PEERLESS PUREFIRE PFW-199, Installation, Operation & Maintenance Manual, Page: 31 / 81

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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 absence of such local codes, the PureFire
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, pump 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 wiring connections for the
PFW-199, PFW-210 and PFW-399 boilers.
a. Terminals 1-10 on the left side are for low voltage
customer connections to the DHW sensor or
thermostat contacts, system sensors and low water
cutoff contacts. The DHW sensor (54157) is included
and the system sensor (54156) is optional. 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.
d. Terminals 15 & 16 are not yet active.
e. Terminals 17 through 26 on the right side are for
line voltage customer connections to a 3-way
valve and DHW pumps; voltage supply, and low
water cutoff (LWCO) power output.
f. Terminals 27 through 30 are a ground bus for any
line voltage ground connections.
g. Terminals 31 & 32 are not yet active.
4. Note that the service switch does not disconnect
power to the convenience outlet.
C. INTERNAL WIRING
Figure 7.3 shows the complete boiler wiring schematic for
Infinite Energy boilers. The following is a list of internal
wiring components.
1. User Interface : The user interface is attached to the
front of the electrical junction box and is accessible by
removing the tinted lens on the front of the boiler.
This interface allows users and installers to
communicate with the control.
2. Supply/Return Sensors : These thermistors located on
the left header provide supply (boiler outlet) and return
(boiler inlet) temperature information to the control.
Be sure to only use a 12 k
Ω
thermistor for this boiler.
3. Limit Switch : This component is located on the left
header and is differentiated from the sensors by a red
Molex
®
connector. This is a high temperature limit
switch that, when used in combination with the Argus
integrated primary control, is listed in accordance with
the UL353 standard for Limit Controls. It will prevent
the boiler from operating if the supply water
temperature reaches a temperature above 195°F
(91°C). Once tripped, the boiler requires a manual
reset at the boiler display interface. Be sure to only
use the Infinite Energy limit switch for this boiler.
4. Flue Sensor : This thermistor provides flue
temperature information to the control. It is located in
the vent connection inside the appliance jacket.
5. Condensate Drain Float Switch : This switch is
mounted in the condensate collector below the heat
exchanger in the rear of the cabinet.
7. ELECTRICAL CONNECTIONS
Figure 7.1: Electrical Terminal Access
ELECTRICAL CONNECTIONS
The maximum pump/3-way valve load is 10 amps. If
the load on terminals 17 & 18 or terminals 21 & 22 is
greater than 10 amps, install isolation relays.
CAUTION
DO NOT Apply line voltage power to terminals 9 & 10.
If a jumper is included in the low water cutoff device
to supply power to the contacts, it must be removed
before powering the boiler. Failure to do so may
cause damage to the boiler.
CAUTION