Insulation . Trane CVHE-SVX02M-EN, CVHG, CVHF, CVHE
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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
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 the following table. Insulation 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
Operation outside of normal design conditions as defined in this section may require additional insulation; contact Trane for further review.
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
(Low Level Intelligent Devices [LLIDs]) and interconnecting four-wire cable inter-processor communication (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.
wiring, or sensor modules.
ov e tth e sse orr..
Table 13.
Evaporator insulation requirements
EVSZ (a)
Standard Unit
Insulation(Square
Feet)
3/8 in. (9.525 mm)
Insulation (b)
Feet)
(Square
337 52
Free Cooling
3/4-in. (19.05 mm)
(Square Feet)
3/8 in. (9.525 mm)
Feet)
(Square
347 74 032 Short
032 Long
050 Short
050 Long
080 Short
080 Long
365
385
420
505
553
52
63
63
84
84
377
398
436
515
566
74
72
72
97
97
142 Medium
142 Long
142 Extended
210 Long
555
578
603
700
98
98
104
98
555
578
629
710
133
133
133
133
250 Extended 770 97 780 133
otte
Chillers equipped with refrigerant pumps are NOT insulated on the motor or refrigerant drain lines.
(a)
(b)
3/4-in. (19.05-mm) sheet insulation is installed on the evaporator, evaporator waterboxes, suction elbow, and suction cover.
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
All low-temperature surfaces are covered with 3/4 in.
(19.05 mm) Armaflex® II or equal (thermal conductivity
= 0.28 Btu/h-ft
2
[1.59 W/m
2
-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.
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 (23.3°C),
K = 0.25. Chillers in high humidity areas or ice storage,
44 CVHE-SVX02M-EN
low leaving water temperature (less than 36°F [2.2°C] chilled water temperature/glycol) units, may require double thickness to prevent formation of condensation.
•• D
•• D o n ag e..
ag e tto xp ossu
Figure 28.
Recommended area for unit insulation
• Bulbwells, drain, and vent connections must be accessible after insulating.
• All units with evaporator marine waterboxes wrap waterbox shell insulation with strapping and secure strapping with seal.
• Evaporators with ASME nameplates must have insulation cut out around the nameplate. Do NOT glue insulation to the nameplate.
• Apply 2-in. (50.8-mm) wide black tape on overlap joints. Where possible apply 3-in. (76.2-mm) wide strip of
0.38-in. (9.7-mm) thick insulation over butt joint seams.
• Insulate all economizer supports.
CVHE-SVX02M-EN 45
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