CVHE-SVN02D-EN
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Insulation
Table 8. CVHE, CVHF and CVHG evaporator insulation requirements
Standard Unit Free Cooling
EVSZ 3/4" [19 mm] 3/8" [9.5 mm] 3/4" [19 mm] 3/8" [9.5 mm]
(Note 1) Insulation Insulation Insulation Insulation
(Note 2) (Note 3) (Note 2) (Note 3)
(Square Feet) (Square Feet) (Square Feet) (Square Feet)
032S 337 52 347 74
032L 365 52 377 74
050S 385 63 398 72
050L 420 63 436 72
080S 505 84 515 97
080L 553 84 566 97
142M 555 98 555 133
142L 578 98 578 133
142E 603 104 629 133
210L 700 98 710 133
210 D 1220 193 Not Available Not Available
250 D 1308 193 Not Available Not Available
250 E 770 97 Not Available Not Available
Notes:
1. EVSZ = Evaporator Shell Size, L = Long Shell, S = Short Shell
2. D = Duplex, M = Medium, E = Extended
3. 3/4" [19 mm] sheet insulation is installed on the evaporator, evaporator water boxes, compressor motor,
suction elbow and suction cover as indicated in Figure 13.
4. 3/8" [9.5 mm] sheet insulation is installed on all economizers. All liquid lines and other pipes require the
use of 1/2" [13 mm] pipe insulation or 3/8" [9.5 mm] sheet insulation. Copper oil eductor tube lines require
pipe insulation.
5. Refrigerant Pump equipped units are NOT insulated on the motor or refrigerant drain lines.
Unit Insulation Requirements
Factory-installed insulation is
available as an option for all CVHE,
CVHF and CVHG units.
In those instances where the chiller
is not factory-insulated, install
insulation over the areas outlined
and highlighted with dashed lines
Figure 14. It may also be necessary
to insulate the compressor suction
cover and motor barrel if the unit is
installed in an area subjected to high
humidities.
Insulate both 1/4" [6.4 mm] eductor
lines, one from the suction cover and
one from the evaporator to prevent
sweating.
The quantities of installation
required based on unit size and
insulation thickness are listed in
Table 8. Insulation thickness is
determined at normal design
conditions which are:
- 85°F
- 75% Relative Humidity
Note: If the unit is not factory-
insulated: Install insulation around
the evaporator bulbwells; and,
ensure that the bulbwells and
connections for the water box drains
and vents are still accessible after
insulation is applied. The sensor
modules (LLID's) and
interconnecting four wire cable (IPC
Buss) must be raised up above the
field installed insulation. Secure the
IPC Buss to the insulation top/ outer
surface after insulation is completed.
Do not insulate over the wiring or
sensor devices.
CAUTION
Insulation Damage!
To prevent damage to factory-
installed insulation:
- Do not allow the insulation to be
exposed to excessive sunlight.
Store indoors or cover with canvas
to prevent exposure.
- Do not use thinners and solvents
or other types of paint. Use only
water base latex.
Failure to follow these
recommendations may result in
insulation damage.
Insulation Thickness
Requirements
Factory applied insulation. All low
temperature surfaces are covered
with 3/4” (19mm) Armaflex II or
equal (thermal conductivity = 0.28
BTU/hr-ft sq.) (1.59 W/m2-K),
including the evaporator, water
boxes and suction elbow. The
economizer and motor cooling lines
are insulated with 3/8” (10mm) and
1/2” (13mm) insulation respectively.
Insulation is Armaflex or equivalent
closed cell elastomeric insulation, to
prevent sweating up to a dew point
rating of 74°F K = 0.25. Chillers in
high humidity areas or ice storage,
low leaving water temperature (less
than 36 degree chilled water
temperature/glycol) units may
require double thickness to prevent
sweating.
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