RTHD and RTAC - Trane

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Electronic Expansion Valve Figure 36.: Compressor Service View RTAC Figure 37.Manual Override View - RTHD 56 RLC-SVD05A-EN
External LLID Sensor Internal LLID The liquid level sensor is mounted in a small tank or canister attached to the outside of the tube sheet. The evaporator’s liquid level is transmitted into the tank through a small vapor and liquid line. The liquid level sensor is required to provide input for control of the EXV, which allows the regulation of refrigerant flow into the evaporator, to match the compressor capacity. This provides for increased part load efficiencies compared to a fixed orifice device. There are two types of sensors that are used on RTAC and RTHD units. A float type senor with an external LLID was originally used on RTAC and RTHD units. A capacitance based with an internal LLID will soon be used on all units. The sensor consists of a body made from an enclosed tube and fitting, and a magnetic float which slides over the tube. Internal to the tube, and isolated from the refrigerant, is a narrow PC board with a resistor and magnetic reed switch array. The float's magnets close the reed switches pattern as it moves up the tube, creating a changing resistance (and ultimately a direct acting DC output voltage) similar to that of a potentiometer This new level sensor is a capacitive based switch. This switch is more reliable and has no moving parts. It is less sensitive to foam and will provide consistent operation across the operating map.This new sensor can be installed on existing chillers using an adapter. There are 2 capacitor sensors in the copper tube. The lower sensor is used to determine the capacitance of the liquid (refrigerant and oil mixture). The upper sensor is used to determine the height of the liquid in the evaporator. Liquid Level Sensor Checkout Procedure Is the sensor bound and communicating? Liquid Level Sensor Connect TechView and get into Binding View. This will shut the chiller down. Once in Binding View verify that the Liquid Level Senor is bound. Note: Please refer to Service Tool for questions concerning binding LLIDs and getting into Binding View. If there are multiple LLIDs that are not verified go to IPC troubleshooting. If the sensor is not bound, try to bind it. If the sensor will not bind, it could be a problem with the connector or the sensor itself. Take a close look at the connector to make sure that all four wires are securely in place. It may be necessary to remove the cap to check for broken or misplaced wires. RLC-SVD05A-EN 57
Page 1 and 2:
Diagnostic Troubleshooting Service
Page 3 and 4:
Contents CH530 Overview . . . . . .
Page 5 and 6: Main Processor Starter Module Power
Page 7 and 8: IPC Overview and Troubleshooting Th
Page 9 and 10: IPC Overview and Troubleshooting 2
Page 11 and 12: Troubleshooting problems with multi
Page 13 and 14: Chiller has multiple loss of commun
Page 15 and 16: Power SupplyPower Supply Table 2. O
Page 17 and 18: Is the sensor reading accurately? T
Page 19 and 20: Is the transducer reading accuratel
Page 21 and 22: Temperature ( 0 F) 150 140 130 120
Page 23 and 24: Table 4. VFD Components Variable Sp
Page 25 and 26: Variable Speed Fan Control - RTAC O
Page 27 and 28: Current Transformers Where: I0x = t
Page 29 and 30: � WARNING Live Electrical Compone
Page 31 and 32: RTHD Chillers Over/Under Voltage Ch
Page 33 and 34: Over/Under Voltage Starter Module 1
Page 35 and 36: Starter Starting Wye Delta With Con
Page 37 and 38: Starter De-energize 1K1 and Energiz
Page 39 and 40: Starter L2 1K3 When Maximum Phase C
Page 41 and 42: Starter 260 msec After 2K3 Opens Ru
Page 43 and 44: Starter Solid State - RTHD Only CH5
Page 45 and 46: � WARNING Live Electrical Compone
Page 47 and 48: Load Unload Compressor Capacity - R
Page 49 and 50: Compressor Capacity - RTAC Checkout
Page 51 and 52: Figure 33.CHHP Compressor Compresso
Page 53 and 54: . Compressor Capacity - RTAC Table
Page 55: Is the EXV functioning properly? El
Page 59 and 60: Gas Pump - RTHD Only Residual oil i
Page 61 and 62: Checkout Procedure CAUTION Compress
Page 63 and 64: Laptop requirements for CH530 TechV
Page 65 and 66: Using TechView Click on Local Conne
Page 67 and 68: TechView Service Tool Downloading N
Page 69 and 70: LED TechView Service Tool Watch for
Page 71 and 72: TechView Service Tool Figure 45.Uni
Page 73 and 74: RLC-SVD05A-EN 73
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RTHD and RTAC - Trane

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