Enerco ERXL-125, ERXL-175L, ERXL-60, ERXL-80 Section Operation & Maintenance, Sequence of Operation

Section 7

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.

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.

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. Is the thermostat calling for heat? Is there
Fails to Run:	115V at the burner receptacle?
	2. Check blower side door for seal. Check door
	switch. Replace if necessary/
	3. Check blower for obstructions. Replace
	blower if necessary.
Igniter	1. Check igniter for damage. Replace if
Does Not Glow:	necessary.
	2. Check voltage and resistance at igniter.
	(Voltage should be 115V. Resistance should be
	40-75 ohms.)
	3. Check for obstructions to the air inlet and
	outlet.
	4. Check wiring and hose connections to the
	air switch. Replace if necessary.
	5. Check 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. Check to see if manual valve knob on heater
	gas control in ON.
	3. Supply gas pressure can be checked at
	1/8” NPT pressure tapping on heater external
	manual valve.
	4. Check 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. Check to see if gas lines were properly
Light:	purged of air.
	2. Check inlet and outlet gas pressure during
	ignition period.
	Natural inlet pressure should be 4.6”

Enerco enerRadiant® XL Series Heater 21 Operating Instructions and Owner’s Manual