FIGURE 18 - Location of Controls

 

 

 

Flame Sensor

 

Venter Motor (Size 30-75

Flame Rollout Switch

Pressure Switch

High Temperature

illustrated. Venter motor

(Sizes 30-125)

- Sizes 30-125

Limit Control

is in the same location for

 

 

 

all models, but appear-

 

 

 

ance is different.)

 

 

 

Model UDAS has a

 

 

 

collar for combustion

 

 

 

air pipe (not illustrated)

Burner Assembly

Gas Valve

Interlock Door

Switch - UDAS only

Fan

Motor

Terminal

Board (24V)

Disconnect Switch - UDAS only

 

 

 

 

Electrical Box - UDAS only

Ignitor

 

 

Transformer

Remove cover to connect

 

 

supply and access

 

 

Control Panel Assy

 

disconnect switch wires .

Transformer

 

Always replace cover.

located on the

 

 

Pressure Switch

 

 

 

 

 

Control Compartment

 

 

 

Bottom

 

(Sizes 150-400)

 

 

Sizes 30-125

 

Venter Motor

 

 

Sizes 150-400

 

 

 

 

Capacitor

 

 

 

 

Circuit Board

Optional

Circuit Board

Fan Motor

(DSI Integrated

(DSI Integrated

Control Module)

Fan Motor

Control Module)

Capacitor

 

Capacitor

 

 

29.Ignition System

DSI Integrated Control Module (circuit board) - See FIGURE 19. The module monitors the operation of the heater including ignition. The only replaceable com- ponent is the 3 amp Type ATC or ATO fuse. If the fuse is blown, the problem is most likely an external overload. Correct the problem and replace the fuse.

Do not attempt to disassemble the control module. However, each heating season check the lead wires for insulation deterioration and good connections.

Proper operation of the direct spark ignition system requires a minimum flame signal of 1.0 microamps as measured by a microampmeter.

For further information and check out procedure on the direct spark ignition sys- tem, refer to Paragraph 20 and the Troubleshooting Flow Chart in Paragraph 40.

FIGURE 19 - DSI

Integrated Control Module

(Circuit Board)

Only replaceable part is a Type ATC or ATO 3 amp fuse (Color Code Violet), P/N 201685

Form RZ-NA I-UDA, Mfg #195673 Rev 5, Page 31

Page 31
Image 31
Thomas & Betts UDAP, UDAS dimensions Dsi

UDAP, UDAS specifications

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