Weil-McLain CG25, CG50, CG10 manual Gas train components and flame safeguards

Burner Specification & Data sheet — Beckett Gas Burners

Burner specifications and settings (continued)

Table 2

Gas train components and flame safeguards

Standard Gas Control Components and Sizes in Inches

Boiler

Manual

Combination

Safety

Manual Checking

Model

Hand Valve

Diaphragm

Gas Valve

Gas Valve

Number

(Field Gas Train

Operating Gas Valve

Connection)

And Regulator

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

UL/ CSD1

FM

IRI

Model

OO or LFS

LHL

MOD

OO or LFS

LHL

MOD

OO or LFS

LHL

MOD

Number

488R-488

RM7897A

--

--

RM7897A

--

--

RM7897A

--

--

588-1388

--

RM7897C

RM7840L

--

RM7897C

RM7840L

--

RM7897C

RM7840L

Additional control suppliers are available

Notes for Table 1 and Table 2

1.Standard motor voltage is 120/60/1 for CG10, CG25 , and 230/60/1 for CG50.

2.Direct Spark Ignition is standard on all models.

3.CG10 models are available only as OO (On-Off operation) or LFS (Low fire start, high fire run. Single position air, adjust- able opening gas valve).

4.CG25 and CG50 are available as: LHL Low-high-low-off 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.

5.Burner capacities listed for elevations up to 2,000 feet. For higher elevations, consult local Weil-McLain distributor/ agent or sales office.

6.Gas ratings based on natural gas with heating value of 1,000 btu per cubic foot and specific gravity of 0.60.

7.Boiler-burner unit to be adjusted to achieve +0.10 inches W.C. pressure at flue collar, resulting in positive pressure in firebox as listed.

8.Minimum gas pressures listed are subject to variations due to job conditions. Gas burners for other gas pressures are available. Consult local Weil-McLain distributor/agent or sales office.

9.Gas manifold pressures shown are for initial start-up. Final pressure should be determined after checking actual gas flow and combustion readings.

10.Combustion Controls:

a.RM7897 flame safeguard control uses ultraviolet elec- tronic flame detector to monitor gas burner flame, and provides pre-purge programming. “C” models provide 10 second main flame establishing period.

b.RM7840L flame safeguard control monitors the gas 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.

11.Burners listed by Underwriters Laboratories, Inc., Canadian Gas Association, state of Connecticut, Fire Marshal state of Massachusetts, city of New York MEA, and others.

12.Special controls can be provided to meet other code require- ments not listed. Consult your local Weil-McLain distributor/ agent or sales office.

Part No. 550-142-027/0508 3