Precautions On Refrigerant Piping - Daikin ERLQ036BAVJU Installation Manual

Selection of piping material
Construction material: phosphoric acid deoxidised seamless
copper for refrigerant.
Temper grade: use piping with temper grade in function of the
pipe diameter as listed in table below.
The pipe thickness of the refrigerant piping should comply with
relevant local laws and regulations. The minimal pipe thickness
for R410A piping must be in accordance with the table below.
Temper grade
Pipe Ø of piping material
3/8 inch (9.5 mm)
5/8 inch (15.9 mm)
O=Annealed
Refrigerant pipe size
The pipes between outdoor unit and indoor unit should have the
same size as the outdoor connections.
Gas pipe
Liquid pipe
Allowable pipe length and height difference
See the table below concerning lengths and heights. Refer to
figure 2. Assume that the longest line in the figure corresponds with
the actual longest pipe, and the highest unit in the figure corresponds
with the actual highest unit.
Allowable pipe length
Allowable pipe length
Maximum total one-way piping length
L
Maximum height between indoor and outdoor
H
Chargeless length
L
(a) Parenthesized figure represents the equivalent length.
P
RECAUTIONS ON REFRIGERANT PIPING
Do not allow anything other than the designated refrigerant to
get mixed into the freezing cycle, such as air, etc. If any
refrigerant gas leaks while working on the unit, ventilate the
room thoroughly right away.
Use R410A only when adding refrigerant
Installation tools:
Make sure to use installation tools (gauge manifold charge hose,
etc.) that are exclusively used for R410A installations to
withstand the pressure and to prevent foreign materials (e.g.
mineral oils and moisture) from mixing into the system.
Vacuum pump:
Use a 2-stage vacuum pump with a non-return valve
Make sure the pump oil does not flow oppositely into the system
while the pump is not working.
Use a vacuum pump which can evacuate to –14.6 psi
[–100.7 kPa (5 Torr absolute, –755 mm Hg)].
Installation manual
6
Minimal thickness
O 0.03 inch (0.80 mm)
O 0.04 inch (1.00 mm)
Refrigerant pipe size
Ø5/8 inch (15.9 mm)
Ø3/8 inch (9.5 mm)
(a)
246 ft (312 ft) (75 m (95 m))
98 ft (30 m)
≤98 ft (≤30 m)
In order to prevent dirt, liquid or dust from entering the piping,
cure the piping with a pinch or taping.
Place Installation period
More than a month
Outdoor unit
Less than a month
Regardless of the
Indoor unit
period
Great caution is needed when passing copper tubes through
walls.
Piping should be mounted so that the flare is not subjected to
mechanical stress.
Flaring guidelines
Flares should not be re-used. New ones should be made in
order to prevent leaks.
Use a pipe cutter and flare tool suitable for the refrigerant used.
Only use the flare nuts included with the unit. Using different
flare nuts may cause the refrigerant to leak.
Please refer to the table for flaring dimensions and tightening
torques (too much tightening will result in splitting the flare).
Piping Tightening
size torque
Ø3/8 inch 24.34~28.76 lbs•ft
(9.5 mm) (33~39 N•m)
Ø5/8 inch 46.47~55.32 lbs•ft
(15.9 mm) (63~75 N•m)
When connecting the flare nut, coat the flare inner surface with
ether oil or with ester oil and initially tighten 3 or 4 turns by hand
before tightening firmly.
When loosening a flare nut, always use two wrenches together.
When connecting the piping, always use a spanner and torque
wrench together to tighten the flare nut to prevent flare nut
cracking and leaks.
1
4 3
Not recommended, but in case of emergency
Should you be forced to connect the piping without a torque
wrench, follow the following installation method:
Tighten the flare nut using a spanner until the tightening
torque suddenly increases.
From that position further tighten the flare nut the angle listed
below:
Further tightening
Piping size angle (degrees)
Ø3/8 inch (9.5 mm)
Ø5/8 inch (15.9 mm)
Protection method
Pinch the pipe
Pinch or tape the pipe
Flare
dimensions A Flare shape
90 ±2
0.50~0.52 inch
(12.8~13.2 mm)
A
R=0.02~0.04 inch
0.76~0.78 inch
(=0.4~0.8 mm)
(19.4~19.7 mm)
1 Torque wrench
2 Spanner
3 Piping union
2
4 Flare nut
Recommended arm
length of spanner
60~90 ±8 inch (200 mm)
30~60 ±12 inch (300 mm)
ERLQ036~054BAVJU
Outdoor unit for air to water heat pump
4PW55905-1