Carrier NDK33BN0KB, Operation & Service Manual

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62-61753-21 1-6
1.4 SPECIFIC R-452A REFRIGERANT WARNING
AND CAUTION
WARNING
R-452A is an A1 non-flammable refrigerant
blend; however certain of its constituents
are considered A2L midly flammable.
For this raison, it is imperative that the sys-
tem of a vector unit utilizing R-452A refrig-
erant be reclaim to a sufficient vaccum to
ensure all residual refrigerant is removed
from the system
Follow the R-452A refrigerant reclaim / re-
covery procedure before performing any
“Hot work” including but not limited to
brazing or welding on a unit that has been
charged with R-452A, to prevent flare up of
residual A2L refrigerant constituents
Refrigerant must be reclaimed until equip-
ment gauge indicates 20 inHG (-0.6bar) of
vacuum.
Refer to Section 8.5.2Removing The R-
452A Refrigerant Charge
Refer to the Service Bulletin SB06-16 for
additional information
CAUTION
As distinct of R404A refrigerant, R-452A
has slidding properties more important and
not negligeable between vapour state and
liquid state.
For a given temperature, the liquid state
pressure value and the vapour state pres-
sure value, of the R-452A refrigerant are
differents.
Refer to section 10 for Temperature pres-
sure chart