Thomas & Betts UDAS, UDAP Combustion Air Proving, Limit Control, Pressure Switch Settings

Page 18

16.Combustion Air Proving

Switch (cont’d)

Pressure Switch Settings

The two Tables on the left below list the approximate water column negative pres- sure readings and switch setpoints for sea level operating conditions for Model UDAP and Model UDAP-CV heaters. The Table on the right lists the approximate water column differential pressure readings and switch setpoints for sea level op- erating conditions for Model UDAS heaters.

DANGER: Safe operation of this unit requires proper venting flow. NEVER bypass combustion air proving switch or attempt to operate the unit without the venter running and the proper flow in the vent system. Hazardous conditions could result. See Hazard Levels, page 2.

Model

Startup

Equilibrium

Setpoint

Setpoint

Label

Switch

Cold

Hot

OFF

ON

UDAP

Color

P/N

Negative Pressure Measured in " w.c.

 

 

 

30

1.00

0.78

0.40

0.58

Green

197030

45

0.95

0.75

0.40

0.58

Green

197030

60

1.00

0.78

0.50

0.68

Orange

196388

75

1.00

0.85

0.50

0.68

Orange

196388

100

0.85

0.72

0.50

0.68

Orange

196388

125

0.75

0.60

0.40

0.58

Green

197030

150, 175

0.75

0.65

0.40

0.58

Green

197030

200, 225

2.20

1.50

1.10

1.30

Blue

201158

250, 300

2.30

1.60

1.10

1.30

Blue

201158

350, 400

2.60

1.80

1.40

1.60

Red

201159

Model

Startup

Equilibrium

Setpoint

Setpoint

Label

Switch

UDAS

Cold

Hot

OFF

ON

Color

P/N

Differential Pressure Measured in " w.c.

 

 

 

30

1.00

0.78

0.65

0.83

Yellow

197028

45

1.05

0.80

0.65

0.83

Yellow

197028

60

1.10

0.85

0.65

0.83

Yellow

197028

75

1.10

0.85

0.65

0.83

Yellow

197028

100

0.85

0.72

0.55

0.73

White

196362

125

0.75

0.60

0.45

0.63

Pink

197032

150, 175

0.75

0.60

0.40

0.58

Green

197030

200, 225

2.20

1.50

1.10

1.30

Blue

201158

250, 300

2.30

1.60

1.10

1.30

Blue

201158

350, 400

2.60

1.80

1.40

1.60

Red

201159

Model UDAP-CV

Startup

Equilibrium

Setpoint

Setpoint

Label

Switch

Cold

Hot

OFF

ON

with Opt AV6

Color

P/N

Negative Pressure Measured in " w.c.

 

 

 

30

1.10

0.84

0.65

0.83

Yellow

197028

45

1.10

0.81

0.50

0.68

Orange

196388

60

0.92

0.75

0.60

0.78

Lt Blue

197029

75

0.97

0.78

0.60

0.78

Lt Blue

197029

100

0.88

0.71

0.55

0.73

White

196362

17. Limit Control

All units are equipped with a temperature activated auto reset limit control. The

 

control is factory set and is non-adjustable. If the setpoint is reached, the limit

 

control will interrupt the electric supply to the gas valve. This safety device pro-

 

vides protection in the case of motor failure or lack of airflow due to a restriction at

 

the inlet or outlet. (For location, see FIGURE 18, page 31.)

18.Flame Rollout Switch - Sizes 30-125only

CAUTION: The auto reset limit control will continue to shut down the heater until the cause is corrected. Never bypass the limit control; hazardous conditions could result. See Hazard Intensity Levels, page 2.

Sizes 30-125 are equipped with a temperature activated manually reset flame rollout switch. The flame rollout switch is located at the top of the burner assembly. It is factory set and is non-adjustable. If the setpoint is reached, the flame rollout acts to interrupt the electric supply to the gas valve. If the flame rollout switch activates, identify and correct the cause before resetting the switch. Refer to the Mainte- nance Section for information on probable causes and instructions on resetting the flame rollout switch. (For location, see FIGURE 18, page 31.)

DANGER: If the manual reset flame rollout switch activates, identify and correct the cause before resetting the switch. Never bypass the flame rollout switch; hazardous conditions could result. See Hazard Intensity Levels, page 2.

Form RZ-NA I-UDA, P/N 195673 Rev 5, Page 18

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Contents Table of Contents Series Fan-Type Unit HeatersHazard Levels of Warnings in this Manual Installation CodesGeneral Venting Manual by ModelWarranty Uncrating and Preparation Massachusetts RequirementDimensions SizeModel Udas Separated Combustion Fan Technical Data Size 100 125High Altitude Operation Instructions for Changing Pressure SwitchPressure Switch ClearancesCombustion Air applies to Model Udap and Model Model Udap and Model UDAP-CVUnit Heater Location Heater ThrowLocation Recommendations Model Udap Size 100 125 150 175 225 250 300 350 400 Unit Heater Location cont’dHanging the Heater Model Udas Size 100 125 150 175 225 250 300 350 400Be sure Threaded swivel Connectors areRecommended maximum hanger rod length is 6 feet 1.8M Locked toGas Piping and Pressures Sizing Gas Supply LineGas Connection Size Instructions Instructions for High Altitude Derate Manifold Pressure Settings by Altitude for CanadaGas Piping and Pressures cont’d Two -Stage ValveHigh Altitude Capacity Changes Feet MetersBurner Electrical Supply and Connections Thermostat and ConnectionsCombustion Air Proving Switch Pressure Switch Pressure Switch Settings Combustion Air ProvingLimit Control Normal Heat Cycle Operating Sequence Door Switch Model Udas only Ignition SystemDip Switch StatusLED LightsIgnition System cont’d SW1 SW2 TimeContinuous Fan Operation Fault Modes Fault Modes cont’d Lockout Gas Valve Fan MotorWiring Diagrams Operating SequenceWiring Diagrams cont’d SW1 Check Installation and Startup Check the installation prior to startup Heater StartupOperating Instructions Operating Sequence Check installation after startup Vent System Testing Procedure Model UdapMaintenance Schedule Startup cont’dUse only factory-authorized parts Heat Exchanger Maintenance Burner Maintenance Burner Removal Instructions Refer to FigureInstructions to Re-Install the Burner Refer to Figure Burner Maintenance cont’dInspect and Clean the Burner Re-Install the Burner Burner OrificeDSI Cont’d IgnitionSystem Fan BladesOperating Gas Valve Combustion Air Pressure SwitchDoor Switch Udas onlyAir System Troubleshooting Flame Rollout Switch Sizes 30-125 onlySwitch DisconnectWill not start General TroubleshootingVenter motor Burner willTroubleshooting cont’d Cont’d

UDAP, UDAS specifications

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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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