Lennox Hearth L20 DVF-2 TROUBLESHOOTING Qualified Technicians Only, Unplug Blower Power Cord

TROUBLESHOOTING Qualified Technicians Only

(MODEL L20 BF-2 ONLY)

SPILL SWITCH

This appliance is equipped with a “Spill Switch” which is a safety device that will shut off gas to the burner in case of sus- tained back draft or flue gas spillage from the draft hood. The purpose of this safety device is to prevent potentially harmful gases from entering your home in the event of a blockage in the vent system. Once the switch has been activated, the burner cannot be relit until the switch is reset manually (see Accessing and Resetting Spill Switch on this page). Repeated tripping of the switch may indicate there is an obstruction in the venting

system. Other possible causes for the spill switch tripping are Fig. 2Reset Button listed below (ordered from most likely to least likely). Note: En-

sure that appliance is cold before performing any checks.

Draft Hood

Spill Switch

Troubleshooting Check List (Qualified Technicians Only)

Flue Blockage - Check venting system for blockage (e.g. bird nest, damage, etc.).

Down draft (Is a high wind termination cap installed?). Examine entire venting system for faults such as discon- nected joints or damaged vent sections.

Check the vent sizing according to specifications, and vent configurations (correct venting system, if necessary). Inadequate make-up air supply in the dwelling, resulting in negative pressure, inhibiting exhaust flow of the appliance. (evaluate and determine ways to increase make-up air, if nec- essary, within the area of the installation).

Defective spill switch (very rare) - Disconnect wires from Spill Switch. Set Multimeter on ohms and do an ohm check between terminals on switch. A “O” ohms reading indicates a good switch. An infinite ohms of “1” reading indicates a defective (or open) switch.

If spillage is suspected, a simple spillage test can be conducted to confirm or out rule a spillage condition (see Spillage Test on this page).

ACCESSING AND RESETTING SPILL SWITCH

1.UNPLUG BLOWER POWER CORD.

2.Using a ¼” nut driver, remove Rear Access Panel (see Fig. 1).

Stove Back

Rear Access

Panel

Remove screws

indicated by arrows

Fig. 1

Spill Switch

Press In This

Red Reset Button

Fig. 3

SPILLAGE TEST PROCEDURE

A flue spillage test is recommended as part of the installation and periodically afterwards.

1.Remove Rear Access Panel, if necessary (Fig. 1).

2.Close all the doors and windows in the room. Turn ON all exhaust fans in the home.

3.Light the appliance. Adjust burner flame to highest setting and operate for approximately 10 minutes before checking for spillage.

4.Use an open flame (preferably a wooden match) or smoke (cigarette, burning rope) to determine if spillage is present. To test for spillage, move the flame or smoke device across the opening at the bottom of the draft hood as shown be- low. If the flame or smoke is drawn into the opening, there is no spillage. If the flame or smoke is blown out or away from the opening, spillage is present and corrective action should be taken before operating the appliance (see bullets under Spill Switch on this page).

Stove Back

Flame drawn

Draft Hoodin, indicates no spillage

Spill Switch

3.	Locate Spill Switch and press the red button in the center of
			Fig. 4
	the switch (press in firmly until button stays depressed). See
	Fig. 2, 3 & 4.	5. Reinstall Rear Access Panel (see Fig. 1).
4.	Perform Spillage Test prior to reinstalling Rear Access Panel
	(see Spillage Test Procedure on this page).

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