Installation instructions supplement
GB - 15
38YYS...G
ENGLISH
Condensing temperature controller
operation
Full voltage:
When the liquid line temperature is over the setpoint value plus
half proportional band (factory set by supplier), the output voltage
to the motor is 97% or more of supply voltage.
Low voltage:
When the liquid line temperature is below set point minus half
proportional band, the output voltage to the motor is set at the
minimum value available.
Proportional band:
In the temperature range set by the two above-mentioned
conditions and knows as proportional band, the controller changes
the output voltage to the motor in proportion to the liquid
temperature; therefore, the motor can rise or decrease its speed
and so maintain a constant condensing temperature.
Hard start:
At each compressor starting the full voltage output to the fan
motor is provided for 3 seconds.
Temperature setting
Proportional band width set at +11 / -11°C in respect to the set point
temperature.
Setting: the head pressure controller is
supplied factory set at 42°
Hard start time 3 seconds.
Condensing temperature controller: wiring diagram
Troubleshooting
See paragraph “Troubleshooting”.
Note:
In case of first start after a pause of several hours at – 15°C, with
low voltage supply (198V) high pressure switch HIP may trip off
the unit.
In this case, reset the system by switching OFF and ON the power
supply.
1FC - Fan Capacitor
1OFM - Fan motor
L - Live power supply
N-Neutral power supply
O-Reversing valve control
SENSOR
SENSOR
CONTROL
N. OUT
CONTROL
N. OUT
LINE OUT
LINE IN
NEUTRAL
IN
HP SELECT
temperature sensor
L
N
O
10FM 1FC
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