Note On Adding Refrigerant - Rinnai P Series Installation Manual

Note on Adding Refrigerant

Note on Adding Refrigerant
Some systems require additional charging depending on pipe lengths. The standard pipe length varies
Some systems require additional charging depending on pipe lengths. The standard pipe length varies
according to local regulations.
according to local regulations. For example, in North America, the standard pipe length is 7.5m (25').
In other areas, the standard pipe length is 5m (16'). The refrigerant should be charged from the service In other areas, the standard pipe length is 5m (16'). The refrigerant should be charged from the service
port on the outdoor unit's low pressure valve. The additional refrigerant to be charged can be calculated
port on the outdoor unit's low pressure valve. The additional refrigerant to be charged can be
using the following formula:
calculated using the following formula:
Connective Pipe Air Purging
Length (m)
< Standard pipe length Vacuum Pump
> Standard pipe Vacuum Pump
length
For R290 refrigerant unit, the total amount of refrigerant to be charged is no more than:
387g(<=9000Btu/h), 447g(>9000Btu/h and <=12000Btu/h), 547g(>12000Btu/h and <=18000Btu/h),
632g(>18000Btu/h and <=24000Btu/h).
CAUTION
DO NOT
Rinnai
ADDITIONAL REFRIGERANT PER PIPE LENGTH
Method
Liquid Side: Ø 6.35 (ø 0.25")
(Pipe length – standard length) x 12g/m
(Pipe length – standard length) x 0.13oZ/ft
(Pipe length – standard length) x 10g/m
(Pipe length – standard length) x 0.10oZ/ft
(Pipe length – standard length) x 15g/m
(Pipe length – standard length) x 0.16oZ/ft
(Pipe length – standard length) x 20g/m
(Pipe length – standard length) x 0.21oZ/ft
mix refrigerant types.
Additional Refrigerant
N/A
R32:
R290:
R410A:
R22:
(Pipe length – standard length) x 0.42oZ/ft
27
AIR EVACUATION
Liquid Side: Ø 9.52 (ø 0.375")
R32:
(Pipe length – standard length) x 24g/m
(Pipe length – standard length) x 0.26oZ/ft
R290:
(Pipe length – standard length) x 18g/m
(Pipe length – standard length) x 0.19oZ/ft
R410A:
(Pipe length – standard length) x 30g/m
(Pipe length – standard length) x 0.32oZ/ft
R22:
(Pipe length – standard length) x 40g/m
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Split AC IM
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