Outdoor Installation (Sheltered)
Many times a compressor must be installed outside due
to available space or other jobsite conditions. When this is
necessary, there are certain items that should be
incorporated into the system to help ensure trouble-free
operation. The unit must be purchased with a TEFC motor.
The standard machine has NEMA 4 rated controls, which
are watertight.
NOTE
Variable speed drive compressors are
NEMA 12 rated and must not be
installed outside or exposed to the
elements.
The compressor should be on a concrete pad, which is
designed to drain water away from it. If the concrete pad
is sloped, then the compressor must be mounted so that
it is level. The base or skid must be sealed where it
contacts the concrete pad.
A weatherhood option should be selected to prevent direct
rain and snow from falling on the unit. If local weather
conditions can be extreme such that direct rain or snow
may fall on the unit, it should be in a fully enclosed room
or building.
If installed under a shelter, air-cooled machines must be
positioned in a way that prevents air recirculation (i.e., hot
exhaust being allowed back to the system air inlet).
In installations that include more than one compressor, hot
air exhaust should not be directed toward the fresh air
intake of the second unit or an air dryer.
A standard machine installed outside must not be started
or run if the ambient temperature in and around the
compressor drops or may drop below 35˚F (1.7˚C).
For installation in a below freezing climate, a low ambient
option with heat tracing and a receiver tank heater must
be installed.
4.3 SERVICE AIR PIPING
Review carefully the total air system before installing a new
compressor. Items to consider for the total air system
include liquid carryover, pipe sizing, and the use of an
auxiliary receiver. The installation of a drip leg or multiple
drip legs, installation of a line filter(s) and the installation
of isolation valve or valves. These considerations are
important to ensure a safe and effective system.
NOTE
Discharged air contains a very small
amount of compressor lubricating oil,
and care should be taken to ensure
that this oil would not interfere with
downstream equipment.
Pipe Sizing
Pipe should be sized at least as large as the discharge
connection of the compressor. Piping and fittings should
all be suitably rated for the discharge pressure.
Use of Auxiliary Receiver Tank
An auxiliary receiver tank should be used in cases where
large demand swings are expected. This is not necessary
with a variable speed design.
Isolation Valve(s)
If isolation of the compressor from the service lines is
required, isolation valves should be installed close to the
discharge of the compressor. They should be installed
with drip legs that drain sloping downward from the base
in order to drain properly. Install a vent to the piping
downstream of the minimum pressure check valve on the
separator tank, and upstream of the first isolation valve.
When two compressors are operated in parallel, provide
an isolation valve and a drain trap for each compressor
before the common receiver tank.
A built-in after-cooler reduces the discharge air
temperature below the dew point. For most ambient
conditions, considerable water vapor is condensed. To
remove the condensation, each compressor with built-in
after-cooler is supplied with a combination condensate
separator/trap. A drain line should be installed on the
condensate drain.
Fluid Containment
Compressors are equipped with a fluid containment pan
to catch any fluid in the event of a leak or spill. The drain
for the pan is located on the air intake end of the machine.
For indoor installations, the drain should be plugged to
contain fluids. For outdoor applications, the drain must be
connected to a separate, customer supplied system to
allow rainwater or any accumulated compressor fluid to
drain out.
SECTION 4
32
1100e, 1500e, 1800e Operator’s Manual and Parts List
®
SULLAIR
®
Summary of Contents for 1107e
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