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Refrigerant Charging Procedure
Please refer to your units installation manual for proper charge. If your lineset exceeds the chart below for your
model, additional charge may be required. e charge must we weighed in with a refrigerant charging scale.
You c
an only add additional refrigerant to a new installation. If a low or high charge is suspected, you must
reclaim the refrigerant, then weigh in the correct amount per specications including any additional for long
linesets. It is important to check for leaks before adding refrigerant.
1. Determine additional refrigerant charge.
The +MULTI multi zone units contain a factory charge adequate for up to a total length of refrigerant line as
indicated in the chart below. Additional refrigerant will need to be added for total lengths over the listed
length.
Conrm the following chart with your installation manual for additional charge amounts:
MULTI18
HP230V1AO
MULTI24
HP230V1AO
MULTI30
HP230V1AO
MULTI36
HP230V1AO
MULTI42
HP230V1AO
Additional Charge 0.2 oz./. 0.2 oz./. 0.2 oz./. 0.2 oz./. 0.2 oz./.
Max Length without
Additional Charge
33 98 131 131 164
Factory Charge
48 oz. 78 oz. 78 oz. 102 oz. 169 oz.
Indoor Unit 1
Indoor Unit 3
Indoor Unit 2
Indoor Unit 4
MULTI36HP230V1AO
Example:
Model MULTI36HP230V1AO
70
. + 60 . + 40 . + 50 . = 220 . Total Line Length
220 . - 131 . = 89 . Additional Line Length
89 . x 0.2 oz = 17.8 ounces of additional charge
Record the amount of additional charge for future reference.
70’
60’
40’
50’
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