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Service Reference Manual SEQUENCE OF OPERATIONS
2-1
SRM-HW/HWC 2/99
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