Daikin R-410A Installation Manual page 58

Installation
Cautions for normal operation check:
Once stopped, the compressor cannot restart in about 5
•
minutes even if the On/Off button of an indoor unit in the
same system is pressed.
When the system operation is stopped by the remote con-
•
trol, the outdoor units may continue to operate for a further
5 minutes.
If the system has not undergone any check operation by
•
the test operation button since it was first installed, an error
code "U3" is displayed. In this case, perform check opera-
tion referring to 8-2 Test Operation.
After the test operation, when handing the unit over to the
•
customer, make sure the electric box lid, the service lid,
and the unit casing are all attached.
10.4 CAUTION FOR REFRIGERANT LEAKS
DANGER
Refrigerant gas is heavier than air and replaces oxygen. A
•
massive leak could lead to oxygen depletion, especially in
basements, and an asphyxiation hazard could occur lead-
ing to serious injury or death.
CHECKING FOR REFRIGERANT LEAKS IS MANDATORY
The installer must be properly trained in safety requirements
and procedures for handling and working with R-410A. The
installer must prevent leakage according to local regulations
or standards.
The VRV System uses R-410A as refrigerant. R-410A itself is
an entirely safe, non-toxic, non-combustible refrigerant
Compliance with local regulations and standards must be fol-
lowed in order to ensure that the maximum concentration level
of refrigerant gas is not exceeded, and care must be taken to
ensure that equipment is installed in a large enough room.
Maximum concentration level
The maximum concentration and charge of refrigerant is
directly related to the occupied space in which it could leak.
The unit of measurement of the concentration is lb./ft
weight in lbs of the refrigerant gas is 1ft
pied space.
direction of the refrigerant flow
1.
room where refrigerant leak has occurred depicting
2.
outflow of all the refrigerant from the system.
Pay special attention to the types of places, such basements
or other areas with limited ventilation, where refrigerant can
57
3
and the
3
volume of the occu-
be trapped. Refrigerant is heavier than air and replaces oxy-
gen. See Danger caption on Page 19.
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 (Ib.) charged to each
system separately.
amount of refriger- additional charging
+
ant in a single unit amount (amount of
system (amount of refrigerant added
refrigerant with locally in accordance
which the system with the length or
is charged before diameter of the refrig-
leaving the factory) erant piping)
NOTE
Where a single refrigerant facility is divided into 2 entirely
•
independent refrigerant systems, use the amount of refrig-
erant with which each separate system is charged.
EDUS39-605
total amount
=
of refriger-
ant (Ib.) in
the system
Installation of Outdoor Units