Hypertherm HD4070 Rev.1 - Manual (Page 55)

INSTALLATION
HyPerformance HD4070 Instruction Manual 3-3
Torch coolant requirements
The power supply is shipped without any coolant in the tank. Hypertherm recommends a mixture of 30% propylene
glycol, 69.9% deionized water, and 0.1% benzotriazole. This mixture resists freezing to -12° C (+10° F) and
contains a corrosion inhibitor to protect copper surfaces in the coolant loop. This mixture is available in 1-gallon
containers by ordering 028872. 100% propylene glycol is available by ordering 028873.
WARNING
COOLANT CAN BE IRRITATING TO SKIN AND EYES AND
HARMFUL OR FATAL IF SWALLOWED
Propylene glycol and benzotriazole are irritating to skin and eyes, and harmful or fatal if
swallowed. Upon contact, flush skin or eyes with water. If swallowed, drink water and call a
physician immediately. Do not induce vomiting.
Caution: Always use propylene glycol in the coolant mixture. Do not use automotive
anti-freeze in place of propylene glycol. Antifreeze contains corrosion
inhibitors that will damage the torch coolant system.
Always use purified water in the coolant mixture in order to prevent
corrosion in the torch coolant system. See
Water purity requirements.
Caution: Use Hypertherm coolant (028872) to reduce the risk of damage
from freezing and to prevent long-term corrosion.
See Appendix B to determine if a stronger propylene glycol:purified water solution is needed for your particular
application.
Observe the warning and cautions below. Refer to the Material Safety Data Sheets in Appendix B for data on
safety, handling and storage of propylene glycol and benzotriazole.
Caution: For operating temperatures colder than the temperature stated above, the
percentage of propylene glycol must be increased. Failure to do so could
result in a cracked torch head, hoses or other damage to the torch coolant
system due to freezing.