S9200U Installation Guide

S9200U1000 UNIVERSAL HOT SURFACE IGNITION INTEGRATED FURNACE CONTROL
69-2075EF—05 16
If however the sensed flame lasts longer than the
False Flame Recognition Period:
— The igniter de-energizes, the inducer ener-
gizes, and the circulator energizes at heat
speed.
— An error code flashes indicating flame is
sensed out of sequence. See Table 12 on
page 21.
— An EnviraCOM™ alarm is active and sent on the
bus. See Table 14 on page 23.
— When the sensed flame goes away, the
S9200U1000 proceeds to Postpurge, followed
by Idle Mode at which time the error code is
cleared.
Line Voltage and Earth Ground
Sensing
The line voltage circuitry is monitored for reversed
polarity in Idle Mode in all non-fault related states
except from HSI warm-up.
— If reversed polarity is detected for longer than
the fault debouncing time, all requests for heat
are ignored.
— An error code flashes indicating line voltage
polarity is reversed. See Table 12 on page 21.
— An EnviraCOM™ alarm is active and sent on the
bus. See Table 14 on page 23.
— Fan and cool requests process as normal.
Line voltage sensing requires a 120 Vac (nominal)
earth ground referenced supply with an electrical
connection between the transformer secondary and
earth ground.
Typical installations connect one side of the
secondary to the appliance chassis and the appliance
chassis to earth ground.
— If either the secondary to chassis connection,
or the chassis to earth ground connection are
missing or providing poor electrical contact,
the S9200U1000 proceeds to “Self Check
Lockout.”
— An error code flashes indicating there is no line
voltage ground present. See Table 12 on
page 21.
— An EnviraCOM™ alarm is active and sent on the
bus. See Table 14 on page 23.
— Fan and cool requests process as normal.
These two faults (Line Voltage and Earth Ground
Sensing) are combined into one detectable fault.
Weak Flame Sensing
The S9200U1000 flashes an error code if, after a
successful Trial for Ignition and while operating in
normal fire mode, the S9200U1000 senses a weak
flame signal for longer than five seconds.
— When the flame is weak, the Flame (amber)
LED flashes indicating there is a poor flame
signal. See Table 12 on page 21.
— An EnviraCOM™ alarm is active and sent on the
bus. See Table 14 on page 23.
To clear the error code, a strong flame must be sensed
for longer than five seconds or the heat demand must
be removed.
Low 24 Vac Input Sensing
If low voltage on 24 Vac input is detected, the
S9200U1000 turns off all relays, ignore all requests,
and wait until the voltage recovers.
— The S9200U1000 flashes an error code indi-
cating low 24 Vac. See Table 12 on page 21.
— An EnviraCOM™ alarm is active and sent on the
bus. See Table 14 on page 23. The alarm may
not be received due to low line voltage, but will
be stored in the alarm history.
When the voltage recovers, the S9200U1000 returns
to normal operation five seconds after the fault clears.
Bad Fuse
Once a bad fuse is detected, the S9200U1000
behaves in following manner:
— Thermostat requests that are in progress
become inactive and are finished as if they
were removed.
— All new thermostat requests are ignored.
— The S9200U1000 flashes an error code indi-
cating a bad fuse. See Table 12 on page 21.
— An EnviraCOM™ alarm is active and sent on the
bus. See Table 14 on page 23. The alarm may
not be received due to low line voltage, but will
be stored in the alarm history.
Once a good fuse is detected, the S9200U1000
returns back to normal operation through a micro
reset.
Soft Lockout
Soft Lockout is intended to prevent initiation of a new
heating cycle for a certain time after the fault related
to the heating sequence occurs. Behavior in Soft
Lockout is defined as follows:
— Thermostat heat requests are ignored.
— Thermostat cool requests are served as normal.
— Fan requests are served as normal.
— The S9200U1000 flashes a fault code identify-
ing the fault that caused transition to the Soft
Lockout. See Table 12 on page 21.
— An EnviraCOM™ alarm indicating the fault is
active and sent on the bus. See Table 14 on
page 23.
The S9200U1000 is reset from Soft Lockout by any
one of the following three ways:
— Cycling power: Removing power for longer than
10 seconds.
— Thermostat Reset: Removing the call for heat
for longer than five seconds but less than 20
seconds.
— Auto Restart: The S9200U1000 automatically
exits Soft Lockout after the Auto Restart Delay
expires if the cause of the Soft Lockout has
cleared.
Hard Lockout
Hard Lockout is intended to prevent initiation of a new
heating cycle after a serious fault related to heating
(e.g. rollout switch opening). Behavior in Hard Lockout
is defined as follows:
— Thermostat heat requests are ignored.
— Thermostat cool requests are served as normal.
— Fan requests are served as normal.
— The S9200U1000 flashes a fault code identify-
ing the fault that caused transition to the Hard
Lockout. See Table 12 on page 21.
— An EnviraCOM™ alarm indicating that manual
reset is needed is active and sent on the bus.
See Table 14 on page 23.
The S9200U1000 remains in this state until manual
power reset.