Water System Venting; Draining The Water System - Sullair SN55 User Manual

4: Installation
utilizing an aftercooler. Cooler water will reduce water-
flow requirements and warmer water will increase water-
flow requirements.
Table 4-1: Water flow requirements
70°F (21°C)
Motor size gal/min
75 hp (55 KW) 10.5
100 hp (75 kW) 14.0
1
Water pressure should be maintained between 25 and 75 psig (1.7
and 5.2 bar), but not to exceed 145 psig (10 bar).
Water piping to and from the compressor unit must be a
minimum of 1 inch diameter. Isolation valves with side
drains should be installed on both input and return lines.
Input water should have a 2 mm strainer installed in-line.
A normally closed solenoid valve should be connected to
the water outlet of the compressor. The compressor con-
trol circuit switches this circuit. Consult the Sullair Service
Department for assistance in these setups.
Water quality is critical to proper cooling of the compres-
sor. Excessive build-up of lime, scale or other deposits
can restrict the flow of water to the compressor. These
deposits act as a thermal insulator and reduce the effi-
ciency of the water cooler.
The cleaning of piping and water coolers is the cus-
tomer's responsibility. Inspect all piping for deposits and
clean as necessary. Refer to Section 4.2.5: Water quality
recommendations on page 56.
Table 4-2: Ventilation requirements indicates the mini-
mum ventilation requirements necessary to keep the
compressor running at its normal operating temperature.
The fan air requirement is the amount of air, which must
flow through the compressor for proper ventilation. The
heat rejection requirement is the amount of heat that is
radiated by the compressor. This heat must be removed
Table 4-2: Ventilation requirements
Cooling type
Air-cooled with aftercooler
Water-cooled
55
Water temperature and
1
required water flow
80°F (27°C)
L/min gal/min L/min
39.7 13.0
53.0 18.8
Motor size cfm
75 hp (55 kW) 6,000
100 hp (75 kW) 8,200
75 hp (55 kW) 2,845
100 hp (75 kW) 2,845
Subject to EAR, ECCN EAR99 and related export control restrictions.
SN55, SN55S, SN55V, SN75, SN75S, SN75V User Manual
to assure a normal operating temperature. With air-
cooled compressors it is possible to use this heat for
space heating, providing additional pressure drop across
the fan does not exceed 0.2 in H
office for assistance in utilizing this heat. If ductwork is
added, the high static fan option is required.
Do not install a water-cooled or an air-cooled/after-
cooled compressor where it will be exposed to tempera-
tures less than 32°F (0°C). Consult factory for machine
operation in ambient temperature less than 32°F (0°C).
49.2
71.2
If machine is equipped with water regulating valve, use
the water regulating valve to adjust compressor tempera-
ture to maintain a minimum of195°F (91°C) [210°F (99°C)
®
for 24KT or pressures are rated above150 psig].
Temperature and pressure gauges should be installed in
the water piping for use in troubleshooting of the water
system. Water pressure should ideally be between 25
and 75 psig (1.7 and 5.2 bar) but must not be above
145 psi (10 bar).
4.2.3

Water system venting

Vent the system upon installation or after draining the
system on start-up:
1. Open the water valve(s) allowing water to flow to
the system.
2. Open the vent cocks (located on top of the after-
cooler and the lubricant cooler) and allow all air
to escape from the system. When water is
observed at the vent cocks, close them.
The system is now vented.
4.2.4

Draining the water system

If the system needs to drained completely, follow the
steps outlined below:
1. At the rear of the unit. Disconnect both the inlets
and discharge water lines.
Ventilating air—
Fan air
3
m /h BTU/h
10,194 213,000
13,932 286,000
4,834 13,300
4,834 15,800
02250247-571 R04
O. Consult a Sullair
2
Cooling water—
heat rejection
kcal/h BTU/h
53,675
72,071
3,352 213,000
3,982 286,000
heat rejection
kcal/h
— —
— —
53,675
72,071