6.
1.4.2
Air-Cooled Coolers
The combination air-cooled lubricant cooler/aftercooler is comprised of two aluminum bar and plate
construction heat exchangers. A cooling fan blows cooling air across both coolers to reject heat from both
the compressor lubricant and the compressed air.
The fan is driven by an independent cooling fan motor.
1.4.3
Temperature Regulating Valve
The operating temperature of the machine is controlled by an automatic temperature regulating valve
which determines the proportion of lubricant that passes through the lubricant cooler versus bypassing
the cooler. The valve is integrated into the lubricant filter head which also includes the thermal control
element and bypass connection (see Figure 5). The function of the bypass is to maintain a minimum
temperature level to prevent excessive condensation from forming within the machine. The temperature
regulation is automatic and only adjustable by changing the thermal control element.
When the lubricant temperature is low, the lubricant enters the valve at port 1 (marked “IN”, from sump)
and flows partially to the cooler core via port 2 (marked “TC”, to cooler) and partially through an internal
bypass valve within the filter head. The oil from the cooler returns to the filter head via port 3 (marked
“FC” , from cooler) and mixes with lubricant from the internal bypass before flowing through the filter
element and to the air end via port 5 (marked “OUT”, to air end). See Figure 5.
As the compressor oil reaches operating temperature the bypass begins to close thus forcing more oil
through the lubricant cooler.
If the oil temperature is above the operating temperature the bypass will be fully closed and all the
compressor lubricant travels through the cooler directly.
In all cases the lubricant from the cooler and the bypass rejoin in the filter head before passing through
the spin-on oil filter. All oil is filtered before returning to the air end.
Figure 5. Typical Oil Filter Head and Temperature Control Valve Location.
Summary of Contents for KI Series
Page 1: ...1 Model __________________ Serial __________________ Rotary Screw Air Compressors...
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Page 9: ...8 CHAPTER 1 GENERAL INFORMATION...
Page 19: ...10 CHAPTER 2 INSTALLATION INSTRUCTIONS...
Page 26: ...17 CHAPTER 3 ELECTRICAL INFORMATION...
Page 30: ...21 CHAPTER 4 COMPRESSOR LUBRICANT...
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Page 40: ...31 CHAPTER 5 AIR INLET FILTER INFORMATION...
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Page 44: ...35 CHAPTER 6 COMPRESSOR OPERATIONS...
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Page 50: ...41 CHAPTER 7 TROUBLESHOOTING...
Page 57: ...48 CHAPTER 8 FORMS RECORDS AND ELECTRICAL SCHEMATICS...
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