York 025-52740-000 Chiller Temperature Sensor — 10kΩ NTC, 5 ft Lead

YORK · Johnson Controls · HVAC / Chiller Temp Sensor · In stock

The York 025-52740-000 (P/N 025-52740-000, also written 02552740000) is a chiller / HVAC temperature sensor used across the York and Johnson Controls centrifugal, screw, and scroll chiller families. It pairs a 10kΩ NTC thermistor with a 5 ft (1.5 m) lead and is typically strapped or immersed in chilled water supply / return, condenser water, refrigerant lines, ambient air, motor windings, or bearing housings. KOEED stocks the 025-52740-000 as a York / Johnson Controls service spare alongside the wider Allen-Bradley, Siemens, Mitsubishi, Omron, Fanuc, Schneider, Yaskawa, Panasonic and KEYENCE industrial-automation lineup that our China sourcing team quotes every business day.

Key Technical Specifications / Overview

The 025-52740-000 is a passive resistance-temperature device — there is no on-board electronics, no loop power, and no field calibration. The chiller controller reads the resistance curve directly and converts it to a temperature value through its own lookup table or NTC conversion block. That makes the part a direct mechanical / electrical replacement whenever the OEM-supplied lead length, probe diameter, and 10kΩ reference resistance still match the controller's expectation.

The 5 ft lead is sized for typical York plant-room layouts, allowing the probe to reach a thermistor well on a chilled-water header, a refrigerant discharge line, or a motor bearing housing without inline splices. A potted or sealed NTC tip is standard for the 025-52740-000, giving it the moisture and refrigerant-oil resistance expected of a chiller-installed sensor. If you are migrating an aging YK or Millenium chiller to a newer Johnson Controls control board, send the existing sensor's lead-end connector photo to Moritta@KOEED.COM and we will confirm pin-for-pin compatibility before you place the order.

Application Scenarios / Where It Fits

The 025-52740-000 is documented across the York / Johnson Controls chiller range — centrifugal (YK, YV, YK Maxe, AquaEdge, Turbocor), screw (Millenium, YT), scroll (YD, YE, YP), and YORKair air-cooled series — typically as the chiller's chilled-water supply or return temperature probe. The same body style and lead gauge is also used for condenser-water sensing, refrigerant liquid-line temperature, ambient / outdoor-air sensing for head-pressure control, and motor-bearing or motor-winding temperature on larger open-drive compressors.

• York centrifugal chillers (YK / YV / AquaEdge / Turbocor) — chilled-water return sensor
• York screw chillers (Millenium / YT) — condenser water and refrigerant discharge sensing
• York scroll and YORKair air-cooled chillers — ambient / outdoor-air probe
• HVAC retrofit on building automation front-ends such as Siemens Desigo, Schneider EcoStruxure, or KEYENCE PLC interface panels
• Plant maintenance & shutdown spares stocking for 10–30-year-old Johnson Controls chillers
• Refrigeration skid OEM builds that target a generic 10kΩ NTC input
• Industrial process cooling loops wired into Mitsubishi MELSEC or Omron SYSMAC controllers
• Cross-reference installations on Yaskawa Σ-series inverter-driven compressor retrofits

Because the part is electrically a plain 10kΩ NTC, it can be repurposed on non-York chillers and HVAC plants as long as the controller's NTC curve (B-coefficient or β-value, plus 25 °C reference resistance) is matched. If you are mapping a York sensor onto a Panasonic FP-series PLC or a Fanuc Series 0i-MD front-end, our RFQ team can recommend a curve-by-curve cross-reference through the AI Diagnostic Tool or escalate to a human engineer. Real-world delivery records for similar service spares are visible on the Real-Time Records page.

Integration & Wiring Notes

The 025-52740-000 is a two-wire passive device. Polarity is not significant on a bare NTC thermistor, so the sensor lead can land on either terminal of the chiller's temperature-sensor input. If the original probe is fitted with a keyed connector, match the connector gender and pinout exactly — York uses both 2-pin and 3-pin variants across the family, and a 3-pin connector may carry a third wire for shield drain rather than a third sensor element.

• Route the lead away from VFD output cables, line-voltage power wiring, and any contactor coils. NTC sensors are high-impedance devices, and although a 10kΩ NTC is more tolerant of electrical noise than a thermocouple, long parallel runs next to VFD cabling can still inject common-mode offset that pushes the chiller controller's reading by a few tenths of a degree.
• If the original installation used shielded cable with the shield landed at the controller end only, keep that pattern. Avoid coiling excess lead length — coil a spare 12 inches at most and tie it off neatly.
• For sites with multiple York chillers in parallel, label both ends of the new lead with the chiller asset number; once the probe is buried in lagging, you will not remember which 5 ft lead goes where.
• When interfacing the 025-52740-000 to a non-York PLC (such as an Allen-Bradley CompactLogix analog input), use the PLC's built-in NTC scaling block rather than a generic voltage-to-temperature conversion — the β-curve of a 10kΩ NTC is not linear, and linearization at the wrong β will cost ±2 °C across the operating range. The Modbus CRC Calculator and the PLC Error Code Database are useful companions when commissioning mixed-brand sites.
• Use ferrules on the controller-end termination. Stranded copper sensor wire under a bare screw terminal will creep and develop a few ohms of contact resistance over 12 months, which on a 10kΩ NTC reads as a steady −0.5 °C offset — exactly the kind of small drift that gets blamed on a "bad sensor" six months later.

Installation & Commissioning Tips

Before power-up, verify the controller's expected resistance at ambient. A 10kΩ NTC at 25 °C should read between 9.5kΩ and 10.5kΩ on a bench meter; outside that window the probe is either damaged in transit or is a 5kΩ / 20kΩ variant from a different OEM and will not be read correctly by the chiller controller. If you do not have a bench meter on site, the AI Diagnostic Tool can walk you through a controller-side resistance readout for most modern Johnson Controls boards.

• Insert the probe fully into the thermowell, then add a small amount of thermal compound if the well is oversized — air gaps read low and can nuisance-trip the chiller on low-suction or high-discharge alarms.
• Tighten the thermowell compression fitting to the OEM-recommended torque (typically finger-tight plus a quarter turn on a brass well). Over-tightening a plastic well will crack it and the leak will not show up until the next cooling-season startup.
• After the new probe is fitted, force a sensor-reading display on the chiller's operator panel or trend it through the BAS for at least 15 minutes. Compare the new reading against a known-good reference (a calibrated handheld RTD or a sibling sensor on the same loop) and watch for drift.
• A York chiller that has been alarming on a faulty chilled-water sensor will usually hold a stable reading within one or two controller scans of the new probe; persistent alarms after probe replacement usually point to the controller's input board, not the sensor. If commissioning stalls, send the chiller's alarm log to Moritta@KOEED.COM and we will route the case to a controls specialist.
• Document the swap. A one-line entry in the chiller's maintenance log — date, sensor P/N, lead length, controller reading at install — will save the next shift engineer an hour of bench-testing the same loop two years from now.

Procurement, Warranty & Lead Time

KOEED sources the York 025-52740-000 as a service replacement part for chillers that have been in the field for 10–30 years, including units where Johnson Controls has consolidated or superseded the original catalog number. Send your BOM — chiller asset tag, sensor P/N, lead length, and quantity — to Moritta@KOEED.COM with the subject line RFQ — York 025-52740-000 Temp Sensor and we will respond with stock position, lead time, and an all-in CIF or EXW quotation within one business day. The same inbox also handles multi-line BOMs that pair this sensor with Allen-Bradley analog modules, Siemens SM 1231 RTD cards, or Mitsubishi Q-series temperature input blocks — quote the lot on one email, not ten.

All spares pass a bench resistance check at 25 °C and a visual inspection of the probe tip and strain relief before shipment. For multi-unit plant rollouts, KOEED can hold a project stock of 025-52740-000 against your annual consumption and release against call-off POs. Worldwide shipping is standard via DHL / FedEx / UPS, with DDP available on request. There are no minimum-order quantities for service spares; pricing depends on quantity, destination, and Incoterm. The full shipping, return, and warranty terms are published on the Shipping Policy and Return Policy pages, and the procurement workflow itself is documented under About China Sourcing Company.

For urgent night-time assistance, the AI Diagnostic Tool can pre-check the cross-reference 24/7, but the formal quote and order confirmation always come back through Moritta@KOEED.COM. New to KOEED? The About KOEED page and the Contact Us page lay out the full RFQ and post-sales workflow, and the FAQs cover the most common engineer questions on legacy chiller spares. A typical inquiry is acknowledged within 4 business hours and a firm quote is in your inbox the same business day.