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10. Compressor
W-2WAY ECO-i SYSTEM
Outdoor Unit Repair Procedures
(16) After evacuating all nitrogen gas from the tubing, apply vacuum to all outdoor units where dry cores were
removed until the pressure is –14.7 psig (5 Torr) or less.
(17) INSTALLATION: Refer to the “Information for the Person in Charge of Installation” items. Charge with an
amount of refrigerant equal to the amount that was recovered.
(B) If a ball valve is not installed on the outdoor unit
(1) Refer to “5-2-3. Refrigerant recovery procedures (2) : Indoor unit with no ball valve equipped.” Perform
pump down of the refrigerant from all indoor units and inter-unit tubing to the outdoor unit side.
(2) Cut the liquid (narrow) tube at all outdoor units where dry cores will be attached, then attach the dry cores
and ball valves as shown in Fig. 21.
(3)
Fig. 21
Balance tube
Normal unit
Liquid tube service valve
Outdoor unit
Cleaning dry core
Dry core (bidirectional:
for R410A refrigerant
)
Ball valve
Liquid tube
Gas tube
For the next steps, refer to (6) – (17) in (A) on the previous page.
(14) Perform steps (1) – (4), and remove all dry cores. Then connect the tubing between the liquid (narrow) tube
valves and the ball valves.
(15) At all outdoor units where dry cores were removed, pressurize with 478.6 psi of nitrogen from the liquid tube
service port and check for leaks.