Copper-fin II/IIE Boiler and Water Heater Service Manual

1 Service (continued)

Sequence of operation

Table 1A_Sequence of Operation - Space Heating and DHW

OPERATION

DISPLAY

 

 

1. The manual reset high limit must be closed before any

HTR: Standby

action will take place.

OUT: 123.8F(129)

 

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

pumps (system and boiler pumps for space heating; DHW OUT: 123.8F(129) 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.

HTR: Standby

• If the air pressure switch is open, the prepurge cycle then

begins by starting the combustion blower. Once started,

OUT: 123.8F(129)

the air pressure switch must close.

 

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

HTR: PREPURGE

 

the hot surface igniter (HSI) is energized. The HSI is heated

 

for at least 20 seconds.

 

OUT: 123.9F(129)

5.

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

HTR: IGNITION

 

opening of the gas valve.

 

OUT: 123.9F(129)

 

 

 

6.

If the SMART SYSTEM control does not sense flame, then

HTR: POSTPURGE, PREPURGE

 

it will lock out.

 

OUT: 123.9F(129)

 

 

 

 

7.

If the SMART SYSTEM control senses

flame,

HTR: RUN STG: 1

 

it will fire the burner to maintain the setpoint.

The

 

stages will fire as required to hold the actual temperature at

OUT: 124.8F(129)

 

the setpoint.

 

 

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 HTR: DHW STG 123

divert the hot water away from the heating zone(s) and send OUT: 177.8(180) it to the DHW tank instead. The control will then fire the

stages to maintain the outlet temperature to the DHW boiler setpoint.

9

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Lochinvar 402, 2072 service manual Sequence of operation, OUT 123.8F129

402, 2072 specifications

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