet braces. Lift the air handler by tightly gripping the casing. NOTICE When assembling the support structure, size to provide clearance for access door removal.
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Page 31: Using The Duct Flanges
Figure 7: Suspension support locations for horizontal applications Using the duct flanges To use the duct flanges that are integrated into the casing, do the following: 1. Fold the flanges open into position. 2. Anchor the flanges with screws. Installation Manual: JHC Premium Variable Speed ECM Single Piece Multi-position Air Handlers Johnson Controls Ducted Systems... -
Page 32: Connecting The Unit To The Ductwork
Figure 8: Duct attachment Connecting the unit to the ductwork About this task: There are several ways to handle the supply and return air duct connections. The location and sizing of the connections depends on the situation and the method best suited to the installation. Upflow, horizontal, or downflow applications may be used. -
Page 33: Installing The Air Filters
Installing the air filters About this task: CAUTION Never operate the equipment without filters. You must install return air filters. Filters are field supplied and filtration must be accomplished external to the unit. To install air filters, do the following: •... -
Page 34: Connecting The Condensate Drain Lines
Connecting the condensate drain lines Before you begin: Adhere to the following when connecting the condensate drain lines: • Pitch all drain lines 1/4 in./ft away from the unit drain pan and ensure that the drain lines are no smaller than the coil drain connection. •... - Page 35 Figure 10: Location of coil trapped and plugged drain connections Figure 11: Drain traps What to do next: Install the refrigerant piping. Installation Manual: JHC Premium Variable Speed ECM Single Piece Multi-position Air Handlers Johnson Controls Ducted Systems...
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Page 36: Installing The Refrigerant Piping
Installing the refrigerant piping Perform the following steps to install the refrigerant piping: 1. Prepare the connect the refrigerant lines. 2. Choose either to braze the refrigerant lines or to use braze-free connections. 3. Check for leaks, then evacuate and charge the system. 4. - Page 37 CAUTION Dry nitrogen should always be supplied through the tubing while it is being brazed, because the temperature required is high enough to cause oxidation of the copper unless an inert atmosphere is provided. The flow of dry nitrogen should continue until the joint has cooled. Always use a pressure regulator and safety valve to ensure that only low pressure dry nitrogen is introduced into the tubing.
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Page 38: Using Braze-Free Refrigerant Line Connections
Figure 12: Vapor line grommet What to do next: Check for leaks, evacuate, and charge the unit. Using braze-free refrigerant line connections About this task: The following steps explain how to use braze-free refrigerant line connections. For brazed connections, see Brazing the refrigerant lines. -
Page 39: Checking For Leaks, Evacuating, And Charging The Unit
Checking for leaks, evacuating, and charging the unit Refer to the Installation Manual for the outdoor unit and complete the leak check, evacuation, and charging according to the instructions provided. Check all field-brazed joints and metering device connections. Completing the refrigerant piping Before you begin: Make sure that you have connected the refrigerant lines using the brazing or non-braze method before you complete the final refrigerant piping installation steps. -
Page 40: Connecting The Wiring
Connecting the wiring Wiring diagrams for relevant wiring diagrams. NOTICE All wiring must comply with local and national electrical code requirements. Read and heed all unit caution labels. To connect the wiring correctly, you must do the following: 1. Connect the power line. 2. -
Page 41: Connecting The Low-Voltage Wiring
Figure 13: Line power connections To connect the power line, do the following: Figure Bring power into the unit through the supply air end of the unit (top left when unit is vertical) or the left side panel. Use the hole appropriate to the unit’s orientation in each installation to bring the conduit from the disconnect. - Page 42 Important: Refer to the installation instructions for the electric heat kit for additional information about connecting the wiring for the electric heat kit as needed. To connect the low-voltage wiring, do the following: Table 8 to familiarize yourself with the low-voltage connections. Table 8: Low-voltage connections Wire Colors...
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Page 43: Connecting The Low-Voltage Transformer
Connecting the low-voltage transformer About this task: The 24 V power supply is provided by an internally wired low-voltage transformer that is standard on all models. NOTICE All wiring must comply with local and national electrical code requirements. Read and heed all unit caution labels. - Page 44 Figure 14: Control wiring - variable ECM air handler - electric heat only - conventional wiring • Use the HUM OUT output to control a humidifier if required. Figure 15: Control wiring - premium ECM air handler and HH8 heat pump - conventional wiring NOTICE Room thermostat reversing valve operation must be set to "O"...
- Page 45 Figure 16: Control wiring - premium ECM air handler and premium multi-stage air conditioner - conventional wiring demand response NOTICE Y2 OUT on premium multi-stage air conditioners is an output for a high speed indoor blower. This connection is required only if using the demand response feature built into the outdoor unit control board.
- Page 46 Figure 17: Control wiring - premium ECM air handler and premium multi-stage air conditioner - conventional wiring NOTICE Y2 OUT on the outdoor unit control board is not used unless the demand response feature is used. See alternate wiring diagram for details. *HUMIDISTAT is optional Installation Manual: JHC Premium Variable Speed ECM Single Piece Multi-position Air Handlers Johnson Controls Ducted Systems...
- Page 47 Figure 18: Control wiring - premium ECM air handler and premium multi-stage heat pump - conventional wiring NOTICE Room thermostat reversing valve operation must be set to "O" - energize during cooling operation. Y2 OUT on a multi-stage heat pump is an output for a high-speed indoor blower. This connection is required.
- Page 48 Figure 19: Control wiring - premium ECM air handler and standard multi-stage air conditioner - conventional wiring NOTICE *HUMIDISTAT is optional Installation Manual: JHC Premium Variable Speed ECM Single Piece Multi-position Air Handlers Johnson Controls Ducted Systems...
- Page 49 Figure 20: Control wiring - premium ECM air handler and standard multi-stage heat pump - conventional wiring NOTICE Room thermostat reversing valve operation must be set to "O" - energize during cooling operation. Y2 OUT on a multi-stage heat pump is an output for a high speed indoor blower. This connection is required.
- Page 50 Figure 21: Control wiring - premium ECM air handler and standard single-stage air conditioner - conventional wiring NOTICE *HUMIDISTAT is optional Installation Manual: JHC Premium Variable Speed ECM Single Piece Multi-position Air Handlers Johnson Controls Ducted Systems...
- Page 51 Figure 22: Control wiring - premium ECM air handler and standard single-stage heat pump - conventional wiring NOTICE Room thermostat reversing valve operation must be set to "O" - energize during cooling operation. Do not bond any of the outdoor unit "W" wires together. *HUMIDISTAT is optional Installation Manual: JHC Premium Variable Speed ECM Single Piece Multi-position Air Handlers Johnson Controls Ducted Systems...
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Page 52: Connecting Communicating Controls
Connecting communicating controls About this task: This section applies only for communicating systems. Important: • If you are using a communicating system, you must use the Hx 3 Touch Screen Thermostat (S1-THXU430W). • If you are using a fully communicating system with an outdoor unit containing A2L refrigerants, a refrigerant detection system (RDS) is required. -
Page 53: Connecting A Float Switch For Communicating Systems
Figure 23: Control wiring - communicating indoor - communicating outdoor - communicating wiring Important: Do not place more than one wire under any single communication terminal screw (there are four communication terminal screws). If more than one wire must be connected to a terminal screw, attach only the terminal end of a one wire pigtail and use a wire connector to connect the other end of the pigtail to the other wires. - Page 54 CAUTION Failure to test condensate overflow detection equipment could lead to equipment failure and damage. Important: • To enable the float switch feature, in the system settings for the Hx 3 Touch Screen Thermostat, you must change the default setting of disabled for the float switch. If using a normally closed switch, choose Enabled (Open).
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Page 55: Setting Up The Controls
Setting up the controls Important: You must set up the controls correctly at the time of installation to ensure correct system operation. STOP and read all of the information and tasks relating to control board setup included in this manual before you start to set up the controls. This is because it is vital to understand all aspects of setting up the controls before you make any changes to DIP switch settings. -
Page 56: Understanding The Unit Control Board
Understanding the unit control board It is important to become familiar with how the air handler control board works before you set up the controls. See Figure 25 for an illustration of the control board. Figure 25: JHC control board The control board in JHC air handlers contains a variety of new features including two 7-segment LED displays that can be used to aid in unit setup, unit diagnostics, and viewing the unit mode or status. - Page 57 The control board can interface with the following: • Conventional room thermostat • Hx 3 Touch Screen Thermostat (S1-THXU430W), which is a communicating room thermostat. You can use Hx 3 Touch Screen Thermostats in an air handler only application or with a fully communicating outdoor unit.
- Page 58 • When you change the model configuration and aux heat configuration DIP switch settings in the SW2 or SW3 switch banks, the control board displays a fault until you press and hold the push button on the control board for 6 s to 9 s to reset the control board. When you change the airflow configuration or settings configuration DIP switch settings in the SW4 or SW5 switch banks, the control board does not display a fault, so you do not need to press and hold the push button to reset the control board.
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Page 59: Checking The Unit Model Configuration
Checking the unit model configuration About this task: The six model configuration DIP switches in the SW2 switch bank in quadrant A come factory set in the 0 or off position. The air handler model ID is programmed into the control board at the factory. Table 9 shows the model ID for each JHC air handler. -
Page 60: Configuring The Electric Heat Kit
• Be aware that when you change the DIP switch settings in the SW2 switch bank, the control board displays a fault until you press and hold the push button on the control board for 6s to 9s to reset the control board. To set the unit model, do the following: Make sure that power is applied to the air handler and the air handler is in standby mode. - Page 61 If you are using a conventional system and an electric heat kit is installed, you must set aux heat configuration DIP switches 3, 4, 5, and 6 in the SW3 switch bank in quadrant B to select the specific electric heat kit model. See Table 18 Table 19 for the DIP switch settings for single-phase and...
- Page 62 For heat pump applications, it is best practice to use only the least amount of electric heat necessary to correctly temper the indoor air during unit defrost. Heat pumps energize W1 on the air handler control board only during defrost. For a system combination that uses a JHC36B air handler, a 15 kW electric heat kit, and a 3-ton heat pump, for example, you would need to change the stage settings for the electric heat kit.
- Page 63 If you are using a multi-stage electric heat kit and you need to reconfigure the stage settings for the electric heat kit, see the Aux heat configuration DIP switch settings section. Then, in the SW3 switch bank in quadrant B, set AUX HEAT CONFIGURATION DIP switches 1 and 2 for stage as required.
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Page 64: Setting The Dip Switch For The Humidistat
Setting the DIP switch for the humidistat About this task: This task applies only for conventional systems. Important: If you are using a communicating system, on the Hx 3 Touch Screen Thermostat, to enable the dehumidification feature, choose dehumidify with equipment in the service menu dehumidification setting. -
Page 65: Setting The Dip Switches For Stage Delay
Setting the DIP switches for stage delay About this task: This task applies only for conventional systems. Important: If you are using a communicating system, you use the Hx 3 Touch Screen Thermostat to configure stage delay settings. For conventional systems, if you are using a single-stage thermostat with a multi-stage electric heat kit, you must adjust the stage delay settings to allow a W2 electric heat kit output when a W1 input is present after a 10 min, 15 min, or 20 min delay. -
Page 66: Configuring Low-Speed And High-Speed Airflow
Figure 29: DIP-10 Inputs to the air handler control board pass to the motor, which determines the target CFM to deliver. NOTICE Incorrect airflow and comfort settings may result in decreased system efficiency and performance. These variable speed air handlers are designed to deliver constant airflow (CFM) regardless of the external static pressure (ESP) in the ductwork. -
Page 67: Configuring Comfort Settings
To configure low-speed and high-speed airflow, do the following: Make sure that power is applied to the air handler and the air handler is in standby mode. Refer to the outdoor unit Technical Guide and use to check the appropriate system airflow for the specific air handler model and outdoor unit. -
Page 68: Configuring Continuous Fan Airflow
Important: There must be no active thermostat calls (inputs) during control board setup. If there is an active call when you are making changes to DIP switch settings, the change does not save. To configure comfort settings, do the following: Make sure that power is applied to the air handler and the air handler is in standby mode. -
Page 69: Adjusting The Air System
Adjusting the air system About this task: You must adjust the air system to keep the CFM within the airflow limitations of the indoor coil if needed. To check the cubic feet per minute (CFM), measure the external duct static pressure using a manometer and static pressure tips. -
Page 70: Unit Data
Unit data See the following tables for physical, electrical and airflow data for the JHC unit. Combustible floor base accessory Table 15 Figure 31 for information about floor base models. Table 15: Floor base models Floor base models Used with Dimensions 1FB1917 JHC18B5AB, JHC24B5AC, JHC36B5AD,... -
Page 71: Electrical Data Cooling Only
Table 16: Physical and electrical data cooling only Models JHC18B5*B JHC24B5*C JHC36B5*D JHC36C5*D JHC42C5*F JHC42D5*F JHC48C5*G JHC48D5*G JHC60C5*H JHC60D5*H JHC60D5*J Filter Type Disposable or cleanable Size 16 x 20 x 1 16 x 20 x 1 16 x 20 x 1 20 x 20 x 1 20 x 20 x 1 23 x 20 x 1... -
Page 72: Electrical Heat - Minimum Fan Cfm For Three-Phase Heat Kits
• For minimum CFM, if there are no values present, the first value is low-stage CFM (W1) and the second value is full stage CFM (W1+W2). If higher kW/CFM is needed for low-stage, refer to Table • To increase airflow by approximately 20%, adjust airflow configuration DIP switches 1 and 2 for heat from 00 to 01. -
Page 73: Electric Heat Performance Data For Single-Phase And Three-Phase
Table 22: kW and MBH conversions for total power input requirement Distribution power Nominal voltage Conversion factor 208V 240V 0.75 220V 240V 0.84 230V 240V 0.92 Electric heat performance data for single-phase and three- phase Table 23: Electric heat performance data for single-phase and three-phase Heater models Nominal kW at Total heat... - Page 74 Table 24: Electrical data for single source power supply: single-phase Air handler models Heater models Heater amps at 240 V Field wiring Minimum circuit ampacity 208V 230V 208V 230V JHC42C5*F 8HK(0,1)6500206 17.6 18.7 8HK(0,1)6500506 28.4 30.7 8HK(0,1)6500806 41.6 45.3 8HK(0,1)6501006 50.0 54.6 8HK(1,2)6501506...
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Page 75: Electrical Data For Multi-Source Power Supply: Single-Phase
Electrical data for multi-source power supply: single-phase Table 25: Electrical data for multi-source power supply: single-phase Air handler Heater models Heat amps Minimum circuit ampacity models at 240 V 208V 230V 208V 230V Circuit Circuit JHC24B5*C 8HK16501506 24.7 43.5 — 26.9 48.1 —... -
Page 76: Electrical Data For Multi-Source Power Supply: Three-Phase
Table 26: Electrical data for single source power supply: three-phase Air handler models Heater models Heater amps at 240 V Field wiring Minimum circuit ampacity 208V 230V 208V 230V JHC60D5*H 8HK06501025 23.1 31.7 34.4 8HK06501525 34.6 44.2 48.2 46.2 56.7 62.0 8HK06502025 57.7... -
Page 77: Airflow Data
Airflow data Table 28: Airflow data JHC18 models to JHC42 models JHC18B5*B JHC24B5*C JHC36B5*D JHC36C5*D JHC42C5*F JHC42D5*F switch HI COOL LO HI COOL LO HI COOL LO HI COOL LO HI COOL LO HI COOL LO COOL COOL COOL COOL COOL COOL 1100... -
Page 78: Troubleshooting
Troubleshooting It is important to understand unit status and fault codes and be able to identify wiring-related faults. Status and fault codes The control includes an LED that displays status as well as two 7-segment displays to display fault codes. These codes are shown in Table 30. - Page 79 Table 31: Fault list Fault or status Display 1 Display 2 Simplified Description Internal control fault Control failure The control has failed and must be replaced. Model configuration changed Configuration The model configuration DIP switch settings do not match the stored air faults handler model on the control.
- Page 80 Table 31: Fault list Fault or status Display 1 Display 2 Simplified Description Call for reversing valve while in air conditioner Incorrect wiring The control senses 24 VAC on the O terminal. mode • If the outdoor unit is not a heat pump, make sure that the settings configuration DIP switch for AC/HP operation is set correctly.
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Page 81: Wiring-Related Faults
Table 31: Fault list Fault or status Display 1 Display 2 Simplified Description Fan - high voltage failure Fan faults The control senses the motor is receiving too high voltage. Check the voltage going to the blower motor. Check the wiring of power to the motor. Cycle power to the motor and to the control. -
Page 82: Verifying Txv Installation
Verifying TXV installation Before continuing with the installation, ensure you have verified everything on the following checklist: TXV checklist □ Is the coil metering device installed correctly? □ Is the correct TXV installed according to the Technical Guide or Tabular Data Sheet for the outdoor section? □... -
Page 83: Maintenance
Maintenance Inspect filters at least once per month, and clean or replace them when they become dirty. The frequency of cleaning depends upon the hours of operation and the local atmospheric conditions. Clean filters keep unit efficiency high. Coil cleaning CAUTION Ensure adequate precautions are taken to protect electrical components from liquid. -
Page 84: Wiring Diagrams
Wiring diagrams Figure 32: Wiring diagram - standard single piece multi-position ECM Installation Manual: JHC Premium Variable Speed ECM Single Piece Multi-position Air Handlers Johnson Controls Ducted Systems... -
Page 85: Start-Up Sheet
Third-Party Trademarks Notice: For information about third-party trademarks, refer to the relevant company websites. Start-up sheet Installation Manual: JHC Premium Variable Speed ECM Single Piece Multi-position Air Handlers Johnson Controls Ducted Systems... - Page 86 Subject to change without notice. Published in U.S.A. Copyright © 2024 by Johnson Controls. All rights reserved. Johnson Controls Ducted Systems...
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