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A. GENERAL
This appliance is to be wired in accordance with local
codes and regulations as defined by the Authority having
jurisdiction. In the absence of such local codes, the Series
PFC
TM
boiler is to be wired in accordance with the latest
edition of the National Electrical Code, ANSI/NFPA 70.
B. CUSTOMER CONNECTIONS
1. Electrical knockouts are provided on the back panel
of the boiler to connect supply wiring, circulator wiring
and wiring to various instruments via the electrical
access channel.
2. Electrical terminals are located on the right-hand side
of the electrical tray.
3. Figure 7.4 shows customer connections for the Series
PFC
TM
boiler.
a. All
LINE
voltage connections are on the left
terminal strip, a detailed description is shown in
Table 7.1.
b. All
LOW
voltage connections are on the right
terminal strip, a detailed description is shown in
Table 7.2.
ELECTRICAL CONNECTIONS & INTERNAL WIRING
7. ELECTRICAL CONNECTIONS &
INTERNAL WIRING
HIGH TEMPERATURE
LIMIT SUPPLY SENSOR
LWCO
PROBE
Figure 7.1: Sensor Locations
Table 7.1: Line Voltage Terminal Description
Terminal Input/
Output Voltage
Description
1
L
Output
120
VDC
Alarm
Relay
120 VAC, 60Hz, output
energized when boiler enters
lockout state.
2
N
3
L1
Input
120
VAC
Control
Supply
120 VAC, 60 Hz, 1 Phase
supply from a fused disconnect
switch to power the boiler, boiler
control and combustion air
blower.
4
L2
5
L1
Input
120
VAC
Pump
Supply
120 VAC, 60 Hz, 1 Phase
supply from a fused disconnect
switch to power the boiler
circulators.
6
L2
7
L
Output
120
VAC
GEN
Pump
General Circulation Pump – Use
this output to power the GEN
(boiler) circulator.
8
N
9
L
Output
120
VAC
DHW
Pump
DHW Circulation Pump –
Use this output to power the
Domestic Hot Water (DHW)
circulator.
10
N
11
L
Output
120
VAC
CH
Pump
CH Circulation Pump – Use
this output to power the Central
Heating (CH) circulator.
12
N
Table 7.2: Low Voltage Terminal Description
Terminal
Input/
Output Voltage
Description
13
0V
Input
5
VDC
Water
Pressure
Switch
Optional dry contact for
water pressure switch.
14 Sensor
15
+5V
Input
5
VDC
Heat
Exchanger
Flow Switch
Optional dry contact
for flow switch safety.
Can also be used for
additional LWCO safety.
16 Sensor
17
GND
Output
MODBUS
For connection to
external BMS via
Modbus communication
protocol.
18
B/-
19
A/+
20
0V
% PWM
10
VDC
Pump
Speed
Optional modulating
pump control. PWM
signal output.
21
PWM
22
-
Input
0-10
VDC
Analog
0-10V
Input for 0-10Vdc boiler
control for CH mode 4
and 5.
23
+
24
Input/
Output
24
VDC
Cascade
Dependent
Wire to Terminals #26
& #27 of Managing
Boiler
25
26
Input/
Output
24
VDC
Cascade
Managing
Wire to Terminals #24
& #25 of all Dependent
Boilers
27
28
Input
5
VDC
System
Sensor
Managing boiler must
have System/Cascade
Sensor
29
30
Input
5
VDC
Outdoor
Sensor
Connection point for 12
kOhm outdoor sensor.
31
32
Input
24
VAC
DHW Sensor/
Stat
Connection point for
tank sensor or DHW
thermostat.
33
34
Input
24
VAC
CH Stat
Connection point for
CH thermostat.
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