Alfa 74 Thermostat Range
The Alfa 75-RTDF is a complete panel mounted time control unit for cooler and freezer installations.
Functionality includes:-
All settings can be done by internal parameters. Supplied with 12Vac. A special transformer can optionally be delivered.
The Alfanet 75 remote display is a controller for remote control from another Alfa thermostat on the network, such as a control thermostat positioned beside the coldroom while the remote control is situated in the office which can read out and control the connected thermostat.
This controller has only a network connection and no sensor inputs and relays outputs. To control another Alfa thermostat on the network, it is necessary that the network number from the Alfanet remote display is the same as the number from the Alfa which has to be controlled.
Functionality includes:-
- Room thermostat with digital read-out
- Start delay for evaporator fan
- Defrost clock to start the defrost on interval base or real-time base<.
- End-of-defrost thermostat with time limit
- Off-cycle, electrical or hot-gas defrost<./li>
All settings can be done by internal parameters. Supplied with 12Vac. A special transformer can optionally be delivered.
Variations
The Alfanet variation of this unit has an RS-485 network connection for read-out and data logging on the Alfanet PC software. The Alfa 75-RTDF does not have this network connection.The Alfanet 75 remote display is a controller for remote control from another Alfa thermostat on the network, such as a control thermostat positioned beside the coldroom while the remote control is situated in the office which can read out and control the connected thermostat.
This controller has only a network connection and no sensor inputs and relays outputs. To control another Alfa thermostat on the network, it is necessary that the network number from the Alfanet remote display is the same as the number from the Alfa which has to be controlled.
Technical Specification
Housing: Black ABS Plastic
Dimensions: 35 x 77 x 71,5 mm
Front: Polyester, Screw terminals
Power input: 12 Vac, 50/60 Hz, (-10/+5%)
Measure range: -50/+50°C
Accuracy: ± 0.5% of the range
Sensor: SM 811 (PTC sensor, 1000 Ohm at 25°C) (not included)
Relay: cooling SPST contact 250V/5A (NO) heating SPST contact 250V/5A(NO) alarm SPDT contact 250V/5A(NO/NC)(common, not inductive)
Functions: Cooling, Natural defrost, Electric defrost, Hot gas defrost, Interval defrost, Real time defrost
Voltage: 12 V
Remote Control: Optional unit can be connected.