System Or Water Flow; Multiple Zones & Radiant Temperatures; Zone Controller - Electro Industries EB-MX-10 Installation & Operating Instructions Manual

SYSTEM OR WATER FLOW

In order to prevent hi-limiting and assure full 20+ years parts life, the piping system/basic
plumbing/circulator pump must be arranged to provide flow greater than minimum GPM shown in Table
1. If zoned system, this applies when the smallest zone is operating.
NOTE: Since this is an automatic temperature sensing system, both sensors and the complete control
wiring are required before using or turning on this Electro-Boiler.
TABLE 1 - ELECTRO-BOILER SPECIFICATION
240 volts, 60 Hz, single phase
Model
EB-S/MX-10
EB-S/MX-15
EB-S/MX-20
MULTIPLE ZONES AND RADIANT TEMPERATURES
Same water temperature all zones – in this case the system can be setup as one pump with the water
circulated through the boiler and directly to a manifold containing the various zone valves. Although this
model series has a built-in outlet sensing and controller mechanism for staging the elements, also consider
the next section, Zone Controller. If not using zone controller, the end switches of all of the zone valves
are paralleled and directly control R and W to turn on the boiler.
Various water temperature requirements – if this is the case, a primary loop with mixing valve for the
various zone temperature requirements is necessary. Injection pump techniques can also be used.
However, usually injection pump techniques come with a controller which is designed to protect a gas
boiler from cool water return. This is simply not needed and a duplication with the temperature sensing
controller within this Electro-boiler and the injection pump controller will be of no benefit within the
operating system. The zone valve/zone pump control strategy must be wired to provide the boiler "R and
W" contact closure and the primary pump is connected to the boiler pump contacts. This assures the
primary pump is active and running whenever the boiler is turned on via contact closure on "R and W".
At least one zone must be open before turning on the primary pump/Electro-Boiler. Do not design a
system where the Electro-Boiler is supposed to operate as a "hot boiler" based upon its outlet sensor
without the primary pump circulating water, minimum 2 GPM is required.
Electro Industries' Zone Controllers – the Electro Industries' zone controller priority zone has the
ability to communicate with this TS Series boiler and it will automatically switch to a low mass high
water temperature (150 or 180) during zone 1, priority switch on, operation. With this feature the TS
boiler can automatically take care of two temperature requirements thus eliminating the need for the
technique described in the paragraph above.

ZONE CONTROLLER

This Midsize Series boiler controls the electric elements based upon water temperature independent of
flow; therefore, in theory, a staging zone controller is not required; however, there are three suggestions
or reasons why a zone controller can simplify the installation and enhance overall performance.
1. Zone wiring and troubleshooting convenience – the addition of the zone board allows for easy
terminal block and point to point wiring for each zone thermostat and each zone valve. Also there
are LED's associated with the thermostat action and the zone valve action. This greatly simplifies
wiring and future troubleshooting with a neat terminal block wiring arrangement and the onboard
LED's.
2. Prevents over control or false staging up and down when the temperature sensors are
attempting to regulate – since Electro Industries' zone controllers have staging "smarts", the
addition of the zone controller will provide smoother boiler temperature control. The zone board has
10/27/2016
Btu/h Rating Amp
34,000 10 kW 42A
51,000 15 kW 63A
68,000 20 kW 83A
2
Breakers Stages GPM
60 2
60, 30 3
60, 60 4
2-4
2-6
2-8
BI516