Vertiv | Liebert® CRV4 | User Manual 49
Start-up Commissioning
4. Charging refrigerant
• Static charging (before turning on the unit):
After vacuum inspection, immediately charged the cooling system with proper amount of liquid refrigerant
(generally charge until the pressure in the tank is balanced with the system pressure).
Connect the high/low pressure meter to the refrigerant cylinder, and the connection soft pipe of the pressure
meter should be vacuumed.
Connect the high/low pressure meter to the interfaces of the schrader valve near the liquid ball valve and
electronic expansive valve, keep the refrigerant cylinder up-side-down during static charging process.
• Do not turn-On the unit immediately after static charging:
Prior to turning On the unit, ensure to warm-up the crank box of the compressor for more than 12hours, if the
warming-up time is insuicient, use a drier or other safe heating source to heat the bottom of the compressor
shell for about 30min so as to evaporate any liquid refrigerant.
For CR035 model, it is prohibited to charge the refrigerant from the schrader valve of air suction pipe of
the compressor, otherwise, any damage caused by following wrong operation procedure, Vertiv does not
assume warranty responsibility.
• Vacuum the soft connection pipe of the pressure meter.
• After charging the refrigerant, do not turn-On the unit immediately to avoid any damage to the
compressor with liquid.
• For healthy work environment, wear ear mask or ear plug to protect your hearing after entering the
equipment room.
• Dynamic charging:
Put the refrigerant cylinder upside down, manually start the compressor ( Fan output 60% and compressor
output 72%) to perform dynamic charging.
After the compressor starts, dynamically charge the refrigerant (R410A) until there is no bubble in the sight
glass and the condensation super cooling reaches more than 3 K and air suction superheat reaches more than
7 K.
Observe the compressor air suction pipes, ensure the pipe and compressor shell have no condensation to
exclude potential liquid strike risks and the unit air exhaust superheat should be within the range of
25 °C to 50 °C.
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