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Installation & Operation Manual
11 EER Vertical Wall-Mount Air Conditioners
EAH1020A-EAH1060A & EGH1072A
(Single Stage)
EAH2024A-EAH2060A & EGH2072A
This manual may include information for options and features which may not be
included on the unit being installed. Refer to the unit data label or Model Identification
to determine which features and options this unit is equipped with.
INSTALLER: Affix the instructions on the inside of the building adjacent to the thermostat.
END USER: Retain this manual for future reference.
P.O. Box 400 • Cordele, Georgia 31010 • 156 Seedling Drive • Cordele, Georgia 31015
E-mail: eubanksales@airxcs.com • Internet: www.EubankWallMount.com
The most current version of this manual can be found at www.EubankWallMount.com.
MODELS:
(2-Stage)
IMPORTANT
Manufactured By:
Eubank, An AirX Climate Solutions Brand
(229) 273-3636 • Fax (229) 273-5154
Air Conditioner Product Manual
Vertical Wall-Mount Air Conditioners
with Front Control Box Panel
Eubank EAH/EGH Wall Mount AC Installation & Operation Manual
05/2025 Rev.4
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Table of Contents
Troubleshooting
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Summary of Contents for ACS Eubank EAH1020A
- Page 1 Air Conditioner Product Manual Vertical Wall-Mount Air Conditioners with Front Control Box Panel Installation & Operation Manual 11 EER Vertical Wall-Mount Air Conditioners MODELS: EAH1020A-EAH1060A & EGH1072A (Single Stage) EAH2024A-EAH2060A & EGH2072A (2-Stage) IMPORTANT This manual may include information for options and features which may not be included on the unit being installed.
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Page 2: How To Use This Manual
How To Use This Manual This manual is intended to be a guide to the Eubank Wall Mount family of vertical air conditioners. It contains installation, troubleshooting, maintenance, warranty, and application information. The information contained in this manual is to be used by the installer as a guide only. -
Page 3: Table Of Contents
DANGER Failure to comply will result in death or severe personal injury and/or property damage. WARNING Failure to comply could result in death or severe personal injury and/or property damage. CAUTION Failure to comply could result in minor personal injury and/or property damage. Used to point out helpful suggestions that will result in improved installation, reliability or IMPORTANT operation. - Page 4 Chapter 4 Start-Up Check-Out of Cooling Cycle .........................45 Check-Out of Heating Cycle ........................45 Chapter 5 Troubleshooting Overview ..............................46 Failure Symptoms Guide ........................47 Compressor Troubleshooting .........................47 Control Board Diagnosis ........................48 Control Board Diagnosis (Alternate Construction) ................48 Chapter 6 Maintenance Scheduled Maintenance .........................50 Chapter 7 Service &...
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Page 5: General Description
Chapter 1 Description & Specifications General Description The Eubank EAH and EGH are a series of vertical wall-mounted air conditioning systems that provide heating, cooling, and ventilation for electronic equipment shelters, process control centers, and other applications with high internal heat gains. The series includes multiple sizes and nominal cooling capacities from 18,000 to 72,000 BTUH. -
Page 6: Air Flow, Weights And Filter Sizes
Model Identification The model identification number is found on the data sticker. Rating plate located on side panel. Example E Position 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 E = Eubank Wall Mount A = UV Light Unit Designation/Family... -
Page 7: Table 1 Cfm @ External Static Pressure
Note: Follow local codes and standards when designing duct runs to deliver the required airflow. Minimize noise and excessive pressure drops caused by duct aspect ratio changes, bends, dampers and outlet grilles in duct runs. Model 0.10 0.15 0.20 0.25 0.30 0.40 0.50... -
Page 8: General Operation
EAH1020A EAH1024A EAH1030A EAH1036A EAH1042A EAH1048A EAH1060A EGH1072A Top Supply 74.6 74.6 88.4 88.4 110.0 110.0 103.1 132.5 Minimum Room Size (ft²) Center Supply 146.4 146.4 173.4 173.4 215.8 215.8 202.3 260.1 Top Supply Minimum Supply Height (ft) Center Supply EAH2024A EAH2030A EAH2036A EAH2042A EAH2048A EAH2060A EGH2072A Top Supply 93.3... -
Page 9: Optional Controls And Packages
Economizer Operation The economizer is a regulated damper system with controls. The damper regulates the circulation of outside air into the enclosure (when the outdoor air conditions are suitable) to reduce the need for mechanical cooling, save energy, and extend compressor life. Depending upon the options selected, the damper responds to the enthalpy of the outdoor air. - Page 10 Dehumidification is achieved by operating mechanical cooling in conjunction with electric reheat. The strip heat is sized approximately to the sensible capacity of the total tonnage of the machine (i.e., on a 24,000 BTU unit the strip heat is sized at approximately 20,000 BTU). Because the strip heat is sized to the approximate sensible cooling capacity, only selected models are available.
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Page 11: Electrical Operation
or higher. Whenever the temperature is below 50°F (10°C), the fan cycle switch is in the circuit; when temperatures are 50°F (10°C) or higher, the fan cycle switch is not in the circuit. The outdoor thermostat is used with a TXV to prevent excessive cycling or “hunting” of the TXV. Desert Duty The Desert Duty package is a factory installed package of components and cabinet modifications which permit operation in harsh environments. -
Page 12: Figure 1A. Typical Electrical Schematic - Model Eah
Figure 1a. Typical Electrical Schematic - (Non-Economizer) Model EAH Eubank EAH/EGH Wall Mount AC Installation & Operation Manual 05/2025 Rev.4... -
Page 13: Figure 1B. Typical Electrical Schematic - Model Eah With Economizer
Figure 1b. Typical Electrical Schematic - (Economizer) Model EAH Eubank EAH/EGH Wall Mount AC Installation & Operation Manual 05/2025 Rev.4... -
Page 14: Figure 1C. Typical Electrical Schematic - Model Eah (Alternate Construction With Economizer)
Figure 1c. Typical Electrical Schematic - (Economizer) Model EAH (Alternate Construction) Eubank EAH/EGH Wall Mount AC Installation & Operation Manual 05/2025 Rev.4... -
Page 15: Figure 1D. Typical Electrical Schematic - Model Eah (Alternate Construction With Economizer)
Figure 1d. Typical Electrical Schematic - (Economizer) Model EAH (Alternate Construction) Eubank EAH/EGH Wall Mount AC Installation & Operation Manual 05/2025 Rev.4... -
Page 16: Figure 1E. Typical Electrical Schematic - Model Eah (Alternate Construction With Economizer)
Figure 1e. Typical Electrical Schematic - (Economizer), Model EAH (Alternate Construction) Eubank EAH/EGH Wall Mount AC Installation & Operation Manual 05/2025 Rev.4... -
Page 17: Chapter 2 Electronic Control Board
Chapter 2 Electronic Control Board Introduction WARNING Failure to observe the instructions contained in this document may result in personal injury and/or property damage and may void the warranty. Read this manual before installing, replacing or using this product. Eubank’s proprietary Printed Circuit Board (PCB) sets the standard for the industry in flexibility, reliability and performance. -
Page 18: Installation And Replacement
I/O Table for Control Board Item Description Economizer Actuator Output 2-10 VDC Outdoor Motor Control Output 0-10 VDC or PWM Indoor Motor Control Output 0-10 VDC or PWM Enthalpy Sensor Signal Input 4-20mA Outdoor Sensor Signal 10K NTC (Heat Pumps) / Dry Bulb Sensor Signal Input 10K NTC (Systems Equipped with Dry Bulb Economizer) Supply Air Sensor Signal Input 10K NTC (Systems Equipped with Economizer) Defrost Sensor Signal Input 10k NTC (Heat Pumps Only) - Page 19 2.3.1 – Programming Menu Configuration 1. To Enter Programming Mode: • Press and hold the Menu button for 5 seconds until P-01 is displayed. 2. While in Programming Mode main menu: • Press the Menu button to enter the displayed parameter menu. •...
- Page 20 Configuration Menu Details 1. System Type: This setting allows the PCB to be configured for AC (air-conditioner) or HP (heat- pump). The system type is configured at the factory during production testing for the appropriate system type. The default system type is AC. 2.
- Page 21 not be allowed to operate with the compressor in the heat-pump mode. When set to Y (yes) and upon a request for W2 (auxiliary / emergency heat) the compressor will shut off and the electric heat will operate. Note: SCKT and EHDD cannot both be set to the Y (yes) selection at the same time. SCKT takes priority over EHDD.
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Page 22: Operation
20. Dehum Supply Set: This setting allows the target setpoint for the supply air temperature during dehumidification operation. The setpoint range is adjustable from 70F to 75F with a fixed differential of 5F. The default setpoint is 72F 21. DS calibration: This setting is used to calibrate the defrost sensor from 0 to -18F. 22. -
Page 23: Sequence Of Operation
Sequence of Operation IMPORTANT All equipment should go through the recommended commissioning/start up sequence to ensure safety and system reliability. This document is only valid if the system is used as intended. This section defines the manner and method of control of the HVAC system. It will cover the following operations and protections. - Page 24 8.0 Smoke / Fire Shutdown 8.1 System Shutdown Contact Wiring Note: Equipment, devices and necessary system components are specified in the respective section. Note: 1. All inputs on the control board go through a 5 seconds Time-On Delay to prevent nuisance request. Compressor Outputs go through 5 seconds staggered Time On delay to prevent nuisance tripping of breaker due to the inrush associated with these large inductive loads.
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Page 25: Cooling Operation
2.0 Cooling Operation AC Systems Request Active Input Active Output Stage 1 Cooling (Fixed Compressor) CC1 (Partial Capacity) Stage 1 Cooling (2 Fixed Compres-sors) Y1 or Y2 CC1 or CC2 Respectively (Partial Capacity) Stage 1 Cooling (1 Staged Compressor) CC1 (Partial Capacity) Stage 2 Cooling (2 Fixed Compres-sors) Y1 + Y2 CC1 + CC2 (Full Capacity) - Page 26 Note: The system type must be configured for “HP” operation in setting 1 of the configuration menu of the control board for proper HP system operation. This system type is selected at the factory and there’s no need to change this setting. 2.2.1 Y1+ O Cooling (Partial Capacity 1st Stage) –...
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Page 27: Figure 2. Enthalpy Sensor And Temperature Control Points
changeover setpoint must be selected in setting 14 (default D=63F@50% rh). Example of Enthalpy Sensor and Enthalpy curve is shown below. Note: Selecting N=No in configuration setting 12 will disable economizer operation. DANGER Sever hazard. The economizer contains moving parts capable of causing serious injury or death. -
Page 28: Heating Operation
3.2 Dry Bulb Sensor and Operation – The dry bulb sensor only responds to the dry bulb temperature of the outside air and ignores the humidity. The sensor is a 10K NTC sensor probe. The factory setting is 63°F. This setpoint can be adjusted in 1F increments from 20F to 105F in the control board configuration menu setting 14. - Page 29 prior to energizing the Heater Output. The Indoor Motor will operate at the “W2” speed setting on the board or via Modbus. Once the Heater output is energized, the Heater comes on at full capacity (no staging). The Heater will remain on until the Heating setpoint is satisfied and the request is dropped.
- Page 30 Output. The Indoor Motor will operate at the “W2” speed setting on the board or via Modbus. Once the Heater output is energized, the Heater comes on at full capacity (no staging). The Heater will remain on until the Heating setpoint is satisfied and the request is dropped. Once the heating setpoint is satisfied, the Indoor motor continues to run based on the fan purge timer setpoint (default 90 seconds) selected in setting 3 of the configuration menu of the control board.
- Page 31 line temperature. When the liquid line temperature is below 80F the outdoor fan will shut off. A liquid line temperature above 115F will force the outdoor fan to operate at the maximum speed set on the control board for setting 7 in the configuration menu. The outdoor fan will speed up and slow down between liquid line temperature of 80F and 115F.
- Page 32 time on the same Cooling or Heat pump heating request, the system locks out. Lockouts can be monitored using the control board display for the current fault. The fault for a high-pressure lockout will displayed as “HP-Lc”. The faults can also be monitored via MODBUS by reading the respective value based on the MODBUS map that is provided.
- Page 33 Note: A freeze fault does not initiate and hard lockout condition. A freeze fault only interrupts the compressor cooling operation temporarily. The freeze sensor input is ignored if the sensor is not connected to the control board input. 6.5 Anti-Short Cycle – This is a built-in protection mechanism that increases the reliability of the compressor by protecting it from excessive short cycling.
- Page 34 Note: The nominal power supply for the control board is 24VAC and this voltage should be confirmed during startup to assure normal operation. 8.0 Smoke / Fire Shutdown 8.1 System Shutdown Contact Wiring – Add Normally Closed Dry contacts as shown for immediate shutdown of HVAC upon contacts opening.
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Page 35: Chapter 3 Installation
Chapter 3 Installation WARNING Failure to observe and follow Warnings and Cautions and these Instructions could result in death, bodily injury or property damage. Read this manual and follow its instructions and adhere to all Cautions and Warnings in the manual and on the unit. -
Page 36: Airflow Requirements
2. Remove access panels and check for loose wires. Tighten screw connections. 3. Complete and mail the warranty registration card. You must consider all of the following when choosing the installation site: 1. Noise. Install the unit so that the least amount of noise will be transmitted to inhabited spaces. 2. -
Page 37: Installation Materials
6. Codes: Make sure your installation conforms to all applicable electrical, plumbing, building, and municipal codes. Some codes may limit installation to single story structures. 7. Electrical Supply: The power supply must have the appropriate voltage, phase, and ampacity for the model selected. Voltage must be maintained above minimum specified values listed below. -
Page 38: Porting And Duct Work
Return Filter Grilles Used when filter must be changed from the interior. Not recommended for economizer equipped air conditioners. Note: Filter used in Return Filter Grille is 1” (25 mm) thick. For EAH1020A, EAH1024A, EAH1024A "B2" - 20” x 12” (508 mm x 305 mm) .....P/N 80671 For EAH1030A, EAH1030A “B2”, EAH1036A, EAH1036A “B2”... -
Page 39: Fresh Air Hood Installation
IMPORTANT: Eubank requires a minimum of 1" (25.4mm) from the surface of any supply ducts ® to combustible material for the first 3 feet (1 meter) of the duct. For all air conditioners with electric heat, the wall sleeve MUST have 1” (25.4 mm) clearance around all four sides of the opening. -
Page 40: Bracket Installation
Bracket Installation 1. All models have built-in mounting flanges. 2. Apply a bead of silicone sealer on the wall side of the bottom support brackets on the unit. Circle the mounting holes with the silicone bead. 3. Refer to Figure 4. Attach the bottom support bracket to the wall using appropriate 3/8" diameter hardware. -
Page 41: Electrical Connections
Electrical Connections WARNING ELECTRICAL SHOCK HAZARD Failure to follow safety warnings exactly could result in serious injury, death, and/or property damage. Turn off electrical power at fuse box or service panel BEFORE making any electrical connections and ensure a proper ground connection is made before connecting line voltage. - Page 42 CAUTION Note: Power supply service must be within allowable range (+10% - 5%) of rated voltage stamped on the unit rating plate. To operate nominal 230/208V unit at 208V, change the transformer line tap from 240V to 208V following the instruction on wiring label in unit.
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Page 43: Figure 6A. Humidistat Wiring Details To A Eubank Air Conditioner With Reheat
Remote Signalling: Terminals 5 & 7(N.O.) and 6 & 7 (N.C.) on the terminal board are dry contacts which can be used for remote signalling in the event of a/c cutoff on low or high pressure limit. Continuous fan operation: For continuous indoor fan operation on single units, install a jumper between terminals 8 and 3. -
Page 44: Figure 6C. Commstat™ 4 Hvac Controller Wiring Detail
, t l " l " 2 n i l n i l n i l " l " 2 " l " R l i t . t l A " " 1 A " " 2 n i l n i l n i l Figure 6c. -
Page 45: Chapter 4 Start-Up
Chapter 4 Start-Up Check-Out of Cooling Cycle Important: Be sure that the crankcase heater (if used) has been energized for at least 24 hours before starting the unit(s). Double-check all electrical connections before applying power. Eubank air conditioners with scroll compressors running on 3Ø power must be checked for proper rotation during the initial start-up. -
Page 46: Chapter 5 Troubleshooting
Chapter 5 Troubleshooting Overview A comprehensive understanding of the operation of the air conditioner is a prerequisite to troubleshooting. Please read the Chapter 1 for basic information about the unit. Eubank air conditioners are thoroughly tested before they are shipped from the factory. Although unlikely, it is possible that a defect may escape undetected, or damage may have occurred during transportation. -
Page 47: Failure Symptoms Guide
Failure Symptoms Guide PROBLEM/SYMPTOM LIKELY CAUSE(S) CORRECTION A. Unit does not run. 1. Power supply problem. 1. Check power supply for adequate phase and voltage. Check wiring to unit and external breakers or fuses. NOTE: An internal anti-short-cycle 2. Tripped internal disconnect. 2. -
Page 48: Control Board Diagnosis
1. Start-Up Voltage: Measure the voltage at the compressor contactor during start-up. The voltage must exceed the minimum shown in Table 5, section 2.2, or compressor failure is likely. A low voltage condition must be corrected. 2. Running Amperage: Connect a clip-on type ammeter to the (common) lead to the compressor. Turn on the supply voltage and energize the unit. - Page 49 The contactor will be closed 3 minutes after the unit is energized and only if cooling is required. The first fault condition will open the contactor and shutdown the unit. The contactor on the unit that has the fault condition must be closed before the second fault condition can be recognized by the control board.
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Page 50: Chapter 6 Maintenance
Chapter 6 Maintenance Scheduled Maintenance Repair and maintenance to electrical components shall include initial safety checks and component inspection procedures. If a fault exists that could compromise safety, then no electrical supply shall be connected to the circuit until it is satisfactorily dealt with. If the fault cannot be corrected immediately but it is necessary to continue operation, an adequate temporary solution shall be used. -
Page 51: Chapter 7 Service & Charging/Recovery
Chapter 7 Service & Charging/Recovery Safety Precautions Service Prior to beginning work on systems containing FLAMMABLE REFRIGERANTS, safety checks are necessary to ensure that the risk of ignition is minimized. For repair to the REFRIGERATING SYSTEM, the following shall be completed prior to conducting work on the system. 1. -
Page 52: Charging Procedures
If a leak is suspected, all naked flames shall be removed/extinguished. If a leakage of refrigerant is found which requires brazing, all of the refrigerant shall be recovered from the system, or isolated (by means of shut off valves) in a part of the system remote from the leak. Charging Procedures In addition to conventional charging procedures, the following requirements shall be followed. - Page 53 6. For appliances containing flammable refrigerants, refrigerants purging shall be achieved by breaking the vacuum in the system with oxygen-free nitrogen and continuing to fill until the working pressure is achieved, then venting to atmosphere, and finally pulling down to a vacuum (optional for A2L). This process shall be repeated until no refrigerant is within the system (optional for A2L).
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Page 54: Chapter 8 Decommissioning
Chapter 8 Decommissioning Decommissioning Before carrying out this procedure, it is essential that the technician is completely familiar with the equipment and all its details. It is recommended good practice that all refrigerants are recovered safely. Prior to the task being carried out, an oil and refrigerant sample shall be taken in case analysis is required prior to re-use of recovered refrigerant. -
Page 55: Start-Up & Commissioning Form
Chapter 9 Start-Up Check List Start-Up & Commissioning Form Please complete the information on this form and return to Eubank by mail or fax. The mailing address and fax number can be found at the end of the form. A. Equipment Information Date: ________________Equipment Owner _______________________________________ Installing Company: _____________________________Installer: ____________________ Address: _______________________________________State _______________________... - Page 56 C. Check Rated Voltage at Terminal Block for Imbalance before starting of Unit. ❒208/230V 1 Phase ❒208/230V 3 Phase ❒460V 3 Phase ❒380V 3 Phase 50Hz. ❒575 3 Phase 60 Hz. Measured Line to Line Volts L1&L2_______V. L1&L3 ________V. L2&L3______V. (L1&L2 + L1&L3 + L2&L3)/3 = Avg.
- Page 57 D. Heating Mode Check & Record Readings Circuit 1 Circuit 2 (if applicable) Room Temperature ________ ________ Outside Temperature ________ ________ Evap. Entering Air DB Temp ________ ________ Evap. Entering Air WB Temp ________ ________ Evap. Leaving Air DB Temp ________ ________ Evap.
- Page 58 After 10 minutes of compressor operation, record the following: Circuit 1 Circuit 2 (if applicable) Room Temperature ________ ________ Outside Temperature ________ ________ Suction Pressure ________ ________ Suction Line Temperature ________ ________ Discharge Pressure ________ ________ Discharge Line Temperature ________ ________ Entering Condenser Air ________...
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Page 59: Chapter 10 Warranty
Chapter 10 Warranty Marvair, Inc. Limited Product Warranty 10.1 Marvair Inc., warrants its products to be free from defects in materials and workmanship under normal use to the original purchaser for the period of time in the table below. If any part of your product fails within 12 months from start-up, or 18 months from shipment from the factory, whichever comes first, Marvair, Inc. -
Page 60: Appendix A: Electronic Control Board Modbus Map
APPENDIX A: Electronic Control Board Modbus Map Default Modbus RTU Settings Slave ID Baud = 19200 Data Bits = 8 Stop Bits = 1 Parity = None First Coil 1 , No. of Coils 30 RJ11 Pinout for Communication Discrete Bit/Bool: Read with Function Code 02 multi discrete input read, Write to RW coil with Function Code 05 Single Coil write. - Page 61 Registers: Read with Function Code 04 Multi register reads, Write to RW register with Function Code 06 write single register. Attempted Writes to RO registers result in error return. Func 0x10 multiple register writes not supported. MODBUS Human OBI PACKET Register ID REGISTER ZeroBase...
- Page 62 Current Status of MIN POS 16 bit 20 = MIN, 20-100= OPEN % Economizer Dry Bulb Temperature setpoint 16 bit 70F=default, 20F-105F ODS set 16 bit 50 default, 0-70 N= 0, 10-90 SECONDS, Fan Purge 16 bit 90 SEC IS DEFAULT Defrost Timer 16 bit 30= default, 30, 60, 90 minutes Current SW version number...
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Page 63: Appendix B: Installation Instructions For Field Installed Electric Heat, Models Eah1024A-Eah1072A
APPENDIX B: Installation Instructions for Field Installed Electric Heat, Models EAH1024A-EAH1072A WARNING FIRE HAZARD Improper adjustment, alteration, service, maintenance or installation could cause serious injury, death and/or property damage. Installation or repairs made by unqualified persons could result in hazards to you and others. - Page 64 WARNING ELECTRICAL SHOCK HAZARD Failure to follow safety warnings exactly could result in serious injury, death, and/or property damage. Turn off electrical power at fuse box or service panel BEFORE making any electrical connections and ensure a proper ground connection is made before connecting line voltage.
- Page 65 Eubank EAH/EGH Wall Mount AC Installation & Operation Manual 05/2025 Rev.4...
- Page 66 NOTES Eubank EAH/EGH Wall Mount AC Installation & Operation Manual 05/2025 Rev.4...
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