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Weil-McLain 88 Water and Steam Boilers — Series 2 — For Gas, Light Oil, & Gas/Light Oil-Fired Burners
2 Part No. 550-142-025/0508
Burner specifications and settings
Burner data — Natural gas — ModulatingTable 1
Boiler
Model
Number
Burner
Model
Number
Pressure
Drop Thru
Gas Train .
Manifold
Pressure
Gas Pressure Required at
Gas Control Inlet
Gas Pilot
Pressure
Combustion
Head
Setting
Combustion
Air Settings
Servo Motor Cam
Position Settings
Min Max
Inches W.C. Inches W.C. Inches W.C Inches W.C Inches W.C.
488R RS28/M 0.75 3.30 4.05 14 5.00 3 27 52 0 22 90 — — —
488 RS28/M 0.75 3.60 4.30 14 5.00 4 27 52 0 22 90 — — —
588 RS38/M 1.30 3.70 5.00 14 5.00 2 17 70 0 25 90 — — —
688 RS50/M 1.83 2.90 4.73 14 2.70 3 16 65 0 18 90 — — —
788 RS50/M 2.40 3.50 5.85 14 2.50 4 28 85 0 20 90 — — —
888 RS70/M 2.98 3.70 6.63 14 8.25 3 2.5 7.0 — — — 130 0 35
988R RS70/M 3.16 3.87 7.03 14 8.25 4 2.5 7.5 — — — 130 0 35
988 RS70/M 3.16 4.10 7.28 14 8.25 5 2.5 7.5 — — — 130 0 35
1088R RS70/M 3.00 4.65 7.65 14 6.50 8 3.0 8.5 — — — 130 0 40
1088 RS70/M 3.00 4.90 7.90 14 6.50 9 3.0 8.5 — — — 130 0 40
1188 RS100/M 3.80 3.10 6.90 14 6.50 4 2.5 6.0 — — — 130 0 35
1288 RS100/M 3.82 3.63 7.45 14 7.50 4 3.0 6.5 — — — 130 0 35
1388 RS100/M 2.41 4.50 6.91 14 7.60 3 2.5 9.0 — — — 130 0 30
1488 RS130/M 3.76 3.30 7.01 14 7.80 5 2.0 7.0 — — — 130 0 50
1588 RS130/M 4.09 3.50 7.59 14 7.20 7 2.5 7.0 — — — 130 0 50
1688R RS130/M 3.19 3.45 6.64 14 7.20 8 2.5 8.5 — — — 130 0 30
1688 RS130/M 3.19 3.70 6.89 14 7.20 9 2.5 8.5 — — — 130 0 30
1788 RS130/M 3.70 4.80 8.50 14 7.20 9 2.5 9.0 — — — 130 0 55
1888 RS190/M 3.71 3.50 7.21 14 5.00 0 0.5 3.8 — — — 130 0 45
Burner capacities listed for elevations up to 2,000 feet. For higher eleva-1.
tions, consult local Weil-McLain distributor/agent or sales office.
Gas ratings based on natural gas with heating value of 1,000 Btu per 2.
cubic foot and specific gravity of 0.60. Gas burners for other gases are
available. Consult local Weil-McLain distributor/agent or sales office.
Boiler-burner unit to be adjusted to achieve +0.10 inches W.C. pressure 3.
at the flue collar, resulting in positive pressure in firebox as listed.
Minimum gas pressures listed are subject to variations due to job condi-4.
tions. Gas burners for other gas pressures are available. Consult local
Weil-McLain distributor/agent or sales office.
All settings and pressures shown are for initial start-up. Final values 5.
should be confirmed with combustion analysis.
Gas train sizes for models 488R to 1288 are based on a supply pressure 6.
to the regulator of 7 inches W.C. Gas train sizes for models 1388 to
1888 are based on a supply pressure to the regulator of 12 inches W.C.
Optional trains are available for other pressures upon request.
Gas Control Systems: 7.
OO: On - Off operation. Single-position air damper•
LHL: Low-high-low-off firing conditions – two-position air and fuel •
controlled by separate motor, open damper pre-purge.
MOD: On - Off operation with proven low fire start and full modulating •
firing conditions. Proportional motor drives fuel metering valve and
combustion air damper according to firing conditions; open damper
pre-purge.
120/60/1 control circuit is used for all burners. Control circuit trans-8.
former is available as an option.
Airflow safety switch is standard for all gas and combination gas/light 9.
oil units.
Burners will be completely assembled and wired (except gas train) and 10.
factory test-fired. Burners listed by Underwriters Laboratories, Inc.,
state of Connecticut, Fire Marshal state of Massachusetts, city of New
York MEA, and others.
Special controls can be provided to meet other code requirements not 11.
listed. Consult your local Weil-McLain distributor/agent or sales office.
Electric gas pilot will be furnished as standard equipment on all gas and
combination gas/light oil units.
Direct spark ignition is standard for light oil units. Direct spark ignition 12.
is available as an option for combination gas/light oil units. Consult
your local Weil-McLain distributor/agent or sales office.
All 3 phase models require a separate 120/60/1 control voltage supply.13.
Combustion Controls:14.
Sie
mens LFL 1.335 flame safeguard control monitors the oil or gas •
burner flame with visual diagnostic window, provides pre-purge and
post purge, provides switching necessary to allow firing rate motor to
be driven to both low fire and high fire positions, prevent start up if
pre-ignition interlocks are open and has low fire start proven circuit.
In the event pre-ignition interlock circuit or running interlock circuit
does not “prove”, system will lock out on safety. Ultra violet sensitive
electronic flame detector is standard.
All units require a single SPDT controller for LHL firing rate opera-15.
tion.
Modulating units 488R to 788 require a 120v bumping type signal or 16.
PID control for modulation.
Modulating units 888 to 1888 require a 4 – 20mA, 0 – 10vdc or 135 ohm 17.
signal for modulation.
Motor relay or contractor will be furnished on all units.18.
Notes for Table 1, Table 2 and Table 3