Emerson AMI User Guide

Instruction Sheet

PA-00134
May 2008

AMI Moisture Liquid Indicators

Type AMI Moisture Liquid Indicators

General Information

1. Only one indicator 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.

2. The dry-caution-wet system operating conditions are
then easily determined by matching the element color
with the three colors displayed on the reference label.
Colors change as often as the system moisture
content changes.

Important: 12 hours is recommended after installation of
the AMI Moisture Liquid Indicator before attempting to
determine the system moisture content.
Note: The indicator element may indicate an unsafe
condition before installation. This is normal and simply
reflects the room humidity condition.

3. The exclusive fused glass eye piece in the AMI
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 AMI Moisture Liquid Indicator may be installed in
any position. It is normally installed downstream from
the filter-drier and immediately ahead of the TXV.

2. Warning: AMI-1SS and 2S series indicators should
be disassembled before being brazed into the line.
Failure to disassemble could result in damage to the
“O” ring seal. The simplified construction and “O” ring
seal make it very easy to remove and replace the
indicator assembly. As the AMI-1SS and 2S must be
disassembled before installing the lens, assembly is
only finger tight.

3. Forged brass construction permits use of any soft
solder or commonly used brazing alloys. When
soldering or brazing, direct the flame away from the
AMI body. Use wet rags or chill block to prevent
damage to body or label. Excessive heat may cause
the AMI body to warp.

4. Replace the indicator assembly.

5. Replace sightglass cover to maintain indicating
sightglass clean when not being viewed.

Caution:
assembling. The “O” ring seal can be distorted and
result in leaking if excessive tightening is applied.

The AMI product has a 650 psig maximum working
pressure. Following installation of an AMI or an EK Filter­Drier, 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.

Do not exceed 70 inch lbs. torque when re-

www.emersonclimate.com/flowcontrols

11911 Adie Road P.O. Box 411400 St. Louis MO 63141 USA CUSTOMER SERVICE [phone]

CAUTION: This product is intended for use on all CFC,
HCFC and HFC except R123. 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 A2,
A3, B2 and B3.