Gardner Denver AirSmart EAU99T, Operating And Service Manual

Page: 23 / 77

13-10-618 Page 22
PARALLEL PIPING (Figure 2-8, page 21) - A separate water control valve is required to control the
discharge air temperature. If a remote (externally mounted) water-cooled aftercooler is piped in parallel
with the heat exchanger, provide a separate water control valve for the aftercooler and pipe separate inlet
water 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
°
F to
150
°
F (60
°
C to 66
°
C) range regardless of inlet water flow or temperature as long as a minimum flow for
a given temperature is met (Figure 2-5, page 19 and Figure 2-6, page 19). See Section 5, for adjustment
instructions and maximum allowable lubricant temperature.
ELECTRICAL WIRING - Standard Units - The Electra-Saver 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 4 starter and control enclosure. See “Location” paragraph, page 13, 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
must 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 according to motor starter manufacturer’s standard), a
200 (208) volt coil, and three (3) overload heaters for 200 (208) volt 200-300 HP (150-225 kW), 1.15
service factor motor. The overload heaters are to be selected according to starter manufacturer’s tables
based on motor nameplate full load amperage.
Electrical shock can cause injury or death. Open main disconnect switch,
lockout and tagout before working on control box.
GROUNDING - Equipment must be grounded in accordance with Table 250-95 of the National Electrical
Code.
Failure to properly ground the compressor package could result in injury or
death. Install ground wiring in accordance with the National Electrical Code
and any applicable local codes.
MOTOR LUBRICATION - Long time satisfactory operation of an electric motor depends in large
measure on proper lubrication of the bearings. The following charts show recommended grease qualities
and regreasing intervals for ball bearing motors. For additional information refer to the motor
manufacturer’s instructions. The following procedure should be used in regreasing:
1.
Stop the unit.
2.
Disconnect, lockout and tagout the unit from the power supply.
3.
Remove the relief plug and free hole of hardened grease.