Vertiv | Liebert PEX+ Chilled Water | User Manual 7
Product Overview
1.4.5. Water Flow Regulating Valve
The water flow regulating valve (as shown in Figure 1-6) can regulate the chilled water flow according to the
cooling requirement of the unit by controlling the water flow passing through the cooling coil thus enables the
unit to operate stably within the temperature and humidity setpoint range. User can select two-way or three-way
water flow regulating valve according to dierent applications.
Figure 1-6 Water Flow Regulating Valve
1.4.6. Safety Controlling Device
The electrical reheat is equipped with automatic and manual reset temperature controller which can promptly
disconnect and protect the electrical heater when the temperature of the heater is too high.
The infrared humidifier is equipped with manual reset dry burning prevention temperature controller, manual
reset safe switch and high water level alarm switch. When there is dry burning and the temperature is too high,
the power of the humidifier can be automatically disconnected to protect the humidifier from the damage.
1.4.7. Cooling Coil
Liebert PEX+ CW series is equipped with a fin-tube copper cooling coil which provides high eiciency, high
Sensible Heat Ratio (SHR), and low air-side pressure drop. The coil is a construction of enhanced surface
aluminum fins mechanically bonded to the surface of copper tubes; the coil frame is fabricated from hot dipped
galvanized sheet metal. The water circuits are specifically designed for even water distribution to improve heat
transfer rate whilst maintaining pressure drop. The coil fins have a hydrophilic coating as standard and the
condensate pan is made from stainless steel.
1.4.8. Filter
The unit uses a standard filter that complies with US ASHRAE52-76 and Eurovent 4/5 standards, and the dust
resistance value is 90% (EU4 standard). It is easy to replace. To ensure eicient operation, the dust filter must be
checked once a month, and be replaced as required.
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