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LAARS Mini-Combo id MCH - Install and Operating Manual User Manual

Page 7

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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