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31-5000572 Rev. 1 23
ENGLISH
INSTALLATION INSTRUCTIONS
Additional Refrigerant Charging
• Charge the additional refrigerant as liquid using a digital refrigerant scale and manifold gauges.
• Charge the system in trail mode. Compressor failure can occur if the system runs for a prolonged period of time while
undercharged.
• Charging must be complete within a 30 minute period.
• The unit is only partially charged from the factory and will need additional refrigerant. Refer to the report generated by
the system design software.
– W1: Refrigerant charging volume to outdoor unit at factory.
– W2: Refrigerant charging volume to liquid pipe base on different piping length calculation.
– W2=actual length of liquid pipe×additional amount per ft liquid pipe=
(L1×3.76)+(L2×2.69)+(L3×1.83)+(L4×1.18)+(L5×0.58)+(L6×0.24)
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– L6:Total length of 1/4(6.35) liquid pipe
• Total refrigerant volume charging on site during installation=W2
– W: Total refrigerant volume charging on site for maintenance.
Note:
• Do not use manifold gages and hoses that were used on equipment with oil other than PVE.
Cross contamination can occur.
• Refrigerant R410A is identified by a pink tank color or label.
• Charging cylinders cannot be used as R410A refrigerant will fractionate.
• Always charge R410A refrigerant using liquid. Write the final charge weight on the unit near the name plate
for future reference.
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REFRIGERANT RECORD FORM
Model
W1:
Refrigerant
charging volume
to outdoor unit
at factory
W2:
Refrigerant charging volume to liquid pipe base on different piping
length calculation
Total refrigerant
Volume charging
on site during
installation
W: Total refrigerant volume
charging on Liquid pipe site
for maintenance
Liquid pipe
Diameter in(mm)
Additional refrigerant amount Oz/ft
072 511.5 oz 1/4(6.35) 0.24 Oz/ft×__ft=__ Oz
W2=___ Oz W1+W2=___ Oz
096 754.8 oz 3/8(9.52) 0.58 Oz /ft×__ft=__ Oz
120 754.8 oz 1/2(12.7) 1.18 Oz /ft×__ft=__ Oz
144 698.4 oz 5/8(15.88) 1.83 Oz /ft×__ft=__ Oz
3/4(19.05) 2.69 Oz /ft×__ft=__ Oz
7/8(22.22) 3.76 Oz /ft×__ft=__ Oz
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