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Installation & Operation Manual
Vertical Wall-Mount Heat Pumps
Single Stage Models:
MAH1020H • MAH1024H • MAH1030H
MAH1036H • MAH1042H • MAH1048H
2-Stage Models:
MAH2024H • MAH2030H • MAH2036H
MAH2042 •MAH2048H • MAH2060H
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.
MAH1060H
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 MAH Wall Mount HP Installation & Operation Manual
09/2024 New
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Table of Contents
Troubleshooting
Related Manuals for ACS Marvair MAH1020H
Summary of Contents for ACS Marvair MAH1020H
- Page 1 Heat Pump Product Manual Vertical Wall-Mount Heat Pumps Installation & Operation Manual Vertical Wall-Mount Heat Pumps Single Stage Models: MAH1020H • MAH1024H • MAH1030H MAH1036H • MAH1042H • MAH1048H MAH1060H 2-Stage Models: MAH2024H • MAH2030H • MAH2036H MAH2042 •MAH2048H • MAH2060H IMPORTANT This manual may include information for options and features which may not be included on the unit being installed.
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Page 2: How To Use This Manual
How To Use This Manual This manual is intended to be a guide to the Marvair Wall Mount family of vertical 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. -
Page 3: Table Of Contents
DANGER Failure to comply will result in death or severe personal injury and/or property damage. Failure to comply could result in death or severe personal injury and/or property dam- WARNING age. CAUTION Failure to comply could result in minor personal injury and/or property damage. Used to point out helpful suggestions that will result in improved installation, reliability IMPORTANT or operation. - Page 4 Chapter 4 - Start-Up 4.1 Check-Out of Cooling Cycle ........................ 38 4.2 Check-Out of Heating Cycle ......................... 39 4.3 Discharge Air Adjustment for Modulating Hot Gas Reheat (HGR) Valve ........... 39 4.4 Ventilation System Set Up ........................41 Chapter 5 - Troubleshooting 5.1 Overview ...............................
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Page 5: Chapter 1 - Description & Specifications 1.1 General Description
ables Table 1 CFM @ External Static Pressure ....................7 Table 2 Ship Weight ..........................7 Table 3 Filter Sizes ..........................7 Table 4 Refrigerant Charge........................7 Table 5 Ambient Temperature Operating Ranges .................. 7 Table 6 Room Size Limitations ......................7 Table 7 Minimum Clearances ...................... -
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 A = UV Light Unit Designation/Family S = Stock Unit D = Dry Bulb Sensor E = Dry Bulb Sensor w/Dirty Filter Energy Efficiency Ratio... -
Page 7: Air Flow, Weights, Filter Sizes, Refrigerant Charges And Ambient Operating Ranges
1.4 Air Flow, Weights, Filter Sizes, Refrigerant Charges and Ambient Operating Ranges External Static Pressure (WET COIL) Model Number 0.10 0.20 0.25 0.30 0.40 0.50 MAH1020H/1024H/2024H MAH1030H/2030H 1152 1122 1100 1075 1028 MAH1036H/2036H 1265 1222 1200 1175 1133 MAH1042H/2042H 1650 1585 1520 1450... -
Page 8: General Operation
1.5 General Operation Refrigerant Cycle Marvair heat pumps use R-454B 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. The warmed refrigerant gas enters the compressor where its temperature and pressure are increased. - Page 9 Configuration “D”: Two-Position Motorized Fresh Air Damper w/Pressure Relief Ventilation Control Board Logic: The 92589 control board allows the position of the “D” 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
that controls the speed of both blower motors simultaneously. As an option, a second fan speed controller can be factory installed for independent control of the exhaust air motor and positive pressurization of the classroom. Also, an optional filter on the exhaust air is available on selected models. Please consult your Marvair representative for details. -
Page 11: Energy Management System (Ems)
Single Point Feed When multiple internal disconnects are used, single point feed permits only one field power supply to heat pump. Field installed only. Available on all Marvair H/P units. Energy Management System (EMS) Relay to control the heat pump. Available in 24, 120 or 240 VAC. Field or factory installed. Electric Reheat for Dehumidification Control provides simultaneous operation of compressor when in cooling mode and the electric elements to provide dehumidification without over cooling the room. -
Page 12: 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 13: Installation And Replacement
I/O Table for Control Board 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 14 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 15 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 16 heat will operate. Note: SCKT and EHDD cannot both be set to the Y (yes) selection at the same time. SCKT takes priority over EHDD. 11. ODS Set: The ODS Set is used to set the Outdoor Sensor temperature for Heat-pump systems. When the system type is configured for Heat-pump (when setting 1 is set to HP), the ODS Set allows the outdoor sensor to be used to govern when electric heat is allowed to operate.
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Page 17: Operation
19. Dehum Supply Set: This setting allows the target setpoint for the supply air temperature during dehumidification operation. The setpoint range is adjustable from 70F to 75F with a fixed differential of 5F. The default setpoint is 72ºF 20. DS Calibration: This setting is used to calibrate the defrost sensor from 0º to -18ºF. 21. - Page 18 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)
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Page 19: Cooling Operation
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 20 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 21 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 22: 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 23: Heating Operation
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 24 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 – This section will describe the sequence of operation which takes place during Direct Expansion (DX) heating from a control standpoint.
- Page 25 heat and will only be allowed under certain conditions due to additional features that may be used. These features include the Outdoor Sensor and SCKT (safety circuit). See ODS and SCKT for more details. ODS - Outdoor Sensor (Heat-Pumps Only) The outdoor sensor only responds to the temperature of the outside air.
- Page 26 OFF fan cycle control and the PSC motor will not modulate. Note: A request for Y1 or Y2 vis digital input or Modbus takes priority over dehumidification operation and the hot gas reheat valve will de-energize. 5.2 Electric Reheat (if equipped) – When there is a request for “Dehumidification” (HUM-signal via Digital input or Modbus), this will result in the control board energizing the Indoor Fan (IBR), Compressor 1 (CC1), Compressor 2 (CC2), Reversing Valve (RV) “heat pumps only”...
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Page 27: Additional Features
of the other circuit providing that the circuits operate independently. The system will continue to lockout until the problem is rectified. 6.2 Low Pressure Lockout / Freeze Protection – A10K Nominal NTC Thermistor is connected to the “LPS 1” and “LPS2” inputs of the control board for circuit 1 and circuit 2 respectively. The sensor is secured to the common suction line of the system to monitor the suction line temperature. - Page 28 point. In the event that the Thermistor is disconnected, the controller reverts to the outdoor fan operating at the max speed setting selected on the control board configuration menu setting 7. Note: Systems with PSC outdoor motors utilize a fan cycle switch in the refrigeration circuit for on/off fan cycle head pressure control.
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Page 29: 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. 3.1 Equipment Inspection Concealed Damage Inspect all cartons and packages upon receipt for damage in transit. -
Page 30: Installation Requirements
3.3 Installation Requirements You must consider all of the following when choosing the installation site: 1. Noise. Install the unit so that the least amount of noise will be transmitted to inhabited spaces. 2. Condensate Drainage. Condensate produced during operation must be discharged to a suitable drain. 3. -
Page 31: Installation Materials
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 8 - Voltage Limitations 3.4 Installation Materials Installation Kits Marvair MAH Heat Pumps have built-in mounting flanges that function as side brackets. All models require and are shipped with a bottom mounting bracket. -
Page 32: Porting And Duct Work
Grilles: Description Size Marvair P/N For the MAH1020H/1024H & MAH2024H Double Deflection, Aluminum Supply Grille 20” x 8“ (509mm x 203mm) 80674 Aluminum Return Grille 20” x 12” (509mm x 305mm) 80677 Return Filter Grille 20” x 12” (509mm x 305mm) 80671 For the MAH1030H/1036H &... -
Page 33: Fresh Air Hood Adjustment
General Information 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 Marvair for additional assistance. ®... -
Page 34: Bracket Installation
Figure 4 - Fresh Air Hood Damper Adjustment 3.7 Bottom Bracket Installation 1. Remove and discard the 4 x 4 shipping boards attached to the base of the unit. 2. All heat pump models have built-in mounting flanges. See Figure 6. 3. -
Page 35: Mounting The Unit
3.8 Mounting the Unit 1. For wiring into the back of unit, locate the lower of the two knock-outs on the wall side of the Heat Pump. Drill a one inch hole in the building wall to match this opening. Allow sufficient clearance to run 3/4"... -
Page 36: High Voltage Wiring
High Voltage Wiring The power supply should have the proper voltage, phase, and ampacity for the selected model. 1. Refer to the electrical data on the data sticker on the unit for field wiring requirements of the unit. Size the incoming power supply lines and the fuse(s) or HACR breaker(s) according to requirements described in the National Electric Code. -
Page 37: Figure 6A Humidity Control Wiring Detail
3. If applicable, attach the thermostat assembly to the sub-base. Check the stage two heat anticipator setting. For units with electric heat and thermostats with an adjustable heat anticipator, energize the electric heat and measure the current on the lead attached to the W2 terminal. Adjust/set the heat anticipator per the instructions provided with the thermostat. -
Page 38: 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 39: Check-Out Of Heating Cycle
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 40: Figure 7 Temperature Sensor Wires - Modulating Hgr Valve
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 41: Ventilation System Set Up
4.4 Ventilation System Set-Up: GreenWheel ERV (Configuration H): ® Setting the correct air flow for the GreenWheel ERV requires a balometer and a screwdriver. a. Using best industry standards and practices, measure the fresh air that is being brought into the classroom. -
Page 42: 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 43: 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 44: 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 45: Electric Heat Controls
Display Displayed Faults AS-F Supply Air Sensor Fault (Sensor Disconnected Or Faulty) If Equipped DB-F Dry Bulb / Outdoor Sensor Fault (Sensor Disconnected Or Faulty) If Equipped DS-F Defrost Sensor Fault (Sensor Disconnected Or Faulty) Heat Pumps Only ES-F Enthalpy Sensor Fault (Sensor Disconnected Or Faulty) If Equipped Emergency Fan / Ventilation Active Loss of Refrigerant / Flat Unit Fault LP-1... -
Page 46: 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 47: Figure 10A Typical 1Ø Electrical Schematic Diagram Heat Pump With Manual Outside Air Damper
Figure 10a - Typical 1ø Electrical Schematic Diagram Heat Pump (Models MAH) with Manual Outside Air Damper Marvair MAH Wall Mount HP Installation & Operation Manual 09/2024 New... -
Page 48: Figure 10B Typical 208/230V. 3Ø Heat Pump Electrical Schematic Diagram
Figure 10b - Typical 208/230v. 3ø Electrical Schematic Diagram Heat Pump (Models MAH) Marvair MAH Wall Mount HP Installation & Operation Manual 09/2024 New... -
Page 49: 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 MAH, with the PC Control Board Marvair MAH Wall Mount HP Installation & Operation Manual 09/2024 New... -
Page 50: Scheduled Maintenance
Chapter 7 Maintenance 7.1 Scheduled Maintenance Repair and maintenance to electrical components shall include initial safety checks and component inspection procedures. If a fault exists that could compromise safety, then no electrical supply shall be connected to the circuit until it is satisfactorily dealt with. If the fault cannot be corrected immediately but it is necessary to continue operation, an adequate temporary solution shall be used. -
Page 51: Chapter 8 Service & Charging/Recovery
Chapter 8 Service & Charging/Recovery Safety Precautions Service Prior to beginning work on systems containing FLAMMABLE REFRIGERANTS, safety checks are necessary to ensure that the risk of ignition is minimized. For repair to the REFRIGERATING SYSTEM, the following shall be completed prior to conducting work on the system. 1. -
Page 52: Charging Procedures
Charging Procedures In addition to conventional charging procedures, the following requirements shall be followed. 1. Ensure that contamination of different refrigerants does not occur when using charging equipment. Hoses or lines shall be as short as possible to minimize the amount of refrigerant contained in them. 2. - Page 53 9. When transferring refrigerant into cylinders, ensure that only appropriate refrigerant recovery cylinders are employed. Ensure that the correct number of cylinders for holding the total system charge is available. All cylinders to be used are designated for the recovered refrigerant and labelled for that refrigerant (i.e.
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Page 54: Chapter 9 Decommissioning
Chapter 9 Decommissioning Decommissioning Before carrying out this procedure, it is essential that the technician is completely familiar with the equipment and all its details. It is recommended good practice that all refrigerants are recovered safely. Prior to the task being carried out, an oil and refrigerant sample shall be taken in case analysis is required prior to re-use of recovered refrigerant. -
Page 55: Chapter 10 - Warranty Information 10.1 Standard Product Warranty
Chapter 10 Warranty 10.1 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 56: Appendix A: Electronic Control Board Modbus Map
APPENDIX A: Electronic Control Board Modbus Map Default Modbus RTU Settings Slave ID Baud = 19200 Data Bits = 8 Stop Bits = 1 Parity = None First Coil 1 , No. of Coils 30 RJ11 Pinout for Communication Discrete Bit/Bool: Read with Function Code 02 multi discrete input read, Write to RW coil with Function Code 05 Single Coil write. - Page 57 Registers: Read with Function Code 04 Multi register reads, Write to RW register with Function Code 06 write single register. Attempted Writes to RO registers result in error return. Func 0x10 multiple register writes not supported. MODBUS Human OBI PACKET Register ID REGISTER ZeroBase...
- Page 58 40020 Current Status of MIN POS 16 bit 20 = MIN, 20-100= OPEN % 40021 Economizer Dry Bulb Temperature setpoint 16 bit 70F=default, 20F-105F 40022 ODS set 16 bit 50 default, 0-70 N= 0, 10-90 SECONDS, 40023 Fan Purge 16 bit 90 SEC IS DEFAULT 40024 Defrost Timer...
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Page 59: Appendix B: Installation Instructions For Field Installed Electric Heat
APPENDIX B: 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 60 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 61 Marvair MAH Wall Mount HP Installation & Operation Manual 09/2024 New...
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Page 62: Appendix C: Heat Pump Start-Up - Commissioning Checklist
APPENDIX C: Heat Pump Start-Up - Commissioning Checklist Please complete the information on this form and email to MarvairCustServ@airxcs.com. Date: _____/_____/_______ Owner & Location Equipment Owner: ___________________________________________________________________ Address: __________________________________________________________________ City: __________________________________________________________________ State:_______, Zip:____________ Installing Contractor Company: _______________________________Installer: ____________________________ Address: __________________________________________________________________ City: __________________________________________________________________ State:_______, Zip:____________ Equipment Information... -
Page 63: Starting Unit
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 64 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 65 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 66 Electric Reheat Re-Start While the system is still operating in “Cooling Mode” from the previous test. Re-Start Dehumidification. Do Not change the Humidity Setpoint on the Humidistat. Simply adjust the cooling setpoint to approximately four degrees above the current indoor temperature. After the short delay, the unit will sequence on, start dehumidification.
- Page 67 Economizer Cooling Stop Adjust the cooling setpoint to approximately two degrees above the current indoor temperature. The unit will sequence off. Is the Economizer Damper Closed? .................. ❒Yes ❒No Is the indoor blower motor (IBM) Off? ................❒Yes ❒No Heating Mode (Mechanical Heating Heat Pump) Close the Compressor (Cooling) circuit breaker.
- Page 68 Mechanical Heat Lockout ODT (Electric Heat ONLY While the system is operating in “Mechanical Heating Mode”. Activate Mechanical Heat Lockout (ODT). * Your unit may be configured with an outdoor thermostat configured as “Auxiliary Heat”, “Mechanical Heat Lockout”, or No outdoor thermostat. * Do Not change the temperature setpoint on the thermostat / control.
- Page 69 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 Measured Amperage: L1 = 8.28 Amps 1995.48 Measured Voltage: L1&L3 = 243 Volts Measured Amperage: L1 = 8.22 Amps 1997.46 Measured Voltage: L1&L2 = 235 Volts Measured Amperage: L1 = 8.57 Amps...
- Page 70 Notes: ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ Marvair MAH Wall Mount HP Installation & Operation Manual 09/2024 New...
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