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
Specifications
...................................................................
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-Voltage Brownout Protection
• Short Cycle Protection
• Random Start Delay
• Lifetime Cycle Count
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
L
1
, and is energized even
when a call is not present.
Installation should be done by a qualified heating and air conditioning
contractor or licensed electrician.
Do not exceed the specification ratings.
All wiring must conform to local and national electrical codes and
ordinances.
This control is a precision instrument, and should be handled carefully.
Rough handling or distorting components could cause the control to
malfunction.
Following installation or replacement, follow manufacturer's
recommended installation/service instructions to ensure proper
operation.
SureSwitch has no user serviceable parts. Replace as a unit.
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
• Do not exceed the specified voltage.
• Replace existing control with exact model and dash
number.
• Protect the control from direct contact with water
(dripping, spraying, rain, etc.).
• If the control has been in direct contact with water,
replace the control.
• Label all wires before disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation.
• Safety route and secure wiring after installation.
SHOCK HAZARD
• Disconnect electric power before servicing.
• Ensure proper earth grounding of appliance.
• Ensure proper connection of line neutral and line hot
wires.
• Compressor output "R" is not switched and is
energized at all times.
WARNING
!
