Iv. Starting The Unit; A. Sequence Of Operations - Thermo Pride CDX1-100N Installation And Operation Manual

All installations and services must be performed by qualified service personnel.

IV. STARTING THE UNIT

A. SEQUENCE OF OPERATIONS

AT ANY TIME THE
GAS VALVE IS
NOT ENERGIZED
CONTINUOUS SAFE OPERATION CHECK
IF FLAME SIMULATION CONDITION PRESENT OR ROLL-OUT SWITCH
OPENS, SYSTEM ENERGIZES INDUCER FAN FOR 15 SECONDS AND
CIRCULATOR BLOWER AT HEATING SPEED UNTIL SITUATION CORRECTION
THERMOSTAT CALLS FOR
HEAT W1 OR W1 & W2,
CONTACTS CLOSE
50V61-143 CONTROL
ENERGIZED, INDUCER
ENERGIZED ON HIGH SPEED
LOW FIRE PRESSURE
SWITCHES SENSES ADEQUATE
DIFFERENTIAL PRESSURE,
CONTACTS CLOSE
PREPURGE IGNITION DELAY,
INDUCER RUNS FOR 30 SECONDS
INDUCER REDUCES
TO LOW SPEED
LOW PRESSURE SWITCH
SENSES ADEQUATE
PRESSURE DIFFERENTIAL,
CONTACTS STAY CLOSED
POWER IS APPLIED TO
THE WHITE RODGERS 768A
SILICON NITRIDE IGNITOR.
IGNITOR WARM-UP IS
20 SECONDS
29