Kriwan INT69 DMY 22A 407 S21 Motor Protection Module

Kriwan · INT69 DMY Series · Compressor Lockout Relay · In stock

The Kriwan INT69 DMY 22A 407 S21 is a German-engineered motor protection module from the Kriwan INT69 family, purpose-built for refrigeration and air-conditioning compressors. The unit monitors motor winding temperature via a PTC chain, refrigerant leakage via a second PTC chain, three-phase sequence and phase loss, and supply under-voltage / over-voltage. When any parameter drifts outside the safe envelope, the integral lockout relay drops the compressor contactor and holds it out until the fault clears and a manual or automatic reset is issued. The 22 A direct-contact rating covers most small-to-medium hermetic and semi-hermetic compressors used in supermarket racks, cold storage, HVAC plants, process chillers and transport refrigeration.

Kriwan refrigeration protection modules typically sit one tier below the Allen-Bradley and Siemens supervisory PLCs in a chiller or cold-room line, and are commonly deployed alongside Mitsubishi FX sequencing, Omron CP1E plant-room control, and Schneider Modicon M340 chiller PLCs. For the full plant scope — PLCs, HMIs, servo drives, vision systems and compressor protection — browse the complete KOEED industrial automation catalogue.

1. Key Technical Specifications

2. Application Scenarios — Where It Fits

The INT69 DMY 22A 407 S21 is the de-facto protection relay for refrigeration and HVAC compressor installations across multiple industry verticals. Typical deployments include:

• Supermarket refrigeration racks — parallel compressor banks on Bitzer, Copeland, Frascold and Maneurop semi-hermetic units
• Cold storage and walk-in freezers — multi-evaporator plants with three-phase scroll and reciprocating compressors
• Industrial process chillers and HVAC plants — paired with Schneider Modicon M340 chiller PLCs and Yaskawa Σ-7 pump and condenser-fan drives
• Transport refrigeration — refrigerated trucks, containers, last-mile delivery vans using Dorin and Embraco compressors
• Pharma and food-grade plants — clean-room HVAC skid retrofits where leak detection is mandatory for refrigerant-loss compliance
• CNC and machine-tool chiller skids — protecting the chiller compressor that cools Fanuc 0i / 30i and Allen-Bradley ControlLogix-spindle lines
• Legacy compressor retrofits — replacing Tecumseh and L’Unité Hermétique protective modules on 1990s-2000s condensing units
• Compact refrigeration controllers — supervised by Panasonic FP0R, Omron CP1E or Mitsubishi FX3U for small plant rooms; the relay’s lockout contact feeds straight into the PLC fault input
• Vision-inspected compressor assembly lines — KEYENCE CV-5000 / XG-8000 vision systems check the seal, the Siemens LOGO! runs the test sequence, and the Kriwan relay proves the compressor before the run-test station clears the unit

Browse the related refrigeration compressor spare-parts and motor protection modules categories for related Kriwan INT69 variants and matching contactor / overload kits.

3. Integration & Wiring Notes

The INT69 DMY is a hard-wired protective device, not a bus module — every connection is a terminal screw. The five wiring zones below cover almost every field installation we see at KOEED:

Practical wiring pitfalls we see in the field: (a) PTC and leak conductors routed in the same tray as VFD output cables — induced common-mode noise will cause nuisance trips; (b) using the 22 A output to switch a 60 A compressor contactor coil directly (it will, but the contact life drops sharply — pilot an external contactor for anything above 22 A); (c) running the relay off a single phase with a jumper to L2/L3 — phase-loss detection then becomes a nuisance trip on every brown-out, so use the relay on a properly balanced three-phase feed.

4. Installation & Commissioning Tips

• Mount vertically on a 35 mm DIN rail inside the control cabinet, away from contactor coils and VFD output cabling. Leave at least 25 mm above and below for airflow.
• Set the reset-mode jumper (manual vs. automatic) before applying power — the position is read at start-up and latched until the next power cycle.
• First power-up without the compressor: apply control voltage, watch the green LED sequence (ready → run → fault), and confirm 11-12 closes within 3 seconds.
• Force a trip test: terminate the PTC input with a 4 kΩ resistor and confirm the relay drops the contactor within 1 second and latches in the fault state.
• Verify phase sequence by swapping any two of L1/L2/L3 and confirming the relay refuses to close the contactor — this is the only reliable way to prove phase-sequence protection at commissioning.
• Record the firmware code (407) and sensor type (S21) on the panel drawing and on the asset register — Kriwan’s catalog is keyed off those two digits and the wrong code will not accept the same sensor chain.
• Reset procedure: cycle control voltage OFF for at least 5 seconds (manual reset) or wait out the auto-reset timer (typically 5–10 minutes, depending on variant).
• Annual PM: torque the terminal screws, blow out dust with low-pressure dry air, and exercise the lockout by simulating a PTC trip — the same procedure is recommended in the Kriwan INT69 DMY service manual.
• Spare-parts strategy: keep one relay on the shelf for every ten compressors in the plant — INT69 lockouts are the most common single-point-of-failure on a refrigeration skid, and the panel builder’s lead time is the bottleneck, not the relay itself.

If you are unsure which firmware / sensor code to order, the KOEED AI Diagnostic Tool can read a nameplate photo and propose the matching Kriwan variant in seconds.

5. Procurement, Warranty & Lead Time

Related searches on KOEED: refrigeration compressor spare parts · motor protection modules · Bitzer compressor spares · Copeland compressor spares · Frascold compressor spares · Maneurop compressor spares · Kriwan INT69 DMY 22A 407 S21 product page · Create a Quote · Contact Us

KOEED is an independent industrial-automation channel partner — not an OEM subsidiary of Kriwan, Allen-Bradley, Siemens, Mitsubishi, Omron, Fanuc, Schneider, Yaskawa, Panasonic or KEYENCE. All brand names and part numbers are the property of their respective owners and are used for identification purposes only. Send your BOM to Moritta@KOEED.COM and our KOEED team will reply with availability and quotation within 24 hours on business days. See also our gallery for product photos of recent Kriwan INT69 shipments.