Thermo Products chx-3 75n, 100n, 125n Iv. Starting The Unit A. Sequence Of Operations

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

IV. STARTING THE UNIT

A. SEQUENCE OF OPERATIONS

AT ANY TIME THE						CONTINUOUS SAFE OPERATION CHECK
GAS VALVE IS					IF FLAME SIMULATION CONDITION PRESENT OR ROLL-OUT SWITCH
NOT ENERGIZED					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
					50V51-843 CONTROL
					ENERGIZED, INDUCER
			ENERGIZED ON HIGH SPEED
					LOW FIRE PRESSURE
		SWITCHES SENSES ADEQUATE
				DIFFERENTIAL PRESSURE,
					CONTACTS CLOSE
			PREPURGE IGNITION DELAY,
	INDUCER RUNS FOR 15 SECONDS
					INDUCER REDUCES
					TO LOW SPEED
				LOW PRESSURE SWITCH
					SENSES ADEQUATE
				PRESSURE DIFFERENTIAL,
				CONTACTS STAY CLOSED
				POWER IS APPLIED TO
					THE WHITE RODGERS
				SILICON NITRIDE IGNITOR.
					IGNITOR WARM-UP IS
					17 SECONDS

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