05/21/2009 2
BI501
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 Rating Amp Stages GPM
EB-S-13 46,000 13.5
kW 56A
3
2-6
EB-S-18 61,400 18
kW
75A
4
2-8
EB-S-23 76,800 22.5
kW 94A
4
2-12
EB-S-27 92,150 27
kW 113A
4
2-18
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-ZTS-1 zone controller priority zone now 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 EB-S 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 (fits within basic boiler
cabinet) 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-ZTS-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
EB-S-27 can be wired for 208, 3-
phase – call factory for drawing
EH013. Also note at 208 there is a
significant reduction in capacity.
Suggest using 3-phase, 208,
WarmFlo models EB-WO-13-2 or
EB-WO-27-2.
