Installation manual
13
ERSQ+ERRQ011~Y1
Outdoor unit for air to water heat pump
4PW49635-1C
8.3.
Method for adding refrigerant
Precautions when adding R410A
■
Make sure to charge the refrigerant in liquid state to the liquid
pipe. Since R410A is a mixed refrigerant, its composition
changes if charged in its gaseous state and normal system
operation would then no longer be assured.
■
Before charging, check whether the refrigerant cylinder has a
syphon attached or not and position the cylinder accordingly.
How to connect the tank?
When the refrigerant tank is connected and the specified operation is
performed, the appropriate amount of refrigerant will be charged into
the system. The refrigerant must be charged according to the
procedure described below.
Charging while the outdoor unit is at a standstill
See the figure in
"How to connect the tank?" on page 13
1
Determine the weight of refrigerant to be charged additionally
referring to the item "Additional refrigerant charge" in
"Calculating the additional refrigerant charge" on page 12
and fill
in the amount in the "Additional refrigerant charge label"
attached to the unit.
2
After the vacuum drying is finished, open valve A and charge the
additional refrigerant in its liquid state through the service port
on the liquid stop valve taking into account following instructions:
-
Turn on the power supply of the outdoor unit and indoor unit
(main circuit breaker on).
-
Check that gas and liquid stop valves are closed.
-
Stop the compressor and charge the specified weight of
refrigerant.
9.
E
LECTRICAL
WIRING
WORK
9.1.
Precautions on electrical wiring work
■
Before obtaining access to terminal devices, all supply circuits
must be interrupted.
■
Use only copper wires.
■
Do not turn on the main switch until all the wiring is completed.
■
Never squeeze bundled cables into a unit.
■
Secure the electrical wiring with clamping material as shown in
so that it does not come in contact with the piping,
particularly on the high-pressure side.
Make sure no external pressure is applied to the terminal
connectors.
■
When installing the earth leakage breaker make sure that it is
compatible with the inverter (resistant to high frequency
electrical noise) to avoid unnecessary opening of the earth
leakage breaker.
■
As this unit is equipped with an inverter, installing a phase
advancing capacitor not only will deteriorate power factor
improvement effect, but also may cause capacitor abnormal
heating accident due to high-frequency waves. Therefore, never
install a phase advancing capacitor.
■
Follow the "electrical wiring diagram" when carrying out any
electrical wiring.
■
Always ground wires. (In accordance with national regulations of
the pertinent country.)
■
Do not connect the ground wire to gas pipes, sewage pipes,
lightning rods, or telephone ground wires.
■
Combustion gas pipes: can explode or catch fire if there is a
gas leak.
■
Sewage pipes: no grounding effect is possible if hard plastic
piping is used.
■
Telephone ground wires and lightning rods: dangerous when
struck by lightning due to abnormal rise in electrical potential
in the grounding.
■
This unit uses an inverter, and therefore generates noise, which
will have to be reduced to avoid interfering with other devices.
The outer casing of the product may take on an electrical charge
due to leaked electrical current, which will have to be discharged
with the grounding.
■
For Y1 models only: Make sure to connect power supply cables
in normal phase. If connected in reverse phase, the remote
controller of the indoor unit indicates
"
U1
"
and the equipment
cannot operate. Change any two of the three power supply
cables (L1, L2, L3) to correct phase. (Refer to the installation
manual of the indoor unit for more details.)
■
A main switch or other means for disconnection having a contact
separation in all poles, shall be incorporated in the fixed wiring in
accordance with relevant local and national regulations.
Filling using a cylinder
with a siphon attached
Charge the liquid refrigerant
with the cylinder in upright
position.
Filling using a cylinder
without a siphon attached
Charge the liquid refrigerant
with the cylinder in up-side-
down position.
1
Liquid line stop valve
2
Gas line stop valve
3
To indoor unit
4
Valve A
5
R410A tank
6
Measuring instrument
7
Pipe fixing plate
To avoid compressor breakdown. Do not charge the
refrigerant more than the specified amount.
3
5
6
1 2
4
3
5
6
1 2
7
4
V1
Y1
All field wiring and components must be installed by a
licensed electrician and must comply with relevant
European and national regulations.
To persons in charge of electrical wiring work:
Do not operate the unit until the refrigerant piping is
complete. (Running it before the piping is ready will break
the compressor.)
