Depressurizing The System; Intercooler Side; Aftercooler Side - Hitachi NEXT Series Instruction Manual

Depressurizing the System

2
Air-Cooled
After cooler side
Ⓔ
Ⓕ
Ⓑ
Ⓐ
Two-way Valve (2)
Three-way change valve
Water-Cooled
After cooler side
Ⓔ
Ⓕ
Ⓑ
Ⓐ
Two-way Valve (2)
Three-way change valve
9. MAINTENANCE [How to Service the Air Compressor]
Two-way Valve (1)
Ⓒ
Ⓓ

Intercooler side

Two-way Valve (1)
Ⓒ
Ⓓ
Intercooler side
Before cleaning the drain pipe, intercooler, aftercooler,
control line filter, or replacing the check valve, reduce
the internal pressure to 0 (zero) by opening the
condensate drain. Stop the air compressor and
disconnect the main power. Close the stop valve of the
compressed air discharge. Remove rear panel (1) [Ref
No. 967] .
(1) Intercooler side
Turn the three-way change valve from Ⓐ to Ⓑ.

(2) Aftercooler side

Turn the Two-way Valve (1) from Ⓒ to Ⓓ. And
Turn the Two-way Valve (2) from Ⓔ to Ⓕ.
Verify that the interstage pressure (INTSTG.P) and
discharge pressure (DIS PRESS) is 0 (zero) on the
LCD monitor. In addition, remove the parts slowly
because the pressure is still remained in air pipings due
to the wrong operation or piping works.
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