Install Instructions

33
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
P
UREFIRE
®
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 top panel of
the boiler to connect supply wiring, circulator wiring
and wiring to various instruments.
2. Electrical terminals are located behind the User
Interface and can be accessed by loosening the two
nuts shown in Figure 7.1.
a. Remove one of the nuts and leave the other fully
loosened in order to leave the display interface
panel connected to the appliance.
b. The terminals can be removed by gently pulling
them away from their wired blocks. This allows
the installer to easily attach wires to the connector
before plugging it into the block.
3. Figure 7.2 shows customer connections for the PF-50,
PF-80, PF-110 and PF-140 boilers.
a. Terminals 1-10 on the left side are for low voltage
customer connections to the CH thermostat,
outdoor sensor, DHW sensor or thermostat,
system sensor and low water cutoff contacts. The
outdoor sensor is included. The DHW sensor
(54157) and the system sensor (54156) are
optional components and the low water cutoff, if
used, is to be supplied by others.
b. Terminals 11-20 on the right side are for line
voltage customer connections to DHW, CH, and
General Circulators; voltage supply, and low water
cutoff (LWCO) power output.
4. Figure 7.3 shows customer connections for the PF-210
and PF-399 boilers.
a. Terminals 1-10 on the left side are for low voltage
customer connections to the CH thermostat,
outdoor sensor, DHW sensor or thermostat,
system sensor and low water cutoff contacts. The
outdoor sensor is included. The DHW sensor
(54157) and the system sensor (54156) are
optional components and the low water cutoff, if
used, is to be supplied by others.
b. Terminals 11 & 12 on the left side are for
connecting multiple boilers together using a
cascade link which is described in Section 8.
c. Terminals 13 & 14 on the left side are dry contacts
that will close when there is a DHW call for heat.
These provide a signal to a zone controller to
prevent the CH circulators from operating during a
DHW call-for-heat.
d. Terminals 15 & 16 are not yet active.
e. Terminals 17 through 26 on the right side are for
line voltage customer connections to DHW, CH,
and General Circulators; voltage supply, and low
water cutoff (LWCO) power output.
ELECTRICAL CONNECTIONS
7. ELECTRICAL CONNECTIONS
Figure 7.1: Electrical Terminal Access
Figure 7.2: Customer Connections – PF-50, PF-80, PF-110 & PF-140