Honeywell S9200U1000 - Page 18

S9200U1000 UNIVERSAL HOT SURFACE IGNITION INTEGRATED FURNACE CONTROL
69-2075—01 18
Fig. 10. S9200U1000 sequence - Cooling
Mode cycle.
Fig. 11. S9200U1000 sequence - Fan Mode cycle.
COOLING REQUEST
RECEIVED
2. CALL FOR COOLING
ENERGIZE COOLING
CONTACTOR
(COMPRESSOR)
ENERGIZE CIRCULATOR
(COOLING MODE)
WAIT FOR COOL FAN
ON DELAY TO EXPIRE
DE-ENERGIZE COOLING
CONTACTOR
(COMPRESSOR)
WAIT FOR COMPRESSOR
SHORT CYCLE
DELAY TO EXPIRE
DE-ENERGIZE
CIRCULATOR
COOLING
REQUEST
STILL ACTIVE?
ENERGIZE AND MAINTAIN
CIRCULATOR AT
COOLING MODE
YES
NO
M24912
2
1
THE OPERATION IN THE BLOCK IS SKIPPED WHEN A SYSTEM
WITH A CONVENTIONAL THERMOSTAT IS USED.
THE OPERATION IS PERFORMED IN SYSTEMS WITH AN ENVIRACOM™
THERMOSTAT ONLY.
2
1
1
1
WAIT FOR COOL FAN
OFF DELAY TO EXPIRE
CALL FOR FAN
3. CALL FOR FAN
CIRCULATOR ON
(HEAT SPEED)
REQUEST
FOR COOLING
RECEIVED?
DE-ENERGIZE
CIRCULATOR
NO
NO
CALL
FOR FAN
REMOVED?
YES
GO TO CALL
FOR HEAT
MAINTAIN
CIRCULATOR
SPEED
GO TO CALL
FOR COOLING
M24913
3
2
1
3
REQUEST
FOR HEAT
RECEIVED?
MAINTAIN
CIRCULATOR
SPEED
YES
NO
YES