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6 - INSTALLATION - Electrical connections
120Vac Line central heating
Neutral
120Vac Line domestic hot water
Figure 15 - Electrical connections
6.2 - Connecting
the power supply
cable
To connect the electrical power supply
cable, follow the steps below while
referring to fi gures 14 and 15:
remove the boiler casing following
the instructions given in section
13.2;
press the two plastic springs tabs
labeled "B" on the bottom side;
open panel "A" in the "C" direction;
remove the three screws labeled
"D";
open door "E" in the "F" direction;
install the power supply wires, "G"
as shown;
strip the power supply wires being
careful to leave the ground wire 1in
(25 mm) longer than the other two;
connect the ground wire to the
ground terminal;
connect the 120 volt hot wire to
terminal "L1";
Indirect water heater sensor (optional)
Room thermostat
120Vac LINE (HOT)
NEUTRAL
GROUND
connect the 120 volt neutral wire to
terminal "N".
NOTICE! If the 120 volt power wires
are inverted, the boiler will block,
displaying error code E21.
NOTICE! If the boiler is not properly
grounded, the boiler will block,
displaying error code E23
6.3 - Choosing the
room thermostat
This boiler is designed to function with
any type of room thermostat which
has an electrical contact with the
following specifi cations:
- open (end call for heat); closed (call
for heat);
- clean dry contact (not powered);
- electrical capacity of 24Vac, 1A.
Outdoor sensor (optional)
6.4 - Thermostat
wiring
Install the room thermostat in a part of
the house where the temperature is
as near to average as possible. Avoid
areas subject to sudden temperature
changes such as outside windows or
doors, above radiation elements, near
lamps, etc., (see fi gure 16).
Connect the room thermostat to the
boiler by following the steps below:
22
External three way
valve for indirect water
heater (Optional)
remove the boiler casing according
to the instructions given in section
13.2 and open the junction box per
section 6.2;
use a two conductor cable with
a minimum cross section of # 18
AWG between the boiler and the
room thermostat;
route the cable through an empty
cable clamp in the junction box
connect the cable leads to the "RT"
terminals as shown in fi gures 14
and 15.
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