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57
Menu 1 – EXV1 Expansion Valve Setup
EXV1 Expansion Valve Setup Screen
Figure 38 – EXV1 Expansion Valve Setup Screen
Table 25 – EXV1 Setup Parameters
Menu Item
Description
Default
Value
Mode Control
In Auto Mode, the control system adjusts the valve to maintain discharge pressure
(Super Heat Mode or Suction Pressure Mode). In manual mode, the system drives
the valve to a fixed position and holds it there for service diagnostic purposes.
AUTO MODE
Minimum Position
The minimum percent the expansion valve will go to.
5%
Maximum Position
The maximum percent the expansion valve will go to.
100%
Start Percent
This sets the valve to a pre-start position for a given period.
50%
Startup Position Delay
This is the delay time from compressor startup to hold the valve at the startup
percent open position.
30 sec.
Superheat Setpoint
(Superheat Mode)
The valve meters the amount of refrigerant into the evaporator in the precise
quantity in order to maintain superheat. The difference between the saturated
suction temperature and the suction line temperature is the superheat. The
superheat is factory set for 10°F and should never exceed 15°F or go below 4°F.
Only a trained refrigeration service technician should adjust this valve.
10.0
MOP Mode Setpoint
(Suction Pressure
Mode)
The EXV behaves as a high limit suction pressure regulator when the suction
pressure rises above a preset suction pressure. The valve regulates to maintain
suction pressure instead of superheat. The suction pressure set point is factory set
to allow the compressor to run at the highest allowable suction pressure. The valve
control automatically reverts to superheat control if the suction pressure falls
below the maximum limit or if the superheat becomes dangerously low.
150 PSI
Kp
Proportional PID value
20
Ti
Integral PID value
1000
Td
Derivative PID value
0