MUA-SVX004B-EN
33
Lighting
IIm
mp
po
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an
ntt:: Purge the gas line of air before attempting to light the pilot in the unit. Wait 5 minutes
for unburned gas to vent. Check for gas leaks.
W
WA
AR
RN
NIIN
NG
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E
Ex
xp
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N
Ne
ev
ve
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an
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de
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ga
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Usse
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g..
The unit is furnished with an intermittent pilot ignition system. A lighting instruction plate is
permanently attached to the unit for the pilot system supplied with the unit. To set the
intermittent pilot ignition system in operation, proceed as follows:
1. Turn on the main manual valve and pilot valve.
2. Turn on electrical power. The unit should now be under the control of the thermostat.
3. Turn the thermostat to the high heat reading to see if the pilot and main burner ignite.
4. Turn the thermostat to the lowest setting to interrupt power to the ignition system to
determine that both the pilot burner and main burner are extinguished.
5. Set the thermostat at the desired setting for normal operation.
For complete shutdown:
1. Turn the main and pilot valves to the OFF position.
2. Shut off electric power.
3. Adjust the thermostat to the lowest setting.
Figure 15.
Main Burner Flames
NORMAL
(HARD FLAME)
YELLOW TIPPING
(MARGINAL)
YELLOW FLAME
(TOO LITTLE AIR)
LIFTING
(TOO MUCH AIR)
N
No
otte
e:: There may be momentary and spasmodic orange flashes in the flame. This is caused by
the burning of airborne dust particles, and not to be confused with the yellow tipping,
which is a stable or permanent situation when there is insufficient primary air.
