49P11-843
Emerson SureSwitch™
PART NO. 37-7295B
Replaces 37-7295A
1304
INSTALLATION INSTRUCTIONS
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE
INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY
AND/OR PROPERTY DAMAGE.
PRECAUTIONS
CONTENTS
Description ....................................................................... 1
Precautions ....................................................................... 1
Specications ................................................................... 2
Mounting .......................................................................... 2
Quick Reference ................................................................... 2
Operation ......................................................................... 3
Troubleshooting ............................................................... 3
Wiring Diagram .................................................................... 4
DESCRIPTION
SureSwitch™ is an electronically-controlled relay that can be used
to replace single and two-pole contactors commonly used in air
conditioners, heat pumps and other applications. A patented switching
algorithm reduces arcing between contacts, which nearly eliminates
pitting and welding for a longer life. The switching mechanism is sealed
to prevent intrusion from insects and other debris.
SureSwitch also provides advanced features for HVAC troubleshooting
and system reliability:
• Line-VoltageBrownoutProtection
• ShortCycleProtection
• RandomStartDelay
• LifetimeCycleCount
SureSwitch is similar to a 1
1
/
2
pole contactor, in that only the
compressor terminal C is switched. The compressor terminal R is
connected by a shorting bar to line input L1, and is energized even
when a call is not present.
Installationshouldbedonebyaqualiedheatingandairconditioning
contractor or licensed electrician.
Donotexceedthespecicationratings.
All wiring must conform to local and national electrical codes and
ordinances.
This control is a precision instrument, and should be handled carefully.
Roughhandlingordistortingcomponentscouldcausethecontrolto
malfunction.
Following installation or replacement, follow manufacturer's
recommended installation/service instructions to ensure proper
operation.
SureSwitchhasnouserserviceableparts.Replaceasaunit.
www.white-rodgers.com
www.emersonclimate.com
Operator: Save these instructions for future use!
Failure to comply with the following warnings could result
in personal injury or property damage.
FIRE HAZARD
• Donotexceedthespeciedvoltage.
• Replaceexistingcontrolwithexactmodelanddash
number.
• Protectthecontrolfromdirectcontactwithwater
(dripping, spraying, rain, etc.).
• Ifthecontrolhasbeenindirectcontactwithwater,
replace the control.
• Labelallwiresbeforedisconnectionwhenservicing
controls. Wiring errors can cause improper and
dangerous operation.
• Safetyrouteandsecurewiringafterinstallation.
SHOCK HAZARD
• Disconnectelectricpowerbeforeservicing.
• Ensureproperearthgroundingofappliance.
• Ensureproperconnectionoflineneutralandlinehot
wires.
• Compressoroutput"R"isnotswitchedandis
energized at all times.
WARNING
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