Electrical Hookup - Electro Industries EB-MA-10 User Manual

ELECTRICAL HOOKUP

Reference drawing BH510
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 – order part number 5701.
 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 two orange wires connected to a relay on the control board represent 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-BR) 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 terminal
block marked BLU and BLU/WHT 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. Zone Valves or Zone Pumps – see page 2 for zone controller options.
09/15/2014 8 BI5096