7.0 INSTALLATION
7.4 WATERCOOLED UNITS
Cooling Water Piping
Water piping to and from the compressor package must be 1”diameter or larger for N37/75K (N50/100H), 11/2” diameter or larger for N75/160K (N100H/200H) and 2.0” diameter or larger for N250/300H−2S. Isolation valves with side drains should be installed on both the inlet and outlet lines. Also a strainer of 2mm−mesh size should be installed on the inlet line. Strainers are available from Ingersoll Rand. Ingersoll Rand CPN 54689997 (N37/45K & N50/60H) or CPN 54690029 (N55/75K & N75/100H)
A normally closed solenoid valve is fitted to the water outlet side of the compressor package. This is wired into the compressor control circuit and closes when the compressor stops.
Carefully inspect your water system before installing the compressor package. Ensure that the piping is free of scale and deposits that may restrict water flow to the compressor package.
Proper operation of your compressor requires that the water flow listed below be provided at a maximum supply temperature of 46° C (115° F).
Model | Minimum cooling water requirement vs | |||
Range | water inlet temperatures, in litres per | |||
| minute (US gallons per minute) | |||
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| 10°F / | 21°F / | 32°C / | 46°C / |
| 50°F | 70°F | 90°F | 115°F |
N37 | 23(6.0) | 23 (6.0) | 38 (10.0) | 57(15.0) |
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N45 | 27(7.0) | 30(8.0) | 49(13.0) | 76(20.0) |
N55 | 51(13.5) | 46(12.0) | 38(10.0) | 38(10.0) |
N75 | 95(25.0) | 68(18.0) | 46(12.0) | 53(14.0) |
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175(46.0) | 133(35.0) | 106(28.0) | 76(20.0) | |
N90 | 84(22.0) | 72(19.0) | 65(17.0) | 72(19.0) |
N110 | 95(25.0) | 80(21.0) | 72(19.0) | 87(23.0) |
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N132 | 110(29.0) | 91(24.0) | 87(23.0) | 106(28.0) |
N160 | 125(33.0) | 118(31.0) | 106(28.0) | 125(33.0) |
N250 | 91(24.0) | 110(29.0) | 179(47.0) |
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N300 | 95(25.0) | 133(35.0) | 220(58.0) |
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Water temperature and pressure gauges should be installed in the water piping for use in any fault finding of the water system. Water pressure should ideally be between 3 and 5 bar (43.5 and 72.5 psi) but must not be above 10 Bar (145 psi)
Water cleanliness is also extremely important. Cleaning of coolers as a result of fouling is a customer responsibility. Therefore, it is highly recommended that proper water quality must meet the requirements listed in WATER QUALITY RECOMMENDATIONS later in this section.
Venting the water system
At the initial installation or for start−up after draining the water system proceed to vent the system as follows.
1.Locate the water system vent cocks on top of the aftercooler and lubricant cooler.
2.Open the water valve(s) allowing water to flow to the package.
3.Open the vent cocks and allow all air to escape from the system. When water is observed at the vent cocks, close them.
The system is now vented.
Draining the water system
Should it become necessary to completely drain the water system, proceed as follows.
1.Disconnect the inlet and discharge water lines from the connections located at the rear of the unit.
2.Locate the aftercooler and lubricant cooler. Remove the drain plugs located at the bottom of the coolers. Allow the system to completely drain.
N75−160k, N100−200H Watercooled
See piping and instrumentation diagram (Section
8.3). The coolers are piped in a ”parallel” water flow arrangement with a manual trim valve controlling the flow through the aftercooler. An additional automatic anti−condensation thermal valve controls the flow of water to the oilcooler. It has a sensor in the separator tank and capillary to signal the valve to open and close in order to avoid water condensing in the tank.
Adjusting the Aftercooler Trim Valve
The anti−condensation valve has no adjustment. The Aftercooler Trim Valve is factory set and should not need adjusting but if disturbed use following procedure. Close valve fully clockwise and then open 1/4 turn. With machine running loaded observe the package discharge temperature Intellisys display. It should be be approx 15° F (8° C) above the water inlet temperature. If it is higher, open the valve a little more. Put a ’Warning − Do Not Adjust’ label on the valve or fit a lock.
IRN37 - 160K - CC & IRN50 - 200H & IRN75 - 160K - 2S & IRN - 100 - 200H - 2S & IRN 250 - 300H - 2S | 23 | |
http://air.irco.com | ||
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