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PARALLEL PIPING (FIGURE 2–8, page 12) – A sepa-
rate water control valve is required to control the dis-
charge air temperature. If a remote (externally
mounted) water–cooled aftercooler is piped in parallel
with the heat exchanger, provide a separate water con-
trol valve for the aftercooler and pipe separate inlet wa-
ter lines to both the aftercooler and heat exchanger.
The water control valve is to be adjusted to maintain oil
out of the heat exchanger within the 140 to 150 F
(60 to 66 C) range regardless of inlet water flow or
temperature as long as a minimum flow for a given tem-
perature is met (FIGURE 2–5, page 11, and
FIGURE 2–6, page 11. See Section 5, page 27, for ad-
justment instructions and maximum allowable lubricant
temperature.
ELECTRICAL WIRING – Standard Units – The Elec-
tra–Saver
compressor is factory wired for all starter
to motor and control connections for the voltage speci-
fied 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 8, 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 100 HP (75 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.
GROUNDING – Equipment must be grounded in ac-
cordance with Table 250–95 of the National Electrical
Code.
Failure to properly ground the com-
pressor package could result in con-
troller malfunction.
MOTOR LUBRICATION – Long time satisfactory op-
eration of an electric motor depends in large measure
on proper lubrication of the bearings. The following
charts show recommended grease qualities and re-
greasing intervals for ball bearing motors. For addition-
al information refer to the motor manufacturer's
instructions. The following procedure should be used
in regreasing:
1.
Stop the unit.
2.
Disconnect, tag and lockout the unit from the pow-
er supply.
3.
Remove the relief plug and free hole of hardened
grease.
4.
Wipe lubrication fitting clean and add grease with
a hand–operated grease gun.
5.
Leave the relief plug temporarily off. Reconnect
the unit and run for about 20 minutes to expell the
excess grease.
6.
Stop the unit. Replace the relief plug.
7.
Restart the unit.
Rotating machinery can cause injury
or death. Open main disconnect, tag
and lockout power supply to the start-
er before working on the electric mo-
tor.
13–8–606
Page 13
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Troubleshooting
