7.0
INSTALLATION
23
IRN37–160K–CC & IRN50–200H–CC & IRN75–160K–2S & IRN100–200H–2S
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) and
1
1
/
2
” diameter or larger for N75/160K (N100H/200H).
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)
It is recommended that a normally closed solenoid
valve be fitted to the water outlet side of the compressor
package. This is to be wired into the compressor control
circuit. This option detail is available from
Ingersoll–Rand.
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 at
ambient temperatures, in litres per
minute (US gallons per minute)
Range
50
_
F /
10
_
C
70
_
F
/
21
_
C
90
_
F /
32
_
C
N37–45
15 (4)
23 (6.1)
38 (10)
N55
19 (5)
27 (7.1)
45 (11.9)
N75
30 (7.7)
42 (11.1)
68 (18)
N90
34 (9.0)
45 (11.9)
77 (20.3)
N110
41 (10.8)
59 (15.6)
95 (25.1)
N132
64 (16.9)
82 (21.7)
123 (32.5)
N160
73 (19.3)
95 (25.1)
150 (39.6)
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.