Armstrong World Industries 122, 302, 242, 203, 182 manual Sequence of Operation, HWC123,183,243,303

SRM-HW/HWC 2/99

Service Reference Manual SEQUENCE OF OPERATIONS

2-1

Section 2 - Sequence of Operation

HWC123,183,243,303	2-4
Simplified Sequence	2-5
Detailed Sequence	2-6
POWER	2-6
CALL FOR HEAT	2-6
LIMIT/ROLLOUT OPENS	2-7
PRESSURE SWITCH OPENS (BLOCKED FLUE)	2-7
FAILED FLAME SENSE/TRIAL FOR IGNITION	2-8
CALL FOR COOLING	2-8
FAN ON	2-9

HW (Heating Only)

(w/UTEC 1097 Spark Ignition System) 2-10

Simplified Sequence	2-11
Detailed Sequence	2-12
POWER	2-12
CALL FOR HEAT	2-12
LIMIT/ROLLOUT OPENS	2-13
PRESSURE SWITCH OPENS (BLOCKED FLUE) ...	2-13
FAILED FLAME SENSE/TRIAL FOR IGNITION	2-14
FAN ON	2-14

HWC122,182,242,302

(w/Fenwal 2461D Ignition Control) ..... 2-16

Simplified Sequence	2-17
Detailed Sequence	2-18
POWER	2-18
CALL FOR HEAT	2-18
LIMIT OPENS	2-19
PRESSURE SWITCH OPENS (BLOCKED FLUE) ...	2-19
ROLLOUT SWITCH ACTIVATED	2-19
CALL FOR COOLING	2-19
FAN ON	2-20

HW (Heating Only)

(w/Fenwal 2461D Ignition Control) ..... 2-22

Simplified Sequence	2-23
Detailed Sequence	2-24
POWER	2-24
CALL FOR HEAT	2-24
LIMIT OPENS	2-25
PRESSURE SWITCH OPENS (BLOCKED FLUE) ...	2-25
ROLLOUT SWITCH ACTIVATED	2-25