Crown Boiler 16H-340, Installation Instructions Manual

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29
E.
MegaStor Water Heater (if used). May be used with
Intermittent Circulation only.
Refer to MegaStor Installation, Operating and
Service Instructions for wiring, piping and
additional information.
F.
Vent Damper Sequence of Operation. See Figure 26
for schematic wiring diagram (16H-340 - 16H-505).
1. The Vent Damper is continuously powered at
Terminal 1.
2. When there is a call for heat, the damper relay coil
is energized through Terminal 5 if all limits ahead of
the damper are satisfied.
3. The relay coil closes contacts which energize the
damper motor, causing the damper to open.
4. 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.
5. When the call for heat is satisfied, 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).
G.
Sequence of Operation and Wiring. Refer to Table
10 for the appropriate control system.
H.
Optional Low-Water Cut-Off Wiring. See Figures 42
through 44.
Table 9: Heat Anticipator Settings
Control System
Heat Anticipator Setting*
Intermittent Circulation
24V Electronic Ignition 0.3
* If room is heated above thermostat temperature setting, reduce
heat anticipator setting by 0.1 or 0.2 amps. If boiler short cycles
without room reaching desired temperature, increase heat
anticipator by 0.1 or 0.2 amps.