Wiring - Crown Boiler AWR Series Installation Instructions Manual

• 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 (ANSI/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).
• Electrical power may be supplied from more than one circuit. Disconnect electrical power to the boiler and
heating system before servicing. Positively assure that no voltage is present. Lock electrical boxes to
prevent someone from inadvertently restoring power before the heating system is safe to operate.
• Never defeat or jump out safety devices.
• Protect each boiler circuit with a properly sized over-current protection device.
• Make electrical connections carefully according to the boiler's wiring diagram and instructions. Failure to
properly wire electrical connections to the boiler may result in serious physical harm or property damage.
• Wire additional field supplied safety limits, such as low water cut-offs and temperature limit devices, so as
to break the 120V power supply to the boiler. Alternatively, some 24V safety limits can be wired in place of
the limit jumper shown in Figure 9.2. Do not alter the boilers factory wiring when adding a field supplied
limit device.
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
(P/N 106056-01) or equivalent Honeywell L4006 Aquastat. Wire as indicated in Figure 9.2.
1) Line Voltage (120 VAC) Field Connections – See Figure 9.1 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 inside the junction box on the right side of the boiler
(accessible through the cover plate on the right side jacket panel). 120VAC connections are:
• Ground
• 120VAC Hot (Black)
• 120VAC Neutral (White)
• Heating Circulator Hot (Yellow)
• Heating Circulator Neutral (White)
• DHW Circulator Hot (Red)
• DHW Circulator Neutral (White)
The use of the Circulator outputs are as follows (also refer to the Piping Section)
a) Heating Circulator - Pumps water upon a call for heat (CH) from a heating thermostat connected to the leads shown in
Figure 9.1 or from an EnviraCom thermostat.
b) DHW Circulator - Pumps boiler water to an indirect water heater upon a call for domestic hot water (DHW) from the
DHW thermostat terminals shown in Figure 9.2. This output can also be used for a second space heating zone. See Sec-
tion XI of this manual for additional information.
Maximum circulator current draw is 5.0 FLA.
2) Low Voltage Connections – Low voltage field connections are located as shown in Figure 9.3 and are as follows:
a) Heating (CH) Thermostat - Connect to a 24 volt thermostat or other "dry contacts" (such as a zone panel end switch)
that close upon a call for heat. Follow thermostat manufacturer's instructions. To insure proper thermostat operation,
avoid installation in areas of poor air circulation, hot spots (near any heat source or in direct sunlight), cold spots (out-
side walls, walls adjacent to unheated areas, locations subject to drafts). Provide Class II circuit between thermostat (or
zone controls) and boiler.
IX Wiring
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WARNING
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