Utica Gas-fired Boiler Operations Instructions download pdf (Page 27)

27

SERVICE HINTS

POWER ON

STAND BY

THERMOSTAT

CALLS FOR HEAT

CIRCULATOR

ENERGIZES THRU

2K1 CONTACTS

IBC SELFCHECK OF

INTERNAL CIRCUITRY

1-2 SEC

IBC

CHECKS

N.O. AIR

PRESSURE

SWITCH

CONTACTS

FALSE

POSITIVE

PROOF OF

AIRFLOW. IBC WAITS

FOR 45 SEC

FOR AIR PRESSURE

SWITCH CONTACTS

TO OPEN

CLOSED

CLOSED

DRAFT INDUCER

ENERGIZES THRU

1K1 CONTACTS

OPEN

IBC

WAITS FOR

UP TO 5 MINUTES

FOR AIR PRESSURE

SWITCH CONTACTS TO CLOSE

INDICATING FAN

SUCTION

PRESENT

CLOSED

CONTROL LOCKOUT. PURGE LIGHT

BLINKS. RESET REQUIRED. CIRCULATOR

REMAINS ENERGIZED AS LONG AS

THERMOSTAT CONTINURES TO CALL FOR

HEAT

OPEN

PURGE LIGHT IS ON. AIRFLOW PROVED.

DRAFT INDUCER RUNS FOR 15 SEC PREPURGE

OPEN

PURGE LIGHT GOES OUT. HOT SURFACE IGNITER

POWERED THRU 5K1 5K2 CONTACTS FOR 20

SEC IGNITER WARMUP. BRIGHT YELLOW

ORANGE GLOW OF THE HOT SURFACE IGNITER

CAN BE OBSERVED THRU THE OBSERVATION

PORT IN FRONT OF BOILER SECTION JUST

ABOVE IGNITER, IGNITOR LIGHT IS ON

GAS VALVE ENERGIZED THRU 3K1 AND 4K1.

CONTACTS, VALVE LIGHT IS ON.

GAS VALVE OPENS FOR 5 SEC TRIAL FOR

IGNITION. BLUE ORANGE GLOW OF THE BURNER

CAN BE SEEN THRU OBSERVATION PORT.

2 SEC INTO THE 5 SEC IGNITION TRIAL. POWER

IS TURNED OFF TO THE HOT SURFACE IGNITER.

IGNITER LIGHT IS OFF.

DURING THE LAST 2 SEC OF THE 5 SEC IGNITION

TRIAL MAIN BURNER FLAME IS PROVED BY FLAME

RECTIFICATION A FLAME SIGNAL TO IBC. GAS VALVE

REMAINS ENERGIZED. BOILER RUNS.

DOES

MAIN

BURNER PROVE

FLAME WITHIN INITIAL

TRIAL FOR

IGNITION

PERIOD?

CONTROL WILL ATTEMPT 2

ADDITTIONAL IGNITION SEQUENCES.

STARTING WITH PREPURGE.

IF MAIN BURNER DOES NOT PROVE

FLAME IN 3 TRIALS, CONTROL

LOCKOUT. VALVE/FLAME LIGHT BLINKS,

RESET IS REQUIRED. THIS PROBLEM IS A

RESULT OF NOT ESTABLISHING FLAME SIGNAL.

NORMAL

OPERATION

YES

NO

11 - DETAILED SEQUENCE OF OPERATION

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