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Weil-McLain Gold CGa Troubleshooting standing pilot boilers11b

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Boiler Manual

Part Number 550-110-593/1099 51

Is 24VAC present across transformer terminals C & Y?

Is damper harness securely plugged in at both ends?

Secure connections.

Check for open thermostat, LWCO, high limit, spill switch or

rollout thermal fuse element contacts or check for loose

wire connections.

If LWCO, spill switch or rollout thermal fuse

element contacts are open, determine cause

and correct condition. Failure to do so will

cause severe personal injury, death or

substantial property damage.

Check/repair out of round stack section. Does vent damper

rotate open?

Is 24VAC present across transformer terminal C and yellow

wire on vent damper connector?

Is 24VAC present across gas valve terminals?

Open thermostat contacts for 30 seconds. Vent damper will

rotate to closed position. Close thermostat contacts. Vent

damper will rotate to open position. Is 24VAC present

across gas valve terminals?

Remove damper harness from

damper harness plug.

TEMPORARILY install jumper

between terminal 2 and

terminal 5 on damper plug in

boiler wiring harness. See

figure, right. Does boiler fire?

No Yes

No Yes

Chart 1 — Standing pilot —Boiler will not fire

Check for loose wire connections or bad relay on

transformer.

No Yes

Is vent damper rotated open?

No Yes

No Yes

Replace actuator.

Retest.

Check continuity of each wire in damper harness. Does

continuity exist for each wire? See Table below.

Replace damper

wiring harness.

Retest.

Replace gas valve.

Retest.

Is main flame on now?

No Yes

Retest

No Yes

No Yes

No Yes

No Yes

Replace damper

actuator. Retest.

Turn gas valve cock to

ON position. Retest.

Replace gas valve.

Retest

Is gas valve cock turned to ON position?

No Yes

Troubleshooting — standing pilot boilers11b

Damper harness

ContinuityTable

6 Pin Molex

Pin Number

4 Pin Molex

Pin Number

Pin side of connectors

1

2

3

4

5

6

1

3

4

N/C

2

N/C

59341

Contents

Main Please read before proceeding When servicing boiler Boiler operation Boiler water Installer Page How it works . . . Other boiler components: Boiler circulator Contents Hazard definitions Prepare boiler location codes & checklist 1a Installations must follow these codes: Before locating the boiler, check the following: Prepare boiler location clearances1b Service clearances Flooring and foundation Residential garage installation Small space installations Prepare boiler location vent system1c When removing boiler from existing common vent system: Chimney or vent requirements Prepare boiler location air contamination 1d Air from inside building Prepare boiler location air openings1c Special considerations Tight construction Prepare boiler placement and setup 2a Inspect orifices and burners Place boiler/crate near position Orifice replacement procedure 2b Prepare boiler pressure test Perform hydrostatic pressure test Page Prepare boiler vent damper installation Water piping general information3a General piping information Relief valve System water piping Pressure/temperature gauge 3b Water piping multiple zones Typical piping multiple-zone installations 3d Primary/secondary (preferred) bypass piping method Temperature gauges Primary/secondary (preferred) piping for radiant heating or converted gravity systems 3e Temperature gauges Boiler-bypass piping method Boiler-bypass (alternate) piping for radiant heating or converted gravity systems 3f System-bypass piping method System-bypass piping for converted gravity (or steam) systems 9 3g Gas piping Field wiring Electrical installation must comply with: Wiring connections Start-up preparation6a Determine if water treatment is needed Check for gas leaks Fill the system with water Inspect system water piping Start-up operate boiler6b Start-up preparation continued6a Inspect base insulation Start the boiler Start-up if boiler doesnt start . . .6c Check for: Start-up operate boiler continued6b Check system and boiler Start-up Check-out procedure checklist7 Installation and service certificate 34 Operation Standing Pilot CGa Lighting instructions CGa-25 to CGa-88b FOR YOUR SAFETY READ BEFORE LIGHTING LIGHTING INSTRUCTIONS FOR YOUR SAFETY READ BEFORE LIGHTING LIGHTING INSTRUCTIONS Lighting instructions CGa-25 to CGa-88b Natural gas Standing pilot Gas valve manufacturer Robertshaw Gas valve model(s) 7200 Figure 24 Ignition control module sequence of operation status light indications Operation Figure 25b Ladder wiring diagram Spark-ignited pilot system MV FLAME LIMIT DAMPER Legend for ladder wiring diagram Page Operating instructions CGa-25 to CGa-69b Natural gas Spark pilot Gas valve manufacturer Robertshaw Gas valve model(s) 7200 Page Page 44 Service and maintenance Table 6 Service and maintenance schedules (service technician and user) ANNNUAL START-UP Service technician Owner maintenance Service & maintenance annual start-up10b Reported problems Boiler area Air openings Flue gas vent system Service & maint. annual start-up continued10b Oiled-bearing circulators Boiler heating surfaces Burners and base Gas piping Service & maint. annual start-up continued10b Before troubleshooting: Troubleshooting procedure11a Page Chart 1 Standing pilot Boiler will not fire Troubleshooting standing pilot boilers11b Control indicator lights non-lockout modes Troubleshooting the control module Control indicator lights lockout modes Part Number 550-110-593/1099 53 Figure 30 Control module connections DAMPER LIMIT TSTAT CIRC Indicator lights Chart 2 Spark-ignited pilot Troubleshooting POWER light status Is POWER light... Chart 3 Spark-ignited pilot TSTAT CIRC & POWER lights flashing Did you find a voltage across the two external thermostat circuit wires? and Do the lights still flash? Chart 4 Spark-ignited pilot DAMPERlight flashing Chart 5 Spark-ignited pilot FLAME & POWER lights flashing Is pilot burning? Do Are lights flashing? Is gas present at gas valve inlet and within above range? Figure 30, item 8, page 53 Does light flash now? Is 24 VAC present there? Is gas present at gas valve inlet and within above range? Chart 7 Spark-ignited pilot Insufficient heat or no heat (POWERlight on steady) Is thermostat circuit closed (continuity across wires)? Is vent or combustion air piping free of blockage? Are limit switch contacts closed? Figure 30, Item 7, page 53 Replacement parts12a Page Page Page Page Page 66 Dimensions13a Figure 36 Dimensional drawing ALL DIMENSIONS IN INCHES Ratings13b 1 Table 7 Ignition system model suffixes Notes DOE