York YCJD (13 SEER) and YCJF (14.5 SEER) single-stage air conditioners (R-410A, Johnson Controls): quick sheet

Covers: York (Johnson Controls Unitary Products) single-stage R-410A split condensing units: YCJD 13 SEER (sizes 18-60, technical guide 840569-YTG-C-1112) and YCJF 14.5 SEER (sizes 18-60, technical guide 700695-YTG-B-0812). Model string example YCJD36S41S1HE: capacity 18-60 (kBtu/h) + S41S1 or S41S2 configuration, then optional H = factory hard start kit, E = ElectroFin coated coil. Coleman and Luxaire sell Johnson Controls platforms under their own prefixes; read the nameplate and match the technical guide. Newer SEER2 York lines (YC2E, YC3, R-454B) are different products. Search terms: YCJD36S41S1, YCJD24S41S1H, YCJF36S41S1, York 13 SEER condenser hard start.

Single sourceBrands: York, Johnson Controls4 components

Value-tier York condensers. The YCJD uses a rotary (18), reciprocating (24-48) or scroll (60) compressor; the YCJF uses scroll compressors in all sizes. The big service point on YCJD: York says sizes 18-48 need a hard start kit when matched to a TXV indoor coil (models ending in H have it installed at the factory). Otherwise these are contactor / capacitor / fan / compressor units with 24 V control.

Safety first

Lock out power; discharge start and run capacitors.
Refrigerant work is blocked: EPA 608-certified technician.

How it works

Y from the thermostat closes the contactor; line voltage runs the compressor and the PSC fan through the run capacitor.

YCJD with a TXV (non-bleed) indoor coil: the compressor starts against pressure, so York requires a hard start kit on sizes 18-48. YCJF scroll models do not need one with a TXV per York's table.

York also lists a start assist kit (S1-2SA067*) for low-voltage areas and S1-1TVM series TXV kits.

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Official manufacturer documentation

Always confirm values against the tech sheet for the exact model.

OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work. © 2026 OnCall Tech. Original content; not a reproduction of any manufacturer document.Generic part photos (not of this brand): Smooth glass electric cooktop built into a wooden counter by Max Vakhtbovych, Pexels License

Diagnostic guides for this appliance

Guide · Air Conditioner

PTAC not cooling (fan runs, air not cold)

Most PTAC no-cool calls are airflow (filter, coils), a wrong control setting or a failed compressor start component. Rule those out before suspecting the sealed system.

6 steps ~60 minmoderate

Guide · Air Conditioner

PTAC not heating (electric heat or heat pump)

PTACs heat with electric strip heat, a heat pump, or both. Heat pump models switch to strip heat in cold weather. Check settings, then the heater element and its limits, then the reversing valve.

5 steps ~60 minmoderate

Guide · Air Conditioner

PTAC error codes: how to read and clear them

Most PTAC brands store fault codes that can be shown with a button combination on the control (for example, on GE Zoneline (2019 technical service guide) you hold FAN and the red AUX button together while the unit is OFF, and AUX clears stored faults; other models use other sequences, so use the model's tech sheet). Read the active code, fix the cause, then clear it.

4 steps ~20 mineasy

Other air conditioners manuals

Manual · Air Conditioner

Carrier Infinity Greenspeed 24VNA6 air conditioner and 25VNA4 heat pump (variable speed): quick sheet

Carrier Infinity Greenspeed Intelligence variable-speed outdoor units: 24VNA6 air conditioner (up to 26 SEER) and 25VNA4 heat pump (up to 24 SEER, up to 13 HSPF), 2-5 ton. Nomenclature from the service manual: 24 = AC, 25 = HP; V = variable speed; N = Infinity series; A = Puron (R-410A); 6 / 4 = SEER tier; two digits = nominal capacity (e.g. 36 = 36,000 BTU/h); voltage digit 3 = 208/230-1; compressor ID 4 = variable-speed scroll, 5 = variable-speed rotary. Serial format: week + year + plant letter + sequence (e.g. 0118E00001). Other 24VNA families (24VNA0, 24VNA9) use different software and code lists.

5 components4 common failuresCarrier

Manual · Air Conditioner

Trane XV20i / XV18 variable-speed outdoor units (4TTV0 AC, 4TWV0 heat pump, ComfortLink II): quick sheet

Trane variable-speed TruComfort / ComfortLink II communicating outdoor units: 4TTV0 air conditioners (XV20i family, e.g. 4TTV0024A1000C, 4TTV0036, 4TTV0048, 4TTV0060, 4TTV0061) and 4TWV0 heat pumps (Service Facts 4T-V0-SF). They use an Integrated Variable Speed Control (IVSC) board and a Communicating Display Assembly (CDA) in the outdoor unit. Distributor listings note several 4TTV0 revisions; confirm the full model on the nameplate before ordering parts. Single-stage XR14/XR16 units are on a separate sheet.

4 components3 common failuresTrane

Manual · Air Conditioner

Lennox XC21 air conditioner and XP21 heat pump (Dave Lennox Signature, iComfort-enabled): quick sheet

Lennox XC21 (air conditioner, service literature Corp. 1007-L2) and XP21 (heat pump, Corp. 1031-L7), 2, 3, 4 and 5 ton, R-410A, expansion valve indoor coils only. Both use an A175 main control (outdoor control part number 101798-xx) that works in communicating (iComfort) or conventional 24 V mode, plus a separate fan motor control. The XP21 literature describes a two-stage scroll compressor; the 2018 XC21 literature describes the compressor as one-stage while the same control section covers two-stage units, so confirm staging on the nameplate. For ML14XC1/EL16XC1 single-stage units see the separate sheet.

4 components3 common failuresLennox