Install Instructions

SureSwitch is similar to a 1
1
/
2
pole contactor, in that L1 only the
compressor terminal T1(C) is switched. The compressor terminal T2(R)
is connected by a shorting bar to line input L2, and is energized even
when a call is not present.
49M11-843
Emerson SureSwitch™ Multi-Volt
PART NO. 37-7810001
2017
INSTALLATION INSTRUCTIONS
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE
INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY
AND/OR PROPERTY DAMAGE.
SPECIFICATIONS
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.
Installation should be done by a qualied heating and air conditioning
contractor or licensed electrician.
Do not exceed the specication ratings.
All wiring must conform to local and national electrical codes and
ordinances.
ELECTRICAL RATINGS
Line Voltage Input...............120/208/240 VAC, 1-phase, 50/60 Hz
Full Load Amperes (FLA) ..................40 A
Locked Rotor Amperes (LRA)............200A
24 VAC Control (Coil) Voltage (Y, C) ...24 VAC, 50/60 Hz
120/240 VAC Control (Coil) Voltage (L1/L2).....120/208/240 VAC,
1-phase, 50/60 Hz
emerson.com/white-rodgers
Failure to comply with the following warnings could result in personal
injury or property damage.
FIRE HAZARD
• Do not exceed the electrical ratings for voltage and current.
• 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 or changing settings.
• Ensure proper earth grounding of appliance.
• Ensure proper connection of the L1 and L2 wires.
• Compressor output T2(R) is not switched and is energized at all times.
WARNING
!
RECOMMENDED LUG TORQUE – L1, L2, T2(R) and T1(C)
#4 – 6 AWG ......................................................... 45 in-lbs
#8 AWG .............................................................. 40 in-lbs
#10 – 14 AWG ..................................................... 35 in-lbs
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.
Line
Inputs
L1
L2
Run
T2
T1
Common
Compresso
r
Outputs
Fan
Common
Hardstart
Option
Compressor/Fan
Capacitor Outputs
Count Button
COUNT
Delay
Brown
ON
TEST
Test
Button
Short Cycle
Protection
Delay
Dipswitch
Brownout Protection
Brown Dipswitch
Tri-Color LED
Fault/Status Indicator
Contactor
Coil Inputs
Crankcase Heater
Power
Disconnect power before
changing settings.
Disconnect power before
changing settings.
MAIN HOUSING
Housing
Screws
Mounting
Holes
MOUNTING PLATE
INSTALLATION
1. Disconnect power to the condensing unit or equipment at the
disconnect switch and/or main electrical panel. Ensure that all
sources of power are disconnected before proceeding.
2. Label wires and remove old contactor.
3. Find a suitable mounting location inside the control box. Rotate
SureSwitch as necessary to allow space for wiring and other
components.
4. Loosen four housing captive screws attaching the bottom
mounting plate to the main housing and separate the mounting
plate from the main housing.
5. The bottom of the mounting plate has four mounting holes that
match the typical mounting screw locations of a single or two-pole
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