Riello Burners RL 70/2 Quick start guide

Installation, use and maintenance instructions
Light Oil Burners
RL 70/2 - 100/2 - 130/2
Low - High Operation
C6505052

2
CONTENTS
TECHNICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3
Burner models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Burner description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Packaging - Weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Max. dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Standard equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Firing rate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Boiler plate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Blast tube length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Securing the burner to the boiler . . . . . . . . . . . . . . . . . . . . . . . 6
Choice of nozzles for low and high fire . . . . . . . . . . . . . . . . . . . 6
Nozzle assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Combustion head setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Fuel supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Hydraulic connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Burner calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Final check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Burner operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Factory wiring diagram - burner mounted LAL control. . . . . . . 13
Field wiring diagram- burner mounted LAL control . . . . . . . . . 14
Factory wiring diagram - remote panel . . . . . . . . . . . . . . . . . . 15
Appendix - Burner firing rates according to air density. . . . . . . . . .16
Siemens LAL control sequence of operations. . . . . . . . . . . . . 17
Siemens LAL control troubleshooting guide . . . . . . . . . . . . . . 18
Start up report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
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
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, service representative
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.

3
TECHNICAL DATA
(1) Reference conditions: Ambient temperature 68° F (20° C) - Barometric pressure 394” WC - Altitude 329 ft.
(2) Sound pressure measured in manufacturers combustion laboratory, with burner operating on test boiler and at maximum rated output.
(3) Equivalent Btu values based on 1 USGPH = 140,000 Btu/hr.
Burner models designations:
ACCESSORIES
(optional):
• Kit for lengthening the combustion head
L = Standard length
L1 = Length obtainable with the kit
COD. 3010253 L = 9
27/32
“ L1 = 15
5/32
“ • RL 70
COD. 3010254 L = 9
27/32
“ L1 = 15
5/32
“ • RL 100
COD. 3010255 L = 9
27/32
“ L1 = 15
5/32
“ • RL 130
MODEL RL 70 RL 100 RL 130
Output
(1)
Delivery
(1)
High fire MBtu/hr
(3)
1792 - 3136
12.8 - 22.4 2688 - 4480 19.2 - 32 3584 - 5824 25.6 - 41.6
GPH
Low fire MBtu/hr
(3)
966 - 1792
6.9 - 12.8 1344 - 2688 9.6 - 19.2 1834 - 3584 13.1 - 25.6
GPH
Fuel # 2 Fuel oil
Operation Low - high
Nozzles number 2
Standard applications Hot water, steam, thermal oil
Ambient temperature °F 32 - 104 (0 - 40 °C)
Combustion air temperature °F max 140 (60 °C)
Main power supply (+/- 10 %) V/Ph/Hz 208-230 / 460 / 575 / 3/60
Fan motor rpm
W - HP
V
A
3400
1100 - 1.5
208 - 230/460/575
4.8 / 2.8 / 2.3
3400
1800 - 2.5
208 - 230/460/575
6.7 / 3.9 / 3.2
3400
2200 - 3
208 - 230/460/575
8.8 / 5.1 / 4.1
Ignition trasformer V1 - V2
I1 - I2 120V - 2 x 5 kV 3.7 A - 35 mA
Pump delivery (174 Psi)
pressure range GPH PSI 34.3 145 - 290 52.5 145 - 290
Electrical power consumption W max 1400 2200 2600
Electrical protection NEMA1
Noise levels
(2)
dBA 68.0 70.0 70.0
Model Code Voltage Flame safeguard
RL 70
C9514200 (3475070)
C9514201 (3475070)
C9614200 (3475072)
C9614201 (3475072)
208-230/460/3/60
575/3/60
208-230/460/3/60
575/3/60
Burner mounted
Burner mounted
Remote panel
Remote panel
RL 100
C9515200 (3475270)
C9515201 (3475270)
C9615200 (3475272)
C9615201 (3475272)
208-230/460/3/60
575/3/60
208-230/460/3/60
575/3/60
Burner mounted
Burner mounted
Remote panel
Remote panel
RL 130
C9516200 (3475470)
C9516201 (3475470)
C9616200 (3475472)
C9616201 (3475472)
208-230/460/3/60
575/3/60
208-230/460/3/60
575/3/60
Burner mounted
Burner mounted
Remote panel
Remote panel
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 Ignition electrodes
2 Combustion head
3 Screw for combustion head adjustment
4 Screw for fixing fan to flange
5 Slide bars for opening the burner and inspecting
the combustion head
6 Safety solenoid valve
7 Pump
8 Air inlet to fan
9 Air damper
10 Hydraulic cylinder for regulation of the air damper
at low and high positions. When the burner is not
operating the air damper is fully closed in order to
reduce heat loss from the boiler.
11 Fan pressure test point
12 Boiler mounting flange
13 Flame stability disk
14 Electrical motor
15 Extensions for slide bars 5)
16 Ignition transformer
17 Motor contactor and thermal cut-out with reset button
18 Low and high fire valve assembly
19 Terminal strip
20 Two switches:
- one "burner off - on"
- one low - high operation"
21 Knockouts for wiring carried out by the installer
22 Flame safeguard with lock-out pilot light and lock-
out reset button
23 Flame inspection window
24 Pump pressure adjustment
25 Photocell (cad cell)
26 Air pressure switch
Two types of burner failure may occur:
•
FLAME SAFEGUARD LOCK-OUT:
if the Flame relay 22)(A) pushbutton lights up, it in-
dicates that the burner is in lock-out.
To reset, press the pushbutton.
•
MOTOR TRIP:
release by pressing the pushbutton on thermal relay.
PACKAGING-WEIGHT (B)
Approximate measurements
•
The burner is shipped on a skid. Outer dimensions
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).
Inspection of the combustion head requires the burner
to be opened and the rear part withdrawn on the slide
bars.
The maximum dimension of the burner when open is
given in measurement I.
STANDARD EQUIPMENT
2 - Flexible hoses
1 - Head gasket
4 - Screws to secure the burner flange to the boiler:
1/2 W x 13/8”
1 - Instruction booklet
1 - Spare parts list
1 - Adaptor G1/8” - 1
3/8
” NPT
D36
(A)
(B)
D686
(C)
inch A(1) B C lbs
RL70
RL100
RL130
3725/32” - 459/32”
3725/32” - 459/32”
3725/32” - 459/32”
235/8”
235/8”
235/8”
2511/16”
2511/16”
2511/16”
132
139
146
(1) Blast tube: short - long (obtainable with the kit)
RLABCDE F (1) GH I (1)
70 2227/32”11
21/32”11 3
/
16”21
27/32”2625/32”9 27/32” - 155/32”7 1
/
16”16
15/16”37 7
/
16”- 423/4”
100 2319/32”12
9
/
32”11
5
/
16”21
27/32”2625/32”9 27/32” - 155/32”7 1
/
16”16
15/16”37 7
/
16”- 423/4”
130 245/8”13
5
/
16”11
5
/
16”21
27/32”26 25/32”9 27/32” - 155/32”7 7
/
16”16
15/16”37 7
/
16”- 423/4”
D2323
D2324

5
FIRING RATE (A)
The RL 70 - 100 - 130 Model burners can work in two
ways: Low and High fire.
LOW FIRE DELIVERY must be selected within area A
of the adjacent diagrams.
HIGH FIRE DELIVERY must be selected within area B
(and C for model RL 130). This area provides the max-
imum delivery of the burner in relation to the pressure
in the combustion chamber.
The firing rate may be found by plotting a vertical line
from the desired delivery and a horizontal line from the
pressure in the combustion chamber. The intersection
of these two lines is the firing rate which must lie within
area B. In order to also utilize area C (RL 130) it is nec-
essary to perform the calibration of the combustion
head as explained on page 6.
Important:
the FIRING RATE area values have been obtained
considering an ambient temperature of 68° F (20 °C),
and an atmospheric pressure of 394” WC (approx. 329
ft above sea level) and with the combustion head ad-
justed as shown on page 7.
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 16 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 2579 MBTU/hr:
diameter 24 inch - length 6.6 ft.
(A)
comb. chamber “WC comb. chamber “ WC comb. chamber “ WC
D2325
(B) D2919
Diameter (inches)
Length (ft)
Furnace dimensions

6
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 gasket supplied with the
burner.
BLASTTUBE LENGTH (B)
The length of the blast tube must be selected accord-
ing to the indications provided by the manufacturer of
the boiler, and it must be greater than the thickness of
the boiler door complete with its insulation. The range
of lengths available, L (inch), is as follows:
Blast tube 9): RL 70 RL 100 RL 130
• short 9
27/32
9
27/32
9
27/32
• long (with the kit) 15
5/32
15
5/32
15
5/32
For boilers with front flue passes 12) or flame inversion
chambers, protective insulation material 10) must be
inserted between the boiler's refractory 11) and the
blast tube 9).
This protective insulation must not compromise the ex-
traction of the blast tube.
For boilers having a water-cooled front, the insulation
10)-11)(B) is not required unless it is required by the
boiler manufacturer.
SECURINGTHE BURNERTOTHE BOILER (B)
Disassemble the blast tube 9) from the burner 6) by
proceeding as follows:
- Loosen the four screws 3) and remove the cover 1).
- Remove the screws 2) from the two slide bars 5).
- Remove the two screws 4) fixing the burner 6) to the
flange 5).
- Withdraw the blast tube 9) complete with flange 7)
and slide bars 5).
COMBUSTION HEAD CALIBRATION
At this point check, for model RL 130, whether the
maximum delivery of the burner in high fire operation
is contained in area B or in area C of the firing rate.
See page 5.
If it is in area B then no operation is required.
If, on the other hand, it is in area C:
- Unscrew the screws 1)(C) and disassemble the
blast tube 5).
- Unscrew the screws 3) and remove the shutter 4).
- Tighten the screws 3) on the rod 2).
- Now refit the blast tube 5) and the screws 1).
Once this operation has been carried out (if required),
secure flange 7)(B) to the boiler plate inserting the
supplied gasket 8). Use the 4 screws provided after
having protected the thread with an antiseize product
(high-temperature grease, compounds, graphite). The
burner-boiler seal must be airtight.
CHOICE OF NOZZLES FOR LOW AND HIGH FIRE
Both nozzles must be chosen from among those listed
in Table (D).
The first nozzle determines the delivery of the burner
at low fire.
The second nozzle works in combination with the low
fire nozzle to determine the delivery of the burner at
high fire.
The total deliveries of low and high fire must be con-
tained within the value range indicated on page 3.
Use nozzles with a 60° spray angle at the recommend-
ed pressure of 174 PSI.
(A)
inch A B C
RL 70 79/32“10
27/32“ - 1213/16“1/2W
RL 100 79/32“10
27/32“ - 1213/16“1/2W
RL 130 79/32“10
27/32“ - 1213/16“1/2W
Nozzle
size GPH MBtu/hr
174 PSI
145 PSI 174 PSI 203 PSI
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.3
8.5
9.0
9.5
10.0
10.5
11.0
12.0
12.3
13.0
13.8
14.0
15.0
15.3
16.0
17.0
17.5
18.0
19.0
19.5
20.0
21.5
22.0
6.15
6.76
7.40
8.00
8.61
9.22
9.86
10.21
10.47
11.08
11.69
12.30
12.94
13.54
14.76
15.15
16.01
17.00
17.23
18.48
18.83
19.69
20.94
21.55
22.16
23.38
24.01
24.62
26.48
27.09
6.79
7.46
8.17
8.84
9.51
10.18
10.85
11.27
11.56
12.23
12.90
13.58
14.28
14.95
16.30
16.71
17.64
18.73
19.02
20.37
20.78
21.74
23.09
23.76
24.46
25.81
26.48
27.15
29.20
29.86
7.40
8.13
8.87
9.60
10.34
11.08
11.81
12.26
12.55
13.29
14.06
14.76
15.50
16.23
17.71
18.16
19.18
20.27
20.65
22.16
22.57
23.63
25.10
25.84
26.58
28.05
28.79
29.52
31.73
32.47
951
1044
1144
1238
1331
1425
1519
1578
1618
1712
1806
1901
1999
2093
2282
2339
2470
2622
2663
2852
2909
3044
3233
3326
3424
3613
3707
3801
4088
4180
(B)
(C)
D455
D2326
D690
(D)

7
The two nozzles usually have equal deliveries, but the
low fire nozzle may have the following specifications if
required:
•a delivery less than 50% of the total delivery when-
ever the back-pressure peak must be reduced at the
moment of firing: the burner allows good combustion
values also with a ratio 40 - 100 % between low and
high fire;
•a delivery higher than 50% of the total delivery
whenever the combustion during low fire must be
improved.
Example with the RL 70 Model:
Boiler output = 2130 MBTU/hr - efficiency 80 %
Output required by the burner =
2130 : 0.8 = 2662 MBTU/hr;
2662 : 2 = 1331 MBTU/hr per nozzle;
therefore, two equal, 60°, 174 PSI nozzles are re-
quired:
1° = 7.0 GPH - 2° = 7.0 GPH,
or the following two different nozzles:
1° = 6.0 GPH - 2° = 8.0 GPH,
or:
1° = 8.0 GPH - 2° = 6.0 GPH.
NOZZLE ASSEMBLY
At this stage of installation the burner is still disassem-
bled from the blast tube; it is now possible to install the
two nozzles, after having removed the plastic plugs
2)(A), fitting the wrench through the central hole in the
flame stability disk.
Do not use any sealing products such as gaskets,
sealing compound, or tape. Be careful to avoid damag-
ing the nozzle sealing seat. The nozzles must be
screwed into place tightly but carefully.
The nozzle for low fire operation is the one lying be-
neath the firing electrodes Fig. (B).
Make sure that the electrodes are positioned as shown
in Figure (B).
Finally remount the burner 3)(C) to the slide bars 2)
and slide it up to the flange 5), keeping it slightly raised
to prevent the flame stability disk from pressing
against the blast tube.
Tighten the screws 1) on the slide bars 2) and screws
4) fixing the burner to the flange.
If it proves necessary to change a nozzle with the
burner already fitted to the boiler, proceed as outlined
below:
- Retract the burner on its slide bars as shown in
fig. (B)p.6.
- Remove the nuts 1)(D) and the disk 2).
- Use wrench 3)(D) to change the nozzles.
COMBUSTION HEAD SETTING
The setting of the combustion head depends exclu-
sively on the delivery of the burner at high fire - in other
words, the combined delivery of the two nozzles se-
lected on page 6. Turn screw 4)(E) until the notch
shown in diagram (F) is level with the front surface of
flange 5)(E).
Example:
The RL 70 Model with two 6.00 GPH nozzles and 174
PSI pump pressure.
Find the delivery of the two 6.00 GPH nozzles in table
(D), page 6:
8.17 + 8.17 = 16.34 GPH.
Diagram (F) indicates that for a delivery of 16.34 GPH
the RL 70 Model requires the combustion head to be
set to approx. three notches, as shown in Figure (E).
(A)
(C)
(D)
(E)
SETTING THE COMBUSTION HEAD
(F)
N° Notches
Fuel oil delivery at high fire USGPH
(B)
D691
D2360
D694
D462
D2327
D2281

8
HYDRAULIC SYSTEM
FUEL SUPPLY
Double-pipe circuit (A)
The burner is equipped with a self-priming pump which
is capable of feeding itself within the limits listed in the
table at the left.
The tank higer than the burner A
The distance "P" must not exceed 32 ft in order to
avoid subjecting the pump's seal to excessive strain;
the distance "V" must not exceed 13 ft in order to per-
mit pump self-priming even when the tank is almost
completely empty.
The tank lower than the burner B
Pump suction values higher than 6.5 PSI must not be
exceeded because at higher levels gas is released
from the fuel, the pump starts making noise and its
working life-span decreases.
It is good practice to ensure that the return and suction
lines enter the burner from the same height; in this way
it will be less probable that the suction line fails to
prime or stops priming.
The loop circuit
A loop circuit consists of a loop of piping exiting and re-
turning to the tank with an auxiliary pump that circu-
lates the fuel under pressure. A branch connection
from the loop goes to feed the burner. This circuit is ex-
tremely useful whenever the burner pump does not
succeed in self-priming because the tank distance
and/or height difference are higher than the values list-
ed in the table.
Key (A)
H = Pump/Foot valve height difference
L = Piping length
Ø = Inside pipe diameter
1 = Burner
2 = Pump
3 = Filter
4 = Manual on/off valve
5 = Suction line
6 = Foot valve
7 = Return line
HYDRAULIC CONNECTIONS (B)
The pumps are equipped with a by-pass that connects
return line and suction line. The pumps are installed on
the burner with the by-pass closed by screw 6)(A)p.12.
It is therefore necessary to connect both hoses to the
pump.
The pump seal will be damaged immediately if it is
run with the return line closed and the bi-pass
screw inserted.
Remove the plugs from the suction and return connec-
tions of the pump.
Insert the hose connectors with the supplied seals into
the connections and screw them down.
Take care that the hoses are not stretched or twisted
during installation.
Install the hoses where they cannot be stepped on or
come into contact with hot surfaces of the boiler.
Now connect the other end of the hoses to the supplied
nipples, using two wrenches, one to hold the nipple
steady while using the other one to turn the rotary un-
ion on the hose.
(A)
+ H
- H
(ft)
L (ft)
RL 70 RL 100 - 130
Ø (inch) Ø (inch)
3/8” 1/2” 5/8” 3/8” 1/2” 5/8”
+ 13 168 368 493 234 454 493
+ 10 148 326 493 204 401 493
+ 6.6 128 283 493 174 399 493
+ 3.3 105 240 474 145 296 493
+ 1.6 95 217 434 132 270 493
0 85 197 395 118 243 451
- 1.6 76 178 355 105 217 405
- 3.3 66 155 316 92 191 359
- 6.6 43 112 234 63 138 266
- 10 23 69 151 33 86 174
-13 –2669–3382
(B)
A
B
1
2
3
7
5
6
6
4
75
3
15/16”
- H + H V
P
D737
HYDRAULIC CONNECTIONS
D2328

9
PUMP (A)
1 - Suction 1/4” NPT
2 - Return 1/4” NPT
3 - Pressure gauge attachment G 1/8
4 - Vacuum gauge attachment G 1/8
5 - Pressure adjustment screw
6 - Screw for by-pass
A - Min. delivery rate at 174 PSI pressure
B - Delivery pressure range
C - Max. suction pressure
D - Viscosity range
E - Light oil max. temperature
F - Max. suction and return pressure
G - Pressure calibration in the factory
H - Filter mesh width
PUMP PRIMING
-Before starting the burner, make sure that the
tank return line is not clogged. Obstructions in
the line could cause the seal located on the
pump shaft to break. (The pump leaves the facto-
ry with the by-pass closed).
- In order for self-priming to take place, one of the
screws 3)(A) of the pump must be loosened in order
to bleed off the air contained in the suction line.
- Start the burner by closing the control circuit and
with switch 1)(C)p.10 in the "ON" position. The
pump must rotate in the direction of the arrow
marked on the cover.
- The pump can be considered to be primed when the
light oil starts coming out of the screw 3). Stop the
burner: switch 1)(C)p.12 set to "OFF" and tighten
the screw 3).
The time required for this operation depends upon the
diameter and length of the suction tubing. If the pump
fails to prime at the first starting of the burner and the
burner locks out, wait approx. 15 seconds, reset the
burner, and then repeat the starting operation as often
as required. After 5 or 6 starting operations allow 2 or
3 minutes for the transformer to cool.
Do not illuminate the photocell or the burner will lock
out; the burner should lock out anyway about 10 sec-
onds after it starts.
Important:
The priming operation is possible because the pump is
already full of fuel when it leaves the factory. If the
pump has been drained, fill it with fuel through the
opening on the vacuum gauge prior to starting; other-
wise, the pump will seize. Whenever the length of the
suction piping exceeds 66-99 ft, the supply line must
be filled using a separate pump.
(A)
PUMP AJ6
A
B
C
D
E
F
G
H
GPH
PSI
PSI
cSt
°F - °C
PSI
PSI
inch
53
145 - 290
6.5
2,8 - 75
140 - 60
29
174
0,006
D2329
RL 70 - 100 - 130: SUNTEC AJ6

10
BURNER CALIBRATION
FIRING
Set switch 1)(C) to "ON".
During the first firing, during the switch over from low
to the high fire, there is a momentary lowering of the
fuel pressure caused by the filling of the high fire noz-
zle tubing. This lowering of the fuel pressure can
cause the burner to lock-out and can sometimes give
rise to pulsations.
Once the following adjustments have been made, the
firing of the burner must generate a noise similar to the
noise generated during operation.
OPERATION
The optimum calibration of the burner requires an
analysis of the flue gases at the boiler outlet and ad-
justments at the following points:
•Low and high fire nozzles
See the information listed on page 6.
•Combustion head
The adjustment of the combustion head already car-
ried out need not be altered unless the high fire de-
livery of the burner is changed.
•Pump pressure
174 PSI: this is the pressure calibrated in the factory
which is usually sufficient for most purposes. Some-
times, this pressure must be adjusted to:
145 PSI in order to reduce fuel delivery. This adjust-
ment is possible only if the ambient temperature re-
mains above 0°C. Never calibrate to pressures below
145 PSI, at which pressures the cylinders may have
difficulty in opening;
203 PSI order to increase fuel delivery or to ensure
firings even at temperatures of less than 0°C.
In order to adjust pump pressure, use the relevant
screw 5)(A)p.11.
•Low fire air damper
Keep the burner operating at low fire by setting the
switch 2)(C) to the low position. Opening of the air
damper 6)(B) must be adjusted in proportion to the
selected nozzle: the index 1)(A) must be aligned with
the notch 2)(A) specified in table (D). This adjust-
ment is achieved by turning the hex element 2)(B):
- in rh direction (- sign) the opening is reduced
- in lh direction (+ sign) the opening increases.
Example RL 70 - Low fire nozzle 6.00 GPH:
2.3 (A) notch aligned with index 1)(A).
When the adjustment is done lock the hex element
2)(B) with the ring nut 1).
•High fire air damper
Set switch 2)(C) to the high position and adjust the
air damper 6)(B) by turning the hex element 4)(B), af-
ter having loosened the ring nut 3)(B).
Air pressure at attachment 1)(E) must be approxi-
mately the same as the pressure specified in table
(E) plus the combustion chamber pressure meas-
ured at attachment 2). Refer to the example in the
adjacent figure.
NOTE:
in order to facilitate adjustment of hex elements 2) and
4)(B), use a 1/8” Allen key 5)(B).
(D)
(C)
12
Burner Stage
Off
On 2°
1°
RL 70 RL 100 RL 130
Nozzle
size
GPH N° Nozzle
size
GPH N° Nozzle
size
GPH N°
5
6
7
8
9
2
2.3
2.6
2.7
2.8
7
8
9
10
11
12
13
14
2
2.1
2.2
2.4
2.6
2.7
2.8
2.9
10
11
12
13
14
15
16
17
18
19
2
2.1
2.2
2.3
2.5
2.6
2.7
2.8
2.9
3
Low fire
RL 70 RL 100 RL 130
Nozzle
size
GPH “WC Nozzle
size
GPH “WC Nozzle
size
GPH “WC
13
16
19
22
3.3
3.4
3.5
3.6
19
22
26
29
32
2.8
3.0
3.3
3.7
4.3
26
29
32
35
38
42
2.7
2.8
3.0
3.2
3.5
4.3
3.3 (1)
High fire
D469
(A) (B)
“WC = Air pressure in 1) with zero pressure in 2)
(1) Without shutter 4)(C)p.6
(E)
D2330
D699