Hypertherm HT200LHF-200 Volt HySpeed - Manual (Page 36)

INSTALLATION
HySpeed HT2000LHF
Instruction Manual
3-3
9
Torch Coolant Requirements
The power supply is shipped to the customer without any coolant in the tank. Hypertherm recommends a mixture
of 30% propylene glycol, 69.9% purified water, and 0.1% benzotriazole. This mixture resists freezing to +10° F
(-12° C) and protects copper surfaces in the coolant loop.
See the chart in the appendix section to determine if a stronger propylene glycol/purified water solution is needed
for your particular application. The standard coolant mixture is available in 1-gallon containers by ordering 028872.
100% propylene glycol is available by ordering 028873.
Refer to the Material Safety Data Sheets in the appendix section for data on safety, handling, and storage of
propylene glycol and benzotriazole.
Grounding Requirements
Proper grounding is essential for personal safety and to prevent emission of high-frequency interference.
See Appendix for system grounding requirements.
Connect the worktable to a high-quality earth ground, not more than 20 feet (6 m) from the table. A suitable ground
consists of a solid copper rod of at least 1/2" (12 mm) diameter driven to a depth of at least 8 feet (2.5 m) into the
earth, below the permanent moisture level. Ensure that all grounding connections are tight to avoid excessive
heating. The power supply enclosure is grounded through the incoming AC conductor and does not require an
additional ground. See also
Grounding
in the
Safety
section. For additional information consult national or local
electric codes.
Caution: For operating temperatures colder than +10° F (-12° C), the percentage of
propylene glycol must be increased to avoid the risk of a cracked torch head,
hoses, or other damage to the torch coolant system due to the freezing of the
torch coolant.
Caution: Always use propylene glycol in the coolant. Do not substitute automotive
antifreeze which will damage the torch cooling system.
Caution: Always use purified water in the coolant mixture in order to prevent corrosion
in the cooling system. The hardness of the purified water should be between
0.2 and 8.5 ppm. If using a conductivity meter to measure water purity, the
recommended level is between 0.5 and 18 µSiemens/cm at 77° F (25° C).
WARNING
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.