10T7Y1B
VRV-W IV System Air Conditioner
4P347465-1A – 2013.04
Installation and operation manual
33
Heat recovery system (3-pipe)
1
Pressure reducing valve
2
Nitrogen
3
Charge hose
4
Refrigerant R410A tank (siphon system)
5
Measuring instrument
6
Vacuum pump
7
Outdoor unit
8
Gas line stop valve
9
Liquid line stop valve (in case of heat pump system): HP/
LP
10
HP/LP gas line stop valve
11
Suction gas line stop valve (in case of heat recovery
system)
12
Stop valve service port (in case of heat recovery system)
13
To indoor unit
14
To indoor unit/BS unit
15
Field piping
A
Valve A
B
Valve B
C
Valve C
D
Valve D
B. Additional refrigerant charge procedure by additional
refrigerant charge operation
Refer to
page 35
for more information about the system settings for
additional refrigerant charge operation.
1
Turn on the power supply of the system (indoor and outdoor
unit(s)).
2
Make sure the pump is operational and water circulation is
possible.
3
Open the valves in accordance with the below table.
4
After ten minutes, fully close the liquid line stop valve C and
then, open valve C by turning it open 180° only (do not turn it
open fully).
5
Start the additional refrigerant charge operation, setting [2-20]=
ON.
If it is difficult to charge the refrigerant additionally, decrease the
water temperature or warm the refrigerant tank.
(Warm the refrigerant tank with hot water of maximum 40°C.)
6
After the system is charged with a specified amount of
refrigerant, press the RETURN button (BS3) on the PC board
(A1P) in the outdoor unit to stop the additional refrigerant charge
operation.
7
After the refrigerant charge hose is removed, immediately fully
open the liquid-side stop valve C.
(Otherwise, liquid seal may cause the pipe to burst.)
Perform the test procedure as explained in
"18. Test operation" on
page 40
.
17. Start-up and configuration
17.1. Checks before initial start up
After the installation of the unit, first check the following items. Once
all below checks are fulfilled, the unit must be closed, only then can
the unit be powered up.
1
Installation
Check that the unit is properly installed, to avoid abnormal
noises and vibrations when starting up the unit.
2
Field wiring
Be sure that the field wiring has been carried out according to
the instructions described in the chapter
"14. Electrical wiring
work" on page 22
, according to the wiring diagrams and
according to the applicable legislation.
3
Power supply voltage
Check the power supply voltage on the local supply panel. The
voltage must correspond to the voltage on the identification label
of the unit.
4
Earth wiring
Be sure that the earth wires have been connected properly and
that the earth terminals are tightened.
5
Insulation test of the main power circuit
Using a megatester for 500 V, check that the insulation
resistance of 2 M
Ω
or more is attained by applying a voltage of
500 V DC between power terminals and earth. Never use the
megatester for the transmission wiring.
6
Fuses, circuit breakers, or protection devices
Check that the fuses, circuit breakers, or the locally installed
protection devices are of the size and type specified in the
chapter
"14. Electrical wiring work" on page 22
. Be sure that
neither a fuse nor a protection device has been bypassed.
Which valves?
State of valves
State of valves A, B, C and D and
stop valves
Valve A
Open
Valve B
Closed
Valve C
Open
Valve D
Closed
Liquid stop valve
Open
Suction gas stop valve
Open
(a)
(a) In case of heat recovery system only! In case of heat pump system, this
valve always stays closed!
HP/LP stop valve
Open
1
2
4
5
R410A
10
6
7
7
14
9
11
12
15
A
B
C
D
INFORMATION
The additional refrigerant charge operation will
automatically stop after 30 minutes.
If charging is not completed after 30 minutes, perform the
additional charging procedure again.
NOTICE
If the additional refrigerant charge operation stops
immediately, there is a possibility that the unit was
overcharged. In such a case, check the refrigerant volume
again.
NOTICE
Make sure to open all stop valves after charging
refrigerant.
INFORMATION
It is important that all information in this chapter is read
sequentially by the installer and that the system is
configured as applicable.
DANGER: Electrical shock
See
"2. General safety precautions" on page 2
.
4P347465-1A.book Page 33 Monday, August 5, 2013 2:26 PM