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57T01-843
Time Delay Relay
Installation and Operating Instructions
This document provides installation and checkout procedures
for the 57T01-843 Time Delay Relay.
WARNING
!
This information is for use by individuals having adequate
backgrounds of electrical and mechanical experience.
Any attempt to repair a central air conditioning product
may result in personal injury and/or property damage.
The manufacturer or seller cannot be responsible for
the interpretation of this information, nor can it assume
any liability in connection with its use.
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE
INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL
INJURY AND/OR PROPERTY DAMAGE.
Operator: Save these instructions for future use!
WARNING
!
Hazardous voltage – disconnect power before servicing.
APPLICATION
The 57T01-843 Time Delay Relay is for use in compres-
sor-run air conditioning and heat pump systems to delay the
blower shut-off after the compressor has shut off. This delay
allows the residual cooled air to be blown into the control-
led space, increasing the effi ciency of the system in cooling.
Depending on electrical hookup in a heat pump system, delay
of blower shut-off could also occur in heating.
Relay switching has 80 (±16) second delay timing.
Installation of the new ETDR is the same, terminals are la-
beled the same, but are in a different physical location on the
new part (see fi gs 1, 2, 3, 4).
SPECIFICATIONS
Pilot Duty Pole ............................. Min: 3 VA at 24
Max: 25 VA at 24 VAC
Min voltage req. for pickup ........... 75 percent of nominal
coil voltage
Input voltage ................................ 24 VAC nominal
Total Power Consumption ............ 0.5 VA (relay deenergized)
4.0 VA (relay energized)
Electrical Ratings
Contact Ratings:
Power Pole (Amperes per pole)—
208/240/277 VAC
Full Load 7
Locked Rotor 36
Resistive 15
U.L. Approved Horsepower 3/4 hp
CAUTION
!
All phases of this installation must comply with National,
State and Local Codes.
www.white-rodgers.com
PART NO. 37-6970A
0831
INSTALLATION
When installing this product...
1. Read these instructions carefully. Failure to follow them
could damage the product or cause a hazardous condition.
2. Check the ratings given in the instructions and on the
product to make sure the product is suitable for your
application.
3. Installer must be a trained, experienced service technician.
4. After installation is complete, check out product operation
as provided in these instructions.
WARNING
!
Disconnect all electric power including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect all power
before servicing can cause severe personal injury or
death.