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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.
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
09/2021 Rev.15
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Table of Contents
Troubleshooting
Related Manuals for Airxcel Marvair MAA1018
Summary of Contents for Airxcel Marvair MAA1018
- Page 1 INSTALLER: Affix the instructions on the inside of the building adjacent to the thermostat. END USER: Retain this manual for future reference. Manufactured By: A Division of the AIRXCEL Commercial Group ® P.O. Box 400 • Cordele, Georgia 31010 • 156 Seedling Drive • Cordele, Georgia 31015 (229) 273-3636 •...
- Page 2 Used to point out helpful suggestions that will result in improved installation, reliability or IMPORTANT operation. AS PART OF THE MARVAIR CONTINUOUS IMPROVEMENT PROGRAM, SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE. © 09/2021 Marvair, Division of Airxcel, Inc. Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 09/2021 Rev.15...
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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 Compressor Troubleshooting .........................44 Control Board Diagnosis ........................45 Chapter 6 Maintenance Scheduled Maintenance .........................46 Chapter 7 Warranty Airxcel Commercial Group Limited Product Warranty .................47 Chapter 8 Start-Up Checklist Start-Up & Commissioning Form ......................48 Appendix A Installation Instructions for Field Installed Electric Heaters ................52 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 Unit Designation/Family M = Marvair Wall Mount D = Dry Bulb Sensor... -
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
MAA1024-1030A MAA1036A MAA1018A MAA1020A MAA1024A MAA1030A MAA1042AMAA1048A MAA1060A MAA2072A MGA1072A "B2" & "B2" Model A C D Z A C D Z A C D Z A C D Z A C D Z A C D Z A A C D w/o Hot Gas Reheat w/Hot Gas... - Page 9 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; when temperatures are 50° F (10°C) or higher, the fan cycle switch is not 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 09/2021 Rev.15... -
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 09/2021 Rev.15... -
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 09/2021 Rev.15... -
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 09/2021 Rev.15... -
Page 16: Figure 1E. Typical Electrical Schematic - Model Maa (Alternate Construction)
Figure 1e. Typical Electrical Schematic - (Economizer), Model MAA (Alternate Construction) Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 09/2021 Rev.15... -
Page 17: Economizer Components
Economizer Components (Economizer Equipped Models Only) Damper Actuator: The damper actuator is a 24V motor that modulates the position of the damper blade. It is capable of driving a full 90 degrees within 90 seconds. The assembly has a spring return to close the damper during power outage. -
Page 18: Figure 2. Dry Bulb Sensor
Figure 2. Dry Bulb Sensor Once either the enthalpy or dry bulb sensor has determined that the outside air is suitable for cooling, the damper will open. The mixed air sensor will limit the air temperature delivered to the space by modulating the damper blade to mix warm indoor air with cooler outdoor air to provide a constant 50°F to 56°F (10°C to 13.5°C) Mixed Air Sensor:... -
Page 19: Figure 3. Enthalpy Sensor Temperature Control Points
Brand of Sensor Selection (W3 jumper) Honeywell enthalpy and dry bulb sensors are currently the only brand of sensors used in the air conditioners. Jumper W3 allows us to use alternative brands at a future date. On all current air conditioners, pins 1 &... -
Page 20: Figure 5. Economizer Control Board
1. W1 Economizer Sensor Selector 4. W3 Sensor Brand Selector 7. Minimum Position Potentiometer Jumper Pins 1 & 2 for enthalpy sensor Jumper Pins 1 & 2 for Honeywell sensor 0% to 100%. Factory setting is 50%. Jumper Pins 2 & 3 for dry bulb sensor Jumper Pins 2 &... -
Page 21: 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 22: Installation And Replacement
Item Description Outdoor Motor Control Signal Output Indoor Motor Control Signal Output P 1/2- Pressure for Circuit 1 and Circuit 2 (Respectively) FS1 – Freeze Stat for Circuit 1 FS2 – Indoor Temperature Input Modbus Communication 3 Wire [A, B, COM] and Parallel RJ-11 Port Fan Cycle Control Input (only Applicable for EC Outdoor Motors) Hum –... -
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
Output Termination for Indoor Motor Control Signal Note: Follow data (wiring and signal control signal type) of the appropriate motor to setup the PCB Indoor Motor PWM Signal Output. Reference Wire Connected to “GND” and the Signal Connected to “PWM” Indoor Motor 0-10V Signal Output. -
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
Address DIP Switch 1 DIP Switch 2 DIP Switch 3 DIP Switch 4 0 [Local Control] Table 6. MODBUS Network Address DIP Switch Positions 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. - Page 27 Equipment, devices and necessary system components are specified in the respective section. Note: 1. All inputs on the Controller 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.
- Page 28 and the indoor fan remains on continuously but the outdoor fan cycles based on head pressure. The Fan Cycle Control Switch (Low Ambient Control Switch) closes at 400 PSIG to set the “FCC IN” input High which in turn outputs a speed proportional to the “OFM Speed” setting on the board or by MODBUS.
- Page 29 5.0 – Refrigeration Protection 5.1– High Pressure Lockout This condition describes the abnormal rise in Head Pressure pass the system acceptable limit of 660 PSI (+/-20PSI). The fault will only be active when the High-Pressure Switch (Normally Closed) opens during a request for Cooling. The first time this fault condition occurs, the system cuts the compressor off WITHOUT locking out.
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Page 30: Table 7A. Modbus Discrete Registers
5.2 – Modulating Head Pressure Control A 10K Nominal NTC Thermistor is connected to the “P1” and “P2” inputs for circuit 1 and circuit 2 respectively. When this sensor is connected, the “FCC IN” is ignored and the thermistor value is used as the process variable when controlling the head pressure. -
Page 31: Table 7B. Modbus Registers
Registers: Read with Function Code 04, Write to RW or WO registers with Function Code 06 Description Size Data Format Heat Setpoint 16 Bit 45º-100º F Cool Setpoint 16 Bit 45º-100º F 0-20, 10 is default. Less Temperature Calibration 16 Bit than 10 is a negative offset, 11-20 is a positive offset 0-100, 80 is default. -
Page 32: 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 33: Table 8 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 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. Kit Components: 1. -
Page 35: 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 36: 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 37: 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 38: 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 39 2. Connect the wires to the input side of the internal breaker or terminal block (L1 & L2 for single- phase units; L1, L2, & L3 for three-phase models). 3. Install the ground wire on the ground lug. 4. For units designed for operation on 208/230V, 60Hz power supply, the transformer is factory wired for a 230V power supply.
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Page 40: Figure 13A. Humidistat Wiring Details
CommStat 4 Lead /Lag Controller Please refer to the Product Data sheet for the Commstat 4 controller for complete instructions on installing and programming this controller. CommStat 3 Controller (See Figure 13c) The CommStat 3 Controller is a solid state control package designed to operate a fully or partially redundant air conditioning system for a telecommunication cabinet or shelter. -
Page 41: Figure 13C. Commstat™ 3 Hvac Controller Wiring Detail
Figure 13c. CommStat 3 Wiring Diagram Figure 13d. CommStat 4 Wiring Diagram Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 09/2021 Rev.15... -
Page 42: 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 43: 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 44: 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 45: 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 46: Chapter 6 Maintenance
Chapter 6 Maintenance Scheduled Maintenance Airxcel Commercial Group 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 47: 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 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 Date: ________________Equipment Owner _______________________________________ Installing Company: _____________________________Installer: ____________________ Address: _______________________________________State _______________________... - Page 49 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 50 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 51 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 52: Installation Instructions For Field Installed Electric Heaters
Note: The following instructions are for general guidance only. Due to the wide variety of installation possibilities, specific instructions will not be given. When in doubt, follow standard and accepted installation practices, or contact Airxcel Commercial Group for additional assistance. Wall Openings Measure the dimensions of the supply and return ports on the unit. - Page 53 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 54 Marvair MAA/MGA Wall Mount AC Installation & Operation Manual 09/2021 Rev.15...
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Questions and answers
I have a vendor specifying the following Marv Air unit, and I need to confirm it is heat and cool and is single phase power. MAA1024AA050N++2+1EA+C31++++++
The Marvair MAA series, including the MAA1018 model, provides heating, cooling, and ventilation. The document mentions that MAA models offer resistance heating elements, confirming they support both heating and cooling. Additionally, the wiring instructions reference single-phase power connections (L1 & L2 for single-phase units), indicating that the unit operates on single-phase power.
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