Crown Boiler BWF Series, Supplement Manual

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2
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) .
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.
wire AdditionAl field suPPlied sAfety limits, such As low wAter cutoffs And
•
temPerAture limit devices, in series with the 120v circuit used to Power
the boiler. do not Alter the boiler’s fActory wiring when Adding An
AdditionAl limit device.
Section IX Wiring
Line Voltage (120 VAC) Field Connections 1) – See Figure 9.0 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 accor-
dance 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. 120VAC
connections are:
Ground •
120VAC Hot (Black) •
120VAC Neutral (White) •
Heating Circulator Hot (Red) •
Heating Circulator Neutral (White) •
DHW Circulator Hot (Blue) •
DHW Circulator Neutral (White) •
The use of the Circulator outputs are as follows (also refer to the Piping Section)
Heating Circulator - Pumps water upon a call for heat (CH) from a heating thermostat connected to the leads shown in a)
Figure 9.1 or from an EnviraCom thermostat.
DHW Circulator - Pumps boiler water to an indirect water heater upon a call for domestic hot water (DHW) from the b)
DHW thermostat terminals shown in Figure 9.1. This output can also be used for a second space heating zone. See Sec-
tion Xb of this manual for additional information.
Maximum circulator current draw is 5.0 FLA.
Low Voltage Connections 2) – Low voltage field connections are located as shown in Figure 9.1 and are as follows:
Heating Thermostat a) - 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.
DHW b) - If used, connect to a 24VAC domestic hot water thermostat or 2nd space heating thermostat.