Overview
The AnywAiR ducted controller relies on a dual-voltage transformer/power supply to deliver both AC and DC outputs to the control box and associated components.
Transformer failure can cause the controller to lose power or display intermittent faults, particularly following a power surge or extended operation in high-heat environments.
This document outlines the test points, expected readings, and LED verification required to confirm transformer and control box integrity.
1. Power Supply Specifications
| Function | Connection | Voltage Type & Output |
|---|---|---|
| Input Power | AC Input Pins 1 & 2 | 240 V AC |
| Low Voltage Output 1 | Blue & White | 24 V AC |
| Low Voltage Output 2 | Red (+) & Black (–) | 12 V DC |
Refer to the transformer schematic and dual-voltage output diagram on page 2 of the document
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2. Multimeter Resistance Test (Transformer Windings)
Use a digital multimeter (Ω resistance setting) to check transformer coil integrity.
| Test Points | Expected Resistance |
|---|---|
| Blue → White | 1.5 Ω |
| Red → Black | 3.8 kΩ |
| AC Input Pin 1 → AC Input Pin 2 | 60 Ω |
Deviation > ±10% may indicate winding damage, internal shorting, or open circuit.
Replace the transformer if any reading is OL (open line) or 0.0 Ω (short circuit).
3. Control Box Power Plug Diode Test
With the transformer disconnected from mains power, use a multimeter in diode test mode at the control box input plug:
| Test (Lead Polarity) | Expected Reading (V) | Description |
|---|---|---|
| Black (–) → Red (+) | 1.0–1.13 V | Forward bias check |
| Red (+) → Black (–) | 0.5–0.7 V | Reverse bias check |
| Blue → White | OL | Open circuit expected |
| White → Blue | OL | Open circuit expected |
These readings verify the rectifier diodes within the control box are functional.
Abnormal readings (0.0 V or <0.4 V) indicate a shorted rectifier, which can cause power issues or breaker trips.
(Reference: Control box terminal and plug layout illustrated on page 3 of the document
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4. LED Status Indicators
Once the transformer has been verified and power restored, confirm system function by checking the LEDs on the control PCB (see page 4 visual reference).
| LED Name | Normal Operation Pattern | Meaning |
|---|---|---|
| SYS_OK | ON 2 sec / OFF 0.5 sec | System operating correctly |
| BUSY | Solid Green | Communication active |
| C9 | Dim Flash | Normal idle status |
If LEDs remain off or steady red, recheck voltage outputs and connector seating.
Absence of LED activity generally indicates transformer or internal regulator failure.
5. Diagnostic Summary
| Symptom | Probable Cause | Corrective Action |
|---|---|---|
| No power to controller | Transformer failure or open AC input | Verify 240V input, replace transformer |
| Intermittent resets | Low DC voltage (below 12V) | Check Red/Black output, replace if unstable |
| Breaker trips | Shorted internal diode or incorrect polarity | Verify diode readings, replace transformer or control box |
| No LED indication | Transformer open circuit or faulty connector | Test resistance, replace transformer harness |
6. Notes
Always isolate power before testing or removing transformer connections.
Use genuine Advantage Air / Fujitsu replacement transformer assemblies only.
Recalibrate any connected sensors or reinitialize controller functions after replacement.
Reference
Procedure derived from Fujitsu General Technical Document – UTY-ANY1 Transformer Testing Guide