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(see wiring diagram, Figure 65, page 59)
Part number 550-100-211/0122
– 52 –
Figure64 Field wiring overview (see Figure 65, page 59 and
Figure 66, page 60 for detailed schematic and ladder
wiring diagrams)
ELECTRICALSHOCK HAZARD — For your safety, turn o
electrical power supply at service entrance panel before making
any electrical connections to avoid possible electric shock hazard.
Failure to do so can cause severe personal injury or death.
e installation must comply with National Electrical Code and
any other national, state, provincial or local codes or regulations.
In Canada, CSA C22.1 Canadian Electrical Code Part 1, and any
local codes.
Wiring must be N.E.C. Class 1. If original wiring as supplied with
boiler must be replaced, use only type 105 °C wire or equivalent.
Boiler must be electrically grounded as required by National
Electrical Code ANSI/NFPA 70 – latest edition.
Do not use 24V from transformer to power any external devices
that are not listed in this manual.
Eight knockouts are provided in the top of the cabinet for line
and low voltage wiring. See Figure64 for locations and functions.
InstallerMUSTuseastrainrelief through jacket knockouts.
Failure to do so can cause severe personal injury, death or sub-
stantial property damage.
InstallerMUSTSEAL all electrical entrances using a sealed strain
relief or a strain relief sealed with duct seal putty or silicone.
Sealing the entrances prevents water from entering the electrical
enclosure. Failure to seal entrances could result in severe personal
injury, death or substantial property damage.
See details on the following pages for the wiring connections
outlined below:
Requiredwiringconnections
y 120VAC power to boiler; 120VAC power out to boiler cir-
culator; system supply and return temperature sensors; and
outdoor temperature sensor (unless exempt as described in
this manual).
Connectionsasneededbysystems
y ermostat, end switch or other inputs for call for heat.
y System zone circulators, valves, relays, etc.
y System circulator, when required.
y Low water cut-o (when required).
Optionalwiringconnections
y External limits; proof-of-closure interlocks (combustion air
damper, ow switch, etc.); 0–10VDC for target or modulation
control; remote alarm; additional heat demand contact; and
communication cables for boiler networking and/or building
management system interface (MODBUS).
1 120VAC knockout for power to boiler circulator terminals at
item11.
2 For wiring to P12 – Low water cuto kit (when used) wire
harness should be routed through this knockout with no
other wires. Provide strain relief and a seal at cabinet entry.
3&4 Two knockouts for low voltage wires to terminal strips at
items9 and 10 (terminal strips P10, P11, P13, P14, P15 and
P16). ese knockouts are provided with multi-hole cord
grips. Use if allowed by codes.
• ermostat, aquastat, limit device, outdoor temperature
sensor, system temperature sensor, and boiler communica-
tion wiring should be mounted through the cord grip.
• Mount cord grip to desired low voltage knockout and
secure with a locknut before passing wire through cord grip.
• Aer all wires are routed through cord grip holes and
secured to connecting terminals, hand tighten the nut on top
of the cord grip to seal any unused holes and grip the wires
tightly.
5,6,7&8 Four knockouts for 120VAC wiring to power in (at
item12) and three 120VAC outputs on terminal strip (at
item13).
9 Low voltage connection terminal strips are shipped loose
with boiler and must be plugged into receptacles on control
module.
10 Low voltage terminal strips (P4 & P5) for connection of com-
munication cables (multiple boiler applications).
11 120VAC terminal strip (P8) on Pump/Comm Board for
boiler circulator power.
12 120VAC terminal strip (T1) for boiler power supply (15-amp
breaker unless larger capacity is required for outputs con-
nected on terminal strip P2, located at item 13).
13 120VAC terminal strip (P2) for outputs to circulators or
auxiliary devices.
14 Low voltage terminal strip P7: clip jumper to wire proof-of-
closure interlocks (combustion air damper, ow switch, etc.).
220 /29 9/3 00 /39 9
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