SA-Series Technical Manual
19
Cambridge Air Solutions
OPERATING INSTRUCTIONS
OPERATING SEQUENCE
POWER ON
1. Control transformer energized.
2. Operator must select “SUMMER VENTILATION” or
“HEATING” mode. (CE-Smart only)
SUMMER VENTILATION MODE
(CE-Smart
TM
only)
1. Mode switch in “SUMMER VENTILATION”
position.
2. TSS Controller schedule calls for
ventilation.
3. Optional motorized inlet damper opens.
4. Blower motor starts.
5. Unit continues to run until turned off.
HEATING MODE
1. Mode switch in “HEATING” position.
(CE-Smart only)
2. Thermostat or interlock calls for heat.
3. Optional motorized inlet damper opens.
4. Blower motor starts.
5. Airflow switch closes.
6. Entering air thermostat closes when inlet temperature
is below setpoint after the prepurge delay.
7. Igniter warm up timing.
8. Gas valve opens.
9. Burner lights.
10. Igniter is de-energized.
11. Low Fire Start is de-energized after 15 seconds.
12. Unit runs and modulates until operating thermostat
and/or interlock opens (heater shuts off).
13. Steps (2) through (12) repeat themselves automatically
as necessary.
