Operating instructions

18
Dayton Operating Instructions and Parts Manual
Dayton
®
Propane Gas Convection
Construction Heater
6BY71, 6BY73 and 6BY74
Troubleshooting Chart
Never attempt to service heater while it is connected to
propane supply, operating or hot. Severe burns can occur.
Symptom
Burner fails to light
25/80,000 Btu/Hr Models:
Burner lights but goes out
when automatic control valve
button is released
200,000 Btu/Hr Models:
Pilot lights but goes out when
automatic control valve button
is released
Burn rate is low
Possible Cause
1. Propane supply valve closed
on propane tank(s)
2. Excess flow check valve
closed
3. Blockage in burner orifice
4. Blockage in burner/valve
assembly
5. Piezo ignition system not
sparking
6. Pilot orifice clogged
(200,000 Btu models only)
1. Not enough warm up time
2. Low gas pressure
3. Thermocouple loose or
needs to be replaced
4. Automatic control valve
needs to be replaced
1. Control valve is on LOW
(80/200,000 Btu models
only)
2. Plugged gas orifice
3. Low gas pressure
4. Low fuel supply
Corrective Action
1. Open propane supply valve
slowly
2. Close propane supply valve
on propane tank and reopen
slowly
3. Replace burner orifice
4. Replace burner/valve assembly
5. Check to assure ignitor
electrode gap is 0.120" (5
mm) for 25,000 Btu heaters
and 0.195" (3.04 mm) for
80/200,000 Btu heaters.
Check wire lead for damage.
Replace piezo ignitor and/or
ignitor electrode as necessary
6. Clean or replace pilot assembly
1. Relight, hold automatic control
valve button in 45 seconds
2. Check propane tank(s) for
proper gas supply
3. Tighten connection or
replace thermocouple
4. Replace automatic control
valve
1. Turn valve counter clockwise
to HIGH
2. Replace burner assembly for
25,000 Btu models. Replace
gas orifice for 80/200,000
Btu models
3. Check gas supply; check
regulator output
4. Consult propane gas supplier