6-Flame Roll-out Limit S47
-
closes the gas valve.
+
+
manual reset.
7-Combustion Air Prove Switch S18
S18 is a SPST N.O. switch which monitors combustion air
The switch closes on a negative pressure fall. This nega-
tive pressure fall and switch actuation allows the ignition
-
bustion air inducer is operating before allowing the gas
valve to open.) The combustion air prove switch is factory
set and not adjustable. The switch will automatically open
on a pressure rise (less negative pressure). S18 closes
+++
in.w.c. (24.8 + 12.4Pa)
8-Combustion Air Inducer B6
The combustion air inducer provides fresh air to the burn-
er while clearing the combustion chamber of exhaust gas-
auto-reset overload protection. Blower is supplied by var-
ious manufacturers. Ratings may vary by manufacturer.
rating plate.
All combustion air blower motors are sealed and cannot
be oiled. The blower cannot be adjusted but can be disas-
sembled for cleaning.
9-Combustion Air Motor Capacitor C3
Combustion air inducer B6 requires a run capacitor rated
10-Gas Valves GV1
is energized by the ignition control simultaneously with the
-
-
units.
HEATING SECTION COMPONENTS
(reference)
IGNITION
WIRE
J15 P15
J29
B6
COMBUSTION
AIR INDUCER
GV1 GAS
VALVE
S18 BLOWER
PROVING SWITCH
PRIMARY
LIMIT
SWITCH
A3
IGNITION
CONTROL
SENSOR
WIRE
J19
P19
S47 ROLLOUT
SWITCH
FIGURE 19
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