Service Mode Operation; Caution For Refrigerant Leaks; Introduction; Maximum Concentration Level - Panasonic U-5ML5DPQ Installation Manual

13. S
ERVICE MODE OPERATION
After turning on the power supply, the unit can not be started until the
H2P initialisation led, indicating that the unit is still under preparation,
goes off (maximum 12 minutes).
Vacuuming method
At the first installation, this vacuuming is not required. It is required
only for repair purposes.
1 When the unit is at a 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 remote controller indicates
(test operation) and
operation will be prohibited.
2 Vacuum the system with a vacuum pump.
3 Press the button and reset the setting mode 2.
BS1 MODE
Refrigerant recovery operation method by a refrigerant
reclaimer.
1 When the unit is at a standstill and in setting mode 2, set the
required function B (refrigerant recovery operation/vacuuming
operation) to (ON).
ON
- The indoor unit and the outdoor unit expansion valves will
fully open and some solenoid valves will open.
- The H1P led is on and the remote controller indicates
(test operation) and
operation will be prohibited.
2 Recover the refrigerant using a refrigerant reclaimer. For details,
see the operation manual delivered with the refrigerant
reclaimer.
3 Press the button and reset the setting mode 2.
BS1 MODE
CAUTION
Never turn the power of the outdoor unit OFF while the
refrigerant is being recovered.
If the power is turned OFF, the solenoid valves are closed
and the refrigerant cannot be recovered from the outdoor
unit.
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.
The Urban Multi System, 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.
U-4~6ML5DPQ + U-4~6ML5XPQ
Urban Multi air conditioner
4PW40731-1
(ON).
(external control) and the
(external control) and the

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
kg of the refrigerant gas in 1 m
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
3
R410A is limited to 0.44 kg/m .
1 direction of the refrigerant flow
2 room where refrigerant leak has occurred (outflow of all the
refrigerant from the system)
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.
+
amount of refrigerant additional charging
in a single unit amount (amount of
system (amount of refrigerant added
refrigerant with locally in accordance
which the system is with the length or
charged before diameter of the
leaving the factory) refrigerant piping)
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.
3
(the weight in
volume of the occupied space).
1
2
=
total amount of
refrigerant (kg)
in the system
Installation manual
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