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Marvair MAA/MGA Wall Mount AC Installation & Operation Manual

09/2021 Rev.15

43

Chapter 5 Troubleshooting

5.1 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.

However, the great majority of problems result from installation errors.
If you experience difficulties with your unit, please review the installation steps in Chapter 2.
Much time can be saved by taking a thoughtful and orderly approach to troubleshooting. Start with a

visual check - are there loose wires, crimped tubing, missing parts, etc? Begin deeper analysis only

after making this initial inspection.
The troubleshooting information in this manual is basic. The troubleshooting section contains problem/

solution charts for general problems, followed by a compressor section.
Not every problem can be anticipated. If you discover a problem that is not covered in this manual, we

would be very grateful if you would bring it to the attention of our service department for incorporation

in future revisions.
As always, please exercise caution and good judgement when servicing the unit. Use only safe and

proven service techniques. Use refrigeration goggles when servicing the refrigeration circuit.

WARNING

The refrigerant circuit has hot surfaces, and the electrical voltages inside of

the unit may be hazardous or lethal. SERVICE MAY BE PERFORMED ONLY BY

QUALIFIED AND EXPERIENCED PERSONS.

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Содержание Marvair MAA1018

Страница 1: ...n of this manual can be found at www Marvair com IMPORTANT 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 ...

Страница 2: ...RIGHT Laying it down on its side may cause oil to leave the compressor and breakage or damage to other components 3 TURN ELECTRICAL POWER OFF AT THE breaker or fuse box BEFORE installing or working on the equipment LINE VOLTAGES ARE HAZARDOUS or LETHAL 4 OBSERVEandCOMPLYwithALLapplicablePLUMBING ELECTRICAL andBUILDINGCODESandordinances 5 SERVICE may be performed ONLY by QUALIFIED and EXPERIENCED P...

Страница 3: ...ons on the inside of the building adjacent to the thermostat END USER Retain these instructions for future reference Table of Contents Chapter 1 Marvair Wall Mount Air Conditioner Description Specifications 1 1 General Description 5 1 2 Model Identification 6 1 3 Serial Number Date Code 7 1 4 Air Flow Weights and Filter Sizes 7 1 5 General Operation 7 1 6 Optional Controls and Packages 8 1 7 Elect...

Страница 4: ...s 19 Figure 4 Electrical Controls HVESAAlternate Construction 19 Figure 5 Economizer Control Board 20 Figure 6a Setting the Speed for the Y1 and Y2 Operation for Indoor Motor 23 Figure 6b Second Stage Cooling Speed 23 Figure 7 Output Termination for Indoor Motor Control Signal 24 Figure 8 Outdoor Motor Speed Setting 24 Figure 9 Output Termination for Outdoor Motor Control Signal 24 Figure 10 Commu...

Страница 5: ...ix A for instructions on field installation of electric heat Marvair air conditioners feature an exclusive electronic control board The control board consolidates several of the electrical components and improves the air conditioner s reliability The control board replaces the blower relay the lockout relay the compressor time delay and the timed low pressure bypass In addition the control board h...

Страница 6: ...art w Low Ambient CCH Q Hard Start w Low Ambient Fan Cycle Control FCC R Crank Case Heater CCH T Hard Start w EFS U Hard Start w Hot Gas Bypass V Hard Start w Low Ambient CCH EFS W Low Ambient w CCH X Hot Gas Bypass Y Low Ambient w CCH FCC Z Low Ambient w CCH EFS 1 Low Ambient w FCC 2 Low Ambient w FCC EFS 3 CCH w Hot Gas Bypass None Special 17 Indoor Air Quality Features D Dry Bulb Sensor E Dry B...

Страница 7: ...RATING MAA1018 14 x 12 1 356 x 305 x 25 P 80122 1 N A MAA1020 1024 16 x 25 x 2 406 x 635 x 51 80137 1 8 MAA1024 1030 1036 B2 INTERNAL 16 x 30 x 1 406 x 762 x 25 80136 1 N A MAA1024 B2 RETURN GRILLE 11 x 19 x 1 292 x 495 x 25 91983 1 N A MAA1030 1036 MAA2072 18 x 30 x 2 457 x 762 x 51 93184 1 8 MAA1030 1036 B2 RETURN GRILLE 27 x 13 x 1 699 x 343 x 25 80769 1 N A MAA1042 1048 36 x 22 x 2 927 x 559 x...

Страница 8: ...foutside air into the enclosure when the outdoor air conditions are suitable to reduce the need for mechanical cooling save energy and extend compressor life Depending upon the options selected the damper responds to the enthalpy of the outdoor air On a call for cooling from a space thermostat it operates as follows When the enthalpy of the outdoor air is below the set point the outdoor air damper...

Страница 9: ...nance Imaging MRI buildings to prevent magnetic voltage disturbance caused by compressor cycling Two hot gas bypass option packages are available to allow operation to 20 F 7 C or minus 20 F 29 C Please refer to Hot Gas Bypass Application Bulletin for details Electric Reheat Dehumidification Ahumiditycontrollerallowselectricheatandcoolingtooperatesimultaneously Marvair airconditioners equipped wit...

Страница 10: ...ves performance in hot ambient temperatures High Filtration Selected units are built with larger blowers motors for use with higher efficiency filters with MERV ratings of 11 13 and 14 when tested to ASHRAE 52 2 Units with economizers have a pre filter on the outside air Lockable Disconnect Access Cover Plate The access plate to the service disconnect switch can be equipped with a lockable cover C...

Страница 11: ...eel Two stainless steel cabinet constructions are available the complete cabinet including most internal sheet metal or only the exterior sheet metal 1 7 Electrical Operation The compressor and condenser fan are energized with a contactor controlled by a 24 VAC pilot signal Some compressors incorporate an internal PTC crankcase heater that functions as long as primary power is available The heater...

Страница 12: ...12 Marvair MAA MGA Wall Mount AC Installation Operation Manual 09 2021 Rev 15 Figure 1a Typical Electrical Schematic Non Economizer Model MAA ...

Страница 13: ...Marvair MAA MGA Wall Mount AC Installation Operation Manual 09 2021 Rev 15 13 Figure 1b Typical Electrical Schematic Economizer Model MAA ...

Страница 14: ...14 Marvair MAA MGA Wall Mount AC Installation Operation Manual 09 2021 Rev 15 Figure 1c Typical Electrical Schematic Economizer Model MAA Alternate Construction ...

Страница 15: ...Marvair MAA MGA Wall Mount AC Installation Operation Manual 09 2021 Rev 15 15 Figure 1d Typical Electrical Schematic Economizer Model MAA Alternate Construction ...

Страница 16: ...16 Marvair MAA MGA Wall Mount AC Installation Operation Manual 09 2021 Rev 15 Figure 1e Typical Electrical Schematic Economizer Model MAA Alternate Construction ...

Страница 17: ...de the changeover to outside air for free cooling The control board must be configured for proper operation of the economizer by selecting the desired changeover temperature The desired temperature is selected by four dip switches on the board See item 9 in Figure 4 for the location of the dip switches 1 Selecting the set point for the enthalpy sensor On the board there are four dip switches 1 2 3...

Страница 18: ...amper Minimum Position Potentiometer W2 jumper The potentiometer controls the amount of outside air introduced in the building when the economizer damper closes or the air conditioner is Off or in Mechanical Cooling The factory setting is for the damper to close completely when the unit is off or in Mechanical Cooling Pins 1 2 are jumpered If outside air is desired during mechanical cooling or whe...

Страница 19: ...sorsarecurrentlytheonlybrandofsensorsusedintheairconditioners Jumper W3 allows us to use alternative brands at a future date On all current air conditioners pins 1 2 are jumpered on W3 See item 4 in Figure 4 Figure 3 Enthalpy Sensor Temperature Control Points Marvair Economizer Controller Figure 4 Electrical Controls MAA Alternate Construction ...

Страница 20: ... Position Potentiometer 0 to 100 Factory setting is 50 2 Field connection from CommStat 4 2 terminal 5 For Honeywell sensors 8 W2 Minimum Position Potentiometer Jumper Jumper Pins 1 2 to Disable Factory setting Jumper pins 2 3 to Enable 3 Field connection from CommStat 4 MAR terminal 6 For Prism sensors 9 Enthalpy Dip Switches Set points are same as previous Honeywell controller Factory setting is...

Страница 21: ...ting valuable information to the end user Special features include 2 Stage operation with varying speed control to optimize latent and sensible capacity built in remote communication MODBUS for monitoring and or control optimized head pressure control and the ability to function autonomously without the need for an off the shelf thermostat The MarvairPCBcomesequippedwithLEDstomonitorlockoutsforind...

Страница 22: ...High Pressure Switch LP Low Pressure Switch Switch to Be Closed for Cooling Operation Switch to Be Connected to R Node 16 24 VAC Power Input to PCB 17 Digital Outputs 24 VAC The PCB Makes and Breaks R RH Reheat EH Electric Heat CC 1 2 Compressor Respectively 18 Alarm Contacts 2 2 Installation and Replacement The PCB is factory installed To install a replacement PCB use the six mounting holes along...

Страница 23: ...appropriate signal terminations must be used This jumper will be factory installed In replacing the PCB verify the necessary signal and configure the board accordingly Only 2 of the 3 pins should be used for the necessary configurations DO NOT CONNECT ALL 3 PINS 4 1 2 3 1 Set for 0 10V Signal Jumper To Remain On The Appropriate Terminal For Correct Operation 2 Set For PWM Signal Jumper To Remain O...

Страница 24: ...y the potentiometer See figure below 3 1 2 1 Set for 0 10V Signal Jumper To Remain On The Appropriate Terminal For Correct Operation 2 Set For PWM Signal Jumper To Remain On The Appropriate Terminal For Correct Operation 3 Outdoor Motor Speed Potentiometer Figure 8 Outdoor Motor Speed Setting Output Termination for Outdoor Motor Control Signal Note Follow data wiring and signal control signal type...

Страница 25: ...bits per second The board also allows 15 different MODBUS addresses based on the position of the NET ADDRESS DIP switches The Net Addresses are written in Binary see table below with switch 4 being the least significant bit THE NUMBERS ONTHE DIPSWITCHES DO NOT CORRELATE TO MODBUS ADDRESSES The figure below shows the positions of the various components necessary to set up communication on the on th...

Страница 26: ...mendedcommissioning startupsequence to ensure safety and system reliability This document is only valid if the system is used as intended This section defines the manner and method of control of the HVAC system It will cover the following operations and protections 1 0 Blower Operation 2 0 Cooling Operation 2 1 Mechanical Cooling 2 1 1 Partial Capacity 50 60 2 1 2 Partial Capacity 50 2 1 3 Full Ca...

Страница 27: ...oes as follows 1 Stage 2 Cooling Request Y2 Input 2 Stage 1 Cooling Request Y1 Input 3 Electric Heat Request W2 Input 4 Dehumidification Request Hum Input 5 Indoor Fan Request G Input Note The priority list above also describes the operation that takes precedence in the event that there is a request for all operations or a combination of operations The controller will NOT energize the compressor o...

Страница 28: ... capacity Only CC1 output can achieve partial capacity Both CC1 and CC2 outputs are required to achieve full capacity Request Active Input Active Output Stage 1 Cooling 1 Fixed Compressor Y1 CC1 Partial Capacity Stage 1 Cooling 2 Fixed Compressors Y1 or Y2 CC1 or CC2 Respectively Partial Capacity Stage 1 Cooling 1 Staged Compressor Y1 CC1 Partial Capacity Stage 2 Cooling 2 Fixed Compressors Y1 Y2 ...

Страница 29: ...he cooling operation In the event that the fault occurs a second time on the same call for cooling the system locks out To clear the fault the Cooling request must be cycled or the system must be power cycled Status LEDs with associated flash codes or designated MODBUS values can be monitored to verify this fault The system will continue to lockout unit the problem is rectified 5 3 Low Voltage In ...

Страница 30: ...the sensor has to be configured via MODBUS Once configuration is complete the unit has the capability to function autonomously to maintain the space temperature Discrete Registers Read with Function Code 02 Write to RW or WO registers with Function Code 05 ID Description Size Data Format R W 1 Current Status of the Y1 Compressor Call 1 Bit 0 no call 1 call RW 2 Current Status of the Y2 Compressor ...

Страница 31: ...Setting 16 Bit 1 60 default 25 represents minutes of allowed MODBUS inactivity before switching to onboard T Stat mode RW 10 Current OFM Speed 16 Bit 0 1023 RO 11 Current IFM Speed 16 Bit 0 1023 RO 12 Anti Short Cycle Compressor 1 16 Bit 0 360 0 5 sec per step RO 13 Anti Short Cycle Compressor 2 16 Bit 0 360 0 5 sec per step RO 14 Voltage Reading 16 Bit 0 1023 1023 Greater than 20V 965 18V cutoff ...

Страница 32: ...mpressor will not start makes excessive noise or will not pump return the unit to the freight carrier 3 2 Installation Requirements General 1 Inspect unit for completeness Check for missing parts e g hardware Refer to the installation kit information in section 2 3 2 Remove access panels and check for loose wires Tighten screw connections 3 Complete and mail the warranty registration card You must...

Страница 33: ...6 cm 24 inches 61 cm 6 inches 15 cm 1030 1036 30 inches 76 cm 18 inches 46 cm 24 inches 61 cm 6 inches 15 cm 1042 1048 1060 2060 30 inches 76 cm 30 inches 76 cm 24 inches 61 cm 6 inches 15 cm 1072 2072 30 inches 76 cm 30 inches 76 cm 12 inches 31 cm 6 inches 15 cm Table 8 Minimum Clearances 6 Codes Make sure your installation conforms to all applicable electrical plumbing building and municipal co...

Страница 34: ...fan Non volatile program memory P N 50107 Grilles Wall Sleeves Supply Grilles For MAA1018A 17 x 5 432 mm x 127 mm P N 80682 For MAA1020A MAA1024A MAA1024A B2 20 x 8 508 mm x 203 mm P N 80674 For MAA1030A MAA1030A B2 MAA1036A MAA1036A B2 28 x 8 711 mm x 203 mm P N 80675 For MAA1042A MAA1048A MAA1060A 30 x 10 762 mm x 254 mm P N 80676 For MAA1060A MGA1702A Reverse Flow 30 x 16 762 mm x 406 mm P N 93...

Страница 35: ...this manual is intended for use by a qualified service agency that is experienced in such work is familiar with all precautions and safety procedures required in such work and is equipped with the proper tools and test instruments 3 4 Porting and Duct Work General Information Note The following instructions are for general guidance only Due to the wide variety of installation possibilities specifi...

Страница 36: ...et 122cm of the unit Galvanized metal duct extensions should be used to simplify connections to duct work and grilles Use fabric boots to prevent the transmission of vibration through the duct system The fabric must be U L rated to a minimum of 197 F 92 C Minimum Airflow Requirements The duct system must be engineered to assure sufficient air flow through the unit even under adverse conditions suc...

Страница 37: ...d on the wall You must stabilize the unit on the bracket with the lifting device or by some other means the bracket alone is not sufficient 3 Make sure that the duct flanges are properly aligned with the wall opening Adjust as necessary 4 Note the holes in each side flange Using the holes for guides drill holes through the wall with a 3 8 drill bit Insert the 3 8 x 5 bolts through the flanges Inst...

Страница 38: ...ained system with small critical refrigerant charges where the installation of gauges may be objectionable can be made by monitoring the temperature of the refrigerant lines at the compressor The temperature should rise 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 ...

Страница 39: ...leads connected to the internal circuit breaker on one of the units only D Restore power and retest the phase step B When the voltage reads 0 the units are in phase E Turn off power and proceed Low Voltage Wiring IMPORTANT The following instructions are generic wiring instructions and may not be applicable for air conditioners with various options Always refer to the wiring diagram in the air cond...

Страница 40: ...undant air conditioning system for a telecommunication cabinet or shelter The CommStat 3 Controller is factory programmed with standard industry set points to facilitate installation If desired each of the set points can be quickly and easily changed in the field by the installer It can be used with Marvair s unique vertical packaged wall mount air conditioners or other environmental control units...

Страница 41: ... C NO High Building Temp Alarm Dry Contacts NC C NO 5 Connect to Normally Closed NC dry contacts from smoke alarm SMOKE ALARM JUMPER NOTE IF LINE VOLTAGE IS BELOW 220 VAC USE THE 208 TRANSFORMER TAP 1 24 VAC connections only 2 For immediate shutdown of air conditioner upon a signal from the smoke alarm the jumper between terminals 8 and 10 in the ComPac I and ComPac II units must be removed and a ...

Страница 42: ...onomizer Equipped models only To check the system operation under different ambient conditions the air temperature and enthalpy sensors must be tricked When outdoor ambient condi tions are higher than the control setting a component cooler aerosol may be sprayed directly into the enthalpy sensor to simulate low enthalpy conditions causing the economizer damper to open Alternately when outdoor cond...

Страница 43: ... Start with a visual check are there loose wires crimped tubing missing parts etc Begin deeper analysis only after making this initial inspection The troubleshooting information in this manual is basic The troubleshooting section contains problem solution charts for general problems followed by a compressor section Not every problem can be anticipated If you discover a problem that is not covered ...

Страница 44: ...striction in refrigerant circuit 2 Check for blockage or restriction especially filter drier and capillary tube assembly 3 Refrigerant overcharge following field service 3 Evacuate and recharge to factory specifications 4 Defective pressure control 4 Checklimitcutoutpressures Controlissettoactuateat approximately60 PSIG lowpressure and650PSIG high pressure D Unit blows fuses or trips circuit break...

Страница 45: ...tal tube and to each compressor terminal to test the motor windings A short circuit at high voltages indicates a motor defect Do not do this test under vacuum 5 On single phase models check the capacitor by substitution 5 4 Control Board Diagnosis The control board see section 1 6a for a complete description of the control board has a red diagnostic LED which indicates the lockout fault The contro...

Страница 46: ... has dried before restarting Condenser Periodicallyinspecttheoutdoorcondensercoilandthecabinetairreliefsfordirtorobstructions Remove foreign objects such as leaves paper etc If the condenser coil is dirty it may be washed off with a commercial solvent intended for this purpose TURN OFF POWER BEFORE CLEANING Be sure that all electrical components are thoroughly dry before restoring power Use a fin ...

Страница 47: ...t or any other material charges 2 Damages caused by shipping accident abuse negligence misuse fire flood or Acts of God 3 Damages caused by operating or staging the unit in a corrosive environment 4 Damages caused by improper application of the product 5 Damages caused by failing to perform proper routine maintenance 6 Expenses incurred for erecting disconnecting or dismantling the product or inst...

Страница 48: ..._______________________________ Compressor Model No ______________________________________________ Serial No ______________________________________________ B Pre Start Up Is there any shipping damage Yes No If so where ________________________________________________________________ Will this damage prevent starting the unit Yes No Check Power Supply does it agree with data sticker on air conditio...

Страница 49: ...x Deviation from avg voltage ______________volts Voltage imbalance 100 x Max Deviation avg Voltage ___________ A voltage deviation greater than 2 with the unit running should be addressed and corrected Excess voltage deviation can cause the compressor to overheat and to operate inefficiently Example Maximum Deviation from Average Voltage X 100 for Percent Average voltage Measured Voltages L1 L2 24...

Страница 50: ...Air DB Temp ________ ________ Evap Leaving Air WB Temp ________ ________ Heater Contactor Amps L1 ________ ________ Heater Contactor Amps L2 ________ ________ Heater Contactor Amps L3 ________ ________ E Cooling Mode Check Record Refrigerant Pressures Recheck voltage imbalance in cooling mode Measured Line to Line Volts L1 L2_______V L1 L3 ________V L2 L3______V L1 L2 L1 L3 L2 L3 3 Avg Voltage ___...

Страница 51: ...___ Compressor Amps L3 ________ ________ Notes _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________...

Страница 52: ...ce on all four sides of the supply outlet duct flange on the unit 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 Ducting Extensions should be cut flush with the inside wall for applica...

Страница 53: ...for all other heaters 6 Install the two No 10 screws in the heater assembly plate 7 Install wire harness in hole provided in drain pan and then through filter bracket and then into control box 8 Wire the heater as shown in the wiring diagram provided with the heater kit the insulated terminal ends are to be connected at the heater 9 Install pop tie in appropriate hole in back panel to secure wire ...

Страница 54: ...54 Marvair MAA MGA Wall Mount AC Installation Operation Manual 09 2021 Rev 15 ...

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