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BTR TANK TYPE HEATERS
SERVICE HANDBOOK
A.O. Smith Water Products Service Handbook
Irving, Texas ©2000 Training Department
18
BTR ELECTRICAL SEQUENCE OF OPERATION
Motor Opens
Damper
Power to Damper
#2 Interrupted
Series 110 and 111
Effikal
Series 110 and 111
Effikal
IID Module
(24V) Receives Voltage
Module (PV) Teminal
Sends 24V to Pilot Coil
Module (Spark) Sends
10,000V Spark to Pilot
Spark Stops
Damper Motor Energized
and Damper Closed
Power to Damper
Relay (4) Interupted
Themostat Opens
Main Burner Heats Tank
Module (MV)
Terminal Sends 24V
To Main Gas Coil
90 Second Trial /
5 Minute Delay Between
Trials - Continuously
Pilot Ignites and Proves Flame
Cam On Damper Blade
Closes Proving End Switch
Damper Spring Opens
Damper Blade
Motor Relay Interrupts
Power to Motor
Thermostat Closed
High Limit Closed
Tank Temperature
Motor Closes
Damper
High Limit (ECO)
Closed
Tank Temperature
Satisfied
24V Transform er
On / OFF Switch "ON"
120 Vac to Junction Box