Daikin VRV II Series, Design, Installation & Testing Instructions, Page: 21 / 242

Si39-303 Installation
General Information 15
3.2 Work Involved in Individual Operations and Points to be
Borne in Mind
3.2.1 Sleeve and Insert Work
!
Operational steps
Positioning of the
Pipe Holes
a) The through holes for the drain piping should be positioned such that the pipes have a downward
gradient. (The gradient must be at least 1/100. The thickness of the insulating materials must also be
taken into consideration.)
b) The diameter of the through holes for the refrigerant piping should include an allowance for the
thickness of the heat insulation materials. (It is a good idea to think of the liquid and gas pipes as pairs.)
c) Attention should be paid to the construction of the beam themselves since there are sometimes parts of
the beam which cannot be used to accommodate through holes.
Example: Through holes in a reinforced concrete beam
Positioning the
Insert
a) An insert is a metal tool which is inserted into a floor or a beam before the concrete is set such that
fittings such as ducts, pipes or suspension bolts for hanging units can be fitted into place later. The
positions of the inserts must be decided early.
Example: Steel insert
Important point:
1. The weight of the fitting to be suspended must be taken into account when choosing the insert.
Preliminary talks
with
construction
company Determine
position, size and
number of units
required
Carry out work Check work
(V0957)