19
UTC Climate, Controls & Security
PROPRIETARY
62-61661-00 Rev B
29th maI 2013
Definition
:
The superheat is a T° difference between:
The T° indicated on the expansion valve bulb and
the evaporating temperature
It is imperative to set correctly the superheat to
Optimise the unit performance
Increase compressor « life time »
Practice
:
Connect the low pressure gauge to the
evaporator
Place a « thermocouple »at the expansion valve
bulb
Start the unit to reduce the box temp to (0°C or -
20°C)
Check superheat setting
If this value is not correct, adjust the expansion
valve
Tighten the screw to increase the
superheat value
Loosen the screw th reduce the superheat
value
COMMISSIONING: SUPERHEAT
A correct superheat is:
S/H = Bulb T° - Evaporating T°
(thermometer)
(BP manometer)
Example : (thermo.) - 31°C - (mano.) - 35°C -
= S/H 4°C
Bulb :
Place the « thermocouple »
Connect the low pressure gauge
Access to the
adjusting screw
Note for MT units do each compartment
individually
CHECKS & SETTINGS
