BASO L62AA User Manual

Installation Instructions

Issue Date January 19, 2015

Part No. BASO-INS-L62AA, Rev. D www.baso.com

L62AA BASO® Safety Shutoff Device

Installation

WARNING: Risk of Fire or Explosion.

Do not use the L62AA in Liquefied Petroleum (LP) gas applications. The L62AA is for use with

natural gas only. Pilot gas is not 100% shut off and will continue to flow with the loss of pilot flame. Use of LP gas may cause gas accumulation and may result in severe personal injury or death.

IMPORTANT: Only qualified personnel should install or service BASO® Gas Products. These instructions are a guide for such personnel. Carefully follow all instructions in this document and all instructions for the appliance.

WARNING: Risk of Explosion or Fire. Shut off the gas supply at the main manual shutoff valve before installing or servicing the L62AA. Failure to shut off the gas supply can result in the release of gas during installation or servicing, which can lead to an explosion or fire, and may result in severe personal injury or death.

CAUTION: Risk of Electric Shock.

Disconnect power supply before making electrical connections to avoid electric shock.

IMPORTANT: Make all gas installations in accordance with applicable local, national, and regional regulations.

IMPORTANT: Do not loosen or tighten the brass hex nut that fastens the brass terminal bushing to the switch housing. The machined flats on the terminal bushing must be parallel to the flats on the switch housing. If not, the switch power unit may distort and cause the safety switch to fail.

To install the L62AA.

1. Turn off power to the appliance.

2. Turn off gas at the main manual shutoff valve adjacent to the appliance.

3. Remove the L62AA cover by loosening the screws at the side of the device (not the brass hex nut).

4. Mount the L62AA in any convenient position using the mounting holes provided. See Figure 1 for mounting hole locations.

5. Push the circuit wires through the conduit opening on the bottom of the L62AA, strip the ends of the wires just enough to put the bare wire under the terminal screws, and attach them to the two wire terminals (see Figure 1).

6. Replace the cover (do not loosen the brass hex nut).

7. Attach the thermocouple securely to the pilot burner, and screw the terminal end to the BASO power unit terminal on the L62AA (see Figure 1 and Figure 2). Make sure that this connection is clean. Tighten the thermocouple lead nut finger tight plus a maximum of 1/8 turn. Do not overtighten.

WARNING: Risk of Explosion or Fire.

Do not attach both wires to one terminal on the L62AA. Doing so bypasses and eliminates all safety features provided by the L62AA, can lead to an explosion or fire, and may result in severe personal injury or death.

WARNING: Risk of Explosion or Fire.

Verify that this device is wired in series electrically with thermostats and other appliance operating controls. Wiring the device in parallel with such controls will defeat the safety features of this device and may result in severe personal injury or death.

2 L62AA BASO Safety Shutoff Device Installation Instructions

SAFETY MECHANISM

WARNING

EXPLOSION HAZARD

SERIOUS INJURY OR DEATH CAN RESULT

DO NOT REMOVE SHIELD

0.206 in. (5.23 mm) Diameter

Mounting Holes

Reset Button

Power Unit

Assembly

BASO Power Unit Terminal

0.206 in. (5.23 mm) Diameter

Mounting Hole

Wire

Terminals

Conduit

Opening

Do not loosen brass hex nut. Must be tight to maintain continuity.

Figure 1: View of the L62AA Without the Cover

Power Source

Transformer

Thermostat

"X"

Thermocouple

Lead

Pilot Burner

Gas Line

“X” indicates possible

locations for other controls.

76.2 mm (3 in.) Sediment

Trap

Main Manual Shutoff Valve

(”A” Valve)

Pilot

Valve

(”B” Valve)

L62AA

Safety Shutoff Device

BASO

Power Unit

Terminal

Basotrol

Valve

Figure 2: Typical L62AA Installation

L62AA BASO Safety Shutoff Device Installation Instructions 3

Setup and Adjustments

Checkout

WARNING: Risk of Explosion or Fire.

Follow this or an equivalent checkout procedure after installation. Before leaving the installation, verify that the L62AA functions properly and that the system has no gas leaks. Gas leaks can lead to an explosion or fire, and may result in severe personal injury or death.

Make sure all components are functioning properly by performing the following test.

1. Test all joints and connections for leaks with a soap solution.

2. Set the thermostat to the lowest setting.

3. Close the main manual shutoff valve (“A” valve) and the pilot valve (“B” valve [see Figure 2]) and wait at least five minutes for unburned gas to escape from the appliance.

4. Reopen the “B” valve and ignite pilot gas. Wait for 30 to 45 seconds.

5. Push down the red indicator and aluminum reset button to its full limit of travel and release. If the red indicator remains depressed, the unit is operative. If the red button does not stay depressed, wait an additional 30 seconds and try again. If the second attempt is not successful, check that the thermocouple output meets the value in Table 1.

6. Open the “A” valve after the red indicator button remains in the depressed position. The main burner will ignite from the pilot burner when the thermostat calls for heat.

7. Disconnect the thermocouple from the L62AA. The main valve should close immediately. If it does not close, check for wiring errors. Reconnect the thermocouple to the L62AA when it is operating correctly.

8. Make sure the brass hex nut is tight for good continuity. Do not over tighten.

9. Check the millivoltage output of the thermocouple and milliampere dropout range at the BASO power unit terminal to see that they meet the values in Table 1 and Table 2. Step-by-step procedures for these checks are included with the Y99AB BASO Test Kit.

10. Re-light the pilot.

11. Observe at least three complete operating cycles to make sure that all components are functioning correctly.

12. Reset the thermostat to a normal temperature setting before leaving the installation.

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