Control And Safety Calibrations - Trane CGCN Installation Operation & Maintenance

water flow rates result in excessive water velocity and possible erosion / corrosion. In the first case low speed 'can
lead to underperformance and easy scaling, and in the second case' must install pumps with high prevalence
energetically little valid.

Control and safety calibrations

SCALING CORRECTION SCHEDULES
The following table provides information on the organs of action and safety of the unit. Always verify that the unit is
within the limits imposed by pressure switches or pressure transducers and periodically check the calibration.
SCROLL
In order to calculate performance with glycoled solutions, multiply main sizes by respective coefficients.
Ethylene glycol correction table
% Ethylene
glycol weight
Freezing (°C)
temperature
Suggested (°C)
security limit
Cooling
capacity
coefficient
Power input
coefficient
Flow rate
coefficient
Pressure drop
coefficient
Glycol percentage depending on freezing temperature
Freezing
temperature (°C)
% Ethylene glycol
Flow rate coefficient
Fouling factor correction table
Fouling Factor
F.F.
[m^2°C*W]
0
1,80E-05
4,40E-05
8,80E-05
1,32E-04
1,72E-04
A factor
B factor
T min
T max
RELIEF VALVE HIGH PRESSURE SWITCH
45 BAR
5% 10% 15%
-2 -3.9 -6.5
3 1
0.995 0.99 0.985
0.997 0.993 0.99
1.003 1.01 1.02
1.039 1.06 1.09
0 -5
5% 12%
1.02 1.033
Plant side cold heat-exchanger
A1 B1
1,00 1,00
1,00 1,00
1,00 1,00
0,96 0,99
0,94 0,99
0,93 0,98
Capacity correction factor
Compressor power input correction factor
Minimum evaporator outlet water temperature increase
Maximum condenser outlet water temperature decrease
41 BAR
20% 25%
-8.9 -11.8
-1 -4 -6
0.981 0.977
0.988 0.986
1.033 1.05
1.118 1.149
-10 -15
20% 28%
1.05 1.072
Tmin A2
0,00 1,00
0,00 1,00
0,00 0,99
0,70 0,98
1,00 0,96
1,50 0,95
ANTIFREEZE
4°C
30% 35%
-15.6 -19
-10 -14
0.947 0.971
0.984 0.982
1.072 1.095
1.182 1.211
-20
35%
1.095
Plant side hot heat-exchanger
B2 Tmax
1,00
1,00
1,03
1,04
1,05
1,06
40%
-23.4
-19
0.968
0.981
1.124
1.243
-25
40%
1.124
0,00
0,00
1,00
1,50
2,30
3,00