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17.3 seqUenCe of opeRaTIon
1. Room temperature drops causing the room thermostat call for first stage heat by connecting “W1” to “R”.
The control verifies the limit switch is closed and both low and high pressure switches are open. The
control energizes the exhauster motor on high speed and waits for the low pressure switch to close. The
exhauster remains on high speed and begins a 15 second pre-purge period. The high pressure switch is
ignored. If the low pressure switch does not close within 60 seconds, the control will flash “2” on the Red
Status lED, and de-energize the exhauster for 60 minutes.
2. When the 15 second pre-purge time has elapsed, the control energizes the hSI output for a 5 second
warm-up period (10 seconds on retries). The control energizes the low main gas valve. 4 seconds after the
gas is energized, the control de-energizes the hSI output and leaves the gas energized another 1 second
for flame proving. If flame is present at the end of trial for ignition time, the control leaves the gas valve
energized, exhauster on high speed, and begins heat blower on delay. The control always ignites on high
exhauster/low gas and ignores second stage call for heat until low fire is established for 15 seconds.
3. blower on delay time begins when the gas valve is energized. The control provides the ECm (Electronical-
ly Commutated motor) low heat speed signal when flame is proven, and starts a 30 second blower delay
before full capacity blower level.
4. When there is a demand for 2nd stage heat from thermostat W2 or automatic staging, the control changes
the exhauster from low to high speed. When high pressure switch closes, the control changes indoor blow-
er speed from low heat to high heat and energizes high gas output. If the high pressure switch is open
the green lED will flash. If the high pressure switch is closed the green lED will be on. high gas valve
drops out while high pressure switch is open because it is directly in series with the high pressure switch.
5. When the thermostat W2 call ends and W1 remains (two stage thermostat), the control de-energizes the
high gas output and immediately changes exhauster speed from high to low. With the thermostat heat-
ing contacts open (single stage thermostat), the flames extinguish immediately and the exhauster blower
stops after a 5 second post purge time.
6. blower off delay is handled by the ECm (Electronically Commutated motor). The control de-energizes the
ECm heat signal when the gas valve de-energizes, and starts a programmed delay period.
IN THE EvENT OF FLAME FAILURE:
If flame is lost, the control de-energizes the gas valve within 2 seconds, switches the exhauster motor to high
speed (if not already on high), and begins timing the inter-purge delay. The indoor blower motor will be ener-
gized and/or remain energized on heat speed for the programmed delay off time. When the inter-purge delay
is over, the control will re-cycle up to 5 flame losses (4 re-cycles) within a single call for heat before going into
lockout. The control flashes “8” on the Red lED if lockout is due to too many flame dropouts (1 hour lockout).
17.4 pRoGRaMMable TheRMosTaT (opTIon)
The 9600 Series furnace has an optional programmable two stage Napoleon® Elite Thermostat. For instruction
on how to operate and program this unit, please refer to the manual and installation instructions provided with
the Napoleon® Elite Thermostat kit.
