Emerson VERTIV Liebert Mini-Mate2 Series User Manual page 98

Filter Drier Selection and Installation
Recommended
1. Install a replaceable-core filter drier approved for POE oil. The existing drier must be removed.
The replaceable core drier will not fit in the same location as the existing drier.
2. Ensure there is enough clearance for replacing cores when choosing a location.
3. Replace core a week after startup and inspect the removed replaceable core for contaminants
to determine if another replacement is needed. (If the system experienced a burnout, shorter
interval replacements will be needed.)
Optional
Install a new filter drier approved for POE oil in place of the existing one.
Install the New Condensing Unit
1. Install a stub tube kit on the existing line set connecting to the new condensing unit. This kit is
available from Vertiv or your local Vertiv representative.
2. Evacuate the evaporator-piping system twice to a minimum 500 microns, breaking the vacuum
with dry nitrogen each time.
3. Evacuate a third time to 500 microns and verify the above levels are maintained for at least one
minute after the unit is isolated from the vacuum pump by a shutoff valve.
4. Connect the condensing unit with the evaporator and piping (see
on page 19).
5. Add enough R-407C refrigerant for the evaporator unit and line set. See Table 2.11 on the
previous page for line set charges required and Table 2.12 on the next page for standard
evaporator units. If a non-standard evaporator was used, refer to evaporator unit serial tag for
charge amounts and use 1 oz. (0.0283kg) R-407C for every 1 oz. (0.0283kg) R-22 used in old
evaporator and piping.
2.5.6 General System Charge Requirements
Liebert® split system units are designed with quick-connect fittings and are factory-charged to proper
levels. Due to the wide range of operating ambients and sensitivity of the system components to charge
level, the system charge must be maintained at recommended levels.
NOTE: If there is any doubt that the system has the correct refrigerant charge level, the correct
procedure is to remove the entire system charge, evacuate the system and weigh in the recommended
factory charge total for both units and any line sets or field piping.
Table 2.7 on page 17, Table 2.8 on page 18, Table 2.11 on the previous page and the following table are
included for field piping allowances, condensing unit charges, line sets and evaporator charges.
Total refrigerant charge = evaporator + lines + condensing unit
NOTE: All condensing units and most evaporator units are fully charged with refrigerant. Some
evaporator units are shipped from the factory with a nitrogen holding charge only. (Refer to evaporator
serial tags.) If field-supplied refrigerant piping is installed, refrigerant must be added to the system.
Refer to Figure 2.12 on page 16 for field-supplied piping guidelines.
Vertiv | Liebert PFH Installer/User Guide |
Installation of Piping to Units
21