Home Freeze Protection; Water Freeze Protection - Riello NexPolar Series Installation And Technical Service Instructions

CoolING
Control panel Water setpoint with direct access to
occupation
Home cooling setpoint
Sleep cooling setpoint
Away cooling setpoint
HEaTING
Control panel Water setpoint with direct access to
occupation
Home cooling setpoint
Sleep cooling setpoint
Away cooling setpoint
Once the air setpoints have been defined, the water setpoints must be configured.
4.3

Home freeze protection

This protection function is used in units equipped with remote user
interfaces only, and serves to maintain a default minimum room
temperature of 6°C. When the room temperature drops below the
Steps Table
Set the
minimum
AIR_STP
room
temperature
9
Never shut off the unit, otherwise the home freeze protec-
tion function cannot be guaranteed. For this reason, the

4.4 Water freeze protection

When the OAT is low (and the pump is stopped), there is a high
risk of the water heat exchanger and the water pipes freezing. The
pump must be activated regularly, or else in continuation, in order
to circulate the water and reduce this risk. The BPHE and the pipes
of the electric heaters present on the hydronic kit are likewise acti-
vated in certain cases.
The pump is controlled as follows:
— If the OAT drops below the heat exchanger's setpoint* [P517]
+ 3°C, the pump is activated at minimum speed for 1 minute
every 15 minutes.
— If the OAT drops below the heat exchanger's setpoint* [P517] +
3°C and the EWT or the LWT drop below the heat exchanger's
setpoint* [P517], the pump operates continuously at minimum
speed.
Steps Table
Defines the
criteria for
activating the GEN_
water freeze CONF
protection
function
Never shut off the unit, otherwise the freeze protection function
cannot be guaranteed. For this reason, the disconnecting switch for
the main machine and the client must always be left closed.
the control panel
the control panel
Par. Designation
This is the minimum room temperature
Home freeze
permitted. If the room temperature drops
427 protection
below this nominal value, the unit will
setpoint
begin functioning in heating mode.
Par. Designation
Heat Criteria according to which the external
517 exchanger air temperature triggers the water freeze
setpoint protection function
Water setpoint from the parameters
range
20 - 38°C Home cooling setpoint [P424]
Home cooling setpoint [P424] + Sleep
20 - 38°C
cooling offset [P425]
Home cooling setpoint [P424] + Away
20 - 38°C
cooling offset [P426]
Water setpoint from the parameters
range
21 - 34°C Home cooling setpoint [P421]
Home cooling setpoint [P421] + Sleep
21 - 34°C
cooling offset [P422]
Home cooling setpoint [P421] + Away
21 - 34°C
cooling offset [P423]
home freeze protection setpoint [P427], the unit is activated in
heating mode until the room temperature increases: [P427] + 2°C.
Description
disconnecting switch for the main machine or the client
must always be left closed.
— In order to exit from these two conditions, a hysteresis of 1K
is applied.
The electric heaters are controlled as follows:
— The electric heaters are switched on during the defrosting
function, and for 1 minute after the defrosting has been com-
pleted.
— The electric heaters are switched on if the OAT is below the
heat exchanger's setpoint* [P517] and if the EWT or the LWT are
below the heat exchanger's setpoint* [P517].
— The electric heaters are switched off if the OAT is above the
heat exchanger's setpoint* [P517] + 0.5°C and if the EWT (if
configured) and the LWT are above the heat exchanger's set-
point* [P517] + 0.5°C.
* The user is responsible for modifying the configurable value.
Description
If a shut off valve is installed, a bypass must also be installed, as
shown below.
49
menu
20 - 38°C
menu
range Default Ex. Units
6,0 -
6
12,0
range Default Ex. Units
3,0 - 5,0 3
FUNCTIONS
range
0 - 10°C
0 - 10°C
range
21 - 34°C
-10 a 0°C
-10 a 0°C
10 °C
3 °C