AAON RQ SERIES, Manual

Page 1: ...RQ SERIES Variable Speed Scroll Compressor Supplement...

Page 2: ...escription 11 Theory of Drive Operation 11 Nomenclature 11 Temperature Humidity 11 Power On Off 11 Communication Setting 11 Input Voltage and Input Current 12 Power Factor Correction 12 Speed Control...

Page 3: ...tMaster VCC X Controller and Refrigeration System Control Module 21 Figure 7 Modular Silicon Expansion Valve 22 Figure 8 USHX 22 Figure 9 USHZ Wiring Harness 22 Figure 10 MSEV and USHC installation sc...

Page 4: ...4...

Page 5: ...5 RQ Series Variable Speed Compressor Components Variable Speed Compressor Inverter Electronic Expansion Valve WattMaster VCC X Controls EC Motor Automation Control Unit...

Page 6: ...6 Variable Speed Compressor Inverter WattMaster VCC X Controls Condenser Fan EC Motor Automation Control Unit Electronic Expansion Valve Controller...

Page 7: ...7 Example Wiring Diagram showing WattMaster Refrigeration System Module for Variable Speed Compressors Copeland Inverter Electronic Expansion Valve and Variable Speed Condenser Fan Control...

Page 8: ...e intervals between phases Oil Pump The variable speed scroll is equipped with an oil pump to ensure an adequate supply of oil to the bearing system throughout the operating speed range of 900 to 5000...

Page 9: ...l performance A filter drier is required on all R 410A and POE lubricant systems to prevent solid particulate contamination oil dielectric strength degradation ice formation oil hydrolysis and metal c...

Page 10: ...sor will provide no useful information to the service technician other than to show that each winding of the compressor is drawing current The more appropriate measurement is the current input to the...

Page 11: ...power rating and nominal voltage input to the drive Figure 3 provides a complete explanation of all of the alpha and numeric characters in the drive model number Temperature Humidity Drive operating...

Page 12: ...quence as Case I As mentioned above clear faults using the Fault Clearing method shown below Case III Loss of power shut down this control procedure is the same as major fault shut down Fault Clearing...

Page 13: ...ing The drive may indicate fault or protection for various reasons If fault or protection occurs users should power down the drive check the drive and check the drive running condition carefully For t...

Page 14: ...er than 170V Check the AC power supply and if the right voltage is supplied according to the drive model The drive running condition is not stable Check the compressor load and makes sure it is OK Res...

Page 15: ...g screws on the drive make sure they are tight If the problem still persists replace the drive 18 19 Power module temp foldback timeout Power module temperature exceeds normal design limits 1 Verify p...

Page 16: ...ow Check the input voltage and compressor is operating within limits 12 Note Two Different values are for EV2080M and EV2055M Models Model Numbers Capacity EV2080M K9 XXX 080 8 0kW EV2080M J9 XXX 080...

Page 17: ...17 Figure 4 U S Drive Model Wiring Diagram Figure 5 U S Wiring Diagram...

Page 18: ...ion Pin Number Description Figure 1 RS485 2 Not Used 3 Not Used 4 RS485 5 Common 6 EMI Drain Wire Table 3 Sensor Connector Pin Definition Pin Number Description Figure 1 Sensor Pin 2 3 3VDC 3 Not Used...

Page 19: ...ompressor reaches minimum start frequency 25 1 5 III Compressor remains at platform frequency 25 10 IV Compressor reaches commanded frequency Commanded 1 Table 5 Ramp Down Sequence Stage Description T...

Page 20: ...imum speed of the speed range at rate of 20 rpm s 2 Recovering Current Output Current Foldback Limit of operating speed range Will remain in the current speed 3 Output Current Recovering Current Speed...

Page 21: ...ndenser Fan to maintain the Head Pressure Setpoint Provides alarms and safeties for the compressor and condenser operation Contains a 2 x 8 LCD character display and 4 buttons that allow for status di...

Page 22: ...that applies varying fractions of fluid line pressure onto the second stage spool valve according to the command signal provided by the Universal SuperHeat Controller USHC The MSEV is installed at the...

Page 23: ...t Black 18 AWG 9 Pin 3 DATA RS485 Communication Black 24 AWG Shielded 9 Pin 4 DATA RS485 Communication Red 24 AWG Shielded 9 Pin 2 SENS Digital Signal Ground and Thermistor Signal Ground Black 24 AWG...

Page 24: ...ves and controls the MSEV is installed at the outlet of the evaporator in place of the TXV bulb or EEV controller sensing device The MSEV and USHC are connected together by a wiring harness A thermist...

Page 25: ...ugh the valve Also ensure that the MSEV is installed in an upwards orientation or at any angle less than 90 in either direction represented by the curved green arrows a The MSEV cannot be installed in...

Page 26: ...a vertical copper line as shown in Figure 13 the USHX cannot be installed at a downward angle represented by the red arrow 4 Drill a hole into the copper line that extended tubes may fit in to The loc...

Page 27: ...pin connector of the wiring harness Figure 15 Installed USHX with attached 10 pin wiring harness 10 Install the thermistor at the outlet of the evaporator and close to the access fitting using a zip...

Page 28: ...Mode and other settings 20 Power on the HVAC R system and the MSEV and USHX will automatically begin functioning 21 Observe the superheat temperature values in the GUI Status tab to ensure that the sy...

Page 29: ...Figure 18 a For the user s own safety only Class 2 power sources should be used to power the MSEV and USHX devices 3 Double check the power source output voltage AC transformer secondary or DC power s...

Page 30: ...tep in the procedure All connectors used between the USHX power source and MSEV should be UL approved b The wiring schemes of the Single USHC MSEV Setup and Single USHS Setup are the same except that...

Page 31: ...ted be terminated with wire nuts and wrapped with electrical tape so that they do not form short circuits with each other or any other wires or metal surfaces 10 Tape any dangling wires to existing st...

Page 32: ...orator at a 10 o clock or 2 o clock position Check that the temperature sensor is wrapped with insulated tape Over Voltage to MSEV Check the resistance across the valve terminals Remove both power con...

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Page 36: ...It is the intent of AAON to provide accurate and current product information However in the interest of product improvement AAON reserves the right to change pricing specifications and or design of it...