Weil-McLain UO-4 CV, UO-5 CV, UO-3 CV manual Burner Controls

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Burner Controls

Typical Burner Sequence of Operation for GeniSys 7505 Control.

Refer to the appliance manufacturer’s wiring diagram for actual specifications.

 

1

9

 

Standby

Pump

 

prime

 

 

2

3

4

Valve-on delay

Trial for

Lockout

ignition

 

 

 

5

 

 

Ignition carryover

 

8

6

7

Motor-off delay

Run

Recycle

1.Standby: The burner is idle, waiting for a call for heat.

2.Valve-On Delay: The igniter and motor are on while the control delays turning on the oil solenoid valve for the programmed time.

3.Trial For Ignition : The oil solenoid valve is energized. A flame should be established within the factory set trial for ignition time (lockout time).

4.Lockout: The control has shut down for one of the following safety reasons:

a.The trial for ignition (lockout) time expired without flame being established.

b.The cad cell detected flame at the end of the Valve On Delay state.

To reset the control from lockout click the button 1- second.

NOTE: A recurrence of the above failure modes or a failed welded relay check could cause the control to enter a Hard Lockout state that must be reset only by a qualified service technician.

To reset from Hard Lockout, hold the reset button for 15 seconds until the yellow light turns on.

5.Ignition Carryover: Once flame is established, the igniter remains on for 10 additional seconds to ensure flame stability.

6.Run: The flame is sustained until the call for heat is satisfied. The burner is then sent to Motor-Off Delay, if applicable, or it is shut down and sent to Standby.

7.Recycle: If the flame is lost while the burner is

firing, the control shuts down the burner, enters a 60 second recycle delay, and repeats the ignition sequence. The control will continue to Recycle each time the flame is lost, until it reaches a pre-set time allotment. The control will then go into Hard Lockout instead of recycle. This feature prevents excessive accumulation of oil in the appliance firing chamber.

8.Motor-Off Delay: If applicable, the oil solenoid valve is turned off and the control delays turning the motor off for the set motor-off delay time before the control returns to standby.

9.Pump Prime: The igniter and motor are on with the oil solenoid valve energized for 4 minutes. During Pump Prime mode, the cad cell is disregarded, allowing the technician to prime the pump without having to jumper the cad cell.

6104BAFG R06

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Contents R02 01/09 Potential for Fire, Smoke and Asphyxiation Hazards To the Professional, Qualif ed Installer or Service AgencyTo the Homeowner or Equipment Owner Table of Contents Information To Be Used Only By Qualif ed Service TechniciansFeature Hazard DefinitionsGeneral Information Indicates a hazardous situBurner Specif cations General Information To the OwnerWeekly General Specifications Air Tube Combination ATC codesInspect/Prepare Installation Site Inspect Chimney or Direct Vent System Tion HazardChamber Dimensions Clearances to burner and applianceCombustion chamber Burner retrof t- ting NozzleInspect/Prepare Installation Site Prepare the Burner Prepare the Burner Mount burner on applianceCheck/Adjust ‘Z’ Dimension ‘F’ heads Burner DimensionsCheck/Adjust ‘Z’ Dimension L1 & L2 Heads Installing the Oil Tank and Supply System Fuel Line Valves and FilterWire burner Burner installed at jobsiteSpecial wiring required with covered burners Frozen Plumbing Water Damage HazardWiring FeaturesBurner Controls GeniSys Model 7505 Control Fire or Explosion HazardBurner Controls Reset Button Operation Light Color On Continuously FlashingTypical Burner Wiring Control System FeaturesCad Cell Resistance Indicator Resetting From Restricted or Hard LockoutStart up burner/set combustion Hot Gas Puff-Back Heavy Smoke HazardCheck Safety Features Startup / CheckoutStartup/Checkout Set combustion with instrumentsPerform regular maintenance Shutting the Burner OffBlower wheel assembly Replace the blower wheelPage Description Warranty

UO-3 CV, UO-4 CV, UO-5 CV specifications

Weil-McLain is a well-respected name in the heating industry, recognized for its high-quality and efficient boiler systems. Among its notable offerings are the UO-3 CV, UO-4 CV, and UO-5 CV models, all of which showcase advanced engineering and innovative technology tailored for residential and commercial applications.

The UO-3 CV boiler is designed for mid-sized heating requirements, boasting a strong output capacity that balances efficiency with performance. It features a compact size, suitable for smaller installations, without sacrificing power. The boiler is equipped with a durable cast iron heat exchanger that provides excellent thermal efficiency and longevity, ensuring reliable operation over the years. Its easy access for maintenance also makes it a popular choice among HVAC professionals.

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In summary, the Weil-McLain UO series, including the UO-3 CV, UO-4 CV, and UO-5 CV, represents a perfect blend of efficiency, innovation, and reliability. All models utilize durable materials, advanced engineering, and state-of-the-art technologies that define Weil-McLain's reputation for quality in hydronic heating solutions. Whether for residential or commercial applications, these boilers serve as dependable sources of heat, catering to various needs while maintaining energy efficiency and lower emissions.
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