Desa VF-18P-MHd Water Heater User Manual


 
www.desatech.com
116986-01B18
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1. Disconnect ignitor cable from receiver and
connect to Piezo Ignitor Tab (see Figure 18,
page 17 and Wiring Diagram on page 24).
2. STOP! Read safety information on page 15,
3. Make sure equipment shutoff valve is fully
open.
4. Turn Motor-knob clockwise to the
OFF position.
5. Wait (5) minutes to clear any gas and
then smell for gas around heater and near
oor. If you smell gas, STOP! follow "B"
on page 14.
6. ON/OFF switch in "—" ON position.
7. MAN-knob on valve is in MAN position (see
Figure 18, page 17), When in MAN position
you can see a metallic core.
8. Push and hold down metal core fully with
a pen while the pilot gas ows.
9. Press and release piezo ignitor button until
pilot lights.
10. Continue holding down metal core for
about 10 seconds and then release the metal
core. Pilot should stay lit. If not, repeat steps
one through 4, page 17.
11. Turn MAN-Knob to ON position - main gas
ows.
12. Turn Motor-knob to adjust ame. Knob has
a slipping clutch that allows manual ame
height adjustment.
TO TURN GAS OFF
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
Press OFF button on remote control to switch
off main gas and pilot gas or manually turn
Motor-Knob clockwise to the "O" OFF
position.

Press to decrease the ame height and shut off
main burner.
INSPECTING BURNERS
Check pilot ame pattern and burner ame pat-
terns often.

Figure 20 shows a correct pilot ame pattern.
Figure 21 shows an incorrect pilot ame pattern.
The incorrect pilot flame is not touching the
thermocouple. When the thermocouple cools, the
heater will shut down.
If pilot ame pattern is incorrect, as shown in
Figure 21
turn heater off (see To Turn Off Gas to Appli-
ance, above or page 17)
see Troubleshooting, page 20
Note: The pilot ame on natural gas units will
have a slight curve, but ame should be blue and
have no yellow or orange color.
OPERATING HEATER
Continued
Thermocouple
Thermocouple
Figure 21 - Incorrect Pilot Flame Pattern
(Natural Gas Pilot Shown)
Figure 20 - Correct Pilot Flame Pattern
(Natural Gas Pilot Shown)