Insulation; Unit Insulation Requirements; Insulation Thickness Requirements - Trane CVHE Installation, Operation And Maintenance Manual

Insulation

Unit Insulation Requirements

Factory-installed insulation is available as an option for all
units. Factory installation does not include insulation of
the chiller feet; if required, insulation for chiller feet is
provided by others. In applications where the chiller is not
factory-insulated, install insulation over the areas outlined
and highlighted with dashed lines as shown in
p. 36.
Insulate all 1/4-in. (6.35-mm) eductor lines, one from the
suction cover and one from the evaporator to prevent
sweating.
The quantities of insulation required based on unit size
and insulation thickness are listed in
thickness is determined at normal design conditions which
are:
• standard comfort-cooling leaving chilled water
temperature
• 85°F (29.4°C) dry bulb ambient temperature
• 75 percent relative humidity
Table 10. Evaporator insulation requirements
3/4 in. (19.05 mm)
(a)
EVSZ (Square Feet)
032 Short
032 Long
050 Short
050 Long
080 Short
080 Long
142 Medium
142 Long
142 Extended
210 Long
250 Extended
Note: Refrigerant pump equipped units are NOT insulated on the motor or refrigerant drain lines.
(a) 3/4-in. (19.05-mm) sheet insulation is installed on the evaporator, evaporator waterboxes, suction elbow and suction cover.
(b) 3/8-in. (9.525-mm) sheet insulation is installed on all economizers. All liquid lines and other pipes require the use of 1/2-in.
(12.7-mm) pipe insulation or 3/8-in. (9.525-mm) sheet insulation. Copper oil eductor tube lines require pipe insulation.
Insulation Thickness
Requirements
Factory applied insulation.
surfaces are covered with 3/4 in. (19.05 mm) Armaflex
or equal (thermal conductivity = 0.28 Btu/h-ft
2
[1.59 W/m -K]), including the evaporator, waterboxes and
suction elbow. The economizer and motor cooling lines
are insulated with 3/8 in. (9.525 mm) and 1/2 in. (12.7 mm)
insulation respectively.
CVHE-SVX02H-EN
Figure 23,
Table 10. Insulation
Standard Unit
3/8 in. (9.525 mm)
(a)
Insulation Insulation
(Square Feet)
337
365
385
420
505
553
555
578
603 104
700
770
All low-temperature
2
Operation outside of normal design conditions as defined
above may require additional insulation; contact Trane for
further review.
Note: If the unit is not factory-insulated: install insulation
around the evaporator bulbwells and ensure that
the bulbwells and connections for the waterbox
drains and vents are still accessible after insulation
is applied. The sensor modules (LLIDs) and
interconnecting four wire cable (IPC bus) must be
raised up above the field-installed insulation.
Secure the IPC bus to the insulation top/outer
surface after insulation is completed.
Important: Do not insulate the motor housing, unit
Equipment Damage!
Failure to remove the strain relief with the sensor could
result in equipment damage. Do NOT attempt to pull
sensor bulb through the strain relief; always remove
the entire strain relief with the sensor.
Free Cooling
3/4-in. (19.05 mm)
(b) (a)
Insulation
(Square Feet)
52 347
52 377
63 398
63 436
84 515
84 566
98 555
98 578
629
98 710
97 780
The insulation is Armaflex or equivalent closed cell
elastomeric insulation to prevent the formation of
condensation 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°F [2.2°C] chilled water
®
II
temperature/glycol) units may require double thickness to
prevent formation of condensation.
wiring, or sensor modules.
NOTICE:
3/8 in. (9.525 mm)
(b)
Insulation
(Square Feet)
74
74
72
72
97
97
133
133
133
133
133
35