Master Catalog
Gas Programming Controls and Devices Section
Product Bulletin
Issue Date
125
L
L61, L62
0996
L61, L62 Series
BASO Automatic Pilot Switches
®
Application
BASO pilot switches are used in
a wide variety of applications, for
example: with domestic central
heating and commercial space
heating appliances, and with
industrial processing equipment
such as die casting machines,
degreasers, etc.
L61 and L62 pilot switches are
for use on all gas fired, standing
pilot equipment that is operated
by a low or line voltage
thermostat and has the
application requirement that the
main burner be shut off if the
pilot is extinguished. Models
with 100% shutoff are available
if it is desired that pilot gas, in
addition to the main burner gas,
be shut off.
General Description
The L62 pilot switch has a
manual reset feature, and is
available in models with or
without 100% shutoff. The
L62’s thermo-electric power unit
assembly receives its energy
from a heated thermocouple. If
the pilot flame is extinguished,
the main valve circuit is
interrupted and gas flow to the
appliance’s main burner (and
pilot in 100% shutoff models) is
stopped. Both the 100% and
non-100% shutoff models
contain an electric interruption
feature that allows only pilot
gas flow during the lighting or
resetting cycle.
The L61 pilot switch is an
automatic recycling switch which
opens the main gas valve’s
electrical circuit if the pilot flame
goes out. Lighting or relighting
the pilot burner causes the
switch to close the electrical
circuit to the gas valve,
permitting the appliance’s main
burner to operate. The L61, like
the L62, derives its power from a
single heated thermocouple.
However, on L61 models, minor
fluctuations of the pilot flame
which might cause the switch to
drop out but does not extinguish
the pilot flame will not shut down
the appliance permanently
because the switch will
automatically close and restore
service upon resumption of a
normal pilot flame. L61 models
are available with single-pole,
double-throw switching action
when an additional switching
function, such as a signal light,
is desired.
Fig. 1 -- Exterior view of the
L62AA Switch.
Thermocouple Leads
For L61 models, use Johnson
Controls K15D on applications
requiring leads up to 40 in., and
the K16B for leads over 48 in.
For L62 models, use the K16D
for leads up to 48 in., and the
K16B for leads from 60 in. thru
72 in.
Specifications
Fig. 2 -- Exterior view of the
L62GB-3 with universal
mounting bracket.
© 1996 Johnson Controls, Inc.
Code No. LIT-125360
1
Fig. 3 -- Cut-away view
of the L62AA.
Fig. 4 -- Cut-away view
of the L61LL.
Fig. 5 -- Exterior view
of the L61LL.
Wiring
Wiring should conform to
applicable codes. Pilot switches
are wired in series with the limit
control and main gas valve.
Mounting
L62 switches can be mounted in
any position; however, the L61
must be mounted in the vertical
position only, with the
thermocouple connection down.
Both models can be mounted in
any convenient location by
fastening the unit to a control
panel or to the appliance using
the mounting holes on the back
of the case.
Packaging
Ordering Information
When ordering, specify the
complete Product Number, if
available.
If a variation from standard
models is required, specify the
Type Number of switch
(example; L62AA) and:
Bulk pack supplied to original
equipment manufacturer;
individual pack is optional at
additional cost. Non-OEM
buyers furnished individual pack
only.
1.
Features required.
2.
Electrical specifications,
including a circuit diagram,
if possible.
3.
Quantity needed.
Repairs and Replacement
4.
State any other
environmental or unusual
conditions that exist on the
application.
Field repairs must not be made.
For a replacement switch,
contact the nearest Johnson
Controls wholesaler.
Dimensions
Performance specifications appearing herein are nominal
and are subject to accepted manufacturing tolerances and application variables.
Controls Group
507 E. Michigan Street
P.O. Box 423
Milwaukee, WI 53202
2 L61, L62 Product Bulletin
Printed in U.S.A.