Daikin RZQG-LV1L, Installer'S Reference Manual

Page: 9 / 32

5 Preparation
Installer reference guide
9
RZQG7 RZQG71~12 RZQG140L7Y1L
Split system air conditioners
4P473074-1A – 2019.04
Item Description
Flare connections May not be reused. Make new ones to
prevent leaks. See
"6.4.3 Guidelines when
connecting the refrigerant piping" on
page 13
and "6.4.5 To flare the pipe
end" on page 13 .
Welded connections Must be checked for gas leaks.
Cleaning pipes If the following conditions are met, you do
not have to clean the pipes. Otherwise, you
must clean the pipes, or install new ones.
Conditions:
▪ The total one‑way piping length is <50 m
(i.e. L1<50 m).
▪ You pumped down the old system
correctly. This means:
▪ Operated the unit continuously for
30 minutes in cooling mode.
▪ Pumped down the system.
▪ Removed the old units.
▪ Piping is not contaminated (see below).
To check if piping is contaminated
You must check if the existing piping is contaminated. Piping that
contains contaminations such as deteriorated oil will cause
compressor breakdown.
Prerequisite: You need an oil checking reference card. This is
available from your dealer.
1 Put some residual oil from the piping on a piece of white paper.
2 Compare the colours:
If the oil colour is… Then…
Identical to or darker than the
circled colour on the reference
card You must clean the existing
piping, or install new piping.
Lighter than the circled colour
on the reference card You can reuse the piping
without cleaning.
5.3.2 Refrigerant piping requirements
INFORMATION
Also read the precautions and requirements in the
"General safety precautions" chapter.
NOTICE
The piping and other pressure-containing parts shall be
suitable for refrigerant. Use phosphoric acid deoxidised
seamless copper for refrigerant.
▪ Foreign materials inside pipes (including oils for fabrication) must
be ≤30 mg/10 m.
Refrigerant piping material
▪ Piping material: Phosphoric acid deoxidised seamless copper.
▪ Flare connections: Only use annealed material.
▪ Piping temper grade and thickness:
Outer diameter
(Ø)
Temper grade Thickness (t)
(a)
6.4 mm (1/4")
9.5 mm (3/8")
12.7 mm (1/2")
Annealed (O) ≥0.8 mm
t
Ø
15.9 mm (5/8") Annealed (O) ≥1.0 mm
19.1 mm (3/4") Half hard (1/2H)
(a) Depending on the applicable legislation and the unit's
maximum working pressure (see "PS High" on the unit
name plate), larger piping thickness might be required.
Refrigerant piping diameter
The refrigerant piping diameters (for L1) must comply with the
following:
Model New
(a)
/
Existing
(b)
L1 liquid
piping
L1 gas piping
RZQG71 Size‑down Ø6.4 mm Ø12.7 mm
Standard Ø9.5 mm Ø15.9 mm
Size‑up Ø12.7 mm —
RZQG100~140 Size‑down Ø6.4 mm —
Standard Ø9.5 mm Ø15.9 mm
Size‑up Ø12.7 mm Ø19.1 mm
(a) When installing new piping , use the same diameters as
the connections on the outdoor units (i.e. standard
diameters for liquid and gas piping).
(b) When reusing existing piping , you may use the size‑up or
size‑down diameters, but then capacity might decrease,
and stricter piping length requirements are applicable.
Assess these limitations in relation to the complete
installation.
Refrigerant piping length and height difference
The piping length and height difference must comply with the
following requirements:
H1
L1
Requirement RZQG71 RZQG100~140
Total one‑way
piping length Ø size-down 3 m≤L1≤10 m (10 m)
(a)
Ø standard 3 m≤L1≤50 m
(70 m)
(a)
3 m≤L1≤75 m
(90 m)
(a)
Ø size-up 3 m≤L1≤25 m
(35 m)
(a)
3 m≤L1≤35 m
(45 m)
(a)
Height difference between the
indoor unit and the outdoor unit H1≤30 m
(a) When piping length is <5 m, a complete recharge of the
unit is required.
Parenthesised figure represents the equivalent length.
5.3.3 Refrigerant piping insulation
▪ Use polyethylene foam as insulation material:
▪ with a heat transfer rate between 0.041 and 0.052 W/mK (0.035
and 0.045 kcal/mh°C)
▪ with a heat resistance of at least 120°C
▪ Insulation thickness
Ambient
temperature
Humidity Minimum thickness
≤30°C 75% to 80% RH 15 mm
>30°C ≥80% RH 20 mm