Lennox VESZC1 User manual

Owner's Manual
Commercial Air Conditioners
Model:
Multi-VRF Centralized Controller
VESZC1 D
Thank you for selecting LENNOX air conditioners. Please read this
manual carefully before operation and keep it for further reference.

User Notice
 All indoor units must be supplied with unified power.
 Make sure communication cord is connected with the proper port, otherwise
there may occur communication malfunction.
 Never knock on, throw or frequently detach the centralized controller.
 Never operate the centralized controller with wet hands.
 Never scratch the screen of centralized controller by hard or sharp objects.
 If the centralized controller is connected with the outdoor network or the last
indoor unit of the indoor network, then a matching resistance must be
connected between G1 and G2 ports.
 All photos in this manual is only for reference, please refer to the actual product
for the final effect.

Contents
1 INSTALLATION ...................................................................................................... 1
1.1 INSTALLATION REQUIREMENTS .......................................................................... 2
1.2 WIRING INSTRUCTIONS...................................................................................... 3
1.3 INSTALLATION PROCEDURE ............................................................................... 6
1.4 REMOVAL PROCEDURE...................................................................................... 8
2 DISPLAY AND WORKING INSTRUCTIONS............................................................... 8
2.1 MAIN PAGE DISPLAY AND BUTTONS .................................................................. 9
2.2 GENERAL BUTTONS ........................................................................................... 9
2.3 BUTTONS WORKING INSTRUCTIONS................................................................ 10
3 FUNCTIONS DESCRIPTION .................................................................................. 12
3.1 HELP INFO........................................................................................................ 12
3.2 INDOOR UNIT.................................................................................................... 12
3.3 SINGLE UNIT CONTROL ................................................................................... 13
3.4 ALL-CONTROL FUNCTION ................................................................................ 16
3.5 GROUP CONTROL ............................................................................................ 17
3.6 SCHEDULE MANAGEMENT ............................................................................... 18
3.7 LOCAL SETTING ............................................................................................... 21
3.8 ENGINEERING SETTING ................................................................................... 23
3.9 ABOUT .............................................................................................................. 24

Multi-VRF Centralized Controller Operation Manual
1
1 INSTALLATION
Fig.1.1 Parts of Centralized Controller
No.
①
②
③
④
Name
Touch screen
Self-tapping screw ST4.2×9.5
MC
（used to secure the rear cover
of controller）
Rear cover of
controller
Rubber band
QTY
1
4
1
6
No.
⑤
⑥
⑦
⑧
Name
Screw M4×12
(used to secure
earthing wire)
Screw ST4.2×16 FA
(used to secure electric box
cover)
Electric box
cover
Matching
resistance
QTY
1
4
1
1
Fig.1.2 Dimension of Centralized Controller

Multi-VRF Centralized Controller Operation Manual
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Fig.1.3 Dimension of Electric Box Cover
1.1 Installation Requirements
(1) Communication cord of the centralized controller must be selected according
to the table below. Never use the cable that is not in compliance with
instructions of this manual.
Network
Cord type
Cord
standard
Cord size
((mm2/AWG))
Total length
L(m/feet)
Remark
Indoor
network
Light/Ordin
ary
polyvinyl
chloride
sheathed
cord.
(60227
IEC 52
/60227 IEC
53)
IEC
60227-
5:2007
2×0.75~
2×1.25
(2×AWG18~
2×AWG16)
L≤1000m
(L≤3280-5/6feet)
If cord size is 2×1mm2
(2×AWG16),communica
tion cord can be
stretched longer. But the
total length can’t exceed
1500m(4921-1/4feet).
Outdoor
network
L≤250
(L≤820-1/5feet)
Total length of
communication cord
can’t exceed
250m(820-1/5feet).
Notice:
① The cord shall be Circular cord (the cores shall be twisted together).
② If unit is installed in places with intense magnetic field or strong interference, it
is necessary to use shielded wire.
(2) Never install the centralized controller in the following places:
1) Places with corrosive gas or serious dust, salt mist or oil smoke.
2) Wet and damp places, with direct sunlight.
3) Places near high temperature objects or places where units might be
splashed by water.

Multi-VRF Centralized Controller Operation Manual
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1.2 Wiring Instructions
(1) Wiring Ports
Port print
G1, G2
F1, F2
A2, B2
A3, B3
L, N
Meaning
CAN comm.
port
【reserved port】
【reserved port】
【reserved port】
Power
port
(2) Power Supply
The centralized controller shall use independent power supply.
The range of input voltage: 100～240 VAC; Frequency range: 50/60Hz
Select power cord according to the following table. Never use the power cord that
is not in compliance with instructions of this manual.
Cord type
Cord standard
Cord size (mm2)
Single-cord soft
conductiveunsheathed cord
(60227 IEC 08)
IEC 60227-3:2007
1.5
(3) Connection Method
There are three methods to connect centralized controller with the air conditioning
system.
Method 1: Connect with indoor network
Fig.1.4 Centralized Controller Connected with Indoor Network

Multi-VRF Centralized Controller Operation Manual
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Method 2: Connect with outdoor network
Fig.1.5 Centralized Controller Connected with Outdoor Network
Method 3: Connect with heat recollection mode converter Network
Fig. 1.6 Centralized Controller Connected with Heat Recollection Mode Converter
Network

Multi-VRF Centralized Controller Operation Manual
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Wiring Instructions:
a. The centralized controller is applicable to multi VRF units, connectable with
network of indoor units or the network of outdoor units. One centralized controller can
control up to 16 sets of outdoor system and up to 255 sets of indoor unit.
b. If the centralized controller is to be connected with the network of indoor units,
connect according to fig.1.4. The controller can connect with any one indoor unit in
series, that is, connect the controller’s G1 and G2 ports with the D1 and D2 ports
correspondingly with communication cords. When the controller is connected with the
terminal unit of indoor network, a matching resistance needs to be added with the
communication cords at the G1 and G2 ports.
c. If the centralized controller is to be connected with the network of outdoor units,
connect according to fig.1.5. The centralized controller can only be connected with the
terminal system of the outdoor network. A matching resistance needs to be added with
the communication cords at the G1 and G2 ports.
d. The centralized control address DIP switch (SA2_Addr-CC) indicates the
centralized control address required when different refrigerating systems are controlled
in a centralized manner. The default factory setting is "00000".
e. If the centralized controller is to be connected with the network of heat
recollection, connect according to Fig. 1.6. The method 2 is also applicable to
centralized controller switching in heat recollection network.
If the centralized controller is to be connected with the network of outdoor units, set
the DIP switch according to the following methods:
a) The DIP switch must be set on the master unit and set the Master Unit Setting
DIP Switch(SA8) to "00".Otherwise, the setting is invalid.
b) On the same refrigerating system, the centralized control address DIP switch
(SA2_Addr-CC) on a non-master unit is invalid, and it is unnecessary to
change the settings.
c) The centralized control address DIP switch (SA2_Addr- CC) on the master
unit of a refrigerating system must be set to “0000/”, and this system is the
master system.
d) The centralized control address DIP switch (SA2_Addr- CC) on the master
unit of other refrigerating systems must be set as follows:
Note: The centralized control address switch of DIP5 invalidation

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SA2
Address
NO.
DIP1
DIP2
DIP3
DIP4
DIP5
1
0
0
0
/
2
0
1
0
0
/
3
1
1
0
0
/
4
0
0
1
0
/
5
1
0
1
0
/
6
0
1
1
0
/
7
1
1
1
0
/
8
0
0
0
1
/
9
1
0
0
1
/
10
0
1
0
1
/
11
1
1
0
1
/
12
0
0
1
1
/
13
1
0
1
1
/
14
0
1
1
1
/
15
1
1
1
1
/
16
e) The centralized control address DIP switch (SA2_Addr- CC) cannot be the
same between different refrigerating systems. Otherwise, address conflicts
may occur and the unit cannot run properly.
1.3 Installation Procedure
Fig.1.7 Installation Diagram

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Fig.1.8 Diagram of Wooden or Plastic Plug
Fig. 1.9 Installation Holes of the Electric Box Rear Cover
Fig.1.7 is a simple installation procedure of centralized controller. Please pay
attention to the following matters:
(1) Before installation, first cut off the power supply of indoor unit. The power must
be cut off during the whole installation process.
(2) During the installation, be careful not to damage to touch screen.
(3) Before installation, please make the following preparations:
1) In case that the centralized controller is installed on wall, dig a hole that is the
size of 180mm×107mm×62mm and peg 4 wooden or plastic plugs on the
wall according to fig.1.8.
2) In case that the centralized controller is installed inside the control cabinet, dig
4 installation holes on the surface of the control cabinet according to fig.1.9.
(4) In step ①, pull out the power core and communication cord, and then lead
them separately from the wire orifice of the electric box rear cover. Never lead
the cords through a same orifice.
(5) In step ②, locate the electric box rear cover to the installation holes of the wall
with screw ST4.2×16 FA.
(6) In step ⑥ pull out the wire connecting the touch screen and controller’s rear
cover. Put the touch screen on a safe place.