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Installation & Operation Manual
10 & 11 EER Vertical Wall-Mount Air Conditioners
MAA1018A-MAA1060A, MGA1072A
(Single Stage)
MAA2060A-MAA2072A, MGA2072A
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: marvairsales@airxcs.com • Internet: www.Marvair.com
The most current version of this manual can be found at www.Marvair.com.
MODELS:
(2-Stage)
IMPORTANT
Manufactured By:
Marvair, 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
Marvair MAA/MGA Wall Mount AC Installation & Operation Manual
05/2023 Rev.21
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Table of Contents
Troubleshooting
Related Manuals for ACS Marvair MAA1018A
Summary of Contents for ACS Marvair MAA1018A
- Page 1 Air Conditioner Product Manual Vertical Wall-Mount Air Conditioners with Front Control Box Panel Installation & Operation Manual 10 & 11 EER Vertical Wall-Mount Air Conditioners MODELS: MAA1018A-MAA1060A, MGA1072A (Single Stage) MAA2060A-MAA2072A, MGA2072A (2-Stage) IMPORTANT This manual may include information for options and features which may not be included on the unit being installed.
- Page 2 How To Use This Manual This manual is intended to be a guide to the Marvair 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.
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Page 3: Table Of Contents
WARNING • If the information in these instructions are not followed exactly, a fire may result causing property damage, personal injury or loss of life. • Read all instructions carefully prior to beginning the installation. Do not begin installation if you do not understand any of the instructions. •... - Page 4 Chapter 5 Troubleshooting Overview ..............................45 Failure Symptoms Guide ........................45 Compressor Troubleshooting .........................46 Control Board Diagnosis ........................47 Chapter 6 Maintenance Scheduled Maintenance .........................48 Chapter 7 Warranty Marvair Limited Product Warranty ......................49 Chapter 8 Start-Up Checklist Start-Up & Commissioning Form ......................50 Appendix A Installation Instructions for Field Installed Electric Heaters ................54 Illustrations Figure 1a.
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Page 5: General Description
Chapter 1 Description & Specifications General Description The Marvair MAA and MGA 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: Model Identification
Model Identification The model identification number is found on the data sticker. Rating plate located on side panel. Example M Position 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 M = Marvair Wall Mount D = Dry Bulb Sensor Unit Designation/Family... -
Page 7: Serial Number Date Code
Serial Number Date Code 20 = 2020 01 = January 05 = May 09 = September 21 = 2021 02 = February 06 = June 10= October 22 = 2022 03= March 07 = July 11 = November 23 = 2023 04 = April 08 = August 12 = December... -
Page 8: Optional Controls And Packages
Model Model Refrigerant Charge (Oz) Refrigerant Charge (Oz) MAA1018A MAA1042A MAA1020A MAA1048A MAA1024A MAA1060A MAA1024-1030A "B2" MAA2072A MAA1030A MGA1072A MAA1036A & "B2" MGA2072A Table 5. Refrigerant Charge (R410A, Ounces) Refrigerant Cycle (Cooling Mode) Marvair air conditioners use R-410A refrigerant in a conventional vapor-compression refrigeration cycle to transfer heat from air in an enclosed space to the outside. - Page 9 The fan cycle control is standard on all Marvair air conditioners and operates based upon the liquid line pressure. The outside thermostat closes whenever the outside temperature is below 50°F (10°C) and opens when the outside temperature is 50° F (10°C) or higher. Whenever the temperature is below 50°F (10°C), the fan cycle switch is in the circuit;...
- Page 10 In applications where a shelter has redundant air conditioning units and is controlled by a lead lag control- ler (CommStat Touch, CommStat 4, CommStat 3 HVAC Controller), most times the dehumidification option is only necessary on one of the two units. It is possible for one unit to be operating in the cooling mode while the unit with dehumidification is operating at the same time.
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Page 11: Electrical Operation
Cabinet Color and Material Marvair air conditioners are available in three different cabinet colors -the standard Marvair beige, white and gray. The standard cabinet’s sides, top and front panels are constructed of 20 gauge painted steel. As an option, these panels can be built of 16 gauge steel in beige & gray or .050 stucco aluminum. When the 16 gauge painted steel or the aluminum is used, only the side, top and front panels are 16 gauge or aluminum. -
Page 12: Figure 1A. Typical Electrical Schematic - Model Maa
Figure 1a. Typical Electrical Schematic - (Non-Economizer) Model MAA Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 05/2023 Rev.21... -
Page 13: Figure 1B. Typical Electrical Schematic - Model Maa With Economizer
Figure 1b. Typical Electrical Schematic - (Economizer) Model MAA Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 05/2023 Rev.21... -
Page 14: Figure 1C. Typical Electrical Schematic - Model Maa (Alternate Construction With Economizer)
Figure 1c. Typical Electrical Schematic - (Economizer) Model MAA (Alternate Construction) Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 05/2023 Rev.21... -
Page 15: Figure 1D. Typical Electrical Schematic - Model Maa (Alternate Construction With Economizer)
Figure 1d. Typical Electrical Schematic - (Economizer) Model MAA (Alternate Construction) Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 05/2023 Rev.21... -
Page 16: Figure 1E. Typical Electrical Schematic - Model Maa (Alternate Construction With Economizer)
Figure 1e. Typical Electrical Schematic - (Economizer), Model MAA (Alternate Construction) Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 05/2023 Rev.21... -
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. Marvair’s proprietary Printed Circuit Board (PCB) sets the standard for the industry in flexibility, reliability and performance. -
Page 18: Installation And Replacement
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. AC/HP Select: 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 for W2 (auxiliary / emergency heat). When the SCKT Set is set to Y (yes) the electric heat will 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.
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Page 22: Operation
the Dehum speed is 80% of maximum speed. The speed may be adjusted from 60-100% in 1% increments to meet desired airflow requirements. 18. DS Calibration: This setting is used to calibrate the defrost sensor from 0 to -18F. 19. SAS Calibration: This setting is used to calibrate the supply air sensor from 0 to -18F. 20. - Page 23 1.0 Indoor Blower Operation 1.1 G - Indoor Blower Only 1.2 Y1 - Indoor Blower Operation 1.3 Y2 - Indoor Blower Operation 1.4 W2 – Indoor Blower Operation 1.5 HUM – Indoor Blower Operation 2.0 Cooling Operation AC / HP 2.1 Mechanical Cooling (AC systems) 2.1.1 Partial Capacity 2.1.2 Full Capacity...
- Page 24 1.0 Indoor Blower Operation The speed at which the indoor blower will operate is based on the discrete operational inputs that have 24vac applied. These inputs are listed below. 1.1 G Input – A request for Fan Only (independent G-signal via Digital input or Modbus), results in the indoor motor turning “ON”...
- Page 25 2.1 Mechanical Cooling (AC systems) – This section will describe the sequence of operation which takes place during Direct Expansion (DX) cooling from a control standpoint. Note: The system type must be configured for “AC” operation in setting 1 of the configuration menu of the control board for proper AC system operation.
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Page 26: Table 6. Modbus Network Address Dip Switch Positions
to the “Y1” speed setting on the board or via Modbus. It also outputs a request dependent (based on FCC IN) control signal for the Outdoor Fan Motor (Only applicable to ECM motors). In Stage 1 Cooling operation, the compressor operates at partial capacity and the indoor fan remains on continuously but the outdoor fan modulates based on liquid line temperature. -
Page 27: Figure 2. Enthalpy Sensor And Temperature Control Points
Enthalpy Setpoint is Setting 14 in control board configuration menu. Options A= 73ºF B= 70ºF C= 67ºF D= 63ºF E= 55ºF All settings are @ 50%Rh Figure 2. Enthalpy Sensor & Temperature Control Points Enthalpy Operation On a call for cooling from the wall-mounted thermostat, if outdoor conditions are suitable, the sensor will open the damper and admit outside air (i.e., economizer free cooling). -
Page 28: Figure 3. Dry Bulb Sensor
Figure 3. Dry Bulb Sensor On a call for cooling from the wall-mounted thermostat, if outdoor conditions are suitable, the sensor will open the damper and admit outside air (i.e., economizer free cooling). If the outdoor ambient is too hot (dry bulb sensor only), the sensor will place the actuator in the closed or minimum open position and activate mechanical cooling. - Page 29 on the fan purge timer setpoint (default 90 seconds) selected in setting 3 of the configuration menu of the control board. Note: A request for Cooling and Heating at the same time is not allowed and control board will not allow the electric heat to operate. 4.2 Heat Pump Heating Operation –...
- Page 30 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. When the system is operating in Heap Pump mode the electric heat is considered as supplemental heat and will only be allowed under certain conditions due to additional features that may be used.
- Page 31 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. Systems with (PSC Outdoor Motors) utilizes a Fan Cycle Switch which closes at 400 PSIG to energize the OFR (outdoor fan relay) to start the outdoor fan which runs until the switch reopens (at 290 PSIG).
- Page 32 The sensor is secured to the common suction line of the system to monitor the suction line temperature. This condition describes the abnormal fall in Suction Line Temperature below 9ºF. This fault will only be active when the Low-Pressure Sensor detects suction line temperatures below 9ºF during a request for Cooling / Heat pump heating.
- Page 33 10vdc signal from the ECO output of the control board to drive the motorized damper fully open. Note: The compressor and electric heat WILL NOT operate while in the emergency ventilation mode. 7.3 Forced Cooling (economizer equipped systems) – During economizer cooling, if a request for “Forced Cooling”...
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Page 34: 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 35: Table 7 Minimum Clearances
the heater element. This includes proper supply duct sizing, sufficient quantity of supply registers, and adequate return and filter areas. Duct work must be of correct material and must be properly insulated. Duct work must be constructed of galvanized steel with a minimum thickness of .019 inches. -
Page 36: Installation Materials
Installation Materials Installation Kits Marvair air conditioners are shipped with one 12 Ga. "L" shaped bottom bracket. If you have not yet unpacked the unit, follow the instructions in section 2.1. All units have built-in full length mounting flanges. Therefore, use of mounting brackets is not required. Kit Components: 1. -
Page 37: Porting And Duct Work
Additional Items Needed: Additional hardware and miscellaneous supplies (not furnished by Marvair ) are needed for installation. ® For example, the list below contains approximate quantities of items typically needed for mounting a unit on a wood frame wall structure. Concrete or fiberglass structures have different requirements. (10) 3/8"... -
Page 38: Fresh Air Hood Installation
Ducting Extensions should be cut flush with the inside wall for applications without duct work. Applications using duct work should be designed and installed in accordance with all applicable safety codes and standards. Marvair strongly recommends referring to the current edition of the National ®... -
Page 39: 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 40: 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 41 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 42: Figure 6A. Humidistat Wiring Details To A Marvair Air Conditioner With Reheat
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. For continuous indoor fan operation on dual units using the older LL357D4, install jumper between 8 and 3 and remove jumper between 1 and 3. - Page 43 , 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.
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Page 44: 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. Marvair air conditioners with scroll compressors running on 3Ø power must be checked for proper rotation during the initial start-up. -
Page 45: 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. Marvair 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 46: Compressor Troubleshooting
C. Unit cycles on high/low pressure 1. Loss or restriction of airflow. 1. Check blower assembly for proper operation. Look limit. for airflow restrictions, e.g.. the air filter. Check blower motor and condenser fan. 2. Restriction in refrigerant circuit. 2. Check for blockage or restriction, especially filter drier and capillary tube assembly. -
Page 47: Control Board Diagnosis
Resistance can be measured as shown above. Any deviation from above values could indicate a defective compressor. 4. High Voltage/Insulation Test: Test internal leakage with a megoh meter. Attach one lead to the compressor case on a bare metal tube and to each compressor terminal to test the motor windings. A short circuit at high voltages indicates a motor defect. -
Page 48: Chapter 6 Maintenance
Chapter 6 Maintenance Scheduled Maintenance Marvair strongly recommends that the air conditioner be serviced a minimum of twice a year – once prior to the heating season and once prior to the cooling season. At this time the filters, evaporator coil, condenser coil, the cabinet, and condensate drains should be serviced as described below. -
Page 49: Chapter 7 Warranty
Chapter 7 Warranty Marvair, Inc. Limited Product Warranty 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 50: Chapter 8 Start-Up Checklist
Chapter 8 Start-Up Check List Start-Up & Commissioning Form Please complete the information on this form and return to Marvair 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 51 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 52 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 53 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 54: Installation Instructions For Field Installed Electric Heaters
APPENDIX A: Installation Instructions for Field Installed Electric Heat, Models MAA1024A-MAA1072A 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 55 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 56 Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 05/2023 Rev.21...
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