Hypertherm HT2000-200 Volt - Manual (Page 173)

MAINTENANCE
8-28 HySpeed HT2000
Instruction Manual
20
Torch Coolant Draining
Hypertherm recommends draining the torch coolant from the power supply and torch before transporting the
system. After this draining procedure, a small amount of coolant will remain in the system pump and valves.
For this reason, Hypertherm also recommends that a suitable ratio of propylene glycol be purged through the
system prior to draining if the system will experience extremely cold temperatures. Note that Hypertherm's
stock propylene glycol solution 028872 is rated to 10° F (-12° C).
1. Disconnect all power to the system.
2. Remove the fill inlet cap from the reservoir to allow proper venting.
3. Drain the power supply reservoir by opening the petcock on the bottom of the reservoir tank. Close
petcock after coolant is drained. See Fig. 8-8. On older systems, there is either no petcock, or the
petcock is in a different position than the one shown in the figure below. Siphon coolant out of the tank
through the fill inlet if there is no petcock.
4. Ensure that the torch and consumables are installed and connected to the power supply.
5. Disconnect the torch coolant supply hose (black hose with the green band) from the rear of the power
supply. See Fig. 8-6.
6. Blow clean, dry, oil-free air at 80-120 psi (5.5-8.3 bar) into the torch coolant supply hose until coolant
ceases to flow into the reservoir.
7. Drain or siphon remaining coolant from the reservoir as in step 3.
8. Unscrew the coolant filter housing from the rear of the power supply. See Fig. 9-10 for location of filter
housing.
9. Empty coolant from the filter housing.
10. Screw coolant filter housing back into the rear of the power supply.
Drain petcock
Figure 8-8 Coolant Tank Reservoir Drain Petcock Location
Fill inlet
Fill inlet cap