Siemens LMO14 Series User manual

CC1N7130en

15.10.2002

Siemens Building Technologies

HVAC Products

ISO 9001

7130

Oil Burner Controls LMO14...

LMO24...

LMO44...

Microcontroller-based oil burner controls for the startup, supervision and control

of forced draft oil burners in intermittent operation. Standard versions with an oil

throughput up to 30 kg / h, special versions above 30 kg / h.

The LMO14..., LMO24..., LMO44... and this Data Sheet are intended for use by

OEMs which integrate the burner controls in their products.

Use, features

The LMO... are designed for the startup and supervision of single- or 2-stage forced

draft oil burners in intermittent operation. Yellow-burning flames are supervised with

photoresistive detectors QRB..., blue-burning flames with blue-flame detectors QRC...

In terms of housing dimensions, electrical connections and flame detectors, the LMO...

are identical with the LOA... oil burner controls.

- Oil burners with fans to EN 267

- Burner controls for use with atomization oil burners of monoblock design to EN 230

- LMO44... for use with stationary direct-fired air heaters

- Undervoltage detection

- Electrical remote reset

- Bridging contact for oil preheater

- Monitoring of time for oil preheater

- Accurate and reproducible control sequence through digital signal handling

- Controlled intermittent operation after 24 hours of continuous operation

- Limitation of the number of repetitions

- Multicolor indication of fault and operational status messages

Use

General features

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HVAC Products 15.10.2002

Warning notes

To avoid injury to persons, damage to property or the environment, the following

warning notes should be observed!

Do not open, interfere with or modify the unit!

·Before performing any wiring changes in the connection area of the LMO..., com-

pletely isolate the burner control from the mains supply (all-polar disconnection)

·Ensure protection against electric shock hazard by providing adequate protection

for the burner control’s connection terminals

·Check to ensure that wiring is in an orderly state and that the wires are firmly con-

nected

·Press the lockout reset button / operation button only manually (applying a force of

no more than 10 N), without using any tools or pointed objects

·Fall or shock can adversely affect the safety functions. Such units may not be put

into operation, even if they do not exhibit any damage

·When replacing LOA26... or LOA36..., any remote lockout reset module ARK21...

or similar modules contained in the burner or boiler must be removed

Mounting notes

·Ensure that the relevant national safety regulations are complied with

Installation notes

·Installation work must be carried out by qualified staff

·Always run the high-voltage ignition cables separately while observing the greatest

possible distances to the unit and to other cables

·Install switches, fuses, earthing, etc., in compliance with local regulations

·Ensure that the maximum permissible amperages will not be exceeded (refer to

«Technical data»)

·Do not feed external mains voltage to the control outputs of the unit. When testing

the components controlled by the burner control (fuel valves, etc.), the LMO... may

never be plugged in

·Do not mix up live and neutral conductors

Electrical connections of the flame detectors

It is important to achieve practically disturbance- and loss-free signal transmission:

·Never run the detector cable together with other cables

– Line capacitance reduces the magnitude of the flame signal

– Use a separate cable

·Observe the maximum permissible lengths of the detector cables (refer to «Techni-

cal data»)

ARK21...

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Commissioning notes

·Commissioning work must be carried out by qualified staff

·When commissioning the plant or when doing maintenance work, make the follow-

ing safety checks:

Safety check Anticipated response

a) Burner startup with flame detector dark-

ened

Lockout at the end of «TSA»

b) Burner startup with flame detector ex-

posed to extraneous light

Lockout after 40 seconds at the

latest

c) Burner operation with simulated loss of

flame; for that purpose, darken the flame

detector during operation and maintain

that state

Repetition followed by lockout at

the end of «TSA»

Norms and standards

Conformity to EEC directives

- Electromagnetic compatibility EMC (immunity) 89 / 336 EEC

- Low-voltage directive 73 / 23 EEC

Service notes

·Maintenance work must be carried out by qualified staff

·Each time a unit has been replaced, check to ensure that wiring is in an orderly

state and that the wires are firmly connected. Make the safety checks as detailed in

«Commissioning notes»

·Use the service adapters KF8885 / KF8833 / KF8840 for only short periods of time

Disposal notes

The unit contains electrical and electronic components and may not be disposed of

together with household waste.

Local and currently valid legislation must be observed.

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Mechanical design

The housing is made of impact-proof, heat-resistant and flame-retarding plastic.

It is of plug-in design and engages audibly in the base.

The housing accommodates the

- microcontroller, which controls the control sequence, and the control relays for load

control

- electronic flame signal amplifier

- lockout reset button with its integrated 3-color signal lamp for operational status

and error messages and the socket for connecting the interface adapter OCI400

- Multicolor indication of operational status and error messages

- Transmission of operational status and error messages and detailed service infor-

mation through additional interface adapter OCI400 and PC Windows software

ACS400

Type summary

¹) Remote

reset

Times Comparable

type of

LOA...

Type reference Mains

voltage

Fuel

valve

stages

Burner

capacity

max.

t1 / t1´

min.

TSA-

max.

min.

t3n

max.

min.

Standard versions

LMO14.111B2 AC 230 V 1 < 30 kg / h ··5 s 15 / 16 s 10 s 15 s 10 s --- LOA24.171B27

LOA26.171B27

LOA36.171A27

LMO14.111B1 AC 110 V 1 < 30 kg / h ··5 s 15 / 16 s 10 s 15 s 10 s --- LOA24.171B17

LMO14.113B2 AC 230 V 1 < 30 kg / h ··5 s 15 / 16 s 10 s 15 s 3 s --- LOA24.173A27

LMO24.111B2 AC 230 V 2 < 30 kg / h ··5 s 15 / 16 s 10 s 15 s 10 s 15 s LOA24.171B27

LOA26.171B27

LOA36.171A27

LMO24.111B1 AC 110 V 2 < 30 kg / h ··5 s 15 / 16 s 10 s 15 s 10 s 15 s LOA24.171B17

LMO24.113B2 AC 230 V 2 < 30 kg / h ··5 s 15 / 16 s 10 s 15 s 3 s 15 s LOA24.173A27

LMO24.255B2 AC 230 V 2 </> 30 kg/h ··5 s 25 / 26 s 5 s 25 s 5 s 15 s ---

Version for flash-steam generators

LMO24.011B2 AC 230 V 2 < 30 kg / h ··5 s 5 / 6 s 10 s 5 s 10 s 15 s LOA24.571C27

Suited for direct-fired air heaters

LMO44.255B2 AC 230 V 2 </> 30kg / h ··5 s 25 / 26 s 5 s 25 s 5 s 5 s LOA44.252A27

TSAmax. Maximum ignition safety time

tw Waiting time

t1 Prepurge time

t1’ Purge time

t3 Preignition time

t3n Postignition time

t4 Interval from flame signal to release of «BV2»

¹) Bridging contact for oil preheater

Indication and diagnosis

Legend

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Ordering

Oil burner control (without plug-in base) refer to «Type summary»

Electrical connections refer to Data Sheet 7201

- Plug-in base AGK11...

- Cable holders AGK65..., AGK66, AGK67...

- Cable strain relief elements for AGK67...

Electrical connections refer to Data Sheet 7203

- Plug-in base AGK13...

- Plug-in housung AGK56...

- Cover AGK68...

Flame detectors

- Photoresistive detectors QRB1... refer to Data Sheet 7714

- Blue-flame detector QRC1... refer to Data Sheet 7716

Diagnostic tool refer to Data Sheet 7614

- Interface adapter OCI400

- PC Windows software ACS400

Demo case KF8891

- For demonstrating the functions of burner controls

(refer to User Manual B7989)

Test case KF8843

- For checking the functions of burner controls

(refer to Operating Instructions C7981)

Test adapter KF8885

- For checking the functions of burner controls on the burner

- With switch for manual startup of the burner

- With switch for simulating the oil preheater’s release contact

- With 2 pairs of jacks for measuring the flame detector current

(refer to Operating Instructions C7986)

Test adapter KF8833

- For checking the functions of burner controls on the burner

- With signal lamps for program indication

- With one pair of jacks for measuring the flame detector current

Test adapter KF8840

- For checking the functions of burner controls on the burner

- With signal lamps for program indication

- With on / off switch for simulating the flame signal

- With holes for checking the control voltages at the tabs of the burner control

- With one pair of jacks for measuring the flame detector’s resistance

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Technical data

Mains voltage AC 230 V +10 % / -15 %

AC 110 V +10 % / -15 %

Mains frequency 50...60 Hz ±6 %

External primary fuse (Si) 6.3 A (slow)

Power consumption 12 VA

Mounting orientation optional

Weight approx. 200 g

Safety class I

Degree of protection IP 40 (to be ensured through mounting)

Perm. cable lengths max. 3 m at a line capacitance of 100 pF/m

Detector cable laid separately 20 m

Remote reset laid sepatately 20 m

Max. perm. amperage at cos j³0.6 LMO14... LMO24... / LMO44...

Terminal 1 5 A 5 A

Terminals 3 and 8 3 A 5 A

Terminals 4, 5, 6 and 10 1 A 1 A

Transport DIN EN 60 721-3-2

Climatic conditions class 2K2

Mechanical conditions class 2M2

Temperature range -30...+70 °C

Humidity < 95 % r.h.

Operation DIN EN 60 721-3-3

Climatic conditions class 3K5

Mechanical conditions class 3M2

Temperature range

- LMO14... / LMO24...

- LMO44...

-5...+60 °C

-20...+60 °C

Humidity < 95 % r.h.

Condensation, formation of ice and ingress of water are not permitted!

Min. detector current

required

(with flame)

Max. perm. detector

current

(without flame)

Max. possible detector

current with flame

(typically)

QRB... 45 µA 5.5 µA 100 µA

QRC... 70 µA 5.5 µA 100 µA

The values given in the table above only apply under the following conditions:

- Mains voltage AC 230 V

- Ambient temperature 23 °C

Detector current in operation:

- Flame signal instable

- Green LED flashing

Detector current in operation:

- Flame signal stable

- Green LED steady on

QRB... < 45 µA > 45 µA

QRC... < 45 µA > 45 µA

The values given in the table above only apply under the following conditions:

- Mains voltage AC 230 V

- Ambient temperature 23 °C

General unit data

Environmental

conditions

Flame supervision with

QRB... and QRC...

Green LED for opera-

tional status indication

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QRB... QRC...

11 LMO...

µA DC

QRB...

7130v01/0700

11 LMO...

swbl br

µA DC

QRC1...

7130v02/0700

Legend

µA DC DC microammeter

with an internal

resistance of

Ri = max. 5 kW

bl Blue

sw Black

br Brown

As an alternative to detector current measurement, the diagnostic tool OCI400 /

ACS400 can be used. In that case, connection of a DC microammeter is not required.

Measuring circuit

for detector current

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Function

·Burner control is reset

·All contacts in the line are closed and there is demand for heat

·No undervoltage

·Flame detector is darkened and there is no extraneous light

·Safety shutdown in the operating position takes place should mains voltage drop

below about AC 165 V (UN= AC 230 V)

·Restart is initiated when mains voltage exceeds about AC 175 V (UN= AC 230 V)

If the oil preheater’s release contact does not close within 10 minutes, the burner control

will initiate lockout.

After 24 hours of continuous operation at the latest, the burner control will initiate auto-

matic controlled shutdown followed by a restart.

If lockout occurs, the outputs for the fuel valves, burner motor and ignition equipment

will immediately be deactivated (< 1 second).

Cause Response

Mains failure Restart

Voltage has fallen below the undervoltage

threshold

Restart

Extraneous light during «t1» Lockout at the end of «t1»

Extraneous light during «tw» Prevention of startup, lockout after 40 sec-

onds at the latest

No flame at the end of «TSA» Lockout at the end of «TSA»

Loss of flame during operation Max. 3 repetitions, followed by lockout

Oil preheater’s release contact does not

close within 10 minutes

Lockout

In the event of lockout, the LMO... remains locked and the red signal lampLED will light

up. The burner control can immediately be reset.

This state is also maintained in the case of mains failure.

Whenever lockout occurs, the burner control can immediately be reset. To do this, press

the lockout reset button for about 1 second (< 3 seconds).

If the flame is lost during «TSA», the burner will be reignited, but only until the end of

«TSAmax».

This means that several ignition attempts can be made during «TSA» (refer to «Control

sequence»).

If the flame is lost during operation, a maximum of 3 repetitions can be made.

If the flame is lost for the fourth time during operation, the burner will initiate lockout.

The repetition count is restarted each time controlled switching on by «R-W-SB» takes

place.

Preconditions for

startup

Undervoltage

Time supervision

oil preheater

Controlled intermittent

operation

Control sequence in

the event of fault

Resetting the

burner control

Ignition program with

LMO14.113B2 and

LMO24.113B2

Limitation of repetitions

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Operation, display, diagnosis

7130z05/0700

Lockout reset button «EK...» is the key operating element for resetting

the burner control and for activating / deactivating the diagnostic func-

tions.

LED

7130z06e/0700

Red

Yellow

Green

The multicolor LED in the lockout reset button is the key indicating

element for both visual diagnostics and interface diagnostics.

Both «EK...» and LED are located under the transparent cover of the lockout reset

button.

There are 2 diagnostic choices:

1. Visual diagnostics: Operational status indication or diagnostics of the cause of

fault.

2. Interface diagnostics: With the help of the interface adapter OCI400 and PC soft-

ware ACS400 or flue gas analyzers of different makes (refer to Data Sheet 7614).

Visual diagnostics:

In normal operation, the different operational statuses are indicated in the form of color

codes according to the color code table. The interface diagnostics is activated by

pressing the lockout reset button for at least 3 seconds (refer to Data Sheet 7614). If,

by accident, the interface diagnostics has been activated, in which case the slightly red

light of the signal lamp LED flickers, it can be deactivated by pressing again the lockout

reset button for at least 3 seconds. The moment of switching over is indicated by a

yellow light pulse.

Operating position

> 3 s

Interface diagnostics

PC / analyzer

7130z01e/0602

Visual diagnostics

xxxxxxx x

Color code table

Operating position

During startup, status indication takes place according to the following table:

Color code table for multicolor signal lamp LED

Status Color code Color

Waiting time «tw», other waiting states ❍...................................... Off

Oil preheater on, waiting time «tw» ●....................................... Yellow

Ignition phase, ignition controlled ●❍●❍●❍●❍●❍Flashing yellow

Operation, flame o.k. ❏....................................... Green

Operation, flame not o.k. ❏❍❏❍❏❍❏❍❏❍Flashing green

Extraneous light on burner startup ❏s❏s❏s❏s❏Green-red

Undervoltage ●s●s●s●s●sYellow-red

Fault, alarm s....................................... Red

Error code output (refer to «Error code

table»)

s❍s❍s❍s❍Flashing red

Interface diagnostics ssssssssRed flicker light

...... Steady on sRed

❍Off ●Yellow

❏Green

Operation

Operational status

indication

Legend

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HVAC Products 15.10.2002

After lockout, the red fault signal lamp LED remains steady on.

In that condition, the visual diagnostics of the cause of fault according to the error code

table can be activated by pressing the lockout reset button for more than 3 seconds.

Pressing the reset button again for at least 3 seconds, the interface diagnostics will be

activated (for more detailed information, refer to Data Sheet 7614).

The following sequence activates the diagnostics of the cause of fault:

> 3 s

Flashing

xxxx xxx x

Error code table

> 3 s

Interface diagnostics

PC / analyzer

OCI400

< 3 s

7130z04e/0602

Reset

Visual diagnostics

Lockout position Lockout position Lockout position

Error code table

Red blink code of

signal lamp (LED)

«AL» at

term. 10

Possible cause

2 blinks

On No establishment of flame at the end of «TSA»

- Faulty or soiled fuel valves

- Faulty or soiled flame detector

- Poor adjustment of burner, no fuel

- Faulty ignition equipment

3 blinks

hhh

On Free

4 blinks

hhhh

On Extraneous light on burner startup

5 blinks

hhhhh

On Free

6 blinks

hhhhhh

On Free

7 blinks

hhhhhhh

On Too many losses of flame during operation (limi-

tation of the number of repetitions)

- Faulty or soiled fuel valves

- Faulty or soiled flame detector

- Poor adjustment of burner

8 blinks

hhhhhhhh

On Time supervision oil preheater

9 blinks

hhhhhhhhh

On Free

10 blinks

hhhhhhhhhh

Off Wiring fault or internal fault, output contacts

During the time the cause of fault is diagnosed, the control outputs are deactivated.

- Burner remains shut down

- Fault status signal «AL» at terminal 10, according to the error code table

The diagnostics of the cause of fault is quit and the burner switched on again by reset-

ting the burner control. Press the lockout reset button for about 1 second (< 3 seconds).

Diagnostics of the

cause of fault

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