Honeywell ELECTRONIC REFRIGERATION CONTROL PCR-300 - Manual (Page 6)

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a) housing with 2 mounting tabs:
open out the lateral mounting tabs; clip the unit on the 35 mm rail
and press tabs in again.
b) housings with 1 mounting tab:
put housing on the upper 35 mm rail. Clip the unit on the 35 mm
rail, lower tab clips on the rail automatically. To remove the unit
from the rail press in lower mounting tab with a screw driver, lift
unit.
¼ Mounting of sensor:
¼ Use a cable clamp to secure sensor T1 in a suitable position.
¼ Secure evaporator sensor T2 in the evaporator fin core at the point
where it is suspected icing is the greatest. It is advisable to use a
point in the lower third of the finned evaporator.
5.2 Electrical installation
☛ CAUTION: The mains voltage and system frequency must be the same
as the nominal values on the device’s rating plate.
Work on electrical systems must be performed by qualified personnel.
Relevant local safety regulations must be observed.
Wiring diagram: