Riello RS 190/M User manual

Installation, use and maintenance instructions
Gas Burners
RS 190/M
Low-High-Low or Modulating Operation
C6505057
安装、调试、维修手册
燃 气 燃 烧 器
平滑两端火或比例调节运行

2
CONTENTS
TECHNICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3
burner models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Burner description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Packaging - Weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Max. dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Standard equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Firing rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Minimum furnace dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Gas pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Boiler plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Blast tube length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Securing the burner to the boiler . . . . . . . . . . . . . . . . . . . . . . . . . 7
Ignition pilot adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Combustion head adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Gas piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Adjustments before first firing. . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Servomotor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Burner starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Air pressure switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Maximum gas pressure switch. . . . . . . . . . . . . . . . . . . . . . . . . . 13
Minimum gas pressure switch . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Flame present check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Factory wiring diagram - burner mounted LFL . . . . . . . . . . . . . . 15
Field wiring diagram - Burner mounted LFL. . . . . . . . . . . . . . . . 16
Factory wiring diagram - remote panel. . . . . . . . . . . . . . . . . . . . 17
Appendix - Burner firing rates according to air density. . . . . . . . 18
Siemens LFL control sequence of operation . . . . . . . . . . . . . . . 19
Siemens LFL troubleshooting guide. . . . . . . . . . . . . . . . . . . . . . 20
Burner start up report. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
N.B.
Figures mentioned in the text are identified as follows:
1)(A) =part 1 of figure A, same page as text;
1)(A)p.4 =part 1 of figure A, page number 4.
WARNING
If you smell gas:
• Do not touch any electrical items.
• Open all windows.
• Close all gas supply valves.
• Contact your local gas authority immediately.
Do not store flammable or hazardous materials in the vicinity
of fuel burning appliances.
Improper installation, adjustment, alteration, service or main-
tenance can cause property damage, personal injury or
death. Refer to this manual for instructional or additional in-
formation. Consulta certified installer,servicerepresentative
or the gas supplier for further assistance.
Burner shall be installed in accordance with manufacturers
requirements as outlined in this manual, local codes and au-
thorities having juristiction.
目录
技术参数
燃烧器型号
包装尺寸
燃烧器描述
附件
最大尺寸
标准配置
负荷范围
燃气压力
最小炉膛尺寸
安装

3
TECHNICAL DATA
(1) Reference conditions:Ambient temperature 68 °F (20 °C) - Barometric pressure 394” WC - Altitude 329 ft.
(2) Pressure at test point 17)(A)p.4, with zero pressure in the combustion chamber, with open gas ring 2)(B)p.6 an maximum burner output
(3) Sound pressure measured in manufacturer’s combustion laboratory, with burner operating on test boiler and at maximum rated output.
Burner models designations:
ACCESSORIES
(optional):
•
Kit for LPG operation: The kit allows the RS 190/M burners to operate on LPG.
•
Gas train according to UL regulation: see page 9.
MODEL RS 190/M
Output
(1)
MAX. kW 1420 - 2542
4845 - 8673
MBtu/hr
MIN. kW 522
1781
MBtu/hr
Fuel Natural or Propane gas
- max.delivery SCFH 8673
- pressure at max.delivery
(2)
“WC 5.9
Operation Low - high or modulating
Standard applications Boilers: water, steam, thermal oil
Ambient temperature °F 32 - 104 (0 - 40 °C)
Combustion air temperature °F max 140 (60 °C)
Main electrical supply (+/- 10%) V/Ph/Hz 208 - 230/460/575/3/60
Fan motor rpm
W - HP
V
A
3400
4000 - 5.5
208-230/460/575
15.8 - 9.1 - 7.3
Ignition transformer V1 - V2
I1 - I2 120V - 1 x 7 kV 1.6 A - 23 mA
Electrical power consumption W max 5500
Electrical protection NEMA 1
Noise levels
(3)
dBA 83.1
Model Code Voltage Flame Safeguard
RS 190/M
C9527300 (3787670)
C9527301 (3787670)
C9627300 (3787672)
C9627301 (3787672)
208-230/460/3/60
575/3/60
208-230/460/3/60
575/3/60
Burner mounted
Remote panel
Burner mounted
Remote panel
BURNER RS 190/M
Output kW
MBtu/hr 516 - 2542 1761 - 8673
Code 3010276
Important:
The installer is responsible for the supply and installation of any safety device(s) not indicated in this manual.

4
BURNER DESCRIPTION (A)
1 Combustion head
2 Ignition electrode
3 Screw for combustion head adjustment
4 High gas pressure switch
5 Sleeve
6 Servomotor controlling the gas butterfly valve and of
air damper (by means of a variable profile cam mech-
anism).
When the burner is not operating the air damper is
fully closed in order to reduce heat dispersion from
the boiler due to the flue draught which draws air
from the fan suction inlet.
7 Plug-socket on ionisation proble (flame rod) cable
8 Extensions for slide bars 16) (with kit)
9 Motor contactor and thermal overload with reset but-
ton
10 Power switch for different operations:
automatic - manual - off
Switch for:
Power increase - power reduction
11 Terminal strip
12 Pilot burner attachment
13 Flame safeguard (flame relay) with lock-out pilot light
and lock-out reset button
14 Flame inspection window
15 Low air pressure switch
(differential operating type)
16 Slide bars for opening the burner and inspecting the
combustion head
17 Gas pressure test point and head fixing screw
18 Air pressure test point
19 Flame sensor probe (flame rod)
20 Air damper
21 Air inlet to fan
22 Screws securing fan to sleeve
23 Gas input pipework
24 Gas butterfly valve
25 Boiler mounting flange
26 Flame stability disk
27 Ignition pilot
Two types of burner failure may occur:
Flame safeguard lock-out: if the flame relay 13)(A) push-
button lights up, it indicates that the burner is in lock-out.
To reset, press the pushbutton.
Motor trip: release by pressing the pushbutton on ther-
mal relay 9)(A).
PACKAGING - WEIGHT (B) - Approximate measure-
ments
• The burner is shipped skid mounted Outer dimen-
sions of packaging are indicated in (B).
• The weight of the burner complete with packaging is
indicated in Table (B).
MAX. DIMENSIONS (C) - Approximate measurements
The maximum dimensions of the burners are given in
(C).
Bear in mind that inspection of the combustion head
requires the burner to be opened and the rear part with-
drawn on the slide bars.
The maximum dimension of the burner, without casing,
when open is give by measurement I.
STANDARD EQUIPMENT
1 - Gas train flange
1 - Flange gasket
4 - Flange fixing screws
1 - Burner head gasket
4 - Screws to secure the burner flange to the boiler:
1/2
W x 1
3/8
”
1 - Cap for combustion head
1 - Disc for combustion head
1 - Instruction booklet
1 - Spare parts list
(A)
ABClbs
4931/32“28
1
/
2
“30
29/32“181
D36
(B)
ABCDEFGHILMNO
2613/16“14
13/32“12 13/32“21 27/32“33 11/16“14 21/32“8 3
/
4
“16
15/16“51 21/32“9 1
/
16“5
29/32”7 5
/
16”2”
(C)
D2430
D731

5
FIRING RATES (A)
During operation, burner output varies between:
• MAXIMUM OUTPUT , selected within area A,
• and MINIMUM OUTPUT , which must not be lower than
the minimum limit in the diagram.
RS 190 /M = 1781 MBTU/h = 522 kW
Important:
The FIRING RATE value range has been obtained con-
sidering an ambient temperature of 68 °F (20 °C), and
an atmospheric pressure of 394” WC and with the com-
bustion head adjusted as shown on page 8.
Note:
The FIRING RATE areas given in figure (A) have been
reduced by 10% with respect to the maximum range that
can be reached.
Consult Appendix on page 18 for operation at different
surrounding temperatures and/or altitudes.
MINIMUM FURNACE DIMENSIONS (B)
The firing rates were set in relation to certified test boil-
ers.
Figure (B) indicates the diameter and length of the test
combustion chamber.
Example:
Output 6400 MBtu/hr:
diameter = 31.5 inch; length 10.4 ft
(A)
RS 190/M
D2431
Combustion chamber pressure
“WC
(B) D2920
Diameter (inches)
Length (ft)
Furnace dimensions

6
GAS PRESSURE
The adjacent table shows minimum pressure losses
along the gas supply line depending on the maximum
burner output operation with natural gas.
Column 1
Pressure loss at combustion head.
Gas pressure measured at test point 1)(B), with:
• Combustion chamber at 0”WC;
• Burner operating at maximum output;
• Combustion head adjusted as indicated in diagram
(C)p. 8.
Column 2
Pressure loss at gas butterfly valve 2)(B) with maximum
opening: 90°.
Calculate the approximate maximum output of the
burner as follows:
- subtract the combustion chamber pressure from the
gas pressure measured at test point 1)(B).
- Find the nearest pressure value to your result in col-
umn 1 of the table (A).
- Read off the corresponding output on the left.
Example
• Maximum output operation
• Natural gas
• Gas pressure at test point 1)(B) = 4.33“ WC
• Pressure in combustion chamber = 1.18“ WC
4.33 - 1.18 = 3.15“ WC
An output of 6060 MBtu/hr shown in table (A) corre-
sponds to 3.15”WC pressure, column 1.
This value serves as a rough guide, the effective deliv-
ery must be measured at the gas meter.
To calculate the required gas pressure at test point
1)(B), set the maximim output required from the burner
operation:
- Find the nearest output value in the table (A).
- Read off the pressure at test point 1)(B) on the right in
column 1.
- Add this value to the estimated pressure in the com-
bustion chamber.
Example
• Required burner maximum output operation:
6060 MBtu/hr
• Natural gas
• Gas pressure at burner output of 6060 MBtu/hr,
taken from table (A), column 1 = 3.15”WC
• Pressure in combustion chamber = 1.18”WC
3.15 + 1.18 = 4.33”WC
pressure required at test point 1)(B).
(A)
RS 190/M
MBtu/hr kW ∆p (“ WC)
12
4848
5302
5681
6060
6438
6817
7196
7575
7953
8673
1421
1554
1665
1776
1887
1998
2109
2220
2331
2542
2.76
2.87
2.99
3.15
3.43
3.66
4.02
4.45
4.92
5.91
0.71
0.79
0.87
0.98
1.10
1.18
1.26
1.34
1.46
1.69
D2441
(B)
1
2

7
INSTALLATION
BOILER PLATE (A)
Drill the combustion chamber mounting plate as shown
in (A).The position of the threaded holes can be marked
using the burner head gasket supplied with the burner.
BLASTTUBE LENGTH (B)
The length of the blast tube must be selected according
to the indications provided by the manufacturer of the
boiler, and in any case it must be greater than the thick-
ness of the boiler door complete with its insulation. The
length available, L (inches), is 14
21/32
“.
For boilers with front flue passes 15) or flame inversion
chambers, protective insulation material 13), must be
inserted between the boiler's refractory 14) and the blast
tube 12).
This protective insulation must not compromise the
extraction of the blast tube.
For boilers having a water-cooled front, the insulation
13)-14)(B) is not required unless it is required by the
boiler manufacturer.
SECURINGTHE BURNERTOTHE BOILER (B)
Before securing the burner to the boiler, check through
the blast tube opening to make sure that the flame sen-
sor probe is correctly set in position, as shown in (C).
Now detach the combustion head from the burner, fig.
(B):
- Loosen the four screws 3) and remove the cover 1).
- Disengage the swivel joint 7) from the graduated sec-
tor 8)
- Remove the screws 2) from the two slide bars 5).
- Remove the two screws 4) and pull the burner back on
slide bars 5) by about 4”.
- Disconnect the wires from the probe and the electrode
and then pull the burner completely off the slide bars.
Secure the flange 11)(B) to the boiler plate, inserting the
gasket 9)(B). Use the 4 screws, also supplied with the
unit, after first protecting the thread with an anti-locking
product.
The seal between burner and boiler must be airtight.
If you noticed any irregularities in the positions of the
probe or ignition electrode during the check mentioned
above, remove screw 1)(D), extract the internal part
2)(D) of the head and proceed to set up the two compo-
nents correctly.
IGNITION PILOT ADJUSTMENT
Place the pilot and electrode as shown in fig. (C).
The pilot works correctly at pressures ranging from 5 -
12”WC.
Important
To set the pilot without main burner operation, proceed
as follows:
- Move the jumper from terminals " 30-V11 " to terminals
" 30-VP ", as given in fig. (E), this way the main valve is
cut out.
- With the burner in the manual position, hold the air
damper in the minimum position and make the setting.
- When the setting is correct, replace the jumper on “ 30-
V11 ”.
(C)
inch A B C
RS 190/M 91/16“12
25/32“ - 141/2“5/8W
D455
(A)
(E)
Probe
Electrode
(B)
D2436
Ignition pilot
D2435
(D)
MB - Burner terminal strip
D2434
D2317
1
2

8
COMBUSTION HEAD ADJUSTMENT
Installation operations are now at the stage where the
blast tube and sleeve are secured to the boiler as shown
in fig. (B). It is now a very simple matter to set up the
combustion head, as this depends solely on the MAX
output developed by the burner.
It is therefore essential to establish this value before pro-
ceeding to set up the combustion head.
There are two adjustments to make on the head.
Air adjustment (B) See diagram (C).
Turn screw 4)(B) until the notch identified is aligned with
the front surface 5)(B) of the flange.
Gas adjustment (A)
When the burner is installed for a maximum output ≤
5726 MBtu/hr unscrew and remove the front part 1)(A).
Replace it with the supplied cap 2)(A), after removing
the inner pipe 3)(A).Replace the disc 4)(A) with the sup-
plied disc without hole. If there is low gas supply pres-
sure, the head may be left in standard configuration,
limiting the minimum modulation to 1980 MBtu/hr.
Example
Maximum burner output = 6033 MBtu/hr.
If we consult diagram (C) we find that for this output, air
must be adjusted using notch 3, as shown in fig.(B).
Continuing with the previous example, page 6 indicates
that for burner with output of 6033 MBTU/hr a pressure
of approximately 3.15 “WC is necessary at test point
6)(B).
Once you have finished setting up the head, refit the
burner to the slide bars 3)(D) at approximately 4” from
the sleeve 4)(D) - burner positioned as shown in fig.
(B)p. 7 - insert the flame rod cable and the ignition elec-
trode cable and then slide the burner up to the sleeve so
that it is positioned as shown in fig.(D).
Refit screws 2) on slide bars 3).
Secure the burner to the sleeve by tightening screw 1).
Reconnect the swivel joint 7) to the graduated sector 6).
Connect gas train and pilot train as shown in fig. (A)
page 9.
Important
When fitting the burner on the two slide bars, it is advis-
able to gently draw out the high tension cable and flame
rod cable until they are slightly stretched.
(A)
(C)
(B)
Notches (Air = Gas)
Burner max output
(D) D2442
D2437
D2443

9
GAS PIPING
• The main gas train must be connected to the gas
attachment 1)(A), using flange 2), gasket 3) and
screws 4) supplied with the burner.
• The gas train can enter the burner from the right or left
side, depending on which is the most convenient, see
fig. (A).
• The gas safety shut-off valves 5)-6)(A) must be as
close as possible to the burner to ensure gas reaches
the combustion head within the safety time range.
• The pilot gas train must be connected to the gas
attachment 5)(A) and can enter the burner from the
right or left side.
GASTRAIN (B)
It must be type-approved according to required stand-
ards and is supplied separately from the burner.
Note
See the accompanying instructions for the adjustment of
the gas train.
KEY (A)
1 - Gas input pipe
2 - Manual valve
3 - Pressure regulator
4 - Low gas pressure switch
5 - 1st safety shut off valve VS
6 - 2nd safety shut off valve VR
7 - Standard issue burner with flange gasket
8 - Gas adjustment butterfly valve *
9 - Burner
10 - High gas pressure switch *
* On the burner
(B)
(A) D2393
D2438
TYPICAL SCHEMATIC GAS PIPING
GAS PILOT LINE
MAIN GAS LINE

10
ADJUSTMENTS BEFORE FIRST FIRING
Adjustment of the combustion head, and air and gas
deliveries has been illustrated on page 8.
In addition, the following adjustments must also be
made:
- Open manual valves up-stream from the gas train.
- Adjust the low gas pressure switch to the start of the
scale (A).
- Adjust the high gas pressure switch to the end of the
scale (B).
- Adjust the air pressure switch to the zero position of
the scale (C).
- Purge the air from the gas line.
Fit a U-type manometer (D) to the gas pressure test
point on the sleeve.
The manometer readings are used to calculate the
MAX. burner power using the table on page 6.
Before starting up the burner it is good practice to adjust
the gas train so that ignition takes place in conditions of
maximum safety, i.e. with gas delivery at the minimum.
(D)
D2439
(A)
LOW GAS PRESSURE SWITCH AIR PRESSURE SWITCH HIGH GAS PRESSURE SWITCH
(B) (C)

11
SERVOMOTOR
The servomotor gives simultaneous regulation of the air
damper through the variable cam profile 4)(F) and the
gas butterfly valve.
It rotates by 130° in approx. 35 s.
The factory settings must not be changed for the first fir-
ing, check that they comply with the details below.
To open the servomotor, remove the screws and pull the
cover outward, fig. (A).
CAMS AND TRIM POTENZIOMETERS FUNC-
TIONS
Cam 1: 130°
Limits rotation towards maximum for gas.
Cam 2: 0°
Limits rotation towards minimum, air damper closed on
stand by.
Cam 3: 20°
Limits gas ignition regulation.
Cams 4 - 5 - 6 - 7 - 8: not used
Trim potentiometer MAX
Limits maximum modulation.
It must be set near the stroke end (cam 1) to exploit as
far as possible the variable profile cam and maximum
opening of the gas butterfly valve.
Trim potentiometer MIN
Limits minimum modulation.
It must be set near the stroke end (cam 2) to exploit as
far as possible the variable profile cam.
Trim potentiometer POS
Limits an intermediate operating position between MAX
and MIN, supplying power to the "P" terminal in the ser-
vomotor (through an external command). This function
cuts out any external signals.
Note
Using the slide switch to select MAX or MIN, the servo-
motor goes into the position for the respective settings of
the MAX and MIN TRIM POTENTIOMETERS.
When the settings are complete, place the slide switch
on OPE. (0perating position)
(D)
(F)
(E)
(C)
1 Servomotor
2 Graduated sector for gas
butterfly valve
3 Index for graduated sector 2
4 Adjustable profile cam
5 Adjustment screws for cam
starting profile
6 Adjustment fixing screws
7 Adjustment screws for cam
and profile
Slide switch
Trim potentiometers
Position jumpers
D2277
D2585
D2594
D2593
(A)
(B)
NO
Figure above shows how the servo-
motor is released to manually check
there is no binding though its motion.
Don’t release the button indi-
cated in this figure: the syn-
cronization of the cams
made in factory would be
changed.
YES

12
BURNER STARTING
Close the control curcuit, with the switch in fig. C) in the
AUTO position.
On firing (pilot burner and main valve) turn the switch (C)
to MAN and the switch 1)(E) in the AUT position.
MAXIMUM OUTPUT
Using button (B), "increase output" until it locks out, app.
130° (cam 1).
Place the slide switch on MAX and set the relative MAX
trim potentiometer (setting must be very near to 130°) to
exploit as far as possible the variable profile cam 4)(D)
and have the gas butterfly valve on maximum opening,
graduated sector 2) on index 3) fig. (D).
The setting of the gas flow must be made on the gas train
pressure regulator and, if necessary, on the gas valve.
The air setting must be made on the variable profile cam
4)(D) by turning the screws 5), after loosening the screws
6).
MINIMUM OUTPUT
With the slide switch on the OPE position, use button (B)
"decrease output" until it stops at app. 20° (cam 3).
Put the slide switch in the MIN position and set the mod-
ulation minimum using the relative MIN trim potentiome-
ter.
Set the air using the variable profile cam 4)(D).
If a lower modulation minimum is required than the level
set on cam 3 of the servomotor (20°), decrease the cam
setting.
INTERMEDIATE OUTPUTS
With the switch (C) in the AUTO position, the slide switch
in the OPE position and the switch 1)(E) in the MAN po-
sition, move the button 2)(E) in various intermediate lev-
els between maximum and minimum and set the variable
profile cam 4)(D) to achieve optimum combustion, by
turning the screws 5).
If possible, do not change the previously set maximum
and minimum levels.
Check the various setting levels with a combustion anal-
ysis.
Important
Make a progressive setting of the profile, without sharp
changes.
When the setting is complete, lock the cam profile using
screws 6)(D).
Turn the burner off, release the servomotor as shown in
fig. (B) page 11 and manually turn cam 4)(D) to check for
smooth cam operation.
Finally fix the adjustment by turning the screws 6)(D).
(B) (C)
(D)
1 Servomotor
2 Graduated sector for gas butterfly valve
3 Index for graduated sector 2
4 Adjustable profile cam
5 Adjustment screws for cam starting profile
6 Adjustment fixing screws
7 Adjustment screws for cam and profile
(A)
Slide switch
Trim potentiometers
Position jumpers
(E) D791
12
D2593
D2594

13
AIR PRESSURE SWITCH (A)
Adjust the air pressure switch after having performed all
other burner adjustments with the air pressure switch set
to the start of the scale (A).
With the burner operating at min.output, increase adjust-
ment pressure by slowly turning the relative dial clock-
wise until the burner locks out.
Then turn the dial anti-clockwise by about 20% of the set
point and repeat burner starting to ensure it is correct.
If the burner locks out again, turn the dial anti-clockwise
a little bit more.
Attention:
As a rule, the air pressure switch must block the forma-
tion of CO.
To check this, insert a combustion analyser into the
chimney, slowly close the fan suction inlet (for example
with cardboard) and check that the burner locks out,
before the CO in the fumes exceeds 400 ppm.
The air pressure switch may operate in "differential"
operation in two pipe system. If a negative pressure in
the combustion chamber during pre-purging prevents
the air pressure switch from switching, switching may be
obtained by fitting a second pipe between the air pres-
sure switch and the suction inlet of the fan. In this way
the air pressure switch operates as differential pressure
switch.
HIGH GAS PRESSURE SWITCH (B)
Adjust the high gas pressure switch after having per-
formed all other burner adjustments with the maximum
gas pressure switch set to the end of the scale (B).
With the burner operating at MAX output, reduce the
adjustment pressure by slowly turning the adjustment
dial anticlockwise until the burner locks out.
Then turn the dial clockwise by 0.8” WC and repeat
burner firing.
If the burner locks out again, turn the dial again clock-
wise by 0.4”WC.
LOW GAS PRESSURE SWITCH (C)
Adjust the low gas pressure switch after having per-
formedallthe other burneradjustmentswith the pressure
switch set at the start of the scale (C).
With the burner operating at MAX output, increase ad-
justment pressure by slowly turning the relative dial
clockwise until the burner locks out.
Then turn the dial anti-clockwise by 0.8” WC and repeat
burner starting to ensure it is uniform.
If the burner locks out again, turn the dial anti-clockwise
again by 0.4”WC.
FLAME PRESENT CHECK (D)
The burner is fitted with an ionisation system (flame rod)
which ensures that a flame is present. The minimum
current for reliable operation is 6 µA ( see manufacturers
documentation).The burner provides a much higher cur-
rent, so that controls are not normally required. How-
ever, if it is necessary to measure the ionisation current,
disconnect the plug-socket 7)(A)p.4 on the ionisation
probe cable and insert a direct current microamperome-
ter with a base scale of 100 µA. Carefully check polari-
ties.
(A)
AIR PRESSURE SWITCH
(B)
HIGH GAS PRESSURE SWITCH
(C)
LOW GAS PRESSURE SWITCH
(D) D795
DA
D2548
D2547
D2547

14
MAINTENANCE
Combustion
The optimum calibration of the burner requires an analy-
sis of the flue gases. Significant differences with respect
to the previous measurements indicate the points where
more care should be exercised during maintenance.
Gas leaks
Make sure that there are no gas leaks on the pipework
between the gas meter and the burner.
Flame inspection window
Clean the flame inspection window (A).
Combustion head
Open the burner and make sure that all components of
the combustion head are in good condition, not
deformed by the high temperatures, free of impurities
from the surroundings and correctly positioned. If in
doubt, disassemble the elbow fitting 5)(B).
Servomotor
Disengage the cam 4)(D)p. 12 from the servomotor and
turn it backwards and forwards by hand to make sure it
moves freely.
Burner
Check for excess wear or loose screws in the mecha-
nisms controlling the air damper and the gas butterfly
valve.Also make sure that the screws securing the elec-
trical leads in the burner terminal strip are fully tight-
ened.
Clean the outside of the burner, taking special care with
the linkage joints and cam.
Combustion
Adjust the burner if the combustion values found at the
beginning of the operation do not comply with the regu-
lations in force, or at any rate, do not correspond to good
combustion. Record the new combustion values; they
will be useful for subsequent controls.
TO OPENTHE BURNER (B):
- Switch off the electrical power.
- Loosen screws 1) and withdraw cover 2).
- Disengage the swivel joint 7) from the graduated sec-
tor 8).
- Fit the two extensions onto the slide bars 4).
- Remove screws 3), and pull the burner back by about
4” on the slide bars 4). Disconnect the probe and
electrode leads and then pull the burner fully back.
Now extract the gas distributor 5) after having removed
the screw 6) and disconnecting the pilot gas line.
TO CLOSETHE BURNER (B):
- Push the burner until it is about 4” from the sleeve.
- Re-connect the leads and slide in the burner until it
comes to a stop.
- Refit screws 3), and pull the probe and electrode
leads gently out until they are slightly stretched.
- Re-couple the swivel joint 7) to the graduated sector
8).
- Remove the two extensions from the slide bars 4).
- Connect the pilot gas line.
(A)
FLAME INSPECTION WINDOW
(B)
OPENING THE BURNER
D709
D2440

15
LAYOUT (A)
Burner RS 190/M
• Models RS 190/M leave the factory preset for 208-230V power supply.
• If 460 V power supply is used, change the motor connection from delta to star and change the setting of the thermal cut-out as well.
Key to Layout (A)
CMV - Motor contactor
DA - LFL Control box
MB - Burner terminal strip
MV - Fan motor
PA - Air pressure switch
PGM - High gas pressure switch
SM - Servomotor
SO - Ionisation probe (flame rod)
SP - Plug-socket
TA - Ignition transformer
TB - Burner ground
Factory Wiring Diagram
RS 190/M with burner mounted Siemens LFL control
D2332
(A) D2878
Continuous fan operation
Change the wire connection from terminal 6 to terminal 1, move the jumper from terminals 12-13 to terminals 4-12 and
remove the wire from terminal 13 of control box as indicated below.

16
(A)
D2333
RS 190/M
208 -
230 V 460 V 575 V
F A T25 T20 T15
S AWG 12 12 14
ELECTRICAL CONNECTIONS
Use flexible cables according to local Regulations.
LAYOUT (A)
Electrical connection RS 190/M burners
Fuses and wire size layout (A), see table (B).
Wire size when not indicated: AWG18.
KEYTO LAYOUT (A)
IN - Burner manual stop switch
MB - Burner terminal strip
PG - Min.gas pressure switch
PS - Remote lock-out reset
H1 - Remote lock-out signal
H2 - Burner on signal
H4 - Power on signal
H5 - Permission ok
OC - Operating control
OC2 - High-low control
HL - High limit
VP - Pilot adjustment valve
VPS - Pilot valve (safety)
VR - Adjustment valve
VS - Safety valve
NOTES
• The setting of the thermal overload must be according to the total
burner amperage draw.
• The RS 190/M burners leave the factory preset for 208-230 V
power supply. If 460 V power supply is used, change the fan motor
connection from delta to star and change the setting of the thermal
overload as well.
• The RS 190/M burners have been type-approved for intermittent
operation. This means they should compulsorily be stopped at
least once every 24 hours to enable the control box to check its
own efficiency at start-up. Burner halts are normally provided for
automatically by the boiler load control system.
If this is not the case, a time switch should be fitted in series to IN
to provide for burner shut-down at least once every 24 hours.
(B)
Field Wiring Diagram
RS 190/M with burner mounted Siemens LFL control

17
ELECTRICAL SYSTEM
LAYOUT (B)
Burner RS 190/M
The flame safeguard is in remote panel.
See the internal electrical systems of the remote panel in order to have the complete wiring diagram.
Key to Layout (A)
CMV - Motor contactor
DA - Control box
MB - Burner terminal strip
MV - Fan motor
PA - Air pressure switch
PGM - High gas pressure switch
SM - Servomotor
SO - Ionisation probe (flame rod)
SP - Plug-socket
TA - Ignition transformer
TB - Burner ground
(A)
Factory Wiring Diagram
RS 190/M with remote control panel
D2397

18
The FIRING RATE area values have been obtained considering a surround-
ing temperature of 68°F (20°C), and an atmospheric pressure of 398” W.C.
and with the combustion head adjusted as shown on page 8.
The burner may be required to operate with combustion air at a higher tem-
perature and/or at higher altitudes.
Heating of air and increase in altitude produce the same effect: the expan-
sion of the air volume, i.e. the reduction of air density.
The burner fan's delivery remains substantially the same, but the oxygen
content per cubic meter and the fan's head are reduced.
It is therefore important to know if the maximum output required of the burner
at a given combustion chamber pressure remains within the burner's firing rate range even at different temperature and altitude con-
ditions. Proceed as follows to check the above:
1-Find the correction factor F in the Table (A) for the plant's air temperature and altitude.
2-Divide the burner's delivery Q by F in order to obtain the equivalent delivery Qe:
3-In the firing rate range of the burner, Fig. (B), indicate the work point defined by:
Qe = equivalent delivery
H1 = combustion chamber pressure
The resulting point A must remain within the firing rate range.
4-Plot a vertical line from Point A as shown in Figure (B) and find the maximum pressure H2 of the firing rate.
5-Multiply H2 by F to obtain the maximum reduced pressure H3 of the firing rate.
If H3 is greater than H1, as shown in Fig. (B), the burner delivers the output required.
If H3 is lower than H1, the burner's delivery must be reduced. A reduction in delivery is accompanied by a reduction of the pressure in
the combustion chamber:
Qr = reduced delivery
H1r = reduced pressure
Example, a 5% delivery reduction:
Qr = Q x 0.95
H1r = H1 x (0.95)2
Steps 2 - 5 must now be repeated using the new Qr and H1r values.
Important: the combustion head must be adjusted in respect to the equivalent delivery Qe.
Qe = Q : F (MBtu/hr)
H3= H2x F (“ W.C.)
Qe MBTU/h
A
H2
H1
H3
“W.C.
(B)
D2617
APPENDIX
- Burner firing rates according to air density
above sea level average barom.
pressure
CORRECTION FACTOR F
Air temperature
°F (°C)
ft m “ W.C. mbar 0 (0°C) 41 (5°C) 50 (10°C) 59 (15°C) 68 (20°C) 77 (25°C) 86 (30°C) 104 (40°F)
0
329
658
987
1316
1645
1974
2303
2632
2961
3290
3947
4605
5263
5921
6579
0
100
200
300
400
500
600
700
800
900
1000
1200
1400
1600
1800
2000
399
394
389
385
380
376
372
367
363
358
354
346
337
329
321
313
1013
1000
989
978
966
955
944
932
921
910
898
878
856
836
815
794
1,087
1,073
1,061
1,050
1,037
1,025
1,013
1,000
0,988
0,977
0,964
0,942
0,919
0,897
0,875
0,852
1,068
1,054
1,042
1,031
1,018
1,007
0,995
0,982
0,971
0,959
0,946
0,925
0,902
0,881
0,859
0,837
1,049
1,035
1,024
1,013
1,000
0,989
0,977
0,965
0,954
0,942
0,930
0,909
0,886
0,866
0,844
0,822
1,031
1,017
1,006
0,995
0,983
0,972
0,960
0,948
0,937
0,926
0,914
0,893
0,871
0,851
0,829
0,808
1,013
1,000
0,989
0,978
0,966
0,955
0,944
0,932
0,921
0,910
0,898
0,878
0,856
0,836
0,815
0,794
0,996
0,983
0,972
0,962
0,950
0,939
0,928
0,916
0,906
0,895
0,883
0,863
0,842
0,822
0,801
0,781
0,980
0,967
0,956
0,946
0,934
0,923
0,913
0,901
0,891
0,880
0,868
0,849
0,828
0,808
0,788
0,768
0,948
0,936
0,926
0,916
0,904
0,894
0,884
0,872
0,862
0,852
0,841
0,822
0,801
0,783
0,763
0,743
(A)
H1r = H1x ()
Qr
Q2

19
BURNER OPERATION
BURNER STARTING
• Load control close.
Fan motor starts.
• Servomotor starts:
130° rotation to right, until contact is made on cam
1)(A) page 12.
The air damper is positioned to MAX. output.
• Pre-purge stage with air delivery at MAX.output.
• After pre-purge stage, servomotor rotates to left up to
the angle set on cam 3)(A) page 12 for MIN.output.
• The air damper and the gas butterfly are positioned to
MIN. output.
• Ignition electrode strikes a spark.
• Pilot valve opens.The pilot flame is ignited.
• After about 12 s the main flame ignites and starting
cycle ends.
STEADY STATE OPERATION
At the end of the starting cycle, the servomotor control
then passes to the load control for boiler pressure or
temperature.
(The LFL control box continues, however, to check that
the flame is present and that the air pressure switch is in
the correct position.)
• If the temperature or pressure is low, the burner pro-
gressively increases its output to the MAX. value.
• If the temperature or pressure is high, the burner pro-
gressively decreases its output to the MIN. value.
And so on.
• The burner locks out when demand for heat is less
than the heat supplied by the burner at min. output.
Load control opens.The servomotor returns to the 0°
angle limited by contact with cam 2. The air damper
closes completely to reduce thermal dispersion to a
minimum.
Every time output is changed, the servomotor automati-
cally modifies gas delivery (gas butterfly valve) and air
delivery (fan air damper).
Switching times are given in seconds, in the burner star-
tup sequence.
Legend for the times
t1 Pre-purge time with air damper open
t2 Safety time
t3 Pre-ignition time, short (ignition transformer on
terminal 16)
t4 Interval between start of t2 and release of valve
at terminal 19
t5 Interval between end of t4 and release of load
controller or valve at terminal 20
t5 Running time of air damper into OPEN position
t6 Running time of air damper into low-flame posi-
tion (MIN)
t7 Permissible after-burn time
t8 Interval until OPEN command for the air damper
is given
t9 Running time of pilot
FIRING FAILURE
If the burner does not fire, it locks out within 2.5 seconds
from opening the pilot valve and then within 5 seconds
from opening the main valves.
BURNER FLAME GOES OUT DURING OPERATION
If the flame should accidentally go out during operation,
the burner will lock out within 1s.
LFL 1.335 Series 01
t1
t2
t3
t4
t5
30
2
4
20
optional
t6
t7
t8
t9
optional
12
4
16
(A)
Full Modulation
D2273
Low - High
D2274
(B)

20
BURNER FAULTS
Control program under fault
conditions and lock-out
indication
In case of any disturbance, the sequence mechanism stops and with it the lock-out indicator.The symbol
above the reading mark of the indicator gives the type of disturbance:
No start, e.g.because one contact is not closed.Lock-out during or after control program sequence
due to extraneous light (e.g.non-extinguished flames, leaking fuel valves, defects in the flame
supervision circuit, etc.)
Interruption of startup sequence, because the OPEN signal has not been delivered to terminal 8
by limit switch “a”.Terminals 6, 7 and 14 remain under voltage until the fault has been corrected!
Lockout, because there is no air pressure indication at the beginning of air pressure control.
Every air pressure failure after this moment in time leads to lock-out, too!
Lock-out due to a fault in the flame supervision circuit.
Interruption of startup sequence, because the position signal for the low-flame position has not
been delivered to terminal 8 by auxiliary switch“m”.Terminals 6, 7 and 14 remain under voltage until
the fault has been corrected!
Lock-out, because no flame signal is present after completion of the (1st) safety time.
Lock-out, because no flame signal has been received on completion of the 2nd safety time (flame
signal of the main flame with interrupted pilot burners).
Lock-out, because the flame signal has been lost during burner operation.
If lock-out occurs at any other moment in time between the start and the pre-ignition wich is not marked by a
symbol, this is usually caused by a premature, i.e.faulty flame signal, e.g.caused by a self-igniting UV tube.
P
1
2