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17.3. Service mode operation
Refrigerant recovery operation/vacuuming operation is possible by
applying setting [2-21]. Refer to 13.2. Operating the push buttons and
DIP switches on the printed circuit board on page 24 for details how to
set mode 2.
When vacuuming/recovery mode is used, check very carefully what
should be vacuumed/recovered before starting. See installation manual
of the indoor unit for more information about vacuuming and recovery.
17.3.1.
Vacuuming method
1 When the unit is at standstill, set the unit in [2-21]=1.
2 When confirmed, the indoor units and outdoor unit expan-
sion valves will fully open. At that moment the segment display
01
indication=
and the user interface of all indoor units indicate
CENTRAL
"Test Operation" and
CONTROL
ited.
3 Evacuate the system with a vacuum pump.
4 Press BS3 to stop vacuuming mode.
17.3.2.
Refrigerant recovery operation method
This should be done by a refrigerant recovery equipment. Follow the
same procedure as for vacuuming method.
18. Caution for refrigerant leaks
18.1. 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 VRV 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 con-
ditioning facilities are installed in a room that 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.
Maximum concentration level
The maximum charge of refrigerant and the calculation of the maxi-
mum 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 lbs./ft.
weight in lbs. (kg) of the refrigerant gas in 1 ft.
occupied space).
Compliance to the local applicable regulations and standards for the
maximum allowable concentration level is required.
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 basements etc., where
refrigerant could stay, since refrigerant is heavier than air.
45
and the operation will be prohib-
(kg/m
) (the
3
3
(1 m
) volume of the
3
3
1
2
Procedure for checking maximum concentration
Check the maximum concentration level in accordance with steps 1 to
2 below and take whatever action necessary to comply.
1 Calculate the amount of refrigerant (lbs. (kg)) charged to each
system separately.
Amount of refrigerant
Additional charging
in a single unit system
amount (amount of re-
+
(amount of refrigerant
frigerant added locally
with which the system
in accordance with the
is charged before leav-
length or diameter of
ing the factory)
the refrigerant 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 Follow local code requirements (ASHRAE-15 2007 & ASHRAE-34
2007).
19. Disposal requirements
Dismantling of the unit, treatment of the refrigerant, of oil and of other
parts must be done in accordance with relevant local and national
legislation.
Total amount
=
of refrigerant
(lbs. (kg)) in
the system
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