49
at minimum imput rate, in order to
conserve energy.
To use the heater more efficiently, it
is recommended to set selector “4”
to position “D”. If the winter is
particularly cold, and the desired
temperature inside the home can
no longer be maintained, set
selector “4” to position “C”.
During winter operation, both the
heating and the sanitary hot water
functions are active.
5.5 - Adjustments
for winter
operation
To adjust the heater for winter
operation, proceed as follows:
Set the temperature control
thermostat “3” to between 140°
and 150°F (60° and 65°C).
Rotate the selector “4” to
position “D” or “C”, as explained
in the preceding chapter.
Water is circulating inside the
radiators by means of a pump
installed inside the heater.
The circulation pump runs only
when the temperature inside
the heater exceeds 140°F
(60°C)
approximately and selector “4” is in
position “C” or “D”.
The pump may make some noise
when it first starts. This is due to
the presence of residual air inside
the heating system, and goes away
by itself without any action. In any
case, check that the air vent cap
(figure 1, detail 3) is partially
unscrewed.
5.6 - Room
thermostat
To control the room temperature
and for improved energy
conservation, we recommend
installing a time-programmable
thermostat (a device that can turn
the heating on and off and/or lower
or increase the room temperature
according to the time of day). For
the installation of such a unit, call a
qualified technician.
The heater is designed to support
connection to devices of this type.
5.7 - Resetting
the Ignition
Module
The ignition module, (fig.
1
, item
9
),
carries out numerous checks on
heater functioning: on the burner
and on the flame detection system.
When the ignition module detects
that one of these components is
malfunctioning, it stops the heater.
When the heater goes into the
lock-out state, the indicator “E”
illuminates.
To restart turn knob “4” in a
counterclockwise direction to
position “E”. Only a brief pause is
required on position “E”, and
selector “4” automatically returns
from position “E” to position “D”.
If this operation has been done and
if the heater does not start up or if
this situation repeats often, call a
licensed authorized personnel.
5.8 - Low water
cut-off device
This device is triggered when the
water pressure inside the heating
circuit (indicated by pressure gauge
“6”), drops below 8 PSI (0.5 bar).
When this occurs, indicator “E”
illuminates and the heater shuts off.
To restore normal functioning, the
pressure gauge “6” reading must be
brought back above 15 PSI (1 bar)
To do this, follow the instructions
given in paragraph 3.25.
5.9 - Manual
Reset High-Limit
Thermostat
This device turns the burner off
completely if heater temperature
exceeds 210°F (99°C). The user
can detect this because the burner
will not turn on even if the heater
temperature is low and the red light
indicator “E” is ON.
To restore the heater to its normal
functioning condition follow this
sequence:
allow the heater to cool down to
104°F (40°C);
unscrew and remove the
protection cap of high limit
thermostat reset button “2”;
press the button. Use a pen or a
skinny object to manually reset
5 - USE
(the high limit thermostat will not
reset unless the button is
completely pressed).
If the high limit thermostat
continues to trigger, call a licensed
authorized personnel.
5.10 - Heating
Circulator Pump
The circulator pump will
only
start
working when heater temperature
reaches approximately 140°F
(60°C) and selector “4” is in the “C”
or “D” position.
Initially, the circulator pump might
make noises, which are due to
pockets of air left inside the water
circuit; they will disappear soon
without having to do anything. In
any case, check that the cap on
the automatic air vent, (fig. 1, item
3) is open.
5.11 - Temperature-
Pressure gauge
The temperature-pressure gauge “5”
and “6” is a dual device that
measures:
- the internal temperature of the
heater “5” (thermometer);
- the pressure of the heating circuit
“6” (manometer)
5.12 - Gas valve
service switch
This service switch “1” is used by a
service technician to prevent the
gas valve from operating
electrically.
Should overheating occur or the
gas supply fail to shut off, turn
“OFF” the gas valve service switch
“1”.
5.13 - Shut-off
procedure
If the heater is to be shut-off for a
relatively brief time (a few weeks
and there is no risk of freezing)
simply place selector “4” in the off
position “A”.
If there is the risk of freezing during
your absence, leave the heater with
selector “4” in position “D” and the
heater temperature control “3” set
to 150°F (65°C).
If there is a room thermostat
installed, make sure it is