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Marvair Wall Mount Heat Pump I&O Manual

06/2023 Rev.7

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. After the short delay, the unit will

activate Auxiliary Heat, start heating with Both Mechanical heat and Electric heat. Notice: system did

not turn off. The Only change that occurred is “Electric Heat” turned On.

Note: The “S” Circuit (Mar-

vair Heat Pump control board) must be set to “No”, to allow Auxiliary Heat.



Is the indoor blower motor (IBM) On? .............................................................................

❒

Yes

❒



Is the Compressor On? ......................................................................................................

❒

Yes

❒



Is the Condenser Fan (CFM) On? .....................................................................................

❒

Yes

❒



Is the Heater On? (Clamp an AmpProbe on one leg of the heater contactor to verify) ....

❒

Yes

❒

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. Simply adjust the ODT setpoint to

approximately four degrees below the current outdoor temperature. After the short delay, the unit will

activate 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.



Is the indoor blower motor (IBM) On? .............................................................................

❒

Yes

❒



Is the Compressor Off? .....................................................................................................

❒

Yes

❒



Is the Condenser Fan (CFM) Off? ....................................................................................

❒

Yes

❒



Is the Heater On? (Clamp an AmpProbe on one leg of the heater contactor to verify) ....

❒

Yes

❒

Heating (Check and Record Readings)

After about 10 minutes of operating in the heating mode, check and record the following data points.

Inside Temperature (IAT)

ºF

Outside Temperature (OAT)

ºF

Return Air Temperature (RAT) db (Should be same temp as IAT)

ºF

Return Air Temperature (RAT) wb (used to calculate RH% of Return Air)

ºF

Supply Air Temperature (SAT) db (Acceptable Range 15º - 20º below RAT)

ºF

Return Air Temperature (SAT) wb (used to calculate RH% of Supply Air)

ºF

Heater Contactor Amps (HCAL1)

ºF

Heater Contactor Amps (HCAL2)

ºF

Heater Contactor Amps (HCAL3)

ºF

Heater Circuit Volts (L1&L2)

ºF

Heater Circuit Volts (L1&L3)

ºF

Heater Circuit Volts (L2&L3)

ºF

Содержание Marvair MAA1020H

Страница 1: ... 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 Heat Pump Product Manual Vertical Wall Mount Heat Pumps Marvair Wall Mount Heat Pump I O Manual 06 2023 Rev 7 Manufactured By Marvair An AirX Climate Solutions Brand P O Box 400 Cordele Georgia 31...

Страница 2: ...o follow these rules may result in death serious bodily harm property damage and damage to the equipment Important Safety Precautions 1 USE CARE when LIFTING or TRANSPORTING equipment 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 OFFAT THE breaker or fuse box BEFORE installing or work...

Страница 3: ...r 4 Start Up 4 1 Check Out of Cooling Cycle 37 4 2 Check Out of Heating Cycle 38 4 3 Discharge Air Adjustment for Modulating Hot Gas Reheat HGR Valve 38 4 4 Ventilation System Set Up 39 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 installatio...

Страница 4: ...r 22 Figure 4 Fresh Air Hood Damper 32 Figure 5 Heat Pump Wall Mounting Detail 33 Figure 6a Humidity Control Wiring Detail 35 Figure 6b Thermostat Connection Diagram 36 Figure 7 Temperature Sensor Wires Modulating HGR Valve 39 Figure 8 Desired Temperature Set Point Modulating HGR Valve 39 Figure 9 Typical Configuration for Single Element Heater 43 Figure 10a Typical 1ø Electrical Schematic Diagram...

Страница 5: ...o 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 Where cooling is required during cool or cold weather e g telecommunication shelters a factory installed economizer can be used To insure proper operation and optimum performance all outside air ventilation packa...

Страница 6: ...ll 11 2 to 3 ton units 20 Filter Option A 2 Pleated MERV 8 AC HP C D MERV 11 High Filtration Package E MERV 13 High Filtration Package None Special 21 Corrosion Protection A Condenser Coil Only C Evaporator Coil Only D Both Coils Condenser Evaporator F Coat All G Coastal Package Evaporator Coil K Coastal Package None Special 22 Engineering Revision Level A3 B3 23 24 Cabinet Color 1 Marvair Beige 2...

Страница 7: ...F 131ºF 29ºC 55ºC An Optional FCC switch is required for the cooling Mode Heating mode ratings are 47 F Outdoor Temperature Performance loss realized below this rating point Table 5 Ambient Temperature Operating Ranges 1 5 General Operation Refrigerant Cycle Marvair heat pumps use R 410A refrigerant in a conventional vapor compression refrigeration cycle to transferheat Inthecoolingmode adoubleblo...

Страница 8: ... board the economizer damper is forced closed and the HVAC will operate in mechanical cooling mode This is considered as economizer override in the event economizer cooling is not sufficient for the heat load Thermostat must provide the fan G signal to HVAC to activate the indoor blower Economizer Status The economizer board has contacts that when used with the Marvair CommStat 4 Telecom HVAC Cont...

Страница 9: ...onfiguration N Barometric Fresh Air Damper Standard Barometric damper capable of up to 15 of rated airflow of outside air field adjustable no pressure relief Hot Gas Reheat HGR Dehumidification Mode Special Option G When the HGR is in the dehumidification mode the hot gas reheat HGR coil is energized The cooled dehumidified air exits the evaporator coil and is blown through the HGR coil This coil ...

Страница 10: ...ower 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 The e...

Страница 11: ...ion 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 configurable menu options for various operations and control The Marvair PCB comes equipped with seven segment display to annunciate faults which drastically reduces ...

Страница 12: ... 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 firmly secure the board to the control box After this is achieved follow the wiring diagram and menu configuration for the respective system for appropriate operation Ensure that the terminals used do not m...

Страница 13: ... 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 P PWM dC 0 10V 7 OFM Set 80 65 100 Outdoor Fan Motor Max Speed setting 8 Defrost Timer 30 30 60 90 Defrost cycle timer in minutes 9 EHDD select Y Y n CAN ONLY BE Y IF SCKT IS N 10 SCKT select n Y n SCKT...

Страница 14: ...reorhigh 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 an independent setting for the max speed at which the Outdoor fan will operate The default setting for the OFM Set is 80 of maximum speed The speed may be adjusted from 65 100 in 1 increments to meet de...

Страница 15: ...l default to compressor cooling if any sensor becomes disconnected or faulty ChangingtheECONOSelecttoN no willdisableeconomizeroperationandtheeconomizer function will be ignored 13 SensorType ThissettingisusedforselectingthetypeofeconomizersensorusedEN Enthalpy or DB Dry Bulb The appropriate sensor must be connected and selected for economizer operation This setting is configured at the factory du...

Страница 16: ...ware 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 requires 24 VAC to operate When the board is sufficiently powered the PWR status light on the PCB illuminates Green When the power supply voltage is 16vac or less for 10 seconds the control board will de energ...

Страница 17: ...umps 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 Cycle 7 0 Additional Features 7 1 Modulating Head pressure Control ECM Outdoor Motors 7 2 Emergency Ventilation 7 3 Forced Cooling 7 4 Modbus Communications 7 5 Low Voltage Brownout 8 0 Smoke Fire Shutdown ...

Страница 18: ... 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 Request 3 W2 Request 4 HUM Request 5 G Request 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 oper...

Страница 19: ...he 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 Single Stage compressors operate at full capacity upon a request for Y1 2 1 2 Y1 and Y2 Cooling Full Capacity 2nd Stage If the space temperature continues to increase pass the defined differential Stage 2 C...

Страница 20: ...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 Indoor motorcontinuestorunbasedonthefanpurgetimersetpoint default90seconds selected in setting 3 of the configuration menu of the control board Note 2 Stage compressors require a request for Y2 to operate ...

Страница 21: ...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 enthalpy sensor is being used setting 13 of the control board configuration menu will be set for EN Enthalpy A disconnected or faulty enthalpy sensor is annunciated on the control board display as ES F Econom...

Страница 22: ... 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 faulty supply air sensor is annunciated on the control board display as AS F Note A faulty or disconnected supply air sensor will override the economizer operation and force the compressor to operate 3 4 Mi...

Страница 23: ...te 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 minutes If the defrost sensor is still calling for defrost at the end of this delay it will de energize the outdoor fan energize the reversing valve through the RV terminal and keep the compressor energi...

Страница 24: ...main 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 will be allowed simultaneous operation in the heat pump heating mode Note If the ODS is used the electric heat will not operate unless the outdoor temperature is below the ODS setpoint EHDD Electric Heat D...

Страница 25: ...s 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 These outputs function as described until the Dehumidification setpoint is satisfied This is considered as ON OFF fan cycle control and the PSC motor will not modulate Note A request for Y1 or Y2 vis digital input or Modbus takes prio...

Страница 26: ...ied a built in 3 minute timer locks the compressor for that respective circuit out This can be monitored and adjusted via Modbus by referencing the appropriate register However it can only be monitored at the board level by waiting for the 3 minutes to elapse 7 0 Additional Features 7 1 ModulatingHeadPressureControl ECMOutdoorMotors A10KNominalNTCThermistor is connected to the FCC1 and FCC2 inputs...

Страница 27: ...tisfied the system will be allowed to return to economizer operation if conditions are favorable 7 4 LowVoltage Brownout The control board monitors the 24VAC power supply for low voltage protection When the power supply voltage is 16 VAC or less for 10 seconds the control board will de energize all outputs This is considered a voltage brownout low voltage condition and the display of the control b...

Страница 28: ...nd for 24 hours with primary 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 operate return the unit to the freight carrier 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...

Страница 29: ... Clearance From the Front Min Clearance Around Sides Single Unit Min Clearance Between Sides Two Units Min Space Above Unit MAA1020H 1024H MAA2024H 42 inches 30 inches 18 inches 24 inches MAA1030H 1036H MAA2030H 2036H 42 inches 30 inches 18 inches 24 inches MAA1042H 1048H MAA2042H 2048H 42 inches 30 inches 30 inches 24 inches MAA1060H MAA2060H 42 inches 30 inches 30 inches 24 inches MGA1072H 42 in...

Страница 30: ...is chosen on the Heat Pump The humidity controller controls the heat pump system when cooling or heating requirements are satisfied and the need exists to dehumidify the conditioned space When cooling or heating is required the thermostat controls the heat pump system operation 50092 Thermostat Guard For use with the 50107 and the 50252 Grilles Description Size Marvair P N For the MAA1020H 1024H M...

Страница 31: ...f all governmental authorities have jurisdiction The information contained in 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 General Information Note The following instructions are for general guidance only Due to th...

Страница 32: ...leakage Do not use duct liner on inside of supply duct within four feet 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 UL 181 to a minimum of 197o F 3 5 Fresh Air Hood The fresh air hood is located on the inside behind the slot...

Страница 33: ...y some other means the bracket alone is not sufficient 4 Make sure that the duct flanges are properly aligned with the wall opening Adjust as necessary 5 Note the holes in each side bracket Using the holes for guides drill holes through the wall with a 3 8 inch drill bit Insert the 3 8 bolts or lag screws through the brackets Tighten the bolts to secure the unit 6 Apply a bead of silicone where th...

Страница 34: ...mped on the unit rating plate To operate nominal 230 208V unit at 208V change the transformer line tap from 240V to 208V following the instruction on wiring label in unit 2 Connect the wires to the input side of the internal breaker L1 L2 for single phase units L1 L2 L3 for three phase models CAUTION CAUTION Thissystemcontainscomponentsthatrequirephasingforcorrectrotation Failure to observe rotati...

Страница 35: ... have a step down transformer for 230v motors Low Voltage Wiring 1 Pull the low voltage wiring from the Heat Pump to the thermostat sub base assembly Use 18 gauge with at least 7 conductors Class 2 thermostat wire 2 Mount the sub base on a level plane Connect the thermostat wire to the unit terminal board and the thermostat as shown in Figure 7 3 If applicable attach the thermostat assembly to the...

Страница 36: ...36 Marvair Wall Mount Heat Pump I O Manual 06 2023 Rev 7 Figure 6b Thermostat Connection Diagram ...

Страница 37: ...option on some Marvair units and may not be on your heat pump 5 Removethecoverplatefromthethermostat Slowlylowerthethermostatcoolingsetpointtemperature Once the indoor fan turns on allow approximately three minutes for the compressor and outdoor fan to start For units equipped with the low ambient control note that the outdoor fan may not come on immediately because it is cycled by refrigerant pre...

Страница 38: ...om 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 3 Move the system switch to the Off position All functions should stop The Blower Timed Delay Relay BTR keeps the blower running for 90 seconds after the unit shuts off Note The damper blade should remain closed during the heati...

Страница 39: ...ired milliamp voltage temperature Airxcel Commercial Group recommends 70ºF and no lower than 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 8 Desired Temperature Set Point 4 4 Ventilation System Set Up Manual Fresh Air System Configuration N This is the standar...

Страница 40: ... 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 departme...

Страница 41: ...eration 4 Check air filter s Check blower operation Remove airflow restriction C Unit cycles on high pressure or loss of charge 1 Loss or restriction of airflow 2 Restriction in refrigerant circuit 3 Refrigerant overcharge following field service 4 Defective high pressure control or loss of charge switch 1 Check blower assembly for proper opera tion Look for airflow restrictions e g the air filter...

Страница 42: ...nt failures before condemning the compressor The following electrical tests will aid diagnosis on single phase units 1 Start Up Voltage Measure the voltage at the compressor contactor during start up The voltage must exceed the minimum shown in Table 8 section 2 2 or compressor failure is likely A low voltage condition must be corrected 2 Running Amperage Connect a clip on type ammeter to the comm...

Страница 43: ...to the heater assembly the switch will have to be replaced by qualified service personnel after the source of the overheat problem is resolved In addition to the thermal cut out switch described above there is a single function thermal cut out switch P N 70005 mounted on the heater frame This switch controls the 24V AC control current to the heater contactor s which powers all the heating elements...

Страница 44: ... is available The heater drives liquid refrigerant from the crankcase and prevents loss of lubrication caused be oil dilution Power must be applied to the unit for 24 hours before starting the compressor Note Heat pumps with scroll compressors generally do not require crankcase heaters The indoor evaporator fan motor is cycled by the blower timed delay relay See Figure 9 Due to the large number of...

Страница 45: ...45 Marvair Wall Mount Heat Pump I O Manual 06 2023 Rev 7 Figure 10a Typical 1ø Electrical Schematic Diagram Heat Pump Models MAA with Manual Outside Air Damper ...

Страница 46: ...46 Marvair Wall Mount Heat Pump I O Manual 06 2023 Rev 7 Figure 10b Typical 208 230v 3ø Electrical Schematic Diagram Heat Pump Models MAA ...

Страница 47: ...47 Marvair Wall Mount Heat Pump I O Manual 06 2023 Rev 7 Figure 10c Typical 460v 3ø Electrical Schematic Diagram Heat Pumps Models MAA with the PC Control Board ...

Страница 48: ...e electrical components Be sure the unit has dried before restarting Use a fin comb of the correct spacing to straighten mashed or bent fins Outdoor Coil Periodically inspect the outdoor coil and the cabinet air reliefs for dirt or obstructions Remove foreign objects such as leaves paper etc If the coil is dirty it may be washed off with a commercial solvent intended for this purpose TURN OFF POWE...

Страница 49: ...rial 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 installing the replacem...

Страница 50: ...pply 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 applications without duct work Applic...

Страница 51: ...er 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 10 Install ...

Страница 52: ...52 Marvair Wall Mount Heat Pump I O Manual 06 2023 Rev 7 ...

Страница 53: ...__________________________________________________ Compressor Serial No _________________________________________________________ D Pre Start Up Is there shipping damage Yes No If so describe ________________________________________________________________ _____________________________________________________________________________ Will this damage prevent starting the unit Yes No Incoming Power ...

Страница 54: ...oltage that is Not between the Minimum and Maximum listed on the unit Data Label Must be addressed and corrected before placing the unit into full time operation Improper voltage can cause the compressor to overheat and cause premature failure Measured Line to Line Balance Is incoming voltage properly balanced use formula below to calculate balance Yes No Average Voltage L1 L2 L1 L3 L2 L3 3 ______...

Страница 55: ...power wires either at the distribution panel or at the incoming power terminal block Never rewire power wiring internal to the control box RECHECK Incoming Power and Voltage Balance in Cooling Mode Measured Line to Line Volts L1 L2 _______V L1 L3 ________V L2 L3 ______V Is incoming voltage between Min and Max voltage listed on unit Data Label Yes No An incoming voltage that is Not between the Mini...

Страница 56: ...g Did the Compressor stop Yes No Did the Condenser Fan CFM stop Yes No Did the indoor blower motor IBM Stop Yes No G Electric Reheat Mode NOTE If the HVAC system you are testing is not configured with Dehumidification Option Skip this section of the Start up Commissioning Checklist Has the Humidistat Control been installed wired to the Dehumidification input Yes No Has the Humidistat Control been ...

Страница 57: ...tpoint to approximately five percent above the current indoor Humidity Humidistat display should indicate current RH After the short delay the unit will sequence off Did the Compressor Stop Yes No Did the Condenser Fan CFM Stop Yes No Did the indoor blower motor IBM Stop Yes No Is the Heater Off Clamp an AmpProbe on one leg of the heater contactor to verify Yes No H Cooling Mode Economizer Cooling...

Страница 58: ...cal Heating Heat Pump 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 Adjust the heating setpoint to approximately two degrees above the current indoor temperature After the initial start up delay 3 ...

Страница 59: ...red as Auxiliary Heat 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 After the short delay the unit will activate Mechanical Heat Lockout start heating with Only Electric heat Notice system did not turn off Mechanical Heat turned Off ...

Страница 60: ...age L1 L2 235 Volts Measured Amperage L1 8 57 Amps 2013 95 6006 89 1000 6 01kW 6kW Outdoor Thermostat Set Point ODT Adjust the ODT setpoint to the temperature appropriate for your application either Auxiliary Heat or Mechanical Heat Lockout If you need assistance selecting the proper temperature contact tour HVAC system designer responsible for the application After adjusting the ODT for your appl...

Страница 61: ..._______________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________...

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