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28
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'11 • KX-T-166
4-4. Additional charge of refrigerant
(When washing pipes using the re-fresh kit, do not charge additional refrigerant before connecting the kit.)
●
Refrigerant must be in the state of fluid when charging.
●
Make sure to use a measuring device when charging the refrigerant.
When it cannot charge whole required quantity because the outdoor unit is stopped, operate the unit in the test run mode and charge. (See Section 8 for the method of test run.)
Operating the unit for a long period of time with insufficient quantity of refrigerant could cause malfunction on the compressor. (When charging while operating the unit,
especially, complete the charge within 30 minutes.)
This unit contains 11.5 kg of refrigerant.
Calculate necessary quantity of additional charge with the following formula, and record the quantity of additionally charged refrigerant on the refrigerant quantity list provided
on the back of service panel.
●
Charge the additional refrigerant depending on the size and length of fluid pipe. Determine the quantity of additional charge by rounding the second place after decimal point,
which means in the unit of 0.1 kg.
(2) Air purge
(When washing pipes using the re-fresh kit, do not air purge before connecting the kit.)
Perform the air purge from both the operation check joints at fluid side and gas side.
This product uses R410A. Take care of the following points.
To avoid contamination with different type of oil, use separate tools depending on the type of refrigerant. It is prohibited especially to
use the gauge manifold and the charge hose for different types of refrigerant (R22, R407C).
Use a reverse flow prevention adaptor to prevent the contamination of refrigerant system with vacuum pump oil.
<Work flow>
When the needle pointer of vacuum gauge has crept up, it means that there is moisture in or leakage
from the system. Identify and repair the leaking position and then perform the air purge again.
Operate the vacuum pump for more than 1 hour
after achieving -101 kPa or under (-755 mmHg
or under.
After letting it alone for
more than 1 hour, the
pointer needle of vacuum
gauge should not creep
up.
CAUTION
Insufficient
degree
of
vacuum causes a capacity
shortage,
clogging
by
remaining
moisture
or
malfunction of compressor
L3: Tot al length of ø15.88 pipes (m), L4: Total length of ø12.7 pipes (m)
L5: Total length of ø0.952 pipes (m), L6: Total length of ø6.35 pipes (m)
●
This product uses R410A. Take care of the following points.
∙ To avoid contamination with different type of oil, use separate tools depending on the type of refrigerant. It is prohibited especially to use the gauge manifold and the charge
hose for different types of refrigerant (R22, R407C).
∙ Type of refrigerant is indicated with the color painted on the container (Yellow for R410A). Sufficient care must be taken to use correct refrigerant only.
∙ Never use a charge cylinder. Otherwise, the composition of refrigerant may change when introducing R410A into the cylinder.
∙ Make sure to charge the refrigerant in the state of fluid.
Completion of air tightness test
Start of air purge
Completion of air purge
Degree of vacuum check
Refrigerant charg
e
Additional charge quantity (kg)
=
2.5
+
(L3×0.17)
+
(L4×0.11)
+
(L5×0.054)
+
(L6×0.022)
●
Request
Record the refrigerant quantity calculated based
on the piping length in the refrigerant quantity
list provided on the back of service panel.
4-5. Heat insulation and moisture condensation proof
Standard additional refrigerant quantity
Make sure to charge this quantity in addition
to the charge quantity for the refrigerant piping.
Charge quantity for the refrigerant piping
(1) Dress refrigerant pipes (both gas and liquid pipes) for heat insulation and prevention of dew condensation.
Improper heat insulation/anti-dew dressing can result in a water leak or dripping causing damage to household effects, etc.
(2) Use a heat insulating material that can withstand 120
℃
or a higher temperature. Poor heat insulating capacity can cause
heat insulation problems or cable deterioration.
●
All gas pipes must be securely heat insulated in order to prevent damage from dripping water that comes from the
condensation formed on them during a cooling operation or personal injury from burns because their surface can reach quite
a high temperature due to discharged gas flowing inside during a heating operation.
●
Wrap indoor units’ flare joints with heat insulating parts (pipe cover) for heat insulation (both gas and liquid pipes).
●
Give heat insulation to both gas and liquid side pipes. Bundle a heat insulating material and a pipe tightly together so that
no gaps may be left between them and wrap them together with a connecting cable by a dressing tape.
●
Although it is verified in a test that this air conditioning unit shows satisfactory performance under JIS condensation test
conditions, both gas and liquid pipes need to be dressed with 20mm, or over, heat insulation materials additionally above
the ceiling where relative humidity exceeds 70%.
Refrigerant pipe size
Additional charge quantity(kg/m
）
ø15.88
0.17
ø12.7
0.11
ø9.52
0.054
ø6.35
0.022
Remark
Attached on the back of service panel.
CAUTION
Make sure to enter the data. The data is required at maintenance or service.
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Where water drained from the outdoor unit may freeze, connect the drain pipe using optional drain elbow and
drain grommet.
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Outdoor unit has 4 drain outlets on the bottom.
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When guiding drain water to a scupper, etc, install the parts on a flat stand (optional item), blocks, or other.
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Connect the drain elbow as shown by the figure. Seal remaining holes with grommets.
●
When draining water collectively, use holes for wires and pipes opened other than on the bottom. When this is
impracticable, sufficiently seal the drain pipe to prevent water leakage.
Drain elbow (1 pc)
Drain grommet (3 pcs.)
Commercial general purpose hard
polycarbonate pipe, VP-16
Wires for connecting indoor
and outdoor units
Exterior tape
Gas piping
Insulation
Liquid piping
Band (accessory)
Pipe cover (accessory)
Refrigerant quantity label
5. Drainage
