Modbus Communication With Boilers/Water Heaters; Heating / Cooling Management; Heat Modules And Heat Pumps - Siemens TUTORbit POL687 Instructions For Installation, Use And Maintenance Manual

4 - INSTALLATION
- Heat pump
Enable or not a heat pump for heating / cooling and / or DHW.
Access the menu Configuration->Heat pump->HP mode
to set the heat pump type being connected (The subsequent
references to Q1, Q2, Q3, and Q4, correspond to the contact
identified in the POL 955 expansion):
HP Mode 1: Heat pump for heating and cooling, driven by an
ON-OFF digital output (Q1 closed contact = ON, open contact
= OFF) and a digital heat / cool switching output (Q2 closed
contact = cool, open contact = heat).
HP Mode 2: Heat pump for heating and cooling, driven by a
digital output for the cool demand, which also turns on the
HP (Q1 contact closed, the HP turns on and goes into cool;
contact open, the HP turns off), and a digital output for heat
demand, which also turns on the HP (Q2 contact closed, the
HP turns on and goes into heat, the HP contact turns off).
HP Mode 3: Heat pump for heating and cooling, controlled via
0-10Vdc signal: a digital output ON-OFF (Q1 contact closed
= ON; contact open = OFF), an analog output 0-10Vdc (X1;
M) and a digital output switching heat / cool (Q2 contact open
= heat; contact closed = cool).
HP Mode 4: Heat pump for heating and cooling, controlled via
4-20mA signal: a digital output ON-OFF (Q1 contact closed =
ON; contact open = OFF), an analog output 4-20mA (X1; M)
and a digital output switching heat / cool (Q2 contact open =
heat; contact closed = cool).
-Save & Reset
Every time you change a parameter in the "Configuration"
menu, you must select "Yes" in the "Save & Reset" menu. The
Tutorbit then resets to reload the new configuration selected.
4.8.1 - Modbus communication with
boilers/water heaters
TutorBit is able to communicate with MYDENS T or
AGUADENS T model heat modules with MODBUS protocol.
In Figure 4-2 it is possible to see the terminals in which the
wires for this communication must be connected.
MODBUS communication is optional, as it has no effect on the
operating mode of TutorBit or the system. This communication
only serves to read some parameters of the heat module,
including:
- 0-10Vdc analog signal read by the module;
- Water pressure of the module;
- Single burner error (MYDENS T and AGUADENS T
appliances can have up to 4 burners inside their casing);
- Percentage power of the single burner;
- Status of the module pump;
- Supply temperature of the module.
These data can be consulted in the menu System state ->
Modules state.
COSMOGAS

4.9 - Heating / Cooling management

To enable cooling, a heat pump must be installed as shown in
the diagrams in Chapter 4.21. Through the menu Parameters-
>System control it is possible to select:
Antifrost: the system is switched off and switches on only to
guarantee frost protection.
Heating:
The system heats the rooms and produces domestic hot
water (if provided). There is always a parallel between DHW
production and heating production.
TutorBit can also control hybrid systems, which provide
for the integration of energy by a heat pump. If the outside
temperature is in an economically viable range of the heat
pump (temperatura esterna maggiore di Parameters -> Heat
pump -> CutOff Temp.), Tutorbit assigns the work priority
to the latter.
If the outside temperature drops below Parameters -> Heat
pump -> CutOff Temp., the heat pump is switched off and
the modules remain to serve the heating.
When the heat pump work, if it cannot reach the required
supply temperature within Parameters -> Heat pump ->
Saturation time, TutorBit turns on the modules to integrate
the temperature up to the desired value.
If the atmospheric conditions (temperature / humidity) reach
values such that the heat pump starts defrosting cycles,
Tutorbit automatically adjusts the threshold of the minimum
usable outdoor temperature.
If the outside temperature rises above Parameters ->
Modules -> Spring Temp., the heat pump is automatically
switched off.
Cooling:
Tutorbit can also be used to control a heat pump that is cooling.
The heat pump demand occurs automatically when the outside
temperature rises above Parameters -> Modules-> Autumn
Temp.
The system can cool and heat the rooms and produce
domestic hot water (if provided).

4.10 - Heat modules and Heat pumps

The 0-10Vdc output controls the heat modules, on a PID basis,
according to the error between the temperature of the cascade
sensor (Water heater t.) and its required temperature.The
required temperature at which the sensor Water heater t. must
be placed corresponds to the highest required temperature
among those of the heating zones.
In order to compensate for any temperature losses, generated
by the hydraulic backflow preventer, it is possible to increase
the required temperature of the T. Generator by a fixed value,
settable on Parameters->Modules->Casc. setp offsetup.
Likewise, the heat pump increases its required temperature
by a fixed value of 5 ° C.
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TUTORBIT