Empire Comfort Systems VFD26F3-1 Manuale Utente

Page 20

23466-0-0407

Figures 15 and 18 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 16 and 19 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.
(A)VFD26F(M,P)3 PILOT

Correct Pilot Flame Pattern

Figure 15

Incorrect Pilot Flame Pattern

Figure 16

If pilot ﬂame pattern is incorrect, as shown in Figure 15

• See Troubleshooting, page 25.

Cleaning and Maintenance/Pilot

Oxygen Depletion Sensor Pilot

When the pilot has a large yellow tip ﬂame, clean the Oxygen

Depletion Sensor as follows:
1. Clean the ODS pilot by loosening nut B from the pilot tubing.

When this procedure is required, grasp nut A with an open end

wrench.

2. Blow air pressure through the holes indicated by the arrows.

This will blow out foreign materials such as dust, lint and spider

webs. Tighten nut B also by grasping nut A.

Warning:

Never use needles, wires, or similar cylindrical objects to

clean the pilot to avoid damaging the calibrated ruby that

controls the gas ﬂow.

Figure 17

(A)VFD26F(M,P)2 PILOT

Correct Pilot Flame Pattern

Figure 18

Incorrect Pilot Flame Pattern

Figure 19

If pilot ﬂame pattern is incorrect, as shown in Figure 19

• See Troubleshooting, page 25.

PILOT FLAME CHARACTERISTICS