05/21/2009 1
BI501
INTRODUCTION
With this temperature sensing controller capability, the electric heating element stages are automatically
turned on and off to establish a fixed outlet water temperature. This outlet temperature is sensed at the
outlet pipe, the controller regulates four stages, and attempts to control the water temperature at a value
determined by the setup arrangements. Field setting the outlet temperature at the design or realistic
temperature required by the radiation is more efficient.
Even though this temperature sensing series adjusts outlet temperature independent of water flow and
prevents high limiting; it is still very important that the hydronic system
be correctly designed for the
building, the total heat loss requirement, and proper hydronics design and installation practices. This
boiler is the energy
source
for the water flow and radiation system. If the water flow and radiation
systems are not adequate for the Btuh heat loss of the building, installing the Electro-Boiler with this
temperature control feature will not necessarily supply the comfort and heating for the building.
Control and operate as a “cold boiler” concept. Do not, under any circumstances, simply jumper R and W
and allow the temperature sensing controller to operate this Electro-Boiler as a “hot boiler”. Unless there
is at least 2 GPM flow, the staging delays will cause temperature overshoot and could open up the manual
reset limits.
Standby boiler wiring arrangement is optional, order standby kit EB-S-SB.
In most dual heat installations (with standby kit EB-S-SB) this Electro-Boiler is plumbed in series with an
existing oil, gas, or wood boiler. For gas or oil, the Electro-Boiler is generally at the gas/oil outlet; but for
wood, the Electro-Boiler must be on the inlet sides. The standby boiler cannot be operated as “hot
boiler”. This will defeat the Electro-Boiler. Rewire as required, standby boiler is turned on from the
brown wires.
In the case of
existing
fossil fuel boiler conversions, it is assumed the expansion tank, valving, air
bleeder, and circulation pump are in place, in good operating condition, and adequate for the overall
system design.
In the case of
new
installation (radiant floor or baseboard), use standard hydronics water heating practices
with the necessary expansion tank, air bleeder, valving, water pump, etc., sized for the total capacity of
the system. The Electro-Boiler is turned on with an “R and W” closure from the zone system wiring.
208 Volt application
– the elements within the standard product are rated a 240 volts. If operating at
208, there will be approximately 25% reduced capacity. The internal transformer may or may not
adequately operate the control system from a 208 source. Voltage measurements between “R” and “C”
must be 22VAC or greater when the system is in the complete operational mode. True 3-phase,
208-volt
,
models are available in the WarmFlo series. Contact factory, models EB-WO-13-2 and EB-WO-27-2.
In the case of under floor
radiant
heating, the basic components for the electric energy, heating system
typically includes:
1.
Electric boiler itself, drawing BX501 –
covered by this manual.
2.
Plumbing kit or piping material at the boiler itself –
can be ordered as a kit.
EB-BK-TS –
shown on plumbing installation drawing BX502, pages 1 and 2.
EB-PK-TS –
shown on plumbing installation drawing BX502, page 3.
3.
Circulating pump –
typically sized for head pressure and system flow requirement, typical catalog
number EB-P2. Large pump maybe required for 23 or 27 kW.
4.
The under floor circulating tubes and manifolds –
provided and manufactured by others, not covered in
this manual.
APPROVED TUBING/PIPING
When plumbing this boiler and its peripheral parts to the loop system, all plumbing parts and/or tubing
must be sealed to prevent entrance of oxygen.
Use only tubing or polyethylene tubing with oxygen Diffusion Barrier.
