Desa VF-24N-MHD - Manual (Page 18)

www.desatech.com 116986-01B 18
Lighting with Piezo Ignitor
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
floor. 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 flows.
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
flows.
12. Turn Motor-knob to adjust flame. Knob has
a slipping clutch that allows manual flame
height adjustment.
TO TURN GAS OFF
TO APPLIANCE
Shutting Off Heater
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.
Shutting Off Burner Only (pilot stays lit)
Press to decrease the flame height and shut off
main burner.
INsPeCTING BURNeRs
Check pilot flame pattern and burner flame pat-
terns often.
PILOT FLAME PATTERN
Figure 20 shows a correct pilot flame pattern.
Figure 21 shows an incorrect pilot flame pattern.
The incorrect pilot flame is not touching the
thermocouple. When the thermocouple cools, the
heater will shut down.
If pilot flame 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 flame on natural gas units will
have a slight curve, but flame 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)