Trane CenTraVac CDHF Series, Инструкция по установке, эксплуатации и обслуживанию

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CDHF-SVX01N-EN 41
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 the figure in
“Factory-applied
Insulation,” p. 41 .
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.
N No otte 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.
IIm mp po orrtta an ntt:: Do NOT insulate the motor housing, unit
wiring, or sensor modules.
N NO OT TIIC CE E
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Table 13. Evaporator insulation requirements
EVSZ (a)
Standard Unit
Free Cooling
3/4 in. (19.05 mm) (a)
Insulation(Square
Feet)
3/8 in. (9.525 mm)
Insulation (b) (Square
Feet)
3/4-in. (19.05 mm)
Insulation (a)
(Square Feet)
3/8 in. (9.525 mm)
Insulation (b) (Square
Feet)
210 Duplex
1270 193 Not Available Not Available
250 Duplex
1308 193 Not Available Not Available
250 Duplex Medium
1410 280 Not Available Not Available
250 Duplex Extended
1500 280 Not Available Not Available
Note: 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
= 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,
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.
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