Lochinvar Copper-fin II/IIE Boiler, Water Heater and Pool Heater 402 - 2072 Manuel D’Utilisation

1.  The manual reset high limit (optional) must be closed before 

any action will take place.

2. Upon a call for heat the control turns on the appropriate 

pumps (system and boiler pumps for space heating; DHW 
pump for DHW call).  The flow switch and low water cutoff 
(if equipped) must close. 

 

3.  •  The gas pressure switch(es) (if equipped) must close.
 

•  The louver proving input must close.

 

•  If the air pressure switch is open, the prepurge cycle then 
   begins by starting the combustion blower.  Once started, 
   the air pressure switch must close. 

4.  After the 15 second prepurge, the blower slows down and 

the hot surface igniter (HSI) is energized.  The HSI is heated 
for at least 20 seconds.  

5.  Once the HSI is hot, the trial for ignition begins with the 
 

opening of the gas valve.

6.  If the SMART SYSTEM control does not sense flame, then 
     it will lock out.

7. If the SMART SYSTEM control senses flame, 
   it will fire the burner to maintain the set point.  The 
     stages will fire as required to hold the actual temperature at       
       the set point.  If the boiler lights due to a space heating call for  
   heat, and the ramp delay function is active (default is 
    disabled), the stages will be held to a series of increasing 
     limits after the burner has lit.

8.  If the space heating call for heat is active, and the DHW 

thermostat closes, the control will turn on the DHW pump, 
wait 2 seconds, and then turn off the boiler pump.  This will 
divert the hot water away from the heating zone(s) and send 
it to the DHW tank instead.  The control will then fire the 
stages to maintain the outlet temperature to the DHW boiler 
set point.

 Copper-fin II/IIE Boiler, Water Heater and Pool 

Service Manual