Caution For Refrigerant Leaks; Introduction; Maximum Concentration Level; Procedure For Checking Maximum Concentration - Panasonic URBAN MULTI Manuel D'installation

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.

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)
Installation manual
20
(external control) and the
3
(the weight in
volume of the occupied space).
1
2
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.
2 Calculate the smallest room volume (m
In a case such as the following, calculate the volume of (A), (B)
as a single room or as the smallest room.
A. Where there are no smaller room divisions
B. Where there is a room division but there is an
opening between the rooms sufficiently large to
permit a free flow of air back and forth.
1 opening between rooms
2 partition
(Where there is an opening without a door or where there
are openings above and below the door which are each
equivalent in size to 0.15% or more of the floor area.)
3 Calculating the refrigerant density using the results of the
calculations in steps 1 and 2 above.
total volume of
refrigerant in the
≤
refrigerant system
3
size (m ) of smallest
room in which there is
an indoor unit installed
If the result of the above calculation exceeds the maximum
concentration level then make similar calculations for the second
then third smallest room and so until the result falls short of the
maximum concentration.
4 Dealing with the situations where the result exceeds the
maximum concentration level.
Where the installation of a facility results in a concentration in
excess of the maximum concentration level then it will be
necessary to revise the system.
Please consult your supplier.
=
total amount of
refrigerant (kg)
in the system
3
)
1
2
3
maximum concentration level (kg/m
U-4~6ML4DPQ
Urban Multi air conditioner
4PW29037-1
)