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SECTION 8
Operation & Maintenance
Sequence of Operation
1.
Turn the thermostat up. When the thermostat calls for heat,
blower motor will energize.
2.
When the motor approaches nominal running RPM, the air
proving switch closes and activates the ignition module.
3.
Once the igniter sparks, the gas valve is energized.
4.
If a flame is detected, the gas valve remains open. When the
call for heat is satisfied the system control mechanism de-
energizes the burner line voltage supply and the gas valve is
turned off.
5.
If no flame is detected, the gas valve is closed, and a purge
period begins. After the purge, the module acts to power the
igniter for a second trial for ignition period. If flame is still
not established, a third and final purge and trial cycle begins.
After three trials, the module will lockout until reset. Reset
is accomplished by removing power from the module for at
least five (5) seconds (thermostat cycle required.)
Maintenance
For best performance, the following maintenance procedures should
be performed before each heating season:
1.
Be sure gas and electrical supply to heater are off before
performing any service or maintenance.
2.
Check condition of blower scroll and motor. Dirt and dust
may be blown out with compressed air, or a vacuum cleaner
may be used. When using compressed air do not exceed 30
psi in order to not damage fragile hot surface igniter.
3.
Check condition of burner. Carefully remove any dust or
debris from inside the burner box or burner cup.
4.
Inspect the igniter. Replace igniter if there is excessive carbon
residue, erosion, breakage or other defects.
5.
Check the inside of the firing tube with a flashlight. If carbon
or scale are present, scrape out the deposits with a wire
brush or rod, or metal plate attached to a wooden pole.
6.
Check to see that the burner observation window is clean
and free of cracks or holes. Clean or replace as necessary.
7.
Check the vent cap for soot or dirt. After cleaning as
necessary, re-attach the vent cap to the heater.
8.
Outside surfaces of heater may be cleaned by wiping with a
damp cloth.
9.
Check that the first reflector has its retention wire fastened to
the burner box and it is still stable.
10. Check vent terminal and fresh air inlet to see that they have
not been blocked during the non-heating season. If either
pipe is restricted, the air switch won't close, resulting in a no-
heat situation.
A qualified service agency should be contacted for service
other than routine maintenance.
Enerco | Heatstar AG Series Heater
Troubleshooting
CAUTION: Before opening the Heatstar AG burner door for any
type of service, be sure the gas supply has been shut off at
the heater and the electrical cord from the burner box has
been unplugged.
Blower Motor 1. Is the thermostat calling for heat? Is there
Fails to Run:
1 15V at the motor terminals?
2. Check blower side door for seal. Check door
3. Check blower for obstructions. Replace
Igniter Doesn't Spark
2. Check voltage and resistance at igniter.
3. Check for obstructions to the air inlet and
4. Check wiring and hose connections to the
5. Check voltages at transformer primary and
Valve Does Not Gas pressure downstream of gas control can
Come On: be measure by using a manometer and
connecting to pressure tap on control/
1. Check to see if manual valve heater is ON.
2. Check to see if manual valve knob on heater
3. Supply gas pressure can be checked at 1/8"
4. Check to see if gas control is opening: no
If the valve is closed, either the gas valve or the
ignition module is faulty.
WARNING: Do not disconnect ground leads
inside heater. Do not interchange grounded
and ungrounded leads on transformer or
ignition module.
Burner Does Not 1. Check to see if gas lines were properly
Light:
2. Check inlet and outlet gas pressure during
Natural inlet pressure should be 4.6"
Natural outlet pressure should be 3.5"
LP inlet pressure should be 1 1.0"
LP outlet pressure should be 10.25"
3. Check for proper orifice and air plate.
Burner Does Not 1. Check ground wire continuity.
Stay Lit: 2. Check burner internal wiring for reversed
leads.
3. Check insulation on the igniter leads.
4. Replace module if necessary.
E-18
Operating Instructions and Owner's Manual
switch. Replace if necessary.
blower if necessary.
1. Check igniter for damage or excess.
carbon. Replace if necessary.
(Voltage should be 1 15V. Resistance should
be 40-75 ohms.)
outlet.
air switch. Replace if necessary.
secondary. Replace transformer or module if
necessary.
gas control in ON.
NPT pressure tapping on heater external
manual valve.
manifold pressure indicates valve is closed.
purged of air.
ignition period.
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