Unigas N18, Manual For Installation, Operation And Maintenance

LMO24 - LMO44

Key

AL

Alarm device

kbr... Cable link (required only when no oil pre-heater is used)
BV... Fuel valve
EK1

Lock-out reset button

EK2

Remote lock-out reset button

FS

Flame signal

FSV Flame signal amplifier
K...

Contacts of control relay

LED 3-colour signal lamps
M

Burner motor

OW

Release contact of oil pre-heater

t1

Pre-purge time

t3

Pre-ignition time

t3n

Post-ignition time

A´

Beginning of start-up sequence with burners using an oil pre-
heater

A

Beginning of start-up sequence with burners using no oil pre-
heater
Controller output signals
Required input signals

OH

Oil pre-heater

QRB Photoresistive detector
QRC Blue-flame detector
bl = blue
br = brown
sw = black
R

Control thermostat or pressurestat

SB

Safety limit thermostat

Si

External primary fuse

W

Limit thermostat or pressure switch

Z

Ignition transformer

t4

Interval from flame signal to release «BV2»

TSA Ignition safety time
tw

Waiting time for oil pre-heating

B

Time of flame establishment

C

Operating position

D

Controlled shut-down by «R»

μC1

Microcontroller 1

μC2

Microcontroller 2

General unit data

Mains voltage

AC 230 V +10 % / -15 %
AC 120 V +10 % / -15 %

Mains frequency

50...60 Hz ±6 %

External primary fuse (Si)

6.3A (slow)

Power consumption

12 VA

Mounting orientation

optional

Weight

approx. 200 g

Degree of protection

IP40 (to be ensured through mounting)

Perm. cable lengths

max. 3m at line capacitance of 100 pF/m

Detector cable laid separately

10 m

Remote reset laid separately

20m

LMO14

LMO24

LMO44

Terminal 1

5 A

        5 A

5 A

Terminals 3 and 8

3 A

        5 A

5 A

Terminals 4, 5 and 10

1 A

        1 A

1A

Terminals 6

1 A

        1 A

2A

Flame supervision with QRB and QRC

QRB

QRC

Min. detector current required (with flame)

45 μA

70 μA

Min detector current permitted (without flame)

5.5 μA 5.5 μA

Max. possible with flame (tipically)

100 μA 100 μA

Measurement circuit for detector current 

Key

μA DC

DC microamperometer with an internal 

resistance of 5 k

:

max.

bl

Blue

sw

Black

br

Brown

R
W
SB

O H

O W

M

Z

BV2

FS

A ´

A

B

C

D

1

8

3

3

6

5

11

12

t1

t3

t3n

TSA

tw

Z

FS

6

11

12

7130d03e/0700

t3n

t3n

BV1

4

12

11

LMO...

bl

μA DC

+

QRB...

7130v01/0700

sw

12

11

LMO...

1

sw

bl

br

μA DC

+

QRC1...

7130v02/0700