Caution For Refrigerant Leaks - Panasonic CU-8ME1XPK Installation Manual

How to operate stop valves (refer to figure 11)
1. To open
1. Remove the cap (1) and turn the shaft (2) counterclockwise with
hexagon socket screw keys (JIS B 4648 nominal size 6 mm and
10 mm).
2. Turn it all the way until the shaft stops.
3. Tighten the cap firmly.
2. To close
1. Remove the cap and turn the shaft clockwise.
2. Tighten the shaft firmly until it reaches the sealed area (4) of the
body.
3. Tighten the cap firmly.
Note
- Refer to the table at the end of this chapter for tightening torques
and dimensions of the flares.
- Be sure to use both, a spanner and a torque wrench, when
connecting or disconnecting pipes to or from the unit.
- When connecting a flare nut, apply ether or ester oil on the flare
area (both internal and external face), and screw it with your
hand a few times first.
- Use a charging hose with push rod when using the service
port(5).
- Check for refrigerant gas leakage after tightening the cap.
- Make sure to apply ether oil or ester oil around the flare portions
(both inner and outer face) when connecting flare nuts, and give
3 turns by hand before applying spanners.
- Make sure to keep stop valve open during operation.
FLARE SHAPE and FLARENUT TIGHTENING TORQUE
tightening
pipe size
torque (N·m)
Ø12.7 49.5~60.3
Ø19.1 97.2~118.6
Disposal requirements
Dismantling of the unit, treatment of the refrigerant, oil and
eventual other parts, should be done in accordance with the
relevant local and national regulations.
C
AUTION FOR REFRIGERANT LEAKS
(Points to note in connection with refrigerant leaks)
Introduction
The UM System, like other air conditioning systems, uses R407C
as refrigerant. R407C 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.
A (mm) flare shape
90° ±4
15.4~15.8
A
R=0.4~0.8
22.9~23.3
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
in kg of the refrigerant gas in 1m
Compliance to the local applicable regulations and standards for
the maximum allowable concentration level is required.
In Japan the maximum allowed concentration level of refrigerant to
a humanly space for R407C is limited to 0.3 kg/m
1. direction of the refrigerant flow
2. room where refrigerant leak has occurred (outflow of all the
refrigerant from the system)
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 sys- amount (amount of
tem (amount of re- refrigerant added lo-
frigerant with which cally in accordance
t h e s y s t e m i s with the length or di-
charged before leav- ameter of the refrig-
ing the factory) erant piping)
Note
• Where a single refrigerant facility is divided into 2 entirely
independent refrigerant systems then use the amount of
refrigerant with which each separate system is charged.
2. Calculate the smallest room volume (m
Incase like 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
3
( the weight
3 volume of the occupied space).
3 .
1
2
total amount of re-
=
frigerant (kg) in the
system
3 )
10