Quincy Compressor QED-1250, Instruction Book, Page: 38 / 116

Ref. Description
M1 Refrigerant compressor
M5 Fan motor 1
M6 Fan motor 2
PT20 Pressure sensor, condenser pressure
Q3 Circuit breaker, transfo
Q4 Circuit breaker, control voltage
Q5 Circuit breaker, fan motor
Q8 Circuit breaker, electronic regulator
S0 Main switch (customer's installation)
S1' Remote start-stop switch
S2 High pressure switch
S3 Flow switch
T1 Transformer, control voltage
TT89 Temperature sensor, refrigerant temperature
TT90 Temperature sensor, LAT in airflow
TT91 Temperature sensor, ambient
Y1 Solenoid valve
1X0 Terminal strip, supply
1X3 Terminal strip, earthing
1X5 Terminal strip, < or = 24 VAC
1X6 Terminal strip, < or = 24 VDC
1X7 Terminal strip, alarm contacts
1X10 Electronic regulator ethernet connection
Dryer protection
The unit is provided with a phase sequence relay (K25).
The high-pressure shut-down switch (S1) stops the compressor motor when the pressure in the
refrigerant circuit reaches the upper set-point of the switch.
After tripping:
• The switch must be reset manually by pressing its reset knob and by pressing reset key (//)
on the regulator (electronic regulator).
The compressor motor has a built-in thermic protection. If the thermic protection trips, the
compressor motor will be stopped. The compressor will restart when the motor windings have
cooled down, which may take up to 3 hours.
Instruction book
36 2920 1992 00