Product Manual

05/19/2016 9 BI514
ELECTRICAL HOOKUP
Reference drawing BH512
1. 240 Volt Heating Power – route and install the proper current carrying conductors from service
panel fuse or circuit breaker. See Table 1 – Electro-Boiler and/or product nameplate for ratings.
These models contain built-in circuit breakers and meet the requirement for local disconnect for
appliances greater than 10 kW. Connection is at the circuit breaker terminals. If using single feed
method, single feed bus Square D breakers 5701 (two CB) or 5702 (three CB) should be used.
 Only copper wire is allowed.
 CB1 is highest priority stage.
2. Grounding – copper conductor is required, size per NEC code relating to the current of each feed.
3. Circulating Pump – the terminal block (orange wires) below the circuit breakers represents a switch
closure (10-amp maximum) to operate an external circulating pump motor. Voltage for the pump
must come from a separate source.
 The pump is controlled as a direct function of the R and W input.
 If this is connected with a standby boiler, generally the assumption is series plumbing with
the single pump. In this case, the R and W function will operate the pump whether in electric
or standby mode.
 If a standby boiler installation has parallel plumbing with two pumps, field wiring and
controls will be necessary to properly operate (and typically check valve isolate) the standby
boiler self-contained pump from the system pump controlled by these two terminal screws.
4. Operating Thermostat – two types can be used. Connection is at the control board bottom.
 Standard Mechanical – connect to “R” and “W”, bottom right. Set thermostat internal heat
anticipator to 0.2.
 Floor Sensing Stat – connect to “R” and “W”, bottom right. Place slab sensor in the slab.
 If needed, can connect thermostat “C” to boiler “C
NOTE: Power robbing/power stealing thermostat – if you have a power robbing or power stealing
thermostat, you must use the resistor included with the thermostat. Place this jumper between boiler
“W” and boiler “C”. If resistor is not used, intermittent boiler operation can be expected.
Comment: If zone valve or zone pumps see appropriate sections.
5. Load Management Interrupt Control – this Electro-Boiler series has been pre-wired and designed
for an external utility load management receiver connection. The control board lower left BLU and
BLU/WHT wires represent the two contact points, extend these wires to the utility load control
device.
As shipped, this unit is only equipped for off-peak = N.C. logic. If reversed logic is required, contact
the factory for modification.
 Optional – if load management is not used, simply keep the two blue wires shorted.
 Optional – if the power company disconnects 240V for load control, contact factory for
BH029 for special wiring requirements.
6. Outdoor Sensor (OT, outdoor reset configuration EB-WX models only) – the loose OT sensor needs
to sense true outdoor temperature. Mount on an outside wall position that will represent the most
accurate outdoor temperature. If possible shade from direct sun rays.
 If you have an EB-S boiler and would like outdoor reset, order part number WFS25F.