Electro Industries Electro TS Series Manual

Multiple Boilers – Electro TS Series Application
Drawings: BC025
BX404
BH504
XX017
Information
All Electro-Boilers, except Mini-Boiler, have the same control board (EB5623**). The plug-in control chip
(software) determines how this control board is used or configured for each product model number. There
are three basic types or programs:

EB-S-**, EB-MS-**, EB-C+-** – control supply temperature is based upon a full stage (or element)
switching on and off.

EB-WA-**, EB-MA-** – control supply temperature is based upon modulation of electric element
to more accurately maintain the dial set supply temperature.

EB-WO-**, EB-MO-** – in addition to the above modulation control, the outdoor sensor provides
for the WarmFlo concept which starts at a minimum or floor supply temperature and ramps up to a
set point referencing 0° F.
Additional definition or mix – the commercial series (EB-C-**) uses staging and set-temperature concept.
But with an option EB-CO-KIT it is also WarmFlo outdoor sensing (outdoor reset), see note below.
Configuration
1. Attached BC025 illustrates the concept for parallel boilers.
2. The first or master boiler must have WarmFlo temperature set, modulation, capability (WA, MA, or
EBCA), etc.
Note: The EB-C-**-** series has factory shipped or default chip code EBCA to comply
with this recommendation. However, if it was determined that this master boiler is outdoor
reset, separate line item EB-CO-KIT will apply.
3. Using the above recommended model for the master boiler also provides built-in standby boiler
capability, if needed.
4. Consecutive (slave) boilers can be S, MS, or C. However, WA or MA will provide less stage
"hunting" and smoother operation for these consecutive boilers.
5. Utility load control is connected to the master boiler only. The slave boilers (second and
consecutive) do not need a load control connection because these units cannot turn on when the
master is in standby (SB mode). However, the slave boilers will continue to show the EL MODE
amber LED on. Perhaps this may be interpreted as a conflict, but in this arrangement it represents
the best and simplest hardware condition and presumably is acceptable.
6. The roomstat or control device is connected to the master boiler only.
7. One EB-C-STG5 (this option item) is required to link the master boiler to the next consecutive. A
second and so on is needed for consecutive boilers.
8. If the installation is a single large zone, all operation is through the master unit R and W.
Zone Configuration
1. A typical system arrangement is one or two large zones and the multiple boilers are typically sized to
satisfy these large zones. However, there may also be several small zones (15,000, 30,000 Btu, etc.)
which have individual room thermostats/pumps or zone valve and they do not require full boiler
system capacity. In fact, they may not even require the full capacity of the master boiler. For this
arrangement it is strongly recommended the Electro Industries zone controller be added to the
system.
a. EB-Z*A-* provides a configuration for zone pumps.
04/14/2009
EB-C-STG5
1 BI505