Description

1. What the XAA25302C8 does

• 24 Vdc ±1 %, 3 A continuous, 5 A peak, 88 % efficiency @ 230 Vac
• 2.3 Ah Li-ion backup, 3-hour runtime, hot-swappable without tools
• Dual output: main 24 Vdc and isolated 12 Vdc for handset
• Built-in EMI filter, surge 4 kV, ripple <50 mV
• IP20 steel housing, built-in heat-sink, forced-cooling fan 24 Vdc 0.1 A
• CE/UL recognised to EN 81-20/50 and CSA B44.1 for 10-year design life

2. Tools to carry

• Power supply XAA25302C8 (Nanjing Zhuye part #OT-PS-XAA25302C8-3A) with battery and DIN clips
• 3 mm & 4 mm flat screwdrivers, 10 mm open wrench
• Otis Service Tool (OST) laptop with Power plug-in licence
• Multi-meter with DC current probe
• IR thermometer and lux meter (optional for handset test)
• Lock-out / tag-out kit

3. Installation – 20 minutes with one technician
   Safety: place the car on inspection, open the main disconnect and verify 0 V on the 24 Vdc rail.

1. Mark the old wires – note L/N mains, 24 Vdc output, battery plug, fan.
2. Remove two DIN clips; slide the old unit out of the rail.
3. Check the battery – replace if swollen or voltage <20 V.
4. Mount new XAA25302C8 on DIN rail; torque screws to 1.5 N·m.
5. Connect mains: brown (L), blue (N), green/yellow (PE).
6. Connect 24 Vdc: red (+), black (-), white (isolated 12 V).
7. Insert Li-ion battery until latch clicks; green LED steady.
8. Apply mains – output 24.0 V ±0.2 V; fan starts, ripple <50 mV.
9. Record serial number, date and output voltage in CMMS.

4. Functional test – prove it to the inspector
   a) Output voltage: 24.0 V ±0.2 V at no load and full load.
   b) Battery voltage: 3.7 V ±0.1 V after 1 h charge.
   c) Change-over time: <0.5 s from mains fail to battery.
   d) Duration: >3 hours at 3 A load.
   e) Export OST power report and attach PDF to site file.
5. Preventive maintenance schedule

• Monthly – press TEST button; LED must illuminate and fan run.
• Quarterly – measure output ripple; replace if >100 mV.
• Annually – run 3-hour discharge test; voltage must remain >21 V.
• Every two years – replace the Li-ion battery – capacity drops to 70 % after 500 cycles.

6. Replacement cycle – temperature decides
   Manufacturer specification: 10 years. Nanjing Zhuye analytics refine this:

• Light duty (<150 starts/day, office): 12 years
• Standard duty (150–400 starts, residential): 10 years
• High temperature (>35 °C, rooftop): 6 years – fan and capacitor life halves every 10 °C rise.

• Output <21 V – battery or DC-DC converter failing
• Fan noise >55 dB(A) – bearing failure
• Ripple >100 mV – capacitor ESR too high
• Battery swelling – risk of electrolyte leak

7. Eco-disposal & warranty
   Return the old unit in the prepaid box; Nanjing Zhuye recovers Li-ion, copper and steel and issues a €10 recycling credit. Every XAA25302C8 ships with a 24-month replacement warranty, extendable to 60 months when you join our annual battery-replacement program.
8. Why buy from Nanjing Zhuye Elevator Parts

• 500 units in stock, Rotterdam & Nanjing, ready for same-day courier
• Factory-charged Li-ion battery with hologram – no grey-market clones
• QR code on nameplate links to 3-minute test video and ripple chart
• 24/7 technical hotline staffed by ex-Otis power specialists
• Bundle pricing: buy 10 supplies and get a free spare battery plus freight credit

9. Bottom line
   A flat or noisy intercom supply is the fastest way to a failed inspection. Keep a genuine XAA25302C8 on every truck, swap and test it in 20 minutes, and your intercom will stay loud, clear and compliant for the full 10-year design life. Order today from Nanjing Zhuye Elevator Parts – the fastest route from “silent cab” to “perfect communication.”

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