On York R-410A ZJ and ZF packaged rooftops, the high pressure switch opens at 625 ± 25 psig, per York forms 5167530-JIM-H-0218 (J06ZJ to J12ZJ) and 697890-YIM-C-0213 (ZF036 to ZF072). The store's product title lists S1-5992116 as a 625 open / 525 close psig refrigerant pressure control. The 525 psig close value comes only from that store title: York's manuals give only the opening point and do not name this part number. York's manuals list filter-drier replacement as service that exposes the POE oil, so a liquid drier like S1-6109460 should go in quickly and the system should not be left open.
What are the York ZJ and ZF refrigerant safety settings?
| Control | Setting | Lockout rule | Source |
|---|---|---|---|
| High pressure switch | Opens at 625 ± 25 psig | 3 opens within 2 hours locks out that compressor | 5167530-JIM-H-0218; 697890-YIM-C-0213 |
| Low pressure switch | Opens at 50 ± 5 psig | 3 opens within 1 hour locks out that compressor | 5167530-JIM-H-0218; 697890-YIM-C-0213 |
| Freezestat (ZF036 to ZF072) | Opens at 26 ± 5°F, resets at 38 ± 5°F | 3 opens within 2 hours; no lockout in low ambient mode | 697890-YIM-C-0213 |
| Evaporator low limit sensor (ZJ) | Trips below 26°F (default) | 3 trips within 2 hours | 5167530-JIM-H-0218 |
The 525 psig close value is from the store's product title for S1-5992116, not from these York manuals, and is not a York statement. The manuals give only the opening point.
What happens when the high pressure switch opens?
Both manuals describe the same response. The unit control board shuts off that compressor and starts the anti-short cycle delay (ASCD). On the ZF036 to ZF072 (form 697890-YIM-C-0213) the condenser fan stops too. On the J06ZJ to J12ZJ (form 5167530-JIM-H-0218) the condenser fans stop only if the other compressor is also off. If cooling is still called for when the ASCD ends, the compressor restarts. Each refrigerant system is watched on its own, so a trip on one circuit doesn't stop the other.
For the low pressure switch, form 5167530-JIM-H-0218 says the switch is ignored for the first 30 seconds of compressor run and must close within the next 30 seconds. After that, an opening longer than 5 seconds counts as a trip.
On the ZF036 to ZF072 unit control board, the flash code table (Table 29 in 697890-YIM-C-0213) lists:
| Flashes | Meaning |
|---|---|
| 2 | Control waiting ASCD |
| 3 | HPS1 – compressor lockout |
| 5 | LPS1 – compressor lockout |
| 7 | FS1 – compressor lockout |
These codes are for the ZF036 to ZF072 board in that form. Other boards, including the Smart Equipment control on the ZJ, use their own fault displays.
Our practical advice: a high pressure trip on a rooftop is usually telling you about the condenser side. Check the condenser fan, the coil and the charge before you replace the switch. A switch that opens near 625 psig is doing its job.
When do you change the filter-drier, and what do the manuals warn?
The compressors section of form 5167530-JIM-H-0218 says these units use R-410A only and a polyolester oil, Mobil 3MA POE. It warns that POE oil can absorb 15 times as much water as oils made for HCFC and CFC refrigerants. It says not to leave the system open to the atmosphere.
The same section lists procedures that risk oil leakage. They include compressor replacement and "replacing refrigerant components such as filter drier, pressure switch, metering device or coil." York warns that POE oil on the roof can cause embrittlement and cracking a year or more later, so protect the roofing.
The Predator technical guide 246824-YTG-G-1208 (ZH, ZR and XP, 6.5 to 12.5 ton) describes a solid core filter drier/strainer to remove moisture and foreign matter, and lists the high pressure switch, the loss-of-charge/low pressure switch and the evaporator freeze-protection thermostat as lockout safeties with reset at the space thermostat or the unit.
None of these manuals gives a fixed change interval for the drier. Our practical advice: replace it whenever you open the refrigerant circuit, for example for a compressor, pressure switch or metering device, and keep the system closed as much as you can while you work.
Parts involved
| Component | Role | Where to find it |
|---|---|---|
| High pressure control | Opens on high refrigerant pressure; the control board counts trips and locks out the compressor. Title lists 625 open / 525 close psig. Listed on the J10ZJ, XP090 and XP120 pages. | York S1-5992116 Refrigerant Pressure Control, 625 Open / 525 Close Flare, PSIG | OEM Source 1 Part |
| Liquid line filter-drier | Removes moisture and debris; replace when the circuit is opened. Listed on the J10ZJ, J03ZF, J04ZF and J05ZF pages. | York S1-6109460 Filter-Drier, Liquid, 3/8 ODF, DCL 053S | OEM Source 1 Part |
| Simplicity SE control board | Unit control board listed on the J10ZJ, XP090 and XP078 pages. | York S1-6421651 SSE Control Board, 2-Stage, Non-Communicating | OEM Source 1 Part |
| Temperature sensor | Listed on the J10ZJ and XP pages. Confirm which sensor position your unit uses. | York S1-02549697000 Temperature Sensor, 10 ft Lead, Female, with Clip | OEM Source 1 Part |
Which York units this applies to
- York J10ZJ parts: 10-ton ZJ rooftop covered by form 5167530-JIM-H-0218. Lists both the 5992116 switch and the 6109460 drier.
- York J03ZF parts: 3-ton ZF rooftop. Lists the 6109460 drier.
- York J05ZF parts: 5-ton ZF rooftop. Lists the 6109460 drier.
- York XP120 parts: 10-ton packaged heat pump. Lists the 5992116 switch.
- York XP090 parts: 7.5-ton packaged heat pump. Lists the 5992116 switch.
New to S1 numbers? Read what the York S1 part number prefix means.
Scope: Pressure settings and lockout rules come from York form 5167530-JIM-H-0218 (J06ZJ, J07ZJ, J08ZJ, J10ZJ, J12ZJ with Smart Equipment, R-410A, 60 Hz) and form 697890-YIM-C-0213 (ZF036 to ZF072, R-410A, 60 Hz). Drier description and lockout safeties for XP heat pumps come from technical guide 246824-YTG-G-1208. We did not read an XP installation manual, so the XP pressure settings are not stated here. The products above are shown by live title, not as a fit confirmation.
Before you order
Get the model and serial number from the nameplate and the part number from the old switch or drier. Check the connection type and size: the 5992116 is listed with a flare connection and the 6109460 with a 3/8 in. ODF connection. To confirm fit, contact us at help@totalhvacparts.com or 610-487-7999 with the model, serial and part number.
Frequently Asked Questions
What pressure does the York ZJ rooftop high pressure switch open at?
York form 5167530-JIM-H-0218 gives 625 ± 25 psig for the J06ZJ to J12ZJ. Three openings within two hours lock out that compressor.
What is the York ZF rooftop low pressure switch setting?
Form 697890-YIM-C-0213 lists the low pressure switch opening at 50 ± 5 psig on the ZF036 to ZF072. Three openings within one hour lock out the compressor.
What does 3 flashes mean on a York ZF unit control board?
Table 29 of form 697890-YIM-C-0213 lists 3 flashes as HPS1, a compressor lockout from the high pressure switch. 5 flashes is LPS1 and 7 flashes is FS1, the freezestat.
Do I need to replace the filter-drier when I change a pressure switch?
York's manuals list both filter-drier and pressure switch replacement as procedures that risk exposing the POE oil, and say not to leave the system open. Replacing the drier whenever the circuit is opened is common practice.
Sources
- York form 5167530-JIM-H-0218, J**ZJ Series with Smart Equipment, R-410A, 6-1/2 to 12-1/2 ton, 60 Hz installation manual (compressors section; cooling operation errors)
- York form 697890-YIM-C-0213, R-410A ZF Series 3 to 6 ton, 60 Hz installation manual (safety controls; cooling operation errors; Table 29 flash codes)
- York form 246824-YTG-G-1208, Predator R-410A ZH/ZR/XP Series 6-1/2 to 12-1/2 ton technical guide (guide specifications, refrigerant components)
- Live product titles for the parts listed above, as shown on each product page, and the store's J10ZJ, J03ZF, J05ZF, XP090 and XP120 series pages
R-410A systems run at high pressure and involve line voltage. Service should be performed only by qualified, certified personnel, following York's manual for your unit, EPA refrigerant rules and your facility's lockout/tagout procedures.