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Installation & Operation Manual
11 EER Vertical Wall-Mount Air Conditioners
MAA1018A-MAA1060A, MGA1072A
(Single Stage)
MAA2060A-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.
A Division of the AIRXCEL
P.O. Box 400 • Cordele, Georgia 31010 • 156 Seedling Drive • Cordele, Georgia 31015
E-mail: marvairsales@airxcel.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:
(229) 273-3636 • Fax (229) 273-5154
Air Conditioner Product Manual
Vertical Wall-Mount Air Conditioners
with Front Control Box Panel
Commercial Group
®
Marvair MAA/MGA Wall Mount AC Installation & Operation Manual
02/2021 Rev.13
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Table of Contents
Troubleshooting
Related Manuals for Marvair MAA1018A-MAA1060A
Summary of Contents for Marvair MAA1018A-MAA1060A
- Page 1 P.O. Box 400 • Cordele, Georgia 31010 • 156 Seedling Drive • Cordele, Georgia 31015 (229) 273-3636 • Fax (229) 273-5154 E-mail: marvairsales@airxcel.com • Internet: www.Marvair.com The most current version of this manual can be found at www.Marvair.com. Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13...
- 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
INSTALLER: Affix the instructions on the inside of the building adjacent to the thermostat. END USER: Retain these instructions for future reference. Table of Contents Chapter 1 Marvair Wall Mount Air Conditioner Description & Specifications General Description ..........................5 Model Identification ..........................6 Serial Number Date Code ........................7 Air Flow, Weights and Filter Sizes ......................7... - Page 4 MODBUS Network Address DIP Switch Positions ..............26 Table 7a. MODBUS Discrete Registers ....................30 Table 7b. MODBUS Registers........................31 Table 8 Minimum Clearances .........................33 Table 9 Voltage Limitations ........................33 Table 10 Maximum Static Pressure ......................36 Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13...
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Page 5: General Description
MAA modes are available with cooling capacities of 18,000 to 60,000 BTUH and EER’s of 11.00 to 11.50. MGA models have 72,000 BTUH (6 ton) capacity and are 10 EER. The Marvair Product Data Sheets have detailed information on the capacities and efficiencies for each model. -
Page 6: Model Identification
$ = Special Configuration Not Covered by + = None Model Nomenclature $ = Special Note: Not all options are available with all configurations. Contact your Marvair sales representative for configuration details and feature compatibility. Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13... -
Page 7: Serial Number Date Code
12 = December Air Flow, Weights and Filter Sizes Complete electrical and performance specifications and dimensional drawings are in the Marvair Wall Mount Air Conditioner Product Data Sheets. Note: Follow local codes and standards when designing duct runs to deliver the required airflow. -
Page 8: Optional Controls And Packages
The fan cycle control is standard on all Marvair air conditioners and operates based upon the liquid line Marvair MAA/MGA Wall Mount AC Installation & Operation Manual... - Page 9 20°F (-7°C) or minus 20°F (-29°C). Please refer to Hot Gas Bypass Application Bulletin for details. Electric Reheat Dehumidification A humidity controller allows electric heat and cooling to operate simultaneously. Marvair air conditioners ® equipped with the dehumidification option allow the indoor humidity of the controlled environment to be maintained at or below a certain humidity set point.
- Page 10 (TXV), crankcase heater, hard start kit, and an outdoor thermostat and fan cycle switch. The fan cycle control is standard on all Marvair air conditioners and operates based upon the liquid line pressure. The outside thermostat opens whenever the outside temperature is below 50°F (10°C) and closes when the outside temperature is 50°F (10°C)
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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 02/2021 Rev.13... -
Page 13: Figure 1B. Typical Electrical Schematic - Model Maa
Figure 1b. Typical Electrical Schematic - (Economizer) Model MAA Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13... -
Page 14: Figure 1C. Typical Electrical Schematic - Model Maa (Alternate Construction)
Figure 1c. Typical Electrical Schematic - (Economizer) Model MAA (Alternate Construction) Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13... -
Page 15: Figure 1D. Typical Electrical Schematic - Model Maa (Alternate Construction)
Figure 1d. Typical Electrical Schematic - (Economizer) Model MAA (Alternate Construction) Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13... -
Page 16: Figure 1E. Typical Electrical Schematic - Model Mga (Alternate Construction)
Figure 1e. Typical Electrical Schematic - (Economizer), Model MGA (Alternate Construction) Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13... -
Page 17: Economizer Components
The sensor has eight set points. The factory setting is 58°F (14.5°C). These set points can be changed by moving the dip switches on the top of the dry bulb sensor. See Fig. 2. Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13... -
Page 18: Figure 2. Dry Bulb Sensor
NO outside air will be brought into the building. Setting the potentiometer to MAX means that the damper stays in the full OPEN position at all times. Factory setting is 50%. Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13... -
Page 19: Figure 3. Enthalpy Sensor Temperature Control Points
& 2 are jumpered on W3. See item 4 in Figure 4. Figure 3. Enthalpy Sensor Temperature Control Points Marvair Economizer Controller Figure 4. Electrical Controls, MAA Alternate Construction Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13... -
Page 20: Figure 5. Economizer Control Board
9. Enthalpy Dip Switches (MAR) terminal Set points are same as previous Honeywell controller. Factory setting is 4 (63°F/17.2°) 1=A (73°F/23.8°C) 2=B (70°F/21.1°C) 3=C (67°F/19.4°C) 4=D (63°F/17.2°) Figure 5. Economizer Control Board Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13... -
Page 21: Chapter 2 Electronic Control Board
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. This UL certified component is engineered to optimize Heating, Cooling and Dehumidification operation while communicating valuable information to the end user. -
Page 22: Installation And Replacement
Status 2 3 Blinks Freeze stat (optional) - Indoor coil temperature is below 35°F (1°C) Continuous Flash of Both LEDs Insufficient voltage to the board. Less than 20 Volts Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13... -
Page 23: Figure 6A. Setting The Speed For The Y1 And Y2 Operation For Indoor Motor
Power The Marvair PCB requires 24 VAC to operate. When the board is sufficiently powered, the “PWR” status light on the PCB illuminates “Green.” If there is insufficient power to the board, the “STATUS 1” and “STATUS 2” flashes continuously. Insufficient power to the board will result in no outputs being energized. -
Page 24: Figure 7. Output Termination For Indoor Motor Control Signal
Other Connected to “PWM” Outdoor Motor 0-10V Signal Output. One Wire Connected to “GND” and the Other Connected to “0-10V” Figure 9. Output Termination for Outdoor Motor Control Signal Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13... -
Page 25: Figure 10. Communications Setup
Communication The Marvair PCB comes equipped with MODBUS communication standard. There are 2 adjacent MODBUS communication ports connected in parallel. That is, both ports transmit the same information. The difference between the ports is the physical connection. One port is for RS-485 (3 wire shielded cable is recommended) and the other port is RJ-11. -
Page 26: Sequence Of Operation
5.1 High Pressure Lockout 5.2 Low Pressure Lockout 5.3 Low Voltage 5.4 Anti-short Cycle 6.0 Additional Features 6.1 MODBUS communication 6.2 Modulating Head Pressure Control 6.3 Freeze Stat Operation 6.4 Onboard Thermostat Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13... - Page 27 “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. In Stage 1 Cooling operation, the compressor Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13...
- Page 28 “FCC IN” input is High. The board continues to produce these outputs until the Dehumidification request is dropped. Once this request is dropped, the Indoor Fan Motor continues to run for 90 seconds. Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13...
- Page 29 Motor speeds for various operation, Outdoor Motor Speed, Heating Setpoint and Cooling Setpoint (if applicable) has to be configured via MODBUS. See MODBUS register tables at the end of this section. Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13...
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Page 30: Table 7A. Modbus Discrete Registers
0 = Modbus only Enables or disables reading the thermostat inputs in Modbus 1 Bit 1 = Read thermostat Inputs mode Default is 0 Table 7a. MODBUS Discrete Registers Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13... -
Page 31: Table 7B. Modbus Registers
12 = Future Use 13 = Freeze Fault 1 14 = Freeze Fault 2 15 = Y1 Locked Out 16 = Y2 Locked Out 17 = Low Voltage Table 7b. MODBUS Registers Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13... -
Page 32: Chapter 3 Installation
Protection Association Standards 90A and 90B before designing and installing duct work. The duct system must be engineered to insure sufficient air flow through the unit to prevent over-heating of Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13... -
Page 33: Table 8 Minimum Clearances
Electrical Rating Designations* Nominal Voltage 208/230 208/230 Phase Minimum Voltage Maximum Voltage * Letters refer to model number code designations. Refer to page 5. Table 9. Voltage Limitations Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13... -
Page 34: 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. -
Page 35: Porting And Duct Work
Attach the perimeter flange of the wall sleeve to the framed opening with appropriately sized screws. Since electric heat can be added after the unit has been installed, Marvair recommends that all installations have the 1” (25.4 mm) clearance around the wall sleeve. -
Page 36: Fresh Air Hood Installation
(no fresh air). To provide fresh air, remove the two screws on either side of the hood and reposition as desired. Figure 11. Fresh Air Hood Damper, Models 1024-1072 Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13... -
Page 37: Bracket Installation
For units with electric heat, a one inch clearance is required around the duct extensions. The duct extensions must be constructed of galvanized steel with a minimum thickness of .019” as per the NFPA standards 90A & 90B. Figure 12. Marvair A/C Wall Mount Detail Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13... -
Page 38: Electrical Connections
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. Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13... - Page 39 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. Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13...
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Page 40: Figure 13A. Humidistat Wiring Details
If desired, each of the set points can be quickly and easily changed in the field by the installer. It can be used with Marvair's unique vertical packaged wall mount air conditioners or other environmental control units. See CommStat 3 Product Data Sheet for installation and programming instructions. -
Page 41: Figure 13C. Commstat™ 3 Hvac Controller Wiring Detail
Figure 13c. CommStat 3 Wiring Diagram Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13... -
Page 42: Chapter 4 Start-Up
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 43: Chapter 5 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 44: Failure Symptoms Guide
3. Check relay for proper operation. Replace if defective. Compressor Troubleshooting NOTE: It is important to rule out other component failures before condemning the compressor. The following electrical tests will aid diagnosis: Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13... -
Page 45: Control Board Diagnosis
The unit must be in the cooling mode (compressor contactor Closed) before a fault condition can occur. Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13... -
Page 46: Chapter 6 Maintenance
Oiling of the condenser fan motor or the evaporator blower motor is not recommended. DANGER Sever hazard. The economizer contains moving parts capable of causing serious injury or death. Disconnect power before removing the covering panel. Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13... -
Page 47: Chapter 7 Warranty
5 Years Compressor If any part of your Marvair, Inc. unit fails within 90 days of the commencement of the warranty, Marvair, Inc. will furnish without charge, EX Works, Cordele, Georgia, the required replacement part and pay for the labor to replace the part in accordance with the Marvair, Inc. Flat Rate Labor Guidelines. -
Page 48: 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... - Page 49 L1 & L3 = 243 Volts = 717 / 3 = 239 Average Voltage L2 & L3 = 233 Volts 239 - 233 = 6 100 x 6/239 =2.5% Voltage Unbalance Three phase units only check fan & compressor rotation. Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13...
- Page 50 L1&L3 ________V. L2&L3______V. (L1&L2 + L1&L3 + L2&L3)/3 = Avg. Voltage = _______________ Max. Deviation from avg. voltage = ______________volts Voltage imbalance = (100 x Max. Deviation)/avg. Voltage = ___________% Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13...
- Page 51 ________ Compressor Amps (L1) ________ ________ Compressor Amps (L2) ________ ________ Compressor Amps (L3) ________ ________ Notes: _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13...
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Page 52: Installation Instructions For Field Installed Electric Heaters
(25.4 mm) clearance must extend on all sides of the supply duct for the first 3 feet (1 meter) from the unit. IMPORTANT: Marvair requires a minimum of 1" (25.4 mm) from the surface of any supply ducts to combustible material for the first 3 feet (1 meter) of the duct. - Page 53 15. Place the wiring diagram provided with the heater kit inside the zip lock bag which is affixed to the back side of the control box cover. 16. Replace the control box cover, the bottom front cover and the top front panel. Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13...
- Page 54 Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 02/2021 Rev.13...
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