ELECTRICAL SAFETY
Many Tecumseh single-phase compressors are installed in systems requiring off-cycle crankcase heating. This is designed to prevent refrigerant accumulation in the compressor housing. The power is on at all times. Even if the compressor is not running, power is applied to the compressor housing where the heating element is located.
Another popular system uses a run capacitor that is always connected to the compressor motor windings, even when the compressor is not running. Other devices are energized when the compressor is not running. That means that there is electrical power applied to the unit when the compressor is not running. This calls for an awareness of the situation and the proper safety procedures.
Be safe. Before you attempt to service any refrigeration system, make sure that the main circuit breaker is open and all power is off.
FIBERGLASS FANS
Fiberglass fans require care similar to steel fans except as noted below:
1. Be sure the impeller is not striking the inlet or housing and is rotating in the proper direction.
Fiberglass may break on impact or fail quickly due to stress caused by improper rotation.
2. Do not operate a fiberglass fan in an abrasive atmosphere. Abrasives will erode resin surfaces of the FRP material and destroy the corrosion resistance of the fan.
3. Do not operate a fiberglass fan in temperatures above 150 degrees F (65 degrees C) without a specific resin and a fan design approved by the fan manufacturer.
4. Never attempt to support the fan by one flange. Use mounting brackets and appropriate vibration isolators if required. Use both flanges if the fan is mounted in ductwork.
5. Never allow the fan to operate with a vibration problem. The stress caused by vibration will quickly destroy a fiberglass fan.
LIFTING
Lifting heavy objects can cause serious problems. Strains and sprains are often caused by improper lifting methods. Figure 14.2 indicates the right and wrong way to lift heavy objects. In this case, an evaporator coil is shown.
To avoid injury, learn to lift the safe way. Bend your knees, keep your back erect, and lift gradually with your leg muscles.
The material you are lifting may slip from your hands and injure your feet. To prevent foot injuries, wear the proper steel-toed shoes.