Sequence Of Operation - PEERLESS Pinnacle PI-399 Installation And Operation Manual

4. Wire the burner service switch in the hot line to the
boiler as shown in Figure 6.1.
5. Make sure to maintain correct polarity on the incoming
power supply wires. If polarity is reversed, the boiler
control will not sense the main burner flame.
6. Connect the ground wire from the incoming power
supply to the green ground screw in the junction
box. Also, the boiler ground should be connected to
this screw.
7. Figure 6.1 shows connections to boiler circulator.
a) The maximum current load for the circulator
circuit is 4.0 amperes.
b) For loads greater than 4.0 amps, isolate the
circulator using a switching relay.
c) An example of this wiring using a Honeywell
R845A relay is shown in Figure 6.2
8. The thermostat connections are shown in Figure 6.1
or 6.2. The setting for the thermostat anticipator is
0.56 amps.
9. The boiler control board is shown in Figure 6.3.
10. Factory wiring of all controls and safety devices are
shown in Figure 6.4.
Figure 6.2
B. SEQUENCE OF OPERATION
1. System Power-Up:
a) When power is first applied to the boiler, the
control will initially run through a self-diagnostic
routine. The interface unit shows the system
supply temperature.
b) Next, it will power the combustion air fan for a 10
second purge cycle.
c) Finally the combustion air shuts down and if there
is no call for heat the control board enters a
standby mode.
2. Heating Cycle:
a) When the thermostat calls for heat (closing the
contact between the two gray [TSTAT] wires) and
the boiler control senses a supply temperature
lower than the set point by more than the
differential, the boiler initiates a heating cycle.
b) The control then powers the combustion air fan
at the speed prescribed for the particular boiler
model and performs a 6 second pre-purge of the
combustion chamber.
c) 0.5 second before the pre-purge is complete
power is applied to the spark igniter.
ELECTRICAL
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