Temperature Probe Diagnostics

Technical Support Subject Temperature Probe Diagnosis and Troubleshooting Document Version Department Revision Details Revised by Tech Engineering Implemented EXT-ALL-003 A Tech Document Release SP 6 May 2016 JPC 6 May 2016 N/A 6 May 2016 Page 1 of 2 Knowledge Base: www.kb.vmacair.com Email: tech@vmacair.com Web: www.vmacair.com Technical Support: 1(888)241-2289 Toll Free:1(800)738-8622 Fax: 1(877)740-3201 System or Parts affected Underhood70 / 150 / ”G” / OEM RAPTAIR60 / RAPTAIR MF / OEM PREDATAIR40 / 60  Thermistor (Temp Probe) P/N# 3550682  Thermistor (Temp Probe) P/N# 3550794  Thermistor (Temp Probe) P/N# 3550719 Flow Chart Click or scan the QR Code to link to VMAC’s Owner’s Manuals Technical Support Subject Temperature Probe Diagnosis and Troubleshooting Document Version Department Revision Details Revised by Tech Engineering Implemented EXT-ALL-003 A Tech Document Release SP 6 May 2016 JPC 6 May 2016 N/A 6 May 2016 Page 2 of 2 Knowledge Base: www.kb.vmacair.com Email: tech@vmacair.com Web: www.vmacair.com Technical Support: 1(888)241-2289 Toll Free:1(800)738-8622 Fax: 1(877)740-3201 Testing Control Box Voltage Unplug the temperature probe from the control box. Confirm that the voltage coming out of the Control Box is 5V. Temperature Probe Testing Using an Ohm (Ω) meter, measure the resistance on the following wires: For 2-wire probes (Figure 1): White to White: _____________ Measurement should be between: Compressor 270 Ω and 680 Ω / Hydraulic: 1.2 kΩ and 2.5 kΩ at the time of failure. Figure 1 For 4-wire probes (Figure 2): White to Red: ________________ White to Green: _________________ Black to Red: ________________ Black to Green: _________________ All 4 measurements should be between 270Ω and 680Ω at the time of failure. White to Black and Red to Green should be 0 ohms. Figure 2