13–11–602 Page 16
bar) water pressure should be mounted in the cooling
water outlet line after the compressor cooler. The injec-
tion water valve should be wired into the compressor
control circuit so that the valve opens to allow water to
flow any time the compressor is running. When com-
pressor stops under automatic control, or is shut off
manually, the valve should close, stopping water flow
through the system. See Wiring Diagrams,
FIGURE 4–10 and FIGURE 4–11, pages 38 and 39.
AIR/WATER RESERVOIR – The air/water reservoir–
separator combines multiple functions into one vessel.
The lower half is the reservoir, providing water storage
capacity for the system and the top portion is the prima-
ry air/water separation. The reservoir also provides lim-
ited air storage for control and gauge actuation.
CHANGING THE INJECTION WATER FILTER –
When the injection water pressure differential through
the filter reaches 30 psig (2.1 bar), an advisory will ap-
pear on the “AUTO SENTRY ES Control” panel.
Change both water filters when this occurs. To change
the water filter:
1.
Be sure the unit is completely off and that no air
pressure is in the system.
2.
Disconnect, tag and lockout the power supply to
the starter.
3.
Drain the water from the filter housing by turning
the petcock on the bottom of the filter assembly.
4.
Remove the nut at the top of the filter assembly,
while holding the filter housing to keep it from
dropping. When the nut is removed, change the
filter, and reassemble.
5.
Repeat Steps 3 and 4 on the other water filter.
6.
Reconnect the power supply to the starter, start
the machine and check for leaks.
COMPRESSOR INJECTION WATER SYSTEM
CHECK – The following readings are based on ambient
temperature of 80
_
F. (27
_
C) inlet cooling water on wa-
ter–cooled units with the system in good condition. The
compressor should be at operating temperature at the
time of the checks. One–half hour of loaded operation
is usually sufficient to reach level–out operating tem-
peratures.
Air and Water Discharge Temperature–145
_
to 170
_
F. (63
_
to 77
_
C ) – Read on the “ES Control” panel.
Compressor Injection Water Inlet Temperature –
105
_
to 120
_
F. (41
_
to 49
_
C ) – Check anywhere on
the line from the cooler to the compressor inlet.
Water Injection Cooler Temperature Differential
(Air Cooled Radiator) – The water temperature dif-
ferential depends on the temperature of the air at the
water injection cooler fan and the cleanliness of the
core faces. As ambient temperatures and core restric-
tions increase, the injection water outlet temperature
will increase. The injection water outlet temperature is
approximately the same as the air discharge tempera-
ture – see “ES Control” panel. The outlet temperature
may be checked by installing a tee in the line between
the cooler and the compressor.
Water Injection Cooler Temperature Differential
(Water Cooled Heat Exchanger) – The injection wa-
ter temperature differential depends on the inlet cooling
water temperature and the cooling water flow rate per-
mitted by the cooling water flow control valve setting.
The injection water temperature is approximately the
same as the air discharge temperature – see “ES Con-
trol” panel. The outlet temperature may be checked by
installing a tee in the line between the cooler and the
compressor.
Water Injection Cooler Pressure Differential (Air
Cooled Radiator) – 3 to 5 psig (.2 to .3 bar) – Check
injection water pressure differential in the same place
as temperature. (See above.)
Water Injection Cooler Pressure Differential (Water
Cooled Heat Exchanger) – 1 to 3 psig (.1 to .2 bar)
– Check injection water pressure differential in the
same place as temperature. (See above.)
ELECTRICAL WIRING – Standard Units – The
Twistair
R
compressor is factory wired for all starter to
motor and control connections for the voltage specified
on the order. It is necessary only to connect the unit
starter to the correct power supply. The standard unit
is supplied with an open drip–proof motor, a NEMA 12
starter and control enclosure. See “Location” para-
graph, page 9, for distance to the nearest obstruction
on starter and control box sides of the unit.
Lower operating voltages (200/208) require that the
unit starter be remote mounted since the starter is too
large to be mounted within the control enclosure. If not
supplied with the compressor unit, the starter is to be
a size 6 full voltage non–reversing type in NEMA
(CEMA) enclosure suitable for the environment, with
two (2) rejection type control circuit fuses (size accord-
ing to motor starter manufacturer’s standard), a 200
(208) volt coil, and three (3) overload heaters for 200
(208) volt 75 HP (55 KW), 1.15 service factor motor.
The overload heaters are to be selected according to
starter manufacturer’s tables based on motor name-
plate full load amperage.
Electrical shock can cause injury or
death. Open main disconnect switch,
tag and lockout before working on
starter/control box.
Summary of Contents for TWISTAIR EWDQ D
Page 14: ...13 11 602 Page 4 FIGURE 1 6 AIR WATER SCHEMATIC FIGURE 1 7 OIL SCHEMATIC...
Page 17: ...13 11 602 Page 7 DECALS 206EAQ077 212EAQ077 218EAQ077 211EAQ077 207EAQ077...
Page 18: ...13 11 602 Page 8 DECALS 216EAQ077 206EWD077 222EAQ077 221EAQ077 208EAQ077...
Page 35: ...13 11 602 Page 25 FIGURE 4 2 FLOW CHART FOR SET UP PROGRAMMING...
Page 44: ...13 11 602 Page 34 FIGURE 4 6 CONTROL TUBING SCHEMATIC 206EWD797 A Ref Drawing...
Page 48: ...13 11 602 Page 38 FIGURE 4 10 WIRING DIAGRAM FULL VOLTAGE 202EWD546 REF DRAWING...
Page 49: ...13 11 602 Page 39 FIGURE 4 11 WIRING DIAGRAM WYE DELTA 203EWD546 REF DRAWING...
Page 50: ...13 11 602 Page 40 FIGURE 4 12 AUTO SENTRY ES CONTROLLER DISPLAY...
Page 53: ...13 11 602 Page 43 FIGURE 5 2 FLOW DIAGRAM AIR COOLED 202EWD797 B Ref Drawing...
Page 54: ...13 11 602 Page 44 FIGURE 5 3 FLOW DIAGRAM WATER COOLED 203EWD797 A Ref Drawing...
Page 68: ......
