Connecting The Piping - Panasonic UD03*E5* Installation Manual

CONNECTING THE PIPING

3
CONNECTING THE PIPING TO OUTDOOR UNIT
Decide piping length and then cut by using pipe cutter. Remove burrs
from cut edge. Make fl are after inserting the fl are nut (locate at valve)
onto the copper pipe. Align center of piping to valves and then tighten
with torque wrench to the specifi ed torque as stated in the table.
Model
UD03*E5* and ø12.7mm (1/2")
UD05*E5*
UD07*E5* and ø15.88mm (5/8")
UD09*E5*
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 fl are after inserting the fl are nut onto the copper pipes.
Point
down
1. To cut 2. To remove burrs
EVACUATION OF THE EQUIPMENT
4
WHEN INSTALLING AN AIR-TO-WATER HEAT PUMP, BE SURE TO EVACUATE THE AIR INSIDE THE UNIT AND PIPES in the following
procedure.
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 fi ve 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.
4
Piping size (Torque)
Gas Liquid
ø6.35mm (1/4")
[55 N•m] [18 N•m]
ø6.35mm (1/4")
[65 N•m] [18 N•m]
CUTTING AND FLARING THE PIPING
Pipe
Handle
Reamer
Bar
Yoke
Core
Clamp
handle Red arrow mark
3. To fl are
Indoor unit
Vacuum
pump
adaptor
Vacuum
pump
Spanner
or Wrench
Be sure to use two spanners to tighten.
(If the nuts are overtightened, it may cause the fl ares to break or
leak.)
Close the tube joining area with
putty heat insulator (local supply)
without any gap as shown in right
fi gure. (To prevent insects or small
animal entering.)
(For UD07*E5* and UD09*E5* only)
 Improper fl aring 
0 – 0.5 mm
Bar
Inclined Surface
Copper pipe
damaged
Liquid side
Two-way valve
Close
Gas side
Three-way valve
Close
CLOSE
OPEN
Torque
wrench
When properly fl ared, the internal
surface of the fl are will evenly shine
and be of even thickness. Since the
fl are part comes into contact with
Cracked Uneven
the connections, carefully check
thickness
the fl are fi nish.
Outdoor unit
Putty or Heat
insulator
(local supply)