Weil-McLain UO-4 CV, UO-5 CV Start up burner/set combustion, Hot Gas Puff-Back Heavy Smoke Hazard

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Wire burner

NOTICE

Some Thermostats Are Polar-

ity Sensitive. Reversed polarity

 

could cause erratic cycling of the burner control.

yConnect the wire from the RH or R terminal on the thermostat to the TR terminal on the control.

yConnect the wire from the W terminal on the thermostat to the TW terminal on the control.

○Make connections to the control’s terminals as shown in Figures 11a and 11b. Refer to the label on the un- derside of the control for wiring details.

○Note: Motor-off delay on a 7505P will be disabled if the safety and operating limits as shown in Figures 11a and 11b interrupt power to the control terminal L1.

○Connect thermostat leads to the TR and TW terminals on the control or jumper the TR and TW terminals on the control, as directed by the appliance wiring diagram.

▪Thermostat anticipator Current: 0.1 amp

▪Thermostat voltage: 24 volts AC

Note that if the thermostat short cycles or operates improperly, it may require an isolation relay for proper operation. The Beckett A/C Ready Kit (part no. 51950U) provides this function. Wiring instructions are included with the A/C Ready Kit.

Start up burner/set combustion

Hot Gas Puff-Back and

Heavy Smoke Hazard

Failure to prime the pump properly could result in unstable combustion, hot gas puff-back and heavy smoke.

yDo not allow oil to spray into a hot combustion chamber while bleeding air from the pump.

yInstall a gauge in the nozzle discharge port tubing or fully open the pump bleed valve to prevent oil spray from accumulating in the com- bustion chamber during the air bleed procedure.

yEnsure that all bubbles and froth are purged from the oil supply system before tightening the pump bleed valve.

yEnsure that the appliance is free of oil and oil vapor before starting or resetting the burner.

1.Open the shutoff valves in the oil supply line to the burner.

2.Close air band and partially open air shutter. This is an initial air setting for the pump bleeding pro- cedure only. Additional adjustments must be made with instruments.

3.Set the thermostat substantially above room tem- perature.

4.Close the line voltage switch to start the burner. If the burner does not start immediately you may have to reset the burner primary control.

5.Initiate a call for heat.

6.After the burner starts, press and hold the reset button for 15 seconds until the yellow light turns on. This indicates that the button has been held long enough.

7.Release the reset button. The yellow light will turn off and the burner will start up again.

8.At burner start up, click the reset button while the igniter is still on. This will transition the control to a dedicated Pump Prime mode, during which the mo- tor, igniter, and valve are powered for four minutes. The yellow light will be on.

9.Bleed the pump until all froth and bubbles are purged. If desired, terminate the call for heat or hold the reset button for at least one second to exit Pump Prime mode and return to Standby.

10.At the end of 4 minutes, the yellow light will turn off and the control will automatically return to standby mode.

11.If prime is not established during the four minute pump prime mode, return to step 8 to re-enter Pump Prime mode. Repeat steps 8 through 10 until the pump is fully primed and the oil is free of bubbles.

12.Terminate the call for heat, and the control will re- sume normal operation.

▪Cad Cell Resistance Indicator

○During the burner Run state, click the reset button (less than 1 second) to check the cad cell resistance range. The yellow light will flash 1 to 4 times, de- pending on the amount of light detected by the cad cell. See chart below:

Yellow Light Flashes

Flame Detection Range

 

 

1

Normal (0 - 400 ohms)

2

Normal (400

- 800 ohms)

3

Normal (800

- 1600 ohms)

 

 

 

4Limited (1600 ohms - Lockout)

▪Resetting From Restricted or Hard Lockout

○If the control continues to lockout without a satisfied call for heat, or fails the motor relay check, the control enters Hard (restricted) Lockout in order to limit accu- mulation of unburned oil in the combustion chamber.

○To reset, hold the button down for 15 seconds until the red light turns off and the yellow light turns on.

○Always verify the control functions according to all specifications before leaving the installation site.

○Replace the control if it does not operate as speci- fied.

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6104BAFG R0

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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 Information To Be Used Only By Qualif ed Service Technicians Table of ContentsIndicates a hazardous situ FeatureHazard Definitions General InformationBurner Specif cations General Information To the OwnerWeekly Air Tube Combination ATC codes General SpecificationsInspect Chimney or Direct Vent System Tion Hazard Inspect/Prepare Installation SiteNozzle Chamber DimensionsClearances to burner and appliance Combustion chamber Burner retrof t- tingInspect/Prepare Installation Site Prepare the Burner Mount burner on appliance Prepare the BurnerBurner Dimensions Check/Adjust ‘Z’ Dimension ‘F’ headsCheck/Adjust ‘Z’ Dimension L1 & L2 Heads Fuel Line Valves and Filter Installing the Oil Tank and Supply SystemFrozen Plumbing Water Damage Hazard Wire burnerBurner installed at jobsite Special wiring required with covered burnersFire or Explosion Hazard WiringFeatures Burner Controls GeniSys Model 7505 ControlBurner Controls Light Color On Continuously Flashing Reset Button OperationControl System Features Typical Burner WiringHot Gas Puff-Back Heavy Smoke Hazard Cad Cell Resistance IndicatorResetting From Restricted or Hard Lockout Start up burner/set combustionSet combustion with instruments Check Safety FeaturesStartup / Checkout Startup/CheckoutShutting the Burner Off Perform regular maintenanceReplace the blower wheel Blower wheel assemblyPage 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.

Moving to the UO-4 CV model, this boiler builds on the success of the UO-3 with an increased output capacity, making it ideal for larger residential or light commercial spaces. The UO-4 CV incorporates Weil-McLain’s advanced combustion technology, which optimizes fuel use and significantly reduces emissions. This model maintains a compact design while enhancing overall performance through improved heat transfer and reduced standby losses. The UO-4 CV's user-friendly features, including easy-to-use controls and a diagnostic system, streamline operational efficiency.

The UO-5 CV further solidifies Weil-McLain's commitment to excellence with its highest output among the three. This boiler is particularly suited for extensive heating demands, making it popular among larger commercial installations. The UO-5 CV also employs cutting-edge technology, including advanced controls for precise temperature regulation and an efficient system designed to minimize energy consumption. Its robust construction ensures it can handle heavy use while remaining reliable, even in challenging environments.

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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