Item
Description
Item
Description
8
Compressor
18
Electronic expansion valve
9
Suction pipe
19
Schrader valve
10
Low pressure sensor
20
Evaporator coil
7.1.3 Adding Lubricating Oil
NOTE: The unit has been charged with certain amount of lubricating oil in the factory. If the liquid pipe between the
evaporator and condenser is shorter than 30 m (98.4 ft) and the unit is not equipped with a low ambient kit, you do
not need to add extra lubricating oil. If the unit is equipped with a low ambient kit or if the liquid pipe between the
evaporator and condenser is longer than 30 m (98.4 ft), you need to add extra lubricating oil. The lubricating oil for
the unit is POE (32-3MAF).
NOTE: Do not use refrigerant and lubricating oil of poor quality or wrong type, as they can damage the system.
After evacuating the unit, connect the lubricating oil tank to the Schrader valve 3, as shown in
on the previous page . The oil is drawn into the unit.
7.1.4 Charging the Refrigerant
NOTE: The unit is not charged with refrigerant from factory. You need to charge refrigerant on site. The refrigerant
for the unit is R410A.
Charging refrigerant statically
Connect a manifold gauge to the refrigerant cylinder. Purge the air out of hoses. Connect the manifold gauge to the
Schrader valves 3 and 11, as shown in
on the previous page . Charge the refrigerant and keep
the refrigerant cylinder inverted to ensure liquid refrigerant is being drawn into the unit.
NOTE: Do not over charge the unit. Charge the unit dynamically only if the unit is not charged with enough
refrigerant.
NOTE: After charging the refrigerants statically, do not turn on the compressor to charge the refrigerant dynamically
until the compressor has been pre-heated for more than 12 hours.
NOTE: Before charging the refrigerant dynamically, switch on the circuit breaker of the indoor fans and the
compressor.
Charging refrigerant dynamically
On the HMI display, press and hold the ON/OFF button for three seconds to start the unit. Choose Maintenance > Manual
Mode, and select Yes for Enable Manual Mode. Set the output value to 75% for the fan, start the compressor after 5 minutes,
and adjust the compressor output to 72%. Connect the refrigerant cylinder to the Schrader valve 11, as shown in
on the previous page , and keep the refrigerant cylinder inverted. After the compressor starts to
operate, the refrigerant will be drawn into the unit.
NOTE: Do not charge the unit too fast. Otherwise the compressor can be damaged.
NOTE: After charging the refrigerant dynamically, if the unit needs to be powered off, press and hold the ON/OFF
button on the HMI display to power it off. Do not power off the unit by turning off the circuit breakers, as this may
damage the compressor.
7 Start-up
53
Vertiv™ Liebert® CRV CRD25 and CRD35 Row-Based Cooling System User Manual
