Daikin RXYTQ46TYF [6/36] Preparation
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Daikin RXYTQ46TYF [6/36] Preparation

Daikin RXYTQ16T7YF [6/36] Preparation
4 Preparation
Installation and operation manual
6
RXYTQ8~16T7YF
VRV IV system air conditioner
4P388987-1C – 2016.02
Pipe Ø (mm) Minimal thickness t (mm)
15.9 0.99
19.1/22.2 0.80
28.6 0.99
34.9 1.21
41.3 1.43
▪ In case the required pipe sizes (inch sizes) are not available, it is
also allowed to use other diameters (mm sizes), taken the
following into account:
▪ Select the pipe size nearest to the required size.
▪ Use the suitable adapters for the change-over from inch tomm
pipes (field supply).
▪ The additional refrigerant calculation has to be adjusted as
mentioned in "5.6.3 To determine the additional refrigerant
amount"on page13.
4.2.3 To select refrigerant branch kits
Refrigerant refnets
For piping example, refer to "4.2.2 To select the piping size" on
page5.
▪ When using refnet joints at the first branch counted from the
outdoor unit side, choose from the following table in accordance
with the capacity of the outdoor unit (example: refnet joint a).
Outdoor unit capacity type
(HP)
2 pipes
8~10 KHRQ22M29T9
12~22 KHRQ22M64T
24~48 KHRQ22M75T
▪ For refnet joints other than the first branch (example refnet joint b),
select the proper branch kit model based on the total capacity
index of all indoor units connected after the refrigerant branch.
Indoor unit capacity index 2 pipes
<200 KHRQ22M20T
200≤x<290 KHRQ22M29T9
290≤x<640 KHRQ22M64T
≥640 KHRQ22M75T
▪ Concerning refnet headers, choose from the following table in
accordance with the total capacity of all the indoor units connected
below the refnet header.
Indoor unit capacity index 2 pipes
<200 KHRQ22M29H
200≤x<290
290≤x<640 KHRQ22M64H
(a)
≥640 KHRQ22M75H
(a) If the pipe size above the refnet header is Ø34.9 or more,
KHRQ22M75H is required.
INFORMATION
Maximum 8 branches can be connected to a header.
▪ How to choose an outdoor multi connection piping kit. Choose
from the following table in accordance with the number of outdoor
units.
Number of outdoor units Branch kit name
2 BHFQ22P1007
3 BHFQ22P1517
INFORMATION
Reducers or T-joints are field supplied.
NOTICE
Refrigerant branch kits can only be used with R410A.
4.2.4 Multiple outdoor units: Possible layouts
▪ The piping between the outdoor units must be routed level or
slightly upward to avoid the risk of oil retention into the piping.
Pattern 1 Pattern 2
a
b
b
a
b
a
a
b
a
b
b
a
a To indoor unit
b Piping between outdoor units
X Not allowed
O Allowed
▪ To avoid the risk of oil retention to the outmost outdoor unit,
always connect the stop valve and the piping between outdoor
units as shown in the 4 correct possibilities of the figure below.
a
b b b
a
b b b
a
b
a
b
a
b
a
a
a
≥200 mm
a To indoor unit
b Oil collects to the outmost outdoor unit when the system
stops
X Not allowed
O Allowed
▪ If the piping length between the outdoor units exceeds 2m, create
a rise of 200 mm or more in the gas line within a length of 2m
from the kit.

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