SmartValve™ System Controls
System Controls combine gas flow control and electronic
direct main burner ignition sequencing functions into a
single unit. The ignition source is 120V hot surface igniter
lighting the main burner flame. Two types of 120V
igniters may be used; see Table 1. Provides all gas
ignition safety functions by controlling gas flow, ignition
source, and a 120 Vac combustion air blower. The
control also monitors the appliance airflow proving switch
circuit and limit string to assure proper appliance
operation. The SmartValve™ System Controls provide
prepurge, postpurge and timed trial for ignition with
multiple ignition trials and auto reset from lockout.
Diagnostic LED indicates system status.
The control communicates directly with the ST9160
Electronic Fan Timer (EFT) in typical forced warm air
furnace applications. It will also interface with the 208907
Terminal Board, providing compatibility with power
stealing thermostats. Or, it directly interfaces with the
appropriate power supplies and a system thermostat for
additional appliance applications. When controlled
directly by a thermostat, the control does not provide a
postpurge function, as power to the control is removed
when the thermostat call for heat ends.
This system is suitable for a wide range of fan-assisted
combustion, gas-fired appliances including furnaces,
rooftop furnaces, boilers, unit heaters, infrared heaters,
water heaters and commercial cooking appliances. The
specific application of the SmartValve System is the
responsibility of the appliance manufacturer. See Table 2
for temperature ranges and regulator types.
See Table 4 for gas capacities.
Table 1. SmartValve™ System Controls Hot Surface Igniter Type.
Hot Surface Igniter Type
Line voltage polarity sensing models monitor the line
voltage input connection to assure line voltage polarity is
correct. If line voltage polarity is incorrect, the LED
diagnosis code will flash and the control will not respond to
the call for heat. These models also provide added LED
diagnostic codes ("6+") to indicate the reason the control
has moved to the lockout state. See Tables 9 and 10.
Equipment Damage Hazard.
Incorrect replacement will damage
The SV9510/SV9520 provides direct
replacement only. See Table 11 for a list of
models this replaces.
SV9510/SV9520: Straight through with 1/2 in. inlet and
1/2 in. outlet.
System Transformer: 40 VA minimum NEMA rated.
Voltage and Frequency:
24 Vac, 50/60 Hz.
NOTE: 50 Hz operation increases all timings by 20%.
Igniter Load: 5A maximum at 120 Vac.
Induced Draft Motor Load: 2.5A Full Load, 10A
Locked Rotor at 120 Vac.
Current at 24 Vac:
24V Thermostat: 0.25A at 24 Vac, 60 Hz.
HSI Warmup (seconds)