VRF Air-Conditioner
Installation Manual
FORM NO.:YDVC IOM-EN(1212)
VRF Air-Conditioner IOM
VRF Air-Conditioner IOM
Contents
1. SAFETY CONSIDERATIONS ............................................................................................................ 1
2. BEFORE INSTALLATION ................................................................................................................ 1
3. SELECTING INSTALLATION SITE .................................................................................................... 2
4. INDOOR UNIT INSTALLTION ......................................................................................................... 2
5. REFRIGERANT PIPING WORK ....................................................................................................... 4
6. DRAIN PIPING WORK ................................................................................................................... 5
7. INSTALLING THE DUCT ................................................................................................................. 6
8. ELECTRIC WIRING WORK ............................................................................................................. 6
VRF Air-Conditioner IOM
1
1 SAFETY CONSIDERATIONS
Please read the “SAFETY CONSIDERATIONS” carefully
before installing the air-conditioner equipment and be
sure to install it correctly.
The below notes include two types, both of which are
related to safety and extremely important. Please read
it carefully.
WARNING Indicates a potentially
hazardous situation, which, if not avoided, could result
in death or serious injury.
CAUTION Indicates a situation that may
result in injury or equipment damage. According to
different conditions, it also may result in the accidents
of serious injury or other damage.
Ask the specially trained personnel to carry out
the installation work. Do not try to install the
machine by yourself.
Please perform the installation work in accordance
with the steps in this manual.
Improper installation may result in water leakage,
electric shock or fire.
Make sure that a separate power supply circuit is
provided for this unit and that all electrical work is
carried out by specially trained personnel
according local laws, regulations and this
installation manual.
An insufficient power supply capacity or improper
electrical construction may lead to electric shock
or fire.
Make sure that the specified wires that comply
with national standard are used and all wiring is
secure. No external forces act on the terminal
connections or wires.
Improper wiring connections or installation may
result in electric shock or fire.
When connecting the wiring of power supply,
wired controller and remote controller, the wiring
should be laid orderly so that the electric parts
box lid can be securely fastened.
If it appears refrigerant leakage during the
installation process, open the doors and windows
immediately to ventilate the room thoroughly.
Toxic gas may be produced if the refrigerant comes
in contact with fire such as a fan heater, stove or
cooking device.
Power off the unit before touching the electrical
parts.
Do not touch the switch with wet fingers.
Touching the switch with wet fingers may cause
electric shock.
Be sure the air-conditioner is well grounded.
Never connect the ground line with the gas pipe,
water pipe, lightning conductor or telephone lines.
Incomplete ground line may cause electric shock
or fire.
Be sure to install a ground leakage breaker.
Failure to install a ground leakage breaker may
result in electric shock or fire.
Please follow the instructions in this manual to
install drain pipe in order to ensure smooth
drainage and good piping insulation to avoid
accumulating of condensate water.
Improper drain pipe may result in water leakage
and property damage.
Install the air-conditioner unit, power supply
wiring and connection wires at least 1m away
from electrical equipments, such as TVs, radios,
etc. to avoid electromagnetic waves interference
or noise.
Remote controller transmitting distance may be
shortened than the expected one in the rooms
with electronic fluorescent lamps (inverter or
rapid start types).
Install the indoor unit as far away from fluorescent
lamps as possible.
Do not install the air-conditioner in the following
locations:
(a) Where a mineral oil mist or an oil spray or
vapor is produced, for example in a kitchen.
Plastic parts may be deteriorated, corroded or
damaged.
(b) Where corrosive gas, such as sulfurous acid
gas is produced.
Corroded copper tubes or soldered parts may
result in refrigerant leakage.
(c) Where near machinery emitting
electromagnetic waves.
Electromagnetic waves may disturb the
operation of the control system and result in a
malfunction of the equipment.
(d) Where it may have flammable gas leakage,
carboform or floating flammable dust,
volatile flammable material such as gasoline
or thinner.
Using air-conditioner in those places may
result in fire.
Do not touch heat exchanger fins
Improper touching the heat exchanger fins may
result in machine damage or personnel injury.
Be very careful about the product transportation.
Do not use any packaging PP bands for a means of
transportation to avoid PP bands rupturing and
result in product damaging or personnel injury.
2 BEFORE INSTALLATION
Do not unpack the unit before reaching the
installation site. Where unpacking is unavoidable,
countermeasure should be done after unpacking
WARNING
VRF Air-Conditioner IOM
2
to avoid damaging or scratching of the unit.
When moving the unit during or after unpacking,
be sure to avoid putting any pressure or strength
on the refrigerant piping, drain pipe or the other
plastic parts, which may damage the unit.
Before installing the unit, be sure to check the
type of refrigerant to be used is R22 or R410A
which should be same as outdoor unit.
For the installation of the outdoor unit, please
refer to the installation manual attached to the
outdoor unit.
3 SELECTING INSTALLATION SITE
If it has the possibility that the temperature and
humidity inside the ceiling might exceed 30°C and
RH80%, please reinforce the insulation on the
unit.
Use glass wool or polyethylene foam as insulation
and its thickness is more than 10mm.
3.1 INSTALLATION SITE REQUIREMENTS
The ceiling is strong enough to bear the indoor
unit weight. If not, please reinforce the ceiling
before installation.
Ensure optimum air distribution and nothing
blocks the air passage.
Condensate water can be drained out smoothly.
No risk of flammable gas leakage.
Ensure sufficient clearance for maintenance and
service. (Refer to Fig. 1)
Piping between indoor and outdoor units is within
the allowable limit.
Fig. 1 Clearance for Maintenance and Service
4 INDOOR UNIT INSTALLATION
4.1 Confirm the installation position
Refer to Fig. 2 to see the unit’s diameter and confirm the installation location.
NO
TE
CAUTION
VRF Air-Conditioner IOM
3
Fig. 2 Indoor Unit Dimension
Model
Dimension
(A)
Unit Dimension
(B)
Air Supply
(C)
Installation
Hole
(D)
Pipe Diameter (mm)
Liquid Pipe
Gas Pipe
YDVC028 730 570 532 513 6.35 9.52
YDVC045 980 820 782 763 6.35 12.7
YDVC056
1334
1170
1132
1113
6.35
12.7
YDVC071 1334 1170 1132 1113 9.52 15.88
To leave an inspection opening for convenient
maintenance and inspection of the parts such
as electrical parts, refrigerant connection nuts,
temperature sensors, EXV coil, drain pump (if it
has), etc. Refer to Fig. 3 for the inspection
opening size.
Figure 3 Servica Space
VRF Air-Conditioner IOM
4
4.2 Check if the unit is horizontally level
Make sure that the unit is installed level using a
spirit level or a plastic tube filled with water. (Refer
to Fig. 4)
(One thing to watch out for in particular is if the
unit is installed so that the slope is not in the
direction of the drain pipe, which might cause
condensate water leaking.)
Fig. 4 Check Unit Level
4.3 Install the suspension bolts
Shall ensure the unit being in horizontal level and
installed firmly. Install anchor bolt to fix unit
securely if necessary.
5 REFRIGERANT PIPING WORK
Execute insulation completely on both sides of the
gas piping and the liquid piping. Otherwise,
condensate water may be formed and dropped
down.
Please use the insulation materials that can
withstand temperature of at least 120°C. Reinforce
the insulation on the refrigerant piping according
to the installation environment. Otherwise,
condensate water may form on the surface of the
insulation.
Please follow the below items.
Apply ester oil or ether oil to the flare section
(internal and external surface) when using a flare
connection.
Only the flare nuts included with the unit can be
used. Using different flare nuts may cause
refrigerant leakage.
To prevent dust, moisture or other contaminant
from infiltrating the piping, either pinch the end or
cover it with tape.
Do not allow anything other than the designated
refrigerant to get mixed into the refrigerant circuit,
such as air, etc.
When brazing the refrigerant piping, perform
nitrogen replacement first, or perform brazing
while feeding nitrogen into the refrigerant piping,
and finally connect the indoor unit using the flare
connections.
When brazing a pipe while feeding nitrogen inside
the pipe, make sure to set the nitrogen pressure to
0.02MPa (0.2kgf/cm
2
) around.
Do not use flux when brazing refrigerant piping.
Therefore, use the phosphor copper brazing filler
metal (BCuP) which does not require flux.
If chlorine or fluoric based flux is used, it will cause
pipe corrosion and contamination of refrigerant oil
5.1 Connect the piping
Be sure to use both a spanner and torque wrench
together, as shown in Fig. 5, when connecting or
disconnecting pipes to/from the unit.
Fig. 5 Piping Connection
Refer to Table 1 for the tightening torque.
Table 1
Pipe Diameter
mm (inch)
Tightening Torque
(N m)
6.35 (1/4") 14 17
9.53 (3/8") 32.5 40
12.7 (1/2") 49.5 60
15.88 (5/8") 62 75
19.05 (3/4") 80 95
22.23 (7/8") 100 115
If no torque wrench is available, please follow the
below method to do the installation.
Using a wrench to tighten flare nuts causes the
tightening torque to suddenly grow much tighter
after a certain point. From that point, tighten the
nut further by the appropriate angle listed in Table
2.
Table 2
NO
TE
NO
TE
NO
TE
CAUTION
CAUTION
CAUTION
VRF Air-Conditioner IOM
5
Pipe Diameter
mm (inch)
Further
tightening angle
Recommended arm
length of toll
6.35(1/4") 60 90
150mm
9.53(3/8") 60 90
200mm
12.7(1/2") 45 75
250mm
15.88(5/8")
45 75
300mm
19.05(3/4")
30 60
400mm
22.23(7/8")
30 60
400mm
Over tightening may damage the flare and cause
leakage.
5.2 AIR TIGHT TEST
Air tight test should be done after the piping
connection completed.
Operation method:
(a) Fill in dry nitrogen into the refrigerant piping
and let the pressure slowly rise to 4.3MPa.
(b) The specified pressure should be maintained
for 10 minutes, and then soapy water or other
foaming agent are applied to the connection
positions, such as brazing seams, screwed
joints ,etc. for leakage detection.
(c) If it has leakage, then tighten or braze the
leakage point.
(d) After it has been confirmed that the piping
does not leak, the dwelling test should be
performed. Fill in the dry nitrogen again and
let the pressure slowly rise to 4.3MPa.
(e) The pressure needs to be maintained for 6
hours and then record the pressure value
through the manometer. 24 hours later, record
the pressure again.
(f) No pressure drop after 24 hours means it has
no leakage. Otherwise, the leaking point must
be found and mended. Then repeat the above
(d) and (e) steps.
Gas pressure is relevant to ambient temperature.
So temperature should be considered when judging
the pressure variation. The relationship of pressure
and temperature is shown below.
2
1
1
273
1
273
t
P P
t
+
∆ = × −
+
2correction
P P P= − ∆
P∆
— Pressure correction value (Pa)
correction
P
— the correced pressure value (Pa)
1
P
— 1
st
record pressure (Pa)
2
P
— 2
nd
record pressure (Pa)
1
t
— 1
st
record temperature (°C)
1
t
—2
nd
record temperature (°C)
Do not connect indoor units with outdoor units
during the air test process. Otherwise, it may result
in nitrogen gas emtering into the outdoor unit.
5.3 Insulate the piping
After checking it has no leakage, be sure to insulate
the connection parts of both liquid and and gas
pipe with sufficient thickness heat-resistant
polythylene materials.
Be sure to insulate the field piping all the way to
the piping connection inside the unit. Any exposed
piping may casue condensate water or being
scalded if touched.
6 DRAIN PIPING WORK
YDVC series indoor unit drain pipe is the free
drainage.
Be sure the drain pipe works well and smothly
before making the duct connection. (It is not easy
to check the drain pipe when the duct has been
connected.)
6.1 Install the drain pipe
Make sure the drain works properly.
Diameter of the drain pipe should be larger than or
equal to the one of the connecting pipe. (drain pipe
connection diameter of indoor unit is Ф20)
Make a water trap on the drain pipe outlet from
indoor unit. The water trap should meet below
requirements. (A, B 50mm)
If central drain pipe has been used, keep the drain
pipe short and sloping downwards at a gradient of
at least 2/100 to prevent air pockets from forming.
(Refer to Fig. 6)
Fig. 6 Central Drain Pipe
Select central drain pipe of proper size according to
the total capacity of the connected unit.
(a) The parts of drain pan outlet should be well
insulated to avoid condensate water
NO
TE
NO
TE
CAUTION
CAUTION
VRF Air-Conditioner IOM
6
accumulating.
When connecting the drain pipe, effective method
should be carried out to guarantee no leakage on
each connection area.
To avoid condensate water accumulating on the
drain pipe and dropping down, the drain pipe
should be insulated.
6.2 Check the drain pipe
After piping work is finished, check if drainage
flows smoothly.
Free drainage
Gradually insert approximately 1000 ml clean
water into the drain pan to check drainage
status.
The electric wiring works should be performed by
specially qualified electricians.
If no electricians in site, please flow the above
steps to do drainage confirmation after the system
test running.
7 INSTALLING THE DUCT
Materials for duct installation are supplied in the
field.
Refer to Fig. 7 to connect the duct.
Fig. 7 Duct Connection
Wrap both the inlet-side and outlet-side flange and
the duct connection area with aluminium tape for
something similar to prevent air escaping.
Please attach an air filter inside the air passage on
the inlet-side. (Use an air filter which duct
collection efficiency (in a gravimetric technique) is
higher than 50%)
Be sure to insulate the duct to prevent condensate
water from forming. (Material: glass wool or
polyethylene foam, above 25mm thickness)
The air outlet height should be appropriate and
cannot be positioned at the place where it directly
blows the people for a long period.
To reduce vibration and noise, it is better to use
flexible connection to connect the air inlet and
outlet duct with indoor unit.
8 ELECTRIC WIRING WORK
8.1 General introduction
Refer to figure 11 for indoor unit electrical wiring.
All field supplied parts and materials and electric
works must conform to local laws.
Only copper wires can be used.
Please refer to the wiring diagram attached with
the unit when performing the electric work.
Please refer to the installation guide attached with
wire controller for electric and detailed instruction.
All wiring works should be performed by specially
qualified electricians.
Shall install the circuit breaker that can shut off the
whole system.
Do not turn on the power supply unless all the
work has been done.
Refer to the installation guide attached with
outdoor unit for specifications of circuit breaker
switch and wire, etc.
The system incorporates multiple indoor units.
Please number the indoor units before installation.
When performing the communicating wires, must
ensure the numbers of indoor wires are same with
the numbers on the terminals of outdoor unit.
Malfunction will occur if the wire connection is
converse or mistake.
Be sure the air-conditioner is well grounded. Never
connect the ground line with gas pipe, water pipe,
lightning conductor or telephone lines. Improper
grounded may cause electric shock.
Gas pipe: it may cause explosion or fire when
gas leaks.
Water pipe: No grounded when using
stereoplasm polyethylene.
Lighting conductor or telephone wire: the
earthing potential may rise abnormally when
thunderstrike.
Must use the terminal having insulation in order to
avoid short circuit.
Wires shall be fixed firmly, then secure to prevent
external pressure being exerted on the terminal
board.
Wires shall be laid orderly. Lid shall be in place and
fixed securely.
Be sure the ground resistance is lower than 0.1Ω.
NO
TE
NO
TE
CAUTION
CAUTION
VRF Air-Conditioner IOM
7
MCA: Maximum Current (A)
8.2 Power distribution
Refer to Fig. 8 for power distribution of the system.
Fig. 8 Indoor and Outdoor Units Power Distribution Diagram
8.3 Indoor unit field wiring
Refer to the “Wring Diagram” attached to the control box lid for details.
8.4 Setting indoor unit model
Refer to the “Wring Diagram” attached to the control box for the indoor unit setting.
8.5 Communication network
Fig. 9 Connection Line Connection
VRF Air-Conditioner IOM
8
Note: indoor unit communication lines cannot be conversely connected, otherwise it will have
communication failure and the unit cannot startup.
8.6 Install the controller
Install the wire controller on the pre-reserved site
on the wall.
Carcassing for communication wiring should be
ready before installation the controller. The
recommended communication line is RVSP2
0.75. Be sure to pull the wires through the PVC
conduit.
Note: the communication wire and PVC conduit
are the field supplied parts.
8.7 Connect the wire controller and indoor unit
Group control can be realized through the wire
controller. One wire controller can connect to
max 4 indoor units.
The indoor units in one group should be
connected in one and same power supply to
guarantee normal initialization of wire controller
when power on.
Connection sketch of indoor unit and wire
controller:
(a) When one wire controller connecting only
one indoor unit: (refer to Fig. 10)
(b) When one wire controller connecting multi
indoor units: (refer to Fig. 11)
Fig. 10
One wire controller connects to one indoor unit
Fig. 11
One wire controller connects to multi indoor units
YDVC IOM-EN(1212)
Y
DVC
-
IOM(
1204
)
NONE
/