Trane AquaStream 2 CGWN Series - Minimal Installation Water Content; Parameters Which Influence the Water Temperature Stability; Minimum Water Volume for a Comfort Application

13CG-SVX06F-GB
Minimal installation water
content
The water volume is an important
parameter because it allows a
stable chilled water temperature and
avoids short cycle operation of the
compressors.
Parameters which influence
the water temperature
stability
• Water loop volume
• Load fluctuation
• Number of capacity steps
• Compressors rotation
• Dead band (adjusted on chiller
controller)
• Minimum time between 2 starts of
a compressor
Minimum water volume for
a comfort application
For comfort application we can
allow water temperature fluctuation
at part load. The parameter to
take into account is the minimum
operating time of the compressor.
In order to avoid lubrication problem
on a scroll compressor it must run
at least 2 minutes (120 seconds)
before it stops.
The following table gives the
minimal installation water content
recommended according to all these
parameters.
Installation
Table 2 - Minimal water content
Notes
(1) Minimum water loop volume in order to obtain maximum +/- 1°C chilled water temperature fluctuation vs. Chilled
water set-point
(2) Minimum water loop volume in order to obtain maximum +/- 1.5°C chilled water temperature fluctuation vs.
Chilled water set-point
(3) Minimum water loop volume in order to obtain maximum +/- 2°C chilled water temperature fluctuation vs. Chilled
water set-point
This table is estimated with
- Condenser : Water 30°/35°C
- Evaporator : Water 12°/7°C
Confort Application Process cooling Application
2°C Dead
band (1)
3°C Dead
band (2)
4°C Dead
band (3)
2°C Dead
band (1)
3°C Dead
band (2)
4°C Dead
band (3)
CGWN - CCUN 205 660 l 440 l 330 l 1160 l 730 l 530 l
CGWN - CCUN 206 670 l 450 l 340 l 1160 l 740 l 540 l
CGWN - CCUN 207 650 l 440 l 330 l 1100 l 710 l 520 l
CGWN - CCUN 208 880 l 580 l 440 l 1520 l 960 l 710 l
CGWN - CCUN 209 1060 l 700 l 530 l 1860 l 1170 l 860 l
CGWN - CCUN 210 1080 l 720 l 540 l 1870 l 1190 l 870 l
CGWN - CCUN 211 1260 l 840 l 630 l 2220 l 1400 l 1020 l
CGWN - CCUN 212 1260 l 840 l 630 l 2170 l 1380 l 1010 l
CGWN - CCUN 213 1050 l 700 l 530 l 1760 l 1130 l 830 l
CGWN - CCUN 214 1270 l 850 l 640 l 2150 l 1370 l 1010 l
CGWN - CCUN 215 1240 l 820 l 620 l 2060 l 1330 l 980 l