Lennox VEP Series Installation instructions

VEP075N432K
VEP096N432K
VEP120N432K
VEP132N432K
VEP150N432K
Thank you for selecting Lennox VRF. Please read this manual
carefully before operation and keep it for further reference.
INSTALLATION/OPERATION
INSTRUCTIONS
VEP Heat Pump
VRF SYSTEMS
OUTDOOR UNITS
©2018 Lennox Industries Inc.
Dallas, Texas, USA
VEP171N432K
VEP192N432K
VEP210N432K
MODEL NUMBER IDENTIFICATION
9(31 .1
Brand/Family
V(= Variable Refrigerant Flow (VRF)
8QLW7\SH
3= +HDW3XPS2'8
Certification Status
N = ETL (220V and 460V)
Refrigerant Type
4 = R-410A
Voltage
K= 220V/3Ph/50-60Hz
G= 460V/3Ph/60Hz
N= 380-415V/3Ph/50-60Hz
Future Use
Internal Use Only
32 = Internal Use
Nominal Cooling Capacity - Tons
26= 22 Tons
288 = 24 Tons
 = 25.5 Tons
3 = 27.5 Tons
3 = 28.5 Tons
360 = 30 Tons
38= 32Tons
40= 33.5 Tons
4 = 35Tons
 .257RQV
096 = 8 Tons
120 = 10 Tons
132 = 1Tons
150 = 125Tons
171 = 14 Tons
192 = 16 Tons
 = 38 Tons
 = 40 Tons
 = 41.5 Tons
 = 43 Tons
 = 45 Tons
 = 46 Tons
 = 47.5 Tons
 = 49 Tons
 = 51 Tons
 = 54 Tons
 = 56 Tons
 = 59 Tons
 = 60.5 Tons
 = 62.5 Tons
 = 63.5 Tons
 = 62 Tons
 = 67 Tons
 = 68.5 Tons
 = 70 Tons
 = 57.5 Tons
210 = 17.5 Tons
228 = 19Tons
246 = 20.5 Tons 438 = 36.5 Tons 30 = 52.5 Tons
6 - 70 Tons

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 Precautions ............................................................................................................. 1
2 Product Introduction ........................................................................................................... 2
2.1 Names of Main Parts .............................................................................................................. 2
2.2 Combinations of Outdoor Units .............................................................................................. 3
2.3 Combinations of Indoor and Outdoor Units ............................................................................ 4
2.4 The Range of Production Working Temperature .................................................................... 5
3 Preparation before Installation ............................................................................................ 6
3.1 Standard Parts ........................................................................................................................ 6
3.2 Installation Site ....................................................................................................................... 6
3.3 Piping Work Requirements .................................................................................................... 11
4 Installation Instruction ........................................................................................................12
4.1 Physical Dimension of the Outdoor Unit and Mounting Hole ............................................... 12
4.2 Connection Pipe ................................................................................................................... 15
4.3 Installation of the Connection Pipe ....................................................................................... 26
4.4 Air Purging and Refrigerant Charge ..................................................................................... 31
4.5 Electric Wiring ....................................................................................................................... 34
4.6 System Communication ........................................................................................................ 37
4.7 Connection Method and Steps for System Communication................................................. 40
4.8 External Electrical Wiring Diagram ....................................................................................... 45
5 Check Items after Installation and Trial Run ......................................................................47
5.1 Check Items after Installation ............................................................................................... 47
5.2 Trial Run ................................................................................................................................ 47
6 Common Malfunction and Troubleshooting .......................................................................61
7 Error Indication ..................................................................................................................63
8 Maintenance and Care ......................................................................................................67
8.1 Outdoor Heat Exchanger ...................................................................................................... 67
8.2 Drain Pipe ............................................................................................................................. 67
8.3 Notice before Seasonal Use ................................................................................................. 67
8.4 Maintenance after Seasonal Use ......................................................................................... 68
8.5 Parts Replacement ............................................................................................................... 68
9 After-sales Service ............................................................................................................68

1
1 Safety Precautions
(1) Follow this instruction to complete the installation work. Please carefully read this manual before unit
startup and service.
(2) Wire size of power cord should be large enough. The damaged power cord and connection wire should be
replaced by exclusive cable.
(3) After connecting the power cord, please fix the electric box cover properly in order to avoid accident.
(4) Never fail to comply with the nitrigen charge requirements. Charge nitrogen when welding pipes.
(5) Never short-circiut or cancel the pressure switch to prevent unit damage.
(6) Please firstly connect the wired controller before energization, otherwise wired controller cannot be used.
(7) Before using the unit, please check if the piping and wiring are correct to avoid water leakage, refrigerant
leakage, electric shock, or fire etc..
(8) Do not insert fingers or objects into air outlet/inlet grille.
(9) Open the door and window and keep good ventilation in the room to avoid oxygen deficit when the gas/oil
supplied heating equipment is used.
(10) Never start up or shut off the air conditioner by means of directly plug or unplug the power cord.
(11) Turn off the unit after it runs at least five minutes; otherwise it will influence oil return of the compressor.
(12) Do not allow children operate this unit.
(13) Do not operate this unit with wet hands.
(14) Turn off the unit or cut off the power supply before cleaning the unit, otherwise electric shock or injury
may happen.
(15) Never spray or flush water towards unit, otherwise malfunction or electric shock may happen.
(16) Do not expose the unit to the moist or corrosive circumstances.
(17) Under cooling mode, please don't set the room temperature too low and keep the temperature difference
between indoor and outdoor unit within 5ºC(41ºF).
(18) User is not allowed to repair the unit. Fault service may cause electric shock or fire accidents. Please
contact Lennox appointed service center for help.
(19) Before installation, please check if the power supply is in accordance with the requirements specified on
the nameplate. And also take care of the power safety.
(20) Installation should be conducted by dealer or qualified personnel. Please do not attempt to install the unit
by yourself. Improper handling may result in water leakage, electric shock or fire disast er etc..
(21) Be sure to use the exclusive accessory and part to prevent the water leakage, electric shock and fire
accidents.
(22) Make sure the unit can be earthed properly and soundly after plugging into the socket so as to avoid
electric shock. Please do not connect the ground wire to gas pipe, water pipe, lightning rod or telephone
line.
Lennox VRF Unit

2
(23) Energize the unit 8 hours before operation. Please switch on for 8 hours before operation. Do not cut off
the power when 24 hours short-time halting (to protect the compressor).
(24) If refrigerant leakage happens during installation, please ventilate immediately. Poisonous gas will
emerge if the refrigerant gas meets fire.
(25) Volatile liquid, such as diluent or gas will damage the unit appearance. Only use soft cloth with a little
neutral detergent to clean the outer casing of unit.
(26) If anything abnormal happens (such as burning smell), please power off the unit and cut off the main
power supply, and then immediately contact Lennox appointed service ce nter. If abnormality keeps going,
the unit might be damaged and lead to electric shock or fire.
Lennox will not assume responsibility of personal injury or equipment damage caused by
improper installation and commission, unnecessary service and incapable of following the rules
and instructions listed in this manual.
2 Product Introduction
Lennox VRF Modular System adopts inverter compressor technology. According to
change the displacement of compressor, stepless capacity regulation within range of
10%-100% can be realized. Various product lineup is provided with capacity range from
22.4kW to 246kW, which can be widely used in working area and especially applicable to the
place with variable load change. Lennox VRF is absolutely your best choice.
2.1 Names of Main Parts
Fig.1
NO.
①
②
③
④
⑤
Name
Fan, Motor
Electric Box
Assembly
Valve interface
Power cord
through-hole
Communication
code
through-hole
Lennox VRF Unit

3
2.2 Combinations of Outdoor Units
Model(Single)
VEP228N432K VEP246N432K VEP267N432K VEP288N432K
Model(Combined)
VEP096N432K
+VEP132N432K
VEP096N432K
+VEP150N432K
VEP096N432K
+VEP171N432K
VEP096N432K
+VEP192N432K
Model(Single)
VEP306N432K VEP330N432K VEP342N432K VEP360N432K
Model(Combined)
VEP096N432K
+VEP210N432K
VEP120N432K
+VEP210N432K
VEP132N432K
+VEP210N432K
VEP150N432K
+VEP210N432K
Model(Single)
VEP381N432K VEP402N432K VEP420N432K VEP438N432K
Model(Combined)
VEP171N432K
+VEP210N432K
VEP192N432K
+VEP210N432K
VEP210N432K
+VEP210N432K
VEP096N432K
+VEP150N432K
+VEP192N432K
Model(Single)
VEP456N432K VEP480N432K VEP498N432K VEP516N432K
Model(Combined)
VEP096N432K
+VEP150N432K
+VEP210N432K
VEP120N432K
+VEP150N432K
+VEP210N432K
VEP096N432K
+VEP192N432K
+VEP210N432K
VEP096N432K
+VEP210N432K
+VEP210N432K
Model(Single)
VEP540N432K VEP552N432K VEP570N432K VEP591N432K
Model(Combined)
VEP120N432K
+VEP210N432K
+VEP210N432K
VEP132N432K
+VEP210N432K
+VEP210N432K
VEP150N432K
+VEP210N432K
+VEP210N432K
VEP171N432K
+VEP210N432K
+VEP210N432K
Model(Single)
VEP612N432K VEP630N432K VEP648N432K VEP669N432K
Model(Combined)
VEP192N432K
+VEP210N432K
+VEP210N432K
VEP210N432K
+VEP210N432K
+VEP210N432K
VEP096N432K
+VEP150N432K
+VEP192N432K
+VEP210N432K
VEP096N432K
+VEP171N432K
+VEP192N432K
+VEP210N432K
Model(Single)
VEP690N432K VEP708N432K VEP726N432K VEP750N432K
Model(Combined)
VEP096N432K
+VEP192N432K
+VEP192N432K
+VEP210N432K
VEP096N432K
+VEP192N432K
+VEP210N432K
+VEP210N432K
VEP096N432K
+VEP210N432K
+VEP210N432K
+VEP210N432K
VEP120N432K
+VEP210N432K
+VEP210N432K
+VEP210N432K
Model(Single)
VEP762N432K VEP780N432K VEP801N432K VEP822N432K
Model(Combined)
VEP132N432K
+VEP210N432K
+VEP210N432K
+VEP210N432K
VEP150N432K
+VEP210N432K
+VEP210N432K
+VEP210N432K
VEP171N432K
+VEP210N432K
+VEP210N432K
+VEP210N432K
VEP192N432K
+VEP210N432K
+VEP210N432K
+VEP210N432K
Model(Single)
VEP840N432K
Model(Combined)
VEP210N432K
+VEP210N432K
+VEP210N432K
+VEP210N432K
Lennox VRF Unit

4
2.3 Combinations of Indoor and Outdoor Units
(1)The following table indicates the number of IDU for ODU
ODU Model
Max number of connectable IDU (unit)
VEP075N432K
13
VEP096N432K
16
VEP120N432K
19
VEP132N432K
23
VEP150N432K
26
VEP171N432K
29
VEP192N432K
33
VEP210N432K
36
VEP228N432K
39
VEP246N432K
43
VEP267N432K
46
VEP288N432K
50
VEP306N432K
53
VEP330N432K
56
VEP342N432K
59
VEP360N432K
63
VEP381N432K
64
VEP402N432K
64
VEP420N432K
64
VEP438N432K
64
VEP456N432K
64
VEP480N432K
66
VEP498N432K
69
VEP516N432K
71
VEP540N432K
74
VEP552N432K
77
VEP570N432K
80
VEP591N432K
80
VEP612N432K
80
VEP630N432K
80
VEP648N432K
80
VEP669N432K
80
VEP690N432K
80
VEP708N432K
80
VEP726N432K
80
VEP750N432K
80
VEP762N432K
80
VEP780N432K
80
VEP801N432K
80
VEP822N432K
80
VEP840N432K
80
The total capacity of indoor units should be within 50%~135% of that of outdoor units.
Lennox VRF Unit

5
Fig.2
Fig.2 is the combination view of the ODU of Modular DC Inverter Multi VRF System and
the IDU of Multi VRF System. IDU can be cassette type, one-way cassette type, wall-mounted
type, duct type, etc. When any one IDU receives operation signal, ODU will start to work
according to the capacity; when all IDUs stop, ODU will also stop.
2.4 The Range of Production Working Temperature
Cooling
Heating
When the indoor units are all VRF fresh air processor, the unit operating range is as
follows:
Cooling
Ambient temperature: 16°C(60.8℉)~45°C(113℉)
Heating
Ambient temperature: -7°C(19.4℉)~16°C(60.8℉)
NOTICE! Out of the working Temperature Range may damage this products and will
invalidate the warranty.
Lennox VRF Unit
Ambient temperature: -5º C (23º F )~52º C (125.6º F )
Ambient temperature: -20ºC (-4º F )~24ºC (75.2º F )

6
3 Preparation before Installation
NOTICE! The picture is only used for reference and the actual product prevails. Unit:
mm(in.).
3.1 Standard Parts
Please use the following standard parts supplied by Lennox.
Parts for Outdoor Unit
Number
Name
Picture
Quantity
Remarks
1
Owner's Manual
1
2
Wiring (match with
resistance)
1
Must be connected to the last
IDU of communication
connection
3
Mark (Master )
2
Attach on the wired controller of
master IDU or on the front panel
3.2 Installation Site
WARNING
(1) Install the unit at a place where is adequate to withstand the weight of the unit and make sure the unit
would not shake or fall off.
(2) Never expose the unit under direct sunshine and rainfall.Install the unit at a place where is against
dust, typhoon and earthquake.
(3) Try to keep the unit away from combustible,inflammable and corrosive gas or exhaust gas.
(4) Leave some space for heat exchanging and servicing so as to guarantee unit normal operation.
(5) Keep the indoor and outdoor units close to each other as much as possible so as to decrease the pipe
length and bends.
(6) Never allow children to approach to the unit and take measures to prevent children touching the unit.
Lennox VRF Unit

7
3.2.1 When the outdoor unit is totally surrounded by walls, please refer to following
figures for space dimension.
3.2.1.1 Space dimension for single-module unit
Unit: mm(in.)
Fig.3
3.2.1.2 Space dimension for dual-module unit
Unit: mm(in.)
Fig.4
Lennox VRF Unit

8
3.2.1.3 Space dimension for three-module unit
Unit: mm(in.)
Fig.5
3.2.1.4 Space dimension for four-module unit
Unit: mm(in.)
Fig.6
Lennox VRF Unit

9
3.2.2 When there is wall (or similar obstruction) above the unit, keep the distance
between the unit top and the wall at least 3000mm (118-1/8in.) or above. When the
unit is located in a totally open space with no obstructions in four directions, keep
the distance between the unit top and wall at least 1500mm (59in.) or above (See
Fig.7). When space is limited within 1500mm (59in.) or the unit is not set in an open
space, air return pipe is required to be installed in order to keep good ventilation
(See Fig.8).
Unit: mm(in.)
Fig.7 Fig.8
3.2.3 Space dimension for multiple-module unit
For keeping good ventilation, make sure there is no obstructions above the unit.
When the unit is located at a half-open space (front and left/right side is open), install the
unit as per the same or opposite direction.
Fig.9
Lennox VRF Unit

10
Fig.10
3.2.4 Take seasonal wind into consideration when installing the outdoor unit
（1）Installation requirements for unit not connecting exhaust duct:
Fig.11
Fig.12
Lennox VRF Unit

11
（2）Installation requirements for unit connecting exhaust duct:
Fig.13
3.2.5 Take snow into consideration when installing the outdoor unit
Fig.14
3.3 Piping Work Requirements
Refer to the table below for piping work requirements.
R410A Refrigerant System
Outer Diameter (mm/in.)
Wall Thickness mm(in.)
Type
Φ6.35 (1/4)
≥0.8(1/32)
O
Φ9.52 (3/8)
≥0.8(1/32)
O
Φ12.70 (1/2)
≥0.8(1/32)
O
Φ15.9 (5/8)
≥1.0(3/76)
O
Φ19.05 (3/4)
≥1.0(3/76)
1/2H
Φ22.2 (7/8)
≥1.2(1/21)
1/2H
Φ25.40 (1/1)
≥1.2(1/21)
1/2H
Φ28.60 (9/8)
≥1.2(1/21)
1/2H
Φ34.90 (11/8)
≥1.3(2/39)
1/2H
Φ38.10 (12/8)
≥1.5(1/17)
1/2H
Φ41.30 (13/8)
≥1.5(1/17)
1/2H
Φ44.5 (7/4)
≥1.5(1/17)
1/2H
Φ54.1 (17/8)
≥1.5(1/17)
1/2H
Lennox VRF Unit

12
4 Installation Instruction
4.1 Physical Dimension of the Outdoor Unit and Mounting Hole
Outline and Physical Dimention of VEP075N432K and VEP096N432K unit.
Unit: mm(in.)
Fig.15
Lennox VRF Unit

13
Outline and Physical Dimention of VEP120N432K, VEP132N432K and
VEP150N432K unit.
Unit: mm(in.)
Fig.16
Lennox VRF Unit

14
Outline and Physical Dimention of VEP171N432K, VEP192N432K and VEP210N432K unit.
Unit: mm(in.)
Fig.17
Lennox VRF Unit

15
4.2 Connection Pipe
4.2.1 Schematic Diagram of Piping Connection
Fig.18
4.2.2 Schematic Diagram of Piping Sequence
VEP075N432K and VEP096N432K
Fig.19
Lennox VRF Unit

16
VEP120N432K, VEP132N432K and VEP150N432K
Fig.20
VEP171N432K, VEP192N432K and VEP210N432K
Fig.21
4.2.3 Allowable pipe length and drop height among indoor and outdoor units
Y type branch joint is adopted to connect indoor and outdoor units. Connecting method is
shown in the figure below.
Remark: Equivalent length of one Y-type manifold is about 0.5m (19-5/8in.).
Lennox VRF Unit

17
Unit: m(ft.)
Fig.22
L10: Length from the first branch to the farthest IDU;
L11: Length from the first branch to the nearest IDU;
Equivalent length of branch of IDU is 0.5m(1-3/4ft.).
.
R410A Refrigerant System
Allowable Value
m(ft.)
Fitting Pipe
Total length (actual length) of fitting pipe
≤1000(3280-3/4)
L1+L2+L3+L4+…+L9+a+b+…+i+j
Length of farthest
fitting pipe m(ft.)
Actual length
≤165(541-1/4)
L1+L6+L7+L8+L9+j
Equivalent length
≤190(623-1/4)
Difference between the pipe length from the
first branch of IDU to the farthest IDU and the
pipe length from the first branch of IDU to the
nearest IDU
≤40(131-1/4)
L10-L11
Equivalent length from the first branch to the
furthest piping (1)
≤40(131-1/4)
L6+L7+L8+L9+j
Height difference
between outdoor unit
and indoor unit
Outdoor unit at upper(2)
≤90(295-1/4)
——
Outdoor unit at lower(2)
≤90(295-1/4)
——
Height difference between indoor units
≤30(98-2/4)
——
Maximum length of Main pipe(3)
＜90(295-1/4)
L1
From IDU to its nearest branch (4)
≤40(131-1/4)
a,b,c,d,e,f,g,h,i,j
Lennox VRF Unit