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7.0 PRINCIPLES OF OPERaTION
still permits manual control of the dryer via the On/Off
pushbutton on the local control panel. Note that if the dryer
was turned “On” from the remote switch and then turned
“Off” via the local control panel, the remote switch must be
turned “Off” and then “On” to reinstate the dryer.
7.6.6.3 auto Restart
Should the dryer lose power while in the “On” mode, the
dryer will revert to the “On” mode once power is restored.
Similarly, should power be removed from the dryer while
the dryer is in the “Off” mode, the dryer will remain in the
“Off” mode once power is restored until the On/Off switch is
depressed or the remote switch is closed.
8.0 INSTaLLaTION aND INITIaL STaRT-UP
8.1 LOCaTION aND MOUNTINg
The dryer should not be located in an area where ambient
temperature is likely to exceed 113°F (45°C) or be less
than 50°F (10°C). The dryer must be located in an area
that provides sufficient clearance from walls and other
adjoining equipment to allow easy access for servicing
and maintenance requirements. A minimum of 18 inches is
required to allow free flow of air to the condenser inlet.
On installations with a relatively steady flow rate, the
dryer is normally connected after the air receiver. If loads
fluctuate widely, the dryer should be positioned ahead of
the receiver and sufficient storage capacity downstream is
necessary to prevent excessive air flow through the dryer.
When installed after any compressor that causes
significant vibration or air pulsation, such as reciprocating
compressors, proper vibration isolation and pulsation
dampening devices should be added to protect the dryer.
NOTICE
Failure to comply to the above instructions may
result in equipment malfunction and will void
warranty.
NOTICE
always use a backup wrench when making any
threaded connection to the dryer. Failure to use a
backup wrench may result in damaged tubing and
components internal to the cabinet.
8.2 PIPINg aND VaLVES
Install piping, fittings and accessories as required for
specific site conditions and requirements. Figure 3 indicates
a typical piping arrangement for a refrigerated dryer,
including dryer and filter bypasses. This figure can be used
as a guide for valve and accessory placement in the system.
Ingersoll Rand NVC200-400 models come factory installed
with a drain isolation valve (D). The isolation valve permits
maintenance of the automatic drain without isolating
air flow to the dryer. To operate dryer, all valves shown in
Figure 3 are to be closed except valves (B), (C) and (D). Valve
(A) is used for bypass purposes and valve (E) is for test and
manual drain purposes.
8.3 FILTRaTION
To protect the air dryer from gross contamination
associated with compressor oil and debris and ensure
maximum dryer performance, a pre-filter is recommended.
Pre-filters and post-filters sized to your drying application
can be provided by Ingersoll Rand and are available
factory installed. Call your local distributor to select the
filter that best suits your filtration requirements. In addition
to air filtration, condensate discharge oil/water separators
are also available to address stringent EPA regulations.
