Weil-McLain Standing Pilot Cast Iron Gas Boiler CGA25SPDN User Manual

Part Number 550-101-009/0107

37

 

Follow all procedures given in this manual and operating 
instructions when operating the boiler. Failure to do so 
could result in severe personal injury, death or substantial 
property damage.

1. 

With no call for heat, the vent damper and circulator are de-energized. 

.O

2. 

(thermostat circuit closes):  

A

damper drives open. When vent damper end switch makes circuit, igni-
tion control begins pilot ignition attempt.

b.  Ignition control checks for false flame signal:  If ignition control senses 

pilot signal when no pilot gas should be present, control will lockout, 
requiring reset procedure as given in

3. 

gas valve. 

a.  If pilot does light and control module senses flame current, spark 

generator is turned off and main valve opens.

b.  If pilot does not light within 15 seconds, pilot valve is closed and 

SPARK

4. 

A

current. If signal is lost, main valve closes, 
spark generator activates and sequence 
returns to step 4.

b.  If power is interrupted, control system 

shuts off pilot and main gas valves and 
restarts at step 1 when power is restored.

c.  In the event the limit control shuts down 

the boiler — The control module closes 
the main gas valve, but keeps the circula-
tor operating and the vent damper open.

5. 

 (thermostat circuit opens) 

ˆ



7.  Thermostat anticipator setting: Set thermostat 

heat anticipator as instructed in

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