Table 5: Possible Switches To Install On System - Riello NXHP Series Installation, Operation And Maintenance Instructions

4 -OPERATION
b - Proprietary Protocol communication
The unit can be started or stopped and its operating mode can be selected from the network.
Steps Table Par. Designation
System Mode
44
Request
c - JBus communication
The unit can be started or stopped and its System Mode can be selected from the JBus network. Refer to JBus registers in § 7.
Parameter overview.
4.2.4 - Switches
Some modes described below could be activated or desactivated by switches. Moreover other remote contacts can be connected to
the unit in order to add new features. If the unit is managed by remote contacts, it is necessary to change the value of parameter User
Interface type in UI_CONF table, with [P521] = 1.
Switch
On/Off Switch (remote)
Mode Heat/Cool (remote)
Normal/Eco (remote)
Day / Night (remote)
Safety Switch
Power limitation Contact
(1)
Off Peak Contact (1)
Loadshed Request Switch
(1)
Solar input Contact
(1)
DHW Request Switch from tank
DHW Priority Contact (thermal
switch)
(1)
DHW Timed Override Button
(1)
Anti-Legionella Cycle
Request Button
(1)
External Alarm Indication Input
Boost Mode Request Switch
(1)
(1) Customized input (DI#07 to #09), parameters [P501] to [P503]
50
Description
0 = Off
1 = Cool
2 = Heat
4 = DHW
5 = Booster Cooling
6 = Booster Heating
8 = Purge (water pump is constantly running to purge the
hydraulic circuit)
9 = Drying (slow water temp. ramp-up in Heating mode for
UFH drying)

Table 5: Possible switches to install on system

Definition
Used to start and stop the unit (if no user interface)
Used to select (if no user interface):
- Cooling mode = contact closed
- Heating mode = contact opened
Used to select (if no user interface):
- Home mode = contact opened
- Away mode = contact closed
Used to select (if no user interface):
- Day mode = contact opened
- Night mode = contact closed
This contact should be a 'normally closed' type
Used to reduce the compressor maximum frequency to avoid noise or lower consumption
This switch is to close when the rate electricity price is high (Electric Heat Stages are not allowed)
This contact is requested by electricity company (i.e. in Germany) to control the green electricity (wind, solar)
production and consumption more efficiently. When switch is closed then unit shall be stopped as soon as
possible
When switch is closed then the unit is not allowed to run in Heating or DHW Mode because hot water is
produced from a solar source
When this input is closed, the Domestic Hot Water production is requested. A thermal switch mounted on the
(1)
Domestic Hot Water tank shall be connected to this input
When the status of this input goes from open to closed, the unit is switched to Domestic Hot Water
production for the programmed duration [P708] regardless of the Space Heating demand and the current
DHW schedule
DHW Timed Override Hour [P720] is increased of one hour at each pulse (falling edge). If value exceeds 24
hours, it returns to 0. If switch remains active for more than 5 seconds, DHW is allowed to run regardless of
schedule
When the status of this input goes from open to closed, the Domestic Hot Water production is requested with
the Anti-Legionella setpoint
When this input is opened, alarm is tripped. This alarm is for information only, it does not affect the unit
(1)
operation.
When the status of this input goes from open to closed, the unit is switched to boost mode
Range Default Ex. Unit
0 to 9 - 1 -