Victa VFU-18A309I User manual

Indoor Unit
Outdoor Unit
DC Inverter
Duct Type Unit
Thank you for choosing these Air Conditioners, please read this owner’s manual carefully
before operation and retain it for future reference.
VFU-18A309I VFU-18A309O
VFU-24A309IVFU-24A309O
VFU-36A309I VFU-36A309O
VFU-48A309IVFU-48A309O
VFU-60A309I VFU-60A309O

Contents
1 Safety Precautions................................................................1
2 Outline of the Unit and Main Parts ........................................2
3 Preparative for Installation ....................................................3
3.1 Standard Accessory Parts ................................................... 3
3.2 Selection of the Installation Location..................................... 4
3.3 Connection Pipe Requirement ............................................. 6
3.4 Electrical Requirement ........................................................ 6
4 Installation of the Unit............................................................7
4.1 Installation of the Indoor Unit................................................... 7
4.2 Installation of the Outdoor Unit.............................................. 11
4.3 Installation of the Connection Pipe........................................ 12
4.4 Vacuum and Gas Leakage Inspection................................... 16
4.5 Installation of the Drain Hose ................................................ 18
4.6 Installation of the Duct........................................................... 22
4.7 Electrical Wiring .................................................................... 24
5 Installation of Controllers.....................................................29
6 Test Running.......................................................................29
6.1 Trial Operation and Testing ................................................ 29
6.2 Working Temperature Range.............................................. 31
7 Unit Function.......................................................................32
7.1 Setting of Double Indoor Room Sensors .............................. 32
7.2 Checking of Outdoor Ambient Temperature ......................... 32
7.3 Fresh Air Control ............................................................... 33
8 Troubleshooting and Maintenance......................................33
8.1 Troubleshooting................................................................. 33
8.2 Routine Maintenance ......................................................... 34

DC Inverter Duct Type Unit
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1 Safety Precautions
WARNING!
This mark indicates procedures which, if improperly performed, might
lead to the death or serious injury of the user.
CAUTION!
This mark indicates procedures which, if improperly performed, might
possibly result in personal harm to the user, or damage to property.
WARNING!
(1). For operating the air conditioner pleasantly, install it as outlined in this installation manual.
(2). Connect the indoor unit and outdoor unit with the room air conditioner piping and cord available
from our standard parts. This installation manual describes the correct connections using the
installation set available from our standard parts.
(3). Installation work must be performed in accordance with national wiring standards by authorized
personnel only.
(4). If refrigerant leaks while work is being carried out, ventilate the area. If the refrigerant comes in
contact with a flame, it produces toxic gas.
(5). Do not power on until all installation work is complete.
(6). During installation, make sure that the refrigerant pipe is attached firmly before you run the
compressor.
Do not operate the compressor under the condition of refrigerant piping not attached
properly with 2-way or 3-way valve open.
This may cause abnormal pressure in the refrigeration cycle that leads to breakage and
even injury.
(7). During the pump-down operation, make sure that the compressor is turned off before you
remove the refrigerant piping.
Do not remove the connection pipe while the compressor is in operation with 2-way or
3-way valve open.
This may cause abnormal pressure in the refrigerant cycle that leads to breakage and even
injury.
(8). When installing and relocating the air conditioner, do not mix gases other than the specified
refrigerant (R410A) to enter the refrigerant cycle.
If air or other gas enters the refrigerant cycle, the pressure inside the cycle will rise to an
abnormally high value and cause breakage, injury, etc.
(9). This appliance is not intended for use by persons (including children) with reduced physical,
sensory or mental capabilities, or lack of experience and knowledge, unless they have been
given supervision or instruction concerning use of the appliance by a person responsible for
their safety.
(10). Children should be supervised to ensure that they do not play with the appliance.
(11). If the supply cord is damaged, it must be replaced by the manufacturer, its service agent or
similarly qualified persons in order to avoid a hazard.

DC Inverter Duct Type Unit
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2 Outline of the Unit and Main Parts
Fig. 2.1
NOTE!
①. The connection pipe and duct for this unit should be prepared by the user.
②. The unit is standard equipped with rectangular duct.

DC Inverter Duct Type Unit
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3 Preparative for Installation
3.1 Standard Accessory Parts
The standard accessory parts listed below are furnished and should be used as
required.
Table 3.1
Indoor Unit Accessories
No.
Name
Appearance
Q'ty
Usage
1
Wired Controller
1
To control the indoor unit
2
Hanger
or
4
To fix the indoor unit
3
Nut with Washer
8
To fix the hook on the
cabinet of the unit.
4
Nut with Washer
4
To fix the hook on the
cabinet of the unit.
5
Nut
4
To be used together with
the hanger bolt for
installing the unit.
6
Washer
4
To be used together with
the hanger bolt for
installing the unit.
7
Insulation
1
To insulate the gas pipe
8
Insulation
1
To insulate the liquid pipe
9
Fastener
4
To fasten the sponge
10
Nut
1
To connect liquid pipe
11
Nut
1
To connect gas pipe

DC Inverter Duct Type Unit
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Table 3.2
Outdoor Unit Accessories
No.
Name
Appearance
Q'ty
Usage
1
Drain Plug
2 or3
To plug the unused drain
hole.
2
Drainage Connecter
or
1
To connect with the hard
PVC drain pipe
3.2 Selection of the Installation Location
WARNING!
The unit must be installed where strong enough to withstand the weight of the unit and fixed
securely, otherwise the unit would topple or fall off.
CAUTION!
①. Do not install where there is a danger of combustible gas leakage.
②. Do not install the unit near heat source, steam, or flammable gas.
③. Children under 10 years old must be supervised not to operate the unit.
Decide the installation location with the customer as follows:
3.2.1 Indoor Unit
(1). Install the unit at a place where is strong enough to withstand the weight of
the unit.
(2). The air inlet and outlet of the unit should never be clogged so that the
airflow can reach every corner of the room.
(3). Leave service space around the unit as required in Fig. 3.1.
Fig. 3.1

DC Inverter Duct Type Unit
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(4). Install the unit where the drain pipe can be easily installed.
(5). The space from the unit to the ceiling should be kept as much as possible
so as for more convenient service.
3.2.2 Outdoor Unit
WARNING!
①. Install the unit where it will not be tilted by more than 5°.
②. During installation, if the outdoor unit has to be exposed to strong wind, it must be fixed
securely.
(1). If possible, do not install the unit where it will be exposed to direct sunlight.
(If necessary, install a blind that does not interfere with the air flow.)
(2). Install the outdoor unit in a place where it will be free from getting dirty or
getting wet by rain as much as possible.
(3). Install the outdoor unit where it is convenient to connect the indoor unit.
(4). Install the outdoor unit where the condensate water can be drained out
freely during heating operation. Do not place animals and plants in the path
of the warm air.
(5). Take the air conditioner weight into account and select a place where noise
and vibration are small.
(6). Install the outdoor unit where is capable of withstanding the weight of the
unit and generates as less noise and vibration as possible.
(7). Provide the space shown in Fig. 3.2, so that the air flow is not blocked. Also
for efficient operation, leave three of four directions of peripheral
constructions open.
Fig. 3.2

DC Inverter Duct Type Unit
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3.3 Connection Pipe Requirement
CAUTION!
The maximum length of the connection pipe is listed in the Table below. Do not place the units
between which the distance exceeds the maximum length of the connection pipe.
Table 3.3
Item
Model
Size of Fitting
Pipe(Inch)
Max.
Pipe
Length
(m)
Max. Height
Difference between
Indoor Unit and
Outdoor Unit (m)
Drainage
pipe(Outer
Diameter × wall
thickness)(mm)
Liquid
Gas
VFU-18A309I
VFU-18A309O
1/4
1/2
20
15
Φ30X1.5
VFU-24A309I
VFU- 24A309O
3/8
5/8
30
15
Φ20X1.2
VFU-36A309I
VFU- 36A309O
3/8
5/8
30
15
Φ20X1.2
VFU-48A309I
VFU-48A309O 3/8
5/8
50
30
Φ20X1.2
VFU-60A309I
VFU- 60A309O 3/8
3/4
50
30
Φ20X1.2
Notes:
①. The connection pipe should be insulated with proper water-proof insulating material.
②. The pipe wall thickness shall be 0.5-1.0 mm and the pipe wall shall be able to withstand
the pressure of 6.0MPa. The longer the connecting pipe, the lower the cooling and
heating effect performs.
3.4 Electrical Requirement
Electric Wire Size and Fuse Capacity.
Table 3.4
Indoor Units
Power Supply
Fuse Capacity
Breaker
Capacity
Min. Power Supply
Cord
V/Ph/Hz
A
A
mm2
18K~60K
220-240V~ 60Hz
5
6
1.0
Table 3.5
Model
Power
Supply
Capability of Air
Switch(A)
Minimum Sectional Area
Of Earth Wire (mm2)
VFU-18A309O
220-240V
～60Hz
16
1.5
VFU-24A309O
20
2.5
VFU-36A309O
25
2.5
VFU-48A309O
40
6.0
VFU-60A309O
40
6.0

DC Inverter Duct Type Unit
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Notes:
①. The fuse is located on the main board.
②. Install the disconnect device with a contact gap of at least 3 mm in all poles
nearby the units (Both indoor unit and outdoor unit).The appliance must be
positioned so that the plug is accessible.
③. The specifications of the breaker and power cable listed in the Table above
are determined based on the maximum power (maximum amps) of the unit.
④. The specifications of the power cable listed in the Table above are applied
to the conduit-guarded multi-wire copper cable (like, YJV copper cable,
consisting of PE insulated wires and a PVC cable jacket) used at 40°С and
resistible to 90°С(see IEC 60364-5-52). If the working condition changes,
they should be modified according to the related national standard.
⑤. The specifications of the breaker listed in the Table above are applied to
the breaker with the working temperature at 40°С. If the working condition
changes, they should be modified according to the related national
standard.
⑥. Take 2 pieces of power cord of 0.75mm2as the communication lines
between indoor and outdoor unit, with their longest lengths of 50m. Please
select the appropriate line length as per the actual installation conditions.
The communication lines can not be twisted together. For the unit (≤30K),
it’s recommended to use 8m long communication line.
⑦. Take 2 pieces of power cord of 0.75mm2as the communication lines
between the wired controller and the indoor unit, with their longest lengths
of 30m. Please select the appropriate line length as per the actual
installation conditions. The communication lines can not be twisted
together. It’s recommended to use 8m long communication line.
⑧. The wire size of the communication line should be no less than 0.75mm2.
It’s recommended to take 0.75mm2power cords as the communication line.
4 Installation of the Unit
4.1 Installation of the Indoor Unit
4.1.1 Indoor unit dimension

DC Inverter Duct Type Unit
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WARNING!
①. Install the indoor unit in a location which can withstand a load of at least five times the weight of
the main unit and which will not amplify sound or vibration.
②. If the installation location is not strong enough, the indoor unit may fall and cause injuries.
③. If the job is done with the panel frame only, there is a risk that the unit will come loose. Please
take care.
For the units: 18K
For the units: 24K、36K

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For the units: 48K、60K
Fig. 4.1
Table 4.1
Item
Model
A
B
C
D
E
F
G
H
I
J
VFU-18A309I
945
618
738
892
1037
721
738
125
203
266
VFU-24A309I
1101
517
820
1159
1279
558
1002
160
235
268
VFU-36A309I
1011
748
820
1115
1226
775
979
160
231
290
VFU-48A309I
1177
646
852
1150
1340
750
953
190
316
350
VFU-60A309I
1177
646
852
1150
1340
750
953
190
316
350
4.1.2 Drilling Holes for Bolts and Installing the Bolts
Using the installation template, drill holes for bolts (four holes). (Fig. 4.2)
4.1.3 Installing the Suspension Bolts
(1). Install the bolts to the ceiling at a place strong enough to hang the unit.
Mark the bolt positions from the installation template. With a concrete drill,
drill for 12.7 mm (1/2”) diameter holes. (Fig. 4.3)
(2). Insert the anchor bolts into the drilled holes, and drive the pins completely
into the anchor bolts with a hammer. (Fig. 4.4)
(3). Install the hanger to the unit. (Fig. 4.5)
(4). Pass the unit hangers over the bolts installed to the ceiling and install the
unit with the special nut.( Fig. 4.6)

DC Inverter Duct Type Unit
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Fig. 4.2 Fig. 4.3 Fig. 4.4
Fig. 4.5
Fig. 4.6
4.1.4 Leveling
The water level test must be done after installing the indoor unit to make the unit
is horizontal, as shown below.
Fig. 4.7

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4.2 Installation of the Outdoor Unit
WARNING
①. Install the unit where it will not be tilted by more than 5°.
②. During installation, if the outdoor unit has to be exposed to strong wind, it must be fixed securely.
4.2.1 Outdoor unit dimension
Fig. 4.8
Table 4.2 Unit: mm
Item
Model
A
B
C
D
E
VFU-18A309O
955
396
700
560
360
VFU-24A309O
980
427
790
610
395
VFU-36A309O
1107
440
1100
631
400
VFU-48A309O
958
412
1349
572
376
VFU-60A309O
1085
427
1365
620
395
4.2.2 Condensate Drainage of the Outdoor Unit (Only for the
heat pump unit) (Fig. 4.9)
(1). It is required to install a drain pipe for the outdoor unit to drain out the
condensate water during heating operation. (only for the heat pump unit)
(2). When installing the drain pipe, apart from the drain pipe mounting hole, all
other holes should be plugged so as to avoid water leakage.(only for the
heat pump unit)
(3). Installation Method: Insert the pipe joint into the hole φ25 located at the
base plate of the unit and then connect the drain pipe to the pipe joint.

DC Inverter Duct Type Unit
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Fig. 4.9
4.3 Installation of the Connection Pipe
4.3.1 Flare Processing
(1). Cut the connection pipe with the pipe cutter and remove the burrs.
(2). Hold the pipe downward to prevent cuttings from entering the pipe.
(3). Remove the flare nuts at the stop valve of the outdoor unit and inside the
accessory bag of the indoor unit, then insert them to the connection pipe,
after that, flare the connection pipe with a flaring tool.
(4). Check if the flare part is spread evenly and there are no cracks (see Fig.
4.10).
Fig. 4.10
4.3.2 Bending Pipes
(1). The pipes are shaped by your hands. Be careful not to collapse them.
Fig. 4.11
(1). Do not bend the pipes in an angle more than 90°.
(2). When pipes are repeatedly bent or stretched, the material will harden,

DC Inverter Duct Type Unit
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making it difficult to bend or stretch them any more. Do not bend or stretch
the pipes more than three times.
(3). When bending the pipe, do not bend it as is.
The pipe will be collapsed. In this case, cut the
heat insulating pipe with a sharp cutter as
shown in Fig. 4.12, and bend it after exposing
the pipe. After bending the pipe as you want,
be sure to put the heat insulating pipe back on
the pipe, and secure it with tape.
Fig. 4.12
CAUTION!
①. To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of curvature of
150 mm or over.
②. If the pipe is bent repeatedly at the same place, it will break.
4.3.3 Connecting the Pipe at the Indoor Unit Side
Detach the caps and plugs from the pipes.
CAUTION!
①. Be sure to apply the pipe against the port on the indoor unit correctly. If the centering is
improper, the flare nut cannot be tightened smoothly. If the flare nut is forced to turn, the threads
will be damaged.
②. Do not remove the flare nut until the connection pipe is to be connected so as to prevent dust
and impurities from coming into the pipe system.
Centering the pipe against port on the indoor unit, turn the flare nut with your hand.
CAUTION!
Hold the torque wrench at its grip, keeping it in the right angle with the pipe as shown in Fig.
4.13, in order to tighten the flare nut correctly.
When the flare nut is tightened properly by your hand, use a torque wrench to
finally tighten it.
Fig. 4.13

DC Inverter Duct Type Unit
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Fig. 4.14
Table 4.3 Flare nut tightening torque
Pipe Diameter
Tightening Torque
1/4 Inch）
15-30 (N·m)
3/8 Inch）
35-40 (N·m)
5/8 Inch）
60-65 (N·m)
1/2 Inch）
45-50 (N·m)
3/4 Inch）
70-75 (N·m)
7/8 Inch）
80-85 (N·m)
CAUTION!
Be sure to connect the gas pipe after connecting the liquid pipe completely.
4.3.4 Connecting the Pipe at the Outdoor Side Unit
Tighten the flare nut of the
connection pipe at the outdoor unit valve
connector. The tightening method is the
same as that as at the indoor side.
Fig. 4.15
4.3.5 Checking the Pipe Connections for Gas Leaking
For both indoor and outdoor unit side, check the joints for gas leaking by the use
of a gas leakage detector without fail when the pipes are connected.
4.3.6 Heat Insulation on the Pipe Joints (Indoor Side Only)
Stick coupler heat insulation (large and small) to the place where connecting
pipes.

DC Inverter Duct Type Unit
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Fig. 4.16
4.3.7 Liquid Pipe and Drain Pipe
(1). If the outdoor unit is installed lower than
the indoor unit (See Fig. 4.17)
1). A drain pipe should be above ground and
the end of the pipe does not dip into
water. All pipes must be restrained to the
wall by saddles.
2). Taping pipes must be done from bottom
to top.
3). All pipes are bound together by tape and
restrained to wall by saddles.
Fig. 4.17
(2). If the outdoor unit is installed higher than
the indoor unit (See Fig. 4.18)
1). Taping should be done from lower to the
upper part.
2). All pipes are bound and taped together
and also should be trapped to prevent
water from returning to the room.
3). Restraint all pipes to the wall with
saddles.
Fig. 4.18

DC Inverter Duct Type Unit
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4.4 Vacuum and Gas Leakage Inspection
CAUTION!
Do not purge the air with refrigerants but use a vacuum pump to vacuum the installation! There
is no extra refrigerant in the outdoor unit for air purging!
4.4.1 Vacuum
(1). Remove the caps of the liquid valve, gas valve and also the service port.
(2). Connect the hose at the low pressure side of the manifold valve assembly
to the service port of the unit’s gas valve, and meanwhile the gas and liquid
valves should be kept closed in case of refrigerant leak.
(3). Connect the hose used for evacuation to the vacuum pump.
(4). Open the switch at the lower pressure side of the manifold valve assembly
and start the vacuum pump. Meanwhile, the switch at the high pressure
side of the manifold valve assembly should be kept closed, otherwise
evacuation would fail.
(5). The evacuation duration depends on the unit’s capacity, generally, 20
minutes for the 18K units, 30 minutes for the 24/36K units, 45 minutes for
the 48/60K units. And verify if the pressure gauge at the low pressure side
of the manifold valve assembly reads -1.0Mp (-75cmHg), if not, it indicates
there is leak somewhere. Then, close the switch fully and then stop the
vacuum pump.
(6). Wait for some time to see if the system pressure can remain unchanged, 3
minutes for the units less than 18K, 5 minutes for the 18K/24K units, 10
minutes for the 36~60K units. During this time, the reading of the pressure
gauge at the low pressure side can not be larger than 0.005Mp
(0.38cmHg).
(7). Slightly open the liquid valve and let some refrigerant go to the connection
pipe to balance the pressure inside and outside of the connection pipe, so
that air will not come into the connection pipe when removing the hose.
Note that the gas and liquid valve can be opened fully only after the
manifold valve assembly is removed.
(8). Place back the caps of the liquid valve, gas valve and also the service port.

DC Inverter Duct Type Unit
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Fig. 4.19
Note: For the large-sized unit, it has the service port for both the gas valve and the liquid valve.
During evacuation, it is available to connect two hoses of the manifold valve assembly to two
service ports to quicken the evacuating speed.
4.4.2 Additional Charge
18K~36K: Refrigerant suitable for a piping length of 5m is charged in the
outdoor unit at the factory. When the piping is longer than 7m, additional charging is
necessary.
48/60K: Refrigerant suitable for a piping length of 7.5m is charged in the outdoor
unit at the factory. When the piping is longer than 10 m, additional charging is
necessary.
For the additional amount, see Table 4.4.
Table 4.4
Item
Model
Additional Refrigerant
Amount for Extra Pipe
18K
30g/m
24~60K
60 g/m

DC Inverter Duct Type Unit
18
When the height difference between
the indoor unit and outdoor unit is larger
than 10 meters, an oil bend should be
employed for every 6 meters.
Fig. 4.20
4.5 Installation of the Drain Hose
4.5.1 Installation of Drain Piping
CAUTION!
Install the drain hose in accordance with the instructions in this installation manual and keep
the area warm enough to prevent condensation. Problems with the piping may lead to water
leaks.
(1). Install the drain hose with downward gradient (1/50 to 1/100) and no risers
or traps are used for the hose.(Fig. 4.21)
(2). Be sure there is no crack or leak on the drain hose to avoid the formation of
air pocket.(Fig. 4.21)
(3). When the hose is long, install supporters.(Fig. 4.22)
(4). Always use the drain hose which has been insulated properly.
Fig. 4.21