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LGB
Control Supplement
Flame Guardian
RM7895C Controller Electronic Pilot System
IRI
Indicates presence of hazards that can cause severe personal injury, death or
substantial property damage.
Indicates special instructions on installation, operation or maintenance that
are important but not related to personal injury or property damage.
This Control Supplement must only be used by a qualified installer/service
technician. Read these instructions completely before beginning the
installation. Failure to follow these instructions can cause severe personal
injury, death or substantial property damage.
Gas–fired boiler
WMBC-1A
Contents
I. Installation ..................... 2
II. Gas piping ...................... 5
III. Wiring ............................. 5
IV.Startup ......................... 10
V. Sequence of operation 11
VI.Parts list ....................... 12
Part Number 550-141-807/0298
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Summary of Contents for Weil-McLain FLAME GUARDIAN WMBC-1A
- Page 1 Control Supplement Flame Guardian RM7895C Controller Electronic Pilot System Indicates presence of hazards that can cause severe personal injury, death or substantial property damage. Indicates special instructions on installation, operation or maintenance that are important but not related to personal injury or property damage. This Control Supplement must only be used by a qualified installer/service technician.
- Page 2 4. Reinstall burner assemblies. See Table 1 for pilot burner and flame sensor locations. 5. Assemble control panel to boiler. See Figure 1. 6. Install gas controls as shown in Figure 4, page 4. 7. IRI installations require manual reset controls. Weil-McLain recommends installing manual Table 1 Pilot burner and flame sensor...
- Page 3 Flame Guardian WMBC-1A Electronic Pilot System – IRI Installation Figure 2 Q179 pilot burner assembly LGB-A56 Figure 3 Main flame sensor assembly LGB-A85 Part Number 550-141-807/0298 – continued Sensor Igniter Locating Slot Burner Support Bar Pilot Line Tubing Sensor Lead...
- Page 4 Installation Figure 4 IRI gas train schematic 1 Manual main shut-off gas valve 2 Low gas pressure switch 3 Pilot manual shut-off valve 4 Motorized gas valve w/ on/off actuator 5 Pilot gas pressure regulator 6 Normally open solenoid vent valve 7 Pilot solenoid gas valve 8 Test cock 9 Second motorized gas valve w/ on/off actuator...
- Page 5 Flame Guardian WMBC-1A Electronic Pilot System – IRI Gas piping 1. Size gas piping considering: a. Diameter and length of gas supply piping. b. Number of fittings. c. Maximum gas consumption (including any possible future expansion). d. Allowable pressure drop from gas meter outlet to boiler. For pressure drops, see ANSI-Z223.1 – latest edition.
- Page 6 (Series 2) — Control Supplement Flame Guardian WMBC-1A Electronic Pilot System – IRI Figure 5 — WMBC-1A panel wiring schematic Part Number 550-141-807/0298 Part Number 550-141-807/0298...
- Page 7 (Series 2) — Control Supplement Figure 6 — WMBC-1A panel wiring diagram – factory wiring Part Number 550-141-807/0298...
- Page 8 Flame Guardian WMBC-1A Electronic Pilot System – IRI Figure 7 — WMBC-1A field wiring diagram Part Number 550-141-807/0298...
- Page 9 Start-up Turn off electrical power supply and gas supply to boiler before making the following connections and adjustment. Failure to do so can cause severe personal injury, death or substantial property damage. 1. Disable high fire by disconnecting the blue wire in the two-stage gas valve. 2.
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Page 10: Sequence Of Operation
Flame Guardian WMBC-1A Electronic Pilot System – IRI Sequence of operation 1. Operating control begins startup sequence: 2. Flame safeguard control pilot circuit energizes after 2.0 seconds. 3. Flame safeguard control energizes main flame circuit: 4. Ignition transformer de-energizes after 10-second trial for ignition. - Page 11 Honeywell V4295S Honeywell 32002513 1" Honeywell V4944N1011 1 ¼" Honeywell V4944N1029 1 ½" Honeywell V4944N1037 2" Honeywell V4944N1045 * Listed part can be purchased at local supply house Weil-McLain Part Number 510-350-431 510-350-432 510-350-434 510-311-012* 510-350-430 511-044-040* 511-624-550* 511-624-555* 511-210-415* 511-330-181*...