Commissioning Overview
Vertiv | Liebert CRD10 | User Manual 64
5.2 Preparations for Start-up
This section explains in brief the basics of the commissioning process to help users understand checks before
start-up.
5.2.1
Inspection of Pipes
•
Installing the connection pipes
1. Check if the equivalent length of the single-way pipe of the air cooled unit exceeds 30m(98.4ft.).
2. Check whether the solenoid valve kit and oil trap are installed.
3. Confirm if the corresponding refrigerant oil needs to be re-filled.
4. Check if the rated voltage of the solenoid valve on the liquid pipe meets the requirements.
5. Check the relative positions between the indoor and the outdoor unit. If the condenser is higher than the
indoor unit, the liquid pipe should be at a greater height than the “U” bend of the condenser coil.
•
Vacuuming
1. Open all the ball valves, electronic expansion valve (EEV) and solenoid valve of the system (Enter vacuum
mode).
2. Connect the compound pressure gauge to the corresponding high and low pressure schrader valves.
Vacuum from both the high and low pressure locations (shown in Figure 5-1) as indicated by the labels.
Requirements:
> Pull an initial deep vacuum of 500 microns on the system with a suitable pump.
> After 4 hours, check the pressure readings and, if they have not changed, break vacuum with dry
nitrogen. Pull a second and third vacuum to 500 microns or less. Re-check the pressure after 2 hours.
> When the 3 checks are complete, proceed to charging.
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