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Summary of Contents for York JMC Series
- Page 1 Installation Manual: JMC Series Variable Speed ECM Modular Multi-Position Air Handlers 208/230 V - Single Phase and Three Phase York International Corporation, 5005 York 6412218-UIM-B-0424 Drive, Norman, OK 73069 Supersedes: 6412218-UIM-A-0324 2024-04-25 Johnson Controls Ducted Systems...
- Page 2 Installation Manual: JMC Series Johnson Controls Ducted Systems...
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Page 3: Table Of Contents
Setting the DIP switch for the humidistat..................35 Setting the DIP switch for AC/HP operation..................35 Setting the DIP switches for stage delay..................36 Understanding airflow and comfort settings...................36 Configuring low-speed and high-speed airflow................37 Installation Manual: JMC Series Johnson Controls Ducted Systems... - Page 4 Troubleshooting............................. 48 Status and fault codes.........................48 Wiring-related faults..........................51 Maintenance..............................52 Replacing or cleaning filters.......................52 Cleaning the indoor coil........................52 Checking the condensate drain lines....................52 Third-party trademarks..........................52 Wiring diagrams............................. 53 Start-up sheet..............................55 Installation Manual: JMC Series Johnson Controls Ducted Systems...
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Page 5: About The Jmc Unit
Important indicates information that is essential to complete a task or may result in damage to the device if not followed. Note indicates something of special interest or importance. Notes can contain any type of information except safety information. Installation Manual: JMC Series Johnson Controls Ducted Systems... -
Page 6: Safety Requirements
For minimum airflow (CFM) requirements, refer to the Minimum room area table in the A2L refrigerant safety considerations section of the indoor coil manual. Installation Manual: JMC Series Johnson Controls Ducted Systems... - Page 7 When attaching ductwork with screws, carefully fasten the screws and keep them within 5/8 in. of the sides and back of the air handler. • Install the air handler so the electrical components are protected from water. Installation Manual: JMC Series Johnson Controls Ducted Systems...
- Page 8 These instructions are required as a minimum for a safe installation. • These models are not CSA listed or approved for installation into a HUD-approved modular home or a manufactured (mobile) home. Installation Manual: JMC Series Johnson Controls Ducted Systems...
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Page 9: Installation Overview
Install accessories and configure the unit for the specific application before setting the unit in place, connecting the unit to the ductwork, or connecting any wiring or piping. Figure 1: Installation overview Installation Manual: JMC Series Johnson Controls Ducted Systems... -
Page 10: Preparing For Installation
On these installations, completely seal the unit duct connections and other openings, and use a wrap of 2 in. fiberglass insulation with vinyl vapor barrier. Installation Manual: JMC Series Johnson Controls Ducted Systems... -
Page 11: Providing The Required Clearances
The acceptable voltage range for these units is as follows: 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 Installation Manual: JMC Series Johnson Controls Ducted Systems... -
Page 12: Becoming Familiar With The Unit Dimensions
All dimensions are in inches. Actual size (conduit size). Becoming familiar with the unit components • Make sure that you are familiar with the unit components before you begin the installation. See Figure Installation Manual: JMC Series Johnson Controls Ducted Systems... -
Page 13: Installing An Electric Heat Kit
Install the electric heat kit according to the installation instructions included with the kit. After installing the electric heat kit, mark the air handler nameplate to designate the electric heat kit that is installed. What to do next: Install the unit. Installation Manual: JMC Series Johnson Controls Ducted Systems... -
Page 14: Installing The Unit
This includes the standards of the National Fire Protection Association for Installation of Air- Conditioning and Ventilating Systems, NFPA No. 90B. If using electric heat, you must use non- flammable material. Duct systems must be designed in accordance with ACCA Manual D. Installation Manual: JMC Series Johnson Controls Ducted Systems... -
Page 15: Configuring The Unit
Apply the neoprene foam gasket to the return air end of the air handler. Attach three tie plates to the external sides and back of the air handler casing using screws. Figure Figure 5: Coil and air handler attachment details Installation Manual: JMC Series Johnson Controls Ducted Systems... - Page 16 Apply the foam gasket over the air handler and coil mating seams on the interior of both unit sides and back. See Figure Figure 6: Gasket location Slide the coil into the housing and install the coil access panel and coil filter door. Installation Manual: JMC Series Johnson Controls Ducted Systems...
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Page 17: Suspending The Unit In Horizontal Applications
Attach the threaded rods at the locations shown in Figure 7, leaving enough clearance between the door and the rod so that doors can be easily removed for service. Figure 7: Suspension support locations for horizontal applications Installation Manual: JMC Series Johnson Controls Ducted Systems... -
Page 18: Using The Duct Flanges
If you cannot fabricate the recommended transition, attach a block-off plate approximately 8 in. high and running the full width of the plenum to the supply opening. See Figure 9. Using a block-off plate enables better air circulation across the limit switches. Installation Manual: JMC Series Johnson Controls Ducted Systems... -
Page 19: Installing Air 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: • Secure the air filters in the return air ductwork as required. What to do next: Connect the wiring. Installation Manual: JMC Series Johnson Controls Ducted Systems... -
Page 20: Connecting The Wiring
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. Figure 10 for line power connections. Installation Manual: JMC Series Johnson Controls Ducted Systems... -
Page 21: Connecting The Low-Voltage Wiring
If the air handler has an add-on indoor coil to be paired with an outdoor unit using an A2L refrigerant, you must use a refrigerant detection system (RDS). See the Installation Manual for the RDS or an indoor coil with a factory-installed RDS for low-voltage wiring instructions and diagrams. Installation Manual: JMC Series Johnson Controls Ducted Systems... - Page 22 Connect the communicating components in the communicating system. Follow the procedure in Connecting communicating controls. • Connect a float switch if required. Follow the procedure in Connecting a float switch for communicating systems. Installation Manual: JMC Series Johnson Controls Ducted Systems...
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Page 23: Connecting The Low-Voltage Transformer
S1 logic input: If you are using an HMH7 horizontal discharge heat pump, you must use the S1 logic input. This makes the air handler compatible with the HMH7 horizontal discharge heat pump without the need for any additional relays. Installation Manual: JMC Series Johnson Controls Ducted Systems... - Page 24 If you are using a conventional system with an outdoor unit containing A2L refrigerants, interface the RDS with the conventional system. See the Installation Manual for the RDS or an indoor coil with a factory-installed RDS for low-voltage wiring instructions and diagrams. Installation Manual: JMC Series Johnson Controls Ducted Systems...
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Page 25: Connecting Communicating Controls
B- terminals are connected together, all of the C terminals are connected together, and all of the R terminals are connected together. See Figure Figure Installation Manual: JMC Series Johnson Controls Ducted Systems... - Page 26 Connect a plenum air temperature sensor (thermistor) to the LEAVING AIR TEMP SENSOR • terminals on the control board if required. • Supply 24 VAC to the conventional O input if air circulation during communicating operation is required. Installation Manual: JMC Series Johnson Controls Ducted Systems...
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Page 27: Connecting A Float Switch For Communicating Systems
SW5 switch bank. To connect a float switch, do the following: • Connect a float switch to the FLOAT SWITCH INPUT terminals on the control board. What to do next: Set up the controls. Installation Manual: JMC Series Johnson Controls Ducted Systems... -
Page 28: Setting Up The Controls
HMH7 horizontal discharge heat pump. S1 mode does not apply for communicating systems. 9. For conventional or communicating systems, wire the thermostat to the control board. Installation Manual: JMC Series Johnson Controls Ducted Systems... -
Page 29: Understanding The Unit Control Board
Hx 3 Touch Screen Thermostat. The float switch input is ignored unless you activate it during installer setup of the Hx 3 Touch Screen Thermostat. The air handler can use either a normally open or normally closed float switch, selectable during installer setup. Installation Manual: JMC Series Johnson Controls Ducted Systems... - Page 30 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. Installation Manual: JMC Series Johnson Controls Ducted Systems...
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Page 31: Checking The Unit Model Configuration
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. Installation Manual: JMC Series Johnson Controls Ducted Systems... -
Page 32: Configuring The Electric Heat Kit
W1 and W2. Five of the electric heat kits in the 8HK series are multi-stage electric heat kits. Table 4 shows the amount of heat per stage for these multi- stage electric heat kits. Installation Manual: JMC Series Johnson Controls Ducted Systems... - Page 33 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. Installation Manual: JMC Series Johnson Controls Ducted Systems...
- Page 34 If you need to reconfigure the airflow for the electric heat kit, see Table 11 Table 12. Then, in the SW4 switch bank in quadrant C, set AIRFLOW CONFIGURATION DIP switches 1 and 2 for heat as required. Installation Manual: JMC Series Johnson Controls Ducted Systems...
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Page 35: Setting The Dip Switch For The Humidistat
HP operation as required for the type of outdoor unit being used: Set the DIP switch to the on position for an air conditioner. Set the DIP switch to the off position for a heat pump. Installation Manual: JMC Series Johnson Controls Ducted Systems... -
Page 36: Setting The Dip Switches For Stage Delay
D. See Configuring continuous fan airflow. Figure 18 for an example of airflow configuration DIP switch settings. 0 indicates the off position and 1 indicates the on position. Figure 18: DIP-10 Installation Manual: JMC Series Johnson Controls Ducted Systems... -
Page 37: Configuring Low-Speed And High-Speed 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. Installation Manual: JMC Series Johnson Controls Ducted Systems... -
Page 38: Configuring Comfort Settings
DIP switch settings for each comfort setting. Table 7: DIP switch settings for comfort settings Delay tap Comfort setting A = 00 Normal B = 01 Humid C = 10 D = 11 Temperate Installation Manual: JMC Series Johnson Controls Ducted Systems... -
Page 39: Configuring Continuous Fan Airflow
Check the DIP switch settings for the required continuous fan setting in Table 8. Then, in the SW5 switch bank in quadrant D, set SETTINGS CONFIGURATION DIP switches 2 and 3 for continuous fan airflow accordingly. Installation Manual: JMC Series Johnson Controls Ducted Systems... -
Page 40: Enabling S1 Mode For Use With An Hmh7 Horizontal Discharge Heat Pump
Configuring low-speed and high-speed airflow Configuring comfort settings Configuring continuous fan airflow Apply power to the air handler and confirm that the air handler goes into standby mode. Remove power from air handler. Installation Manual: JMC Series Johnson Controls Ducted Systems... -
Page 41: Wiring The Thermostat To The Control Board
If you are using a conventional thermostat, wire the field thermostat wires to the factory- supplied low-voltage leads in the low-voltage compartment. What to do next: Adjust the air system. Installation Manual: JMC Series Johnson Controls Ducted Systems... -
Page 42: Adjusting The Air System
Treat the negative number as a positive, and add the two numbers together to determine the total external system static pressure. Table 23 to determine the airflow and make the necessary adjustments to keep the CFM within the airflow limitations of the coil. Installation Manual: JMC Series Johnson Controls Ducted Systems... -
Page 43: Unit Data
(0,1) - 0 = no service disconnect or 1 = with service disconnect (1,2) - 1 = with service disconnect, no breaker jumper bar or 2 = with service disconnect and breaker jumper bar Installation Manual: JMC Series Johnson Controls Ducted Systems... - Page 44 (0,1) - 0 = no service disconnect or 1 = with service disconnect (1,2) - 1 = with service disconnect, no breaker jumper bar or 2 = with service disconnect and breaker jumper bar For different power distributions, see Table Installation Manual: JMC Series Johnson Controls Ducted Systems...
- Page 45 MOP = Maximum Overcurrent Protection device; must be HACR type circuit breaker or time delay fuse. The first circuit includes blower motor amps. Refer to the latest edition of the National Electric Code or in Canada the Canadian electrical Code and local codes to determine correct wire sizing. Installation Manual: JMC Series Johnson Controls Ducted Systems...
- Page 46 MOP = Maximum overcurrent protection device; must be HACR type circuit breaker or time delay fuse. The first circuit includes blower motor amps. Refer to the latest edition of the National Electric Code or in Canada the Canadian electrical Code and local codes to determine correct wire sizing. Installation Manual: JMC Series Johnson Controls Ducted Systems...
- Page 47 • The airflow (CFM) indicator flashes once for every 100 CFM, for example, 12 flashes is 1200 CFM. Flashes are approximately ±10% of actual CFM. Installation Manual: JMC Series Johnson Controls Ducted Systems...
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Page 48: Troubleshooting
Any fault or event code that would prevent the equipment from running Table 25 – – No fault codes in memory 2 flashes – – Fault code memory cleared 3 flashes – – Installation Manual: JMC Series Johnson Controls Ducted Systems... - Page 49 The control energizes the indoor blower in high heat speed and de-energizes any electric heat signal. The control returns to normal operation when the RDS no longer senses a refrigerant leak. Installation Manual: JMC Series Johnson Controls Ducted Systems...
- Page 50 The control senses the motor is not moving with an active demand. Check the motor has sufficient power. Check the wiring between the motor and the control. Verify nothing is blocking the blower fan. Cycle power to both the motor and the control. Installation Manual: JMC Series Johnson Controls Ducted Systems...
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Page 51: Wiring-Related Faults
Wiring-related faults If the control receives a simultaneous call for electric heating and cooling (fault code 24), the control locks out and does not condition. See Status and fault codes for troubleshooting guidance. Installation Manual: JMC Series Johnson Controls Ducted Systems... -
Page 52: Maintenance
If condensate ever flows from the secondary drain, shut off the unit immediately and clean the condensate pan and drains to ensure a free flowing primary drain. Third-party trademarks Third-Party Trademarks Notice: For information about third-party trademarks, refer to the relevant company websites. Installation Manual: JMC Series Johnson Controls Ducted Systems... -
Page 53: Wiring Diagrams
Wiring diagrams Figure 22: Wiring diagram: standard ECM single phase heat kits Installation Manual: JMC Series Johnson Controls Ducted Systems... - Page 54 Figure 23: Wiring diagram: 208/230V three-phase heat kits Installation Manual: JMC Series Johnson Controls Ducted Systems...
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Page 55: Start-Up Sheet
Start-up sheet Installation Manual: JMC Series Johnson Controls Ducted Systems... - Page 56 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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