Install Instructions
Field wiring
%,%#42)#!, 3(/#+
(!:!2$ — For your
safety, turn off electrical
power supply at service en-
trance panel before making
any electrical connections
to avoid possible electric
shock hazard. Failure to do
so can cause severe personal
injury or death.
The installation must com-
ply with: National Electri-
cal Code and any other
national, state, provincial or
local codes or regulations.
In Canada, CSA C22.1 Ca-
nadian Electrical Code Part
1, and any local codes.
Wiring must be N.E.C.
Class 1. If original wiring
as supplied with boiler must
be replaced, use only type
105 °C wire or equivalent.
Boiler must be electrically
grounded as required by
National Electrical Code
ANSI/NFPA 70 – latest edi-
tion.
&IGURE Field wiring overview (see Figure 66, page 60 and
Figure 67, page 61 for detailed schematic and ladder wiring
diagrams)
ECO boiler wiring
#ONNECTINGTERMINALS
All field wiring is made through the six colored connectors
(shipped loose with boiler) directly to the control module.
Line voltage, 120 VAC, terminals are on the top of the
control module. Low voltage, 24 VAC, terminals are on the
bottom of the control module.
7IREENTRANCES
Wire entrance knockouts are provided on the top and bot-
tom of the boiler cabinet:
1. Line voltage—3 knockouts on the top left of the cabinet
(Line In, DHW Circ., Heat Circ.)
2. Low voltage—2 knockouts on the bottom left and 2
knockouts on the top right of the cabinet
3. Display wiring—a single knockout on the right side
of the cabinet
Installer MUST use a strain relief through
jacket knockouts. Failure to do so can cause
severe personal injury, death or substantial
property damage.
Installer MUST SEAL all electrical entrances
using a sealed strain relief or a strain relief
sealed with duct seal putty or silicone. Sealing
the entrances prevents the boiler from draw-
ing air from inside the boiler room. This is
particularly important if the boiler is located
in the same room as other gas appliances.
Failure to seal entrances could result in sever
personal injury, death or substantial property
damage.
7IREROUTINGINTHECABINET
Line voltage:
1. Install 4 of the wire tie bases to the holes on the left
side interior of the cabinet.
2. Line voltage should be wired from the top left electrical
entrances following the left side of the cabinet.
3. Wires should be bundled together and secure with the
provided wire ties to the wire tie bases located on the left
side wire chase. Two sets of bases are provided, one for
line in and one for the circulator outputs. Route wires
in front of the transformer then into terminal blocks.
Part number 550-142-122/0513
56
TM
GAS-FIRED WATER BOILER — Boiler Manual
Low
Voltage
Line
Voltage
Low
Voltage