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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.
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.
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 11.3.
Figure 11.1 shows the locations for making both high voltage and low voltage field connections.
1) Line Voltage (120 VAC) Field Connections – Leads for the line voltage connections are located in the junction box as shown
in Figure 11.1. 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 wire nut connections,
except for the ground, which is a screw. The leads are color coded as follows:
•
120VAC Hot - Black
•
120VAC Neutral - White
•
System Pump Hot - Yellow
See Figure 11.2 for line voltage field connection wiring.
Note that the system circulator is field supplied and is the pump that, in most cases, actually circulates water through the radia-
tion. The system pump is always on when the boiler is responding to a call for space heat. Maximum recommended current
draw for the system pump is 2.0A.
82
XI. Wiring
DANGER
WARNING
NOTICE
107774-01 - 9/17
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