Honeywell S4965V3250 Operating and installation instructions

Honeywell
Heating & Cooling Appliance Controls
Title: Functional description S4965V3250
Doc.: S4965V3250E20
Description
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ESYS CONTROLLER
S4965V3250
FUNCTIONAL DESCRIPTION
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roductionFunctionalDescription/S4965V3250E20.doc $
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$Author:: Mariscak, Igor $
$Id:: S4965V3250E20.doc 84776 2016-08-05 11:03:03Z Mariscak, Igor $

Honeywell
Heating & Cooling Appliance Controls
Title: Functional description S4965V3250
Doc.: S4965V3250E20
Description
Sign.
E.C.N.
Date
Rev.
First issue.
I.Mariscak
0131527
27-Jun-2016
A
SW update and add parameter into list ModBus communication.
I.Mariscak
03-Aug-2016
B
Page 2/33
Table of Contents
1. Software revisions.........................................................................................................................4
2. Reference standards and Approvals............................................................................................5
3. Quality assurance statement ........................................................................................................6
4. Identification ..................................................................................................................................7
5. Product description.......................................................................................................................8
6. Modes of operation......................................................................................................................18
7. Control Panel for ESYS ...............................................................................................................24
8. History information......................................................................................................................25
9. Other documentation...................................................................................................................26
10. Installation..................................................................................................................................27
2.1 - Standards.....................................................................................................................................................5
2.2 - Approvals.....................................................................................................................................................5
5.1 - General ........................................................................................................................................................8
5.2 - Layout ..........................................................................................................................................................9
5.3 - Technical features......................................................................................................................................10
5.3.1 - Connector and connections.................................................................................................................10
5.3.1 - Remarks..............................................................................................................................................10
5.3.2 - High Voltage Connections...................................................................................................................12
5.3.3 - Communication Connector..................................................................................................................12
5.3.4 - Low Voltage Connections....................................................................................................................13
5.3.5 - Specification........................................................................................................................................13
5.4 - Timing diagram..........................................................................................................................................15
5.5 - Recommended peripheral devices ............................................................................................................16
5.6 - System Parameters list (default settings) ..................................................................................................16
5.7 - Sensors and Actuators...............................................................................................................................17
5.7.1 - Safety Cut-off switch (High Limit)........................................................................................................17
5.7.2 - External reset input .............................................................................................................................17
5.7.3 - On board alarm LED ...........................................................................................................................17
5.7.4 - On board reset knob............................................................................................................................17
5.7.5 - Gas Valve............................................................................................................................................17
5.7.6 - Alarm output........................................................................................................................................17
5.7.7 - Burner On output.................................................................................................................................17
6.1 - Start Up......................................................................................................................................................18
6.2 - Stand-by.....................................................................................................................................................18
6.3 - Heating Mode.............................................................................................................................................18
6.4 - Modbus HD Mode......................................................................................................................................18
6.5 - Test Mode..................................................................................................................................................19
6.6 - APS (Air Pressure Switch) function ...........................................................................................................20
6.7 - Fan Speed Control.....................................................................................................................................20
6.8 - Protection and error conditions..................................................................................................................22
6.6 - Ignition sequence.......................................................................................................................................23
10.1 - General remarks......................................................................................................................................27
10.2 - Electrical connection................................................................................................................................27
10.3 - Cables and wirings...................................................................................................................................28
10.4 - Ionization current check...........................................................................................................................28
10.5 - Adjustments and final checkout...............................................................................................................29
10.6 - EMC guidelines........................................................................................................................................29

Honeywell
Heating & Cooling Appliance Controls
Title: Functional description S4965V3250
Doc.: S4965V3250E20
Description
Sign.
E.C.N.
Date
Rev.
First issue.
I.Mariscak
0131527
27-Jun-2016
A
SW update and add parameter into list ModBus communication.
I.Mariscak
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Modbus communication..................................................................................................................30
Modbus address selection .................................................................................................................................30
Modbus communication format..........................................................................................................................31
Modbus supported commands...........................................................................................................................31
Modbus available register map ..........................................................................................................................31

Honeywell
Heating & Cooling Appliance Controls
Title: Functional description S4965V3250
Doc.: S4965V3250E20
Description
Sign.
E.C.N.
Date
Rev.
First issue.
I.Mariscak
0131527
27-Jun-2016
A
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I.Mariscak
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1. Software revisions
Software
Description
Date
Description of amendments
CRC
32320902-001
C0.01_P0.02_E0.01
09-Jun-2016
Modbus protocol is used instead of MicroCom,
possibility to set CH HD and power fan speed via
communication.
659B
32320902-002
C0.02_P0.02_E0.02
19-Jul-2016
Fixed bug related to Modbus command for
production testing “Control input”.
6259
32320902-003
C0.03_P0.02_E0.03
03-Aug-2016
Mix up "APS switching time" and "APS
configuration", add correct parameter.
B21A

Honeywell
Heating & Cooling Appliance Controls
Title: Functional description S4965V3250
Doc.: S4965V3250E20
Description
Sign.
E.C.N.
Date
Rev.
First issue.
I.Mariscak
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2. Reference standards and Approvals
2.1 - Standards
ESYS boiler controller meets the requirements laid down in standards-documents:
EN 298:2012
Automatic gas burner control systems for gas burners and gas burning appliances with or without fans;
EN 55014-1
Electromagnetic compatibility - Emissions;
EN 60730-1
Automatic electric controls for household and similar use;
Regarding electric safety, the ESYS S4965 can be used in appliances according to European Standards for
household electrical requirements EN 60335 series.
2.2 - Approvals
The boiler control conforms to the following EC - Directives:
Gas Appliance Directive 2009/142/EC;
Low Voltage Directive 2014/35/EU;
Electro Magnetic Compatibility Directive* 2014/30/EU.
* Conformity with Electro Magnetic Compatibility Directive regarding emission for non industrial appliances can be assumed
for all selected Ordering Specification (O.S.) numbers.
EMC emission requirements shall be tested after the incorporation of the burner control system into the
equipment.
However conformity can only be declared as part of the appliance.
Regarding immunity, all controls comply with the levels for non industrial appliances.

Honeywell
Heating & Cooling Appliance Controls
Title: Functional description S4965V3250
Doc.: S4965V3250E20
Description
Sign.
E.C.N.
Date
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3. Quality assurance statement
Products are manufactured under an ISO 9001 based and certified Quality System.
The quality system is described in the Honeywell Combustion Controls Center Quality Assurance Program and its related
operational procedures and instructions.
The quality organization is responsible for defining, maintaining, improving and verification of the quality systems in the field
of design, production process and field quality service.
Assembly processes are guided by work instructions.
Patrol inspections form part of the assembly processes.
Assembly inspection is performed by employees of the quality control department, using their own authorized equipment.
All inspections (incoming and assembly) are performed by trained personnel and according inspection procedures.

Honeywell
Heating & Cooling Appliance Controls
Title: Functional description S4965V3250
Doc.: S4965V3250E20
Description
Sign.
E.C.N.
Date
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4. Identification
To ensure product tracking and identification:
On housing label is:
Bar code (or 2D code) label with production data
CE-0063BR1922 printed on the label;
Customer code (if requested)
And each board shows:
Paper label with firmware version, type and model burner control, programming batch, production date.
Laser 2D code label with production data
Customer code (if requested)
Honeywell part number
Customer part number
Notes
S4965V3250
–
–

Honeywell
Heating & Cooling Appliance Controls
Title: Functional description S4965V3250
Doc.: S4965V3250E20
Description
Sign.
E.C.N.
Date
Rev.
First issue.
I.Mariscak
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5. Product description
5.1 - General
Controller ESYS S4965V3250 is intended to be used for industrial DC-fan applications. It is made for fan assisted, direct
burner ignition applications. The ESYS controller operates on 230 Volts, 50-60 Hz and can drive a gas valve and a DC-fan
with PWM control input.
The High Limit protection protects the ESYS from overheating the application and is based on a low voltage switch input
(normally closed).
The controller can operate in normal heating mode or in Test Mode:
- normal heat demand can be generated by a 230V switch input or is given by special command using external
communication port of the ESYS by the appropriate software
- special Test Mode is initiated through external communication port, too
The S4965V3250 burner control operates in conjunction with VK41xxFxxxx or VK41Vxxxxx 1 to 1 premix gas control.

Honeywell
Heating & Cooling Appliance Controls
Title: Functional description S4965V3250
Doc.: S4965V3250E20
Description
Sign.
E.C.N.
Date
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I.Mariscak
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5.2 - Layout
Component side view
Overall dimensions 113 x 100 mm
Board thickness 1,6 mm
Fixing points n° 3 holes Ø 3 mm
Tolerances according to STP0015
Protection degree IP40
Fig. 1 - Component side view.

Honeywell
Heating & Cooling Appliance Controls
Title: Functional description S4965V3250
Doc.: S4965V3250E20
Description
Sign.
E.C.N.
Date
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I.Mariscak
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5.3 - Technical features
5.3.1 - Connector and connections
In the diagram below the connection diagram is shown. The Minifit connector contains the high voltage (230 VAC)
connections, and the Microfit connectors contain the safety extra low voltage connections.
Fig. 2 - Connection diagram.
5.3.1 - Remarks
- If a new heat demand arise during Post purge time, this phase would be interrupted and heat demand is served.
Earth must be connected to the valve, NOT to signal ground on X3.
Following notes need to be considered:
oHL have to be connected to 24V (X3 Pin 10);
oPin 9 is no more a GND connection, but 24V;
oPin 11 is no more 11 V, but 6V.

Honeywell
Heating & Cooling Appliance Controls
Title: Functional description S4965V3250
Doc.: S4965V3250E20
Description
Sign.
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When an EBM fan with 3 wire interface (230 VAC) is being used, an external pull up resistor MUST be used.
The connection and value of the pull up resistor is shown on below picture:
The pull up voltage MUST be taken from the ESYS control;
Resistors must be mounted externally by OEM/Installer;
No lower resistance values are allowed.
Fig. 3 - PWM pull up connection.
Honeywell premix engine fan interface and EBM fan 4 wire interface (BG3612 –230 VAC), do not need any external pull up
resistor for PWM output signal.
Power supply (24V) for fan interface must be taken from ESYS control (X3 Pin 9).

Honeywell
Heating & Cooling Appliance Controls
Title: Functional description S4965V3250
Doc.: S4965V3250E20
Description
Sign.
E.C.N.
Date
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I.Mariscak
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5.3.2 - High Voltage Connections
Connector
name
Pin
Type of Connection
Description
HIGH VOLTAGE (230 VAC) CONNECTIONS
X1
1
Molex Minifit
High Voltage Heat Demand
X1
2
Molex Minifit
Alarm output –Phase
X1
3
Molex Minifit
FAN output –Phase
X1
4
Molex Minifit
Burner On output –Phase
X1
5
Molex Minifit
Main Power Line –Phase
X1
6
Molex Minifit
Not used
X1
7
Molex Minifit
Alarm output –Neutral
X1
8
Molex Minifit
FAN output –Neutral
X1
9
Molex Minifit
Burner On output –Neutral
X1
10
Molex Minifit
Main Power Line –Neutral
SPARK IGNITION CONNECTION
TR1
2.8x0.5mm faston
High voltage Transformer output
FLAME INPUT CONNECTION
X6
4.8x0.8mm faston
Flame rod detection input
EARTH CONNECTION
5.3.3 - Communication Connector
Connector
name
Pin
Type of Connection
Description
X2
1
Molex Microfit
Modbus communication –24V
X2
2
Molex Microfit
Modbus communication –B signal
X2
3
Molex Microfit
Modbus communication –6V
X2
4
Molex Microfit
Modbus communication –ground
X2
5
Molex Microfit
Modbus communication –A signal
X2
6
Molex Microfit
Modbus communication –input (optional)
NOTE: While Modbus Address and Modbus Address Range inputs are opened, device address is set to 1
NOTE: Modbus Communication format 19200 Baud, 8 bits, even parity, 1 stop bit

Honeywell
Heating & Cooling Appliance Controls
Title: Functional description S4965V3250
Doc.: S4965V3250E20
Description
Sign.
E.C.N.
Date
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I.Mariscak
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5.3.4 - Low Voltage Connections
Connector
name
Pin
Type of Connection
Description
X3
1
Molex Microfit
Tacho input signal from FAN
X3
2
Molex Microfit
External Reset switch input
X3
3
Molex Microfit
High Limit switch input –HL
X3
4
Molex Microfit
Air Pressure Switch input –APS
X3
5
Molex Microfit
PWM output signal to FAN
X3
6
Molex Microfit
Modbus Address input
X3
7
Molex Microfit
Modbus Address Range input
X3
8
Molex Microfit
Control Input (0-10V, 4-20mA)
X3
9
Molex Microfit
Supply (24V)
X3
10
Molex Microfit
High Limit switch –supply (24V)
X3
11
Molex Microfit
Supply (6V)
X3
12
Molex Microfit
GND –Air Pressure Switch
X3
13
Molex Microfit
GND
X3
14
Molex Microfit
GND –External Reset switch
X3
15
Molex Microfit
GND –Modbus Address & Modbus Address Range
X3
16
Molex Microfit
GND –Control Input
5.3.5 - Specification
Nominal data
Value
Supply voltage
230 VAC +10%, -15%, 47 –65 Hz
Power consumption
2,5 VA
Humidity
90% RH max at 40°C (no condensing)
Ambient temperature
-20°C – +60°C
Communication
Value
Modbus interface
standard RS485 non insulated (2 wires + GND)
Communication system
Half duplex, asynchronous
Bit rate
19200 Baud
Byte format
1 start, 8 data, 1 stop, even parity
Mode
RTU transmission mode

Honeywell
Heating & Cooling Appliance Controls
Title: Functional description S4965V3250
Doc.: S4965V3250E20
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Electrical rating
Value
Fusing
Ext. fuse 2A slow sand filled
Fan relay output
230 VAC, 0,8 A max, cos φ = 0,6
Burner On relay output
230 VAC, 0,8 A max, cos φ = 0,6
Alarm output
230 VAC, 0,4 A max, cos φ = 0,6
Gas valve output
230 Vrac, 50 mA
High Limit switch input
24 VDC (22 kΩ)
Control Input
0-10 VDC voltage input, 4-20 mA current input
Adress Inputs
10 kΩ NTC linear
Communication cable
max. length: 1200 m, type: J-Y(St)Y 2x2x0,8
Length of wiring for external component
1,0 m max
Ignition
Value
Spark voltage
18 kV
Spark frequency
21,3 Hz +/- 5%
Spark pulse energy
15 μAs
Spark to
ground
Timings
Value
Pre purge/waiting time
10 s (adjustable)
Pre ignition time
2,9 s
Safety time
5 s
Number of ignition trials
3
Flame failure response time
1 s
Stabilization time
10 s (adjustable)
Post purge time
10 s (adjustable)
Pump over run time
-
Anti cycling time
-
Flame sensing
Value
Flame and sparking rod
separate
Flame current (factory parameter setting)
minimum 0,8 μA
Length flame sensing / spark cable
0,5 m max
Product life
Value
For safety and main operator gas valve
500.000 cycles
At rated loads
250.000 cycles
Operations with rated loads
6.000 lock-out

Honeywell
Heating & Cooling Appliance Controls
Title: Functional description S4965V3250
Doc.: S4965V3250E20
Description
Sign.
E.C.N.
Date
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5.4 - Timing diagram
Fig. 4 - Timing diagram.

Honeywell
Heating & Cooling Appliance Controls
Title: Functional description S4965V3250
Doc.: S4965V3250E20
Description
Sign.
E.C.N.
Date
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I.Mariscak
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5.5 - Recommended peripheral devices
Recommended valve: gas/air 1:1 VK41xxFxxxx or VK41Vxxxxx
Recommended display: N/A
5.6 - System Parameters list (default settings)
The controller has safety parameters and functional parameters:
- The safety parameters cannot be changed by the OEM or end user. They are programmed during the production of
the board.
The functional parameters have a predefined value, but can be changed during a later stage. The parameters are stored in
EEPROM. They are not intended for daily changes as the limit for the write is 100 000 cycles. If the parameter needs to be
changed on daily base it has to be stored in volatile memory.
All the parameters can be accessed with a communication package running on the PC. Some parameters are available by
the installer TSP mode on the MMI.
Num.
Description
Unit
Low limit
High limit
Default
Value
ID
(decimal)
1
Fan Kp up factor, Proportional Gain
0
127
45
1287
2
Fan Ki up factor, Integral Gain
0
255
245
1288
3
Fan Kp down factor, Proportional Gain
0
127
30
1289
4
Fan Ki down factor, Integral Gain
0
255
248
1290
5
Absolute Maximum Fan speed
*50 RPM
6
255
116
1296
6
Absolute Minimum Fan speed
*50 RPM
6
255
30
1297
7
Ignition Fan speed
%
0
100
50
514
8
Continuous Fan speed
*50 RPM
(Abs.Min)
(Abs.Max)
33
1298
9
Slope Control
*50 RPM/sec
0
255
0
1299
10
Pre-purge time
HB:min / LB:sec
0 / 0
255 / 60
0 / 10
1293
11
Post-purge time
HB:min / LB:sec
0 / 0
255 / 60
0 / 10
1294
12
Stabilization time
LB:sec
0
255
10
1295
13
Fan configuration
Value
Continuous
Control type
Modulation
0
Off
Modulation
0..10 V
1
On
Modulation
0..10 V
2
Off
On/Off
N/A
3
On
On/Off
N/A
4
Off
Modulation
4..20 mA
5
On
Modulation
4..20 mA
0
255
2
1300
14
APS configuration
Value
APS test
APS test during modulation
0
Off
-
8
On
Not checked
24
On
Checked
0
255
0
1301
15
APS switching time
LB:sec
1
50
50
1302
1516
Suspend mode
0
255
0
515

Honeywell
Heating & Cooling Appliance Controls
Title: Functional description S4965V3250
Doc.: S4965V3250E20
Description
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5.7 - Sensors and Actuators
5.7.1 - Safety Cut-off switch (High Limit)
The safety cut-off switch (also called High Limit switch) prevents the system from being damaged by overheat.
- This switch is in fact the last stop to the ignition control if the appliance is overheating itself. Overheating can be
caused for example by a bad connected temperature sensor or a low water situation.
- This switch is normally closed and opens only if the overheat condition occurs. The controller reads continuously
the status of the switch and immediately activates the lockout state if the switch opens due to whatever reason.
A manual action is required to release the controller from the lockout state. This can be done by the on board reset knob or
external reset button or by the Modbus communication message.
5.7.2 - External reset input
Once a non-volatile lockout occurs, reset can be performed (with max.5 reset in the last hour) by using a remote switch.
5.7.3 - On board alarm LED
The on board alarm LED is used to indicate an Error/Fault condition state:
If there is a blocking error, LED is lighted blinking (1s period).
If the boiler is in any lockout error, LED is on.
Otherwise, no error in the system, LED is off.
5.7.4 - On board reset knob
The on board Reset Knob - button can be used to reset the lockout error. There is no limitation in term of lockout resets
made by this button.
5.7.5 - Gas Valve
The gas valve which must be connected to the Basic ESYS controller is a CVI-m valve. An example of such a valve is the
VK41xxFxxxx or VK41Vxxxxx. There are many other valves which can work together with this ESYS. For more information
about gas valves, please contact the appropriate department or your local Honeywell affiliate.
5.7.6 - Alarm output
Alarm output is set whenever a lockout or blocking condition occurs.
The electrical specification for the Alarm output is described in the table below.
Voltage
Current
Special
230 VAC
0.4 A
Cos φ >= 0.6
5.7.7 - Burner On output
Burner On output indicate whenever the boiler is running (gas valve is opened previously, flame read and validated
successfully). The electrical specification for the Burner On output is described in the table below.
Voltage
Current
Special
230 VAC
0.8 A
Cos φ >= 0.6

Honeywell
Heating & Cooling Appliance Controls
Title: Functional description S4965V3250
Doc.: S4965V3250E20
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6. Modes of operation
The controller has a number of basic modes of operation (from lowest to highest priority):
STAND-BY, when there is no heat demand or error present;
HEATING MODE, when high voltage heat demand input is closed;
Modbus HD MODE, when external command heat demand is received;
TEST MODE, when external Test Mode heat demand is given;
ERROR/FAULT conditions like over temperature conditions, etc.
6.1 - Start Up
After Power On, or manual reset the controller will perform check on safety features (during start-up routines) or
12/24 hours check (not a complete start up routine) depends on whether a heat demand is present:
- When no heat demand is present the control will perform a reset 12 hours after the last one;
- When a heat demand is present, the control will wait until a maximum of 24 hours to perform the reset.
6.2 - Stand-by
In Stand-by mode igniter is off, gas valve is closed and fan is off if fan overrun time is finished and Continuous Fan option is
switched off.
6.3 - Heating Mode
The Normal Heating mode is started when the High Voltage Heat Demand input is closed. When ignition is successful, the
fan can be controlled in a number of ways depending on parameter setting:
0-10 V control, a DC voltage between zero and ten volts can be applied to connector X3, pins 8 & 16.
At zero volt the Fan will run on minimum fan speed. At ten volt the Fan will run on maximum fan speed.
4-20 mA control, with an external resistor of 500 1 % placed between connector X3 pins 8 & 16, the fan speed
can be controlled with a current in the range of 4 to 20 mA.
At 4 mA the Fan will run on minimum fan speed. At 20 mA the Fan will run at maximum fan speed.
On/Off control, when the option On/Off control is selected, the fan speed depends on the fan slope control
parameter. When slope control is off (parameter set to zero), the fan speed will immediately go to maximum.
Otherwise the fan speed will rise from ignition fan speed to maximum fan speed with (value)*50 RPM/sec.
6.4 - Modbus HD Mode
The heating mode is started immediately when a special command receives by external communication.
Name
Function
(hex)
ID (decimal)
Value (hex)
Notes
High byte
Low byte
Modbus HD Mode
0x06
512
Not used
0xCC
Heat demand: ON
0x00
Heat demand: OFF
Power control
0x06
513
Not used
0x00-0x64
Fan speed
The Low byte 0xCC of first message represents this command and second message Low byte defines the power level.
The fan can be controlled between minimum and maximum fan speed by setting a between 0 and 100 % (hexadecimal
representation 0x00 –0x64).
The messages should be repeated at least every 30 seconds to signify none break the burning process. Others way the
Modbus HD is stopped.
After the Normal Heating Mode or the Modbus HD Mode is served, post ventilation is performed, based on parameters
value fan speed and time duration. If speed is setup to zero and timer extends none zero value it’s used last rate of fan
rotation in this phase.

Honeywell
Heating & Cooling Appliance Controls
Title: Functional description S4965V3250
Doc.: S4965V3250E20
Description
Sign.
E.C.N.
Date
Rev.
First issue.
I.Mariscak
0131527
27-Jun-2016
A
SW update and add parameter into list ModBus communication.
I.Mariscak
03-Aug-2016
B
Page 19/33
6.5 - Test Mode
The Test Mode can be used to manually control the fan speed of the burner generated through the external communication
port. If message is not received in 30 seconds again the Test Mode is cancelled.
Name
Function
(hex)
ID (decimal)
Value (hex)
Notes
High byte
Low byte
Test Mode heat demand
0x06
512
Not used
0xFF
Test demand: ON
0x00
Test demand: OFF
Power control
0x06
513
Not used
0 –100 %
Fan speed
The fan speed can be controlled between minimum and maximum fan speed by setting a test level between 0 and 100 %.
When ignition is successful, the fan speed will go to the selected fan speed level according to the following formula:
minimum fan speed + ((maximum fan speed-minimum fan speed)*test mode level)/100

Honeywell
Heating & Cooling Appliance Controls
Title: Functional description S4965V3250
Doc.: S4965V3250E20
Description
Sign.
E.C.N.
Date
Rev.
First issue.
I.Mariscak
0131527
27-Jun-2016
A
SW update and add parameter into list ModBus communication.
I.Mariscak
03-Aug-2016
B
Page 20/33
6.6 - APS (Air Pressure Switch) function
If the APS is configured by adjusting parameter the ignition is not started until the APS switch has performed an open and
close sequence. Also the APS check during modulation can be controlled. Please find in the system parameters table the
proper options and descriptions.
Function
Description
No APS
The ignition is started without checking the APS status.
APS
Before the ignition is started the APS must have had first open (during
fan off) and then close (during fan on) status.
APS mod. Check
(only enabled if APS function is enabled)
The APS is also checked during modulation. If the APS switches off a
restart is performed.
No APS mod. Check
(only enabled if APS function is enabled)
The APS is not checked during modulation. If the APS switches off
nothing will happen, the control remains modulating. At the next heat
demand, the APS is checked again.
With the APS switching time parameter the maximum time can be set on which the control may wait until the APS opens or
closes. If the expected state of the APS is not fulfilled within this time, a lockout error will be set and a reset is required.
The error code for all APS related errors is ‘Error 4’.
NOTE: If the APS is not configured in the software, but an APS switch is connected to the ESYS and this is closed or
closing during operation ‘Error 4’ is also triggered.
6.7 - Fan Speed Control
The following flowchart shows how the fan speed is controlled during a complete burner sequence. The basic states are:
Stand-by, fan is off or at Continuous fan speed when this option is selected;
Prepurge;
Ignition;
Run state, fan speed is controlled by modulation input, on/off control or test mode fan speed;
Postpurge.
The desired fan speed in Continuous and Ignition mode can be independently programmed.