Wiring - Crown Boiler BWF Series Installation Instructions Manual

9

Wiring

!
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 (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.
109836-01 - 04/20
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 in the boiler vestibule. 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:
a. Heating Circulator - Pumps water upon a
call for heat (CH) from a heating thermostat
connected to the leads shown in Figure 9.2 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 Section 11 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 9.2
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 (outside walls,
walls adjacent to unheated areas, locations
subject to drafts). Provide Class II circuit
between thermostat (or zone controls) and
boiler.
b. DHW Thermostat - If used, connect to a 24VAC
domestic hot water thermostat or 2nd space
heating thermostat.
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