LAARS Mini-Combo II MCS - Install and Operating Manual - Manual (Page 13)

Mini-Combo II Page 13
Vent Damper Motor
Transformer
Figure 11. Sequence of Operation.
115 Volts Supply
Tank Stat
(common)
Domestic Demand
(N.C.)
Heating Demand
(N.O.)
Tank Pump
(energized)
High Limit
Switch
Vent Damper
Open
Power Vent
Fan Switch (optional)
Heating Pump
(energized)
Safety Limit
Switches
Main Gas Valve
(energized)
Boiler On
2.5 Sequence of Operation