klover pellet boiler 24, User Manual

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18
Below find a connection example using a 3-way valve with spring return. Remember that the
hydraulic connection must be made in a way that when the valve is at rest, the water passes from the
gas boiler. Only when the pellet boiler temperature is sufficient (value set from control panel), the 3-
way valve is powered and therefore closes the gas boiler circuit and opens the
Pellet Boiler circuit.
BR
OW
N
W
IR
E
YE
LL
OW
/G
RE
EN
W
IR
E
BLU
E
W
IR
E
BLA
CK
W
IR
E
3-WAY VALVE
N.B.: the brown wire can be used to control any service relay.
Connection to the room thermostat
A bridge clamp is installed on the rear of the boiler (free contact), which is useful to connect any room
thermostat.
In this way, connecting an external thermostat with the function to open or close the contact
depending on the heat request will be easier.
OPERATION PRINCIPLE
With open contact:
1. The boiler directly changes to functioning economy
“T-OFF ECONOMY”
reducing work power to minimum.
2. The boiler pump switches off.
3. The temperature in the boiler increases due to thermal inertia until reaching
the temperature set on
“SET H2O”
, displaying
“T-H2O ECONOMY”.
4. The boiler now automatically switches off if at least one of the following
conditions exist:

If it remains in Functioning Economy
“T-H2O ECONOMY”
for a time set on
Pr44 (30 minute default setting).

If it exceeds the temperature differential set on Pr43 (factory set value
5°C) that is
H2O Temperature > (
“SET H2O”
+ Pr43)
N.B.:
the pump is calibrated to start at temperatures ≥ 83°C in every condition (see parameters
table).
ATTENTION: If the room probe is also enabled in the remote control (see
– “ Menu 04”
) the boiler
enters economy when both cases are met.
The boiler will automatically reactivate if both of the following conditions occur:

If the contact of the room thermostat closes.

If it drops below temperature differential set on Pr43 (5°C default setting) or Temperature H2O < (
“SET
H2O” – Pr43)
.
If the above-mentioned condition occurs when the boiler is still carrying out the switch off cycle, it is required
to wait until it ends.