Trane RTHC Troubleshooting Manual
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Trane RTHC Troubleshooting Manual

Trane RTHC Troubleshooting Manual

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Table of Contents

Diagnostic
Troubleshooting
Repair
RTHC and RTHD
CHHC Compressor Service and
Troubleshooting
RLC-SVD04B-EN
May 2007

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Summary of Contents for Trane RTHC

  • Page 1 Diagnostic Troubleshooting Repair RTHC and RTHD CHHC Compressor Service and Troubleshooting RLC-SVD04B-EN May 2007...

  • Page 2: Warnings And Cautions

    CFCs such as and HCFCs and HFCs. Responsible Refrigerant Practices! Trane believes that responsible refrigerant practices are important to the environment, our customers, and the air conditioning industry. All technicians who handle refrigerants must be certified. The Federal Clean Air Act (Section...
  • Page 3 WARNING Contains Refrigerant! System contains oil and refrigerant under high pressure. Recover refrigerant to relieve pressure before opening the system. See unit nameplate for refrigerant type. Do not use non-approved refrigerants, refrigerant substitutes, or refrigerant additives. Failure to follow proper procedures or the use of non-approved refrigerants, refrigerant substitutes, or refrigerant additives could result in death or serious injury or equipment damage.

  • Page 4: Compressor Operation

    Separately housed bearing sets are provided at each end of both rotors on RTHC/RTHD units. The slide valve is located below (and moves along) the rotors.
  • Page 5 Troubleshooting Procedures compressed and released directly into the discharge plenum.There is no physical contact between the rotors and compressor housing. Oil is injected into the bottom of the compressor rotor section, coating both rotors and the compressor housing interior. Although this oil does provide rotor lubrication, its primary purpose is to seal the clearance spaces between the rotors and compressor housing.

  • Page 6: Troubleshooting Procedures

    Troubleshooting Procedures On compressor shutdown, the unload solenoid valve is energized. Springs assist in moving the slide valve to the fully-unloaded position, so the compressor always starts at minimum loaded. Trouble Shooting Procedures Listed below are some tips on how to diagnose a suspected loading problem. Possible causes of the problems are also listed in Table Table 1.
  • Page 7 Change slide valve control from auto to manual. Increase the slide valve duty cycle to load and decrease to unload. RTHC - Go into the Service Setting Menu and take manual control of the slide valve. Change slide valve control mode to load, or unload.
  • Page 8 Troubleshooting Procedures Figure 4. CHHC Compressor 3. Place the chiller in ”Auto” mode and provide all necessary interlocks and a load to start the chiller 4. Allow the compressor to start and monitor the compressor currents with a clamp- on type ammeter. Load WARNING Live Electrical Components!
  • Page 9 Repair Procedures 2. Monitor the male pressure behind the piston and the amp draw of the unit. Both should gradually increase with each pulse of the load solenoid. Note: All limits are still active. If the chiller enters into a condenser, current, or evaporator limit.

  • Page 10: Repair Procedures

    Repair Procedures Repair Procedures Piston Repair WARNING Hazardous Voltage! Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.
  • Page 11 Repair Procedures Figure 5. Removing the Schrader Core 5. Loosen all the bolts on the piston housing bolts (24 mm socket). See Figure Leave 3 bolts around the piston, loose but installed, to prevent housing from coming completely off until it has been broken loose from the bearing housing. Figure 6.
  • Page 12 Repair Procedures Figure 7. Install Guide Rods 6. It may be necessary to strike on the housing with a dead blow hammer or a pry bar to loosen the piston housing. Install M16 guide rods or all thread. See Figure 7 8.
  • Page 13 Repair Procedures Figure 9. Dimensions for Cam-handle 2. It may be necessary to strike on the housing with a dead blow hammer or a pry bar to loosen the piston housing. Figure 10. Install Metal Plate and Cam - handle 3.
  • Page 14 Repair Procedures 4. If the handle is too tight to rotate, slide a “cheater” bar over the handle to help pry apart the housings. Figure 11. Rotate the Cam Plate 5. Once the housing is separated, remove the cam handle and cam plate. Install M16 Eyebolt in the top of the housing.
  • Page 15 Repair Procedures WARNING Eyebolts! Maximum load rating for eyebolts are based on a straight vertical lift in a gradually increasing manner. Angular lifts will significantly lower maximum loads and should be avoided whenever possible. If an angular lift is required, a properly seated Shoulder Pattern eyebolt must be used.
  • Page 16 Note: Piston is under spring tension, use necessary precautions while removing the piston. WARNING Hazardous Service Procedures! The maintenance and troubleshooting procedures recommended in this section of the manual could result in exposure to electrical, mechanical or other potential safety hazards.
  • Page 17 CAUTION POE Oil! The POE oil used in the system is very hygroscopic. To insure the oil does not absorb too much water, store in a clean and dry metal container that is sealed. Regardless of where the refrigerant is stored, the oil needs to be removed from the system and stored in a sealed metal container.
  • Page 18 During disassembly of a chiller, the compressor terminals are prone to damage, and it is recommended that they be protected while being moved. The Trane part number for this block is BLK01009. If the terminals are damaged or leaking they can replaced.
  • Page 19 Assembly Instructions for O-ring and Seal Cap on CHHC Compressors This kit is only applicable to terminals that are leaking between the copper stud and the ceramic, it will not work on terminals with cracked ceramics. WARNING Hazardous Voltage! Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized.
  • Page 20 Motor Terminal Replacement/Compressor Separation Procedure WARNING Hazardous Voltage! Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.
  • Page 21 CAUTION POE Oil! The POE oil used in the system is very hygroscopic. To insure the oil does not absorb too much water, store in a clean and dry metal container that is sealed. Regardless of where the refrigerant is stored, the oil needs to be removed from the system and stored in a sealed metal container.
  • Page 22 k. Label and remove the motor terminal leads. Note: The plastic terminal cover used in the factory is available from service parts. The part number for the cover is BLK01009. WARNING Heavy Objects! Do not use cables (chains or slings) except as shown. Each of the cables (chains or slings) used to lift the unit must be capable of supporting the entire weight of the unit.
  • Page 23 D Frame - 5600 lbs (2540 Kg) E Frame - 5750 lbs (2608 Kg) a. Disconnect the oil return line at the compressor by loosening the nut and set the line assembly aside. b. Disconnect the joint for the oil injection line under the compressor by loosening the nut, and set the line aside.
  • Page 24 Once the compressor is separated, disconnect the motor leads and remove the damaged terminal. 8. Clean the gasket off of the motor housing. 9. Install new terminal(s) and torque to 100 ft-lbs. 10. Install wire leads in the same location as before and torque to 40ft-lbs. 11.
  • Page 25 Table 4. Parts for Motor Terminal Repair or Replacement Description Part Number Terminal TER00609 1 per leaking terminal Rotor-Motor Housing Gasket B-frame GKT03710 Rotor-Motor Housing Gasket C-frame GKT03464 Rotor-Motor Housing Gasket D/E-frame GKT03464 RLC-SVD04B-EN...
  • Page 26 Rotor to bearing housing o-ring replacement WARNING Hazardous Voltage! Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury. WARNING Contains Refrigerant! System contains oil and refrigerant under high pressure.
  • Page 27 Design Sequence K and later Discharge line o-ring all frames RNG01414 Suction line o-ring B-frame RNG01417 Suction line o-ring C/D/E-frame RNG01512 Questions Contact the Product Technical Service department in Pueblo, Colorado with questions regarding this Service Bulletin. They can be reached at techservicepueblo@trane.com. RLC-SVD04B-EN...
  • Page 28 RLC-SVD04A-EN A business of American Standard Companies www.trane.com Trane has a policy of continuous product and product data improvement and reserves the right to For more information, contact your local Trane change design and specifications without notice. office or e-mail us at comfort@trane.com...

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