Weil-McLain Series 2 Manual page 62

® S
ERIES
Field wiring
Line voltage wiring (120 VAC)
Make the following line-voltage connections, some
of which depend on your system and how the ECO
control will be programmed. The call outs below refer
to Figure 71.
P1
120VAC Power input
1. Provide and install a fused disconnect or service
switch (15-ampere rated recommended) as required
by applicable codes.
1. Connect minimum 15-ampere, 120VAC power
wiring to green, 3-pin terminal block as shown in
Figure 71.
2. If possible, provide a surge suppressor in the supply
power line. This will reduce the possibilities of ECO
control damage due to line surges.
3. Must wire ground to this terminal to provide boiler
grounding.
P2
DHW Circulator Output, 120VAC - pins 1,4,7
1. The ECO boiler control provides dedicated 120 VAC
outputs for one DHW zone (priority) and one
heating zone.
2. Control setup requires that DHW tank be controlled
from DHW Input/Output terminals to ensure post-
pumping functionality.
Always connect the DHW circulator to
the DHW Circ. Output to ensure post-
pumping functionality.
3. DHW Circ. Output cannot be used to control a
central heating zone. It bypasses the outdoor reset
function.
P2
HEAT Circulator Output, 120VAC - pins 2,5,8
1. Control setup requires this output to:
a. Provide 120VAC to a system circulator (such as
on a zone valve system with system circulator).
b. Provide 120VAC to a boiler loop circulator (in
primary/secondary piping).
c. Provide post-pumping functionality (built
in to ECO control) to prevent lockout due to
temperature over shoot.
Always connect the system circulator (direct
connect) or boiler circulator (primary/
secondary) to the HEAT Circ. Output to
ensure post-pumping functionality.
2. The ECO control will activate HEAT Circ. Output
if the Heat thermostat or input device calls for heat,
after DHW heating (if used) is satisfied.
Do not connect more than one (1)
circulator to the boiler circulator
terminals. Connecting more than one
(1) circulator can damage the control. If
an additional circulator is needed use an
isolation relay for the additional circulator.
62
2
-
G
AS FIRED WATER BOILER
(continued)
— Boiler Manual
Figure 71 ECO line voltage
(120VAC)
Output circuits are 120VAC. If an output is to
operate a low voltage circuit, use an isolation relay.
CIRCULATOR POWER
current for each circulator is 2.2 amps at 120
.
VAC
For circulators with higher amp ratings, you must
install a circulator relay or starter to provide line
voltage to the circulator. For circulators rated over
2.2 amps, connect only the circulator relay or starter
coil to the ECO circulator terminals.
WIRING INFORMATION
wiring connection locations. See Figure 73, page 64
for the complete schematic wiring diagram. See
Figure 74, page 65 for the complete ladder wiring
diagram.
input and output connections
—
The maximum allowable
— See Figure 68, page 60 for
Part number 550-142-190/1218