PEERLESS PF-50 Installation, Operation & Maintenance Manual page 53

5. Setting up Multiple Boiler Operation:
a. Setting the Boiler Address:
• Press the "Menu" and "Select" keys
• Use the "
• Pressing "Select" will cause the Boiler Address
• The master boiler will be designated as Boiler
• All dependent boilers must have sequential boiler
Table 8.10: Cascade Addresses and Sensor Functions
Boiler Cascade
Operation Address
Stand-alone
Boiler
Boiler #1
Master
Boiler #2
Dependent
Boiler #3
Dependent
Boiler #16
Dependent
• Once a boiler is designated as a dependent
• The master boiler will display the system
• By pressing the "
b. Connecting the Cascade Links – PF-50 through
PF-140.
• Remove the User Interface Display from the
• There will be two sets of terminals on the sub-
• Attach 2 wires to the second set of terminals
• For the Master Boiler only, slide the
• For all dependent boilers, the switch should
• Re-assemble the User Interface Display and
• All of these wires are to be connected to the
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simultaneously for 5 seconds to enter the
Installer Menu.
M
" key to scroll down to "Cascade
Settings" on the menu.
M
value to blink. Use the " " or "L" key to
change the value.
Address: 1.
address settings as shown on the following table.
System Outdoor
Sensor Sensor
Not
0 Active
Active
1 Active Active
Not Not
2
Active Active
Not Not
3
Active Active
Not Not
16
Active Active
boiler, the display will show the individual
boiler supply temperature and its status.
temperature and the overall status of the
cascade system.
M
" or "L" key the operator
can view the master boiler status.
boiler by pressing the tab on bottom edge and
rotating it outward and upward as shown in
Figure 8.10.
base still attached to the boiler. The first set
will have wires attaching the display to the
Main Control board.
on each boiler to be connected.
switch lever toward the center of the
panel to the "ON" position.
remain in the "OFF" position toward the side
of the printed circuit board.
connect wires to each boiler in the system.
Master Boiler as shown in Figure 8.11.
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BOILER CONTROL: INTERNAL WIRING & OPERATION
DHW
Sensor
Active
Figure 8.10: Cascade Link Connection & Switch Setting
Active
Not
c. Connecting the Cascade Links – PF-210 & PF-399.
Active
Not • Remove the User Interface Display from the
Active
• Slide the Master Switch Lever toward the center
Not
Active
• Re-attach the User Interface Display.
• Connect wires from terminals #11 & #12
6. Cascade Operation:
a. When a call for Central Heat (CH) or Domestic
Hot Water (DHW) is present, the Master boiler
chooses which boiler will lead based on the
Cascade Rotation Interval.
b. Before starting the Lead boiler, the Master control
will first check to be sure that the System
temperature is lower than the System Setpoint +
Stop Boiler Differential.
c. After a Trial For Ignition (TFI), the lead boiler will
modulate its input rate to meet the heat demand.
d. Any time that a boiler is started the Cascade Start
Delay Time will be initiated and no boiler will be
allowed to start before this time elapses. This is to
allow time for the system to stabilize before
bringing on an additional boiler.
e. After the delay time has elapsed, one of the
following conditions must be met before starting
the next boiler:
• The System Temperature must be lower than
• The input rate of all boilers operating must be
To cascade PF-50 and PF-80
models, display must include
On/Off switch and sub-base must
include dual terminal blocks.
Master boiler only.
of the printed circuit board. The Master Switch
Lever is not marked with "ON" or "OFF" but
the switch is in the "ON" position when it is
moved to the left as viewed from the back of the
display. This position is shown in Figure 8.10.
between all boilers in the system.
the Set Point minus the Cascade Start Boiler
Differential temperature, or
higher than the Next Boiler Start Rate.
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