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Installation & Operation Manual
1.5 - 4 & 6 Ton Vertical Wall-Mount Heat Pumps
MAA1020H-MAA1024H
MAA1030H-MAA1036H
MAA1042H-MAA1048H
MGA1072H
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:
IMPORTANT
Manufactured By:
(229) 273-3636 • Fax (229) 273-5154
Heat Pump Product Manual
Vertical Wall-Mount Heat Pumps
Commercial Group
®
Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual
02/2021 Rev.2
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Table of Contents
Troubleshooting
Related Manuals for Marvair MAA1020H-MAA1024H MAA1030H
Summary of Contents for Marvair MAA1020H-MAA1024H MAA1030H
- 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 Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2...
- Page 2 For information on the efficiency, cooling and heating performance, please refer to the Product Data Sheets. The most current version of all literature can be found on our website at www.Marvair.com. If you are installing the heat pump unit, first read Chapter 1 and scan the entire manual before beginning the installation as described in Chapter 2.
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Page 3: Table Of Contents
4.1 Overview ............................... 30 4.2 Failure Symptoms Guide ........................31 4.3 Compressor Troubleshooting ........................ 32 4.4 Electric Heat Control ..........................33 Chapter 5 - Electrical Schematics 5.1 Electrical Schematics ..........................34 Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2... - Page 4 Table 3 Filter Sizes ..........................7 Table 4 Refrigerant Charge........................7 Table 5 Ambient Temperature Operating Ranges .................. 7 Table 6 Minimum Clearances ......................17 Table 7 Voltage Limitations ........................17 Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2...
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Page 5: General Description
All internal wiring is complete. Marvair MAA heat pump models are available in a wide variety of styles and configurations to meet the various ventilation and cooling requirements. For school classrooms, models are available to comply with the ASHRAE 62-1999 standard, “Ventilation for Acceptable Indoor Air Quality.”... -
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 Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2... -
Page 7: Air Flow, Weights, Filter Sizes, Refrigerant Charges And Ambient Operating Ranges
1.5 General Operation Refrigerant Cycle Marvair heat pumps use R-410A refrigerant in a conventional vapor-compression refrigeration cycle to transfer heat. In the cooling mode, a double blower assembly blows indoor air across the evaporator (indoor coil). Liquid refrigerant passing through the evaporator is boiled into gas by heat removed from the air. - Page 8 The cold, dry air absorbs heat and moisture from the desiccant. The warmed air is mixed with the return air from the classroom and distributed throughout the room. Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2...
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Page 9: Controls - Standard - Pc Board
The board also provides the ability to vary the speed of the indoor blower motor (electronically commutated motors excepted) and to select the number of seconds the blower will run after the compressor has turned Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2... - Page 10 The control board has four operational modes that can be defined by the installer. These modes are selected with jumpers. See Figure 1 for location of the jumpers. To change the factory setting, gently pull the jumper and slide it onto the desired setting. Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2...
- Page 11 20%-30% of the full speed. It will also incorporate a fixed hard start time of one second during which the condenser fan motor will turn on full speed for one second at start up. Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2...
- Page 12 Y The “Y” terminal is the compressor input from the thermostat. Given that all time delay and fault conditions are satisfied, the control will energize the compressor contactor through the “CC” terminals when there is a 24 VAC signal present at the “Y” terminal. Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2...
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Page 13: Pc Control Board
Line 1 Line 2 Contacts for Remote LPS W2 O G Alarms Damper Open/Damper Close Defrost Time Delay S-Circuit (30-60-90 Minutes) Test Electric Heat During Defrost Figure 1 - PC Control Board Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2... -
Page 14: Options
Adjustable Outdoor Thermostat Will not allow electric resistance heat to be energized unless the outdoor temperature is below the desired set point. Field or factory installed. Available on all Marvair units. P/N 93934 Single Point Feed When multiple internal disconnects are used, single point feed permits only one field power supply to heat pump. -
Page 15: Figure 2 Enthalpy Sensor Temperature Control Points
The thermistor senses the air temperature entering the structure, and provides a signal to the economizer controller for modulating the position of the damper. Nominal resistance of the sensor at 77°F is 3000 ohms. Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2... -
Page 16: Chapter 2 - Installation
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 Marvair unit. -
Page 17: Installation Materials
2.3 Installation Materials Installation Kits Marvair MAA Heat Pumps have built-in mounting flanges that function as side brackets. All models require and are shipped with a bottom mounting bracket. On units with the "N" ventilation option, there is a fresh air hood factory installed behind the lower front panel. - Page 18 1” (25mm) thick filter. The return filter grille is not recommended for use with the MAA heat pumps with economizers. Additional Items Needed: Additional hardware and miscellaneous supplies (not furnished by Marvair ) are needed for installation. ®...
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Page 19: Porting And Duct Work
The duct system must be engineered to assure sufficient air flow through the Heat Pump, even under adverse conditions such as dirty filters, etc. Proper engineering will insure longevity and maximum performance from the Heat Pump unit. Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2... -
Page 20: Fresh Air Hood Adjustment
Figure 3 - Fresh Air Hood Damper Adjustment 2.6 Bottom Bracket Installation 1. Remove and discard the 4 x 4 shipping boards attached to the base of the unit. Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2... -
Page 21: Mounting The Unit
The duct extensions must be constructed of galvanized steel with a minimum thickness of .019” as per the NFPA standards 90A & 90B. Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2... -
Page 22: Electrical Connections
All electrical work must meet the requirements of local codes and ordinances. Work should be done only by qualified persons. CAUTION This Marvair Heat Pump may incorporate an internal crankcase heater for compressor protection. The crankcase heater must be energized for at least 24 hours prior to starting the compressor. - Page 23 Terminals 8 & 10 on the Marvair with economizer can be connected to a normally closed smoke alarm or fire stat to cause equipment shutdown when the circuit is opened. (Remove factory jumper).
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Page 24: Figure 5A Humidity Control Wiring Detail
Figure 5a - Humidity Control Wiring Detail - Heat Pumps Figure 5b - Thermostat Connection Diagram Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2... -
Page 25: Chapter 3 - Start-Up
Various thermostats can be used to control the heat pump. The thermostat may have a fan switch with an Automatic and On positions, a system switch with Heat, Cool, and Off positions, and an emergency heat position with lights. The spec sheets have detailed description of the various Marvair ®... -
Page 26: Check-Out Of Heating Cycle
2. Raise the heating set point temperature to a setting which is higher than the room temperature. The fan and compressor should cycle on after time delay (standard on Marvair heat pumps with an economizer and optional on all other Marvair units) has cycled. -
Page 27: Figure 6 Temperature Sensor Wires - Modulating Hgr Valve
68ºF and no higher than 78ºF. Allow the refrigerant system to stabilize for at least five minutes and adjust the temperature as desired. Adjustment Knob Positive (Red) Negative (Black) Figure 7 - Desired Temperature Set Point Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2... -
Page 28: Ventilation System Set Up
3.4 Ventilation System Set-Up: Manual Fresh Air System (Configuration N). This is the standard ventilation system in Marvair heat pumps. Fresh air ventilation by means of a damper can provide up to 15% of rated air flow of outside air. The damper has four positions corresponding to 0, 5, 10 and 15% of rated air flow of outside air. -
Page 29: Figure 9 Damper Air Path
The motorized damper, Configuration B, can be controlled by an optional relay that allows additional external control with a choice of 24, 120 or 240V coils to regulate fresh air ventilation in response to a control located remote from the Marvair heat pump. GreenWheel ERV (Configuration H). -
Page 30: Chapter 4 - Troubleshooting
Please read the Chapter 1 for basic information about the unit. Marvair Heat Pumps are thoroughly tested before they are shipped from the factory. However, it is possible that a defect may escape undetected, or damage may have occurred during transportation. However, the great majority of problems result from installation errors. -
Page 31: Failure Symptoms Guide
Test components (especially the compressor) for shorts. 4. Excessively high or low supply volt- 4. Note voltage range limitations specific to the age or phase loss (3ø only). compressor troubleshooting section. Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2... -
Page 32: Compressor Troubleshooting
A short circuit at a high voltages indicates a motor defect. Do not do this test under vacuum. 4. On single phase models, check the capacitor by substitution. Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2... -
Page 33: Electric Heat Control
This switch would typically open if both elements of the dual thermal cut-out switches failed. Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2... -
Page 34: Chapter 5 - Electrical Schematics
The indoor evaporator fan motor is cycled by the blower timed delay relay. See Figure 9. Due to the large number of variations and options available for the Marvair heat pumps, it is not practical to include every possible wiring schematic in this manual. The following schematics are typical. Included in each heat pump is the electrical schematic for that unit. -
Page 35: Figure 11A Typical 1Ø Electrical Schematic Diagram Heat Pump With Manual Outside Air Damper
Figure 11a - Typical 1ø Electrical Schematic Diagram Heat Pump (Models MAA) with Manual Outside Air Damper Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2... -
Page 36: Figure 11B Typical 208/230V. 3Ø Heat Pump Electrical Schematic Diagram
Figure 11b - Typical 208/230v. 3ø Electrical Schematic Diagram Heat Pump (Models MAA) Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2... -
Page 37: Figure 11C Typical 460V. 3Ø Heat Pump Electrical Schematic Diagram, With Pc Control Board
Figure 11c, Typical 460v. 3ø Electrical Schematic Diagram Heat Pumps, Models MAA, with the PC Control Board Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2... -
Page 38: Scheduled Maintenance
Regularly check the primary and secondary condensate drains. The secondary drain has a stand pipe. An obstruction will force water to dump into the middle of the unit and drain out the sides of the Marvair Heat Pump, causing discoloration of the side panels. If discoloration is noted, service the drains. -
Page 39: Chapter 7 - Warranty Information 7.1 Standard Product 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 40: Appendix A - Installation Instructions Of Field Installed Electric Heat
The 1" (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 41 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 Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2...
- Page 42 Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2...
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Page 43: Appendix B: Heat Pump Start-Up - Commissioning Checklist
Is the correct filter(s) in place and clean? ................. ❒Yes ❒No Refrigerant Piping Is there any evidence of refrigerant leaks (oil leaks, etc.)? ..........❒Yes ❒No If leaks are found, report them to Marvair Warranty Service Dept. Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2... - Page 44 If using a standard thermostat, Set the Control to ON, Mode to Cooling, Fan to Auto (other controls, set appropriately for cooling mode). Note: The reversing valve (Marvair Heat Pumps) is energized for “Cooling”. The “O” signal from the thermostat is Required.
- Page 45 719 / 3 = 239.7 Volts (Average Voltage) 239.7 (Average Voltage) – 235 (Maximum Deviation) = 4.7 (Deviation Difference) (4.7 x 100)/239.7 = 1.95% Voltage Imbalance (Less than 2% is acceptable) Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2...
- Page 46 Is the Compressor On? ...................... ❒Yes ❒No Is the Condenser Fan (CFM) On? ..................❒Yes ❒No Is the Heater Off? (Clamp an AmpProbe on one leg of the heater contactor to verify) ... ❒Yes ❒No Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2...
- Page 47 Return Air Temperature (RAT) wb (used to calculate RH% of Return Air) ºF Supply Air Temperature (SAT) db (Acceptable Range 55ºF (+/- 3ºF) ºF Return Air Temperature (SAT) wb (used to calculate RH% of Supply Air) ºF Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2...
- Page 48 If using a standard thermostat, Set the Control to ON, Mode to Heat, Fan to Auto (other controls, set appropriately for heating mode). Note: The reversing valve (Marvair Heat Pumps) is de-energized for “Cooling”. The “O” signal from the thermostat is Not Required.
- Page 49 Mechanical Heat Lockout, start heating with Only Electric heat. Notice: system did not turn off. “Mechanical Heat” turned Off and “Electric Heat” turned On. Note: The “S” Circuit (Marvair Heat Pump control board) must be set to “Yes”, to allow Mechanical Heat Lockout.
- Page 50 ** Please provide a description of the issue in the Notes section below and if you need help, call: Marvair Technical and Warranty Support: (888) 726-2734 This number is manned M-F, 8:00am to 5:00pm eastern. Technical support calls will be returned M-F, 5:00pm to 8:00pm eastern.
- Page 51 Notes: ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ Marvair Wall Mount H/P MAA1020H-1048H/MGA1072H I&O Manual 02/2021 Rev.2...
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