11
6. Refrigerant piping work
Cautions On Refrigerant Piping
Be sure to use non-oxidative brazing for brazing to ensure that no foreign
matter or moisture enter into the pipe.
Be sure to apply refrigerating machine oil over the flare connection seating
surface and tighten the connection using a double spanner.
Provide a metal brace to support the refrigerant pipe so that no load is
imparted to the indoor unit end pipe. This metal brace should be provided
50 cm [19-11/16 in] away from the indoor units flare connection.
6.4. Purging procedures leak test
6.5. Drain piping work
Ensure that the drain piping is downward (pitch of more than 1/100) to the outdoor
(discharge) side. Do not provide any trap or irregularity on the way.
Ensure that any cross-wise drain piping is less than 20 m [65 ft] (excluding the
difference of elevation). If the drain piping is long, provide metal braces to prevent it
from waving. Never provide any air vent pipe. Otherwise drain may be ejected.
Use a hard vinyl chloride pipe VP-25 (with an external diameter of 32 mm [1-1/4 in])
for drain piping.
Ensure that collected pipes are 10 cm [3-15/16 in] lower than the unit bodys drain
port.
Do not provide any odor trap at the drain discharge port.
Put the end of the drain piping in a position where no odor is generated.
Do not put the end of the drain piping in any drain where ionic gases are generated.
[Fig. 6-5-1] (P.4)
Grouped piping
1. Insert the drain hose (accessory) into the drain port (insertion margin: 25mm
[1 in]).
(The drain hose must not be bent more than 45° to prevent the hose from
breaking or clogging.)
(Attach the hose with glue, and fix it with the band (small, accessory).)
2. Attach the drain pipe (O.D. ø32 mm [1-1/4 in] PVC TUBE PV-25, field supply).
(Attach the pipe with glue, and fix it with the band (small, accessory).)
3. Perform insulation work on the drain pipe (O.D. ø32 mm [1-1/4 in] PVC TUBE PV-
25) and on the socket (including elbow).
4. Check the drainage. (Refer to [Fig. 6-6-1])
5. Attach the insulating material (accessory), and fix it with the band (large,
accessory) to insulate the drain port.
[Fig. 6-5-2] (P.4)
6.6. Confirming drain discharge
Make sure that the drain-up mechanism operates normally for discharge
and that there is no water leakage from the connections.
Be sure to confirm the above in a period of heating operation.
Be sure to confirm the above before ceiling work is done in the case of a new
construction.
1. Remove the water supply port cover on the same side as the indoor unit piping.
2. Fill water into the feed water pump using a feed water tank. In filling, be sure to put
the end of the pump or tank in a drain pan. (If the insertion is incomplete, water
may flow over the machine.)
3. Perform the test run in cooling mode, or connect the connector to the ON side of
SWE on the Indoor controller board. (The drain pump and the fan are forced to
operate without any remote controller operation.) Make sure using a transparent
hose that drain is discharged.
4. After confirmation, cancel the test run mode, and turn off the main power. If the
connector is connected to the ON side of SWE, disconnect it and connect it to the
OFF side, and attach the water supply port cover into its original position. (Tighten
the screws of the water supply port cover to the torque of 2.0 ±0.2 N·m.)
[Fig. 6-6-1] (P.5)
Check the vacuum with the gage manifold valve, then close the gage manifold
valve, and stop the vacuum pump.
Leave it as is for one or two minutes. Make sure the pointer of the gage manifold
valve remains in the same position. Confirm that the pressure gage show
-0.101 MPa (-760 mmHg).
*4 to 5 turns
Remove the gage manifold valve quickly from the service port of the stop valve.
After refrigerant pipes are connected and evacuated, fully open all stop valves on
gas and liquid pipe sides.
Operating without fully opening lowers the performance and causes trouble.
Pipe length:
7 m [23 ft] maximum
No gas charge is needed.
Pipe length exceeding 7 m [23 ft]
Charge the prescribed
amount of gas.
Hexagonal wrench
*Open
*Close
Stop valve
Stop valve
Service port
Stop
valve
Handle
Low
-0.101MPa
(-760 mmHg)
Compound pressure gauge
(for R410A)
Pressure gauge
(for R410A)
Gauge manifold valve
(for R410A)
Handle High
Charge hose
(for R410A)
(or the vacuum
pump with the
function to
prevent the back
flow)
Charge hose
(for R410A)
Adapter for
preventing
the back flow
Window
Vacuum
pump
Tighten the cap to the service port to obtain the initial status.
Retighten the cap
Leak test
PURGING PROCEDURES
Connect the refrigerant pipes (both the liquid and gas pipes) between the indoor
and the outdoor units.
Remove the service port cap of the stop valve on the side of the outdoor unit gas
pipe. (The stop valve will not work in its initial state fresh out of the factory (totally
closed with cap on).)
Connect the gage manifold valve and the vacuum pump to the service port of the
stop valve on the gas pipe side of the outdoor unit.
Run the vacuum pump.
(Vacuumize for more than 15 minutes.)
Correct piping
Wrong piping
A
Insulation (9 mm [3/8 in] or more)
B
Downward slope (1/100 or more)
C
Support metal
K
Air bleeder
L
Raised
M
Odor trap
D
O. D. ø32 mm [1-1/4 in] PVC TUBE
E
Make it as large as possible. About 10 cm [3-15/16 in].
F
Indoor unit
G
Make the piping size large for grouped piping.
H
Downward slope (1/100 or more)
I
O. D. ø38 mm [1-1/2 in] PVC TUBE for grouped piping. (9 mm [3/8 in] or more insulation)
J
Up to 700 mm [27-9/16 in]
N
Drain hose (accessory)
O
Horizontal or slightly upgradient
A
Indoor unit
B
Tie band (accessory)
C
Visible part
D
Insertion margin
E
Drain hose (accessory)
F
Drain pipe (O.D. ø32 mm [1-1/4 in] PVC TUBE, field supply)
G
Insulating material (field supply)
H
Tie band (accessory)
I
To be gap free. The joint section of the insulation material meet must be at the top.
A
Insert pump's end 2 to 4 cm [13/16 to 1-5/8 in].
B
Remove the water supply port.
C
About 2500 cc
D
Water
E
Filling port
F
Screw
connector
SWE
OFF
ON
OFF
ON
SWE
<OFF>
<ON>
connector
SWE
OFF
ON
OFF
ON
SWE
<ON>
<OFF>
KD79P399H01.book Page 11 Tuesday, July 1, 2014 4:51 PM