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the boiler will automatically shut down by the control.
12. Service Switch: The service switch is located on the
front, left-hand side of the boiler. The service switch
interrupts the power to the Series PFC boiler to allow
service to be performed. The front panel must be
removed to access it.
13. Combustion Air Blower: The combustion air blower is
located directly below the electrical tray in front of the
heat exchanger. The blower has 2 connections. There
is a 120 Volt power connection (3-wire) and a low
voltage control connection (4-wire). Disconnecting the
control wires will run the blower at full speed.
14. High & Low Gas Pressure Switches: The high and
low gas pressure switches are located in front of the
heat exchanger, on the lower left-hand side. The
high gas pressure switch is located above the low gas
pressure switch. The high pressure switch is set at
13.5" wc and the low pressure switch is set at 3.5"
wc. If the gas pressure exceeds 13.5" wc or falls below
3.5" wc, the control will shut down the boiler.
15. Gas Valves: The gas valves are located in front of the
heat exchanger, on the lower right-hand side. The
gas valves are connected through special cord and
connector with the connector secured with a screw.
16. High Temperature Limit: The high temperature limit
is centered on the front plate of the heat exchanger
next to the viewer window. This component is used
to detect overheating of the burner plate, primarily
caused by broken insulation on the inside of the boiler
plate. Only use a factory provided Series PFC™ High
Limit switch/Burner Plate Switch.
NOTICE
IF the fuse blows in the boiler control, a spare fuse
(found in a holder on the control cover) can be used
as a replacement. DIAGNOSE POSSIBLE CAUSES
FOR BLOWN FUSE BEFORE REPLACING. Additional
fuses can be ordered as need from your Peerless
Boiler Distributor (Part #5562). See Figure 7.3 for
location of Boiler Control fuse and spare fuse.
ELECTRICAL CONNECTIONS & INTERNAL WIRING
17. Air Proving Switch: The air proving switch is mounted
on the inner front panel above the heat exchanger
on the right-hand side. This switch indicates that the
air inlet is not blocked and that the boiler has enough
fresh air supply for safe operation.
18. Flame Sensor: The flame sensor is located on the
lower right-hand side of the front plate of the heat
exchanger (white wire). The flame sensor uses the
principal of flame rectification to sense the burner
flame.
19. Ignition Electrode & Ignitor Ground: The ignition
electrode and ignitor ground are located on the right-
hand side of the front plate of the heat exchanger.
The ignition electrode has a black cable and the
ignitor ground is the green cable. A high voltage
charge is supplied from the control to provide spark
for lighting the burner. The ignition electrode also
provides flame sensing after the ignition spark period.
Figure 7.3: Control Fuse Location
33
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