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6 - INSTALLATION - Electrical connections
NOTICE! the maximum room
thermostat cable length permitted
is 65 ft (20 m). For longer lengths,
up to 300ft (100 m) a shielded
cable, with the shield connected to
the ground, must be used.
WARNING!!! Since the room
thermostat wires conduct 24 Vac,
they must never be run through
conduits containing 120Vac power
wires or an electrical shock hazard
will exist
6.5 - Installing
the outdoor
temperature sensor
(optional)
Install the outdoor temperature
sensor, on an exterior wall of the
building facing NORTH or NORTH-
EAST, at a height of between 4 ft (1.2
m) and 6 ft (1.8 m) from the ground
level. On multi story buildings, install
the sensor near the upper half of the
second fl oor. Do not install the sensor
above doors, windows or ventilation
outlets nor directly under balconies or
gutter pipes. Do not shield the outdoor
temperature sensor. Do not install the
sensor on walls without overhangs,
or not protected from rain. To connect
the outdoor temperature sensor to the
boiler proceed as follows:
Figure 16 - Room thermostat location
1. remove the boiler casing according
to the instructions given in section
13.2 and open the junction box per
section 6.2;
2. use a two conductor cable with
a minimum cross section of # 18
AWG. between the boiler and the
outdoor temperature sensor.
NOTICE! the maximum outdoor
temperature sensor cable length
permitted is 65 ft (20 m). For longer
lengths, up to 300 ft (100 m) a
shielded cable, with the shield
connected to the ground, must be
used;
WARNING!!! Since the outdoor
temperature sensor wires conduct
24 Vac, they must never be run
through conduits containing 120
Vac power wires or an electrical
shock hazard will exist.
3. connect the outdoor temperature
sensor cable leads to terminals OS
as shown in fi gures 14 and 15;
4. connect the outdoor temperature
sensor cable leads to the ends of
the external temperature sensor.
Set the boiler so that it detects the
outdoor temperature sensor, as
follows:
1. press down the
12 seconds until the display starts
blinking and shows
23
2. then press and release the
button several times until the
following
3. using the
change the parameter value from
00 to 01 or 02 in relation to the
type of outdoor reset desired as
explained in section 12.10;
4. press the
until exiting the menu; the display
will no longer fl ash.
6.6 - Alarm output
Inside the electrical box (see 13.15
and 13.16) there is an electrical
connection for a 120Vac output that is
energized each time the boiler goes
into a lock-out or error condition. The
Installer can use this output to activate
any kind of external signalization
devices such an audible alarm,
phone, or other devices.
button for
;
parameter appears;
and
keys,
button repeatedly
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