Weil-McLain CG50 - Manual (Page 3)

Burner Specification & Data sheet — Beckett Gas Burners
3 Part No. 550-142-027/0508
Standard motor voltage is 120/60/1 for CG10, CG25 , and 1.
230/60/1 for CG50.
Direct Spark Ignition is standard on all models.
2.
CG10 models are available only as OO (On-Off operation) or 3.
LFS (Low fire start, high fire run. Single position air, adjust-
able opening gas valve).
CG25 and CG50 are available as: LHL Low-high-low-off
4.
operation. Two position air controlled by linkageless damper
actuator, fixed damper pre-purge.
Must be wired with boiler temperature or pressure control •
switch or operation will be low-high-off.
MOD – On-off operation with proven low fire start and
•
full modulating firing conditions with combustion air
control.
Modulation control drives combustion air damper and
•
fuel metering valve in response to boiler demand. Fixed
damper pre-purge for RM 7897C.
Open damper pre-purge for RM7840L.
•
Burner capacities listed for elevations up to 2,000 feet. For
5.
higher elevations, consult local Weil-McLain distributor/
agent or sales office.
Gas ratings based on natural gas with heating value of 1,000
6.
btu per cubic foot and specific gravity of 0.60.
Boiler-burner unit to be adjusted to achieve +0.10 inches
7.
W.C. pressure at flue collar, resulting in positive pressure in
firebox as listed.
Minimum gas pressures listed are subject to variations due 8.
to job conditions. Gas burners for other gas pressures are
available. Consult local Weil-McLain distributor/agent or
sales office.
Gas manifold pressures shown are for initial start-up. Final
9.
pressure should be determined after checking actual gas flow
and combustion readings.
Combustion Controls:
10.
RM7897 flame safeguard control uses ultraviolet elec- a.
tronic flame detector to monitor gas burner flame, and
provides pre-purge programming. “C” models provide
10 second main flame establishing period.
RM7840L flame safeguard control monitors the gas
b.
burner flame, provides pre-purge and post-purge pro-
gramming, provides switching necessary to allow firing
rate motor to be driven to both low fire start and high fire
positions, prevents start-up if preignition interlock circuit
or running interlock circuit does not “prove”, system will
lock out on safety. Ultraviolet sensitive electronic flame
detector is standard.
Burners listed by Underwriters Laboratories, Inc., Canadian 11.
Gas Association, state of Connecticut, Fire Marshal state of
Massachusetts, city of New York MEA, and others.
Special controls can be provided to meet other code require-
12.
ments not listed. Consult your local Weil-McLain distributor/
agent or sales office.
Notes for Table 1 and Table 2
Burner specifications and settings
(continued)
Gas train components and flame safeguards Table 2
Standard Gas Control Components and Sizes in Inches
Boiler
Model
Number
Manual
Hand Valve
(Field Gas Train
Connection)
Combination
Diaphragm
Operating Gas Valve
And Regulator
Safety
Gas Valve
Manual Checking
Gas Valve
488R-488 1 1 1 1
588 & 688 1-1/4 1-1/4 1-1/4 1-1/4
788-988 1-1/2 1-1/2 1-1/2 1-1/2
1088R-1288 2 2 2 2
1388 2-1/2 2-1/2 2-1/2 2-1/2
Flame Safeguard Provided with Listed Control Systems by Code
Boiler
Model
Number
UL/ CSD1 FM IRI
OO or LFS LHL MOD OO or LFS LHL MOD OO or LFS LHL MOD
488R-488 RM7897A -- -- RM7897A -- -- RM7897A -- --
588-1388 -- RM7897C RM7840L -- RM7897C RM7840L -- RM7897C RM7840L
Additional control suppliers are available