Installation Instructions
Issue Date January 21, 2015
© 2015 BASO Gas Products 1
Part No. BASO-INS-L61, Rev. B www.baso.com
L61LL BASO® Safety Shutoff Device
Installation
!
WARNING: Risk of Explosion or Fire.
Do not use the L61LL in Liquefied Petroleum
(LP) gas applications. The L61LL 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 L61LL. 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.
To install the L61LL.
1. Turn off all power to the appliance.
2. Turn off the gas at the main manual shutoff valve
adjacent to the appliance.
IMPORTANT: Do not loosen or tighten the
brass hex nut that fastens the brass therminal
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.
3. Remove the metal snap-on cover from the L61LL
(not the brass hex nut).
4. Mount the L61LL on a vertical surface with the
thermocouple connection positioned downward.
5. Push the circuit wires through the conduit opening
on the bottom of the L61LL, strip the ends of the
wires just enough to put the bare wire under the
terminal screws, and connect the circuit wires
according to the appliance manufacturer’s
instructions or the wiring information on the label
(see Figure 1).
!
WARNING: Risk of Explosion or Fire
Do not attach both wires to one terminal on the
L61LL. Doing so bypasses and eliminates all safety
features provided by the L61LL and 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 L61LL BASO Safety Shutoff Device Installation Instructions
R
C
US
ELECTRICAL RATING:
CIRCUIT 1-2
8A. AT 120 V.A.C.
4A. AT 240 V.A.C.
1/4HP,
120/240 V.A.C.
CIRCUIT 1-3
125VA PILOT DUTY
120/240 VOLTS AC
L61LL-1
CIRCUIT #1-#2 #1-#3
PILOT ON CLOSED OPEN
PILOT OFF OPEN CLOSED
1
2 3
Do not loosen brass hex nut.
Must be tight to maintain continuity.
Figure 1: L61LL Product Label
6. Replace the metal snap-on 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 L61LL. Make sure that
this connection is clean. Tighten the thermocouple
lead nut finger tight plus 1/8 turn maximum. Do
not overtighten.
Power Source
Transformer
Thermostat
X
X
L61LL
Safety Shutoff Device
Pilot
Valve
( Valve)B
Basotrol
Valve
Thermocouple
Lead
Pilot Burner
Gas Line
X indicates possible
locations for other controls.
76.2 mm (3 in.)
Sediment
Trap
Main Manual
Shutoff Valve
( Valve)A
BASO
Power Unit
Terminal
Figure 2: Typical L61LL Installation
L61LL 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 L61LL 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. Open the main manual shutoff valve (A valve).
2. Test all joints and connections for leaks with a
soap solution.
3. Set the thermostat to the lowest temperature
setting.
4. 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.
5. Reopen the B valve and ignite the pilot gas. In
approximately one minute, the L61LL device
closes, establishing a circuit to the main gas valve.
6. When the circuit to the main gas valve is
established, open the A valve. The main burner
will ignite from the pilot burner when the
thermostat calls for heat.
7. Disconnect the thermocouple from the L61LL. The
main valve should close immediately. If it closes,
reconnect the L61LL. If it does not close, check for
wiring errors and repeat
Steps 1 through 5.
8. Make sure 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-4
BASO® Test Kit Application Note.
10. Relight the pilot.
11. Observe at least three complete operating cycles
of the appliance to make sure all components are
functioning correctly.
12. Reset the thermostat to a normal temperature
setting before leaving the installation.
Repairs and Replacement
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,
Table 2 and Table 3. If the reading does not meet
these values, replace the thermocouple and/or the
safety shutoff device.
Table 1: Thermocouple Output
Thermocouple
mV Range
Lead
Type
Turn
Down
Normal
Not Less
Than
K15
4 mV
20-28
15
K16
4 mV
25-35
17
K17
4 mV
30-40
25
K19
4 mV
25-35
17
Note: In high temperature locations, use
K15 or K16 Series.
Table 2: L61LL Dropout Range
mA Range of Power Unit Assembly
Low
High
75
200
Table 3: L61LL Pull-In Range
mA Range of Power Unit Assembly
Low
High
220
400
4 L61LL BASO Safety Shutoff Device Installation Instructions
Pilot Servicing
If pilot flame problems occur, check the following:
If the pilot flame burns yellow, it may be due to dirt
or lint covering the lower portion of the pilot
burner. Remove dirt and lint using a soft brush or
a vacuum cleaner.
A flame approximately 1/2 in. (12.7 mm) high must
surround the thermocouple tip (see Figure 3).
Because this is an electrical connection, the
thermocouple lead connection to the BASO power
unit must be clean and free of grease.
Approximately
1/2 in. (12.7 mm)
Figure 3: Flame Position
Replacement Procedure
!
WARNING: Risk of Explosion or Fire.
Shut off the gas supply at the main manual shutoff
valve before installing or servicing the L61LL. 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.
!
WARNING: Risk of Explosion, Fire, or
Electrical Shock.
Label all wires before they are disconnected when
replacing the L61LL. Wiring errors can cause
improper or dangerous operation and may result in
an explosion, fire, or electrical shock, leading to
severe personal injury or death.
When necessary, replace the safety shutoff device as
follows:
1. Turn off all power to the appliance.
2. Close the main manual shutoff valve and the pilot
valve.
3. Disconnect the thermocouple lead from the safety
shutoff device.
4. Remove the metal snap-on cover from the old
safety shutoff device.
5. Disconnect and label wires from the three wire
terminals and remove the device from the
appliance.
6. Replace with the new BASO L61LL according to
Step 3 through 7 in the Installation section to
complete the installation.
7. Perform the steps in the Checkout section before
leaving the installation.
Repairs
Field repairs must not be made to the L61LL safety
shutoff device. If the thermocouple meets the output
listed in Table 1 and the valve does not function,
replace the entire device. Any attempt to repair this
assembly voids the manufacturer’s warranty. For a
replacement safety shutoff device, contact the nearest
BASO Gas Products distributor.
Table 3: L61LL Electrical Specifications
Action
L61LL Circuit 1-2
L61LL Circuit 1-3*
Pilot Off
Open
Closed
Pilot On
Closed
Open
Electrical Ratings
8A, 120 VAC
4A, 240 VAC
1/4 hp at 120/240 VAC
125 VA
Pilot Duty at 120/240 VAC
* Switch can be used on 24/25 VAC installations.
Note: Circuit 1-3 is intended for pilot ignition means only. Do not use in a safety circuit.
L61LL BASO Safety Shutoff Device Installation Instructions 5
Technical Specifications
Product
L61LL BASO Safety Shutoff Device
100% Shutoff
No
Conduit Opening
1
Maximum Ambient
Surface Temperature
-40 to 150ºF (-40 to 66ºC)
Reset
Automatic
Switch Action
Single-Pole, Double-Throw (SPDT)
Type of Gas
Natural
Packaging
Bulk pack supplied to original equipment manufacturer (individual pack optional).
Bulk Pack Quantity
48
Weight
29.5 kg (65 lb)
Agency Listings
CSA Certificate Number 229521-1656085
UL File Number MH2926
Specification Standards
ANSI Standard Z21.20
CAN 1-6.4
UL Standard 372
Performance specifications are nominal and conform to acceptable industry standards. All agency certification of BASO products is performed
under dry and controlled indoor environmental conditions. Use of BASO products beyond these conditions is not recommended and may void
the warranty. Product must be protected if exposed to water (dripping, spraying, rain, etc.) or other harsh environments. The original
equipment manufacturer or end user is responsible for the correct application of BASO products. Consult BASO Gas Products LLC for
questionable applications. BASO Gas Products LLC shall not be liable for damages or product malfunctions resulting from misapplication or
misuse of its products.
Refer to the L61, L62 Series BASO Safety Shutoff Device Product Bulletin (BASO-PB-L61/L62) for necessary information on operating and
performance specifications of this product.
BASO Gas Products LLC
1007 South 12th Street
P.O. Box 170 Published in U.S.A.
Watertown, WI 53094 www.baso.com
1-877-227-6427 (1-877-BASOGAS)
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