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11
English
NOTE
Refrigerant cannot be charged until fi eld wiring has been
•
completed.
Refrigerant may only be charged after performing the air-
tight test and the vacuum drying (see above).
When charging refrigerant into the system, take care that its
maximum allowable charge is never exceeded, in view of the
danger of liquid hammer.
Refrigerant containers shall be opened slowly.
To avoid compressor breakdown, do not charge the refriger-
ant more than the specifed amount to raise the condensing
pressure.
This outdoor unit is factory charged with refrigerant.
•
Charge the additional refrigerant calculated by the formula
•
below.
Additional charging amount
=
Liquid piping length × 0.036
(lb.)
(ft.)×0.036
Record the additional amount to the label sticked on the back
of front panel.
Charge the refrigerant to the liquid pipe in its liquid state.
•
Since R410A is a mixed refrigerant, its composition changes
if charged in a state of gas and normal system operation
would no longer be assured.
Before fi lling, check whether the tank has a siphon attached
•
or not.
How to fi ll a tank with a siphon attached.
There is a siphon tube
inside, so there is no need
to turn the tank upside-down.
Fill with the tank upright.
Other ways of fi lling the tank
Fill with the tank upside-down.
Determine the amount of refrigerant to be added by referring
•
to the table in “6-6 Example of connection”, write it down on
the label sticked on the back side of the front cover.
After the vacuum drying is fi nished, charge the additional
•
refrigerant in its liquid state through the liquid stop valve
service port.
Taking into account following instructions:
Check that gas and liquid stop valves are closed.
1.
Charge the specifi ed amount of refrigerant.
2.
If the outdoor unit is not in operation and the total amount
•
cannot be charged, follow the procedures for additional
refrigerant charge shown below.
Make sure to use installation tools you exclusively use on
•
R410A installations to withstand the pressure and to prevent
foreign materials from mixing into the system.
Procedures for charging additional refrigerant.
•
Nitrogen
Dotted lines
represent
field piping
Cylinder
Stop valve service port
Vacuum pump
Weighing
scale
Charge hose
R410A
Pressure
reducing
valve
Outdoor unit
Indoor units
Liquid line
Gas line
(Siphon system)
Valve A
See the “Service Precautions” label on the back of the front
panel for the settings for operation after replenishing refriger-
ant.
Open the gas line stop valve (leaving the liquid line stop
1.
valve, valve A in the diagram above, close) and perform the
operation to add the refrigerant.
Once the appropriate amount of refrigerant is in, press the
2.
confi rmation button (BS3) on the outdoor unit PC board
(A1P), and stop operation.
Open the stop valves quickly (both liquid and gas line
3.
valves).
(This must be done quickly to avoid the possibility that the
pipe might burst.)
Stop valve operation method
Cautions on handling the stop valve
The fi gure below shows the name of each part required in
•
handling the stop valve. At the time of shipment, the stop
valve is closed.
If only a torque wrench is used to loosen or tighten the fl are
•
nut, the side plate may be distorted. Make sure to fi x the
stop valve with a spanner, then loosen or tighten the fl are
nut with a torque wrench.
When it is expected that the operating pressure will be low
•
(for example, when cooling will be performed while the
outside air temperature is low), seal suffi ciently the fl are nut
in the stop valve on the gas line with silicon sealant to
prevent freezing.
[Stop valve operation method]
Prepare hexagon wrenches (whose size is 4 mm and 6 mm).
How to open the stop valve
Insert a hexagon wrench into the valve stem, and turn the
1.
valve stem counterclockwise.
When the valve stem cannot be turned any more, stop
2.
turning. Now, the valve is open.
How to close the stop valve
Insert a hexagon wrench into the valve stem, and turn the
1.
valve stem clockwise.
When the valve stem cannot be turned any more, stop
2.
turning. Now, the valve is closed.
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Summary of Contents for SkyAir RZQ18PVJU
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