Hypertherm HD4070 Rev.8 - Manual (Page 153)

MAINTENANCE
5-6 HD4070 Instruction Manual
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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 HD4070 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.
Power Supply Coolant Draining
If the power supply needs to be transported, follow this procedure to drain the coolant from the system. 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 HD4070 system.
2. Disconnect and drain the coolant from the hoses going between the water cooler and the ignition console.
3. Place a suitable receptacle under the coolant system's drain petcock. See figure below.
4. Turn petcock counterclockwise to drain coolant.
Coolant Drain Location