PowerVac® P Transformer Test and Repair
The Transformer steps the 230 VAC supply down to 24 VAC. This is the voltage at the relay and terminal block.
Transformer Testing
When testing components with power on, use care to prevent electrical shock.
1.Turn power off.
2.Remove electrical cover. Refer to: Electrical Cover.
3.Verify all wire connections are secure to transformer, relay, and terminal block.
4.Feel transformer to verify it is not hot. If it is hot, allow it to cool off.
Transformer has an internal non-resetting overload fuse. If transformer is hot to touch, allow to cool before testing. If it's hot, check ambient operating temp and input / output voltage. Verify ambient room temperature doesn't exceed 104° Fahrenheit (37 Celsius).
5.Turn power on.
6.Check low voltage on transformer connections.
a.Set meter to V.
b.Place meter probe on yellow wire connection from transformer to terminal block.
c.Place meter probe on blue wire connection from transformer to relay.
Verify reading is 24 volts (-2 / +4).
7.Install electrical cover.
| Meter Reading | Status | Required Action |
|---|---|---|
| Exceeds 24 Volts -2 / +4 |
|
Replace Transformer |
| Within 24 Volts -2 / +4 |
|
Transformer is Good |
Transformer Replacement
1.Disconnect power at on/off switch and main power supply box.
2.Remove electrical cover. Refer to: Electrical Cover.
3.Disconnect all transformer wiring.
4.Unscrew transformer from electrical box.
5.Screw new transformer into electrical box.
6.Connect wiring.
7.Install electrical cover. Restore power.
