RDZ UMHPI, Руководство пользователя

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UMHPI
Industrial inverter air/water heat pumps with axial fans
21
Example of activation of the function:
H10 = 1
H44 = 28

Digital input [terminals: AID2 – AID2]
Closed contact

Heat pump in sanitary mode.
Open contact

Heat pump in plant mode.
H54 = 128
H61 = 6(default)

In case of using a 3-way changeover valve with 3 contacts for power supply [terminals: NO1 – N - NC1]

In case of using a 3-way changeover valve with 2 contacts for power supply (with spring return),
[terminals: NO1 – N]
For the models UMHPI 260, this function can be activated only with the presence of the optional “GI” module.
7.15 PLANT CIRCUIT REMOTE SENSOR
In some plant solutions (example: heat pump in parallel with a boiler on the same hydronic circuit and diverter valve) it could be
necessary to remote the plant circuit temperature sensor in order to allow the on-board unit controller to correctly process the
plant system management.
In order to enable this function, please enter into the parameters
PRG

PSS

PRG

(insert the service password)

PRG

PAr

PRG

CnF.
I/O ports – Parameter Value Description
*H19 41 Enablement of the plant remote sensor
(*) Alternatively, it is possible to use another digital input, see paragraph 6.5.
The plant circuit remote sensor adjusts the heat pump temperature only during the startup period of the compressor(s), the
shutdown is managed by the exhaust temperature sensor of the heat pump. For more explanation herein below is reported an
illustrating table regarding the operation of the system:
Mode of
operation
Enablement of the heat pump call
Heating
Temperature measured by outlet sensor of the heat pump < setpoint Hea - b05
and
Temperature measured by plant circuit remote sensor < water setpoint Hea - ( b22-b05)
Cooling
Temperature measured by the outlet sensor of the heat pump > setpoint Coo + b05
and
Temperature measured by plant circuit remote sensor > setpoint Coo + ( b22-b05)
NOTE: b05=1°C; b22=5°C.
7.16 VAPOR INJECTION (only for V version)
In the above drawing it is shown a simplified diagram of a refrigerant circuit that uses injection mono-compressor and
intermediate exchanger with injection "economizer". The purpose of the injection is to obtain an "intermediate" cooling of the
compressor in order to contain the discharge temperature below the critical values and allow it to operation even with very high
compression ratios (for example, particularly with very low outdoor temperature and high temperature of the produced water).
As you can see from the diagram, this is obtained drawing off part of the liquid after the condenser and making it expand through
the LEV2 valve which will be defined as "VEIV", at an intermediate temperature between the evaporating temperature and the
condensing temperature, inside a freon-freon exchanger called economizer and through it the remaining liquid passes allowing to
increase greatly the sub cooling.
The gas expanded the economizer is then "injected" into the compressor at an intermediate point of the compression so as to
cause a cooling that allows to keep the exhaust temperature within the preset limits.