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9. HIGH ALTITUDE INSTALLATIONS
In Canada all of our Luminous heaters are
approved for altitudes zero to 2000 ft above
sea level, or 2000 ft to 4500 ft above sea level
and must be ordered as such, for either High
or Low altitude.
10. SEQUENCE OF OPERATION FOR HONEYWELL S87C DSI CONTROL
1. On A call for heat the S87C DSI Control
will check for a false flame condition /
short to ground. The module will lock out
if a false flame condition is present.
(Reset is usually done from the Thermo-
stat manually).
2. Spark (30,000 volts) is generated at the
Spark Ignition Stud, for direct ignition
of the main Burner by the single Spark
Igniter.
3. Main Gas Control Valve is powered and
OPENS lighting off the Main Burner.
4. Separate Flame Sensor, relays the pres
ence of Main Burner flame back to the
DSI Control by a rectified dc voltage
signal. (TFI period)
5. If this dc signal is a minimum of 1.5 uA
(microamps) the flame remains estab-
lished and the DSI Control discontinues
the ignition spark.
In the USA if a heater is to be installed at alti-
tudes above 2000 ft, the input must be re-
duced by 4% per 1000 ft and the orifice must
be changed. (Contact your local distributor or
Schwank for further technical information).
6. This is the 21 second T.F.I (Trial For Ig-
nition) period where flame has to be es-
tablished first, and confirmed with a mini-
mum signal strength of 1.5 microamps
back to the DSI Control. Failing this the
DSI will go into the Safety Lockout Mode
and shut down the Burner. (Reset is
manually done from the Thermostat).
7. On a loss of power the S87 allows the sys-
tem to shut down safely. Start up is initi-
ated when power is restored
8. On a loss of Main Burner flame, the
timed T.F.I. is repeated.
Safety Lock-out occurs if the flame is
not re-established within the T.F.I
period, (Reset is manually done from
the Thermostat.)
Page 10
SP-MSU4-CX-09D
Supra/Primo - 40 Manual
RD: FEB 2009
RL: 9E
BA
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