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Figure 10.1 shows the location of both the high voltage and low voltage printed circuit boards with terminal strips for field wir
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ing. Remove front door to access the PCB’s.
1) Line Voltage (120 VAC) Field Connections – See Figure 10.2 for line voltage connections. Provide a dedicated circuit
for the boiler of 15A or greater. A service switch is recommended and is required by many local codes. Locate this
switch in accordance with local codes or, in the absence of any, in a location where it can be safely accessed
in an emergency involving the boiler. All 120VAC connections to the boiler itself are made on the terminal strip on the
high voltage PCB located on the left side if the wiring compartment. 120VAC connections on the terminal strip are:
• 120VAC Hot
• 120VAC Neutral Ground
• System Pump Hot
• System Pump Neutral
• DHW Pump Hot
• DHW Pump Neutral
• Boiler Pump Hot
• Boiler Pump Neutral
X. Wiring
DANGER
Electrical Shock Hazard. Positively assure all electrical connections are unpowered before attempting
installation or service of electrical components or connections of the boiler or building. Lock out all
electrical boxes with padlock once power is turned off.
WARNING
All wiring and grounding must be done in accordance with the authority having jurisdiction
or, in the absence of such requirements, with the National Electrical Code /NFPA 70). In
Canada, all wiring and grounding must be done in accordance with the Canadian Electrical
Code, Part 1 (CSA C22.1 - latest edition).
Failure to properly wire electrical connections to the boiler may result in serious physical harm.
Electrical power may be suppled from more than one circuit. Make sure all power is off before
attempting any electrical work.
Each boiler must be protected with a properly sized over-current device.
Never jump out or make inoperative any safety or operating controls.
The wiring diagrams contained in this manual are for reference purposes only. Each boiler is shipped
with a wiring diagram attached to the front door. Refer to this diagram and the wiring diagram of any
controls used with the boiler. Read, understand and follow all wiring instructions supplied with the
controls.
NOTICE
This boiler is equipped with a listed high water temperature limit function. This limit provides boiler
shutdown in the event the boiler water temperature exceeds the set point of the limit control. Certain Local
Codes require an additional water temperature limit. If necessary, install an additional water temperature
limit such as a Honeywell L4006 Aquastat. Wire as indicated in Figure 10.3.
