64
CG-SVX039C-GB
Optional Free-Cooling
Chiller Integrated Free-Cooling
Operation Mode
The power of chiller integrated free-cooling relies on the
chiller control to maximize the use of free-cooling when
outdoor temperatures are favorable. The choice between
compressor refrigeration and Free-cooling refrigeration will
be made and activated depending on three temperature
measurements:
• The ambient air temperature
• The evaporator entering and leaving
temperature
• The chilled water set point
Free-cooling coils are fit in series with the evaporator, and
a set of water regulation valves allows the coils to be by-
passed when they are no longer needed due to outdoor
temperatures which are favorable for free-cooling.
Three operating modes can be differentiated:
1. Summer operation or Compressor refrigeration mode
In this operation mode, ambient temperature is
higher than the temperature of the fluid entering the
evaporator. Free-cooling is not activated, compressors
are running, and control is done in function of the fan/
compressor logic of operation.
2. Mid-season operation or combined refrigeration +
Free-cooling mode
In this operation mode, free-cooling will be enabled
whenever the outdoor temperature is below the
evaporator entering water temperature. The operating
logic is described below. The free-cooling system
operates combined with the mechanical compressor
refrigeration. Most of the time, free-cooling will only
partially cover the required cooling duty. In other
words, mechanical refrigeration will complete what
has already been delivered by free-cooling.
3. Winter operation or full free-cooling mode
Below a certain ambient temperature, and depending
on the chilled water set point requested, the entire
cooling duty is delivered by the free-cooling system.
Compressors do not operate, since the free-cooling
coils will be able to deliver the requested chilled
water temperature. The regulation of the capacity is
described in the next section. In this mode, only fans
are running.
General Information
The chiller integrated free-cooling system fluid based
consist in a set of “Macro-channels” or “Radiators” coils,
fit in the same frame than the MCHE condenser coils of the
chiller refrigeration circuit. Free-cooling coils will be full
aluminium, flat radiator design type, with low air pressure
drop to avoid fan performance degradation.
Free-cooling coils are fit in series with the evaporator, and
a set of water regulation valves ensures the system to
reach the required free-cooling capacity.
Figure 21 – Total Free-Cooling option
If there is a need to get a definition for partial heat recovery coil distribution, please contact the Trane sales office.
CGAF CGAF CGAF CGAF CGAF CGAF CGAF CGAF CGAF CGAF
080 090 100 110 130 140 150 165 180 190
Digit 12=H or Digit 12=A
Coils quantity 4 6 6 6 6 8 8 8 10 10
Summer nominal water ow L/s 13.7 15.7 17.4 19.4 21.3 23.2 25.4 27.2 29.8 31.6
Summer & winter unit pressure drop kPa 83.3 90.7 96.0 107.6 76.0 57.6 62.6 70.8 78.3 83.6
Glycol Free - Free-Cooling Capacity kW 174.4 261.9 264.6 267.1 260.4 363.7 368.5 371.6 445.7 449.2
Glycol Pump Motor Power kW 2.3 2.56 2.56 2.56 2.56 3 3 3 3 3
Glycol Pump Rated Amps A 4.3 5.8 5.8 5.8 5.8 6.15 6.15 6.15 6.15 6.15
FC BPHE Model
B427M2+
M1x118
B427M2+
M1x152
B427M2+
M1x152
B427M2+
M1x152
B427M2+
M1x152
B427H+
M2x260
B427H+
M2x260
B427H+
M2x260
B427H+
M2x294
B427H+
M2x294
Antifreeze Heater** W 480 480 480 480 480 640 640 640 640 640
Additional shipping weight kg 405 520 520 520 520 720 720 720 835 835
Glycol content L 167 227 227 227 227 304 304 304 363 363
(1) FC winter mode condition: EWT=20C, Amb T=0C
(2) 30% EG is used in glycol loop for GFFC
(3) ** = No heater on BPHE water inlet, Antifreeze Heater (W) minus 60W for 080 to140 Units & 120W from 150 to 190 Units.
Table 17 – General data for free-cooling option sizes 080-190 (Continued)
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