Installation Position; Piping Connection - Hitachi E-52XN Installation Manual

4.2. INSTALLATION POSITION

Horizontal Installation
Locate the branch pipes on the same horizontal plane.
(Inclination Max. 30°) Make the straight length a minimum of
0.5 m after the vertical bend.
CORRECT
Straight length
min 0.5 m
Upward
Downward
Inclination
Max. ± 30°
Vertical Installation
CORRECT
Upward
Downward Branch
Straight length
min 0.3 m
Downward

4.3. PIPING CONNECTION

When connecting liquid piping for the unit with a capacity of 2HP or
smaller and with the length of piping is 15 meters or longer, apply
a,piping size of φ9.53mm. Fix the connecting pipe as shown in the
figure below. Utilize the insulation attached to the Multi-Kit.
Make flares after attaching flare nut to
the connecting pipe. (Accessory)
Utilize the flare nut
of the indoor unit.
Indoor Unit
Insulation attached
to indoor unit.
1. Utilize clean copper pipes without any moisture and foreign materials
on the interior surface of pipes.When connecting refrigerant piping,
cut copper pipes with a pipe cutter and blow the pipes with nitrogen,
remaining no dust inside the pipe. Do not utilize a saw and a
grindstone and others which causes a great amount of powder.
2. When cutting the pipe, secure the part for brazing as shown in the
following table.
INCORRECT
Upward
Downward
Inclination
Max. ± 30°
CORRECT
Upward
Straight length
min 0.5 m
Downward Branch
Downward
Insulate this part with insulation.
(Accessory)
Fix this part with the
cord band or vinyl tape.
Field-supplied refrigerant piping.
Field-Supplied insulation
Brazing
A: Outer B: Minimum
Diameter
5 O.D. <8
8 O.D. <12
12 O.D. <16
16 O.D. <25
25 O.D. <35
35 O.D. <45
Cautions for Refrigerant Piping
When installing the pipe
through the wall, secure a
cap at the end of the pipe.
Put the cap
or vinyl tape.
Correct
Incorrect
Rain
Cap or Vinyl
Bag Rubber
Rain can
invade.
Band
Correct Incorrect
3. Make sure that the stop valves are closed completely.
4. Blow the inside of the pipes with nitrogen when brazing.
DANGER:
Check for the refrigerant leakage in detail. If a large refrigerant
leakage occurs, it will cause difficulty with breathing or harmful
gases would occur if a fire were being used in the room.
5. An air tight test pressure of this product is 4.15MPa.
6. Attach insulation packed with Multi-Kit to each branch utilizing a vinyl
tape. Also attach insulation to piping supplied in the field. Set up the
insulation closely by field supplied tape.
NOTE:
When polyethylene foam is applied, a thickness of 10mm for the
liquid piping and 15mm to 20mm for the gas piping is
recommended. (Utilize insulation for gas piping with a heat
°
resistance of 100 C)
Do not make a space.
Tape (Accessory)
CAUTION:
- When the temperature of the piping decrease to room
temperature, perform insulation work. If insulation work is
performed immediately after brazing, insulation can melt.
- If the ends of piping system are open to the atmosphere for a
while after accomplishing piping work, securely put caps or vinyl
bags to the ends of the piping, avoiding the intrusion of moisture
and dust. After installing work has been finished, it is recommend
that this manual shall be retained carefully by a customer.
ENG -P5413794, PMML00100A-rev.0-02/05
Depth
B
6
7
8
10
12
14
Do not place the piping
directly on the ground.
Put the cap
or vinyl tape.
Correct
Incorrect
Field Supplied Insulation
Factory Supplied Insulation