Thomas & Betts UDAP, UDAS dimensions High Altitude Operation, Clearances, Pressure Switch

Page 7

7.High Altitude Operation

Gas valve adjustment for high altitude can only be done after heater is operating; see Paragraph 12.

If the heater is being installed at an elevation above 2000 ft (610M), the input rate will have to be derated. This is done by adjusting the valve outlet pressure.

In addition, if the heater is being installed at an altitude above 6000 ft (1830M), the pressure switch will have to be changed. If ordered with the unit as Option DJ20 or DJ21, the pressure switch is shipped separately.

Adjusting the valve outlet pressure is done after the heater is in operation; follow the instructions in Paragraph 12. Capacities and inputs for derated units are also listed in Paragraph 12.

If the pressure switch needs to be changed, do that before the heater is operated; follow the instructions in FIGURE 4.

FIGURE 4 - Installing High Altitude Pressure Switch required above 6000 ft (1830M) elevation

Model UDAP

Size

30

45

 

60

75

100

125

 

150

175

200

225

250

300

350

400

High Altitude Switch P/N

197031

 

 

197032

197031

 

 

201160

 

201161

Negative Pressure OFF Setpoint "w.c.

0.35

 

 

0.45

 

 

0.35

 

 

1.00

 

1.30

Label color

Purple

 

 

Pink

 

Purple

 

 

Brown

 

White

Model UDAP-CV with Option AV6 for Common Venting

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Size

30

45

 

60

75

100

 

 

 

 

 

 

 

 

 

 

 

High Altitude Switch P/N

197029

197032

 

196362

196388

 

 

 

 

 

 

 

 

 

 

 

Negative Pressure OFF Setpoint "w.c.

0.60

0.45

 

0.55

0.50

 

 

 

 

 

 

 

 

 

 

 

Label color

Lt Blue

Pink

 

White

Orange

 

 

 

 

 

 

 

 

 

 

 

Model UDAS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Size

30

45

 

60

75

100

125

 

150

175

200

225

250

300

350

400

High Altitude Switch P/N

 

197029

 

 

 

196388

197030

 

197031

 

201160

 

201161

Differential Pressure OFF Setpoint "w.c.

 

0.60

 

 

 

0.50

0.40

 

0.35

 

1.00

 

1.30

Label color

 

Lt. Blue

 

 

Orange

 

Green

 

Purple

 

Brown

 

White

Instructions for Changing Pressure Switch

1.

In the control compartment, locate the pressure switch.

 

Sizes 30-125 - On the back wall of the control compartment.

 

Sizes 150-400 - On the bracket on the bottom of the control compartment.

2.

Mark and disconnect the two wires attached to the pressure switch.

3.

Disconnect the sensing tube from the pressure switch.

4.

Locate the two screws holding the switch mounting bracket. Remove the

Pressure Switch

screws (save screws) and the pressure switch.

5.

Using the same screws, install the high altitude pressure switch. Attach the

 

sensing tube and wires.

8. Clearances

Units must be installed so that the clearances in the table are provided for combus- tion air space, inspection and service, and for proper spacing from combustible construction. Clearance to combustibles is defined as the minimum distance from the heater to a surface or object that is necessary to ensure that a surface tempera- ture of 90°F above the surrounding ambient temperature is not exceeded.

Clearances

Size

Top

Flue Connector

Access Panel

Non-Access Side

Bottom*

Rear

inches

mm

inches

mm

inches

mm

inches

mm

inches

mm

inches

mm

 

30-125

1

25

6

152

18

457

1

25

1

25

18

457

 

 

 

 

 

 

 

 

 

 

 

 

 

150-400

4

102

6

152

18

457

2

51

1

25

18

457

 

 

 

 

 

 

 

 

 

 

 

 

 

*Suspend the heater so that the bottom is a minimum of 5 feet (1.5M) above the floor.

Form RZ-NA I-UDA, Mfg #195673 Rev 5, Page 7

Page 6 Page 8
Image 7
Page 6 Page 8
Contents Series Fan-Type Unit Heaters Table of ContentsVenting Manual by Model Installation CodesGeneral Hazard Levels of Warnings in this ManualMassachusetts Requirement Warranty Uncrating and PreparationSize DimensionsModel Udas Separated Combustion Fan Size 100 125 Technical DataClearances Instructions for Changing Pressure SwitchPressure Switch High Altitude OperationModel Udap and Model UDAP-CV Combustion Air applies to Model Udap and ModelHeater Throw Unit Heater LocationLocation Recommendations Model Udas Size 100 125 150 175 225 250 300 350 400 Unit Heater Location cont’dHanging the Heater Model Udap Size 100 125 150 175 225 250 300 350 400Locked to Connectors areRecommended maximum hanger rod length is 6 feet 1.8M Be sure Threaded swivelSizing Gas Supply Line Gas Piping and PressuresGas Connection Size Instructions Two -Stage Valve Manifold Pressure Settings by Altitude for CanadaGas Piping and Pressures cont’d Instructions for High Altitude DerateFeet Meters High Altitude Capacity ChangesThermostat and Connections Burner Electrical Supply and ConnectionsCombustion Air Proving Switch Pressure Switch Combustion Air Proving Pressure Switch SettingsLimit Control StatusLED Lights Door Switch Model Udas only Ignition SystemDip Switch Normal Heat Cycle Operating SequenceSW1 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 MaintenanceBurner Orifice Burner Maintenance cont’dInspect and Clean the Burner Re-Install the Burner Instructions to Re-Install the Burner Refer to FigureDSI Fan Blades IgnitionSystem Cont’dUdas only Combustion Air Pressure SwitchDoor Switch Operating Gas ValveDisconnect Flame Rollout Switch Sizes 30-125 onlySwitch Air System TroubleshootingBurner will General TroubleshootingVenter motor Will not startCont’d Troubleshooting cont’d

UDAP, UDAS specifications

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