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Gas–fired boiler
LGB
Control Supplement
Series 2 – Propane gas
CSD-1 Control System
Contents
I. New installation .......... 2
II. Existing installation .... 4
III. Water and steam trim
components .................. 4
IV. Gas piping ................... 5
V. Wiring ........................... 5
Sequence of operation ..... 8
Wiring procedure .............. 8
VI. Leak test procedure ... 10
VII. Operating instructions ..... 11
VIII.Parts list ..................... 12
Indicates presence of hazards th
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LGB-6 to LGB-20 Series 2 – Control Supplement I New installation 1. Remove all burners from base box assembly. Remove 3.95 mm natural gas main burner orifices in manifold. Install 2.40 mm propane gas main burner orifices. Use pipe dope sparingly only on male ends. Use pipe dope compatible with propane gases. Do not overtighten orifices. 2. Install pilot burners and flame sensor(s). See Figures 1 and 2 (page 3). Follow Table 1, below for electronic pilot burner (UCS), standing pilot burner (Q327)
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CSD-1 Control System – Propane gas I New installation – continued Figure 1 Pilot burner assembly, typical Figure 2 Main flame sensor assembly Part Number 550-141-816/0798 3
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LGB-6 to LGB-20 Series 2 – Control Supplement II Existing installation Conversion from natural gas to propane gas This conversion is to be installed by a Weil-McLain distributor or other qualified agency in accordance with the manufacturer’s instructions and all codes and requirements of the authority having jurisdiction. Failure to follow instructions could result in serious injury or property damage. The qualified agency performing this work assumes responsibility for this conversion. For your
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CSD-1 Control System – Propane gas IV Gas piping 1. Contact gas supplier to size pipes, tanks and regulator. a. Inlet gas pressure to manual main shut-off gas valve — minimum 11” W.C., maximum 13” W.C. b. If pressure to gas valve exceeds 13” W.C., install 100% lock-up gas pressure regulator upstream of hand valve. 2. Remove gas supply knockout disc from jacket panel. 3. Follow good piping practices. 4. Pipe joint compound (pipe dope) must be resistant to corrosive action of liquefied petroleum g
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LGB-6 to LGB-20 Series 2 – Control Supplement CSD-1 Control System – Propane gas Figure 3 EQUIPMENT LADDER WIRING DIAGRAM SCHEMATIC WIRING DIAGRAM H N GROUND STEAM 120 V.A.C. (NOTE 9) Wiring diagram MANUAL LOW WATER MANUAL NO.1 RED FLAME FAILURE LAMP LIMIT CIRCUIT SERVICE SWITCH OPERATING CUT-OFF RESET RESET HIGH MANUAL MANUAL (BY OTHERS) CONTROL (STEAM ONLY) LWCO HIGH LIMIT LIMIT OPERATING LOW WATER RESET HIGH RESET PRIMARY CONTROL CUT-OFF LWCO LIMIT HIGH LIMIT PILOT PROVING MAIN FLAME MODULE M
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LGB-6 to LGB-20 Series 2 – Control Supplement V Wiring – continued Sequence of operation 1. Operating control begins startup sequence. a. Limit control contacts are closed. 2. Pilot proving module energized. a. Pilot solenoid opens. b. Pilot ignition spark begins. c. Pilot ignites. d. Pilot proves. On failure to sense pilot flame, the pilot-proving module will wait 5 minutes, then retry for ignition. Upon 2 consecutive pilot flame failures, the control will lockout and illuminate the red lockout
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CSD-1 Control System – Propane gas Figure 5 Field wiring diagram Part Number 550-141-816/0798 9
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LGB-6 to LGB-20 Series 2 – Control Supplement VI Leak test procedure 1. Remove red (MV) and blue (PV) wires from main gas valve. 2. Close main test firing valve attached to the manifold. 3. Check that both leak test valves are closed and remove plugs. 4. Attach manometer to first leak test valve. 5. Open first leak test valve and check for pressure. 6. Close first leak test valve and remove manometer. 7. Attach manometer to second leak test valve. 8. Apply call for heat to boiler. 9. Check that
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CSD-1 Control System – Propane gas VII Operating instructions A. This boiler is equipped with a pilot which must be lighted by hand. When lighting the pilot, follow these instructions exactly. The gas supply to this pilot is controlled by Pilot switch box. This boiler is also equipped with an ignition device which automatically lights a second pilot. The gas supply to this pilot is controlled by the Gas control. Do not try to light this pilot by hand. B. BEFORE OPERATING THE MANUAL PILOT, smell
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LGB-6 to LGB-20 Series 2 – Control Supplement VIII Parts list Figure 6 Ref. No. Description Size Vendor/Part Number Weil-McLain Part Number 1 Main flame sensor Honeywell 392956 511-724-274 Main burner with pilot bracket Weil-McLain 512-200-055 2 Main flame sensor bracket Weil-McLain 423-300-420 1" Kinco-Balon 500 511-246-325 3 Manual main shut-off valve 1 ¼" Kinco-Balon 600 511-246-330 1" Honeywell V8943A1003 511-044-191 4 Secondary gas valve 1 ¼" Honeywell V8943A1111 511-044-192 1" Honeywell V8
