YORK YCAG-003 Chiller Control Board

YORK YCAG-003 Down? Every Minute of Chiller Downtime Costs You Money — We Ship Today

A failed YCAG-003 control board doesn’t just trip an alarm — it shuts down your entire chilled-water loop. In a pharmaceutical plant, that’s a batch loss. In a data centre, that’s a thermal event. In a hotel, that’s 300 angry guests and a compensation bill. We’ve seen all of it. The YORK YCAG-003 is the central nervous system of the YCAG-series air-cooled screw chiller, and when it fails, nothing else on that machine matters. We stock it. We test it. We ship it the same day you call.

URGENT REQUIREMENT? Contact: [email protected] | WhatsApp: +86 18359268345

Quick Technical Datasheet

Troubleshooting & Replacement Tips

After ten years of field work on YORK screw chillers across Southeast Asia and the Middle East, here’s what actually matters when you’re standing in front of a dead YCAG-003 at 2 AM:

Common Failure Signatures

• Blank operator panel / no display — Board has lost 24 VAC supply or the onboard 5 V regulator has failed. Check transformer secondary voltage first before condemning the board.
• Fault Code 17 / 18 (High Discharge Pressure) — Often misdiagnosed as a refrigerant issue. If the high-pressure transducer reads correctly on a multimeter but the board still trips, the ADC input on the YCAG-003 has drifted. Board replacement resolves this.
• Fault Code 31 (Compressor Motor Overload) — If the motor starter checks out and current draw is within nameplate, the overload input circuit on the board itself may have a failed optocoupler. Swap the board before chasing the motor.
• Intermittent capacity hunting / slide valve oscillation — Corrupted EEPROM on the control board causes erratic PID output to the slide valve solenoids. A new board with factory defaults will stabilise capacity control immediately.
• RS-485 / BMS communication loss — Isolated RS-485 transceiver on the board is a known wear item, especially in installations with poor cable shielding. The rest of the board may be fully functional; however, sourcing a replacement board is faster than component-level repair in a live plant.

Replacement Procedure — Key Steps

1. De-energise the chiller control panel and lock out / tag out per site LOTO procedure. Confirm 24 VAC is absent at the board connector before touching anything.
2. Photograph all wiring harness connections and terminal assignments on the existing board before disconnecting. The YCAG-003 has multiple JST and Molex connectors that are not keyed differently — a mis-plug will cause immediate fault on power-up.
3. Note the DIP switch configuration on the existing board. On most YCAG variants, SW1 sets the unit address for multi-chiller sequencing and SW2 configures the refrigerant type and capacity step count. Replicate these settings exactly on the replacement board before installation.
4. After installing the new board, navigate to the operator panel setup menu and re-enter site-specific setpoints: leaving chilled water temperature setpoint, demand limit, and any BMS interlock parameters. Factory defaults will not match your site configuration.
5. Perform a dry run with the compressor circuit breaker open. Verify all sensor inputs read correctly on the operator panel before allowing the compressor to start.
6. On first start, monitor slide valve position feedback and discharge superheat for the first 15 minutes. A correctly installed YCAG-003 will bring the chiller to stable capacity within two compressor loading cycles.

Reliability in Harsh Conditions

The YCAG-003 is designed to operate inside a chiller control panel that sees the full range of industrial abuse — not a climate-controlled server room. YORK’s PCB design for the YCAG series incorporates conformal coating on the board surface, which provides a measurable barrier against condensation ingress during seasonal humidity swings common in tropical and subtropical climates. The board’s power supply section is rated for input voltage fluctuations of ±15%, which matters in industrial facilities where generator switchover events cause momentary voltage spikes.

Vibration tolerance is addressed through through-hole component mounting on the primary control ICs and transformer, rather than surface-mount only — a deliberate choice for a product that lives bolted to a compressor skid. Field data from YCAG installations in Middle Eastern district cooling plants, where ambient temperatures at the control panel can reach 45 °C during summer peak, show the YCAG-003 operating continuously without thermal derating when panel ventilation is maintained per YORK’s installation guidelines.

Our tested surplus units undergo a 72-hour burn-in cycle at elevated temperature before being graded and stocked. Any board that shows parameter drift, intermittent I/O, or communication instability during burn-in is rejected. What reaches you has already survived the conditions that kill marginal boards.

Global Express Logistics

Our dispatch warehouse is located in Xiamen, Fujian — one of China’s primary export hubs with direct DHL and FedEx service centre access. For urgent breakdown orders, here is exactly what happens after you confirm:

• Order confirmed before 14:00 CST — Same-day dispatch. DHL Express or FedEx International Priority label generated within 2 hours of payment confirmation.
• Packaging — The YCAG-003 board ships in a double-layer ESD-safe bag, surrounded by 30 mm anti-static foam, inside a rigid corrugated outer carton rated for air freight handling. No bubble wrap shortcuts.
• Transit times (typical) — Southeast Asia: 2–3 business days. Middle East / India: 3–4 business days. Europe: 3–5 business days. Australia: 3–4 business days. Americas: 4–6 business days.
• Documentation — Commercial invoice, packing list, and certificate of conformance included in every shipment. For import-sensitive destinations, we can prepare a proforma invoice with HS code 8537.10 pre-filled to expedite customs clearance.
• Tracking — Tracking number sent via email and WhatsApp within 1 hour of dispatch. We monitor shipments actively and flag any customs holds to you immediately — not after a 3-day delay.
• Emergency freight — For situations where standard express is not fast enough, we can arrange same-day courier to Xiamen Gaoqi International Airport for next-flight-out cargo. Contact us directly to activate this option.

Contact Information

Reach our technical sales team directly — no ticket queues, no chatbots.
Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com

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