Daikin VRV Series - Setting the Master User Interface

11
3P184443-12N English
6. REFRIGERANT PIPING WORK
<For refrigerant piping of outdoor units, see the installation manual attached to the outdoor unit.>
<Execute thermal insulation work completely on both sides of the gas piping and the liquid
piping. Otherwise, a water leakage can result sometimes.>
Be sure to use insulation designed for use with HVAC systems.
<Also, in cases where the temperature and humidity of the refrigerant piping sections might
exceed86°ForRH80%,reinforcetherefrigerantinsulation(13/16in.orthicker).Condensation
may form on the surface of the insulating material.>
<Before refrigerant piping work, check which type of refrigerant is used. Proper operation is not
possible if the types of refrigerant are not the same.>
CAUTION
• Useapipecutterandaresuitableforthetypeofrefrigerant.
• Applyesteroiloretheroilonlyinsideoftheareportionsbeforeconnecting.
• Topreventdust,moistureorotherforeignmatterfrominltratingthetube,eitherpinchtheend
or cover it with tape.
• Do not allow anything other than the designated refrigerant to get mixed into the refrigerant
circuit, such as air. If any refrigerant gas leaks while working on the unit, thoroughly ventilate
the room immediately.
• Donotmixairorothergaswiththespeciedrefrigerantinthe
refrigeration circuit.
• Ventilate the room if refrigerant gas leaks during the work.
• The outdoor unit is charged with refrigerant.
• Be sure to use both a spanner and torque wrench together, as
shown in the drawing, when connecting or disconnecting pipes to/
from the unit. (Refer to Fig. 13)
• Refer to Table 3 for the dimensions of are nut spaces.
• When connecting the are nut, coat the are section (only inside)
with ester oil or ether oil, rotate three or four times rst, then screw
in. (RefertoFig.14)
• Keep all the screw mounting resin parts (e.g., piping presser
plates) away from oil.
If oil adheres, the strength of the screw mounting resin parts may
drop.
CAUTION
Over-tightening may damage the are and cause a refrigerant
leakage.
Torque wrench
Spanner
Piping union
Flare nut
Fig. 13
Apply ester oil or
ether oil only inside
Fig.14
NOTE
• Use the are nut included with the unit main body.
Table 3
Pipe size Tightening torque Flare dimensions A (in.) Flare
ø1/4” 10.4 - 12.7 ft-lbf 0.342 - 0.358
R0.016 - 0.031
ø1/2” 36.5 - 44.5 ft-lbf 0.638 - 0.654
• Refer to Table 3 to determine the proper tightening torque.