142 RTHD-SVX01D-EN
Maintenance Procedures
2. Connect the vacuum pump to the 5/8” flare connection on the bottom of
the evaporator and/or condenser.
3. To remove all of the moisture from the system and to insure a leak free
unit, pull the system down below 500 microns.
4. After the unit is evacuated, perform a standing rise test for at least an
hour. The pressure should not rise more than 150 microns. If the pres-
sures rises more than 150 microns, either a leak is present or moisture is
still in the system.
NOTE: If oil is in the system, this test is more difficult. The oil is aromatic
and will give off vapors that will raise the pressure of the system.
Refrigerant Charging
Once the system is deemed leak and moisture free, use the 5/8” flare con-
nections at the bottom of the evaporator and condenser to add refrigerant
charge.
Refer to Table 4 - Table 6 and Unit nameplate for Refrigerant charge informa-
tion.
Freeze Protection
For unit operation in a low temperature environment, adequate protection
measures must be taken against freezing. Adjusted settings and recom-
mended ethylene glycol solution strengths are contained in Table 32 as fol-
lows:
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