Copyright © Fujitsu General America, Inc.
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Leak Test
Evacuate
& Charge
Refrigerant Charge
YOU
MUST!
YOU
MUST!
Never apply power to a Fujitsu HFI system
until leak testing, repair, evacuation & the
refrigerant has been added to the system!
IMPORTANT NOTE:
R410a must be added to ALL Halcyon HFI Systems!
Charge is based on length of the liquid/small line side of the system’s pipes
- Total length in feet of liquid ⅜ (small) pipes from outdoor unit to Branch Boxes
- Total length of feet of liquid ¼ pipes from Branch Boxes to all indoor units
- Then add charge based on table below.
Calculate the refrigerant charge as follow:
• Multiply ⅜ calculated pipe length from outdoor unit
to branch boxes by .624 oz per ft.
• Multiply calculated ¼ pipe length Branch Boxes to
all Indoor Units by .224 oz per foot
Example: 78 ft calculated ⅜ pipe & 110 feet of calculated ¼ pipe
• ⅜@78ft X .624oz = 48.672oz divide oz by 16 to get 3.042lbs
• ¼@110ft X .224 oz = 24.64 oz = divide by 16 to get 1.54lbs
• Now Add ⅜ @ 48.672oz + ¼@ 24.64oz = 73.31oz – 4.58 lbs of R410a
Pipe Diameter Location Additional Refrig.
3/8” Outdoor to Branch Box 0.624 oz./ft. or 58g/meter
1/4” Branch Box to Indoor Unit 0.224 oz./ft. or 21g/meter
(Total length of 3/8” liquid line × 0.624 oz./ft. or 58g/meter ) + (Total length of 1/4” liquid line × 0.224 oz./ft. or 21g/meter )
(a+b+c+d+e) × 0.624 oz./ft. or 58g/meter + (f+g+h+i+j+k+l+m) × 0.224 oz./ft. or 21g/meter = additional refrigerant
Never apply power to a Fujitsu
HFI system until leak testing and
evacuation and system
refrigerant has been added!
• After completing nitrogen purge and
leak test slowly remove nitrogen
from the system
• Connect vacuum pump and
micron gauge
• Using industry standard “Best Practices”
evacuate system to 500 microns and
make sure it holds for 60 minutes.
• While evacuating calculate system charge
requirements.
• After connecting all refrigerant pipes connect
gauge hose and a regulated nitrogen tank to one connection of the
outdoor unit’s port and purge entire system with nitrogen through
the indoor units and back out the other port.
• Pressurize the entire piping system with nitrogen to 600PSI and
leak test every fitting carefully with soap bubbles!
• Perform a 24 hour standing pressure test with nitrogen to assure a
leak free system
• Keep service valves on the outdoor unit closed until system is
evacuated and refrigerant is added.
• It is highly recommended that you replace the oil in the vacuum
pump before it is used.
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