Insulation; Unit Insulation Requirements; Insulation Thickness Requirements; Factory Applied Insulation - 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 Figure 28, p.
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.
Table 13. Evaporator insulation requirements
EVSZ (a)
032 Short
032 Long
050 Short
050 Long
080 Short
080 Long
142 Medium
142 Long
142 Extended
210 Long
250 Extended
N N o o t t e e : : Chillers equipped with refrigerant pumps 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

All low-temperature surfaces are covered with 3/4 in.
(19.05 mm) Armaflex® II or equal (thermal conductivity
2
= 0.28 Btu/h-ft [1.59 W/m
44
45.
Standard Unit
3/4 in. (19.05 mm) (a)
Insulation(Square
Feet)
337
365
385
420
505
553
555
578
603
700
770
2
-K]), including the
N N o o t t e e : : 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
(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.
I I m m p p o o r r t t a a n n t t : : Do NOT insulate the motor housing, unit
E E q q u u i i p p m m e e n n t t D D a a m m a a g g e e ! !
F F a a i i l l u u r r e e t t o o r r e e m m o o v v e e t t h h e e s s t t r r a a i i n n r r e e l l i i e e f f w w i i t t h h t t h h e e s s e e n n s s o o r r
c c o o u u l l d d r r e e s s u u l l t t i i n n e e q q u u i i p p m m e e n n t t d d a a m m a a g g e e . .
D D o o N N O O T T a a t t t t e e m m p p t t t t o o p p u u l l l l s s e e n n s s o o r r b b u u l l b b t t h h r r o o u u g g h h t t h h e e
s s t t r r a a i i n n r r e e l l i i e e f f ; ; a a l l w w a a y y s s r r e e m m o o v v e e t t h h e e e e n n t t i i r r e e s s t t r r a a i i n n r r e e l l i i e e f f
w w i i t t h h t t h h e e s s e e n n s s o o r r . .
3/8 in. (9.525 mm) 3/4-in. (19.05 mm)
Insulation (b) (Square
Feet)
52
52
63
63
84
84
98
98
104
98
97
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,
wiring, or sensor modules.
N N O O T T I I C C E E
Free Cooling
3/8 in. (9.525 mm)
Insulation (a) Insulation
(Square Feet)
347
377
398
436
515
566
555
578
629
710
780
(b) (Square
Feet)
74
74
72
72
97
97
133
133
133
133
133
CVHE-SVX02M-EN