Condensate Drain Port (Intercooler/Aftercooler) (Daily Check) Clean The Strainer Elements (Bi-Annually) & Orifices (Annually) - Hitachi NEXT Series Service Manual

4.2 Condensate drain port (Intercooler/Aftercooler) (Daily check)
Clean the strainer elements (Bi-Annually) & Orifices (Annually)
■ Check the condensate drain
Moisture in the intake air, especially in hot and humid environments, is condensed inside the air compressor during
compression. Daily inspect intercooler/aftercooler condensate drain to verify that there is a discharge of
compressed air (with condensate) when the air compressor is loaded. Bi-annually, clean the strainer element and
annually clean the orifice for both intercooler/aftercooler.
■ Operation of drain solenoid valve
Detailed open/close operations of the drain solenoid valve for the intercooler and aftercooler are as follows:
① During starting
・After operation startup (Y1 ON) and start unload, the valve opens 1 second.
② During loading
・The valve opens 2 seconds in every 45 seconds for 45/55 kW model.
・The valve opens 2 seconds in every 30 seconds for 75 kW model.
45S for 45/55 kW
30S for 75 kW
③ During unloading (For V type, during blowoff)
・ After 1 second has passed since unloading, the valve opens 1 second. If unload is continued, the valve will open
1 second in every 600 seconds.
④ During operation stop (including automatic stop)
・After 1 second has passed since operation stop, the valve opens 1 second.
(If the valve is open at the time of operation stop, the valve will be closed once.)
⑤ After operation stop
・The valve opens 1 second in every 30 minutes
30min
2S
1S
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