Design Dynamics VTD-18N-PDG installation manual ODS/pilot lights but flame goes

Models: VTD-18N-PDG

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troubleshooting

Continued

OBSERVED PROBLEM

POSSIBLE CAUSE

REMEDY

ODS/pilot lights but flame goes

1. Control knob not fully pressed in

1.

Press in control knob fully

out when control knob is re-

2. Control knob not pressed in

2.

After ODS/pilot lights, keep

leased

 

long enough

 

control knob pressed in 30

 

3.

Safety interlock system has

3.

seconds

 

Wait one minute for safety in-

 

 

been triggered

 

terlock system to reset. Repeat

 

4.

Equipment shutoff valve not

4.

ignition operation

 

Fully open equipment shutoff

 

5.

fully open

5.

valve

 

Pilot flame not touching ther-

A) Contact local natural or

 

 

mocouple, which allows ther-

 

propane/LP gas company

 

 

mocouple to cool, causing

 

B) Clean ODS/pilot (see

 

 

pilot flame to go out. This

 

 

 

problem could be caused by

 

Cleaning and Maintenance,

 

 

one or both of the following:

 

page 14) or replace ODS/pilot

 

 

A) Low gas pressure

 

assembly

 

 

B) Dirty or partially clogged

 

 

 

6.

ODS/pilot

6.

Hand tighten until snug, then

 

Thermocouple connection

 

7.

loose at control valve

7.

tighten 1/4 turn more

 

Thermocouple damaged

Replace pilot assembly

 

8.

Control valve damaged

8.

Replace control valve

 

 

 

 

Burner does not light after ODS/

1. Inlet gas pressure is too low

1.

Contact local natural or pro-

pilot is lit

2.

Burner orifice clogged

2.

pane/LP gas company

 

Clean burner (see Cleaning

 

 

 

 

and Maintenance, page 14)

 

3.

Remote selector in OFF

3.

or replace burner orifice

 

Put remote selector in ON

 

4.

position

4.

position

 

Wire disconnected from gas

See Wiring Diagram, page 14

 

 

control

 

 

 

 

 

 

Delayed ignition of burner

1. Manifold pressure is too low

1.

Contact local natural or pro-

 

2.

Burner orifice clogged

2.

pane/LP gas company

 

Clean burner (see Cleaning

 

 

 

 

and Maintenance, page 14)

 

 

 

 

or replace burner orifice

 

 

 

 

Burner backfiring during com-

1. Burner orifice is clogged or

1.

Clean burner (see Cleaning

bustion

 

damaged

 

and Maintenance, page 14)

 

2.

Damaged burner

2.

or replace burner orifice

 

Replace damaged burner

 

3.

Gas regulator defective

3.

Replace gas regulator

16

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Design Dynamics VTD-18N-PDG installation manual ODS/pilot lights but flame goes