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ACS Marvair MGA3090A, Руководство по установке и эксплуатации

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Marvair MGA3090-3180 Wall Mount AC I&O Manual 05/2023 Rev.14

1.9  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 drives liquid refrigerant from the crankcase and prevents loss of lubrication 

caused by oil dilution. Power must be applied to the unit for 24 hours before starting the compressor. 
The condenser (outside fan) motor is energized by the same contactor. 
The indoor evaporator fan motor is controlled by the fan purge on the electronic control board.

Содержание Marvair MGA3090A

Страница 1: ...ide of the building adjacent to the thermostat END USER Retain this manual for future reference Manufactured By Marvair An ACS Brand P O Box 400 Cordele Georgia 31010 156 Seedling Drive Cordele Georgi...

Страница 2: ...TRANSPORT the UNIT UPRIGHT 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 in...

Страница 3: ...cent to the thermostat END USER Retain these instructions for future reference Table of Contents Chapter 1 Air Conditioner Description Specifications 1 1 General Description 5 1 2 Model Identification...

Страница 4: ...ting Detail 38 Figure 7a Humidistat Wiring to a Marvair Air Conditioner with Reheat 40 Figure 7b Thermostat Connection Diagram 41 Figure 7c CommStat 4 Wiring Detail 41 Tables Table 1 Efficiency and Ca...

Страница 5: ...ols The control board and PLC consolidate several of the electrical components improves the air conditioner s reliability and has LED s to indicate operating status and fault conditions to assist the...

Страница 6: ...ter 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 L...

Страница 7: ...9 037 38 503 37 970 37 438 36 908 36 392 36 122 35 901 35 681 35 073 MGA3120A 72 61 22 16 Total 61 242 59 118 57 053 54 929 52 805 50 681 48 557 46 492 45 430 44 368 43 306 42 244 Sensible 61 242 59 1...

Страница 8: ...18 92 033 90 966 89 904 88 845 87 790 76 63 24 17 Total 157 606 152 202 146 651 141 247 135 842 130 438 125 033 119 483 116 854 114 224 111 595 108 966 Sensible 115 990 113 761 111 489 109 294 107 115...

Страница 9: ...508 x 51 92365 3 8 Economizer Pre filter 9 25 x 37 x 375 235 x 940 x 10 92127 1 N A MGA3120A MGA3150A Exterior Access Return Air Filter 25 x 16 x 2 635 x 406 x 51 80137 3 8 Interior Access Return Air...

Страница 10: ...r operation is desired the factory installed jumper between terminals 1 and 2 of the low voltage terminal strip must be removed The 1st stage cooling input is terminal 1 of the low voltage terminal st...

Страница 11: ...compressor and fans will also de energize PMF Phase monitor fault to monitor phase operation for 3 phase systems light is on when 3 phase power is powered and connected correctly PLC Outputs The PLC...

Страница 12: ...urned off the alarm output is energized and the status LED s will blink to indicate which fault has occurred If there is a call for air flow the indoor blower will remain energized When the lockout co...

Страница 13: ...ts and sheet metal Note the internal sheet metal which is insulated and the internal control box are not coated Dirty Filter Indicator Adiaphragm type of indicator measures the air pressure on either...

Страница 14: ...l PTC crankcase heater that functions as long as primary power is available The heater drives liquid refrigerant from the crankcase and prevents loss of lubrication caused by oil dilution Power must b...

Страница 15: ...3 Rev 14 RELAY OUTPUTS X12 DQ a 1L 0 1 2 3 4 2L 5 6 7 0 1 DQ b CPU 1215C DC DC RLY L M X12 24VDC 24VDC L M 1M 0 1 2 3 4 5 6 7 0 1 2 3 4 5 2M 0 1 Dl a Dl b 24VDC INPUTS 3M 0 1 X11 AQ ANALOG OUTPUTS INP...

Страница 16: ...rmation 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 contro...

Страница 17: ...23 Control Board Power Indicator LED 2 2 Installation and Replacement The PCB is factory installed To install a replacement PCB use the six mounting holes along with the appropriate screw size to fir...

Страница 18: ...off delay in seconds 4 IBM Y1 Set 80 40 100 G Fan only and Y1 1st Stage Cooling Indoor Blower Speed Setting 5 IBM Y2 Set 100 40 100 Y2 2nd Stage Cooling Indoor Blower Speed Setting 6 OFM Select P P dC...

Страница 19: ...sureorhigh pressurelockout 6 OFM Select This setting allows the IBM Indoor Blower control signal to be configured for PWM or 0 10vdc control The default control output signal is PWM 7 OFM Set This is...

Страница 20: ...ill default to compressor cooling if any sensor becomes disconnected or faulty ChangingtheECONOSelecttoN no willdisableeconomizeroperationandtheeconomizer function will be ignored 13 SensorType Thisse...

Страница 21: ...ftware Version Number The software version of the 92589 control board will be displayed on the seven segment display This is for informational purposes only 2 4 Operation Power The Marvair PCB require...

Страница 22: ...Pumps 5 0 Dehumidification Operation AC HP 5 1 Hot Gas Reheat 5 2 Electric Reheat 6 0 Refrigeration Protection 6 1 High Pressure lockout 6 2 Low Pressure Lockout Freeze Protection 6 3 Anti Short Cycl...

Страница 23: ...ity This means that in any combination involving the G input the speed associated to Fan Only will never take precedence The priority list from Highest to Lowest goes as follows 1 Y2 Request 2 Y1 Requ...

Страница 24: ...l the switch reopens at 290 PSIG These outputs function as described until the Cooling setpoint is satisfied This is considered as ON OFF fan cycle control and the PSC motor will not modulate Note Sin...

Страница 25: ...ed since Y2 has higher priority These outputs remain energized until the cooling setpoint is satisfied Once the setpoint is satisfied the Compressor and the Outdoor fan outputs are de energized The In...

Страница 26: ...g the testing of the air conditioner at the factory the control board has been configured for the sensor type used in the system There should be no need to change the sensor configuration If an enthal...

Страница 27: ...nd provides a signal to the economizer controller for modulating the position of the damper The default supply air temperature is 55F in economizer cooling and is not adjustable A disconnected or faul...

Страница 28: ...tiate a defrost cycle based on the time selected in the control board configuration menu setting 8 The defrost time intervals selections are 30 60 and 90 minutes and the factory default setting is 30...

Страница 29: ...remain off as long as the request for W2 is active Once the request for W2 satisfies the compressor will be allowed to operate The default setting for SCKT is N No the electric heat and compressor wil...

Страница 30: ...erature 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...

Страница 31: ...ecting it from excessive short cycling When the compressor goes off due to any fault emergency or if the cooling heat pump heating setpoint is satisfied a built in 3 minute timer locks the compressor...

Страница 32: ...odbus and the system will operate in normal cooling mode until the request for FC is satisfied Once satisfied the system will be allowed to return to economizer operation if conditions are favorable 7...

Страница 33: ...rimary power turned on 2 Attempt to start the compressor after 24 hours 3 If the compressor will not start makes excessive noise or will not pump return the unit to the freight carrier 3 2 Installatio...

Страница 34: ...cm 24 inches 61 cm 120 inches 305 cm MGA3120A MGA3150A MGA3180A Table 10 Minimum Clearances 6 Codes Make sure your installation conforms to all applicable electrical plumbing building and municipal c...

Страница 35: ...cinstallationconditions Theinstallationoftheairconditioner to the building must take in to account all of these factors and follow best industry practices to provide a safe and secure attachment to th...

Страница 36: ...National Fire Protection Association Standards 90A and 90B before designing and installing duct work The duct system must be engineered to insure sufficient air flow through the unit to prevent over h...

Страница 37: ...iring into the back of unit locate the lower of the two knockouts on the wall side of the unit Drill a one inch hole in the shelter wall to match this opening Allow sufficient clearance to run 3 4 con...

Страница 38: ...units 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 Scrollcompressors likesevera...

Страница 39: ...y cause serious injury and damage the panel DANGER NEVER open all four hinges simultaneously The panel should ONLY be opened by using the two hinges on the left side OR the two hinges on the right sid...

Страница 40: ...ubbase assembly See Figure 4a for connections to various thermostats 2 Mount the thermostat on the wall of the shelter The thermostat should be located so that the supply air from the unit does NOT bl...

Страница 41: ...m e o t n i m e t s y s e h t s e c r o f t u p t u o R A M e h T s r e z i m o n o c e h t i w s m e t s y s n o d e s u y l n o s i R A M l a n i m r e t 4 t a t S m m o C e h T 4 t l u a f n e g o...

Страница 42: ...Nothing should operate at this time 3 Set the time delay in the control box to three minutes See Section 1 6 4 Slowly lower the thermostat s cooling set point temperature until the switch closes The...

Страница 43: ...ng transportation However the great majority of problems result from installation errors If you experience difficulties with the unit please review the installation steps in Chapter 2 Much time can be...

Страница 44: ...n 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 spe...

Страница 45: ...mpressor to see if it has overheated If it is hot the internal overload may be open You may have to wait several hours for it to reset 3 MotorWinding Resistances Using a digital volt ohm meter VOM mea...

Страница 46: ...ged door or from the return grille on the inside of the building Evaporator If the evaporator becomes clogged or dirty it may be cleaned by careful vacuuming or with a com mercial evaporator cleaning...

Страница 47: ...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 ca...

Страница 48: ..._____________ Address ________________________________________State________________________ City ___________________________________________ Marvair Air conditioner Model No __________________________...

Страница 49: ...olts L1 L2_______V L1 L3 ________V L2 L3______V L1 L2 L1 L3 L2 L3 3 Avg Voltage _______________ Max Deviation from avg voltage ______________volts Voltage imbalance 100 x Max Deviation avg Voltage ___...

Страница 50: ...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_____...

Страница 51: ...______________________________________________________________ _________________________________________________________________________ _______________________________________________________________...

Страница 52: ...SCALE DRAWN BY APPROVED BY TITLE DATE DRAWING NUMBER TOLERANCES EXCEPT AS NOTED DECIMAL FRACTIONAL ANGULAR This drawing contains confidential information of Marvair a Division of AIRXCEL Inc This inf...

Страница 53: ...he bottom front panel To access the hood remove the screws that hold the front panel The air flow can be adjusted from no 0 fresh air to approximately 15 of rated air flow of fresh air in 5 increments...

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