Low pump pressure

Blocked suction line

High pump pressure

Low velocity of water

Excess refrigerant

Shortage of refrigerant

Oil bubbles in sight glass

Nitrogen trapped in system

No cooling

Water warms in chillier

Water freezes in chillier

Excess of heat transfer

Thermostat control

Low pressure cut out

Oil pressure cut out

High pressure cut out

Silent operation

Excess of wear and tear

Less noise and vibration

Less power consumption