Hypertherm HD4070 Rev.8 - Manual (Page 44)

INSTALLATION
HD4070 Instruction Manual 3-3
7
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 +10° F (-12° C) 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.
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.
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.
WARNING
C OOLANT 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.
Caution: 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.