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 tech- nician 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) Resistive (Non-Inductive) Motor Ratings (Inductive) VAC Watts Amps Full Load Locked Rotor Pilot Duty 120 3000 25.0 14.0A 72.0A 125 VA 240 6000 25.0 7.0A 42.0A 125 VA 480 6000 12.5 480 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 24A34-1 1 1 1-20 40-110 24A34-2 1 1 30-90 1-30 40-110 40-110 24A34-3 1 2 1-20 1-20 24A34-4 1 2 30-90 30-90 1-30 1-30 1-110 1-110 1-110 24A34-5 2 3 1-110 1-110 1-110 1-110 1-110 1-110 1-110 24A34-6 2 4 1-110 1-110 1-110 1-110 24A34-14 4 5 1-160 1-160 1-160 1-160 1-160 1-160 1-160 1-160 1-160 1-160 24A34-15 1 1 1-60 75-95 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 in- terlock should be the M / M contacts of the second or third sequencer. All M / M contacts are wired to the blower motor so that any sequencer that is energized 1 2 1 2 will keep the blower ON. PART NO. 37-4800C Replaces 37-4800B www.white-rodgers.com 1050 www.emersonclimate.com WIRING DIAGRAMS FAN DELAY OFF FOR THREE ELEMENT FURNACES WITH WIRING COMBINATION FAN & HEATER LOADS I 2 Normally close SINGLE-STAGE Room Thermostat 3 Normally open WIRING H H M5 M6 To 3rd element (One Timing) ONE POLE 24A34-15 H H To 24vAC wall thermostat To fan & 1st element M1 M2 TWO POLE M3 M4 To 2nd element FOR ONE ELEMENT FURNACES H H (Two Timings) COMBINATION Fan and Heater Loads 24A34-5 WIRING M1 M2 To 1st element & fan TWO-STAGE Room Thermostat Option ONE POLE H H To 24 VAC wall thermostat WIRING (One Timing) 24A34-1 / -2 M5 M6 TWO POLE M7 M8 To 3rd element SEPARATE Fan and Heater Loads H H To 24vAC wall thermostat WIRING M1 M2 To fan & 1st element TWO POLE M3 M4 To 2nd element M1 M2 To fan H H TWO POLE M3 M4 To 1st element H HTo 24vAC wall thermostat (Two Timings) 24A34-6 (One Timing) 24A34-3 / -4 FOR THREE ELEMENT FURNACES WITH SEPARATE FAN & HEATER LOADS FOR TWO ELEMENT FURNACES SINGLE-STAGE Room Thermostat COMBINATION Fan and Heater Loads WIRING WIRING M1 M2 To 1st element & fan M5 M6 To 2nd element TWO POLE M3 M4 To 2nd element TWO POLE To 3rd element M7 M8 H HTo 24vAC wall thermostat H H To 24vAC wall thermostat M1 M2 To fan (One Timing) 24A34-3 / -4 TWO POLE M3 M4 To 1st element H H (Two Timings) 24A34-5 SEPARATE Fan and Heater Loads WIRING M5 M6 To 2nd element or aux. contacts TWO-STAGE Room Thermostat Option ONE POLE H H WIRING M1 M2 To fan M1 M2 To fan interlock TWO POLE M3 M4 To 1st element TWO POLE M3 M4 To 3rd element H HTo 24vAC wall thermostat H HTo W2 of 24vAC wall thermostat (Two Timings) 24A34-5 (One Timing) 24A34-3 / -4 M5 M6 To common of 24v transformer TWO POLE M7 M8 To 2nd element H H To W1 of 24vAC wall thermostat M1 M2 To fan DOTTED LINE BETWEEN TERMINAL TWO POLE M3 M4 To 1st element IS A FACTORY-INSTALLED JUMPER H H (Two Timings) 24A34-6 2