Hypertherm HT4400 HySpeed Plasma Arc Cutting System - Manual (Page 95)

MAINTENANCE
5-4 HT4400 Instruction Manual
7
Torch Coolant Draining
If the torch needs to be changed or transported, follow this procedure for draining the torch coolant from the torch
and torch leads. Coolant should be drained from the system every 6 months. See Preventative Maintenance
Schedule at the back of this section.
1. Disconnect all power to the HT4400 system.
2. Disconnect the torch leads from the ignition console and valve cluster.
3. Ensure that the consumables are installed in the torch.
4. Position the torch lead fittings over a drain or other suitable device to collect coolant.
5. Blow clean, dry, oil-free air at 80-120 psi (5.5-8.3 bar) into the hose with the green band. Coolant will flow
out of hose with the red band.
Cooler Draining
If the cooler needs to be transported, follow this procedure to drain the coolant from the cooler. Coolant should be
drained from the system every 6 months. See Preventative Maintenance Schedule at the back of this section.
1. Disconnect all power to the HT4400 system.
2. Disconnect and drain the coolant from the hoses going between the cooler and the ignition console.
3. Place a suitable receptacle under the cooler's drain petcock.
4. Turn petcock counterclockwise to drain cooler.
Cooler Drain Location
Petcock