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Marvair MAA1018A, Installation & Operation Manual

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Marvair MAA1018A Installation & Operation Manual Download Page 51

Marvair MAA/MGA Wall Mount AC Installation & Operation Manual

12/2021 Rev.16

51

After 10 minutes of compressor operation, record the following:  

 

 

Circuit 1 

Circuit 2

(if applicable)

Room Temperature

________

________

Outside Temperature

________

________

Suction Pressure

________ 

________

Suction Line Temperature

________ 

________ 

Discharge Pressure

________ 

________ 

Discharge Line Temperature

________ 

________ 

Entering Condenser Air

________ 

________ 

Leaving Condenser Air

________ 

________ 

Evap. Entering Air DB Temp

________ 

________ 

Evap. Entering Air WB Temp

________ 

________ 

Evap. Leaving Air DB Temp

________ 

________ 

Evap. Leaving Air WB Temp

________ 

________ 

Compressor Amps (L1)

________ 

________ 

Compressor Amps (L2)

________ 

________ 

Compressor Amps (L3)

________ 

________ 

Notes: 
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Summary of Contents for MAA1018A

Page 1: ...f 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...

Page 2: ...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...

Page 3: ...ns 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 Specifica...

Page 4: ...e 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 S...

Page 5: ...x 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 a...

Page 6: ...rt 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...

Page 7: ...ATING 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...

Page 8: ...outside 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 dam...

Page 9: ...ance 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 Pleas...

Page 10: ...s 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 AS...

Page 11: ...el 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 condens...

Page 12: ...12 Marvair MAA MGA Wall Mount AC Installation Operation Manual 12 2021 Rev 16 Figure 1a Typical Electrical Schematic Non Economizer Model MAA...

Page 13: ...Marvair MAA MGA Wall Mount AC Installation Operation Manual 12 2021 Rev 16 13 Figure 1b Typical Electrical Schematic Economizer Model MAA...

Page 14: ...14 Marvair MAA MGA Wall Mount AC Installation Operation Manual 12 2021 Rev 16 Figure 1c Typical Electrical Schematic Economizer Model MAA Alternate Construction...

Page 15: ...Marvair MAA MGA Wall Mount AC Installation Operation Manual 12 2021 Rev 16 15 Figure 1d Typical Electrical Schematic Economizer Model MAA Alternate Construction...

Page 16: ...16 Marvair MAA MGA Wall Mount AC Installation Operation Manual 12 2021 Rev 16 Figure 1e Typical Electrical Schematic Economizer Model MAA Alternate Construction...

Page 17: ...e 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...

Page 18: ...mper 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 Mech...

Page 19: ...orsarecurrentlytheonlybrandofsensorsusedintheairconditioners 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 Fi...

Page 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 Factor...

Page 21: ...ing 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 monitor...

Page 22: ...igh 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...

Page 23: ...ppropriate 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 us...

Page 24: ...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 Fo...

Page 25: ...its 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...

Page 26: ...endedcommissioning 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 HV...

Page 27: ...es 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...

Page 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 Partia...

Page 29: ...e 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...

Page 30: ...he 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 Co...

Page 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 1...

Page 32: ...pressor 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 h...

Page 33: ...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...

Page 34: ...an 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 MAA103...

Page 35: ...his 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 prop...

Page 36: ...t 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 T...

Page 37: ...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 t...

Page 38: ...ined 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 tempe...

Page 39: ...eads 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 Vol...

Page 40: ...ndant 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...

Page 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...

Page 42: ...omizer 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 t...

Page 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...

Page 44: ...triction 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 fact...

Page 45: ...al 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 capacit...

Page 46: ...before restarting Condenser Periodicallyinspecttheoutdoorcondensercoilandthecabinetairreliefsfordirtorobstructions Remove foreign objects such as leaves paper etc If the condenser coil is dirty it ma...

Page 47: ...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 Da...

Page 48: ...______________________________ Compressor Model No ______________________________________________ Serial No ______________________________________________ B Pre Start Up Is there any shipping damage Y...

Page 49: ...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...

Page 50: ...ir DB Temp ________ ________ Evap Leaving Air WB Temp ________ ________ Heater Contactor Amps L1 ________ ________ Heater Contactor Amps L2 ________ ________ Heater Contactor Amps L3 ________ ________...

Page 51: ...__ Compressor Amps L3 ________ ________ Notes _________________________________________________________________________ _________________________________________________________________________ ______...

Page 52: ...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 min...

Page 53: ...or 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 t...

Page 54: ...54 Marvair MAA MGA Wall Mount AC Installation Operation Manual 12 2021 Rev 16...

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