Riello G200 Installation instructions

Installation & Operating Manual
2903254 (1)
Single stage operation forced draught natural gas/propane burner
CODE MODEL TYPE
3757116 G200 571T
The following pages contain information, descriptions and diagrams for the proper instal-
lation and wiring of the burner. Please read carefully before attempting final installation.
This manual is to remain with the final installation designation. It is the installer’s responsibil-
ity to ensure that the burner installation and operation instructions mentioned in this manual
are followed and operated within local code authority limits.

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TABLE OF CONTENTS
Installation instructions and owner's handbook . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Step by step procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Serial number identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Burner components identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Burner dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrode & flame probe adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Typical gas train layout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Installing the burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Installation of sediment trap & burner supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Factory wiring diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Field wiring diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Setting up the burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Step by step procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Operating faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Air gate adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Orifice installation and combustion head setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Manifold pressures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Pressure working chart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Combustion chamber size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Combustion checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Burner start-up cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Problem solving guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Owner information & routine maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Installation data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Propane burner application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Spare parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Burner start-up form . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

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INSTALLATION INSTRUCTIONS AND OWNER'S HANDBOOK
CAUTION:
All gas burners MUST be installed by trained and licensed technicians.
WARNING:
Installation of this burner must conform with local codes or, in the absence of local codes, with the
Standard for the Installation of Domestic Gas Conversion Burners, ANSI Z21.8-1984, and Addendum,
Z21.8a-1989, and the National Fuel Gas code, ANSI Z223.1-1984, and CAN/CGA B149.1 &.2. If an ex-
ternal electrical source is utilized, the conversion burner, when installed, must be electrically ground-
ed in accordance with local codes or, in the absence of local codes, with the national Electrical Code,
ANSI/NFPA No. 70-1990 and CSA Electrical Code.
Owner is required to retain this manual for future reference.
WARNING:
If the information in these instructions is not followed exactly, a fire or explosion may result causing
property damage, personal injury or death.
Do not store or use gasoline or any other flammable vapours or liquid in the vicinity of this or any
other appliance.
WHAT TO DO IF YOU SMELL GAS:
1) Do not try to light any appliance.
2) Do not touch electrical switches; do not use any phone in your building.
3) Immediately call your gas supplier from a neighbour's phone.
Follow the gas supplier's instructions.
4) If you cannot reach your gas supplier, call the fire department.
Installation and service must be performed by a qualified installer, service agency or the gas
supplier.
TECHNICAL SPECIFICATIONS
FIRING RATE 70,000 TO 200,000 Btu/hr
NATURAL GAS PROPANE
GAS SUPPLY PRESSURES MIN. 5" wc
MAX. 7" wc
MIN. 12" wc
MAX. 14" wc
MANIFOLD PRESSURES MIN. 3" wc
MAX. 5" wc
MIN. 3" wc
MAX. 5" wc
POWER
MOTOR
CONTROL MODULE
120 Volts 60 Hz 1 phase
232T 2.2 Amps 3250 rpm
525 SE/A ELECTRONIC

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GENERAL INFORMATION
Your Riello gas burner comes to you completely assembled and factory wired, ready for installation.
Models equipped with the short combustion head have a fixed flange, which bolts directly to the front of the appli-
ance. When equipped with the long combustion head, the burner comes with a universal flange, which when bolt-
ed to the appliance, allows the burner to be adjusted for exact positioning in the combustion zone.
STEP-BY-STEP PROCEDURE
1) Remove the burner from the carton, taking care not to lose any of the supplied accessories.
Check for signs of physical damage.
2) Bolt the combustion head and burner to the appliance. Be sure to install the supplied mounting gasket.
Ensure that the burner is level (we suggest using a spirit level) and that the combustion head is centred in the
appliance port. Refer to page 7 for positioning of combustion head relative to the chamber.
3) Check that all gas train connections are tight and make your connections to the incoming gas supply.
a) A sediment trap must be provided. See page 8.
b) If not already installed, a manual shutoff valve must be supplied. This valve must be upstream of the burner
gas train supply connection.
c) A 1/8" NPT plugged tapping must be installed immediately upstream of the burner gas train supply connec-
tion and must be accessible for a test gauge.
d) If required by local codes, provide gas vent lines at the gas regulators and valve (Riello gas trains are
equipped with vent limiting orifices).
e) Perform required gas pressure test on incoming gas supply lines.
NOTE: Details of sediment trap, manual gas valve, and pressure test point, and line pressure test point can be
found on page 8.
4) To make electrical connections, refer to field wiring diagram on page 9. A manual disconnect switch must be in-
stalled in the incoming lines. Wiring to the low voltage-switching relay, if used, (Honeywell R8038A) must be
rigid conduit or flexible approved cable.
CAUTION:
Label all wires prior to disconnection when servicing controls.
Wiring errors can cause improper and dangerous operation.
Verify proper operation after servicing. (Step 5 e below.)
CAUTION:
The phase (HOT) wire must be connected to the black lead of the 24v relay if used; neutral to the
white lead. Do not reverse the polarity.
The burner will not operate with the Phase/Neutral reversed, and the control box may be damaged.
5) Check the burner functions as follows:
a) Make a final check on both the gas and electrical connections.
b) Loosen the screw in the manifold gas test point and install an appropriate manometer.
c) Set the thermostat at its highest setting.
d) Switch on power.
e) With the manual gas valve turned off, press the burner reset button (9, page 4), and allow the burner to run
through a complete cycle to ensure that the sequence of operations is correct. A full starting cycle should
take approximately 40 seconds from a no power condition until burner lockout; refer to the start-up cycle
chart found on page 14.
f) Once burner is operational (up and running) a final gas leak check must be completed on the gas train.
6) If the burner is installed on a central warm air furnace, affix the mandatory warning labels to the furnace fan
cover door (inside and outside).

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SERIAL NUMBER IDENTIFICATION
Your Riello burner may have been manufactured in more than one location and therefore there are two possible serial
number identification.
The Riello 9 character serial number, example,
06 01 12345, is identified as follows:
06 = Last two digits of the year of manufacture;
01 = Week of manufacture;
12345 = Increment of 1 for each burner produced – specific
to product code – reset to zero each January 1st.
The Riello 15 character serial number, example,
06 A 8511111 00025, is identified as follows:
06 = Last two digits of the year of manu-
facture;
A= BI-week of manufacture;
8511111 = Burner product code;
00025 = Increment of 1 for each burner pro-
duced – specific to product code –
reset to zero each January 1st.
BURNER COMPONENTS IDENTIFICATION
(06) (01) (12345)
Year of
manufacture
BI-week of
manufacture Increment
(06) (A) (8511111) (00025)
Year of
manufacture
BI-week of
manufacture Increment
BI-week of
manufacture
LN
L
N
1 – Control box
2 – Air pressure switch
3 – Screw for fixing the cover
4 – Cable grommet
5 – Wiring terminal block
6 – Screws for fixing the air-damper
7 – Air damper
8 – Capacitor
9 – Reset button with lock-out lamp
10 – Gas valve transformer 120V / 24V
7
6
8
2
3
1 9
4 5
D7337
10

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BURNER DIMENSIONS
ELECTRODE AND FLAME PROBE ADJUSTMENTS
WARNING:
Do not turn the ignition electrode. Leave it as shown in the drawing.
If the ignition electrode is put near the ionization probe, the amplifier of the control box may be damaged.
NOTE: Actual available insertion length must be measured from tip of end cone to face of mounting gasket.
Model 200 A B C D E F G G1 H I J
inches 9 3/16 10 11/16 1 57/64 1 7/64 1/211 5/83 15/16 10 33/64 3 9/16 5 7/16 7 2/32
mm 233 272 48 28 13 295 100 267 91 138 180
A
B
D
GF
G1
H
J
I
C
D7332
E
5 1/2”-140mm
7 1/2” - 190 mm
8 15/32” - 215 mm
7 3/32” - 180 mm
3 31/32”
101 mm
60°
45°
30°
D7351
15
44
0
-1
Ionization probe Ignition electrode
Propane sleeve Propane orifice
Probe Electrode
A
B
A B
mm 8 ± 0.5 4 ± 0.5
inch 5/16”5/32”
D7323
1.3
Diffuser
1.7

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TYPICAL GAS TRAIN LAYOUT
THE GAS TRAIN LEAVES THE FACTORY SET AT 3.5” wc.
ATTENTION
This gas train scope of supply meets the minimum controls requirements according to CSA Canada and
USA regulations. Any additional requirements needed to meet local codes are the responsibility of others.
VALVE LEGEND
1- Gas supply & flow direction of gas
2- Gas supply main shtoff manual valve (field supplied)
3- Gas supply pressure test point (field supplied)
4-Valve
5- Gas burner manifold test point
GAS SUPPLY PRESSURE RANGES:
NATURAL GAS PRESSURE:
min. 5” wc - max. 7” wc
LP PROPANE GAS PRESSURE
min. 12” wc - max. 14” wc
TOP VIEW OF GAS CONTROL
FIELD SUPPLIED RIELLO SUPPLIED
1 2 3 4 5
D7343

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INSTALLING THE BURNER
A) Burner Chassis
B) Combustion Head Assembly
1) Locking Nut
2) Mounting Plate surface
3) Insulation Gasket
Separate the combustion head of the burner from the chassis
(A) by removing the locknut (1). Install the combustion head
into the boiler.
Typical insertion depth, the front edge of the combustion head
is flush with the inside surface of the appliance mounting sur-
face (2).
Use this checklist prior to installation:
1) Check the input/output requirements of the appliance.
We suggest that the appliance output should be ap-
proximately 85% of input (85% efficiency).
2) Check the dimensions of the combustion chamber for correct sizing against the input requirements of the application.
3) Check that there is sufficient air for proper combustion and adequate ventilation.
Local codes should be followed. In the absence of local codes, refer to the NFPA Manual No. 31, CAN/CGA
B149.1 &. 2, ANSI Z223.1-1984 and Addendum 221.8A 1989.
4) Check that you have adequate space for servicing the equipment.
The Riello burner requires a minimum of 13 inches clear space behind the red cover.
This is required to allow easy removal of the cover for servicing and periodic maintenance.
5) Check that the chimney is of sufficient area to handle the exhaust gases.
Make sure the chimney is clear and there are no obstructions.
6) Barometric draft regulators must be of the double acting type, and must be installed in accordance with the
draft regulator manufacturer's instructions.
Single acting barometric dampers are not permitted.
For further clarification, refer to ANSI Z21.8-1984 and Z21.17A-1993.
IMPORTANT:
A vent shutoff system shall be applied to a barometric damper installed in the venting system at the
time of conversion of the appliance.
This will electrically disconnect the burner should there be a blockage in the vent (chimney).
The installer must identify the main electrical power switch and manual gas shut off valve, for emergency
conditions. The burner cover must be in place and secured before the burner is placed in operation.
13 2
AB

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INSTALLATION OF SEDIMENT TRAP AND BURNER SUPPLY
Gas piping to the burner must be 1/2-inch minimum. Install only a full-ported shutoff valve. The valve must be lo-
cated outside the appliance jacket, and the pressure gauge port must be accessible.
PRESSURE TEST-OVER 1/2PSIG.
The appliance and its individual shutoff valve must be disconnected from the gas supply piping system during any
pressure testing of the system at a test pressure in excess of 1/2PSIG.
PRESSURE TEST-1/2PSIG OR LESS
The appliance must be isolated from the gas supply piping system by closing its individual manual shutoff valve
during any testing of the gas supply piping system at test pressures equal to or less than 1/2PSIG.

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FACTORY WIRING DIAGRAM
NOTE:
The SAFETY SWITCH on the 525SE CONTROL BOX is
equipped with a contact allowing remote sensing of burner
lockout.
The electrical connection is located on the CONTROL BOX ter-
minal 4 as indicated. Should burner lockout occur, the 525SE
CONTROL BOX will supply a power source of 120 Vac to the
connection terminal.
The maximum allowable current draw on this terminal is 1A.
Blue
White
Black
D4703
LEGEND
C- Capacitor
CN... - Connectors
E- Ignition electrode
MB - Terminal board
MV -Motor
PA - Air pressure switch
SO - Ionization probe
TB - Burner earth
TV - Transformer 24V
Brown
Control box
Remote
lock-out
signal
Fuse Fuse
Service
D4704
switch
Service
switch
120V controlled 24V controlled
Operating
control
TB
TB
Operating
control
FIELD WIRING DIAGRAM
IMPORTANT:
Terminal 4 is to be used only for the connection of a
remote sensing device.
If a neutral or ground lead is attached to terminal 4,
the control box will be damaged should lockout occur.

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SETTING UP THE BURNER
After burner output has been determined, use TABLE 1 below AS AN INITIAL GUIDE for burner settings.
All settings in this table were obtained under the following conditions.
O0 (zero) draft in the combustion zone; OStandard lab test boiler;
OInlet gas pressure range as in table 1; OSteady state (HOT) operating conditions.
Burner input decreases with increasing the combustion chamber pressure.
Once installed, a higher or lower burner input can be achieved by raising or lowering the manifold pressure from - 0.5”
wc. to +1.5” wc. Pressure changes can only be made when the burner is running. The typical working manifold pressure
is 3.5” wc. (both for natuaral gas and propane).
STEP BY STEP PROCEDURE
1) Set air gate. See AIR GATE ADJUSTMENT on page 11.
2) Set gas orifice and combustion head.
See ORIFICE INSTALLATION AND COMBUSTION HEAD SETTING on page 12.
3) Set the manifold pressure using the following method.
a) In order to determine existing manifold pressure, start the burner.
At the end of the prepurge cycle (approx. 30s), the gas valve is energized.
During the 5 sec. trial for ignition, note the observed manifold pressure. If the burner lights and continues to
run, go to step (d).
b) Compare the observed manifold pressure from step (a) to the required value from TABLE 1.
c) Repeat step (a), making adjustments to the gas valve, until flame is established.
d) Once flame has been established, set your manifold pressure to the desired value from TABLE 1.
4) Check combustion gases using proper combustion analysis equipment to ensure safe levels of CO2and CO
during appliance heat up.
The gas valve should be used to make any necessary adjustments to ensure safe combustion.
At this point do not adjust the air or head settings unless absolutely necessary.
5) Allow burner to run until normal operating temperatures and conditions have been achieved.
6) a) Clock the gas meter to determine actual burner output.
b) Set the manifold pressure, by adjusting the gas valve, to achieve desired output.
c) Check combustion gases once again to ensure safe operation.
Make sure the burner cover is in place and air gate locking screws are secure for all combustion analysis.
Adjust air gate if necessary (refer to page 11). A qualified technician must do this test.
The maximum recommended CO2level for natural gas is 10%; the maximum recommended level for pro-
pane gas is 12%. The recommended flue gas temperature is from 350°F to 550°F.
7) After completing the adjustments, remove the manometer and tighten the screw inside the manifold test point.
Replace the regulator cap on the gas valve.
8) Complete the adjustment data tag, described on page 15.
Explain the burners essential functions (starting and stopping) to the owner.
Do not forget to give the dealer or service company's name and address.
Please see page 15 for information on burner maintenance procedures.
NOTE: Do not assume the heating system is operating at optimum performance.
THERE IS NO SUBSTITUTE FOR PROPER COMBUSTION TESTING!
OPERATING FAULTS
Gas inlet
pressure range Orifice Manifold gas pressure
Burner
output
Head
setting
Air gate
setting
“wc Marking “wc Btu/hr Nocth Notch
NATURAL GAS
5.0 - 7.0
B1
3.5
75,000 0 1.5
B2 95,052 0 1.85
B3 114,589 1 1.9
B4 139,010 2 2.0
B5 159,673 3 2.3
B6 200,000 4 3.75

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The integrated control system is self-checking.
The cycle from start up to flame establishment, takes approximately 70 seconds.
The burner will go into lockout under the following circumstances:
a) Burner fails to ignite;
b) The ionization probe is grounded;
c) Opening of the air pressure switch or the normally open contacts of the air pressure switch not making.
Should overheating of the appliance occur, shut off the manual gas valve to the burner.
Do NOT shut off the switch to the circulating pump or blower fan.
SHUT DOWN PROCEDURE
Switch off electrical power to the unit. Close the manual supply gas valve.
START UP PROCEDURE
See page 7.
NOTE:
If an external electrical source is utilized, the conversion burner, when installed, must be electrically ground-
ed in accordance with local codes.
In the absence of local codes, refer to the National Electrical Code, ANSI/NFPA 70-1990.
In Canada follow the Canadian Electrical Code Part 1 CSA C22.1.
AIR GATE ADJUSTMENT
To regulate the combustion air, adjust the manual air gate (3), by
loosening the locking screws (4).
Once the optimal adjustment is reached, tighten the locking
screws (4).
EXAMPLE SETTING - (for natural gas)
To set the air intake for a desired burner output of 114,500 Btu/hr,
use TABLE 1 to determine the correct air gate setting.
In this case, the setting would be 1.9 for natural gas.
Turn the manual air gate (3) until the arrow points to 1.9 on the
scale.
Tighten locking screws (4).
All settings in TABLE 1 are obtained with zero (0) pressure in the
combustion zone and at normal operating temperatures. i.e.,
steady state hot conditions.
Note:
Burner must be fired ONLY with fuel that is listed on the burner serial label.
3
D5231
44

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ORIFICE INSTALLATION AND COMBUSTION HEAD SETTING
A proper orifice (C) has to be installed in
the combustion head gas line, according to
TABLE 1. A complete set of gas orifices is
delivered with the burner packaging as
equipment. The burner leaves the factory
with the A3 orifice already installed. In
case another orifice has to be installed, fol-
lowing the instructions below.
To remove the drawer assembly from the
manifold (B), follow the procedure below:
1) Disconnect 24v leads at the gas valve.
2) Separate the burner chassis from the
combustion head by removing the lock-
nut.
3) Loosen the two Allen screws (A) with-
out taking them out.
4) Withdraw the head, turning it 180
degrees.
5) Pull out head, leaning it towards the bottom.
6) Remove the ignition electrode (D) and the ionization probe (E).
7) Unscrew the screw (F) and remove the gas diffuser (G).
8) Install the proper orifice (C) and seal according to TABLE 1.
9) Refit following the above procedure in the reverse order (verify the ignition electrode and the ionization probe
positions according to page 5).
Slide the elbow (B) so that the number on the indicator scale aligns with the back edge of the air tube.
See TABLE 1 for set points. Tighten the two Allen screws (A).
Example (for natural gas):
For a desired burner output of 114,500 Btu/hr, the orifice would be B3 and the combustion head setting would be 1.
All settings in TABLE 1 are obtained with zero (0) pressure in the combustion zone and at normal operating tem-
peratures. i.e.; steady state hot conditions.
Note: Burner must be fired ONLY with fuel that is listed on the burner serial label.
MANIFOLD PRESSURES
Manifold gas pressure for various firing rates should be set by adjusting the gas regulator of the gas valve, (see
figure at page 6). To check manifold gas pressure, attach a manometer to the manifold test point, shown on typical
gas train layout. Approximate manifold pressure settings are indicated in TABLE 1.
Example (for natural gas):
For a burner to be fired at 114,500 Btu/hr, the manifold pressure would be approximately 3.5" wc.
In case of lower or higher manifold pressure, install an orifice with a respectively smaller or bigger hole.
All settings in TABLE 1 are obtained with zero (0) pressure in the combustion zone and at normal operating tem-
peratures. i.e.; steady state hot conditions.
Note: Burner must be fired ONLY with fuel that is listed on the burner serial label.
HIGH ALTITUDE SETTINGS
It should be noted that for higher altitudes more air for combustion is required.
All settings in this manual have been obtained at approximately sea level. Special attention should be paid to air
for combustion for elevations above sea level. If an increase in combustion air is insufficient, the burner must then
be de-rated by approximately 4% for every 1000 feet above sea level.
B
D7349
C
A
D E
F
G

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PRESSURE WORKING CHART
The chart below shows effects of pressure in the combustion zone on the minimum/maximum burner outputs. In
this example, with a maximum operating pressure of 0.16 inches water column in the combustion zone, you will be
able to obtain a maximum of 165,500 Btu/h burner output.
Any change from zero (0) pressure in the combustion zone will affect the Btu output of the burner. To supply the
required input to the appliance, manifold pressure will have to be adjusted to compensate for this condition.
NOTES:
1) Sizes shown above are for cylindrical or wet base boilers, or air cooled heat exchangers.
2) To size the chamber in applications other than wet base boilers, refer to the authority having jurisdiction.
Refer to CAN/CGA B149.1 &. 2, ANSI Z21.8-1984, and ANSI Z223-1-1984.
3) Fire brick or cerafelt chamber materials should have a continuous run temperature rating of 2400 degrees Fahr-
enheit and a melting point of 3000 degrees Fahrenheit.
PRESSURE WORKING CHART
Natural and Propane Gas
Pressure
In/wc M/bar
Btu/h
kW/h
0.32
0.24
0.16
0.08
0.0
0.8
0.6
0.4
0.2
0.0
10 20 30 40
34,000 68,000 137,000 171,000
D7411
0.40 1.0
102,000 205,000
6050

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COMBUSTION CHECKS
CO2
It is advisable not to exceed a measured reading of 10% CO2for Natural Gas or 12% CO2for Propane Gas.
CO
For safety reasons, the value of .02% (200ppm) free air sample must not be exceeded.
IONIZATION CURRENT
The minimum amount of current necessary for
the control box to operate properly is 3 micro
Amps DC.
To measure the ionization current, disconnect
the red wire connector and insert a DC microme-
ter in series with control box terminal 2 and the
ionization probe, which senses the flame. Refer
to the diagram below.
BURNER START-UP CYCLE
PROBLEM SOLVING GUIDE
Burner starting difficulties and their causes:
1) The burner goes through the prepurge period normally. The flame ignites, but the burner goes to lockout within
five seconds.
a) The phase/neutral lines are reversed.
b) The wiring to ground is absent or ineffective.
c) The ionization probe is grounded, or not in contact with the flame, or the circuit to the control box is broken.
d) The spark interferes with the flame signal due to incorrect setting of the electrode.
2) The burner goes to lockout after the prepurge period because the flame does not ignite.
a) Air has not been fully bled from the gas lines.
b) The gas valve is passing too little gas.
c) The spark is irregular or not present.
3) The burner does not start when the thermostat calls for heat.
a) The gas pressure switch (if supplied) does not close contact due to low gas pressure.
b) The 24 volt switching relay is defective.
c) The line switch is off.
d) There is a blown fuse in the panel.
e) Terminals on the control module are bent or loose
f) The motor is defective.
g) The capacitor is defective.
h) The end switch on the air damper is defective.
i) The control box is defective.
j) The air pressure switch is not in the normally closed position.
Ionization probe
Red wire connect
Control box
terminal block
D5006
2
Normal Lock-out, due to light-failure
Thermostat
Motor
Ignition transformer
Valve
Flame
Lock-out
30s min. 5s max. 30s min. 5s max.
D5048
Thermostat
Motor
Ignition transformer
Valve
Flame
Lock-out

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4) The burner continues to repeat the starting cycle without going into lockout.
This is a very specific situation caused when gas pressure in the gas main lines is very close to the value at
which the gas pressure switch has been set. This can be corrected by resetting the gas pressure switch to a
lower level. The gas pressure switch, if required, may be supplied, or may have to be field installed.
5) The burner does not go through prepurge, and the control module goes to lockout. The air pressure switch does
not change over from normally closed to normally open contacts.
This condition exists because there is insufficient air pressure in the combustion head.
OWNER INFORMATION AND ROUTINE MAINTENANCE
SAFETY LOCKOUT
This burner is equipped with multiple interlocking safety devices. In the event of a failure in the flame, or any
blockage of the combustion air supply, the burner will "lock out" in a safety condition. In such an event, an
illuminated red button will show on the centre front of the red cover. To restart the burner, press the button once
only. Should the burner return to the lock out condition, call a qualified service technician or your gas company for
assistance.
NOTE: Keep the area around the burner free and clear of all combustible materials, gasoline and other flammable
vapours and liquids. Do not allow any obstructions, which may prevent the free, flow of air to the burner.
MAINTENANCE
Like all precision equipment, your burner will require periodic maintenance. At an interval of 2 months, you should:
1) Visually check the flame if your heating appliance has an observation port.
2) Check and clean the air intake louver to remove any builds up of fluff, dust, pet hair etc.
3) The motor is permanently lubricated and does not need oiling.
For any maintenance or repairs over and above those listed, contact your service technician or gas company.
THERE ARE NO OWNER SERVICEABLE PARTS INSIDE THE BURNER COVER.
Once a year, you should have the burner serviced as indicated below. This service should be performed by your
local authorized Riello dealer.
1) Check burner distributor head and mixing plates. Clean if necessary.
2) Check ignition electrode. Clean, adjust, or replace as necessary.
3) Check the flame sensor rod (ionization rod) for dirt or carbon build up. Clean, adjust, or replace as necessary.
4) Check manifold gas pressure.
5) Check all burner adjustments.
6) Generally clean all exposed parts and components.
7) Do a complete combustion test with the burner cover in place and the air gate locking screws secure.
Your Riello 40 gas burner is only part of your heating system.
Once every year you should have your heating appliance serviced by a
qualified service technician.
You should also have the chimney checked, and cleaned if necessary.
INSTALLATION DATA
Note:
This label is supplied in the package with the burner and should be
filled out and affixed to the appliance when the conversion burner is
installed.

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PROPANE BURNER APPLICATION
The burner leaves the factory to run on
natural gas. It is available a kit, on
request, that allows the burner to run on
propane.
TECHNICAL FEATURES
The thermal output and operating range
of burners converted to use propane are
the same as for burners running on natu-
ral gas.
GAS Family 3:
Net calorific value: 24 - 34 kWh/m3
21,000 ÷ 29,300 kcal/m3
Min. pressure 25 - max. 50 mbar.
LIST OF KIT’S COMPONENTS
CONVERSION
On the combustion head of the burners, diaphragm (4)
should be replaced, and natural gas nozzle (1) replaced
with the one used for propane, and a reducer (3) should be
added.
Proceed as follows, (fig. A):
³Disassemble the ignition electrode and the ionisation probe.
³Replace diaphragm (4) and replace natural gas nozzle (1) (marked 2) with the one supplied used for propane
(marked 1.3).
³Remove the distributor - diffuser disc once the screws have been removed.
³Insert reducer (3), refit the distributor-diffuser disc and then tighten the fastening screws.
³
Reassemble the electrode and the ionisation probe in the position foreseen in the instructions for the natural gas.
³Affix the adhesive label as illustrated in fig. B.
Quantity Component
1
1
1
1
4
Reducer
Diffuser 1,3
Adhesive label
Instruction
Diaphragm
1
2
3
4
D7345
Fig. A
Fig. B
Adhesive data plate
supplied as equipment
D4005

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SETTING UP THE BURNER
After burner output has been determined, use TABLE below AS AN INITIAL GUIDE for burner settings.
All settings in this table were obtained under the following conditions.
O0 (zero) draft in the combustion zone; OStandard lab test boiler;
OInlet gas pressure range as in table; OSteady state (HOT) operating conditions.
Gas inlet
pressure range Orifice Manifold gas pressure
Burner
output
Head
setting
Air gate
setting
“wc Marking “wc Btu/hr Nocth Notch
PROPANE
12.0 - 14.0
B11
3.5
75,000 0 1.5
B12 91,529 0 1.8
B13 108,341 1 1.5
B14 129,822 2 2
B15 158,776 3 2.25
B16 200,000 4 3.5

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SPARE PARTS

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SPARE PARTS LIST
No. CODE DESCRIPTION No. CODE DESCRIPTION
13007238 Burner back cover 20 3950271 Short combustion head (278T1)
23020227 Air pressure switch 21 3006695 Drawer assembly elbow
33002307 Primary control sub-base 22 3007273 Electrode assembly
43001162 Primary control box 525 SE/A 23 3007265 Electrode & ionization clamp
53007305 120/24 Volt transformer 24 3020205 Ionization assembly
63007288 Air switch tube and connector 25 3006900 Natural gas orifice
73007310 Ionization lead 26 3006899 Distributor head and mixing plate
83007292 Air tube cover plate 27 3007297 Manifold
93006687 Chassis mounting collar 28 3006394 End cone
10 3007448 Ground lead and connector 29 3005447 Gas test point
11 3007204 Manual air shutter (air gate) 30 3000870 Hinge assembly
12 3005708 Fan 31 3020228 Drawer assembly diaphragm
13 3005834 Capacitor 10µF
14 3005843 Burner motor
15 3005856 Mounting gasket 33 3950272 Long combustion head (278T2)
16 3005855 Universal mounting flange 34 3006695 Drawer assembly elbow
35 3007274 Electrode assembly
36 3007265 Electrode & ionization clamp
37 3020206 Ionization assembly
38 3007298 Manifold
39 3007289 Natural gas tube
40 3005854 Semi flange 2 required
41 3006394 End cone
42 3007281 End cone adapter
ACCESSORIES AND GAS TRAIN 43 3006900 Natural gas orifice
C7010003 Mounting bracket transformer 44 3006899 Distributor head and mixing plate
Honeywell VR8305M2102 solenoid 45 3007303 Electrode support
46 3007284 Air tube -long
47 3005447 Gas test point
48 3000870 Hinge assembly
49 3020228 Drawer assembly diaphragm