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Figure 9: Vent Damper Schematic Wiring Diagram
Heat Anticipator in Thermostat should be set to match
the requirements of the control to which it is connected.
See Table 4. If system tends to overheat above the
thermostat's temperature setting, reduce heat anticipator
setting by .1 or .2 amps. If system tends to short cycle
without reaching desired room temperature, increase
heat anticipator setting by .1 or .2 amps.
16. INSTALL ELECTRIC WIRING in accordance with
National Electric Code or the Canadian Electrical Code
and local regulations. See Figures 11 through 16 for
applicable wiring diagram. A separate electrical circuit
must be run from the main electrical service with an
over-current device/disconnect in the circuit. A service
switch is recommended and may be required by some
local jurisdictions. When installed, the boiler must be
electrically grounded in accordance with local codes or,
in the absence of local codes, with the National
Electrical Code, ANSI/NFPA 70, and/or the CSA C22.1
Electrical Code, if an external electrical source is
utilized.
For zone valve wiring, a separate 24V transformer is
required rather than attempting to use the boiler
mounted control. Consult zone valve manufacturer for
assistance.
17. VENT DAMPER SEQUENCE OF OPERATION.
See Figure 9.
A. The Vent Damper is continuously powered at
Terminal 1.
B. When there is a call for heat, the damper relay coil is
energized through Terminal 5 if all limits ahead of
the damper are satised.
C. The relay coil closes contacts which energize the
damper motor, causing the damper to open.
D. When the damper blade reaches the fully open
position, power is sent back to the ignition circuit
through Terminal 2 and the damper motor is de-
energized.
E. When the call for heat is satised, the damper relay
coil is de-energized - closing contacts which
energize the damper motor. This causes the damper
to close. When the damper blade reaches the fully
closed position, the damper motor is de-energized.
POWER FAILURE - The damper blade will stop in
the position it was in when power failed.
(Combustion can never take place unless the damper
blade is in the fully open position.)
CAUTION
This boiler contains controls which may cause the boiler to shut down and not restart without service. If
damage due to frozen pipes is a possibility, the heating system should not be left unattended in cold weath-
er; or appropriate safeguards and alarms should be installed on the heating system to prevent damage if
the boiler is inoperative.
CAUTION
Avoid operating this boiler in an environment where saw dust, loose insulation bers, dry wall dust, etc.
are present. If boiler is operated under these conditions, the burner interior and ports must be cleaned and
inspected daily to insure proper operation.