Trane CXAU - Circulating Water Treatment Requirements

20
PKGP-SVX19A-EN
Installation - Mechanical
SV-1
SV-N
Return Water
Supply Water
Host Unit
Slave Unit 1
Slave Unit N
29.
Installation of total leaving water temperature sensor
a). The total leaving water temperature sensor should be placed in the straight pipe section at a distance of more than 2m
from the water outlet, not on the elbow, and more than 1m away from the elbow to ensure uniform temperature mix at the
water outlet; For hot water application, the probe needs to be installed lower than the hot water tank.
b). When the total leaving water temperature probe sleeve is installed in the water pipeline, the depth of the inserted water
pipe should be 2/3 of the diameter of the water pipe, and it should be installed in the horizontal of the water pipe; When
the total leaving water temperature probe sleeve is installed in the hot water tank, the probe sleeve needs to be inserted in
the lower position of the side of the tank.
c). After the total leaving water temperature probe is inserted, the sleeve should be lled with heat transfer silica gel and
covered with waterproof material to prevent water from entering the sleeve.
30.
Waterway auxiliary electric heater (customer-installed)
When unit is in heating mode, if the leaving water temperature is less than the setting by 8°C, turn on the electric heater. When
the leaving water temperature increases higher than setting valve minus 2.5°C, turn o󰀨 the electric heater.
Circulating water treatment requirements
Water quality requirement
Items Unit Allowable Value
Trend
Corrosion Fouling
Benchmark
PH Value (25°C) 7.5-9.0 ○
Conductivity (25°C) μS/cm <800 ○
Chloridion Cl- mg/L <200 ○
Sulfate ion SO
4
2
- mg/L <200 ○
Acid Consumption
(PH=4.8)
mg(CaCO3)/L <100 ○
Full Hardness mg(CaCO3)/L <200 ○
References
Ferrum Fe mg/L <1.0 ○ ○
Ammonium Ion NH
4
+ mg/L <1.0 ○
Silicon Oxide SiO
2
mg/L <50 ○
Residual Chlorine Cl
2
mg/L <1.0 ○
Dirt, Oil, grease and other impurities will a󰀨ect the heat transfer and unit performance. Foreign substances in the chilled water
will increase the water pressure drop, reduce the water ow, and cause blockage or mechanical damage of the heat exchanger.
Please test water quality strictly according to the water quality requirements to ensure that the water quality entering the water
system meets the requirements in the above table.