White Rodgers 57T01-843 User Manual

WARNING

!

FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE

WARNING

!

WARNING

!

INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL
INJURY AND/OR PROPERTY DAMAGE.

APPLICATION

57T01-843

Time Delay Relay

Installation and Operating Instructions

Operator: Save these instructions for future use!

This document provides installation and checkout procedures
for the 57T01-843 Time Delay Relay.

Hazardous voltage – disconnect power before servicing.

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.

SPECIFICATIONS

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

The 57T01-843 Time Delay Relay is for use in compres­sor-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 control­led 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 la­beled the same, but are in a different physical location on the
new part (see fi gs 1, 2, 3, 4).

CAUTION

!

All phases of this installation must comply with National,
State and Local Codes.

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)

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.

www.white-rodgers.com

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.

PART NO. 37-6970A

0831

INSTALLATION

Location

Mount the relay on a fl at, solid surface inside the equipment
control box. The relay may be panel- or wall-mounted with
the base vertical or horizontal. If base is horizontal, it must be
mounted with the terminals up. Secure with the two screws
through holes or slots in the mounting base or as shown in
Fig. 1.

Wiring

Disconnect power supply before connecting wiring to prevent
electrical shock or equipment damage.

All wiring must comply with local codes and ordinances.

Crimp female quick-connects to the system wires, if needed,
and attach to the male quick-connect terminals on the time
delay board.

Terminal designations on 57T01-843 correspond directly to
terminal designations on RLY02807 and RLY02257 relay.
Therefore, wires are to be connected to the same lettered or
numbered terminal on the 57T01-843 relay as they were on
the RLY02807 and RLY02257 relay. For example, the wire
connected to terminal #4 on RLY02807 or RLY02257 relay
should be connected to terminal #4 on 57T01-843 relay, etc.
Terminals 1 (COM) and 3 (N.O.) are high voltage fan relay
terminals.

No Off Delay Wiring

For No Off delay operation remove the red wire from terminal
“A” and the green wire from terminal “T.” Take the red wire that
was removed from terminal “A” and connect to terminal “T.”
Next take the green wire that was removed from terminal “T”
and connect to terminal “A.” You may hear a double click when
energized which is normal.

Make sure all wires are connected to the proper terminals on
the time delay board for proper system operation. Refer to
Figs. 1-4 for terminal designations and wiring connections.

Do not exceed contact and coil ratings when wiring into
system.

AB 6 T 4

1 (COM)

3 (NO)

Refer to label on side
of relay for information
on terminal functions.

Fig. 1. Mounting 57T01-843 on panel

C3

R8

R1

C1

C5

C6

C7

K2

HIGH VOLTAGE FAN

1 (COM)

3 (NO)

RV1
K1

24 VAC Rd

E1

from Transformer

B

24 VAC Common BL

E3

from Transformer

6

WH/J to Heater Plug

E4

Connection

T

GR from LV Field

E2

Connection

4

BL Common from

E5

LV Field Connection

A

R12

R2

Fig. 2. 57T01-843 Terminal Designations

4 1

B

T

A63

Fig. 3. Mounting 57T01-843 on panel

13

2

46

5

A

BT

TIME DELAY BOARD

TERMINAL

DESIGNATION

CONNECTION

A 24 Vac LINE (HOT SIDE)

24 Vac COMMON

B

FAN TERMINAL ON THERMOSTAT

T

OR OTHER CONTROLLER

Fig. 4. 57T01-843 Circuit and terminal designations

OPERATION AND CHECKOUT

Operation

When the thermostat calls for indoor blower operation, an
electronic switch in the electronic board pulls in and powers
the relay coil. When the call ends, the electronic switch in the
electronic board holds in the relay coil for an additional 80
seconds. This increases the effi ciency of the equipment and
saves energy.

NOTE: When power is initially applied during installation or
after power interruption, the relay will pull in for a maximum of

0.5 seconds and then drop out.

White-Rodgers is a division
of Emerson Electric Co.

The Emerson logo is a
trademark and service mark
of Emerson Electric Co.

St. Louis, Missouri

www.white-rodgers.com

Checkout

When power is initially applied, check to make sure the relay
pulls in for not more than 0.5 seconds and drops out. Then
operate the relay and controlled equipment to make sure
that the relay pulls in when the T terminal is energized with
24 VAC and that controlled equipment operates as intended.
Relay pulls in after a short on delay of 2 seconds (±0.7).
When the T terminal is deenergized (24 VAC removed), the
indoor air blower should continue to operate until the delay
period (80 seconds) ends.