Indoor/Outdoor Units Connection Finishing And; Test Run - Mitsubishi Electric MXZ-3A30NA Installation Manual

5. INDOOR/OUTDOOR UNITS CONNECTION FINISHING AND

TEST RUN

5-1 TOOLS DEDICATED FOR THE AIR CONDITIONER WITH R410A RE-
FRIGERANT
The following tools are required for R410A refrigerant. Some R22 tools can be substituted for R410A tools.
R410A tools Can R22 tools be used?
Gauge manifold
Charge hose
Gas leak detector
Torque wrench
Flare tool
Flare gauge
Vacuum pump
adaptor
Electronic scale for
refrigerant charging
No: Not substitutable for R410A Yes: Substitutable for R410A
5-2 FLARED CONNECTIONS
PIPE LENGTH AND HEIGHT DIFFERENCE
Pipe length per indoor unit
Total pipe length for multi-system
Height difference
No. of bends per indoor unit
Total No. of bends for multi-system
Refrigerant adjustment ....... If pipe length exceeds 40 m (131 ft.), additional refrigerant (R410A) charge is re-
(The outdoor unit is charged with refrigerant for total pipe length up to 40 m (131 ft.).)
Pipe length
Refrigerant to be added
Indoor unit
Indoor unit
Indoor unit
• For pipe size, see the table below.
No R410A has high pressures beyond the measurement range of existing gauges.
Hose material and cap size have been changed to improve the pressure resist-
No
ance.
No Dedicated for HFC refrigerant.
Yes 1/4 and 3/8
No 1/2 and 5/8
Yes Clamp bar hole has been enlarged to reinforce the spring strength in the tool.
New Provided for flaring work (to be used with R22 flare tool).
Provided to prevent the back flow of oil. This adapter enables you to use exist-
New
ing vacuum pumps.
It is difficult to measure R410A with a charging cylinder because the refrigerant
New
bubbles due to high pressure and high-speed vaporization.
Limits
25 m (82 ft.)
70 m (230 ft.) max.
10 m (33 ft.)
25
70
quired.
Up to 40 m (131 ft.)
Exceeding 40 m (131 ft.)
1.06 oz each 5 ft.
max.
max.
max.
max.
No additional charge is required.
Additional charge is required.
(Refer to the table below.)
Ç UNIT
Outdoor
ı UNIT
unit
Å UNIT
Description