- 12 -
Autonomous temperature control mode for switched cooling/heating - Reg. Tx
In this mode, as well as in the previous mode, the outdoor unit compressor performance is
controlled to keep the set temperature for cooling (Goal C) or heating (Goal H). The room
temperature is measured by the resistance thermometer T2. The resistance thermometer T1
measures the temperature of the indoor unit heat exchanger. The thermometer T2 measures
the temperature in the room. Placing of temperature sensor T2 depends on
installation‘s
demands
. In the cooling mode, this heat exchanger operates as an evaporator and the
measured temperature is used to control its defrosting, while in the heating mode, it operates
as a condenser and the measured temperature is used to control the outdoor unit and protect
against exceeding the condensation temperature of the refrigerant used. The control module
can be activated remotely using the digital input On/Off and the current mode is set
according to the status of the binary input H/C. If the input H/C is not connected, the
module operates in the cooling mode; if this input is connected to the common
terminal, the module operates in the heating mode. The outdoor unit is controlled via a
serial line, which also supplies its communication circuits. For 1-phase outdoor units, the
terminals SC-1 and SC-2 of the module must be connected to the terminals 1 and 2 of the
outdoor unit, respectively. For 3-phase outdoor units, the terminals are interchanged, so to
work properly, the terminals SC-1 and SC-2 of the module must be connected to the
terminals 2 and 1 of the outdoor unit, respectively.
Fig. 5. SCMI-01.4 control module in the autonomous temperature control mode for
switched cooling/heating
To Next Page
Loading...
Need help?
General
