PeerlessBoilers Peerless PureFire PFC-460, Installation, Operation & Maintenance Manual

Page: 57 / 90

55
• A DHW call results in the operation of the lead
boiler and its general pump. The DHW pump is
also energized.
• Wiring for a typical circulator zone relay is
shown in Figure 7.4.
4. Setting up Multiple Boiler Operation:
a. Setting the Boiler Address:
• Press the “Menu” and “Select” keys
simultaneously for 5 seconds to enter the
Installer Menu.
• Find screen #2, Boiler Address. Use the “
M
”
key to scroll down to “Burner Settings” on the
menu.
• Pressing “Select” will cause the Boiler Address
value to blink. Use the “
M
” or “
L
” key to
change the value.
• The master boiler will be designated as Boiler
Address: 1.
• All dependent boilers must have sequential boiler
address settings as shown on the following table.
• Once a boiler is designated as a dependent
boiler, the display will show the individual
boiler supply temperature and its status.
• The master boiler will display the system
temperature and the overall status of the
cascade system.
• By pressing the “
M
” or “
L
” key the operator
can view the master boiler status.
b. Connecting the Cascade Links – PFC-460.
• Re-attach the User Interface Display.
• Connect wires from terminals #11 & #12
between all boilers in the system.
5. 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.
Boiler
Operation
Cascade
Address
System
Sensor
Outdoor
Sensor
DHW
Sensor
Stand-alone
Boiler
0
Not
Active
Active Active
Boiler #1
Master
1 Active Active Active
Boiler #2
Dependent
2
Not
Active
Not
Active
Not
Active
Boiler #3
Dependent
3
Not
Active
Not
Active
Not
Active
➞ ➞ ➞ ➞ ➞
Boiler #16
Dependent
16
Not
Active
Not
Active
Not
Active
Table 8.33: Cascade Addresses and Sensor Functions
Figure 8.52: Interconnection of Cascade Link Wires
TAB
OPEN
OFF
DISPLAY BOARD
(BACK VIEW)
SUB-BASE
CONNECTION TO CUSTOMER
TERMINALS 11 AND 12
CONNECTION TO MAIN CONTROL
Figure 8.51: Cascade Link Connection & Switch
Setting
BOILER CONTROL: OPERATION