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3
CONNECTING THE PIPING
CAUTION
Do not over tighten, over tightening cause gas leakage.
Model
UX09*E5*, UX12*E5*, UD12*E5*, UD16*E5*,
UX09*E8*, UX12*E8*, UX16*E8*, UD09*E8*,
UD12*E8*, UD16*E8*
CONNECTING THE PIPING TO OUTDOOR UNIT
Decide piping length and then cut by using pipe cutter. Remove burrs
from cut edge. Make flare after inserting the flare nut (locate at valve)
onto the copper pipe. Align center of piping to valves and then tighten
with torque wrench to the specified torque as stated in the table.
Local pipes can project in any of four directions.
• Make holes in the pipe panels for the pipes to pass through.
• Be sure to install the pipe panels to prevent rain from getting
inside the outdoor unit.
[Removing the service panel].
(1) Remove the three mounting screws.
(2) Slide the service panel downward to release the pawls.
After this, pull the service panel toward you to remove it.
Forward
direction
Mounting
screws
Close the tube joining area with
putty heat insulator (local supply)
without any gap as shown in right
figure. (To prevent insects or small
animal entering.)
4
Piping size (Torque)
Gas
Liquid
ø15.88mm
ø9.52mm
(5/8")
(3/8")
[65 N•m]
[42 N•m]
Service panel
Rear direction
Rear pipe panel
Side panel
Front pipe panel
Downward
direction
Putty or Heat
insulator
(local supply)
CUTTING AND FLARING
THE PIPING
1. Please cut using pipe cutter and then remove the burrs.
2. Remove the burrs by using reamer. If burrs is not removed, gas
leakage may be caused. Turn the piping end down to avoid the
metal powder entering the pipe.
3. Please make flare after inserting the flare nut onto the copper
pipes.
Pipe
Reamer
Point
Clamp
down
handle
1. To cut
2. To remove burrs
Q Improper flaring Q
Inclined Surface
Cracked Uneven
thickness
damaged
4
EVACUATION OF THE
EQUIPMENT
WHEN INSTALLING AN AIR-TO-WATER HEAT PUMP, BE SURE TO
EVACUATE THE AIR INSIDE THE UNIT AND PIPES in the following
procedure.
Liquid side
Indoor unit
Gas side
Vacuum
pump
adaptor
Vacuum
CLOSE
pump
OPEN
1. Connect a charging hose with a push pin to the Low side of a
charging set and the service port of the 3-way valve.
• Be sure to connect the end of the charging hose with the push
pin to the service port.
2. Connect the center hose of the charging set to a vacuum pump
with check valve, or vacuum pump and vacuum pump adaptor.
3. Turn on the power switch of the vacuum pump and make sure that
the needle in the gauge moves from 0 cmHg (0 MPa) to –76 cmHg
(–0.1 MPa). Then evacuate the air approximately ten minutes.
4. Close the Low side valve of the charging set and turn off the
vacuum pump. Make sure that the needle in the gauge does not
move after approximately five minutes.
Note :
BE SURE TO FOLLOW THIS PROCEDURE IN ORDER
TO AVOID REFRIGERANT GAS LEAKAGE.
5. Disconnect the charging hose from the vacuum pump and from the
service port of the 3-way valve.
6. Tighten the service port caps of the 3-way valve at a torque of
18 N•m with a torque wrench.
7. Remove the valve caps of both of the 2-way valve and 3-way
valve. Position both of the valves to "OPEN" using a hexagonal
wrench (4 mm).
8. Mount valve caps onto the 2-way valve and the 3-way valve.
• Be sure to check for gas leakage.
Handle
0 – 0.5 mm
Bar
Bar
Yoke
Core
Copper
Red arrow mark
pipe
3. To flare
When properly flared, the internal
surface of the flare will evenly shine
and be of even thickness. Since the
flare part comes into contact with the
connections, carefully check the flare
finish.
Outdoor unit
Two-way valve
Close
Three-way valve
Close
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