Lennox VRF VECC007C432P User manual

VRF Units
Installation Manual
Compact 4-Way Cassette-AHRI
Thank you for selecting LENNOX air conditioners. Please read this manual carefully before operation
and keep it for further reference.
Indoor
VECC007C432P
VECC009C432P
VECC012C432P
VECC015C432P
VECC018C432P

To Users
Thank you for selecting LENNOX’s product. Please read this instruction manual carefully before
installing and using the product, so as to master and correctly use the product. In order to guide
you to correctly install and use our product and achieve expected operating effect, we hereby
instruct as below:
(1) 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
responsibility for their safety. Children should be supervised to ensure that they do not
play with the appliance.
(2) In order to ensure reliability of product, the product may consume some power under
stand-by status for maintaining normal communication of system and preheating
refrigerant and lubricant. If the product is not to be used for long, cut off the power supply;
please energize and preheat the unit in advance before reusing it.
(3) Please properly select the model according to actual using environment, otherwise it may
impact the using convenience.
(4) This product has gone through strict inspection and operational test before leaving the
factory. In order to avoid damage due to improper disassembly and inspection, which may
impact the normal operation of unit, please do not disassemble the unit by yourself. You
can contact with the special maintenance center of our company if necessary.
(5) For personal injury or property loss and damage caused by improper operation such as
improper installation and debugging, unnecessary maintenance, violation of related
national laws and rules and industrial standard, and violation of this instruction manual,
etc., we will bear no liability.
(6) When the product is faulted and cannot be operated, please contact with our maintenance
center as soon as possible by providing the following information.
1) Contents of nameplate of product (model, cooling/heating capacity, product No., ex-
factory date).
2) Malfunction status (specify the situations before and after the error occurs).
(7) All the illustrations and information in the instruction manual are only for reference. In
order to make the product better, we will continuously conduct improvement and
innovation. We have the right to make necessary revision to the product from time to time
due to the reason of sales or production, and reserve the right to revise the contents
without further notice.
(8) The final right to interpret for this instruction manual belongs to LENNOX.

Contents
1 Safety Notices (Please be sure to abide) ········································ 1
2 Product Introduction··································································· 4
2.1 Names of Key Components ·································································4
2.2 Rated Working Condition·····································································4
3 Preparations for Installation························································· 4
3.1 Standard Fittings·················································································4
3.2 Installation Position Selection······························································5
3.3 Requirements of communication wire selection ····································6
3.4 Wiring Requirements ···········································································7
4 Installation Instructions ······························································ 8
4.1 Indoor unit installation ·········································································8
4.2 Refrigerant Pipe Connection······························································ 10
4.3 Drainage Pipe Installation and Drainage System Testing ···················· 10
4.4 Panel Installation ·············································································· 14
4.5 Installation of Wired Controller··························································· 15
5 Wiring Work ·············································································15
5.1 Connection of Wire and Patch Board Terminal···································· 16
5.2 Power Cord Connection····································································· 17
5.3 Connection of Communication Wire between Indoor Unit and Outdoor
Unit (or indoor unit)················································································· 17
5.4 Connection of Communication Wire for Wired Controller····················· 18
5.5 Wiring Instructions of Wired Controller and Indoor Units Network ······· 18
6 Routine Maintenance ·································································20
6.1 Cleaning of Filter··············································································· 20
6.2 Maintenance before the Seasonal Use ··············································· 20
6.3 Maintenance after the Seasonal Use·················································· 20
7 Table of Error Codes for Indoor Unit ·············································20
8 Troubleshooting········································································21

Compact 4-Way Cassette Indoor Unit
1
1 Safety Notices
Warning: If not strictly followed, it may cause severe damage to the unit or the people.
Note: If not followed strictly, it may cause slight or medium damage to the unit or the people.
This sign indicates that the operation must be prohibited. Improper operation may cause
severe damage or death to people.
This sign indicates that the items must be observed. Improper operation may cause
damage to people or property.
WARNING!
This product can’t be installed at corrosive, inflammable or explosive environment or the
place with special requirements, such as kitchen. Otherwise, it will affect the normal
operation or shorten the service life of the unit, or even cause fire hazard or serious
injury. As for above special places, please adopt special air conditioner with anti-
corrosive or anti-explosion function.
Please install the unit
according to instructions in
this manual. Read this
manual carefully before
starting up or checking the
machine.
Installation should be
performed by dealer or
qualified technicians. Do not
install the product by
yourself. Improper installation
may result in water leakage,
electric shock or fire hazard.
Make sure the local power
supply is in accordance with
units before installation, and
check the power supply
carefully.
This air conditioner must be
properly grounded through
the receptacle to avoid
electric shock. The grounding
wire shouldn’t be connected
with gas pipe, water pipe,
lightning arrester or
telephone line.
Please use specialized
accessories or parts to carry
out installation, or water
leakage, electric shock, fire
hazard may resulted.
R410A refrigerant can
produce poisonous gas once
it meets fire, so please
ventilate the room
immediately if refrigerant
leaks out during installation.
Diameter of power cord must
be large enough. Damaged
power cord and connecting
wire must be replaced by
specialized electric cable.
After the power cord is
connected, please install the
cover of electric box to avoid
danger.

Compact 4-Way Cassette Indoor Unit
2
Nitrogen must be charged
according to technical
requirements.
Short circuit is forbidden. Do
not cancel the pressure
switch in case the unit may
be damaged.
For units with wired
controller, do not connect
power supply until the wired
controller is well installed.
Otherwise, the wired
controller cannot be used.
When the installation is
finished, please check and
make sure the drain pipe,
pipeline and electric wire are
all well connected in order to
avoid water leakage,
refrigerant leakage, electric
shock or fire hazard.
Do not extend fingers or
objects into air outlet or air
return grille.
If you use gas heater or
petroleum heater in the same
room, please open the door
or window to maintain good
air circulation in case the
room may lack of oxygen.
Never start or stop the air
conditioner by inserting or
removing the power cord.
Do not turn off the air
conditioner until it runs for at
least 5 minutes. Otherwise,
oil-return of the compressor
will be affected.
Children are not allowed to
operate the air conditioner.
Do not operate the air
conditioner with wet hands.
Please turn the unit off and
unplug your air conditioner
before cleaning. Otherwise, it
may cause electric shock or
personal injury.
Do not spray water on the air
conditioner or it will cause
malfunction or electric shock.
Do not expose the air
conditioner directly to water
or place it in a damp or
corrosive environment.
Connect power supply 8
hours before operation. Do
not disconnect power if you
want to stop the unit in a
short period of time, e.g. in
one night (This is for
protecting the compressor).

3
Volatile liquid like thinner or
gasoline will damage the
appearance of air conditioner
(Please use soft dry cloth
and wet cloth with mild
detergent to clean the outer
case of air conditioner).
During Cooling mode, indoor
temperature should not be
set too low. Keep the
difference between indoor
temp and outdoor temp
within 5℃(9oF).
If abnormal condition occurs
(e.g. unpleasant smell),
please turn off the unit at
once and disconnect power
supply. Then contact LENNOX
service center. If the air
conditioner continues to
operate despite of abnormal
condition, the unit may be
damaged and it may cause
electric shock or fire hazard.)
Do not repair the air
conditioner by yourself.
Improper repair will cause
electric shock or fire hazard.
Please contact LENNOX
service center and have it
repaired by professional
technicians.
Any personal injury or property loss caused by improper installation, improper debug,
unnecessary repair or not following the instructions of this manual should not be the responsibility
of LENNOX.
Correct Disposal of this product
This marking indicates that this product should not be disposed with other
household wastes throughout the EU. To prevent possible harm to the
environment or human health from uncontrolled waste disposal, recycle it
responsibly to promote the sustainable reuse of material resources. To return
your used device, please use the return and collection systems or contact the
retailer where the product was purchased. They can take this product for
environmental safe recycling.
R410A (R32/125:50/50):2087.5
Compact 4-Way Cassette Indoor Unit
(86oF)
(79oF)

4
2 Product Introduction
2.1 Names of Key Components
No.
①
②
③
④
⑤
Name
the hanger bracket
Drainage Pipe
Louver
Connection Pipe
Air Inlet Grille
(With Filter)
2.2 Rated Working Condition
Indoor Side Condition
Outdoor Side Condition
Dry Bulb Temp℃(oF) Wet Bulb Temp℃(oF) Dry Bulb Temp℃(oF) Wet Bulb Temp℃ (oF)
Rated Cooling
26.7(80) 19.4(67) 35(95) 24(75)
Rated Heating
21.1(70) 15.6(60)
3 Preparations for Installation
Note: this picture is for reference only, please refer to the actual product; the unit of dimension
is mm.
3.1 Standard Fittings
Please use the supplied standard fittings listed below as instructed.
No.
Name
Appearance
Q'ty
Usage
1
Drainage hose assembly
1
To connect the drainage pipe.
2
Special Nut
1
To be used for connecting the
refrigerant pipe.
3
Insulation
1
To insulate the gas pipe.
4
Insulation
1
To insulate the liquid pipe.
Compact 4-Way Cassette Indoor Unit
8.3(47) 7.1(45)

5
No.
Name
Appearance
Q'ty
Usage
5
Sponge
2
To insulate the drain pipe.
6
Fastener
4
To fasten the sponge.
7
paper pattern for installation
1
Locate the drill hole on ceiling.
8
Tapping screw with washer
4
Fix paper pattern.
9
Remote controller
1+2
To control the indoor unit.
10
Washer fixing plate
4
Prevent the washer from falling off.
3.2 Installation Position Selection
(1) The location should be able to withstand the weight of unit.
(2) The water can be drained conveniently from drainage pipe.
(3) There should be no obstruction near air inlet and air outlet.
(4) Follow the installation distance required in the fig below to ensure sufficient space for
maintenance.
(5) The installation location should be far from heat sources, flammable or explosive gas, or
smog spread in the air.
(6) The appliance shall not be installed in the laundry.
(7) The indoor unit, outdoor unit, power cord and connection electricity wire should be at least
(8) 1m from television and radio in order to prevent interference and noise (Even though 1m
distance is ensured, there may be noise if the electric wave is too strong).
mm (in)
Fig 3.2
Compact 4-Way Cassette Indoor Unit
(>3/4)
(>98)
(>59)
(>59)
(10)

6
Notes:
①The unit shall be installed in accordance with national standards or local regulations.
②Only qualified personnel can carry out installation work, please contact with local
dealer before installation.
③Make sure all the installation work completed before energizing.
3.3 Requirements of communication wire selection
Note!
If air conditioner used under strong electronic-magnetic interference circumstance, STP
(shielded twisted pair) communication cable must be adopted.
3.3.1 Select Communication Line for Indoor Unit and Wired Controller
Fig 3.3.1
Material type
Total length of
communication line
between indoor unit
and wired controller
L (m)
Wire size (mm2)
Material
Standard
Remarks
Light/Ordinary
polyvinyl chloride
sheathed cord.
(60227 IEC 52
/60227 IEC 53)
L≤250m
2×0.75～2×1.25
IEC
60227-5
1. Total length of communication
line can't exceed 250m.
2. The cord shall be Circular cord
(the cores shall be twisted
together).
3. If unit is installed in places with
intense magnetic field or strong
interference, it is necessary to
use shielded wire.
3.3.2 Select Communication Line for Indoor Unit and Outdoor Unit
Fig 3.3.2
Compact 4-Way Cassette Indoor Unit

7
Material Type
Total Length L (m)
of Communication
Cable between
Indoor Unit and
Indoor (Outdoor)
Unit
Wire size (mm2)
Material
Standard
Remarks
Light/Ordinary
polyvinyl
chloride
sheathed cord.
(60227 IEC 52
/60227 IEC 53)
L≤1000m
≥2×0.75
IEC 60227-5
1. If the wire diameter is enlarged to 2×1
mm2, the total communication line
length can reach 1500 m.
2. The cord shall be Circular cord (the
cores shall be twisted together).
3. If unit is installed in places with
intense magnetic field or strong
interference, it is necessary to use
shielded wire.
3.4 Wiring Requirements
(1) Dimension of power cord and capacity of air switch
Notes:
①The circuit breaker and power cord specification in above sheet are based on max
power (max current) of the unit.
②The power cord specification in above sheet is based on ambient temperature of 40℃.
③The circuit breaker specification in above sheet is based on ambient temperature of
40℃.
④If the working condition is different, please adjust it according to the specification sheet
of circuit breaker.
Model
Power Supply
MOP
(A)
Minimum Sectional
Area of Power Cord
(mm2)
VECC007C432P
220-240V-1ph-50Hz
208-230V-1ph-60Hz
15 2 1
VECC009C432P 15 2 1
VECC012C432P 15 2 1
VECC015C432P 15 2 1
VECC018C432P 15 2 1
Compact 4-Way Cassette Indoor Unit
MCA
(A)

8
4 Installation Instructions
4.1 Indoor unit installation
4.1.1 Indoor Unit Dimension and Suspension Bolt Position
Fig 4.1.1
Below are dimensions of A, B, C, etc. for different models:
Unit: mm
Model A B C D E F)
Drainage
Pipe(Outer
Diameter×wall
thickness)
Outer Diameter of
Connection Pipe
Liquid
pipe Gas pipe
VECC007C432P
670
(26 3/8")
Φ25×2. 5
(Φ1")
1/4" 3/8"
VECC009C432P 1/4" 3/8"
VECC012C432P 1/4" 1/2"
VECC015C432P 1/4" 1/2"
VECC018C432P 3/8" 5/8"
Important: The drilling work and installation of unit must be carried out by qualified
personnel.
4.1.2 Suspend the Indoor Unit
(1) Drill bolt holes and install bolts.
1) Stick the paper pattern on the installation position; drill 4 holes according to the hole site
on the cardboard as shown in fig 4.1.2; diameter of drilling hole is according to the diameter
of expansion bolt and the depth is 60-70mm (2-1/3 - 2-3/4in), as shown in fig 4.1.3.
Compact 4-Way Cassette Indoor Unit
596
(23 1/2")
592
(23 5/8")
571
(22 1/2")
145
(5 11/16")
240
(9 1/2")

9
Fig 4.1.2 Fig 4.1.3
2) Insert the M10 expansion bolt into the hole and then knock the nail into the bolt, as
shown in fig 4.1.4.
Note:
The length of bolt depends on the installation height of the unit, bolts are field supplied.
Fig 4.1.4
(2) Install the indoor unit temporarily.
Assemble suspension bolt on the expansion bolt, attach the hanger bracket to the suspension
bolt. Be sure to fix it securely by using a nut and washer from upper and lower sides of the hanger
bracket. The washer fixing plate will prevent the washer from falling.
(3) The usage of paper pattern.
Refer to paper pattern of installation for ceiling opening dimension. The center of ceiling
opening is indicated on the paper pattern. Fix the paper pattern to the unit with 4 screws and fix the
corners of the waterspout at the drainage pipe by screws.
(4) Adjust the unit to the right position.
(5) Check the level of the unit. The indoor unit is equipped with build-in water pump and float
switch, verify the levelness of 4 directions by level gauge or vinyl tube (filled with water)
respectively.
(6) Remove the washer locating plate and then tighten the nut on it.
(7) Remove the paper pattern.
Compact 4-Way Cassette Indoor Unit

10
Fig 4.1.5
4.2 Refrigerant Pipe Connection
(1) Aim the flaring port of copper pipe at the center of screwed joint and then tighten the flaring
nut with hand as shown in fig 4.2.
(2) Use a torque wrench to tighten up the flaring nut until the wrench gives out a click sound.
Fig.4.2
(3) The pipe should not be bent too much or it may crack. Use a pipe bender when bending
the pipe.
(4) Wrap the connection pipe and joint with sponge and then tie them firmly with tape.
4.3 Drainage Pipe Installation and Drainage System Testing
4.3.1 Notice for Installation of Drainage Pipe
(1) The drainage pipe should be short and the gradient downwards should be at least 1%～
2% in order to drain condensation water smoothly.
(2) The diameter of drainage hose should be bigger or equal to the diameter of drainage pipe
joint.
Torque for tightening nut
Pipe diameter mm(in)
Torque (N·m)
Φ6.35 (1/4)
15～30
Φ9.52 (3/8)
35～40
Φ12.7 (1/2)
45～50
Φ15.9 (5/8)
60～65
Compact 4-Way Cassette Indoor Unit

11
(3) Install drainage pipe according to the following fig and arrange insulation to the drainage
pipe. Improper installation may lead to water leakage and damp the furniture and other
things in the room.
(4) You can buy normal hard PVC pipe used as the drainage pipe. During connection, insert
the end of PVC pipe into the drainage hole and then tighten it with drainage hole and wire
binder. Never connect the drainage hole and drainage hose with glue.
(5) When the drainage pipelines are used for several units, the position of pipeline should be
about 100mm lower than the drainage port of each unit. In this case, thicker pipes should
be applied.
Fig 4.3.1
4.3.2 Installation of Drainage pipe
(1) Drainage pipe should have the same diameter or larger diameter than the connection
pipes(PVC pipe, outside diameter 25mm, thickness≥1.5mm).
(2) Keep drainage pipe short and sloping downwards at a gradient of at least 1% for preventing
forming air bubbles.
(3) Insert the drainage hose into drain socket and then tighten the metal clamp securely.
(4) Warp the sealing pad over drainage hose and metal clamp for heat insulation.
(5) Make sure to perform insulation work for all drainage holes in the room in order to prevent
any possible water dropping due to dew condensation.
(6) Apply the suitable diameter for converging drainage pipe according to the operating
capacity of the unit, as show in Fig. 4.3.2.1.
Fig 4.3.2.1
①-Drainage pipes assembled by T-shaped joints
(7) The horizontal pipe can’t be connected to vertical pipe in the same level; please select the
connection way as shown in following fig.
NO.1: Three-way connection of drainage pipe joints (Fig 4.3.2.2).
NO.2: Connection of downspout elbow (Fig 4.3.2.3).
Compact 4-Way Cassette Indoor Unit

12
NO.3: Inserting horizontal pipe connection (Fig 4.3.2.4).
Fig 4.3.2.2 Fig 4.3.2.3 Fig 4.3.2.4
(8) Drainage pipes should have a downward slope of at least 1%～2%, in order to prevent
pipes from sagging; install hanger bracket at intervals of 1000～1500mm (39-59in).
Fig 4.3.2.5
(9) The installation height of raising pipe for drainage should be lower than B. The gradient
from raising pipe towards drainage direction should be at least 1%～2%. If the raising pipe
is vertical with the unit, the raising height should be less than C, as shown in Fig 4.3.2.6.
Fig 4.3.2.6
Model A mm (in) B mm(in) C mm(in)
VECC007C432P
VECC009C432P
VECC012C432P
VECC015C432P
VECC018C432P
170 (6-11/16) 830 (32-11/16) 780 (30-11/16)
Compact 4-Way Cassette Indoor Unit
(39-59in)
(39-59in)
(<39in)

13
(10) During the installation, distance from soft drain pipe to the gasket is C mm when the bolt
is tightened. It is not allowed to apply PVC or other related glue in the joints of two ends
of drain pipe.
Fig 4.3.2.7
Model
C mm(in)
ALL 10±3 (3/8 ±1/8)
4.3.3 Test of Drainage System
(1) Please test drainage system after electric work is finished.
Inject approximately 1L purified water to drain pan from air vent, ensure that not to splash the
water over the electrical components (e.g. water pump. etc).
1) In case of commissioning finished, please energize the IDUs and switch to cooling or
dry mode, meanwhile, the water pump operates, you can check the draining through
the drain socket.
2) If communication wire is not connected, communication malfunction “C0” will occur
after 60s of energizing. In this case, the water pump operates automatically. Check if
the water pump drains normally through drainage port. The water pump will stop
automatically after running for 10mins.
(2) During the test, please carefully check the drainage joint, make sure no any leakage occur.
(3) It is strongly recommend to do the drain test before ceiling decoration.
Fig 4.3.3
Compact 4-Way Cassette Indoor Unit

14
4.4 Panel Installation
4.4.1 Notices for Installation
(1) Improper decorative panel installation could cause the following problems.
Fig 4.4.1
(2) Ensure that it’s clearance-free between decoration panels and ceiling board after
installation, if not, please adjust the body position.
Fig 4.4.2
(3) Connect the decoration panel terminals (Female) to body terminals (male) as shown in
figure4.4.3.
Fig 4.4.3
4.4.2 Panel Installation
(1) Detach the panel’s Corner Cap, there is a mark “piping side” on one of the 4 corners,
adjust the panel direction so as to keep the mark and fittings on the same corner , as
shown in fig4.4.4.
Fig 4.4.4
Compact 4-Way Cassette Indoor Unit

15
(2) Temporality hang the panel to body (there is four hangers on each corner of the panel,
hang the hangers to corresponding hooks on the body), as shown in fig 4.4.5.
(3) Detach the air inlet grille from panel, make a wiring connection of signal receiver. Notices
that the connection wire not stuck in the middle of body and panel, or may cause air
leakage and lead to condensation water drop.
(4) Tighten 4 screws at each corner of panel respectively, fix the panel on the body firmly.
(5) After tightening screws, reinstall the air inlet grille.
Fig 4.4.5
4.5 Installation of Wired Controller
Wired controller is optional accessory. If wired controller is needed, please contact your local
dealer and install the wired controller according to the instruction manual.
Note:
Do perform the commissioning operation before first use; automatic addressing or other
settings, please refer to the manual of ODU.
5 Wiring Work
Note:
Units must be grounded securely, or it may cause electric shock.
1) Please carefully read the nameplate and the wiring diagram before carry out the wiring work,
Compact 4-Way Cassette Indoor Unit
(3/16 - 5/16)
Units: mm (in)