HeatStar ERXL-40 Instrucciones De Funcionamiento Y Manual Del Propietario página 19

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. The ignition module then energizes the hot surface igniter for
a timed warm-up period (approximately 45 to 60 seconds.)
4. After the warm-up period, the gas valve is energized.
5. During the last part of the sequence, the igniter is de-
energized and is converted to a flame sensing rod.
6. If a flame is detected, the gas valve remains open. When the
call for heat is satisfied, and the system control mechanism
de-energizes the burner line voltage supply, the gas valves are
turned off.
7. If no flame is detected on a single-try module, the gas valve
is closed, and the module will lockout until it is reset. Reset
is accomplished by removing power from the module for at
least five (5) seconds (thermostat cycle required.)
8. If no flame is detected on a three-trial module, the gas
valve is closed, and a purge period begins. After the purge,
the module acts to power the igniter for a second warm-
up period, and a second trial for ignition period. If flame is
still not established, a third and final purge, warm-up, 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.)
9. On a three-trial module, if flame is established and lost
on the first or second trial, the gas valve is turned off, a
purge, warm-up, and trial for ignition will occur on a three-
trial module, only three trials for ignition are allowed per
thermostat cycle.
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 flue pipe for soot or dirt. After cleaning as
necessary, re-attach the flue pipe to the heater.
8. Outside surfaces of heater may be cleaned by wiping with a
damp cloth.
Enerco | Heatstar ERXL Series Heater
9. A qualified service agency should be contacted for service
other than routine maintenance.
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.
Troubleshooting
CAUTION: Before opening the Ener-Radiant XL
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. I s the thermostat calling for heat? Is there
Fails to Run: 1 15V at the burner receptacle?
2. C heck blower side door for seal. Check door
switch. Replace if necessary/
3. C heck blower for obstructions. Replace
blower if necessary.
Igniter 1. C heck igniter for damage. Replace if
Does Not Glow: necessary.
2. C heck voltage and resistance at igniter.
(Voltage should be 1 15V. Resistance should
be 40-75 ohms.)
3. C heck for obstructions to the air inlet and
outlet.
4. C heck wiring and hose connections to the
air switch. Replace if necessary.
5. C heck voltages at transformer primary and
secondary. Replace transformer or module if
necessary.
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. C heck to see if manual valve knob on heater
gas control in ON.
3. S upply gas pressure can be checked at 1/8"
NPT pressure tapping on heater external
manual valve.
4. C heck to see if gas control is opening: no
manifold pressure indicates valve is closed.
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. C heck to see if gas lines were properly
Light: purged of air.
2. C heck inlet and outlet gas pressure during
ignition period.
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.
19 Operating Instructions and Owner's Manual