15 Charging refrigerant
Installation and operation manual
31
LRYELRNUN5A7Y1
CO
₂
Conveni-Pack outdoor unit and capacity up unit
4P605461-1B – 2020.08
X2M
Output signals:
d: Caution
e: Warning
f: Run
X2M
PE
X1M
1
2
g
g
Wiring intake (knockout hole) for high voltage. See
"14.3 Guidelines when knocking out knockout
holes"
27].
Details – Output signals
NOTICE
Output signals
. The outdoor unit is provided with a
terminal (X2M) that can output 3 different signals. The
signal is 220~240 V AC. The maximum load for all signals
is 0.5 A. The unit outputs a signal in the following
situations:
▪ C/C1:
caution
signal – connection recommended –
when an error occurs that does not stop unit operation.
▪ C/W1:
warning
signal – connection recommended –
when an error occurs that causes unit operation to
stop.
▪ R/P2:
run
signal – connection optional – when the
compressor is running.
Wiring output signals:
Wiring
Sheathed cable (2 wires)
Vinyl cords
0.75~1.25 mm²
Maximum wiring length
130 m
Details – Power supply:
"14.5 Specifications of standard wiring components"
27].
15
Charging refrigerant
15.1
Precautions when charging
refrigerant
CAUTION
A vacuumed system will be under triple point. Therefore,
ALWAYS start charging with R744 in vapour state. When
the triple point is reached (5.2 bar absolute pressure or
4.2 bar gauge pressure), you may continue charging with
R744 in liquid state.
INFORMATION
For the operation method of the stop valves, refer to
"13.2 Using stop valves and service ports"
20].
WARNING
▪ Only use R744 (CO
2
) as refrigerant. Other substances
may cause explosions and accidents.
▪ When installing, charging refrigerant, maintaining or
performing service, ALWAYS use personal protective
equipment, such as safety shoes, safety gloves and
safety glasses.
▪ If the unit is installed indoors (for example, in a
machine room), ALWAYS use a portable CO
2
detector.
▪ If the front panel is open, ALWAYS beware of the
rotating fan. The fan will continue rotating for a while,
even after the power switch has been turned off.
WARNING
The unit is already filled with a certain amount of R744. Do
NOT open liquid and gas stop valves until all checks from
the
"17.2 Checklist before commissioning"
34] are
completed.
CAUTION
Do NOT charge liquid refrigerant directly from a gas line.
Liquid compression could cause compressor operation
failure.
NOTICE
If the power of some units is turned off, the charging
procedure cannot be finished properly.
NOTICE
Be sure to turn on the power 6 hours before operation in
order to have power running to the crankcase heater and
to protect the compressor.
NOTICE
Before starting charging procedures, check if the 7‑LEDs
display is as normal (see
33]). If a malfunction code is present, see
"18.1 Solving problems based on error codes"
37].
NOTICE
Close the front panel before any refrigerant charge
operation is executed. Without the front panel attached the
unit cannot judge correctly whether it is operating properly
or not.
NOTICE
In case of maintenance and the system (outdoor unit+field
indoor units) does not contain any refrigerant any
more (e.g., after refrigerant reclaim operation), the unit has
to be charged with its original amount of refrigerant (refer
to the nameplate on the unit) and the determined additional
refrigerant amount.
NOTICE
Do NOT fully close the liquid stop valve after the refrigerant
has been charged into the unit.
NOTICE
Do NOT fully close the liquid stop valve while the unit is
stopping. The field liquid piping might burst because of
liquid seal.
