Centrometal CMNET Owner's manual

TU-CMNET-12_1-2022-v2.88f-ENG
CMNET
(connecting PelTec/PelTec-lambda in a cascade)
HEATING TECHNIQUE
Centrometal d.o.o. - Glavna 12, 40306 Macinec, Croatia, tel: [phone], fax: [phone]
Technical instructions
ENG
for install and using the CMNET module -
cascade connection of PelTec/PelTec-lambda boilers

2Technical instructions CMNET
Connection
1.0. CONNECTING BOILERS IN CONFIGURATION 4 (BUF) OR IN
CONFIGURATION 10 (CRO) IN CASCADE
It is possible to connect a maximum of 7 PelTec/PelTec-lambda boilers in a cascade.
Peltec/PelTec-lambda 12-48 kW: all boilers connected in cascade must have configuration 4 (BUF)
or configuration 10 (CRO) selected.
PelTec-lambda 69/96 kW: all boilers connected in cascade must have configuration 4 (BUF) selected.
Important!
PelTec-lambda 69/96 kW boilers with selected configuration 10 (CRO) cannot be connected in a
cascade.
1.1. MASTER / LEADING BOILER
Boiler-1 is the "Master" (the boiler that leads the cascade). If Boiler-1 is disconnected from the cascade
(or runs out of electricity or shuts down at the main switch), Boiler-2 (next by device address)
automatically becomes "Master", but it can perform the function of "Master" only if the sensors of the
Accumulation (buffer) tank / Hydraulic crossover are also connected to it. When Boiler-1 is connected
to the cascade again, it automatically becomes "Master". This "Master" function, if the need arises, can
be taken over by any boiler in the cascade in order according to the address of the device.
The sensors of the Accumulation (buffer) tank / Hydraulic crossover must be connected to the boiler
control of the "Master" boiler (Boiler-1), but there must also be additional sensors of the Accumulation
(buffer) tank / Hydraulic crossover that must be connected to the boiler controllers of the other boilers in
the cascade so that any of the boilers in cascade could become "Master" if the previous "Master" was
disconnected from the cascade for any reason.
The "Master" boiler in cooperation with the CMNET module determines all actions within the cascade
(determines when the next boiler will start/shut down, determines which boiler is "Leading Boiler"...).
The "Leading" boiler is the boiler that starts first, after the first start-up of the boilers in the cascade, the
leading boiler is the "Master", but when it completes a certain number of working hours, the "Leading"
boiler becomes the next boiler according to the serial number of the address, and so on.
GENERAL
These instructions are valid for software versions v2.88f or later.

PARAMETERS:
10.1.1. Configuration:
4 (BUF) or 10* (CRO)*
10.1.2.1. Cascade: 1 CMNET
10.1.2.3. Device number: 2
10.1.2.4. Device Address: 1
EXAMPLE: CASCADE 2 boilers
UTP
CMNET
UTP
Possible connection
to the additional
equipment of boiler 1
Boiler1 (Master)
Boiler2
Connection
1.2. POSSIBLE WAYS OF CONNECTING BOILERS IN CASCADE
3
Technical instructions CMNET
MASTER BOILER (device address: 1)
MUST BE CONNECTED HERE
PARAMETERS:
10.1.1. Configuration:
4 (BUF) or 10* (CRO)*
10.1.2.1. Cascade: 1 CMNET
10.1.2.3. Device number: 2
10.1.2.4. Device Address: 2
(*) - Only valid for PelTec/PelTec-lambda 12-48 kW
Possible connection
to the additional
equipment of boiler 2

EXAMPLE: CASCADE 3-7 boilers
CMNETCMNETCMNET
UTP
UTP
UTP
UTP UTP
Possible connection
to the additional
equipment of boiler 1
Possible connection
to the additional
equipment of boiler 2
Possible connection
to the additional
equipment of boiler 3
PARAMETERS:
10.1.1. Configuration:
4 (BUF) or 10* (CRO)*
10.1.2.1. Cascade: 2 CMNET
10.1.2.3. Device number: 3
10.1.2.4. Device Address: 1
Connection
Boiler1 (Master)
Boiler2
Boiler3
4
PARAMETERS:
10.1.1. Configuration:
4 (BUF) or 10* (CRO)*
10.1.2.1. Cascade: 2 CMNET
10.1.2.3. Device number: 3
10.1.2.4. Device Address: 2
PARAMETERS:
10.1.1. Configuration:
4 (BUF) or 10* (CRO)*
10.1.2.1. Cascade: 2 CMNET
10.1.2.3. Device number: 3
10.1.2.4. Device Address: 3
MASTER BOILER
(device address: 1)
MUST BE
CONNECTED HERE
Technical instructions CMNET
(*) - Only valid for PelTec/PelTec-lambda 12-48 kW

****
Selection of boiler configuration
1.3. SELECTION OF BOILER CONFIGURATION - (4 (BUF) / 10 (CRO))
Cascade can work (can be enabled) only on boilers that have selected configuration 4 (BUF) or
configuration 10 (CRO). All boilers in the cascade must have the same configuration selected.
5
Technical instructions CMNET

1.4. CONFIGURING THE CASCADE
****
Configuring the cascade
6Technical instructions CMNET

CASCADE
Factory: OFF
Possible selection: OFF, 1 CMNET, 2 CMNET
OFF: Cascade is OFF
1 CMNET: cascade of 2 boilers
- 2 boilers in cascade with 1 CMNET device.
2 CMNET: cascade of 2-7 boilers
- 2 boilers in cascade with 2 CMNET devices.
- 3 boilers in cascade with 3 CMNET devices.
- 4 boilers in cascade with 4 CMNET devices.
- 5 boilers in cascade with 5 CMNET devices.
- 6 boilers in cascade with 6 CMNET devices.
- 7 boilers in cascade with 7 CMNET devices.
CASCADE MANAGER
Factory: ON
Possible selection: OFF, ON
This parameter must always be ON, on all boilers in the cascade. If this parameter is turned OFF, the
boiler on which it is turned OFF, as well as boilers with an address that has a higher ordinal number,
regardless of whether this parameter is turned ON or OFF, will not be able to become "Master". This
parameter must not be turned OFF on the boiler with the address "Master" because the cascade will
not work.
7
Configuring the cascade
Technical instructions CMNET

DEVICE ADDRESS
DEVICE NUMBER
Factory: 2
Possible selection: - Min: 2
- Max: 7
With this parameter, we define the number of boilers in the cascade. If we selected 1 CMNET under
"CASCADE", then the number of devices must be 2. If we chose 2 CMNET, then the number of devices
must be as many as there are boilers in the cascade (2-7). It is set on each boiler separately and must
be the same number on all boilers in the cascade.
Factory: 1
Possible selection: - Min: 1
- Max: 7
This parameter determines the address (ordinal number) of the boiler. The boiler with address 1 is the
"Master", and if the boiler with address 1 is disconnected from the cascade (or remains without
electricity or is turned off at the main switch), the boiler with address 2 automatically becomes "Master"
(if the boiler with address 2 is ready in the cascade) and so on. The address of the boilers is also used to
determine the "leading boiler" - the boiler that starts first (depending on the "Time difference" - after how
many hours of operation the boilers change priority of work). The "DEVICE ADDRESS" is entered into
the controller of each boiler in the cascade and each boiler must have a different address.
8
Configuring the cascade
Technical instructions CMNET

b) Configuration 10 (CRO)
Factory: 3600s
Possible selection: min. 0s, max. 18000s
This parameter defines the time from the last arrival of the "Leading boiler" (if several boilers in the cascade
are currently working, then all boilers that are working), to power D6, until the moment of checking the
conditions for the need to start the next boiler (with each modulation of any boiler in the cascade, the time
reset). If at that moment (the moment of checking the conditions for the need to start the next boiler) the
difference in the Hydraulic crossover (Ths_set - Ths_measured) is greater than the dThs_kz parameter,
the next boiler will start.
After checking the conditions for the need to start the next boiler, the time is reset, and when the "Leading
boiler" (if several boilers are currently working in a cascade, then all the boilers that are working) comes to
power D6 starts a new countdown, if this condition is not met, the time stands at zero and waits with the start
of the countdown until this condition is fulfilled. With each modulation of any boiler in the cascade, the time
is reset.
TIME TO ON
a) Configuration 4 (BUF)
Factory: 3600s
Possible selection: min. 0s, max. 18000s
This parameter defines the time from the last arrival of the "Leading boiler" (if several boilers in the cascade
are currently working, then all boilers that are working), to power D6, until the moment of checking the
conditions for the need to start the next boiler (with each modulation of any boiler in the cascade, the time
reset). If at that moment (the moment of checking the conditions for the need to start the next boiler) the
difference in the Accumulation (buffer) tank (Taku_set - Taku_measured) is greater than the dTaku_kz
parameter, the next boiler will start.
After checking the conditions for the need to start the next boiler, the time is reset, and when the "Leading
boiler" (if several boilers are currently working in a cascade, then all the boilers that are working) comes to
power D6 starts a new countdown, if this condition is not met, the time stands at zero and waits with the start
of the countdown until this condition is fulfilled. With each modulation of any boiler in the cascade, the time
is reset.
9
Configuring the cascade
Technical instructions CMNET

TIME TO OFF
Factory: 600s
Possible selection: min. 0s, max. 3600s
This parameter determines after how long operate "Leading boiler" at power (maximum) D3, last
boiler go to extinction phase. It is set on each boiler separately and can be a different value.
TIME DIFFERENCE
Factory: 100h
Possible selection: min. 0h, max. 500h
This parameter define after how many hours of work boilers change priority of work. It is set on each
boiler separately and can be a different value.
Configuring the cascade
10 Technical instructions CMNET

COUNTER RESET
This parameter enable reset of boiler work time counter. It can be reset on each boiler separately.
Configuring the cascade
1.5. ADJUSTMENT dTaku_kz / dThs_kz:
Depending on the selected configuration, dTaku_kz or dThs_kz will appear, if cascade is enabled.
dTaku_kz - the temperature difference in the Accumulation (buffer) tank (Taku_set - Taku_measured) occurs
when configuration 4 (BUF) is selected on the boilers. This parameter is used by the controller at the moment of
checking the conditions for the need to start the next boiler. If at the moment of checking the conditions for the
need to start the next boiler, the difference in the Accumulation (buffer) tank (Taku_set - Taku_measured) is
greater than the dTaku_kz parameter, the next boiler will be start. (For the definition of the moments of checking
the conditions for the need to start the next boiler, see under the point "TIME TO ON").
dThs_kz - the temperature difference in the Hydraulic crossover (Ths_set - Ths_measured) occurs when
configuration 10 (CRO) is selected on the boilers. This parameter is used by the controller at the moment of
checking the conditions for the need to start the next boiler. If at the moment of checking the conditions for the
need to start the next boiler, the difference in the Hydraulic crossover (Ths_set - Ths_measured) is greater than
the dThs_kz parameter, the next boiler will be start.(For the definition of the moments of checking the conditions
for the need to start the next boiler, see under the point "TIME TO ON").
****
Factory: 6°C
Possible selection: min. 1°C, max. 15°C
11
Technical instructions CMNET

Factory: 6°C
Possible selection: min. 1°C, max. 15°C
1.6. USER INTERFACE (disconnect the boiler from the cascade, disabling
the start of the boiler)
BOILER ATTACHED TO
12
Configuring the cascade
Technical instructions CMNET
Factory: ON
Possible selection: OFF, ON
ON - The boiler is part of the cascade
OFF - The boiler has been removed from the cascade
- this boiler will be displayed in gray on the cascade screen
- this boiler will have a STOP/START switch on the boiler screen
Note:
Before taking off the boiler from the cascade, it is necessary to turn off the "BOILER ACTIVATED"
option, otherwise the boiler will start after removing it from the cascade.

BOILER ACTIVATED
Configuring the cascade
13
Technical instructions CMNET
Factory: OFF
Possible selection: OFF, ON
ON - The boiler is active in the cascade system, and if the "BOILER ATTACHED TO" option is turned
on, the "cascade" can control that boiler (start/stop).
OFF - The boiler is not active in the cascade system and "cascade" cannot control it, on the cascade
screen this boiler is shown in standard form except that it is marked "STOP" (red square).
Important:
1. This option is turned off at the factory, if we want this boiler to be controlled by "cascade" it is
necessary to turn on this option.
2. If an individual boiler goes into error, the "BOILER ACTIVATED" option will automatically be turned
off, after the error has been eliminated (corrected) and confirmed, the "BOILER ACTIVATED" option
must be turned on if we want the "cascade" to control this boiler.

14
Configuring the cascade
Cascade ON/OFF
Boiler temperature
Address (ordinal number) of the
boiler in the cascade
Boiler power
State (phase)
of boiler operation
Boiler operation
counter
(hours:minutes)
Indication of the
state (phase) of
boiler operation
Boiler start-up ordinal
number (it's changing,
"Leading" boiler has
number 1)
1.7. CASCADE SCREEN
Cascade screen can be displayed on each boiler in the cascade. The display on the screen of the
cascade of an individual boiler will highlight (frame) the boiler on which we are viewing the cascade
display.
A boiler in a cascade with the "BOILER ATTACHED TO" option turned off will be displayed in gray.
Example:
Screen display of a cascade with two boilers, the review is performed on boiler-1.
Technical instructions CMNET

Connection
It is possible to connect a maximum of 7 PelTec/PelTec-lambda boilers in a cascade.
Note: Scheme 11 (CRO/BUF) is used only in cascade and external start (external control).
Important!
- in this configuration PelTec-lambda 69/96 boiler works only with CM2K module which must be
installed and configurated
- in this configuration at PelTec-lambda 69/96 boiler shown is only Accumulation tank i.e. 2 sensors (at
selection -/BUF)
2.1. MASTER / LEADING BOILER
Boiler-1 is the "Master" (the boiler that leads the cascade). If Boiler-1 is disconnected from the cascade
(or runs out of electricity or shuts down at the main switch), Boiler-2 (next by device address)
automatically becomes "Master", but it can perform the function of "Master". When Boiler-1 is
connected to the cascade again, it automatically becomes "Master". This "Master" function, if the need
arises, can be taken over by any boiler in the cascade in order according to the address of the device.
Connecting the Accumulation (buffer) tank sensor / Hydraulic crossover sensor is not required
because these temperatures are only informative, if sensors are not connected, regulation will show
temperature " - °C". The boiler regulation will not report any error even if the sensors are defective.
The "Master" boiler in cooperation with the CMNET module determines all actions within the cascade
(determines when the next boiler will start/shut down, determines which boiler is "Leading Boiler"...).
The "Leading" boiler is the boiler that starts first, after the first start-up of the boilers in the cascade, the
leading boiler is the "Master", but when it completes a certain number of working hours, the "Leading"
boiler becomes the next boiler according to the serial number of the address, and so on.
2.0. CONNECTING BOILERS IN CONFIGURATION 11 (CRO/BUF)
15
Technical instructions CMNET

PARAMETERS:
10.1.1. Configuration:
11 (CRO/BUF)
10.1.2.1. Cascade: 1 CMNET
10.1.2.3. Device number: 2
10.1.2.4. Device Address: 1
EXAMPLE: CASCADE 2 boilers
UTP
CMNET
UTP
Possible connection
to the additional
equipment of boiler 1
Possible connection
to the additional
equipment of boiler 2
Boiler1 (Master)
Boiler2
2.2. POSSIBLE WAYS OF CONNECTING BOILERS IN CASCADE
MASTER BOILER (device address: 1)
MUST BE CONNECTED HERE
PARAMETERS:
10.1.1. Configuration:
11 (CRO/BUF)
10.1.2.1. Cascade: 1 CMNET
10.1.2.3. Device number: 2
10.1.2.4. Device Address: 2
S9
EXTERNAL START
S9
Option
(for the case in which first boiler doesn't work, e.g. boiler is unplugged)
16 Technical instructions CMNET
Connection

EXAMPLE: CASCADE 3-7 boilers
CMNETCMNETCMNET
UTP
UTP
UTP
UTP UTP
Possible connection
to the additional
equipment of boiler 1
Possible connection
to the additional
equipment of boiler 2
Possible connection
to the additional
equipment of boiler 3
PARAMETERS:
10.1.1. Configuration:
11 (CRO/BUF)
10.1.2.1. Cascade: 2 CMNET
10.1.2.3. Device number: 3
10.1.2.4. Device Address: 1
Boiler1 (Master)
MASTER BOILER
(device address: 1)
MUST BE
CONNECTED HERE
S9
EXTERNAL START
Option
(for the case in which previous boilers doesn’t work, e.g. boilers is unplugged)
Boiler2
PARAMETERS:
10.1.1. Configuration:
11 (CRO/BUF)
10.1.2.1. Cascade: 2 CMNET
10.1.2.3. Device number: 3
10.1.2.4. Device Address: 2
Boiler3
PARAMETERS:
10.1.1. Configuration:
11 (CRO/BUF)
10.1.2.1. Cascade: 2 CMNET
10.1.2.3. Device number: 3
10.1.2.4. Device Address: 3
S9
S9
17
Technical instructions CMNET
Connection

****
Selection of boiler configuration
2.3. SELECTION OF BOILER CONFIGURATION - (11 (CRO/BUF))
Cascade can work (can be enabled) only on boilers that have selected configuration 11 (CRO/BUF). All
boilers in the cascade must have the same configuration selected.
18 Technical instructions CMNET

Temperature displays
2.4. TEMPERATURE DISPLAYS
With this configuration, it is necessary to select the display of temperatures.
Factory: 1 Temperature
Possible selection: 2 Temperatures
1 TEMPERATURE: Hydraulic crossover (not possible for PelTec-lambda 69/96)
2 TEMPERATURES: Accumulation (buffer) tank
12-9612-48
When ’’1 Temperature’’ is selected, screen shows hydraulic crossover with 1 temperature (not
possible at 69/96).
When ’’2 Temperatures’’ is selected, screen shows Accumulation (buffer) tank with 2 temperatures.
This option can be changed only by authorized serviceman.
19
Technical instructions CMNET

2.5. CONFIGURING THE CASCADE
****
Configuring the cascade
20 Technical instructions CMNET