147
CONTROL PANEL
INSTALLATION
3.7.3
Heating / Cooling selection
As previously indicated, the Heating / Cooling selection applies
only to heat pumps. The Heating / Cooling selection can be con-
trolled in different ways, according to the type of active opera-
tion. Cooling mode is set by default.
Heating / Cooling can be set:
− locally on the unit using the item HC_SEL in the General
Parameter menu;
− from remote through the heating/cooling selection con-
tact if the unit is in Remote mode;
− from a network command if the unit is in Network mode.
Heating/Cooling mode can be manually set by the user or can
be automatically set from the control system. When heating/
cooling is automatic, the outdoor air temperature determines
the heat/cool/standby switching (cauto_sp e hauto_sp). Auto-
matic switching is optional and requires the user configuration
(parameter "HC_SEL" of the General Parameters menu).
To set the heating / cooling / auto mode [HC_SEL]:
− Move to the Main Menu.
− Select General Parameters
.
− Set Heat/Cool Selection.
Heat/Cool selection [HC_SEL]
0 Cooling
1 Heating
2 Automatic switching
To enable the heating/cooling automatic switching [auto_sel]:
− Move to the Configuration Menu.
− Select Heat/Cool Configuration
.
− Set Automatic Switching Selection = Yes.
To set the cool switching setpoint [cauto_sp]:
− Move to the Main Menu.
− Select Setpoint
.
− Set Cool Switching Setpoint.
Cool Switching Setpoint [cauto_sp]
Range
Default
From 3.9 to 50.0ºC 23.9ºC
From 39.0 to
122.0ºF
75.0ºF
To set the heat switching setpoint [hauto_sp]:
− Move to the Main Menu.
− Select Setpoint
.
− Set Heat Switching Setpoint.
Heat Switching Setpoint [hauto_sp]
Range
Default
From 0 to 46.1ºC
17.8ºC
From 32.0 to
115.0ºF
64.0ºF
9
To be able to change heating/cooling setpoint you need to
login first.
3.7.4
additional heating (heat pumps)
NXH
heat pumps can be coupled to a boiler or to electric heat-
ers.
The
boiler
or the
electric heaters
are used instead of the heat
pump when the heating is not enough due to low outdoor air
temperature or not possible due to some faults. They can also
be used to provide domestic hot water when necessary.
BOILER CONTROL
The boiler is activated when the outdoor air temperature is
lower than the boiler OAT threshold set by the user, that is set
by default to -10°C (14°F).
To set boiler OAT threshold [boil_th]:
− Scroll the Configuration Menu.
− Select Heat/Cool Configuration
.
− Set the Boiler OAT Threshold.
Boiler OAT Threshold [boil_th]
Range
Default
From -15.0 to
15.0ºC
-9.9°C
From 5.0 to 59.0ºF 14.2°F
ELECTRIC HEATING CONTROL
The phases of the electric heating can be activated as addition-
al heating when the OAT is lower than the electric heating OAT
threshold set by the user, set by default to 5°C (41°F).
Electric heating is allowed when the following conditions are
met:
− The unit works at full capacity.
− The electric pull-down time has elapsed [ehs_pull].
− OAT is lower than OAT threshold [ehs_th].
There are four electric heating phases, and the last one is used
for the backup. That means that usually only three heating
steps are allowed, while the fourth is used only when the unit
is stopped due to a detected fault or the thermal protection is
active.
To set the electric heating OAT threshold [ehs_th]:
− Scroll the Configuration Menu.
− Select Heat/Cool Configuration
.
− Set Electric Stage OAT Threshold
Electric Phase OAT Threshold [ehs_th]
Range
Default
From -5.0 to 21.0ºC 5.0°C
From 23.0 to
70.0ºF
41.0°F
9
Electric heating is NOT allowed when the demand limit is
active on the unit.
Содержание 20120391
Страница 93: ...93 PANORAMICA DEI PARAMETRI INSTALLAZIONE ...
Страница 169: ...169 ALARM CODES INSTALLATION ...
Страница 185: ...185 OVERVIEW OF THE PARAMETERS INSTALLATION ...
Страница 186: ......
Страница 187: ......