Vertiv Liebert AHU - Picv; Smoke Detector; Supply Air Pressure Sensor; Storage & Operating Environment Requirements

Vertiv™ | Liebert® AHU | User Manual 7
1.5.6. PICV
PICV- Pressure Independent Control Valve. The dierence between PICV and EPIV is that it is mechanical rather than
electronic. It is also possible to accurately control the water flow while ensuring a constant flow without being aected by
water pressure fluctuations.
1.5.7. Smoke Detector
Smoke detection system facilitates the data center to detect smoke in the unique air-flow environment. The equipment
room is outfitted with hot and cold aisles, underfloor and overhead spaces, each separated to contain airflow within the
space. The active smoke detection technique triggers an alarm with the first sign of smoke.
1.5.8. Supply Air Pressure Sensor
Supply Air Pressure Sensor is only used for downflow units. It detects the static pressure under the floor of equipment room.
The controller can read the values of static pressure.
1.6. Storage & Operating Environment Requirements
Refer Table 1-3 & Table 1-4 for storage environment and operating environment requirements.
Table 1-3 Storage Environment Requirements
Item Requirement
General requirements Clean room (no dust)
Environment humidity Less than 95% RH (30 °C)
Ambient temperature -25 °C to +55 °C
Storage time Total transportation and storage time should not exceed six months, otherwise the
performance of the system needs to be re-calibrated.
Table 1-4 Operating Environment Requirements
Item Requirement
Ambient temperature Indoor temperature: 18 ºC ~ 40 ºC,
Chilled water pressure: max.16bar.
The inlet water temperature shall not be lower than the return air dew point
The recommended maximum for return air temperature is 105 °F (40 °C) and
maximum dew point is 59 °F (15 °C).
Protection level (cooling unit) IP20
Altitude <1000 m, derating is required when located altitude is above 1000 m
Operation voltage range 380-415 V, 3 Ph + N~50/60 Hz
Note: Contact Vertiv local representative when operating in the following conditions:
1. The voltage of the air conditioning unit is beyond the range of the operating voltage.
2. The altitude is higher than 1000 m.
3. If the operating condition is not as per Table 1-4.