Sequence Of Operations - COZY HEDV253A Instalación E Instrucciones De Operación

Heater in
Stand-by
Power
on to Draft
Inducer Inducer Proved
Inducer Continues to Run
Pressure Switch Closes
Proving Inducer
Heat Thermostat
Cycle
STEP #:
1) Thermostat calls for heat.
2) Draft Inducer turns on.
3) Pressure switch closes.
NOTE: If there is a malfunction during Steps 3, 5 or 6 the operation sequence will stop at that point. For Steps 5 or 6, if the
malfunction still occurs after two additional attempts, the control will lock out for one hour. For purpose of testing, the one hour
lockout can be overridden by resetting the thermostat or interrupting the electrical power.
1017952-A
HEDV SEQUENCE OF OPERATIONS
Thermostat
Calls for Heat
Pressure Spark
Switch Closes Ignition
YES
Energized
NO
YES
NO
Gas Valve
Closes Gas Flow
Satisfied
to Burners Off
4) Spark ignition begins.
5) Gas flow to burner.
6) Burner ignition proven.
7) Circulating Blower on.
8) Heater burns through heating cycle.
4 Sec.
Gas Valve
Opens Gas Flow
to Burner
One Hour Lock Out
180 Sec.
30 Sec.
Draft Blower
Inducer
Page 14
90 Sec.
Burner
Flame
YES
Proved
NO
15 Second Inter Purge
YES
3 Attempts for Ignition
NO
Heater
Off in Standby
9) Thermostat satisfied.
10) Gas flow off to burner.
11) Draft inducer off.
12) Circulating Blowers off.
13) Heater in stand-by.
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Blower
On