ECO ULTRA Electric Boiler
Installation, Use and Care Manual
(Revision June 2017)
, Page
14.
DO NOT apply external current to these
terminals.
3.7.4.2 Zone valve zoning
Connect the low-voltage thermostat to the zone
valve motor. The components must wired such
that, upon a heating demand from a thermostat,
only the corresponding zone valve will be
actuated and will in turn activate the
ECO
ULTRA.
Connect the zone valve dry end switch
contact to the
W
and
R
boiler electrical panel
terminals
The 24 Vac power supply transformer used
must
be
powerful
enough
to
supply
simultaneously all zone valves.
3.7.5 Automatic transfer mode wiring
If needed, The ECO ULTRA boiler is designed to
automatically transfer the right energy source to
be in function. The automatic transfer mode is not
set by default. This mode allows to activate the
electric elements upon reception of an external
signal. The ECO ULTRA will select the
appropriate energy source and will activate the
renewable energy source or the electic boiler. If
the heating distribution system is equipped with a
single pump connected to the
PP
terminals of the
boiler, it will be activated on heat calls from the
thermostat, whichever the energy source
selected.
To allow the operation in automatic transfer
mode:
Open the front access panel to the boiler
electric compartment. Remove the screw at
the bottom of the controller; raise the upper
section of the controller. You will see a
switch at the back of the controller having
two positions “ELECT” and “Bi-Energ”.
Position the switch at “Bi-Energ” (see fig.9)
Install a 2 wire 18ga cable between the
contact (NC contact to allow the operation in
electricity) of the external device making the
selection of the operating mode and
terminals
E
1
E
2
(see fig.10)
Install a pump relay (such as Honeywell
RA832 or TACO SR501-4) near the
renewable energy source to authorize the
ECO ULTRA control the start up your
renewable energy source. (see fig.10)
- The relay can be supplied by an external
120V source or directly from the boiler fuse
and P2 neutral.
- Install a 2 wire 18 gauge cable between the
“
AUX
” of the ECO ULTRA and “
TT
” of the
relay RA832 (or R and W of relay TACO
501-4)
- Connect the auxiliary pump wires on the
relay terminals.
- Connect the electric terminal of the
renewable energy
on the “XX” relay RA832
terminals or 6-5 of the relay TACO 501-4
(see fig.10)
- The renewable energy source must be be
controlled by its own operation and limiting
controller.
Do not connect the main electrical supply
of the renewable energy source to AUX
terminals.
Figure 9: Back of the Controller
ECO ULTRA