Utica Boilers MGB Series II/MGC Series インストール手順

24

Module continuously monitors boiler water temperature and 

fires or shuts off burner based on this temperature data.

When “Call for Heat” occurs, control enables circulator 

and monitors boiler water temperature to determine 

whether thermostat can be satisfied without firing 

burners.  

Control determines burner operation is required, 

module proceeds to start burner (see state codes list) 

and heats water in boiler until setpoint temperature is 

achieved or thermostat is satisfied. . 

Burner is de-activated, ignition module completes 

heating cycle, returns to idle and waits for temperature 

to drop again. 

Circulator is turned on throughout “Call for Heat.”

1

Idle

Standby - no call for heat

Circulator

Heat request present. Boiler temperature sufficiently high to run circulator pump 

only.

4

Pre-purge

System is purging before ignition trial; includes Pilot Valve circuit diagnostics.

6

Spark

System sparking.  Flame is not present up to 13 seconds

7

Flame stabilization

Flame signal is being established.  Variation in signal is allowed during this state, 

flame must be stable at end of period

8

Running

System is running.  Flame signal must be present.

9

Post-Purge

System is purging at end of call for heat

10

Retry Recycle Delay

Successful ignition was not detected, and delay is called before retry.
Flame signal was lost during state 7 or 8, and delay is called before retry (32 

second delay)

13

Soft lock-out

Soft lockout duration is one hour, may override with manual reset.

14

Hard lock-out

Manual reset is required for hard lockout

15

Wait for limit to close

Possible thermostat call for heat; limit switch is open.

16

Flame out of sequence

Flame signal sensed before trial for ignition.  Appropriate alarm is sent. 
OR
Flame signal sensed out of sequence during post purge.  Appropriate alarm is 

sent.                       OR
Flame signal present when not expected.  Appropriate alarm is sent.

17

Pilot valve diagnostics

Pilot valve circuitry diagnostics during pre-purge.

Current leakage detection Self check performed at start up, again at beginning of heat cycle, and during 

“Wait for Recovery “ State.

Wait for recovery

Self check performed at start up, again at beginning of heat cycle, and during 

“Wait for Recovery “ State

18

Wait for damper to open

Control has signaled damper/pressure switch 

to close, and is waiting for completion.                                                                                                     

If damper/pressure switch does not close within 60 seconds, control goes to 

State 20.

19

Wait for damper to close

Damper is closed and control waits for damper to open. 

Checked at beginning of heat cycle before opening damper.                                                                   

If damper does not open in 60 seconds, control goes to State 21.

20

Wait for damper to open            

(Failed close)

Damper has not opened (end swich not closed) at beginning of heat cycle.   

Alarm message is sent, control is NOT in lockout.

21

Wait for damper to close              

(Failed open)

Damper has not closed despite actuator de-energized.                                 

Alarm message is sent, control is NOT in lockout.