Laplante V120103-RS11, Operation Manual

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Operation manual
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Figure 6-4 Oil Filter
6.4.3 Thermal Mixing Valve:
During start-up this valve provides for a bypassing of the heat exchanger so that oil flow is
quickly established to the airend. The bypass stays start
closed from 174 degree s F and
will tightly closed bypass at 201 degrees F. At unload or low capacity conditions this valve
will also maintain a minimum tank air/oil temperature to ensure that moisture in compressed
air is not condensed (temperature maintained over pressure dew point). Under very humid
operating conditions it is good maintenance practice to check receiver tank for water before
start-up and drain off if present.
6.5 Electric System and Components:
The control center houses the electrical components that support the intelligent controller.
All the electrical components are UL listed or CE listed. On the outside of control center are
mounted controller.
Standard Motors are squirrel cage induction type to NEMA construction
–
TEFC horizontal
foot mounted continuous full load operation at SF = 1.15 in 40 degrees C ambient.
Standard Starters are full voltage (UL) listed.
6.6 Modulation System:
The modulation system consists of inlet air control valve, solenoid valve and piping.
There are 3 various operation statuses.
<1> Load
When you press the
“
start
”
button the motor drives the air end through belts. The inlet air
valve is opened by light vacuum. A little air is sucked into air end and pressure in separator
is setup. When the pressure reaches
29 Psig partial air is delivered into inlet valve to close
it to stop air inlet feeding for start up under low back pressure. While the solenoid valve is
switched on to cut off the pressured air feed to inlet valve. The inlet valve re-opens to suck
air due to vacuum. When the pressure of air/oil separator reaches 51 Psig the minimum
pressure valve opens for discharge. The inlet valve fully opens and the compressor
operates under full load status. The compressor will fully loaded operate unless the
pressure exceed 145 Psig.
<2> Unload
When pressure exceeds 145 Psig, The solenoid valve is closed and compressed air is feed
into inlet valve to close it. When the compressor stops suction air the blowing off valve
opens to un-load. Then the unit converses into un-loading status.
If down steam air consumption makes pressure reduced to 130 Psig the solenoid valve
opens to cut off compressed air for inlet valve. While the inlet valve opens the compressor
re-start suction air. At the same time the blowing off valve closes, the unit converses into