27440-1-0510
Page 21
Figures 20 and 21 show a correct pilot flame pattern. The correct
flame will be blue and will extend beyond the thermocouple. The
flame will surround the thermocouple just below the tip. A slight
yellow flame may occur where the pilot flame and main burner flame
meet. Figures 22 and 23 show an incorrect pilot flame pattern. The
incorrect pilot flame is not touching the thermocouple. This will
cause the thermocouple to cool. When the thermocouple cools, the
heater will shut down.
correct Pilot flame Pattern for VfdR
figure 20
correct Pilot flame Pattern for VfdT & VfdM
figure 21
Incorrect Pilot flame Pattern for VfdR
figure 22
Incorrect flame Pattern for VfdT & VfdM
figure 23
If pilot flame pattern is incorrect, as shown in Figures 22 and 23
• See Troubleshooting, page 23.
THERMOPILE
(VFDR ONLY)
PILOT
THERMOCOUPLE
(NATURAL)
THERMOCOUPLE
(LPG)
THERMOPILE
(VFDR ONLY)
PILOT
THERMOCOUPLE
(NATURAL)
THERMOCOUPLE
(LPG)
PILoT fLaMe cHaRacTeRISTIcS