M1-M2 and M3-M4 are always first switches to turn ON and last to turn OFF. All other switches are random ON and random OFF
➁
24A34-14 Switch contacts designated F
1
- F
2
instead of M
1
- M
2
♦
These contacts switch simultaneously
NOTE:
Underwriters Laboratories requires a fan interlock circuit to insure the blower remains operating whenever more than one sequencer is used. The fan in-
terlock should be the M
1
/ M
2
contacts of the second or third sequencer. All M
1
/ M
2
contacts are wired to the blower motor so that any sequencer that is energized
will keep the blower ON.
PART NO. 37-4800C
www.white-rodgers.com
www.emersonclimate.com
Replaces 37-4800B
1050
WIRING DIAGRAMS
FAN DELAY OFF
WIRING
I
2
3
H
H
Normally close
Normally open
FOR THREE ELEMENT FURNACES WITH
COMBINATION FAN & HEATER LOADS
SINGLE-STAGE Room Thermostat
WIRING
M5
ONE POLE
H
M1
M6
H
M2
M4
H
To 3rd element
To 24vAC wall thermostat
To fan & 1st element
To 2nd element
(One Timing)
24A34-15
FOR ONE ELEMENT FURNACES
COMBINATION Fan and Heater Loads
WIRING
M1
H
M2
H
To 1st element & fan
To 24 VAC wall thermostat
TWO POLE
M3
H
(Two Timings)
24A34-5
ONE POLE
TWO-STAGE Room Thermostat Option
WIRING
M5
TWO POLE
M7
H
M1
TWO POLE
M3
H
M6
M8
H
M2
M4
H
To 3rd element
To 24vAC wall thermostat
To fan & 1st element
To 2nd element
(One Timing)
24A34-1 / -2
SEPARATE Fan and Heater Loads
WIRING
M1
TWO POLE M3
H
M2
M4
H
To fan
To 1st element
To 24vAC wall thermostat
(Two Timings)
24A34-6
(One Timing)
24A34-3 / -4
FOR TWO ELEMENT FURNACES
COMBINATION Fan and Heater Loads
WIRING
M1
TWO POLE M3
H
M2
M4
H
To 1st element & fan
To 2nd element
To 24vAC wall thermostat
FOR THREE ELEMENT FURNACES WITH
SEPARATE FAN & HEATER LOADS
SINGLE-STAGE Room Thermostat
WIRING
M5
TWO POLE
M7
H
M1
TWO POLE
M3
H
M6
M8
H
M2
M4
H
To 2nd element
To 3rd element
To 24vAC wall thermostat
To fan
To 1st element
(One Timing)
24A34-3 / -4
SEPARATE Fan and Heater Loads
WIRING
M5
ONE POLE
H
M1
TWO POLE
M3
H
M6
H
M2
M4
H
To fan
To 1st element
To 24vAC wall thermostat
M1
TWO POLE M3
H
To 2nd element or aux. contacts
(Two Timings)
24A34-5
TWO-STAGE Room Thermostat Option
WIRING
M2
M4
H
To fan interlock
To 3rd element
To W2 of 24vAC wall thermostat
(Two Timings)
24A34-5
(One Timing)
24A34-3 / -4
M5
TWO POLE
M7
H
M6
M8
H
M2
M4
H
To common of 24v transformer
To 2nd element
To W1 of 24vAC wall thermostat
To fan
To 1st element
DOTTED LINE BETWEEN "H" TERMINAL
IS A FACTORY-INSTALLED JUMPER
M1
TWO POLE
M3
H
(Two Timings)
24A34-6
2
WIRING DIAGRAMS
FOR FOUR ELEMENT FURNACES
COMBINATION Fan and Heater Loads
SINGLE-STAGE Room Thermostat
WIRING
M5
TWO POLE
M7
H
M1
TWO POLE
M3
H
M6
M8
H
M2
M4
H
To 3rd element
To 4th element
To 24vAC wall thermostat
To fan & 1st element
To 2nd element
TWO POLE
ONE POLE
M5
H
M1
M3
H
M6
H
M2
M4
H
FOR FIVE ELEMENT FURNACES
COMBINATION Fan and Heater Loads
TWO-STAGE Room Thermostat Option After 3rd Element
WIRING
To 5th element
To W2 of 24vAC wall thermostat
To fan interlock
To 4th element
(Two Timings)
24A34-6
M5
(Two Timings)
24A34-5
M6
M8
H
M2
M4
H
To common of 24v transformer
To 3rd element
To W1 of 24vAC wall thermostat
To fan & 1st element
To 2nd element
TWO-STAGE Room Thermostat Option after 2nd Element
WIRING
M5
ONE POLE
H
M1
TWO POLE
M3
H
M6
H
M2
M4
H
To 4th element
To W2 of 24vAC wall thermostat
To fan interlock
To 3rd element
TWO POLE
M7
H
M1
TWO POLE
M3
H
(Two Timings)
24A34-6
(Two Timings)
24A34-5
SEPARATE Fan and Heater Loads
M5
ONE POLE
H
M1
TWO POLE
M3
H
M6
H
M2
M4
H
To common of 24v transformer
To W1 of 24vAC wall thermostat
To fan & 1st element
To 2nd element
TWO POLE
M5
M7
H
M1
TWO POLE
M3
H
M6
M8
H
M2
M4
H
TWO-STAGE Room Thermostat Option After 2nd Element
WIRING
To 4th element
To 5th element
To W2 of 24vAC wall thermostat
To fan interlock
To 3rd element
(Two Timings)
24A34-5
SEPARATE Fan and Heater Loads
TWO-STAGE Room Thermostat Option after 2nd Element
WIRING
M5
ONE POLE
H
M1
TWO POLE
M3
H
M6
H
M2
M4
H
To 4th element
To W2 of 24vAC wall thermostat
To fan interlock
To 3rd element
TWO POLE
TWO POLE
M5
M7
H
M1
M3
H
(Two Timings)
24A34-6
M6
M8
H
M2
M4
H
To common of 24v transformer
To 2nd element
To W1 of 24vAC wall thermostat
To fan
To 1st element
(Two Timings)
24A34-5
M5
TWO POLE
M7
H
M1
TWO POLE
M3
H
M6
M8
H
M2
M4
H
To common of 24v transformer
To 2nd element
To W1 of 24vAC wall thermostat
To fan
To 1st element
(Two Timings)
24A34-6
(Two Timings)
24A34-6
DOTTED LINE BETWEEN "H" TERMINAL
IS A FACTORY-INSTALLED JUMPER
3
WIRING DIAGRAMS
FOR SIX ELEMENT FURNACES
COMBINATION Fan and Heater Loads
TWO-STAGE Room Thermostat Option After 3rd Element
WIRING
M5
TWO POLE
M7
H
M1
TWO POLE
M3
H
M6
M8
H
M2
M4
H
To 5th element
To 6th element
To W2 of 24vAC wall thermostat
To fan interlock
To 4th element
TWO POLE
M5
ONE POLE
H
M1
M3
H
M6
H
M2
M4
H
FOR SEVEN ELEMENT FURNACES
COMBINATION Fan and Heater Loads
TWO-STAGE Room Thermostat Option After 3rd or 5th Element
WIRING
To 7th element
To W2 of 24vAC wall thermostat
To fan interlock
To 6th element
(Two Timings)
24A34-6
TWO POLE
M5
TWO POLE
M7
H
M1
TWO POLE
M3
H
M6
M8
H
M2
M4
H
To common of 24v transformer
To 3rd element
To W1 of 24vAC wall thermostat
To fan & 1st element
To 2nd element
TWO POLE
(Two Timings)
24A34-5
M5
M7
H
M1
M3
H
M6
M8
H
M2
M4
H
To common of 24v transformer
To 5th element
To W2 of 24vAC wall thermostat
To fan interlock
To 4th element
(Two Timings)
24A34-6
M5
TWO POLE
M7
H
M1
TWO POLE
M3
H
M6
M8
H
M2
M4
H
To common of 24v transformer
To 3rd element
To W1 of 24vAC wall thermostat
To fan & 1st element
To 2nd element
(Two Timings)
24A34-6
SEPARATE Fan and Heater Loads
TWO-STAGE Room Thermostat Option After 2nd or 4th Element
WIRING
M5
ONE POLE
H
M1
TWO POLE
M3
H
M6
H
M2
M4
H
To 6th element
To W2 of 24vAC wall thermostat
To fan interlock
To 5th element
(Two Timings)
24A34-6
SEPARATE Fan and Heater Loads
TWO-STAGE Room Thermostat Option After 3rd or 5th Element
京公网安备 11010802033920号
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