Installation manual
17
LREQ5~20B7Y1
Air cooled refrigeration condensing unit
4PW74302-1D – 2016.11
[The evaporation temperature setting]
Refer to the following table for the evaporation temperature.
• The evaporation temperature is set up by dip switches (DS1).
WARNING
• Use protective gear (e.g., protective gloves and glasses) at the
time of refrigerant filling.
• Pay attention to the rotation of the fan whenever the front panel is
opened while working.
The fan can rotate continuously for a while after the outdoor unit
stops operating.
• Make sure there is no oxygen in the system. Refrigerant may only
be charged after performing the leak test and the vacuum drying.
[Refrigerant replenishment work]
CAUTION
• Refer to the
"Operation Method of Shutoff Valves" on page 9
for the
control method of the shutoff valves.
• Never replenish liquid refrigerant directly from a gas line. Liquid
compression may cause the compressor to fail.
• When the refrigerant charging procedure is done or when pausing,
close the valve of the refrigerant tank immediately. If the valve is
not closed immediately, remaining pressure might charge
additional refrigerant.
Possible consequence:
Incorrect
refrigerant amount.
1. The refrigerant must be noted for this product. Calculate the amount
of refrigerant replenishment according to the label for the calcula-
tion of the amount of refrigerant replenishment or according to the
"12. ADDITIONAL REFRIGERANT AMOUNT" on page 19
.
In case re-charge is required, refer to the nameplate of the unit. It
states the type of refrigerant and necessary amount.
(5) Take the following procedure for refrigerant replenishment.
"8-1 Airtight test/vacuum drying" on page 15
connection of the refrigerant cylinder.
(6) Turn on the indoor unit and control panel.
Do not turn on the outdoor unit.
(7) Replenish refrigerant from the service port of the shutoff valve on
the liquid side.
(8) If the calculated amount of refrigerant cannot be filled, take the
following steps to operate the system and continue refrigerant
replenishment.
a. Open the gas shutoff valve all the way and adjust the opening of
the liquid shutoff valve (*1).
b.
[Warning/electric shock warning]
Turn on the outdoor unit.
c.
[Warning/electric shock warning]
Turn on the operation switch of the outdoor unit and replenish
refrigerant while the outdoor unit is in operation.
d.Turn off the operation switch of the outdoor unit after the speci-
fied amount of refrigerant is replenished. (To prevent liquid
compression)
e.
[Caution]
Fully open the shutoff valves on the gas and liquid sides
promptly. Otherwise, a piping explosion may result from liquid
sealing.
*1The cylinder’s internal pressure will drop when there is little
refrigerant remaining in the cylinder, making it impossible to charge
the unit, even if the liquid shutoff valve opening is adjusted. In this
situation, replace the cylinder with one that has more refrigerant
remaining.
Additionally, if the piping length is long, replenishing while the liquid
shutoff valve is fully closed may lead to activation of the protection
system, causing the unit to stop operation.
1. After the work is completed, apply a screw lock agent (for flare nuts)
to the screws of the shutoff valves and service ports. Refer to the
"Handling precautions for valve cover" on page 10
and
Precautions for Service Port" on page 10
for the handling of the valve covers
and service ports.
(9) After the refrigerant replenishment is completed, fill out the item
“total amount of refrigerant replenishment” on the label of
instructions on refrigerant replenishment of the outdoor unit with
the actual amount of refrigerant replenishment.
Refer to the illustration of the label pasting position for instructions
on refrigerant replenishment (see the illustration on the above).
[Precautions for refrigerant cylinder]
At the time of refrigerant filling, check whether the siphon tube is
provided. Then locate the cylinder so that the refrigerant will be filled in
the state of liquid (see table below).
R410A is a mixed refrigerant, the composition of which may change
and the normal operation of the system may not be possible if the
refrigerant is filled in the state of gas.
+10°C
the position
of switches
–10°C
–15°C
–20°C
DS1
–5°C
(Factory Set)
0°C
–35°C
The evaporation
temperature setting
–25°C
+5°C
–45°C
–30°C
–40°C
DS1
DS1
ON
OFF
( )
4
2
1
3
2
4
1
3
1
3
2
4
Cylinder provided with siphon tube.
Other cylinders
Label of instructions on
refrigerant replenishment
Label pasting position
Control box
Stand the cylinder upright and fill the refrigerant.
(There is a siphon tube inside, which makes it
possible to replenish the refrigerant in the state of
liquid without setting the cylinder upside down.)
Stand the cylinder upside down and fill the
refrigerant.
(Pay attention so that the cylinder
will not topple down.)
4PWEN74302-1D.book Page 17 Thursday, April 27, 2017 9:01 PM
