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FORM 155.17-N1
ISSUE DATE: 4/1/2013
YORK recommends that all ParaFlow™ chiller/heat-
er absorption units be insulated properly for the fol-
lowing reasons:
1. Optimize op er at ing performance
2. Ensure the safe ty of op er at ing and plant person-
nel
3. Prevent unit sweating
4. Prevent crystallization for up to eight hours dur-
ing a pow er failure.
Johnson Controls performance ratings are based on a
prop er ly in su lat ed chiller. Proper insulation limits the
heat loss from the chiller to its surroundings. Insula-
tion also protects personnel from the hot surfaces, such
as the generator shell and steam piping, and is often
required for safety codes. Lastly, insulation, when ap-
plied properly, will prevent crystallization during a
power failure for up to eight hours with a minimum
room temperature of 70°F.
Insulating an absorber chiller requires special con sid-
er ation to three separate sections of the chiller: Hot,
Cold, and Intermediate temperature surfaces. By in-
sulating the hot surfaces, heat loss to the equipment
room is min i mized, thereby maximizing efficiency and
preventing hazardous working conditions. Cold insu-
lation is ap plied to a chiller to prevent sweating. When
a chiller is op er at ing, moisture in the surrounding air
may condense on the cold surfaces of the evapora-
tor and refrigerant side and collect on the equipment
room floor causing unsafe con di tions. The last critical
area for insulation are areas that contain weak lithium
bromide solution. These areas are more susceptible to
crystallization when their tem per a ture lowers. A prop-
erly insulated chiller will provide safe, reliable and ef-
ficient operation throughout the life of the equipment.
For hot surfaces, YORK recommends using 2 inch
thick, 3 pound density fiberglass insulation. Hot sur-
faces that need insulation are the generator and con-
necting piping. These areas are filled in with a charcoal
gray in the in su la tion drawings located in Appendix C
- Insulation Illustrations of this document.
JOHNSON CONTROLS
SECTION 30 – INSULATION
For cold surfaces, YORK recommends using 3/4 inch,
closed-cell foam insulation. Cold surfaces that need
foam insulation are the evaporator shell, refrigerant
piping, refrigerant pumps, and the refrigerant tank.
Cold sur fac es are indicated on the insulation drawings
with a light gray color.
For intermediate temperature surfaces, Johnson Con-
trols rec om mends using 1 inch thick, 2 pound density
fiberglass in su la tion. These surfaces include the ab-
sorber pumps and piping. The intermediate surfaces
are marked with a medium gray color on the insulation
diagrams.
INSULATION TIPS
Before insulating an absorption chiller, see the "Other
Insulation Guidelines" section below for some helpful
hints and warnings about applying insulation.
Insulation must NOT be applied to the chiller until
the start-up has been successfully completed by a
qualified Johnson Controls service technician. Ap-
ply removable insulation to the chiller surfaces that
must be removed for ser vic ing. The surfaces of the
chiller that must have removable insulation include
the refrigerant and solution pump motors, valves,
sight glasses, thermowells, isolation valves, flanges
and other piping connections. For de tailed insulation
drawings, see Appendix C - Insulation Illustrations of
this doc u ment.
Acceptable means of mounting insulation to the chiller
surfaces include bonding agents, wires, and bands. In-
su la tion pins are also acceptable provided they are not
weld ed to the chiller surface. An acceptable high tem-
per a ture epoxy for installing insulation can be found in
the notes of the Chemicals and Compounds section of
YORK Renewal Parts Form 155.17-RP3. The surface
of the insulation should be sealed vapor-tight to pre-
vent sweating and mildew underneath the insulation.
All seams should be filled in using insulation tape or
ther mal mastique compound. Aluminum facing pro-
vides an additional layer of protection in high-temper-
ature areas and provides a quality finish to the job.
30
85
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