Weil-McLain PFG-6, EGH-95, EGH-85 manual Chart 2 Boiler will not fire water boilers with tankless

Page 15

Control Supplement — Standing Pilot Boilers

Troubleshooting continued

Chart 2: Boiler will not fire — water boilers with tankless

 

 

 

 

 

 

 

 

 

 

 

 

 

Is damper harness securely plugged in at both ends?

 

 

 

Secure connections.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check for loose wire connections or bad combination

 

 

 

 

 

Is 24VAC present across combination control terminals V2

 

control.

 

 

 

 

 

 

 

& Z?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

rollout thermal fuse element contacts or check for loose

 

 

 

 

 

Is 24VAC present across transformer terminal V2 and

wire connections.

 

 

 

 

 

 

 

yellow wire on vent damper connector?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

If LWCO, spill switch or rollout thermal fuse

 

 

 

 

 

No

 

Yes

 

 

 

 

 

 

 

 

 

element contacts are open, determine cause

 

 

 

 

 

 

 

 

 

 

 

 

 

and correct condition. Failure to do so will

 

 

 

 

 

 

 

 

 

 

 

 

 

cause severe personal injury, death or

 

 

 

 

 

 

Is vent damper rotated open?

 

 

 

substantial property damage.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

Is 24VAC present across gas valve terminals?

rotate open?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

Yes

 

 

 

 

 

No

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace actuator.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Retest.

 

 

 

 

 

 

 

 

 

 

 

Is main flame on now?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Open thermostat contacts for 30 seconds. Vent damper will

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

rotate to closed position. Close thermostat contacts. Vent

 

 

 

 

 

 

 

 

 

 

 

 

 

Retest

damper will rotate to open position. Is 24VAC present

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

across gas valve terminals?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is gas valve cock turned to ON position?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check continuity of each wire in damper harness. Does continuity exist for each wire? See Table below.

No

Yes

 

 

 

Turn gas valve cock to ON position. Retest.

Replace gas valve. Retest

Replace damper wiring harness. Retest.

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

 

 

 

 

Replace gas valve.

 

Replace damper

Retest.

 

actuator. Retest.

 

 

 

Part Number 550-110-031/0605

15

Image 15
Contents EGH-85 & 95 Series Hazard definitions Please read this page firstTable of contents Control installation EGH-85 & 95 water boilers Control installation EGH-85 & 95 water boilers Control installation PFG-6 & 7 water boilers Control installation PFG-6 & 7 water boilers Control installation EGH-85 & 95 steam boilers With probe-type low water cutoff Control installation EGH-85 & 95 steam boilers With float-type low water cutoff Checkout procedureLighting instructions Robertshaw 7000ERHC For Your Safety Read Before LightingVerify proper operation after servicing TroubleshootingChart 1 Boiler will not fire water boilers without tankless Chart 2 Boiler will not fire water boilers with tankless Parts

EGH-85, EGH-95, PFG-6 specifications

Weil-McLain is a recognized leader in the manufacturing of high-efficiency commercial boilers, and among its notable offerings are the PFG-6, EGH-95, and EGH-85 models. Each of these units exemplifies advanced engineering, robust performance, and energy efficiency, addressing diverse heating needs across commercial and residential applications.

The Weil-McLain PFG-6 is a powerful gas-fired boiler designed specifically for commercial applications. It features a 1,250,000 BTU input, making it suitable for larger buildings with substantial heating demands. The PFG-6 uses a heavy-duty heat exchanger for improved heat transfer and durability, ensuring dependable operation even under high-load conditions. This model is equipped with advanced controls that provide precise temperature management and system diagnostics, promoting optimal performance and energy efficiency.

The EGH-95 and EGH-85 models represent Weil-McLain's commitment to high-efficiency heating solutions. These units utilize condensing technology, recovering latent heat from flue gases to achieve efficiency ratings of up to 95% AFUE (Annual Fuel Utilization Efficiency). This high-efficiency aspect translates into substantial energy savings and reduced carbon emissions, making them an environmentally friendly choice for heating systems.

Both the EGH-95 and EGH-85 feature durable cast iron heat exchangers that not only enhance performance but also provide exceptional resistance to corrosion and wear. The EGH series also incorporates a unique multi-stage burner design, which optimizes fuel usage, reduces operational noise, and increases overall system reliability. Their compact design allows for easy installation in confined spaces, making them a versatile option for various construction layouts.

Another key characteristic shared by these models is their user-friendly control systems. With touch-screen interfaces and advanced boiler management systems, users can easily monitor performance, make adjustments, and conduct maintenance checks. This ease of use helps extend the lifespan of the equipment while ensuring efficient operation.

Overall, the Weil-McLain PFG-6, EGH-95, and EGH-85 models highlight the company's dedication to producing high-quality, efficient heating solutions tailored to meet the evolving demands of today’s building environments. Their cutting-edge technology, efficient design, and reliable performance establish Weil-McLain as a top choice for those seeking dependable heating solutions.