Burner mechanism remains on standby until temperature drops, and then restarts the
If there is a flame failure during the period in which the burner is in operation, the air
damper will return to the low fire position, the flame program control will return to prepurge
for approximately 30 seconds After the prepurge, there will be a trial ignition lasting 12
seconds. If the burner does not ignite, the burner shuts off on safety. If there is no flame
detected at this time, the flame program control will go into flame failure safety and can be
restarted only after depressing the red reset button located on Its cover
1. Turn burner switch "OFF"
2. Close manual fuel valves
3. Allow main circulating pump to operate until temperature of the circulating oil has dropped to
2500F as indicated by thermometer on front of heater
4. Push stop button on pump starter
5. Close the return oil valves located on the strainer assembly (Fig 14)
6. Close and secure control panel box door
NOTE Before leaving the heater, make sure there are no flammable materials left open or
spread around the area
14. Operation in Extreme Heat
a. Indoor Ventilation If the hot oil heater is operated Indoors or In an enclosed area, allow sufficient
room around the equipment for air circulation and ventilation of the area.
NOTE Various units in the control box will not function properly above 125F Make provision to keep
control box operating In an ambient temperature of 1 25F or less.
Lubrication. Refer to the current lubrication order and detailed lubrication Instructions (Para 31
& Fig 16).
15. Start-Up of Hot Oil Heater in Cold Weather
When heat transfer oil Is viscous because of low ambient temperature, the thermal overloads on
pump starter will safety out Push reset button on pump starter (Fig 11, Item 7) and remedy as
Reduce pressure on the relief valve (Fig 2, Item 9) as low as possible This will relieve
pumping pressure and return oil to expansion tank (Ref Para. 38).
Make sure that the pressuretrol controller, Para. 50, Is also backed off with adjusting
screws so the electrical circuit is also completed.
Turn on burner switch (Fig. 11, Item 2) and fire heater at intervals of 1-1 /2 minutes until
heat transfer oil has enough heat to lower viscosity and start to circulate through system.