Thomas & Betts UDAP, UDAS dimensions Instructions

Page 13

FIGURE 10 - Gas connection is at the pipe nipple that extends outside the cabinet

Illustration shows both a vertical and horizontal gas supply; requirements are the same.

Valve Outlet or

Orifice Pressure

Setting

NOTE: Gas Conversion Kits are available for changing from propane gas to natural gas or natural gas to propane gas. A factory- authorized conversion kit MUST be used.

Check Valve Outlet Pressure (can only be done after heater is operating)

NOTE: If operating at high altitude, outlet pressure requires adjustment. Follow instructions on page 14.

Leak-test all connections by brushing on a leak-detecting solution.

Ground

 

 

Joint Union

Manual shutoff

To Gas Valve

 

 

(inside the

 

 

cabinet)

 

 

Drip

 

From Gas Supply

Leg

 

(horizontal or vertical)

Pipe nipple extending

 

 

outside the cabinet.

 

Manual shutoff

 

 

To Gas Valve

 

 

(inside the

 

 

cabinet)

 

 

 

Ground

Drip

 

Joint

Leg

 

Union

 

Measuring valve outlet gas pressure cannot be done until the heater is in opera- tion. It is included in the steps of the "Check-Test-Start" procedure in Paragraph 24. The following warnings and instructions apply.

WARNING: Valve outlet gas pressure must never exceed 3.5" w.c. for natural gas and 10" w.c. for propane gas.

For Natural Gas: When the heater leaves the factory, the combination gas valve is set so that the valve outlet gas pressure for a single stage valve or high fire of a two stage valve is regulated to 3.5" w.c. Inlet supply pressure to the valve for natural gas must be a minimum of 5" w.c. or as noted on the rating plate and a maximum of 14" w.c.

For Propane Gas: When the heater leaves the factory, the combination gas valve is set so that the valve outlet gas pressure for a single stage valve or high fire of a two stage valve is regulated to 10" w.c. Inlet supply pressure to the valve for propane gas must be a minimum of 11" w.c. and a maximum of 14" w.c.

Before attempting to measure or adjust valve outlet gas pressure, the inlet supply pressure must be within the specified range both when the heater is in operation and on standby. Incorrect inlet pressure could cause excessive valve outlet gas pressure immediately or at some future time. If natural gas supply pressure is too high, install a regulator in the supply line before it reaches the heater. If natural gas supply pressure is too low, contact your gas supplier.

Instructions

1)Locate the 1/8” output pressure tap on the valve (See FIGURE 11, page 14). With the manual valve turned off to prevent flow to the gas valve, connect a manometer to the 1/8" pipe outlet pressure tap in the valve. NOTE: A manom- eter (fluid-filled gauge) is recommended rather than a spring type gauge due to the difficulty of maintaining calibration of a spring type gauge.

2)Open the manual valve and operate the heater. (NOTE: On Model UDAS, depress and hold the door safety switch.) Measure the outlet pressure of the gas valve. Normally when operating at sea level, adjustments should not be neces- sary to the factory setting. (For high altitude settings, see next paragraph.)

If adjustment is necessary, remove the cap from the adjustment screw(s). Set pressure to correct settings by turning the regulator screw IN (clockwise) to increase pressure. Turn regulator screw OUT (counterclockwise) to decrease pressure.

Form RZ-NA I-UDA, Mfg #195673 Rev 5, Page 13

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Contents Series Fan-Type Unit Heaters Table of ContentsGeneral Installation CodesHazard Levels of Warnings in this Manual Venting Manual by ModelMassachusetts Requirement Warranty Uncrating and PreparationSize DimensionsModel Udas Separated Combustion Fan Size 100 125 Technical DataPressure Switch Instructions for Changing Pressure SwitchHigh Altitude Operation ClearancesModel Udap and Model UDAP-CV Combustion Air applies to Model Udap and ModelHeater Throw Unit Heater LocationLocation Recommendations Hanging the Heater Unit Heater Location cont’dModel Udap Size 100 125 150 175 225 250 300 350 400 Model Udas Size 100 125 150 175 225 250 300 350 400Recommended maximum hanger rod length is 6 feet 1.8M Connectors areBe sure Threaded swivel Locked toSizing Gas Supply Line Gas Piping and PressuresGas Connection Size Instructions Gas Piping and Pressures cont’d Manifold Pressure Settings by Altitude for CanadaInstructions for High Altitude Derate Two -Stage ValveFeet Meters High Altitude Capacity ChangesThermostat and Connections Burner Electrical Supply and ConnectionsCombustion Air Proving Switch Pressure Switch Combustion Air Proving Pressure Switch SettingsLimit Control Dip Switch Door Switch Model Udas only Ignition SystemNormal Heat Cycle Operating Sequence StatusLED LightsSW1 SW2 Time Ignition System cont’dContinuous Fan Operation Fault Modes Gas Valve Fan Motor Fault Modes cont’d LockoutOperating Sequence Wiring DiagramsWiring Diagrams cont’d SW1 Check the installation prior to startup Heater Startup Check Installation and StartupOperating Instructions Operating Sequence Vent System Testing Procedure Model Udap Check installation after startupStartup cont’d Maintenance ScheduleUse only factory-authorized parts Burner Removal Instructions Refer to Figure Heat Exchanger Maintenance Burner MaintenanceInspect and Clean the Burner Re-Install the Burner Burner Maintenance cont’dInstructions to Re-Install the Burner Refer to Figure Burner OrificeDSI System IgnitionCont’d Fan BladesDoor Switch Combustion Air Pressure SwitchOperating Gas Valve Udas onlySwitch Flame Rollout Switch Sizes 30-125 onlyAir System Troubleshooting DisconnectVenter motor General TroubleshootingWill not start Burner willCont’d Troubleshooting cont’d

UDAP, UDAS specifications

Thomas & Betts is a well-respected name in the electrical and industrial products sector, known for its innovation and quality. Among its impressive portfolio, the UDAS and UDAP series of connectors stand out for their reliable performance and advanced features. These connectors are specifically designed to meet the rigorous demands of electrical applications in various industries.

The UDAS (Universal Disconnect Appliance Switch) and UDAP (Universal Disconnect Appliance Plug) are engineered for high-capacity applications where safety, efficiency, and ease of use are paramount. One of the main features of these connectors is their ability to deliver increased electrical resistance and durability. They are constructed from high-quality materials that can withstand extreme environmental conditions, making them ideal for outdoor and harsh industrial applications.

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In summary, the Thomas & Betts UDAS and UDAP series stands out for their robust design, quick-connect technology, and versatility across various industrial applications. Their durability and compliance with safety standards make them an excellent choice for professionals seeking reliable connectivity solutions in demanding environments. Investing in these connectors ensures optimal performance and safety in electrical installations, showcasing Thomas & Betts' commitment to excellence in electrical components.
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