Figure 6-1 - Air Flow Chart - Gardner Denver VST110 Operating And Service Manual

·
The compressors require a stable, cool (140°F typical at 80°F ambient air) supply of injection oil in
order to operate at optimal efficiency. Under these conditions, the oil core allows 51pm oil flow with
3.6psid pressure loss.
·
The lubricating and cooling oil must be kept at a normal operating temperature below 225°F in order
to preserve its longevity.
·
·
The compressed air supply must be delivered into the distribution system at a temperature not
exceeding 15°F above the ambient level in order to protect other devices (e.g., filters, dryers, tools,
etc) against damage. At 100 psi of discharge pressure, the air core allows the flow of 1368cfm with
1.5psid pressure loss.
AIR-COOLED HEAT EXCHANGERS – Air-cooled cores (radiator-type) are provided as standard feature.
A radial fan, located on the discharge side of the heat exchanger core, draws in the required amount of
cooling air and expels it through an opening on the enclosure roof. The fan is driven by an inverter-duty,
TEFC- electric motor energized by a pulse-width-modulated variable frequency drive.
Refer to Figure 6-1 for estimates of ventilation requirements. Please note that the air-cooled package
requires the combined total of the heat exchanger plus the enclosure ventilation flow rates (which include
motor ventilation, electronics ventilation, and compressor intake). Furthermore, when package location
makes it necessary to duct fresh cooling air in/out, these ducts must be sized with a maximum (total)
pressure loss of 0.2" water gauge to avoid impacting the heat exchanger cooling air system.
All the required hardware, mechanical and electrical connections have been made at the Gardner Denver
factory, thus the only regular maintenance required is to keep the exterior core fins free from dirt and
other airborne debris per the following procedure:
Air-cooled heat exchanger cores are fabricated from aluminum. Do not use
caustic liquids to cleanse core or permanent damage will take place.
1. Be sure the unit is completely off and that oil reservoir is depressurized.
2. Disconnect, lockout and tagout power supply to the compressor package.
3. Open and/or remove enclosure door panels adjacent to cooler assembly
4. Locate cooler housing side covers (See Figure 6-2) and remove by unscrewing fasteners.
5. Inspect core area. If blocked with debris, use a moderate (e.g., 100psi) source of compressed air
and/or water while directing nozzle (pointed through core to outside) to dislodge debris and clean.
Vacuum (applied from outside) can also be employed to clean the heat exchanger cores.
6. Remove all loose debris and water from cooler box after cleaning process is complete.
7. Re-attach cooler housing side covers with provided fasteners and re-install enclosure door panels..
Minimum Cooling Air Flow Requirements
CFM
Air-Cooled
Heat
KW Exchangers
110 11000
150 14600
180 18300
Figure 6-1 – AIR FLOW CHART
13-17-605 Page 53
Enclosure
Ventilation
Fan
6300
6300
6300