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Marvair 8AA1024A-1060A & 8AA2036A-2060A I&O Manual

03/2021 Rev.1

Item Description

Outdoor Motor Control Signal Output

Indoor Motor Control Signal Output

P 1/2- Pressure for Circuit 1 and Circuit 2 (Respectively)

FS1 – Freeze Stat for Circuit 1

FS2 – Indoor Temperature Input

Modbus Communication

3 Wire [A, B, COM] and Parallel RJ-11 Port

Fan Cycle Control Input (only Applicable for EC Outdoor Motors)

Hum – Humidity Control Input (Connect to R Node)

Y 1/2 - Cooling Request for Stage 1 and Stage 2 Cooling Operation

Modbus Network Address. Set All 4 to OFF for Local Control

Potentiometers for Indoor and Outdoor Speed

Energize or De-Energize Test Mode

Set Speed of Indoor Motor for Y1 and Y2 Operation

Set Baud Rate. 19.2k Between Top and Mid. 9.6k Between Mid and Bottom

Set Indoor Motor Control Signal Type

Set Outdoor Motor Control Signal Type

Thermostat Inputs:

W2 – Heat Request

G – Indoor Fan Request

ON – Connect Respective Terminal to R Node.

Off – Open Circuit

Pressure Switch Inputs for Respective Circuit

HP – High Pressure Switch

LP – Low Pressure Switch

Switch to Be Closed for Cooling Operation. Switch to Be Connected to “R” Node

24 VAC Power Input to PCB.

Digital Outputs (24 VAC): The PCB Makes and Breaks R.

RH – Reheat

EH – Electric Heat

CC 1/2– Compressor (Respectively)

Alarm Contacts

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 pin configuration for the respective system for appropriate operation. Ensure that

the terminals used do not make any unwanted electrical connection (via strands etc.) with any other

terminals. Please allow a 1” creepage distance between the board and all other adjacent electrical

components.

2.3 Operation

LED Status Indicators

Color Type

Status

Description

Green

Power Constant On

24 VAC power has been applied

Red

Status 1

and

Status 2

Constant On

Normal Operation

1 Blink

High pressure switch has opened twice

2 Blinks

Low pressure switch has opened twice

3 Blinks

Freeze stat (optional) - Indoor coil temperature is below 35°F (1°C)

Continuous Flash of Both LEDs Insufficient voltage to the board. Less than 20 Volts

Содержание 8AA1024A

Страница 1: ...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...

Страница 2: ...aying 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 eq...

Страница 3: ...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...

Страница 4: ...Figure 3 Enthalpy Sensor Temperature Control Points 18 Figure 4 Electrical Controls Alternate Construction 18 Figure 5 Economizer Control Board 19 Figure 6a Setting the Speed for the Y1 and Y2 Operat...

Страница 5: ...relay the compressor time delay and the timed low pressure bypass In addition the control board has LED s to indicate operating status and fault conditions to assist the service technician A complete...

Страница 6: ...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...

Страница 7: ...s MODEL LBS KG Non Economizer 8AA1024A 395 179 8AA1030A 1036A 8AA2036A 2042A 451 205 8AA1048A 1060A 8AA2048A 2060A 599 272 With Economizer 8AA1024A 415 188 8AA1030A 1036A 8AA2036A 2042A 471 214 8AA104...

Страница 8: ...thecompressorhigherstartingtorqueunderlowvoltageconditions Generally not recommended on units with scroll compressors Extreme Duty Package The Extreme Duty Package allows selected Marvair air conditio...

Страница 9: ...24 000 BTU unit the strip heat is sized at approximately 20 000 BTU Because the strip heat is sized to the approximate sensible cooling capacity only selected models are available Operation When the h...

Страница 10: ...ycle switch is not in the circuit The outdoor thermostat is used with a TXV to prevent excessive cycling or hunting of the TXV Desert Duty Controls and components which allow the units to operate in v...

Страница 11: ...OMRPESSOR CONTACTOR CAPACITOR C COMP CCH DFS CC OUTDOOR AIR MOTOR OUTDOOR FAN MOTOR OUTDOOR FAN RELAY REVERSING VALVE SOLENOID OFM PLC RVS OFR OAM FAN CYCLE CONTROL RELAY FAN CYCLE CONTROL FCCR FCC RE...

Страница 12: ...CRANKCASE HEATER COMRPESSOR CONTACTOR CAPACITOR C COMP CCH DFS CC OUTDOOR AIR MOTOR OUTDOOR FAN MOTOR OUTDOOR FAN RELAY REVERSING VALVE SOLENOID OFM PLC RVS OFR OAM FAN CYCLE CONTROL RELAY FAN CYCLE...

Страница 13: ...Marvair 8AA1024A 1060A 8AA2036A 2060A I O Manual 03 2021 Rev 1 13 Figure 1c Typical Electrical Schematic w Economizer Alternate Construction...

Страница 14: ...14 Marvair 8AA1024A 1060A 8AA2036A 2060A I O Manual 03 2021 Rev 1 Figure 1d Typical Electrical Schematic w Economizer Alternate Construction...

Страница 15: ...Marvair 8AA1024A 1060A 8AA2036A 2060A I O Manual 03 2021 Rev 1 15 Figure 1e Typical Electrical Schematic w Economizer Alternate Construction...

Страница 16: ...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 select...

Страница 17: ...inimum 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...

Страница 18: ...currentlytheonlybrandofsensorsusedintheairconditioners 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...

Страница 19: ...on 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 sett...

Страница 20: ...luable 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 an...

Страница 21: ...essure 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 Reh...

Страница 22: ...iate 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...

Страница 23: ...otentiometer 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 Corr...

Страница 24: ...r 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...

Страница 25: ...mmissioning 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 syst...

Страница 26: ...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...

Страница 27: ...ty 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 Capa...

Страница 28: ...ing 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 cycle...

Страница 29: ...sor 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...

Страница 30: ...ng 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...

Страница 31: ...r 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 hardwar...

Страница 32: ...76 cm 18 inches 46 cm 24 inches 61 cm 6 inches 15 cm 1030A 1036A 2030A 2036A 30 inches 76 cm 18 inches 46 cm 24 inches 61 cm 6 inches 15 cm 1042A 1048A 1060A 2042A 2048A 2060A 30 inches 76 cm 30 inch...

Страница 33: ...On Auto change over Keypad lockout Non volatile program memory P N 50123 Digital thermostat 2 stage heat 2 stage cool 7 day programmable Fan switch Auto On Auto change over Status LED s Backlit displa...

Страница 34: ...ities 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 procedur...

Страница 35: ...ot use duct liner on inside of supply duct within 4 feet 122cm of the unit Galvanized metal duct extensions should be used to simplify connections to duct work and grilles Use fabric boots to prevent...

Страница 36: ...e 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 wal...

Страница 37: ...ystem 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...

Страница 38: ...ower 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 L...

Страница 39: ...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 s...

Страница 40: ...Contacts NC 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 TRANS...

Страница 41: ...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 con...

Страница 42: ...ease 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...

Страница 43: ...compres sor troubleshooting section E Water on floor near unit 1 Obstruction in condensate line 2 Obstruction or leak in condensate pan 3 Unit is not level 1 Check for clog or restriction 2 Check pan...

Страница 44: ...nostic LED which indicates the lockout fault The control board will enter into and indicate lockout if either of the fault conditions LPS or HPS occur twice The contactor must be closed before the fir...

Страница 45: ...ied before restarting Condenser Periodicallyinspecttheoutdoorcondensercoilandthecabinetairreliefsfordirtorobstructions Remove foreign objects such as leaves paper etc If the condenser coil is dirty it...

Страница 46: ...y 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...

Страница 47: ...________________________ Compressor Model No ______________________________________________ Serial No ______________________________________________ B Pre Start Up Is there any shipping damage Yes No...

Страница 48: ...tion 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 Exces...

Страница 49: ...Temp ________ ________ Evap Leaving Air WB Temp ________ ________ Heater Contactor Amps L1 ________ ________ Heater Contactor Amps L2 ________ ________ Heater Contactor Amps L3 ________ ________ E Coo...

Страница 50: ...pressor Amps L3 ________ ________ Notes _________________________________________________________________________ _________________________________________________________________________ ____________...

Страница 51: ...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...

Страница 52: ...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 hea...

Страница 53: ...Marvair 8AA1024A 1060A 8AA2036A 2060A I O Manual 03 2021 Rev 1 53...

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