UTEC M1 FURNACE CONTROL SEQUENCE
Start-Up / Shut-Down
Thermostat on
call for heat
(R to W)
Event
Inducer
Igniter
Main Blower
Flame Proving
Gas Valve
Main Blower
Gas Valve
Factory Set
at 120 seconds
Elapsed Time Line - Seconds
Thermostat Off
(Break R to W)
Inducer
0
30
120
0
45
81
75
82
112
NORMAL START-UP SEQUENCE
Elapsed Time Line - Seconds
NORMAL SHUT-DOWN SEQUENCE
Normal Start-Up:
1. Close R to W circuit. The inducer motor is energized.
2. After a 45 second pre-purge the igniter is energized.
3. After a 30 second heat up the gas valve is energized (The igniter remains on during
the first 6 seconds. Gas valve will be de-energized at 7 seconds if flame is not proved.)
4. After 30 seconds the main blower is energized. (Total elapsed time 105 seconds).
Normal Shut-Down:
1. Break R to W circuit.
2. After 30 seconds the inducer is turned off.
3. After 90 seconds the main blower is turned off (120 seconds after gas valve).
St. Louis, MO
690A-0999
(Replaces 690A-0998)
Specifications and illustrations subject to change
without notice and without incurring obligations.
Printed in U.S.A. (09/99)
®
®
C
