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13
2. Turn the thermostat or controller up to call for heat
and check that the vent damper indicator points to
the open position, as shown in Fig. 11.
3. Turn the thermostat or controller down again and
check that the vent damper position indicator
returns to the closed position.
The vent damper must be inspected at least once
a year by a trained, experienced service techni-
cian. The name of the person who originally
installed your vent damper is shown on the instal-
lation label. Damper must be in open position
when boiler main burners are operating.
Flair Damper
NOTE: To place vent damper in the open position to
allow burner operation: Turn the power off. Turn the
damper blade to fully open position (arrow facing
same direction as vent pipe). Turn power on.
SS
R
2
SS
2
ES
R
SC
R
1
M
2
3
41
JUMPER
GV
24 V
AC
TR
HL
L
L
12
120 VAC
60Hz
TH
1
Fig. 12: System Schematic
Abbreviation Description
M Damper Motor
R Relay
ES End Switch
SS1 N/C Safety Switch
SS2 N/O Safety Switch
TR Transformer, 120/24V
HL High Limit
GV 24V Gas Valve
TH Thermostat, Heating, Low Voltage
J Jumper
R
2
4
3
J
SS
HL
GV
1
ES
R
2
SC
M
24 V AC
R
1
SS
2
TH
Fig. 13: Ladder Diagram
Table G: Legend for Figures 12 & 13
Note: Circuit shown with damper in closed position, no call for
heat.