Daikin Quaternity H-Series, Engineeiring Data

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EDUS04-906_b Installation Manual
Room Air Conditioners H-Series 31
11
Refri g erant Pipin g Work
1.
Flarin g the pipe end.
1) C u t the pipe end w ith a pipe c u tter.
2) Remo v e bu rrs w ith the c u t s u rface facing do w n w ard
so that the chips do not enter the pipe.
3) P u t the flare n u t on the pipe.
4) Flare the pipe.
5) Check that the flaring is properly made.
WARNING
1) Do not u se mineral oil on flared part.
2) Pre v ent mineral oil from getting into the system as this w o u ld red u ce the lifetime of the u nits.
3) N e v er u se piping w hich has b een u sed for pre v io u s installations. Only u se par ts w hich are deli v ered w ith the u nit.
4) Do ne v er install a drier to this R410A u nit in order to g u arantee its lifetime.
5) The drying material may dissol v e and damage the system.
6) Incomplete flaring may ca u se refrigerant gas leakage.
2.
Refri g erant pipin g .
CAUTION
1) Use the flare n u t fixed to the main u nit t o pre v ent aging and deterioration.
2) To pre v ent gas leakage, apply refrigeration oil only to the inner s u rface of the flare. (Use refrigeration oil for R410A.)
3) Use tor qu e w renches w hen tightening the flare n u ts to pre v ent damage to the flare n u ts and gas leakage.
Align the centers of b oth flares and tighten the flare n u ts 3 or 4 t u rns b y hand. Then tighten them f u lly w ith the tor qu e w renches.
2-1. Caution on pipin g handlin g .
1) Protect the open end of the pipe against d u st and moist u re.
2) All pipe b ends sho u ld b e as gentle as possi b le. Use a pipe b ender for
b ending.
2-2. Selection of copper and heat insulation materials.
• W hen u sing commercial copper pipes and fittings, o b ser v e the follo w ing:
1) Ins u lation material: Polyethylene foam
Heat transfer rate: 0.041 to 0.052 W /mK (0.024 to 0.030 Bt u /fth°F (0.035 to 0.045 kcal/mh°C))
Choose heat ins u lation materials that are designed for H V AC u se.
2) Be s u re to ins u late b oth the gas and li qu id piping and to pro v ide ins u lation dimensions as b elo w .
3) Use separate thermal ins u lation pipes for gas and li qu id refrigerant pipes.
Gas side Li qu id side Gas pipe thermal ins u lation Li qu id pipe thermal ins u lation
O.D. 3/ 8 inch (9.5mm) O.D. 1/4 inch (6.4mm) I.D. 0.472-0.590 inch (12-15mm) I.D. 0.315-0.393 inch ( 8 -10mm)
Minim u m b end radi u s
Thickness 0.393 inch (10mm) Min. 1-3/16 inch (30mm) or more
Thickness 0.031 inch (0. 8 mm) (C1220T-O)
Set exactly at the position sho w n b elo w .
A
Flaring
Die A 0-0.020 inch (0-0.5mm)
Cl u tch-type
Flare tool for R410A
0.039-0.059 inch (1.0-1.5mm)
Cl u tch-type (Rigid-type)
0.059-0.079 inch (1.5-2.0mm)
W ing-n u t type (Imperial-type)
Con v entional flare tool
(C u t exactly at
right angles.) Remo v e bu rrs
Check
Flare’s inner
s
u rface m u st
b e fla w -free.
The pipe end m u st
b e e v enly flared in
a perfect circle.
Make s u re that the
flare n u t is fitted.
24.1-29.4 ft·l b f
(32.7-39.9 N ·m)
10.4-12.7 ft·l b f
(14.2-17.2 N ·m)
Flare n u t tightening tor qu e
Gas side Li qu id side
3/ 8 inch (9.5mm) 1/4 inch (6.4mm)
Do not apply refrigeration
oil to the o
u ter s u rface.
Flare n u t
Apply refrigeration oil to the
inner s
u rface of the flare.
Do not apply refrigeration
oil to the flare n
u t a v oid
tightening w ith o v er tor qu e.
[Apply oil]
Tor qu e w rench
Piping u nion
Flare n u t
Spanner
[Tighten]
W all
If no flare cap is
a
v aila b le, co v er
the flare mo u th
w ith tape to keep
dirt or w ater o u t.
Be s u re to
place a cap.
Rain
Ins u lation tape
Li qu id pipe ins u lation
Inter- u nit w iring
Gas pipe ins u lation
Gas pipe
Drain hose
Li qu id pipe