Carrier 38APS025 Manual

Also see for 38APD115: Installation instructions

Carrier 38APS025 Manual Manual pdf 149 page image

149Removing Oil — If the oil level is determined to be too high,oil can be removed from the Schrader fitting on the compres-sors for the single and trio compressor circuits. Remove oilfrom the Schrader fitting on the oil equalizer tube for the tan-dem compressor circuits.If the complete oil charge must be removed, an oil dip tubeassembly is required. The oil dip tube assembly is inserted intothe compressor oil sight glass assembly. Oil dip tube assem-blies are available through Carrier Replacement Components.See Table 69.Table 69 — Oil Dip Tube AssembliesLeaving the oil dip tube assembly in place is not recom-mended. See the section Replacing the Sight Glass below forinstallation instructions.COMPRESSOR AND OIL EQUALIZER LINE SIGHTGLASSES — Compressors in single and tandem circuit ar-rangements have oil sight glasses located on the compressors(Fig. 175 and 176).Replacing the Sight Glass — The sight glass seal is accom-plished with an O ring. Do not reuse O ring.To install or replace the compressor sight glass, torque thesight glass to 50 to 58 ft-lb (68 to 78 N-m).If the sight glass is on the oil equalizer line, torque the sightglass to 25 to 30 ft-lb (34 to 40 N-m). Be sure to use a back-upwrench to install the sight glass on the oil equalizer line.Control Module ServiceLOSS OF COMMUNICATION — Loss of communicationissues can be found on the Carrier Comfort Network® (CCN)or Local Equipment Network (LEN). See the specific sectionbelow.Carrier Comfort Network (CCN) — Loss of communicationwith CCN will result in the unit entering stand-alone mode. Inthis case check CCN wiring to the machine. The CCN com-munications with external control systems can be affected byhigh frequency electrical noise generated by the MotormasterV control. Ensure unit is well grounded to eliminate groundcurrents along communication lines.Local Equipment Network (LEN) — Loss of communica-tions with the LEN is typically an internal wiring issue or ashorted input or output to a control module. Check the wiring,LEN wiring and input and output wiring.CONTROL MODULE REPLACEMENT — The Com-fortLink replacement modules are shown in Table 70. If theMain Base Board (MBB) has been replaced, verify that all con-figuration data is correct. Follow the Configuration mode tableand verify that all items under sub-modes UNIT, OPT1 andOPT2 are correct. Any additional field-installed accessories oroptions (RSET, SLCT sub-modes) should also be verified, aswell as any specific time and maintenance schedules.Table 70 — Replacement ModulesRefer to the Start-Up Checklist for 38AP units (completedat time of original start-up) found in the job folder. This infor-mation is needed later in this procedure. If the checklist doesnot exist, fill out the current information in the Configurationmode on a new checklist. Tailor the various options and config-urations as needed for this particular installation.1. Check that all power to unit is off. Carefully disconnectall wires from the defective module by unplugging itsconnectors.2. To remove the defective module, remove its mountingscrews with a Phillips screwdriver, and remove the mod-ule from the control box. Save the screws for later use.3. Verify that the instance jumper (MBB) or address switch-es (all other modules) exactly match the settings of thedefective module.NOTE: Handle boards by mounting standoffs only toavoid electrostatic discharge.4. Package the defective module in the carton of the newmodule for return to Carrier.5. Mount the new module in the unit’s control box using aPhillips screwdriver and the screws saved in Step 2.6. Reinstall all module connectors. For accessory Naviga-tor™ device replacement, make sure the plug is installedat LVT in the LEN connector.7. Carefully check all wiring connections before restoringpower.8. Verify the Enable/Off/Remote contact switch is in theOFF position.9. Restore control power. Verify that all module red LEDsblink in unison. Verify that all green LEDs are blinkingand that the scrolling marquee or Navigator display iscommunicating correctly.10. Verify all configuration information, settings, set pointsand schedules. Return the Enable/Off/Remote contactswitch to its previous position.Condenser Fan Motors — If a condenser fan motormust be replaced, be sure to orient the motor properly in themotor mount. For 38APD025-060 and 38APS025-050, orientthe motor plug toward the control box. Be sure the motor is se-curely seated in the bearing cup at the bottom of the motor sup-port. Be sure to form a drip loop in the power wiring prior toconnecting the power plug. See Condenser Fans on page 150for proper fan placement.CARRIER PART NUMBER COPELAND COMPRESSORUSAGE30RA680018 ZP/ZPD103,120,137,154,18230RA680041 ZP23530RA680040 ZP236, 29630RA680039 ZP295MODULE REPLACEMENT PART NUMBER(WITH SOFTWARE)Main Base Board (MBB) 38AP501672Scrolling Marquee Display HK50AA031Energy Management Module(EMM) 30GT515218Navigator Display HK50AA033Compressor ExpansionBoard (CXB) 30GT515219Auxiliary Board (AUX) 32GB500442EWARNINGElectrical shock can cause personal injury. Disconnect allelectrical power before servicing.