Trane Flex II Series Installation Operation & Maintenance page 13

∆Tmax chiller = 8 °C
dpw = K·Q² / 1000 Q = 0,86 P/∆T
Important: If pumps driven by inverters (either unit onboard pump or external pump) in every working condition, the variation of the
water flow rate must be as low as possible and less than 10% of the nominal flow rate per minute.
7.2 WATER CIRCUIT REGULATION EQUIPMENT
Centrifugal motor pump block
Assures the discharge and the prevalence necessary to supply tube nest evaporator, the tank and the utility.
Automatic filling unit
Assures the water pressure in the plant is maintained at least 1.5 bar, automatically resetting it when necessary.
Safety valve
Takes care of opening the plant in atmosphere if the pressure exceeds the value of 6 bar.
Expansion tank
Takes care of compensating small water hammering and variations of volume for different temperatures.
Check valves
Take care of intercepting the pump for possible maintenance.
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