White Rodgers 57T01-843 specifications Operation and Checkout

INSTALLATION

Location

Mount the relay on a flat, 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

A B 6 T 4

3 (NO)	Refer to label on side
1 (COM)	of relay for information
	on terminal functions.

Fig. 1. Mounting 57T01-843 on panel

C3	R2	R12	A		24 VAC Rd
				E1
					from Transformer
R8			B		24 VAC Common BL
				E3
		RV1			from Transformer
		K1	6		WH/J to Heater Plug
C1 R1		HIGH VOLTAGE FAN		E4
					Connection
C5
		1 (COM)	T		GR from LV Field
				E2
C6					Connection
C7		3 (NO)	4		BL Common from
	K2			E5	LV Field Connection

Fig. 2. 57T01-843 Terminal Designations

4 1

B

T

A 6 3

Fig. 3. Mounting 57T01-843 on panel

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.

1 3

2

4 6 5

A

B T

TIME DELAY BOARD

TERMINAL CONNECTION

DESIGNATION

A24 Vac LINE (HOT SIDE)

B24 Vac COMMON

TFAN TERMINAL ON THERMOSTAT 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 efficiency 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.

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.

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