Installation manual
11
ERQ100~140A7V1B
Inverter condensing unit
4PW51321-1
10.2. 2 procedures for adding refrigerant
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. After charging, the system will stop automatically. The
refrigerant must be charged according to the procedure described
below.
Procedure 1: Charging while the outdoor unit is at a standstill
See
1
Determine the weight of refrigerant to be charged additionally
referring to the item "Additional refrigerant charge" in
calculate the additional refrigerant to be charged" on page 10
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 of the outdoor unit, control box and air
handling units.
-
Check that gas and liquid stop valves are closed.
-
Stop the compressor and charge the specified weight of
refrigerant.
Procedure 2: Charging while the outdoor unit is operating
"How to connect the tank?" on page 11
1
Completely open the gas side stop valve and liquid side stop
valve. Valve A must be left fully closed.
2
Close the front panel and turn on the power to the control box,
air handling unit and the outdoor unit.
3
Open valve A immediately after starting of the compressor.
4
Charge the additional refrigerant in its liquid state through the
service port of the liquid line stop valve.
5
While the unit is at a standstill and under setting mode 2 (refer to
Checks before initial start-up
set the required function A (additional refrigerant charging
operation) to
(ON). Then operation starts. The blinking H2P
led indicates test operation and the remote controller indicates
(test operation) and
(external control).
6
When the specified amount of refrigerant is charged, push the
button. Then operation stops.
■
The operation automatically stops within 30 minutes.
■
If the refrigerant charge cannot be finished within 30 minutes,
repeat step
■
If the operation stops immediately after restart, there is a
possibility that the system is overcharged.
The refrigerant cannot be charged more than this amount.
7
After the refrigerant charge hose is removed, make sure to close
valve A.
11. E
LECTRICAL
WIRING
WORK
11.1. Internal wiring – Parts table
L............................. Live
N ............................ Neutral
........... Field wiring
.................... Terminal strip
......................... Connector
......................... Protective earth (screw)
.......................... Connection
....................... Relay connector
........................... Functional earthing
.......................... Terminal
......................... Movable connector
.......................... Fixed connector
BLU........................ Blue
BRN ....................... Brown
GRN....................... Green
RED ....................... Red
1
Liquid line stop valve
2
Gas line stop valve
3
To air handling unit
4
Service port for adding refrigerant
5
Valve A
6
R410A tank
7
Measuring instrument
8
Pipe fixing plate
■
To avoid compressor breakdown. Do not charge the
refrigerant more than the specified amount.
■
If the total refrigerant cannot be charged while the
outdoor unit is at a standstill, it is possible to charge
the refrigerant by operating the outdoor unit using the
refrigerant charge function (refer to
) and follow
the outdoor unit is operating" on page 11
3
6
7
1 2
4
5
■
All wiring must be performed by an authorized
electrician.
■
All field supplied components and all electric
construction should comply with the applicable local
and national codes.
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.)
ON
BS3 RETURN
