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Installation & Operation Manual
Vertical Wall-Mount Heat Pumps
Single Stage Models:
MAA1020H • MAA1024H • MAA1030H
MAA1036H • MAA1042H • MAA1048H
MAA1060H • MGA1072H
2-Stage Models:
MAA2024H • MAA2030H • MAA2036H
MAA2042 •MAA2048H • MAA2060H
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.
IMPORTANT
Manufactured By:
Marvair, An AirX Climate Solutions Brand
(229) 273-3636 • Fax (229) 273-5154
Heat Pump Product Manual
Vertical Wall-Mount Heat Pumps
Marvair Wall Mount Heat Pump I&O Manual
06/2023 Rev.7
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Table of Contents
Troubleshooting
Related Manuals for ACS Marvair MAA1020H
Summary of Contents for ACS Marvair MAA1020H
- Page 1 Heat Pump Product Manual Vertical Wall-Mount Heat Pumps Installation & Operation Manual Vertical Wall-Mount Heat Pumps Single Stage Models: MAA1020H • MAA1024H • MAA1030H MAA1036H • MAA1042H • MAA1048H MAA1060H • MGA1072H 2-Stage Models: MAA2024H • MAA2030H • MAA2036H MAA2042 •MAA2048H • MAA2060H 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 comprehensive guide to the installation of the Marvair MAA family of vertical packaged ® heat pumps. 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. This manual does not supersede or circumvent any applicable national or local codes.
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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 5.1 Overview ............................... 40 5.2 Failure Symptoms Guide ........................41 5.3 Compressor Troubleshooting ........................ 42 5.4 Electric Heat Control ..........................43 Chapter 6 - Electrical Schematics 6.1 Electrical Schematics ..........................44 Chapter 7 - Periodic Maintenance Requirements 7.1 Scheduled Maintenance .........................
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Page 5: Chapter 1 - Description & Specifications
Chapter 1 Description and Specifications 1.1 General Description Marvair Wall Mount Heat Pumps are high efficiency, vertical wall mounted heat pumps that provide ® heating, cooling and ventilation for a wide range of applications. Single stage nominal cooling capacities range from 20,000 to 60,000 & 72,000 BTUH. 2-Stage units have nominal cooling capacities from 24,000 to 60,000 BTUH. -
Page 6: Model Identification
1.3 Model Identification 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 1 = Top Supply/Bottom Return Unit Designation/Family 18 Air Flow S = Stock Unit $ = Special Energy Efficiency Ratio... -
Page 7: General Operation
Model Weight Base w/Economizer w/3 Phase w/Economizer & 3 Phase MAA1020H/MAA1024H/MAA2024H Lbs (Kg) 337 (153) 357 (162) 356 (161) 376 (171) MAA1030H/MAA1036H/MAA2030H/MAA2036H Lbs (Kg) 397 (180) 419 (190) 416 (189) 438 (199) MAA1042H/MAA1048H/MAA2042H/MAA2048H Lbs (Kg) 453 (205) 476 (216) 491 (223) 514 (233) MAA1060H/MAA2060H Lbs (Kg) - Page 8 Ventilation Options ASHRAE standard 62 requires 15 cfm of outside air per occupant of a classroom. To meet this requirement, Marvair offers seven ventilation packages for every budget and requirement. Configuration “C”: Up to 100% Modulating Economizer The economizer reduces the cost of air conditioning by using outside air when acceptable to cool the room (Free Cooling).
- Page 9 Configuration “E”: Two-Position Motorized Fresh Air Damper w/Pressure Relief Ventilation & Independent Control Control Board/Factory Installed Relay Logic: The 92589 control board allows the position of the “E” damper to be set for desired outside air intake from fully closed to fully open. Setting 15 of the control board configuration menu allows the user to set the position from 20 (2VDC / Closed) to 100 (10VDC 100% open).
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Page 10: Options
1.6 Options Low Ambient Control The low ambient control permits mechanical cooling when outdoor ambient temperatures are low. The control uses a reverse-acting high pressure switch to cycle the condenser fan motor according to liquid refrigerant pressure conditions. Switch closure and fan operation occurs when the pressure reaches 400 PSIG. -
Page 11: 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 12: 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 13 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 14 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 15 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 16: 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 17 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 Cooling Operation AC / HP 2.1 Mechanical Cooling (AC systems) 2.1.1 Partial Capacity 2.1.2 Full Capacity 2.2 Mechanical Cooling (HP systems)
- Page 18 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 19 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.
- Page 20 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.
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Page 21: Figure 2 Enthalpy Sensor 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 22: 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 23 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 24 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 25 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 26 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. The Low-Pressure Sensor is bypassed on the initial call for cooling for 3 minutes to allow low ambient start-up of the system.
- Page 27 7.3 Forced Cooling (economizer equipped systems) – During economizer cooling, if a request for “Forced Cooling” (FC-signal via Digital input or Modbus) is present. The control board will force the economizer to close and start the compressor to operate at full capacity cooling. This is considered an override of the economizer in the event economizer cooling can’t keep up with the cooling demand in economizer mode.
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Page 28: 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 Marvair unit. -
Page 29: Installation Materials
5. Airflow Requirements: Note the minimum CFM requirements (section 2.4). Keep duct lengths as short as possible. Do not obstruct airflow through the unit. 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 30 Standard Kit Components 1. One 12 Ga. “L”-shaped bottom bracket Accessories: The package may include other factory-supplied items (optional ) listed on this and the following page: PART # DESCRIPTION 50107 Digital thermostat. 2 stage heat, 2 stage cool. 7 day programmable. Fan switch: Auto & On. Auto-change over.
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Page 31: Porting And Duct Work
(10) 3/8" mounting bolts or lag screws for side brackets and anchors, if required for side brackets. (20) 3/8" washers (10) 3/8" hex nuts 3/8" x 2-1/2" lag screws for bottom bracket • Silicone Sealer to seal around cracks and openings 7-conductor low voltage multi-colored wire cable (i.e. -
Page 32: Fresh Air Hood Adjustment
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 Fire ®... -
Page 33: Mounting The Unit
For example, on wooden structures, use 3/8 x 2-1/2 inch all-thread lag screws. The screws must penetrate the center of the wall stud. Drill a pilot hole in the stud to prevent it from splitting. For units with electric heat, a 1” clearance around the duct extensions is required. The duct extensions must be made of galvanized steel with a minimum thickness of .019”... -
Page 34: Electrical Connections
3.8 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 35: Figure 6A Humidity Control Wiring Detail
on the discharge line while the suction line temperature decreases. Reverse rotation also results in a substantially reduced current draw when compared to tabulated values. There is no negative impact on durability caused by operating three phase compressors in the reversed direction for a short duration of time, usually defined as less than one hour. -
Page 36: Figure 6B Thermostat Connection Diagram
Figure 6b - Thermostat Connection Diagram Marvair Wall Mount Heat Pump I&O Manual 06/2023 Rev.7... -
Page 37: Chapter 4 Startup
Chapter 4 Startup IMPORTANT If the heat pump unit has a crankcase heater be sure that the crankcase heater has been energized for at least 24 hours prior to start-up of the unit. Double check all electrical connections before applying power. Various thermostats can be used to control the heat pump. -
Page 38: Check-Out Of Heating Cycle
the outdoor fan may not come on immediately because it is cycled by refrigerant pressures Note: To check the system operation under different ambient conditions, the air temperature and enthalpy sensors must be "tricked". When outdoor ambient conditions are higher than the control setting, a component aerosol cooler may be sprayed directly into the enthalpy sensor to simulate low enthalpy conditions, causing the economizer damper to open. -
Page 39: Ventilation System Set Up
Wires from temperature sensor mounted in supply air. Figure 7 - Temperature Sensor Wires 2. Turn the unit on and the Hot Gas Reheat is operating. 3. Set the digital VOM for DC milliamp voltage. The milliamp voltage shown on the meter’s display corresponds to the desired air temperature (ºF). -
Page 40: Chapter 5 Troubleshooting
Chapter 5 Troubleshooting 5.1 Overview A comprehensive understanding of the operation of the Marvair Heat Pump is a prerequisite to ® 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. -
Page 41: Failure Symptoms Guide
5.2 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 timer will prevent the unit 2. -
Page 42: Compressor Troubleshooting
PROBLEM/SYMPTOM LIKELY CAUSE(S) CORRECTION E. Water on floor near unit. 1. Obstruction in condensate line. 1. Check for clog or restriction. 2. Obstruction or leak in condensate 2. Check pan for leak or blockage. pan. 3. Unit is not level. 3. -
Page 43: Electric Heat Control
5.4 Electric Heat Controls Figure 9 - Typical Configuration for Single Element Heater The electric heater assembly can have up to three individual heating elements. Each individual heating element is protected against overheating by its own dual function thermal cut-out switch. Additionally, a separate single function thermal cut-out switch protects the entire heater assembly. -
Page 44: Chapter 6 - Electrical Schematics
Chapter 6 Electrical Schematics 6.1 Electrical Schematics The compressor and condenser fan are energized with a contactor controlled by a 24 VAC pilot signal. The condenser (outside fan) motor is energized by the same contactor. However, the motor is cycled on and off by the low ambient control (see low ambient control 1.5). -
Page 45: Figure 10A Typical 1Ø Electrical Schematic Diagram Heat Pump With Manual Outside Air Damper
Figure 10a - Typical 1ø Electrical Schematic Diagram Heat Pump (Models MAA) with Manual Outside Air Damper Marvair Wall Mount Heat Pump I&O Manual 06/2023 Rev.7... -
Page 46: Figure 10B Typical 208/230V. 3Ø Heat Pump Electrical Schematic Diagram
Figure 10b - Typical 208/230v. 3ø Electrical Schematic Diagram Heat Pump (Models MAA) Marvair Wall Mount Heat Pump I&O Manual 06/2023 Rev.7... -
Page 47: Figure 10C Typical 460V. 3Ø Heat Pump Electrical Schematic Diagram, With Pc Control Board
Figure 10c - Typical 460v. 3ø Electrical Schematic Diagram Heat Pumps, Models MAA, with the PC Control Board Marvair Wall Mount Heat Pump I&O Manual 06/2023 Rev.7... -
Page 48: Scheduled Maintenance
Chapter 7 Maintenance 7.1 Scheduled Maintenance Marvair, Inc. strongly recommends that the heat pump 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 8 - Warranty Information 8.1 Standard Product Warranty
Chapter 8 Warranty 8.1 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: Appendix A - Installation Instructions Of Field Installed Electric Heat
APPENDIX A: Installation Instructions for Field Installed Electric Heat 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 51 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 52 Marvair Wall Mount Heat Pump I&O Manual 06/2023 Rev.7...
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Page 53: Appendix B: Heat Pump Start-Up - Commissioning Checklist
APPENDIX B: Heat Pump Start-Up - Commissioning Checklist Please complete the information on this form and email to MarvairCustServ@airxcel.com. Date: _____/_____/_______ Owner & Location Equipment Owner: ___________________________________________________________________ Address: __________________________________________________________________ City: __________________________________________________________________ State:_______, Zip:____________ Installing Contractor Company: _______________________________Installer: ____________________________ Address: __________________________________________________________________ City: __________________________________________________________________ State:_______, Zip:____________ Equipment Information... - Page 54 Check Incoming Power at Terminal Block and verify Proper Voltage and Balance BEFORE STARTING UNIT. ❒ 208/230V 1 Phase 60 Hz. ❒ 208/230V 3 Phase 60 Hz. ❒ 460V 3 Phase 60 Hz. ❒ 380V 3 Phase 50Hz. ❒ 575 3 Phase 60 Hz. ❒...
- Page 55 Cooling Mode (Mechanical Cooling) Close the Compressor (Cooling) circuit breaker. Power will be applied to the thermostat / control device. Setup / Configure the control for the desired settings. Adjust the cooling setpoint so there is No demand for cooling. The unit will not be running. Cooling Start If using a standard thermostat, Set the Control to ON, Mode to Cooling, Fan to Auto (other controls, set appropriately for cooling mode).
- Page 56 Cooling (Check and Record Readings) After about 10 minutes of operating in the cooling mode, check and record the following data points. Inside Temperature (IAT) ºF Outside Temperature (OAT) ºF Entering Condenser Air Temperature (Should be same temp as OAT) ºF Leaving Condenser Air Temperature (Acceptable Range 15º...
- Page 57 Electric Reheat Lock-Out While the system is still operating in “Dehumidification Mode”. Activate Mechanical Cooling. Do Not change the Humidity Setpoint on the Humidistat. Simply adjust the cooling setpoint to approximately four degrees below the current indoor temperature. After the short delay, the unit will sequence on, start cooling.
- Page 58 Economizer Cooling (Check and Record Readings) After about 10 minutes of operating in the cooling mode, check and record the following data points. All unit panels MUST be in place for proper operation and testing. Inside Temperature (IAT) ºF Outside Temperature (OAT) ºF Return Air Temperature (RAT) db (Should be same temp as IAT) ºF...
- Page 59 Auxiliary Heat (ODT) While the system is operating in “Mechanical Heating Mode”. Activate Auxiliary Heat (ODT). * Your unit may be configured with an outdoor thermostat configured as “Auxiliary Heat” or “Mechanical Heat Lockout”, or No outdoor thermostat. * Do Not change the temperature setpoint on the thermostat / control. Simply adjust the ODT setpoint to approximately four degrees below the current outdoor temperature.
- Page 60 Calculate Heater kW Single Phase Units Heater kW = (HCAL1*L1&L2)/1000 = _______________kW. Example: HCAL1 * L1&L2 1000 Measured Voltage: L1&L2 = 241 Volts Measured Amperage: L1 = 20.7 Amps 4988.7 / 1000 = 4.99kW (5kW) Three Phase Units Heater kW = (HCAL1*L1&L2) + (HCAL2*L1&L3) + (HCAL3*L2&L3)/1000 = __________kW. Example: (HCAL1*L1&L2) + (HCAL2*L1&L3) + (HCAL3*L2&L3) 1000 Measured Voltage: L1&L2 = 241 Volts...
- Page 61 Heating Mode Stop (Mechanical Heating Heat Pump) Adjust the heating setpoint to approximately two degrees below the current indoor temperature. The unit will sequence off, stop heating. Did the Compressor stop? ....................❒Yes ❒No Did the Condenser Fan (CFM) stop? ................❒Yes ❒No Did the indoor blower motor (IBM) Stop? ...............
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