1100E, 1500E, 1800E USER MANUAL SECTION 4
42
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.
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 separator/
sump 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 separator/sump. 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. See Figure 4-1.
P
IPE 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 Separator/Sump Tank
An auxiliary separator/sump tank should be used in
cases where large demand swings are expected.
This is not necessary with a variable speed design.
I
SOLATION 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, 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 separator/sump.
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.
NOTE
Variable speed drive compressors are
NEMA 12 rated and must not be installed
outside or exposed to the elements.
NOTE
Compressors with integral dryers can be
damaged by ambient temperatures below
freezing. The dryer electrical system is
Nema 12 rated and should not be installed
outdoors or in an unheated space, subject
to freezing temperatures.
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.
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