Daikin VRV III Series - Page 12

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3. Connecting refrigerant piping to outdoor units
<In case of single system>
• Heat Pump series (RQYQ) (Refer to figure 15.1)
1. When connected to the front side
2. When connected to the lateral side (bottom)
3. Remove the shutoff valve cover to connect
4. Remove the knock hole on the bottom frame and route
the piping under the bottom frame
5. Liquid side shutoff vale
6. Gas side shutoff valve
7. Liquid side accessory pipe (1)
8. Liquid side accessory pipe (2)
9. Gas side accessory pipe (1)
10. Gas side accessory pipe (2)
11. L type accessory joint
12. Brazing
13. Piping is not used
• Heat Recovery series (RQEQ) (Refer to figure 15.2)
1. When connected to the front side
2. When connected to the lateral side (bottom)
3. Remove the shutoff valve cover to connect
4. Remove the knock hole on the bottom frame and route
the piping under the bottom frame
5. Liquid side shutoff vale
6. Suction gas side shutoff valve
7. HP/LP gas side shutoff valve
8. Liquid side accessory pipe (1)
9. Liquid side accessory pipe (2)
10. Suction gas side accessory pipe (1)
11. Suction gas side accessory pipe (2)
12. HP/LP gas side accessory pipe (1)
13. HP/LP gas side accessory pipe (2)
14. L type accessory joint
15. Brazing
Note
<Connecting Refrigerant Piping>
• W
hen connecting the piping on site, be sure to use the accessory
piping.
• Make sure the onsite piping does not come into contact with other
piping or the bottom frame or side panels of the unit.
<Multi Systems>
• RQEQ series cannot be used as an independent unit in a multi
system.
• The Outdoor unit multi connection piping kit (sold separately) is
needed when connecting piping between outdoor units.
Refer to the installation manual that comes with the kit when
doing this piping work.
4. Precautions when connecting piping between outdoor units (In
case of multi system)
The Outdoor unit multi connection piping kit (sold separately) is
needed to connect piping between outdoor units in multi system.
Only proceed with piping work after considering the limitations on
installation listed here and in “5. Branching the refrigerant piping”,
always referring to the kit’s installation manual.
(1) The piping between outdoor units must be installed level
(Pattern 1) or with a rise (Pattern 2). Otherwise, oil may pool
in the pipes.
: Possible, ×: Impossible
Pattern 1
Pattern 2
Prohibited pattern
to indoor 
unit
to indoor 
unit
Piping between outdoor units
Piping between outdoor units
Front connections
Side (bottom) connections
Level
Front connections
Side (bottom) connections
Rise
Rise
Rise
Change to pattern 1 or pattern 2
Downward 
inclination
Downward inclination
Oil remains in piping
Front connections
Side (bottom) connections
Downward inclination
The explanation
is belows in
case of three
multi outdoor
units.
to indoor 
unit
to indoor 
unit
to indoor 
unit
to indoor 
unit
01_EN_3P226891_9.fm Page 7 Tuesday, December 1, 2009 4:38 PM