Instructions / Assembly

VR8245 AND VR8345 UNIVERSAL ELECTRONIC IGNITION GAS CONTROLS
11 69-2013—02
a
Low Fire setting range for VR8304Q 1/2 in. by 1/2 in. and 1/2 in. by 3.4 in. is 1.5 to 3.0 in. wc.
a
Low Fire setting range for VR8304Q 1/2 in. by 1/2 in. and 1/2 in. by 3.4 in. is 0.37 to 0.75 kPa.
Check Safety Shutdown
Performance
WARNING
FIRE OR EXPLOSION HAZARD
CAN CAUSE PROPERTY DAMAGE, SEVERE
INJURY, OR DEATH
Perform the safety shutdown test any time work is
done on a gas system.
NOTES: Read steps 1 through 7 below before starting
and compare to the safety shutdown or safety
lockout tests recommended for the intermittent
pilot (IP), hot surface (HSI) or direct spark (DSI)
module. When different, use the procedure rec-
ommended for the module.
1. Turn off gas supply.
2. Set the thermostat or controller above room
temperature to call for heat.
3. • Intermittent Pilot Ignition—Watch for an igni-
tion spark at pilot burner either immediately
or following prepurge. See ignition module
specifications.
• Hot Surface or Direct Spark Ignition —Watch
for an ignition spark or glow at hot surface
igniter either immediately or following pre-
purge. See ignition module specifications.
4. If module has timed ignition, time the length
of the igniter operation. See ignition module
specifications.
5. • Intermittent Pilot Ignition—After the module
locks out, turn on gas supply and make sure
there is no gas flow to the pilot or main
burner.
NOTE: With modules that continue spark until pilot
lights or system is shut down manually, pilot
should light when gas supply is turned on.
• Hot Surface or Direct Spark Ignition —After
the module locks out, turn on gas supply and
assure there is no gas flow to main burner.
6. Set the thermostat below room temperature
and wait at least 45 seconds to reset system.
7. Operate system through one complete cycle
to make sure all controls operate properly.
Table 6. Pressure Regulator Specification Pressures for Standard-Opening Natural Gas.
Model Type
Type of
Gas
Nominal Inlet
Pressure
Range
Factory Set Nominal Outlet
Pressure Setting Range
Step Full Rate Step Full Rate
Standard,
Slow
NAT 5.0 to 7.0 — 3.5 — 3.0 to 5.0
LP 12.0 to 14.0 — 10.0 — 8.0 to 12.0
Step NAT 5.0 to 7.0 0.9 3.5 None 0.7 to 1.7
LP 12.0 to 14.0 2.2 10.0 None 1.4 to 5.5
Two-Stage NAT 5.0 to 7.0 — 1.7 Low
3.5 High
—
0.9 to 3.0 Low
a
3.0 to 5.0 High
LP 121.0 to 14.0 — 4.9 Low
10.0 High
— 2.5 to 7.0 Low
8.0 to 11.0 High
Table 7. Pressure Regulator Specification Pressures (kPa).
Model Type
Type of
Gas
Nominal Inlet
Pressure
Range
Factory Set Nominal Outlet
Pressure Setting Range
Step Full Rate Step Full Rate
Standard,
Slow
NAT 1.2 to 1.7 — 0.9 — 0.7 to 1.2
LP 2.9 to 3.9 — 2.5 — 2.0 to 3.0
Step NAT 1.2 to 1.7 0.2 0.9 None 0.7 to 1.7
LP 2.9 to 3.9 0.5 2.5 None 1.4 to 5.5
Two-Stage NAT 1.2 to 1.7 — 0.48 Low
0.9 High
—
0.22 to 0.75 Low
a
0.75 to 1.2 High
LP 2.9 to 3.9 — 1.2 Low
2.5 High
— 0.6 to 1.8 Low
2.0 to 2.5 High