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10.3.7. OXYGEN TUBE CONNECTION
Precautions during oxygen tube connection
1. Tube allowable length and height difference is the same as
1. Tube allowable length and height difference is the same as
pipes.
2. Tube should be pulled without folding it along the path of
refrigerant pipe, providing sufficient allowance and cut to
length.
•
length.
•
•
•
• If there is no allowance, tube length will contract when
temperature changes and it may cause trouble.
•
•
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• On the other hand, tube length used without cutting and
in the form of loop too should be avoided.
3. When the tube is passed throught the pipe hole, it should
not form the inner wall of the pipe bends.
The tube may be pressed to the corner of the hold and
crushed.
The tube may be pressed to the corner of the hold and
crushed.
4. Cutting of tube should be done with cutter or knife, cutting
suface should be straight and even.
Finishing should be done and leave no scratches behind.
Finishing should be done and leave no scratches behind.
5. Tube end’s last 15 mm (the section to be inserted to the
joint during connection) should be free from any damages.
6. Take note that the inside of tube should be free from
stones, dirt, dust, and other impurities.
1. Oxygen tube connection
•
•
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• Insert oxygen tube
into the joint section of indoor unit till
it fully reaches its limit (about 15 mm).
•
•
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• If the insert does not fully reach the limit, oxygen may leak
out from the joint causing abnormal noise.
•
•
•
• In both indoor and outdoor unit, the tube inserted will be
locked inside the joint by the stopper, and the job is
complete. To make sure that it’s done properly, pull out
lightly to check if can be removed.
lightly to check if can be removed.
2. Connection check
•
•
•
• Do connection check after normal running of
cooling/heating has been confirmed during trial
operation.
(You cannot do proper oxygen tube connection check
before normal running has been confirmed during trial
operation).
operation.
(You cannot do proper oxygen tube connection check
before normal running has been confirmed during trial
operation).
•
•
•
• Operate according to the sequence listed below, and check
tube connection.
1. Open the cap (1) to check.
2. Put your ear close to the window to listen if there is
1. Open the cap (1) to check.
2. Put your ear close to the window to listen if there is
oxygen flowing out (a shuuuu sound).
If it’s hard to hear, push the cap (2) in the window with
your finger, then release your finger. The sound of flow
will be louder and easier to hear.
(If there is no air release, the cause may be tube
collapse, or the insert at join section not proper. Check
again and make correction if found not properly done.)
If it’s hard to hear, push the cap (2) in the window with
your finger, then release your finger. The sound of flow
will be louder and easier to hear.
(If there is no air release, the cause may be tube
collapse, or the insert at join section not proper. Check
again and make correction if found not properly done.)
3. After checking, make sure that you push down the
cap (1) and return to its original position.
(If it is not returned to its position, it may cause
abnormal noise.)
(If it is not returned to its position, it may cause
abnormal noise.)
3. Finishing
•
•
•
• Finishing should be carried out for pipe and drain hose.
•
•
•
• Refer to 10.3.6 Pipe insulation of outdoor unit.
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