Welbilt Koolaire KD0270A, Technician'S Handbook, Page: 102 / 136

102 Part Number STH047 Rev01 10/18
Compressor Drawing Locked Rotor
The two likely causes of this are:
• Defective starting component
• Mechanically seized compressor
To determine which you have:
1. Install high and low side gauge set.
2. Try to start the compressor.
3. Watch the pressures closely.
• If the pressures do not move, the compressor is
seized. Replace the compressor.
• If the pressures move, the compressor is turning
slowly and is not seized. Check the capacitors and
relay.
Compressor Drawing High Amps
The continuous amperage draw on start-up should not be
near the maximum fuse size indicated on the serial tag.
The wiring must be correctly sized to minimize voltage
drop at compressor start-up. The voltage when the
compressor is trying to start must be within ±10% of the
nameplate voltage.