System Or Water Flow; Multiple Zones & Radiant Temperatures; Zone Controller - Electro Industries EB-MS-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.
TABLE 1 - ELECTRO-BOILER SPECIFICATION
240 volts, 60 Hz, single phase
Model Btuh
EB-MS-10 34,000
EB-MS-15 51,000
EB-MS-20 68,000
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 temp. 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.
New, improved feature – the EB-ZEA Series zone controller priority zone now has the ability to
communicate with this 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 EB-MS 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 – order EB-ZEA-1.
2. Prevents over control or false staging up and down when the temperature sensors are attempting to
regulate – since Electro Industries' zone controller also has staging "smarts", the addition of the zone
controller will provide smoother boiler temperature control. The zone board has a dial switch for each
zone and the installer selects one of four zone capacity sizes. When dialing in the size closest to the zone
Btu/h capacity, the zone controller "smarts" only allows the appropriate boiler stage which can handle that
capacity. Also this is additive if more than one zone calls at any one time.
03/19/2009
Rating Amp Stages
10 kW 42A 2
15 kW 63A 3
20 kW 83A 4
2
GPM
2-4
2-6
2-8
BI508