INSTALLATION INSTRUCTIONS
69-2012-01
SV9541, SV9641 SmartValve™
System Controls
APPLICATION
The SV9541 and SV9641 SmartValve™ System Controls
combine gas flow control and electronic intermittent
pilot sequencing functions into a single unit. The Q3450
or Q3480 Pilot hardware supplies the low voltage igniter,
flame sensor and pilot burner. These ignition system
controls provide all gas ignition safety functions by
controlling gas flow, ignition source, and a 120 Vac or
240 Vac combustion air blower. The controls also
monitor the appliance airflow proving switch and limit
string to assure proper appliance operation, and provide
prepurge, postpurge, and timed trial for pilot ignition
with 100 percent shutoff and continuous retry. A
diagnostic LED indicates system status.
These controls communicate directly with an electronic
fan timer (ST9160 Electronic Fan Timer for single stage
applications; ST9162 Electronic Fan Timer for two-stage
applications) in typical forced warm air furnace
applications. They also interface with the 208907
Terminal Board, providing compatibility with power
stealing thermostats. Or, they directly interface with the
appropriate power supplies and a system thermostat for
additional appliance applications. When controlled
directly by a thermostat, these controls do not provide a
postpurge function, because power to the control is
removed when the thermostat call for heat ends.
The SV9541 and SV9641 Systems are 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 determined by the appliance
manufacturer.
SmartValve™ System controls are available in a range of
valve capacities, see Table 1. (Table 2 provides gas
capacity conversion factors.) The suffix letter indicates
temperature range and regulator type, see Table 3.
a
Capacity based on 1000 Btu/ft
3
, 0.64 sp gr natural gas at 1 in. wc pressure drop (37.3 MJ/m
3
, 0.6 sp gr natural gas
at 0.25 kPa pressure drop).
b
Capacity is reduced by 5 percent when using an outlet screen.
c
Valves are guaranteed at only 77 percent of the rating.
d
Minimum regulation for LP gas is 40,000 Btuh.
Table 1. Valve Capacity
a
.
Model
Size
(Inlet x
Outlet) (in.)
AGA Certified Capacity for
Natural Gas
AGA Certified Minimum
Regulation for Natural Gas
AGA Certified Maximum
Regulation for Natural Gas
ft3/hr
m3/hr
ft3/hr
m3/hr
ft3/hr
m3/hr
SV9541
1/2 x 1/2
150
4.2
20
d
0.6
200
5.7
SV9641
b,c
3/4 x 3/4
300
8.5
415
11.8
Table 2. Gas Capacity Conversion Factor.
Gas
Specific Gravity
Multiply Listed
Capacities By
Manufactured
0.60
0.516
Mixed
0.70
0.765
Propane
1.53
1.62
Table 3. Model Number Suffix Letter Designation.
Model No.
Suffix Letter
Ambient
Temperature
Range
Pressure
Regulator Type
M
-40°F to 175°F
(-40°C to 79°C)
Standard
Q
Two-stage
