Vertiv | Liebert CRV CCD10 Condenser | User Manual
5
Overview
1.3.3
Electric heating belt
When the ambient temperature is low and the system shuts down for a long time, the refrigerant in the receiver needs
to be preheated with electric heating belt. The electric heating belt start or stop working is controlled only by the
pressure of refrigerant in the receiver. When the pressure is higher than 1.9MPa, the electric heating belts stops
heating, and when the pressure is lower than 1.4MPa, the electric heating belt starts heating. The liquid receiver is
equipped with one electric heating belt, the heating power of the electric heating belt is 150W.
For the heater, the start or stop of it only depends on the pressure of receiver, so the power supply should be always
on, figure 1-6 shows the circuit between pressure switch and electrical heating belt, 1,2 point should connected to the
electric heating belt breaker of condenser, as shown in the figure 1-5.
Figure 1-5 Power supply of electric heating belt
1.3.4
Pressure switch
The function of the pressure switch used in the Low Ambient Kit is to control the electric heating belt. The
specifications of the pressure switch used in the Low Ambient Kit is 1.9Mpa off 1.4Mpa on. It means since the pressure
switch and the electric heating belt are series circuit, so when the refrigerant pressure in the receiver is higher than
1.9MPa, the pressure switch will open, this will lead to the electric heating stop working. Similarly, the electric heating
belt starts working when the refrigerant pressure is lower than 1.4Mpa.
1
2
Figure 1-6 The circuit diagram between electric heating belt and pressure switch
Input Cable
HEATER BREAKER
Pressure Switch
Electrical Heating Belt
Power Supply
