Carrier 69NT40-511-1 Operating And Service Manual page 100

b. For Units equipped with receiver: partially block
the condenser coil inlet air, starting from the front of
the condenser coil. Increase the area blocked until
the compressor discharge pressure is raised to
approximately 12 kg/cm@ (175 psig). Refrigerant
level on the receiver will normally be between the
sight glasses. If the refrigerant level is not between
these boundaries, refer to section 6.6.3.
c. For Units equipped with water-cooled condenser:
T-268-07
check charge only on air-cooled operation.
Refrigerant level in the water-cooled operation will
be normally above sight glass. Partially block the
condenser coil inlet air starting from the front of the
condenser coil. Increase the area blocked until the
compressor discharge pressure is raised to
approximately 12 kg/cm@ (175 psig). Refrigerant
should appear at center line of sight glass on the
water-cooled condenser. If the refrigerant level is
not between these boundaries, refer to section 6.6.3.
6-6