LAARS Mini-Combo id MCH - Install and Operating Manual - Manual (Page 7)

Mini-Combo id Page 7
Figure 7. Sequence of Operation.
115 Volts Supply
Transformer
Tank Stat
(common)
Domestic Demand
(N.C.)
Heating Demand
(N.O.)
Tank Pump
(energized)
High Limit
Switch
Inducer
Energized
Fan Proving
Switch
Heating Pump
(energized)
Flame Roll-Out
Safety Switch
Main Gas Valve
(energized)
Boiler On
Sequence of Operation