24A34 Series Fan/Heat Sequencers INSTALLATION INSTRUCTIONS FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY AND/OR PROPERTY DAMAGE. DESCRIPTION The 24A34 Series Fan/Heat Sequencer gives the service technician a direct replacement for sequencing both fan and heat. The terminal markings on the 24A34 sequencers are equivalent to most other manufacturers' types. These sequencers may be wired in series, as shown in wiring diagrams, to allow sequencing of one through seven element furnaces. ! CAUTION To prevent electrical shock and/or equipment damage, disconnect electric power to system, at main fuse or circuit breaker box, until installation is complete. Do not use on circuits exceeding specified voltage. Higher voltage will damage control and could cause shock or fire hazard. SPECIFICATIONS Electrical Ratings - Single Load Contact Ratings (All Models) VAC 120 240 480 Resistive (Non-Inductive) Watts Amps 3000 25.0 6000 25.0 6000 12.5 Motor Ratings (Inductive) Full Load Locked Rotor 14.0A 72.0A 7.0A 42.0A - - Pilot Duty 125 VA 125 VA 480 VA Electrical Ratings - Single Load Contact Ratings (All Models) Timings - ON Timings - OFF Model Number Timings Switches M1-M2 M3-M4 M5-M6 M7-M8 M9-M10 M1-M2 M3-M4 M5-M6 M7-M8 M9-M10 40-110 - - - - 24A34-1 1 1 1-20 - - - - - - 1-30 - - 24A34-2 1 1 - - 30-90 - - 40-110 40-110 - - - 1 2 1-20 1-20 - - - 24A34-3 - - 1-30 1-30 - 24A34-4 1 2 - - 30-90 30-90 - 1-110 1-110 1-110 - - 2 3 1-110 1-110 1-110 - - 24A34-5 1-110 1-110 1-110 1-110 - 2 4 1-110 1-110 1-110 1-110 - 24A34-6 1-160 4 5 1-160 1-160 1-160 1-160 1-160 1-160 1-160 1-160 1-160 24A34-14 75-95 - - - - 24A34-15 1 1 1-60 - - - - TABLE NOTES: 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 24A34-14 Switch contacts designated F1 - F2 instead of M1 - M2 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 interlock should be the M1 / M2 contacts of the second or third sequencer. All M1 / M2 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 FOR THREE ELEMENT FURNACES WITH COMBINATION FAN & HEATER LOADS WIRING I H 2 Normally close 3 Normally open SINGLE-STAGE Room Thermostat WIRING H (One Timing) 24A34-15 ONE POLE TWO POLE FOR ONE ELEMENT FURNACES M5 M6 To 3rd element H H To 24vAC wall thermostat M1 M2 To fan & 1st element M3 M4 To 2nd element H H (Two Timings) 24A34-5 COMBINATION Fan and Heater Loads WIRING ONE POLE M1 M2 To 1st element & fan H H To 24 VAC wall thermostat TWO-STAGE Room Thermostat Option WIRING (One Timing) 24A34-1 / -2 TWO POLE SEPARATE Fan and Heater Loads WIRING M1 M2 To fan TWO POLE M3 M4 To 1st element H H TWO POLE M5 M6 M7 M8 To 3rd element H H To 24vAC wall thermostat M1 M2 To fan & 1st element M3 M4 To 2nd element H H (Two Timings) 24A34-6 To 24vAC wall thermostat (One Timing) 24A34-3 / -4 FOR TWO ELEMENT FURNACES FOR THREE ELEMENT FURNACES WITH SEPARATE FAN & HEATER LOADS COMBINATION Fan and Heater Loads SINGLE-STAGE Room Thermostat WIRING M1 M2 To 1st element & fan TWO POLE M3 M4 To 2nd element H H WIRING TWO POLE To 24vAC wall thermostat (One Timing) 24A34-3 / -4 TWO POLE M5 M6 M7 M8 To 3rd element H H To 24vAC wall thermostat To 2nd element M1 M2 To fan M3 M4 To 1st element H H (Two Timings) 24A34-5 SEPARATE Fan and Heater Loads WIRING ONE POLE TWO POLE M5 M6 H H M1 M2 M3 M4 H H TWO-STAGE Room Thermostat Option To 2nd element or aux. contacts WIRING To fan M1 M2 TWO POLE M3 M4 To 1st element To 24vAC wall thermostat H (Two Timings) 24A34-5 To fan interlock To 3rd element H To W2 of 24vAC wall thermostat M5 M6 To common of 24v transformer M7 M8 To 2nd element H H To W1 of 24vAC wall thermostat (One Timing) 24A34-3 / -4 TWO POLE DOTTED LINE BETWEEN "H" TERMINAL IS A FACTORY-INSTALLED JUMPER TWO POLE M1 M2 To fan M3 M4 To 1st element H H (Two Timings) 24A34-6 2 WIRING DIAGRAMS FOR FOUR ELEMENT FURNACES FOR FIVE ELEMENT FURNACES COMBINATION Fan and Heater Loads COMBINATION Fan and Heater Loads TWO-STAGE Room Thermostat Option After 3rd Element SINGLE-STAGE Room Thermostat WIRING TWO POLE TWO POLE M5 M6 To 3rd element M7 M8 To 4th element To 24vAC wall thermostat H H M1 M2 To fan & 1st element M3 M4 To 2nd element H H WIRING ONE POLE TWO POLE M5 M6 To 5th element H H To W2 of 24vAC wall thermostat M1 M2 To fan interlock M3 M4 To 4th element H H (Two Timings) 24A34-5 (Two Timings) 24A34-6 TWO-STAGE Room Thermostat Option after 2nd Element TWO POLE WIRING M5 ONE POLE TWO POLE M6 To 4th element TWO POLE To W2 of 24vAC wall thermostat H H M1 M2 To fan interlock M3 M4 To 3rd element H H M5 M6 M7 M8 To 3rd element H H To W1 of 24vAC wall thermostat To common of 24v transformer M1 M2 To fan & 1st element M3 M4 To 2nd element H H (Two Timings) 24A34-6 (Two Timings) 24A34-5 SEPARATE Fan and Heater Loads ONE POLE TWO POLE M5 M6 To common of 24v transformer H H To W1 of 24vAC wall thermostat M1 M2 To fan & 1st element M3 M4 To 2nd element H H TWO-STAGE Room Thermostat Option After 2nd Element WIRING TWO POLE (Two Timings) 24A34-5 TWO POLE M5 M6 To 4th element M7 M8 To 5th element H M2 To fan interlock M3 M4 To 3rd element H H SEPARATE Fan and Heater Loads (Two Timings) 24A34-6 TWO-STAGE Room Thermostat Option after 2nd Element WIRING M5 ONE POLE TWO POLE M6 H H M1 M2 M3 M4 H H TWO POLE To 4th element To W2 of 24vAC wall thermostat To fan interlock TWO POLE To 3rd element TWO POLE M5 M6 To common of 24v transformer M7 M8 To 2nd element To W1 of 24vAC wall thermostat H H M1 M2 To fan M3 M4 To 1st element H H (Two Timings) 24A34-6 (Two Timings) 24A34-5 TWO POLE M5 M6 M7 M8 To 2nd element H H To W1 of 24vAC wall thermostat To common of 24v transformer M1 M2 To fan M3 M4 To 1st element H H To W2 of 24vAC wall thermostat H M1 (Two Timings) 24A34-6 DOTTED LINE BETWEEN "H" TERMINAL IS A FACTORY-INSTALLED JUMPER 3 WIRING DIAGRAMS FOR SIX ELEMENT FURNACES FOR SEVEN ELEMENT FURNACES COMBINATION Fan and Heater Loads COMBINATION Fan and Heater Loads TWO-STAGE Room Thermostat Option After 3rd Element TWO-STAGE Room Thermostat Option After 3rd or 5th Element WIRING WIRING M5 TWO POLE TWO POLE M6 M7 M8 To 5th element ONE POLE To 6th element To W2 of 24vAC wall thermostat H H M1 M2 To fan interlock M3 M4 To 4th element H H TWO POLE TWO POLE TWO POLE M5 M6 M7 M8 To 3rd element H H To W1 of 24vAC wall thermostat M1 M2 To fan & 1st element M3 M4 To 2nd element H H To common of 24v transformer TWO POLE TWO POLE SEPARATE Fan and Heater Loads TWO-STAGE Room Thermostat Option After 2nd or 4th Element TWO POLE WIRING TWO POLE M5 M6 To 6th element H H To W2 of 24vAC wall thermostat TWO POLE M1 M2 To fan interlock M3 M4 To 5th element TWO POLE M1 M2 To fan interlock M3 M4 To 6th element H H H H M5 M6 M7 M8 To 5th element H H To W2 of 24vAC wall thermostat To common of 24v transformer M1 M2 To fan interlock M3 M4 To 4th element H H M5 M6 M7 M8 To 3rd element H H To W1 of 24vAC wall thermostat To common of 24v transformer M1 M2 To fan & 1st element M3 M4 To 2nd element H H TWO-STAGE Room Thermostat Option After 3rd or 5th Element WIRING M5 M6 To common of 24v transformer M7 M8 To 4th element H H To W2 of 24vAC wall thermostat M1 M2 To fan interlock M3 M4 To 3rd element H H TWO POLE TWO POLE M5 M6 To 6th element M7 M8 To 7th element H H M1 M2 To fan interlock M3 M4 To 5th element H H To W2 of 24vAC wall thermostat (Two Timings) 24A34-6 M5 M6 M7 M8 To 2nd element H H To W1 of 24vAC wall thermostat To common of 24v transformer M1 M2 To fan M3 M4 To 1st element H H TWO POLE TWO POLE M5 M6 To common of 24v transformer M7 M8 To 4th element H H M1 M2 To fan interlock M3 M4 To 3rd element H H To W2 of 24vAC wall thermostat (Two Timings) 24A34-6 (Two Timings) 24A34-6 TWO POLE DOTTED LINE BETWEEN "H" TERMINAL IS A FACTORY-INSTALLED JUMPER TWO POLE M5 M6 M7 M8 To 2nd element H H To W1 of 24vAC wall thermostat White-Rodgers is a division of Emerson Electric Co. www.white-rodgers.com www.emersonclimate.com To common of 24v transformer M1 M2 To fan M3 M4 To 1st element H H (Two Timings) 24A34-6 The Emerson logo is a trademark and service mark of Emerson Electric Co. To W2 of 24vAC wall thermostat SEPARATE Fan and Heater Loads (Two Timings) 24A34-6 TWO POLE H (Two Timings) 24A34-6 (Two Timings) 24A34-6 TWO POLE H (Two Timings) 24A34-6 (Two Timings) 24A34-6 ONE POLE M6 (Two Timings) 24A34-5 (Two Timings) 24A34-6 TWO POLE To 7th element M5 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: White-Rodgers: 24A34-3 24A34-2 24A34-4 24A34-1 24A34-6 24A34-5