Thermo King 098203, Maintenance Manual

Page: 180 / 264

Refrigeration Maintenance
178
Using Pressurized Nitrogen
The improper use of high pressure cylinders can cause physical damage to components, or personal
injury, or cause stress that would lead to failure of components.
Safety Precautions
Observe the proper handling of cylinders:
• Always keep protective cap on cylinder when not in use.
• Secure cylinder in proper storage area or fastened to cart.
• Do not expose to excessive heat or direct sun light.
• Do not drop, dent, or damage cylinder.
• Use a pressure regulator and a safety pressure relief valve as part of the pressure testing equipment.
The safety pressure relief valve should be of the non-adjustable, non-tempering type. The valve
should bypass any time the pressure exceeds its setting.
• Open valve slowly; use regulators and safety valves that are in good working order.
• The regulator should have two gauges; one to read tank pressure, the other to read line pressure.
Properly maintained equipment will allow leak testing, purging, or dehydration to be done safely.
Dehydration, pressure testing, purging and soldering can be accomplished with the use of dry nitrogen
(N
2
). The proper equipment and application of equipment is of greatest importance.
1. Line Pressure
2. Tank Pressure
3. Tank
4. Pressure Test Line to System
5. Safety Valve
6. Pressure Regulator
Figure 158: Typical Pressurized Gas Bottle with Pressure Regulator and Gauges
CAUTION: Nitrogen (N
2
) is under 15,170 kPa, 151.70 bar, 2200 psig, or greater. Pressure is for
full cylinder at 21 C (70 F). DO NOT use Oxygen (O
2
), acetylene or any other types of
pressurized gas on refrigeration systems or any component of a system.
AXA0194