Emerson Process Management 37-5392D User Manual
3049-41
Mercury Flame Sensor
Operator: Save these instructions for future use!
CAUTION
!
WARNING
!
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY
BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE
PERSONAL INJURY AND/OR PROPERTY DAMAGE.
Mercury flame sensors are used in pilot burners to detect
the presence of the pilot flame. If the pilot flame is not
burning or is insufficient to properly ignite the main
burner, the flame sensor will prevent the flow of gas to the
main burner.
The bulb configuration and method of mounting the
sensor to the pilot burner is designed for use with F10 pilot
burners only. This is not a universal replacement. The
3049-41 sensor can only be used to replace the identical
type in applications where it was originally installed by the
equipment manufacturer. If the mercury flame sensor you
are replacing is not the same type number, contact the
original equipment manufacturer (OEM) for a suggested
replacement.
3049-41
Mercury Flame Sensor
INST ALLA TION INSTRUCTIONS
DESCRIPTION
PRECAUTIONS
This control is a precision instrument and should be
handled carefully. Rough handling or distorting components could cause the control to malfunction.
CAUTION
!
To prevent electrical shock and/or equipment
damage, disconnect electric power to the system at the main fuse or circuit breaker box until
installation is complete.
Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper
and dangerous operation.
ATTENTION!
This product contains mercury. There will not be any exposure to mercury under normal conditions of use. This
product may replace a unit which contains mercury. Do not open mercury cells. If a cell becomes damaged, do not
touch any spilled mercury. Wearing nonabsorbent gloves, take up the spilled mercury with sand or other absorbent
material and place into a container which can be sealed. If a cell becomes damaged, the unit should be discarded.
Mercury must not be discarded in household trash. When this unit or the unit it is replacing is to be discarded, place
in a suitable container and return to us.
Following installation or replacement, follow appliance manufacturer's recommended installation and/or service instructions to insure proper
operation.
Do not use on circuits exceeding specified voltage. Higher voltage will damage control and could
cause shock or fire hazard.
WHITE-RODGERS
EMERSON ELECTRIC CO.
9797 Reavis Road St. Louis, Missouri 63123-5398
9999 Hwy 48 Markham, Ontario Canada 0L3P 3J3
www.white-rodgers.com
Printed in U.S.A.
PART NO. 37-5392D
Replaces 37-5392C
0135
Switch action
N.O.
N.C.
2 (HOT)
4 (COM)
3
(COLD)
SPECIFICATIONS
Switch Action: SPDT
Electrical Ratings: 3.0 amps @ 30 VAC
1.0 amps @ 120 VAC
0.5 amps @ 240 VAC
INSTALLATION
CAUTION
!
To avoid personal injury and/or property damage, shut off gas and electrical power to the
heating system until installation is complete.
1. Unscrew flame sensor mounting nut from the pilot
burner and remove old flame sensor. Do not disconnect wiring from the switch case at this time.
2. Insert replacement flame sensor in pilot burner and
secure with mounting nut. Be sure the new sensing
bulb is in the same position relative to the pilot flame
as the sensor it replaced.
3. Carefully uncoil the capillary until the switch case
reaches its mounting location. Remove mounting
screws and replace old switch case with the new
switch case.
4. Make electrical connections by removing one wire at
a time from the old sensor and transferring it to the
corresponding terminal on the new switch case.
5. Turn on gas and electrical power to the system.
Check the system for proper operation. The pilot
flame will heat the sensor sufficiently to close the
(HOT) contact and allow the main burner to ignite
when the thermostat calls for heat. Upon loss of pilot
flame, the sensor will cool and transfer to the cold
contact, which prevents the gas valve from being
energized.
Terminals: Three 0.250” spade terminals
Capillary Length: 48 inches
Sensing Bulb Type:7⁄16-27 threaded nut for mounting
to pilot burner
4
3
2
Terminal location
on switch case
2
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