S9200U Installation Guide

S9200U1000 UNIVERSAL HOT SURFACE IGNITION INTEGRATED FURNACE CONTROL
15 69-2075EF—05
Fan Mode
In fan mode operation:
— If the S9200U1000 is not currently servicing
another circulator request, the circulator ener-
gizes at the heat speed when R/2 is shorted to
G and de-energizes when the request is
removed. G functionality can also be received
as an EnviraCOM™ message.
— If the S9200U1000 is servicing a fan request
and a call for cool occurs, the circulator
switches to the cool speed after the Cool Fan
On Delay.
— If the S9200U1000 is servicing a fan request
and a call for heat occurs, the circulator
remains energized at the heat speed.
Refer to Fig. 11 on page 19 for the control sequence
diagram.
Humidity Control
The line voltage humidifier output energizes anytime
the inducer energizes.
Electronic Air Cleaner
The line voltage EAC output energizes anytime the
circulator is energized.
II. CHECK SAFETY SHUTOFF
OPERATION
1. Shut off the gas supply at the manual gas valve
ahead of the appliance.
2. Set the thermostat to call for heat. System
should operate as indicated in Fig. 9 on page 18.
3. Following lockout, open the manual gas valve
and make sure no gas is flowing to the burner.
Error Conditions
The following section lists the S9200U1000 operating
sequence for the stated error conditions.
Main Valve Sensing
The S9200U1000 monitors the valve output during
the following conditions:
— Idle Mode
— Non-fault related states of Ignition sequence
— States related to the pressure switch fault
— When limit switch is open and inducer is no
longer running, up to 180 seconds following
the limit switch opening
In other conditions/states, main valve feedback is not
monitored.
MAIN VALVE FEEDBACK PROCESSING
If the inducer is off or on while the pressure switch is
still open, and voltage is detected on the valve for
longer than the fault debouncing time (miswire):
— All outputs are turned off except for the
inducer, which is kept energized.
— The circulator energizes at the heat speed.
— If a call for cool occurs, the control energizes
the circulator at cool speed after the appropri-
ate delay.
— An error code flashes indicating there is a hard-
ware malfunction. See Table 12 on page 21.
— An EnviraCOM™ alarm is active and sent on the
bus. See Table 14 on page 23.
If voltage is no longer detected on the valve for more
than the fault debouncing time:
— If the number of detected gas valve
welded/miswire conditions have not reached 5
(since last power-up), the S9200U1000 pro-
ceeds to Soft Lockout. The S9200U1000
remains in Soft Lockout for the Auto Restart
Delay.
— If the number of detected gas valve
welded/miswire conditions have reached 5
(since last power-up), the S9200U1000 enters
Hard Lockout, where it remains until power
reset.
An EnviraCOM™ alarm indicating that manual
reset is needed is active and sent on the bus.
See Table 14 on page 23.
If the inducer is energized or the pressure switch is
closed and the inducer is not energized (pressure
switch is stuck closed) and the main valve relay
contacts are sensed closed even though the relay is
not energized (welded contacts):
— An error code flashes indicating there is a hard-
ware malfunction. See Table 12 on page 21.
— An EnviraCOM™ alarm is active and sent on the
bus. See Table 14 on page 23.
— The inducer immediately switches off in an
attempt to open the pressure switch. If, after 5
seconds, flame is sensed or voltage is still
sensed on the main valve, the S9200U1000
energizes the inducer and circulator on heat
speed.
If flame is not sensed and voltage on the main valve is
no longer detected:
— The S9200U1000 proceeds to Soft Lockout if
the number of detected gas valve welded/
miss-wire conditions have not reached 5 (since
last power-up). The S9200U1000 remains in
Soft Lockout for the Auto Restart Delay period.
Otherwise, the S9200U1000 will enter Hard
Lockout where it will remain until power is
reset.
If voltage is not detected on the valve for longer than
the fault debouncing time during a period when the
valve is to be energized (contacts failed to make):
— the S9200U1000 proceeds as if flame is not
sensed. If Soft Lockout is entered due to this
condition:
• An error code flashes indicating failed
hardware. See Table 12 on page 21.
• An EnviraCOM™ alarm is active and sent on
the bus. See Table 14 on page 23.
Flame Out of Sequence
The S9200U1000 does not take action on flame
sensed in Idle Mode when there is no call for heat
present.
If the S9200U1000 is servicing a call for heat and
flame is sensed when it is not expected to be present,
the ignition and fan sequences are not allowed to
progress and the S9200U1000 stays in its current
state. The exception is Igniter Warm-up, where the
S9200U1000 proceeds to Prepurge.
If the sensed flame goes away before the False Flame
Recognition Period, the ignition sequence proceeds as
normal.