Connection Of Tutorbit To Heat Pump (Hp); System Operation With Heat Pump (Hp) In Heating - Siemens TUTORbit POL687 Instructions For Installation, Use And Maintenance Manual

4 - INSTALLATION
4.18 – Connection of TutorBit
to Heat Pump (HP)
To connect to HP it is necessary to connect a POL 955
expansion to Tutorbit (see Section 4.3) and set the parameter
Configuration -> System -> Heat pump = Yes.
Many functions of the HP are related to the outside
temperature, so when connecting an HP it is necessary to set
also Configuration -> System -> Outdoor sensor = Yes.
TutorBit is able to manage different HP models, in relation to
the type of commands it can receive. The following HP modes
can be set on the menu Configuration -> Heat pump -> HP
Mode (the reference to contacts Q1, Q2, Q3 and terminals
X1 - M, can be seen directly on the POL 955 expansion):
- HP Mode = 1; HP controlled by a digital output for switching
on and off and one for HEAT / COOL switching:
Q1 open > HP in OFF
Q1 closed > HP in ON
Q2 open > HP in HEAT
Q2 closed > HP in COOL
- HP Mode = 2; HP controlled by a digital output for ignition
in COOL and one for ignition in HEAT:
Q1 open > HP in OFF
Q1 closed > HP in ON and in COOL
Q2 open > HP in OFF
Q2 closed > HP in ON and in HEAT
- HP Mode = 3; HP controlled by two digital outputs and an
analogue output 0-10Vdc:
Q1 open > HP in OFF
Q1 closed > HP in ON
Q2 open > HP in HEAT
Q2 closed > HP in COOL
X1 - M 0-10Vdc analog output for power control with PID
algorithm. 0V = minimum power, 10V = maximum power.
- HP Mode = 4; HP controlled by two digital outputs and an
analogue output 4-20 mA:
Q1 open > HP in OFF
Q1 closed > HP in ON
Q2 open > HP in HEAT
Q2 closed > HP in COOL
X1 - M 4-20 mA analog output for power control with PID
algorithm. 4mA = minimum power, 20 mA = maximum
power.
NOTE: In all the HP mode, previously envisaged, it is however
possible to command a DHW demand to HP via the digital
output Q3 where:
Q3 open > heating demand
Q3 closed > DHW demand or high setpoint
TUTORBIT
4.18.1 - System operation with heat pump
(HP) in heating
HP has a good operating efficiency only for certain outdoor
temperatures. Outside these temperatures it is convenient to
operate the module.
For this purpose, on Parameters -> Modules -> Spring
Temp. is possible to set the outdoor temperature below which
the HP starts automatically.
If the temperature drops below Parameters -> Heat Pump
-> CutOff Temp, the HP shuts down again to prevent it from
continuing to operate at too low efficiency. The heating function
will be guaranteed by the module.
When the HP is running, it checks the sensor temperature
Water Heater T. (see diagrams at Section 4.21). If the
temperature of Water Heater T. rises by 5°C (fixed value)
beyond its required temperature, the HP stops. If the
temperature of Water Heater T. drops below its required
temperature, the HP switches on again.
When the heat pump is running, help from the module is
provided:
- if the sensor temperature Water Heater T. cannot reach
its required temperature within Parameters -> Heat Pump
-> Saturation Time, TutorBit also turns on the module to
help HP until the temperature Water Heater T. has reached
its required temperature. Thereafter, TutorBit switches the
module off again.
- if the sensor temperature Water Heater T. drops below
its required temperature by a value corresponding to
Parameters -> Heat Pump -> Saturation hysteresis,
TutorBit starts counting the Saturation Time again and
so on.
ECO function in defrost with dynamic cut-off:
If the temperature of the Water Heater T. sensor drops
suddenly, it means that a defrost is in progress. In tal caso,
TutorBit immediately turns on the module to help HP finish
its defrost cycle and increases the parameter Parameters
-> Heat Pump -> CutOff Temp, so as to prevent the heat
pump from performing these uneconomic defrost cycles.
When the weather conditions have returned to such that the
HP no longer performs the defrost cycles, TutorBit returns
the parameter Parameters -> Heat Pump -> CutOff Temp
to its original value.
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COSMOGAS