17
PAW-VP•LDHW - Technical Manual – 2020-07
Safety Instructions
Check of Density Limit R32
U-200PZH2E8
The refrigerant (R32), which is used in the air conditioner, is a flammable refrigerant. So the
requirements for installation space of appliance are determined according to the refrigerant
charge amount [mc] used in the appliance.
The minimum indoor floor space compared with the amount of refrigerant is roughly as follows,
in the case it is installed in a habitable area with height factor 1.8:
PAW-VP380L must be calculated as a wall mounted unit.
450
400
350
300
250
200
150
100
50
0
1
3
5
7
9
11
13
For R410A please refer to installation manual for outdoor unit.
Check of Density Limit R410A
Check the amount of refrigerant in the system and floor space of the room according to the
legislation on refrigerant drainage. If there is no applicable legislation, follow the standards
described below.
The room in which the air conditioner is to be installed requires a design that in the event of
refrigerant gas leaking out, its density will not exceed a set limit.
The refrigerant (R410A), which is used in the air conditioner, is safe, without the toxicity or com-
bustibility of ammonia, and is not restricted by laws imposed to protect the ozone layer.
However, since it contains more than air, it poses the risk of suffocation if its density should
rise excessively. Suffocation from leakage of refrigerant is almost non-existent. With the recent
increase in the number of high density buildings, however, the installation of multi air conditioner
systems is on the increase because of the need for effective use of floor space, individual con
-
trol, energy conservation by curtailing heat and carrying power, etc.
Most importantly, the multi air conditioner system is able to replenish a large amount of refriger-
ant compared to conventional individual air conditioners. If a single unit of the multi air condition-
er system is to be installed in a small room, select a suitable model and installation procedure
so that if the refrigerant accidentally leaks out, its density does not reach the limit (and in the
event of an emergency, measures can be made before injury can occur).
A
min
[m²]
m
ref
[kg]
Factor 1.8
7.80 kg
Max. charge for
outdoor model
U-200PZH2E8
R32 max.
allowable
charge for
occupied
space
