Installation manual
18
ERX125~250A7W1B
Inverter condensing unit
4PW30064-1D
13. S
ERVICE
MODE
OPERATION
Vacuuming method
At the first installation, this vacuuming is not required. It is required
only for repair purposes.
1
When the unit is at standstill and under the setting mode 2, set
the required function B (refrigerant recovery operation/
vacuuming operation) to
(ON).
-
After this is set, do not reset the setting mode 2 until the
vacuuming is finished.
-
The H1P LED is on and the standard remote controller
indicates
(test operation) and
(external control)
and the operation will be prohibited (when a standard remote
controller is connected).
2
Evacuate the system with a vacuum pump.
3
Press the
button and reset the setting mode 2.
Refrigerant recovery operation method
by a refrigerant reclaimer
1
When the unit is at standstill and under the setting mode 2, set the
required function B (refrigerant recovery operation/vacuuming
operation) to
(ON).
-
The expansion valves (on control box and outdoor unit) will
fully open and some solenoid valves will be turned on.
-
The H1P LED is on and the remote controller indicates
(test operation) and
(external control) and the
operation will be prohibited.
2
Cut off the power supply to all connected units and the outdoor
unit with the circuit breaker. After the power supply to one side is
cut off, cut off the power supply to the other side within 10
minutes. Otherwise, the communication between the indoor and
outdoor unit may become abnormal and the expansion valves
will be completely closed again.
3
Recover the refrigerant by a refrigerant reclaimer. For details,
see the operation manual supplied with the refrigerant reclaimer.
14. C
AUTION
FOR
REFRIGERANT
LEAKS
(Points to note in connection with refrigerant leaks.)
14.1. Introduction
The installer and system specialist shall secure safety against
leakage according to local regulations or standards. The
following standards may be applicable if local regulations are
not available.
This unit, like other air conditioning systems, uses R410A as
refrigerant. R410A itself is an entirely safe non-toxic, non-
combustible refrigerant. Nevertheless care must be taken to ensure
that air conditioning facilities are installed in a room which is
sufficiently large. This assures that the maximum concentration level
of refrigerant gas is not exceeded, in the unlikely event of major leak
in the system and this in accordance to the local applicable
regulations and standards.
14.2. Maximum concentration level
The maximum charge of refrigerant and the calculation of the
maximum concentration of refrigerant is directly related to the
humanly occupied space in to which it could leak.
The unit of measurement of the concentration is kg/m
3
(the weight in
kg of the refrigerant gas in 1 m
3
volume of the occupied space).
Compliance to the local applicable regulations and standards for the
maximum allowable concentration level is required.
According to the appropriate European Standard, the maximum
allowed concentration level of refrigerant to a humanly space for
R410A is limited to 0.44 kg/m
3
.
Pay special attention to places, such as a basements, etc. where
refrigerant can stay, since refrigerant is heavier than air.
14.3. Procedure for checking maximum
concentration
Check the maximum concentration level in accordance with steps 1
to 4 below and take whatever action is necessary to comply.
1
Calculate the amount of refrigerant (kg) charged to each system
separately.
ON
BS1 MODE
ON
amount of refrigerant
in a single unit
system (amount of
refrigerant with
which the system is
charged before
leaving the factory)
+
additional charging
amount (amount of
refrigerant added
locally in accordance
with the length or
diameter of the
refrigerant piping)
=
total amount of
refrigerant (kg)
in the system
NOTE
Where a single refrigerant facility is divided into
2 entirely independent refrigerant systems, use
the amount of refrigerant with which each
separate system is charged.
