03/19/2009
8
BI502
ELECTRICAL HOOKUP
Reference drawing BH502
1.
240 Volt Heating Power
– route and install the proper current carrying conductors from service
panel fuse or circuit breaker. See page 2 Specification Table 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 GE breakers EM5716 (two CB)/EM5717 (three CB) or Square D
breakers 5701 (two CB)/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.
Electro-Stat –
(ES-24-C-RS or ES-24-SRO) 3 wire connection required.
R to R, W to W, C to common
The Electro-Stat remote sensor can be extended as required. This is a three wire cable,
cut and splice, up to 50 feet. Use only stranded wire, shielded cable is not required.
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, please reference BH029
for special wiring requirements.
6.
Outdoor Sensor (OT)
– (EB-WO models only) the loose OT sensor bracket/probe 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.
7.
Zone Valves or Zone Pumps
– see page 2 for zone controller options.
