English
12
•
When pulling the ground wire out, wire it so that it comes through
the cut out section of the cup washer. (See the figure below.) An
improper ground connection may prevent a good ground from
being achieved.
•
When two wires are connected to a single terminal, connect them
so that the rear sides of the crimp contacts face each other. Also,
make sure the thinner wire is on top, securing the two wires simul-
taneously to the resin hook using the included clamp (1).
7-6 Procedure for Wiring Inside Units
•
Referring to figure 27, secure and wire the power and transmis-
sion wiring using the included clamp (1), (2), and (3).
(Refer to figure 27)
1.
Retain with accessory clamp (3).
2.
Electric conduit
3.
When routing out the power/ground wires from the left
side.
4.
When routing out the transmission wiring from the open-
ing for piping.
5.
When routing out the power/ground wires from the front.
6.
Clear over 50 mm.
7.
When routing out the transmission wiring from the
knockout hole.
8.
Retain to the back of the column support with the acces-
sory clamp (2).
9.
When routing out the power/ground wires from the right
side.
10.
Power wiring
11.
Transmission wiring
12.
Ground wire
13.
Secure to the back side of the support beam using the
accessory clamp (1).
14.
Retain to the back of the column support with the acces-
sory clamp (2).
15.
When wiring, exercise sufficient caution not to detach the
acoustic insulators from the compressor.
CAUTION
• The transmission wiring must be at least 50 mm away from the
power wiring.
•
Make sure all wiring do not contact to the pipes (hatching parts in
the figure 27).
•
After wiring work is completed, check to make sure there are no
loose connections among the electrical parts in the
EL.COMPO.BOX.
8.
AIR TIGHT TEST AND VACUUM DRY-
ING
Note
•
Always use nitrogen gas for the airtightness test.
•
Absolutely do not open the shutoff valve until the main power cir-
cuit insulation measurement has been completed. (measuring
after the shutoff valve is opened will cause the insulation value to
drop.)
8-1 Preparations
<Needed tools>
<The system for air tight test and vacuum drying>
•
Referring to figure 28, connect an nitrogen tank, refrigerant tank,
and a vacuum pump to the outdoor unit.
The refrigerant tank and the charge hose connection to refrigerant
charge port or the valve A, C in figure 28 are needed in “11. ADDI-
TIONAL REFRIGERANT CHARGE AND CHECK OPERATION”.
•
The shutoff valve and valve A~C in figure 28 should be open or
closed as shown in the table below.
(Refer to figure 28)
1.
Gauge manifold
2.
Nitrogen
3.
Measuring device
4.
R410A tank (with siphon)
5.
Vacuum pump
6.
Charge hose
7.
Liquid side shutoff valve
8.
Gas side shutoff valve
9.
Shutoff valve service port
10.
Valve B
11.
Valve C
12.
Valve A
13.
Outdoor unit
14.
Refrigerant charge port
15.
To indoor unit
16.
Interunit pipings
17.
Refrigerant flow
Note
•
The airtightness test and vacuum drying
should be done using the liquid side and
gas side shutoff valve service ports.
See the [R410A] Label attached to the front
plate of the outdoor unit for details on the
location of the service port (see figure at
right).
•
See
[Shutoff valve operation procedure]
in
“11-1 Before working” for details on handling
the shutoff valve.
•
The refrigerant charge port is connected to
unit pipe.
When shipped, the unit contains the refrigerant, so use caution
when attaching the charge hose.
8-2 Air tight test and vacuum drying method
After finished piping work, carry out air tight test and vacuum drying.
<Air tight test>
Pressurize the liquid and gas pipes to 3.3MPa (33bar) (do not
pressurize more than 3.3MPa (33bar)). If the pressure does not
drop within 24 hours, the system passes the test.
If there is a pressure drop, check for leaks, make repairs and per-
form the airtight test again.
<Vacuum drying>
Evacuate the system from the liquid and gas pipes by using a vac-
uum pump for more than 2 hours and bring the system to
–100.7kPa or less. After keeping the system under that condition
for more than 1 hour, check if the vacuum gauge rises or not. If it
rises, the system may either contain moisture inside or have leaks.
Crimp-style terminal
Cup washer
Cut out section
Terminal
block
Crimp-style
terminal
Wire: narrow
Wire: thick
Resin hook
Gauge manifold
Charge hose
valve
• To prevent entry of any impurities and insure suffi-
cient pressure resistance, always use the special
tools dedicated for R410A.
• Use charge hose that have pushing stick for con-
necting to service port of shutoff valves or refriger-
ant charge port.
Vacuum pump
• The vacuum pump for vacuum drying should be able
to lower the pressure to –100.7kPa
(5 Torr –755mm Hg).
• Take care the pump oil never flow backward into the
refrigerant pipe during the pump stops.
State of valve A, B and C and
shutoff valves
Valve
shutoff valve
A
B
C
Liquid
side
Gas
side
Air tight test, Vacuum drying
(Close valve A and shutoff valves
certainly. Otherwise the refrigerant
in the unit are released.)
Close Open Open
Close
Close
[R410A] Label
01_EN_3P226891-13Q.fm Page 12 Thursday, December 2, 2010 10:15 AM
