PB Heat MI User Manual download pdf (Page 19)

D. SEQUENCE OF OPERATION

1. Standing Pilot (See Figure 6.2 above)

a. The vent damper is continuously powered. On a

call for heat, limit relay R is energized, which

energizes:

●

the circulator (when used) through contact

R1, and

●

the vent damper operator through contact R2,

provided that the high-limit switch is

closed.

The vent damper operator opens the damper.

b. Once the damper is proven open, the gas valve

energizes, provided that all of the following

conditions are met:

●

the pilot thermocouple is proving flame

●

the blocked vent switch is closed, and

●

the flame rollout switch is closed.

Pilot flame is monitored through the pilot

thermocouple. If pilot flame is lost during a call

for heat, main and pilot gas flow will be shut off.

The valve must then be manually reset by

following the Lighting Instructions mounted on

the jacket panel and included in Section 7 of this

manual.

c. When the call for heat ends:

●

Limit relay R de-energizes, which opens

contacts R1 and R2.

●

The circulator shuts down.

●

The gas valve de-energizes.

●

The vent damper closes.

d. If temperature exceeds limit setting, main burners

shut off and circulator continues to operate.

ELECTRICAL

Figure 6.2: Wiring and Connection Diagram – Standing Pilot (Continuous Ignition)

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 42 43

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PB Heat MI User Manual Page 19

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