Test Operation
SiENBE28-901
70
Air Cooled Refrigeration Condensing Unit
[Additional Refrigerant Charge]
Caution
Refer to the
Operation Method of Shutoff Valves
for the control method of the shutoff
valves.
Never charge liquid refrigerant directly from a gas line. Liquid compression may
cause the compressor to fail.
1. The refrigerant must be noted for this product. Calculate the amount of additional refrigerant
charge according to the label for the calculation of the amount of additional refrigerant
charge.
2. Take the following procedure for additional refrigerant charge.
Refer to “
5.3.1 Airtight Test/Vacuum Drying
” for the connection of the refrigerant cylinder.
(1) Turn on the indoor unit and control panel.
Do not turn on the outdoor unit.
(2) Charge additional refrigerant from the service port of the shutoff valve on the liquid side.
(3) If the calculated amount of refrigerant cannot be filled, take the following steps to operate the
system and continue additional refrigerant charge.
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 RUN switch of the outdoor unit and replenish refrigerant while the outdoor
unit is in operation.
d. Turn off the RUN switch of the outdoor unit after the specified amount of refrigerant is
replenished.
e.
[Caution]
Fully open the shutoff valves on the gas and liquid sides promptly. Otherwise, a piping
explosion may result from liquid sealing.
*1 The 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, additional charging 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.
2. After the additional refrigerant charge is completed, fill out the item “total amount of
additional refrigerant charge” on the label of instructions on additional refrigerant charge of
the outdoor unit with the actual amount of additional refrigerant charge.
Refer to the illustration of the label pasting position for instructions on additional refrigerant
charge (see the illustration on the above).
Control box
Label of instructions on
additional refrigerant charge
Label pasting position
