Description
Otis Elevator Transfomer GAA225LT1 Brief Introduction
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Product Name |
Otis Elevator Transfomer |
| Model Number |
GAA225LT1 GAA225LS1 |
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Quality
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Original.Brand New
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Payment
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T/T. Paypal. Western Union
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Delivery
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3-5 Working Days
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Packaging
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Packed by carton
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Otis Elevator Transformer GAA225LT1 – Silent, Safe Power for Every Otis Controller | Nanjing Zhuye Elevator Parts
Behind every Otis controller, a silent workhorse steps down 400 V mains to clean 24 V, 110 V or 230 V control levels. The GAA225LT1 low-voltage transformer is that workhorse—encapsulated, low-noise, < 35 dB(A), and rated for 225 VA continuous duty in machine-room or machine-room-less shafts. When it hums louder or windings darken, CPUs reset, brakes drop, and passengers get stuck. Nanjing Zhuye Elevator Parts keeps genuine GAA225LT1 transformers in vacuum-sealed packaging, ready for next-day despatch worldwide—helping you restore clean power without costly OEM delays.
Product snapshot
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Otis part number GAA225LT1, hardware rev. LT1, insulation class F (155 °C)
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225 VA, 50/60 Hz, 400 V primary, secondaries 24 V/9 A + 110 V/2 A + 230 V/1 A
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Encapsulated toroidal core, < 35 dB(A) at 1 m, no external fan required
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Vacuum-impregnated windings, V0 flame-retardant resin, IP00 (IP54 with supplied shroud)
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Temperature rise 80 K at full load, ambient −20 °C to +70 °C, altitude 2 000 m without derating
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Mounting: 4 × M6 studs, 180 × 110 × 85 mm, 3.2 kg, through-panel or DIN-rail adapter
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CE, UL, RoHS, REACH and Otis QES 2024 approved
Where it works
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Otis Gen2® Life, Gen2® Switch, 4200/5200 controllers, LCE, GECB, XRDS operator boxes
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24 V logic supply, 110 V brake coil, 230 V contactor coil in one compact unit
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Modernisation packages replacing obsolete open-frame or noisy laminated transformers
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Any lift needing silent, cool-running 225 VA control power
Installation method – 15-minute swap-out
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Place lift on inspection mode; switch OFF main breaker; lock & tag.
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Wait 5 min for DC bus to discharge; verify zero energy on a calibrated meter.
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Photograph existing wiring; note primary and secondary polarities.
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Release DIN-rail adapter; slide old GAA225LT1 upwards and out.
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Mount new transformer; torque M6 studs to 6 Nm.
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Connect primary 400 V L1/L2/L3, earth 6 mm², secondaries 24 V/110 V/230 V; torque 0.8 Nm.
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Megger test: 500 V DC, insulation > 100 MΩ between windings and core.
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Power up; no-load current < 60 mA, no audible hum > 35 dB(A).
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Load test: 24 V @ 9 A for 10 min, temperature rise < 80 K on IR camera.
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Log serial number and test date in maintenance book.
Replacement cycle & preventive maintenance
Otis bulletin SB-TRA-2024-02 recommends:
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Visual inspection every 6 months: check for resin cracks, loose terminals, rust stains.
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Infrared scan every 12 months: hot-spots > 90 °C indicate internal short—replace immediately.
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Megger test every 3 years: insulation < 50 MΩ means moisture ingress—replace or vacuum-dry.
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Replace entire transformer every 15 years or 130 000 operating hours (24 h × 365 × 15).
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Immediate replacement if:
– audible hum > 50 dB(A) (loose laminations),
– secondary voltage drift > ±5 %,
– winding resistance change > 10 % from baseline,
– visible resin carbonisation or odour.
Pro tip: 60 % of premature failures are traced to loose primary terminals—re-torque to 0.8 Nm every year.
Maintenance tips from Nanjing Zhuye Elevator Parts
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Always use copper conductors; aluminium creeps and causes hot joints.
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Never mount sideways without 10 mm air-gap; convection needs vertical flow.
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Keep a spare GAA225LT1 in every service van; at 3.2 kg it costs less than one night call.
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After lightning storm, check primary surge arrester; a blown MOV can drop secondary voltage.
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Order the “Transformer Kit” (unit + DIN adapter + torque tool) from Nanjing Zhuye Elevator Parts to eliminate parts hunting and ensure matched components.
Why buy from Nanjing Zhuye Elevator Parts?
We are an Otis-authorised distributor, importing GAA225LT1 directly from the Czech factory, vacuum-impregnating every core and shipping with a 24-month replacement warranty. Stock is stored in humidity-controlled bins to prevent winding corrosion. Orders placed before 15:00 China time leave the same evening via DHL Express, arriving Europe or North America in 2–4 days. Bulk pricing starts at five pieces; we can pre-wire ferrules and include a loaner unit to keep your controllers powered during the swap.
Conclusion
The GAA225LT1 transformer is the silent heartbeat behind every Otis controller. By installing the genuine unit, following the torque schedule and replacing it before windings darken, you ensure clean 24 V, silent rides and zero surprise stops. Stock genuine GAA225LT1 from Nanjing Zhuye Elevator Parts today—because when the transformer stops, the whole lift stops.
