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10964_r02

DIGITAL MICROFLAT "N" SERIES
APPLICATION
The microcontroller-based controllers of the DIGITAL MICROFLAT D(M/E)N. DT(M/E)N.
"N" series are specifically designed to control gas atmospheric burners (with or without fan in the combustion circuit) or oil D(M/E)NO. DT(M/E)NO.
atmospheric burners in non-permanent operation applications. These systems are provided with non-volatile or volatile lockout, in the first case restarting the controller from a safety lockout AUTOMATIC CONTROL DIGITAL SYSTEM FOR
condition can be accomplished only by a manual reset of the GAS AND OIL BURNERS AND APPLIANCES
system, while in the second case restarting the controller from a safety lockout condition can be achieved only by the interruption of the power supply and its subsequent restoration (and not by switching the heating demand device). The automatic controllers of this series are suitable for: Heating boilers; Hot air generators; Radiant tube heaters; Fan-assisted convector heater ; Monoblock burners. The DIGITAL MICROFLAT "N" series keeps the main features and reliability of the previous MICROFLAT and DIGITAL MICROFLAT series, and in addition it's got options related to the driving of auxiliary motors, direct current valves, modulating valves among which the new Brahma valve type VCM0x. Besides, this series can be employed also in oil appliances. The flexibility of the microcontroller-base technology creates different possibilities related to the installation times and to the operation modes. The systems of this series are suitable to be
used in gas fired hot air generators in accordance with EN 525, EN
1020 and EN 1319 standards or in oil fired hot hair generators in
accordance with part 2 of DIN 4794 standard (December 1980
edition related to the hot air generators, only in version TW = 20s
and TS = 5s).
FEATURES
Table 1 and table 2 show the main features of this series. Other
important features are:
− EC- type certification (CE PIN 0694BP0610) in accordance with
the European Gas Appliance Directive 90/396/EEC and following amendments of 93/68/EEC Directive; − In accordance with EN 298:2003-09 (European Standard for automatic gas burner control systems and flame detection); − In accordance with EN 230:2005 (European standard for automatic oil burners control systems and flame detection); − A microcontroller based technology for precise and repeatable installation times; − Two independent safety contacts for driving the gas valve; − Possibility to drive the Brahma modulating valve Type VCM0x; − Possibility to drive the first direct current valves by means of a high voltage modulator circuit or through a bridge rectifier (integrated); − Output employable for the control of the second stage (intermittent pilot system), for the control of auxiliary fans or acting as a NO auxiliary contact (this contact is not isolated from the main supply voltage by reinforced isolation, therefore it not suitable to control SELV circuits – Safety Extra Low Voltage, e.g. 24V); 10964_r02 − inbuilt ignition device completely of solid state design, highly TECHNICAL DATA
efficient and equipped with a EMC filter-suppressor; Nominal power supply voltage
220-240V∼ @ 50-60 Hz − Possibility of connecting a resistor (100 ÷ 470 Kohm) in series Power consumption:
to the lockout signal output in order to prevent the controller Operating temperature:
-20 °C ÷ +70 °C Humidity:
Max. 95% at +40 °C damage in case the lockout button connections are inverted by Protection degree:
chance with the lockout signal connections ; Internal fuse:
4 A fast-blow type − Possibility to be connected to a user interface module with External fuse (recommended):
3.15 A fast-blow type (5)
diagnostic and modulation parameters setting functions; Max. total weight:
− Flame detection using the rectification property of the flame (ionization, only for gas appliances) or a photocell (only for the The external fuse value must be selected according to the maximum applied load. This value must not anyway exceed the oil appliances). For further information see the paragraph internal fuse value. related to the flame monitoring; − Direct ignition of the burner or ignition by means of an intermittent pilot; Waiting/prepurge time (TW/TP):
− Multiple ignition attempts. In the standard mode the controller Safety time (TS)
proceeds to the lockout condition if no flame is detected at the end of safety time. Upon request, with option Ynn, it's possible Spark ignition time (TSP):
to set nn number of recycle attempts before lockout. Response time in case of flame failure
Possibility to be connected to phase-phase power supply (GAS versions):
Safety time during operation (OIL
versions)
Table 1 – Main features of DIGITAL MICROFLAT "N"
Postpurge times:
series for gas appliances
- for main combustion motor: - for auxiliary motor: V
EV2 TS
EN 298
Type
Inter-waiting or Inter-purge time:
Code
Opening delay of EV2 or the auxiliary fan
(opt. Wnn):
Lockout delay due to flame simulation
(opt. Knn):
Lockout on PA failure to close
(opt. Qnn) (6):
Lockout on TC failure to close
(opt. Qnn) (7):
Pre-ignition time:
Recycle attempts:
Painting:
Maximum contacts rating
Room thermostat:
0.5 A cos ϕ ≥ 0.4 EV1 valve:
− Standard or with opt. C1: 0.5 A cos ϕ ≥ 0.4 − With opt. C(2-3-4-5-6): EV2 valve – tangential fan:
0.5 A cos ϕ ≥ 0.4 Table 2 – Main features of DIGITAL MICROFLAT "N"
Combustion fan:
0.5 A cos ϕ ≥ 0.4 series for oil appliances
Ignition transformer (8):
0.5 A cos ϕ ≥ 0.4 Preheater (9):
V
EV2 TS
EN 230
Type
Lockout signal:
Code
− Standard (10):
− With opt. R (10): 0.5 mA cos ϕ = 1
− With opt. F (11):
User interface:
Air pressure switch – Only in the gas versions Preheater thermostat – Only in the oil versions Only in versions provided with option "PR" and in the oil versions Only in the oil versions Load driven by opto-triac. (11) Load driven by triac.
Combustion motor-fan Under-voltage and over-voltage protection:
EV2 valve: this output can be used to signal the flame presence In case the power supply voltage is lower than about 165VAC or to a remote device. higher than 290VAC the controller will go to the safety condition. It Safety Thermostat: Opening the safety thermostat causes a will restart when the power supply voltage will be between about recycle followed by lockout. 175VAC e 280VAC. 10964_r02 Maximum length of external components cables:
Overall dimensions
Room thermostat:
The controllers of the DIGITAL MICROFLAT series can be Reset – remote lockout signal:
supplied in different executions but with the same case. Ignition device (high voltage):
Figure 1 shows the controllers overall dimensions. The rest of the cables (loads power supply cables,
air pressure switch cable and connection cable to the user interface board):

Flame monitoring – gas versions
The flame detector uses the rectification property of the flame.
An important safety aspect is that the controller is more sensitive to
flame at start or during the waiting/pre-purge time (negative differential switching). Minimum ionization current:
Recommended ionization current:
3 ÷ 5 times the Minimum insulation resistance of
Fig. 1 – Overall dimensions
detection electrode and cable to earth:
Maximum electrode parasitic capacity :
Possible fixing systems
Maximum short-circuit current :
Top:
self-tapping screw UNI6951AB 2.9x22 Flame monitoring – Oil versions
screwplast thread forming screw In this type of application, flame is detected by a sensor or a ISO0003 F 3.5x13 screwplast thread forming screw The following table shows the various photocell models produced ISO0003 F 3.9x13 by BRAHMA and classified according to their sensitivity. Overall dimensions and fixing templates are shown in paragraph Connection
Employing non-reversible connectors with a different number of Type
Side
poles makes the connection easy and reliable. Lateral and frontal One-way fast-on connectors of different sizes for ignition and detection electrodes permit their easy installation and replacement. Lateral and frontal The dual output ignition device allows spark generation on one Lateral and frontal point (2a), two points (2b) or between two electrodes isolated from Lateral and frontal the metal frame of the burner (2c), see Fig.2. The (2c) Lateral and frontal configuration assures a limited EMC emission. Integrated ignition device (12)
Peak voltage (13):
Peak current:
Spark repetition frequency (14):
Upon request: 1 … 50 Hz Recommended discharge distance:
Spark Energy:
(12) Available only for gas versions.
(13) Value measured with a 30 pF load.
(14) ATTENTION: The ignition device output is not safe to touch if the
Fig. 2 – Ignition transformer connections
spark repetition frequency is higher than 25Hz; in this case installation must be provided with further protection. IMPORTANT NOTE
! In order to further reduce tradio interference and increase the controller immunity it's strongly recommended to insert a wire-
wound power resistor with a value between 1kΩ e 4.7kΩ between
The plastic case (and the PCB painting if requested) protect the the high voltage cables and the related discharge electrodes. controller against mechanical damage caused by crash, tempering , dust , and contact with external ambient. Strain relieves, a sufficient number of earth terminals and neutral Thanks to a surface mounting components (which constitutes the terminals should be provided in the appliance or in external "logic nucleus" of the system) and to the use of an innovative connection boxes. patented circuit of ours that generates the ignition discharge
The control systems types DTMN…/DTEN… are provided with the reducing to the minimum the emitted EMC, have allowed to reduce possibility to be connected to a safety thermostat TS (as shown in the dimensions of the controller PCB. So that even the most Fig.3) which interrupts the EV1 gas valve power supply and causes complicated version takes a very limited space. a safety lockout after a delay which is the sum of waiting (or pre- A varistor protects the controller from peak tensions on the mains purge) and safety times. If a self-resetting safety thermostat is supply due to, for instance, atmospheric discharges such as applied (a condition existing exclusively in the manual rest thunderbolts. An internal accessible fuse protects the controller controllers), the restoration time of this thermostat in the appliance relays in case of short circuit on the outputs (valves, fan and must be longer than the total time needed for the maximum lockout signal). allowed number of re-ignition attempts in order to reach lockout. 10964_r02 Installation directions
− The controllers are safety devices; guarantee and responsibility of the manufacturer will be debarred if the products are tempered with by the user; − The system is designed to stay in running position for less than 24h (system for non-permanent operation). Reaching this limit causes a regulation shutdown in order to allow the controller to check its efficiency.; − The controller must be connected and disconnected without − The controller can be mounted in any position; Fig. 3 – Safety thermostat connection
− Avoid exposure to dripping water; − A ventilated installation ambient and a quite low temperature Standard accessories
ensure the longest life of the controller; The control systems are usually supplied with a kit of female − Before installing or replacing the controller make sure that its connectors and/or a reset button (see Fig.2). type, code and times are those required; Do not fit terminals and female connectors of different types. − The appliance in which the controllers are installed must provide adequate protection against the risk of electric shock
Electrical installation
− The applicable national regulation and European standards
(Ex. EN 60335-1/ EN 50165) related to the electrical safety must be respected; − The gas versions, supplied with detection electrode, can be equipped with a polarity recognition. Not respecting the phase-neutral polarity causes a non-volatile lockout at the end of the safety time ; Before starting the system check the wiring carefully. Wrong connections can damage the controller and compromise safety; − The earth terminal of the controller, the metal frame of the burner and the earth on the mains supply must be well connected; − Avoid putting the detection cable close to power or ignition Use a heat resistant detection electrode well insulated to ground and protected from possible moisture (or water in Fig. 4 – Standard accessories
− Use an ignition cable as short and straight as possible and keep it far from other conductors to reduce the EMC emission The following figure shows the various types of flame sensors (max. length< 2m and insulation voltage >25 kV). produced by BRAHMA and employable in the oil appliances. In case of live-neutral networks with unearthed neutral or live-live network (with star center not earthed) the controller can operate FC13-FC14 drilling plane FC11 drilling plane correctly by means of a built-in resistor.
In the gas versions and in case of a "partial" short circuit or
dispersion between phase and earth, the tension on the detection
electrode can be reduced till causing lockout of the controller due
to impossibility of detecting the flame signal.
Checking at start
Check the controller before the first star-up, after every overhaul
and after a long period of non operation.
Before any ignition attempt make sure that the combustion
chamber is free from gas, then make sure that:
− If the start-up attempt occurs without gas supply the controller
goes to lockout at the end of safety time ; − When gas flow is interrupted (while the controller is in running state) the power supply to gas valves is interrupted within 1 second and the controller proceeds to lockout after a recycle (or more than one recycle up to max. 10 according to the − Operating times and cycle are in compliance with the ones declared for the used controller type; Fig. 5 – fixing systems of FC1(1-3-4) sensors
10964_r02 − The level of the flame signal is sufficient (see Fig. 7 and Fig. 8 Flame failure during the safety time causes the ignition device to for the measuring method to be adapted in case of controllers be activated within 1 second. for gas and oil appliances respectively); See cycle diagram to better understand the operation of each − The ignition electrodes are adjusted in the most stable way for a 2-4 mm air spark gap; − The intervention of regulators, limiters or safety devices causes OIL versions - Operation
a shut down of the controller according to the application type. The following description refers to the standard operation cycle At every start the controller proceeds to a self-checking of its own components. When the room thermostat is closet the preheter is energized immediately; once the correct oil temperature is obtained the preheater thermostat switches and signals the start of the ignition cycle to the controller: the burner motor and the ignition transformer are energized ( Pre-purge time TP and pre-ignition time) and the operation of the flame amplifier is checked. Any fault leading to a spurious flame signal prevents the controller from starting which causes a lockout within 10 seconds. In case the preheater thermostat opens during pre-purge time, the controller deactivates the motor fan and the ignition transformer and proceeds to the waiting position. This condition remains till the Fig. 7 – Flame signal measurement method in gas
preheater thermostat closes again; conversely the controller goes versions.
to lockout within 10 minutes. At the end of pre-purge time TP, the safety time begins and the ! IMPORTANT NOTE
controller energizes the EV1 valve. If no flame is detected within The measurement of the ionization current can be effected the end of safety time TS, then the controller goes to lockout and exclusively in the controllers configured for dual electrode. de-energizes the motor fan, the ignition transformer and especially In controllers configured for single electrode it's dangerous for the the EV1 valve while the lockout signal is activated. Conversely, at user to insert a measurement instrument in series with the detection the end of the safety time TS the ignition transformer is deactivated and the second stage valve EV2 is energized. Terminal J5
See cycle diagram to better understand the operation of each
controller.

Operation cycle variation
The possible cycle variations of the controllers are as follows:
− Option 6 ("A", "B"): ignition mode
V< 0,8VDC
The spark can be activated during all the safety time TS (option "A") or deactivated immediately when a flame signal is detected (Option "B"). − Option 9 ("C3", "C4", "C5"): BRAHMA modulating valve type VCM0x with soft-start function The soft-start function allows the controller to control the value of the valve supply current avoiding the maximum opening of the Terminal J6 – Neutral
valve during ignition (option "C3"), during ignition and the delay time for the attainment of the second range value (option "C4) or Fig. 8 – Flame signal measurement method in oil
during ignition, the delay time for the attainment of the second versions.
range value and the operational state (option "C5") . − Option 11 ("X", "Wnn"): opening mode of the second stage GAS versions - Operation
valve EV2 or of the auxiliary fan The following description refers to the standard operation cycle The second stage valve or the auxiliary fan can be energized at the end of the safety time (options "X") or with a delay (expressed At every start the controller proceeds to a self-checking of its own in seconds) settable upon request (option "Wnn"). components. During waiting time (TW) or pre-purge time (TP) the − Option 12 ("K", "Knn"): internal circuit monitors the correct functioning of the flame signal If a spurious flame is detected at start-up or during safety/prepurge amplifier: A spurious flame signal or a fault in the amplifier which time, the controller proceeds to immediate lockout (option "K") or corresponds to the flame condition prevent the controller from with a delay (expressed in seconds) settable upon request (option In the types provided with fan control, before pre-purge time starts, − Option 13 ("Qnn"): failure or insufficiency of air flow at start-up the controller checks the air pressure switch contacts to ensure a (GAS versions) or preheater thermostat failure to close (OIL 'no air-flow' condition. Only if the test is positive the pre-purge time versions) (TP) starts due to the commutation of the air pressure switch. The controller locks out within 3÷120 seconds (the time is settable At the end of the waiting (TW) or pre-purge time (TP) the EV1 upon request) if insufficient or no air flow is found or if the valve and ignition device are energised and the safety time begins preheater thermostat fails to switch during waiting/pre-purge time). − Option 14 ("S", "Snn"): failure or insufficiency of air flow (GAS If flame is detected during the safety time the ignition device is de- versions) or preheater thermostat failure to open (OIL versions) energised and, in the models where it is provided, the main gas in running position valve EV2 energized. Conversely, if no flame is detected during the − In case of air flow failure ( GAS versions) or preheater safety time then at the end of the same the controller proceeds to thermostat failure to open (OIL versions) in operational state, lockout, the EV1 valve is closed, the ignition device is de-energised the controller goes to lockout immediately (option "S") or after and the lockout signal is activated. "nn" number of events (option "Snn"). 10964_r02 − Option 15 ( "V", "Vnn"): Flame failure in running position Controller reset
In case of flame failure in operational state, the controller proceeds Non-volatile lockout (manual reset) to lockout immediately (option "V") or after "nn" number of events When the controller goes to a non-volatile lockout, in order to reset the system the reset button must be pressed till the lockout signal − Option 17 ("Pnn", "PTnn"): post-purge time on the main combustion motor fan A post-purge action on the main combustion motor fan is effected Volatile lockout (electrical reset) (the time is settable upon request). In case of a volatile lockout the controller can be reset by With option "Pnn" post-purge is effected regardless of heating interrupting and then restoring the power supply. It's not possible to demand; conversely, with option "PTnn" post-purge can be reset the system by shutting off the heating demand device. interrupted by the heating demand restoration and consequently the controller goes to an ignition recycle. Communication interface
− Option 18 ("Onn"): post-purge time on the auxiliary motor In case option no. 26 ("U") is required, the ignition and flame A 1 to 500 s post-purge action on the auxiliary fan is effected (the monitoring device can send and receive data according to a low time is settable upon request). This option can be implemented speed communication protocol developed by BRAHMA S.p.A . only in the controllers provided with auxiliary fan management The main function of this communication protocol is diagnosing the controller status and setting the modulation parameters in case − Option 19 ("Ynn"): recycle attempts the BRAHMA modulating valve type VCM0x is employed. The controller effects multiple recycle attempts after lockout (the attempts number is settable upon request). − Option 20 ("Dnn"): recycle attempts due to ignition or flame failure in running position The controller makes "nn" number of recycles due to ignition failure at the end of safety time or to flame failure in running position. − Option 21 ("Inn"): inter-waiting or inter-purge time DMNxx controller
A waiting or pre-purge time (expressed in seconds) starts after a failed ignition attempt and before the next recycle attempt. − Option 23 ("G"): Air pressure switch or preheater thermostat The controller starts its ignition cycle without checking the air pressure switch (in the gas versions) or the preheater thermostat Low-profile connector for (in the oil versions). the connection to user − Option 24 ("Jnn"): pre-ignition time The transformer is activated at the end of the waiting/purge time and before the beginning of the safety time (time is settable upon request. NOTE: in the OIL versions the pre-ignition time coincides with the pre-purge time . N Output digital signal Input digital signal Fig. 9 – Connection diagram between BRAHMA DMN controller
and the related interface board
10964_r02 CONTROLS DENOMINATION
D (1) (2) N (3) (4) (5)
(6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21) (22) (23) (24) (25) (26) (27) (28)
Type description
(1)
Safety thermostat (ST)
No letter:
Safety thermostat not available. Standard mode With safety thermostat Type lockout
M:
Non –volatile lockout Volatile lockout Combustion motor fan
1:
Intermittent first stage Ignition transformer – Controller version (GAS - OIL)
No letter:
Controller for GAS applications – Integrated ignition transformer. This is the standard mode Remote electronic ignition transformer. Controller for OIL applications – Remote electronic ignition transformer
Options description
(6)
Ignition mode
No letter:
Ignition spark operates for TSP time (TS-1). Standard mode Ignition spark operates for TS Ignition spark is switched off when flame presence is detected Note: Options "A" and "B" are available in dual-electrode version (separate ignition and detection electrodes)only.
Peak ignition voltage of the integrated transformer (GAS version only)
No letter:
15 kV. Standard mode Spark frequency of the ignition transformer
No number:
25 Hz. Standard mode See "Ignition transformer" in TECHNICAL DATA paragraph First stage gas valve EV1
No letter:
Standard valve in alternate current. Standard mode 230VDC valve with an embodied rectification bridge (Graetz) and a protection resistor against peak current BRAHMA valve type VCM0x BRAHMA valve type VCM0x with soft-start current control during the safety cycle time BRAHMA valve type VCM0x with soft-start current control during the safety cycle time and soft-start current control during a waiting time before passing to the max power. BRAHMA valve type VCM0x with soft-start current control during the safety cycle time, during the waiting time and during the running position. Generic 230VDC valve : possibility to drive it by means of an in-built modulator circuit Note: The soft start function allows to control the modulation current value in order to check if it remains within a specific gap. This control permits
to check if any circuital fault is present in the controller. In case the controller detects a modulation current value outside of the specific gap, it goes to the lockout condition. (10) First stage gas valve EV1 series BRAHMA type VCM0x – Working feature
Not available. Standard mode 1 gas valve used for intermittent first stage (see "TECHNICAL DATA" and "OPERATION CYCLE" paragraph) 1 gas valve used for slow opening application (see "TECHNICAL DATA" and "OPERATION CYCLE" paragraph) 2 gas valves used for intermittent first stage (see "TECHNICAL DATA" and "OPERATION CYCLE" paragraph) 2 gas valves used for slow opening application (see "TECHNICAL DATA" and "OPERATION CYCLE" paragraph) (11) Opening of the second stage gas valve EV2 or the auxiliary combustion motor when the flame is present
No delay time . Standard mode At the end of the TS time With delay if requested (see "TECHNICAL DATA" paragraph) Nota: Options "X" and "Wnn" (in case of the second stage gas valve EV2) are available only in dual electrodes configuration (sparking electrode
and ionization electrode are separated). (12) Lockout for flame simulation
Not available (the control remains in continuous waiting/pre-purge state). Standard mode Lockout condition Lockout condition with delay if requested (see "TECHNICAL DATA" paragraph) (13) No or insufficient air flow at starting (gas versions); no switching of the thermostat TC at starting (oil versions)
The controller remains in stand-by condition (gas version); or proceeds to lockout condition after 10 min from the starting cycle (oil version). Standard mode Lockout condition with delay if requested (see "TECHNICAL DATA" paragraph) 10964_r02 Options description
(14) No or insufficient air flow (gas versions) at running or thermostat TC opening (oil versions) at running
Safety shutdown followed by stand-by condition. Standard mode Lockout condition without delay The controller proceeds to the lockout condition after a certain number "nn" of air pressure switch failures or preheater thermostat failures in running position. (15) Flame failure at running
Recycling. Standard mode Lockout condition without delay The controller goes to lockout condition after a "nn" number of losing flame signal from running position. (see "TECHNICAL DATA" paragraph) (16) Connection to the mains supply (available for GAS versions only)
Live-neutral polarized (phase sensitive control). Standard mode (17) Post-purge of the main motor fan
No post-purge. Standard mode The post-purge time is set if requested (see "TECHNICAL DATA" paragraph) and it cannot be interrupted by the heating demand restoration The post-purge time is set if requested (see "TECHNICAL DATA" paragraph) and it can be interrupted by the heating demand restoration (18) Post-purge of the auxiliary motor (with option "T1" only)
No post-purge. Standard mode The post-purge time is set if requested (see "TECHNICAL DATA" paragraph) and it cannot be interrupted by the heating demand restoration (19) Recycle attempts due to ignition failure
Single ignition cycle after a controller shut down. Standard mode Multiple recycle attempts if requested (see "TECHNICAL DATA" paragraph) (20) Recycle attempts due to ignition or flame failure in running position
No recycle attempts due to ignition failure and no recycle attempts due to flame failure in running state, are independent from each other. Standard mode Number of recycle attempts due to ignition failure and number of recycle attempts due to flame failure in running state , are dependent from each other. (21) Inter-waiting or inter-purge time
No inter-waiting or inter-purge time. Standard mode The inter-waiting/inter-purge time is set if requested (see "TECHNICAL DATA" paragraph) (22) Lockout indicator output
High voltage output without any protection against cabling mistakes of the reset push button. Standard mode Presence of a internal resistor to protect the reset push button against the inversion of its connections Output for lockout signals with current higher than 50mA (23) Checking of the air pressure switch for gas versions or the preheater thermostat for oil versions
Checking of the air pressure switch or the preheater thermostat. Standard mode Without checking of the air pressure switch or the preheater thermostat Note: controls with option "G" are intended for special applications where a check of the air flow is not required by the standard appliance.
(24) Pre-ignition
Without pre-ignition. Standard mode The pre-ignition time is set if requested (see "TECHNICAL DATA" paragraph) Note: Option "J" is available in dual electrodes version only (separate ignition and ionization electrodes).
(25) User interface
No user interface. Standard mode Presence of the user interface module type BRAHMA (see "TECHNICAL DATA" paragraph) * Note:
Letter "n" represents the reference number of the user interface. More details are available in user interface module of DMN controller data sheet. (26) Second stage valve EV2 output – Auxiliary combustion motor fan – Auxiliary contact
Second stage gas valve EV2 output (intermittent pilot appliances). Standard mode Auxiliary combustion motor fan output No auxiliary contact (this contact is not isolated from the main supply voltage by reinforced isolation, therefore it not suitable to control SELV circuits – Safety Extra Low Voltage, e.g. 24V) 10964_r02 WIRING DIAGRAMS
The wiring diagrams below show the most complete versions of the controller. It is easy to understand which parts can be present or absent according to the different options requested. Type DTMN32 in dual electrodes mode
Type DTMN32 in mono-electrode mode
Type DTMN32PR
Type DTMN32O
FUSE
MAIN SWITCH
ROOM THERMOSTAT
AIR PRESSURE
REMOTE RESET
LOCK-OUT SIGNAL
FAN
FIRST STAGE GAS
SECOND STAGE GAS
NOTES
1) In the versions without fan motor (DMN11, DEN12,…) J2 connector is not present.
2) Controllers with option "U" connected to a BRAHMA interface with the function as a room thermostat , the thermostat T must be short- 3) Reset push button is not wired in an electrical reset device. 10964_r02 4) In the versions fitted with "T1" option (with auxiliary fan) the second gas valve symbol is replaced by the auxiliary fan In the devices fitted with "T2" option (with NO auxiliary contact) there is not a second gas valve symbol and pin n°. 18 and 19 are represented by abbreviations "C" (COMMON) and "NA" (NORMAL OPEN). 5) In the versions without safety thermostat TS, the connection is not available. 6) In the versions without option "U" (interface module BRAHMA type 807) the connector J8 is not available. 7) In case of the preheater is absent , TC thermostat must be short circuited by means of an external bridge. Notes to dispose the device
Containing electronic components, the control unit cannot be dispose as a domestic rubbish. For a correct disposing of the device, it is necessary to consult the local references concerning the special rubbishes. 10964_r02 OPERATING CYCLES
STANDARD VERSIONS WITHOUT SAFETY THERMOSTAT
DMN11 - DEN11
DMN12 - DEN12
DMN31 - DEN31 - DMN31O - DEN31O
DMN32 - DEN32 - DMN32O - DEN32O
STANDARD VERSIONS WITH SAFETY THERMOSTAT
DTMN11 - DTEN11
DTMN12 - DTEN12
DTMN31 - DTEN31 - DTMN31O - DTEN31O
DTMN32 - DTEN32 - DTMN32O - DTEN32O
THERMOSTAT FAN AIR PRESSURE IGNITION FLAME LOCK-OUT FIRST STAGE SECOND STAGE SAFETY PREHEATER SWITCH TRANSFORMER SIGNAL SIGNAL GAS VALVE GAS VALVE THERMOSTAT Note 1: in case of controller for oil appliances, the ignitor transformer is supplied during the entire prepurge time TP.
10964_r02 AVAILABLE OPTIONS
OPTION Q – No or
OPTION Q – No restoration of
insufficient air flow
the air pressure switch

RECYCLE AVAILABLE FROM 1 TO 10 OPTIONS Y
NOTE
1. Lock-out condition with delay available.
2. Inter-waiting or inter-purge time available.
As a special setting the waiting/pre-purge time between each recycling attempt may be replaced by an inter-waiting/inter-purge time, if this sequence is allowed by final appliance. 3. Pre –ignition time available. In the oil versions the pre-ignition time and the pre-purge time are the same. 4. Second stage ignition delay time available. THERMOSTAT FAN AIR PRESSURE IGNITION FLAME LOCK-OUT FIRST STAGE SECOND STAGE SAFETY PREHEATER SWITCH TRANSFORMER SIGNAL SIGNAL GAS VALVE GAS VALVE THERMOSTAT THERMOSTAT 10964_r02 AVAILABLE
STANDARD VERSION WITHOUT SAFETY THERMOSTAT
-- 2° level
-- 1° level
DMN31 – DEN31
DMN32 – DEN32
OPTION M1 - M3
STANDARD VERSIONS WITHOUT SAFETY THERMOSTAT
-- 2°level
-- 1° level
DTMN31 – DTEN31
DTMN32 – DTEN32
OPTION M2 - M4
OPTION P (NOTE 1)
OPTION PT
NOTE
1. The same behaviour is for the auxiliary cross flow fan in case of option "Onn".
2. The timing to pass from the first modulating level to the second one, is settable upon request.
THERMOSTAT FAN AIR PRESSURE IGNITION FLAME LOCK-OUT FIRST SECOND SAFETY PREHEATER AUXILIARY SWITCH TRANSFORMER SIGNAL SIGNAL STAGE STAGE THERMOSTAT THERMOSTAT MOTOR > CompanATTENTION -> Company Brahma S.p.A. declines any responsibility for any damage resulting from the Customer's interfering with the device
BRAHMA S.p.A.
Via del Pontiere, 31
37045 Legnago (VR)
Tel. +39 0442 635211 - Telefax +39 0442 25683
2011/06/07 Subject to amendments without notice http://www.brahma.it E-mail : [email protected] 10964_r02

Source: http://www.shigas.ir/en/PDF/brahma/iaf/ds_02.pdf