13–10–612 Page 41
FIGURE 5–7 – WATER CONTROL VALVE
FIGURE 5–8 – DEW POINT TEMPERATURE VS.
AMBIENT TEMPERATURE
(100% RELATIVE HUMIDITY)
gauge. At normal operating air service pressure (65 to
150 PSIG) with unit warm, a pressure drop of 2 to 25
PSI can be expected between the oil inlet and the oil
outlet.
Water pressure drop from water inlet to outlet will vary
with the inlet pressure and amount of water flowing. A
normal pressure drop may range from 5 to 40 PSI. Any
change in the pressure drop from that normally held
may indicate tube leakage or fouling and should be in-
vestigated.
In many instances, the cooling water supply for the heat
exchanger will contain impurities dissolved in solution
and/or in suspension. These substances can cause
scale formations, corrosion and fouling (plugging) of
any water–cooled heat exchanger equipment. Disre-
garding the possibility that one or more of these condi-
tions exists may result in increased maintenance and
operation expense, reduced equipment life and emer-
gency shutdown. It is strongly recommended that a
reputable, local water treatment concern be engaged
to establish the corrosion, scale–forming and fouling
tendency of the cooling water and take steps neces-
sary to remedy the situation if a problem does exist.
The need for water treatment may only involve filtration
(screening) to remove debris, sand and/or silt in the
cooling water supply. However, chemical treatment
methods may be necessary in certain instances to in-
hibit corrosion and/or remove suspended solids to alter
the water’s tendency to form scale deposits, or prevent
growth of microorganisms. The normal maintenance
program for the unit should include periodic cleaning on
the tube side (water side) of the heat exchanger to re-
move deposits which enhance fouling and corrosion.
Hex head zinc anodes are used in the return bonnet
(opposite end to the water pipe connections) of heat ex-
changers to provide internal water system corrosion
protection. These anodes should be inspected periodi-
cally and replaced when the zinc has been reduced to
about 1/2 inch in length.
WATER FLOW CONTROL VALVE FOR HEAT EX-
CHANGER (Optional Equipment) – Recommended
To Conserve Water Where Appropriate –
(FIGURE 5–7 and FIGURE 5–8) The water flow con-
trol valve is adjustable to compensate for varying water
inlet temperatures and pressures (thermal control
valve prevents settings below approximate 180
_
F.).
Use the discharge air temperature gauge on the instru-
ment panel to set flow control valve for minimum water
usage to maintain discharge temperature at a minimum
of 10
_
F. above dew point at the maximum anticipated
ambient; refer to FIGURE 5–8 for the dew point tem-
perature at your operating pressure and ambient tem-
peratures.
To decrease water flow (increase compressor dis-
charge air temperature) turn the adjusting screw from
left to right, increasing spring tension. To increase wa-
ter flow (decrease compressor discharge air tempera-
ture) turn the adjusting screw in the opposite direction.
The groove at the lower edge of the adjusting screw is
Summary of Contents for ELECTRA-SAVER EAU PD - 200 HP
Page 13: ...13 10 612 Page 3 FIGURE 1 4 STARTER BOX FIGURE 1 5 PACKAGE CONTROLLER AND STARTERS...
Page 16: ...13 10 612 Page 6 DECALS 206EAQ077 212EAQ077 218EAQ077 211EAQ077 207EAQ077...
Page 17: ...13 10 612 Page 7 DECALS 216EAQ077 217EAQ077 222EAQ077 221EAQ077 208EAQ077...
Page 40: ...13 10 612 Page 30 FIGURE 4 8 CONTROL SCHEMATIC COMPRESSOR AT FULL LOAD 214ECM797 Ref Drawing...
Page 42: ...13 10 612 Page 32 FIGURE 4 10 WIRING DIAGRAM 212EAP546 Ref Drawing...
Page 43: ...13 10 612 Page 33 FIGURE 4 11 AUTO SENTRY ES CONTROLLER DISPLAY...
Page 45: ...13 10 612 Page 35 FIGURE 5 1 FLOW DIAGRAM AIR OIL SYSTEM 215EAU797 Ref Drawing...
Page 65: ......