Install Instructions

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HMI Moisture Liquid Indicator
HMI Moisture Liquid Indicator
Instruction Sheet
PA-00228
January 2008
11911 Adie Road P.O. Box 411400 St. Louis MO 63141 USA CUSTOMER SERVICE [phone]
Figure 1
General Information
Only one indicated element is required for all common
refrigerants. This element is highly sensitive to moisture
and will gradually change color in direct relation to an
increase or decrease in the moisture content of the
system. The dry-caution-wet system operating conditions
are then easily determined by matching the element
color with the two colors displayed on the reference label.
Colors change as often as the system moisture content
changes.
MWP - 680 psig
IMPORTANT: 12 hours is recommended after installation
of the Moisture Liquid Indicator before attempting to
determine the system moisture content.
Safety Instructions
1. Read all instructions thoroughly. Failure to comply
can result in valve failure, system damage, or
personal injury.
2. The indicator element will indicate an unsafe
condition before installation. This is normal and
simply reflects the room humidity condition.
3. The exclusive fused glass eyepiece in the Moisture
Liquid Indicator provides a clear, wide-angle view of
the liquid refrigerant flow so that bubbles or flash gas
are easily seen. This indicates an insufficient system
charge, low head pressure, insufficient liquid
subcooling or some form of restriction in the liquid
line.
Installation Instructions
1. The Moisture Liquid Indicator may be installed
anywhere in the liquid line and in any position. It is
normally installed downstream from the filter-drier
and immediately ahead of the thermal expansion
valve.
2. Extended cooper connections with bar stock body
permits use of any soft solder or commonly used
brazing alloys. When soldering or brazing, direct the
flame away from the body. Wet rags or chill blocks
must be used when brazing to prevent damaging the
Moisture Liquid Indicator. See Figure 1.
Following installation of a Moisture Liquid Indicator or an
EK filter-drier, the system should be allowed to reach
equilibrium as previously noted. If a caution or wet
system condition is still indicated following this period,
the filter-drier or the replaceable cores should be
replaced. This practice should be continued until the
system has dried and a safe condition is indicated.
CAUTION: This product is intended for use on all CFC,
HCFC and HFC refrigerants. Do not use on any
unlisted fluid media without prior approval of the
Emerson Climate Technologies Flow Controls
Division Applications Engineering Department. Use
on fluids not listed above could result in deterioration
of the moisture indicator element. Not for use on
refrigerants classified by ASHRAE standard 34 as
Class A1/A2, A2, A3, B2 and B3.