Service manual
6 – 11
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
Oil Control
These setpoints determine how the Vission 20/20 will
manage the oil of the compressor, see Figure 6-10.
Compressor Control Screen - Oil Control & Liquid
Injection Control.
Oil Pump Press Restart Ratio:
• The on and off setpoints defi ne when the oil pump
will cycle on and off if the oil pump is selected to cycle
from the confi guration screen.
Oil Separator Heater Temp:
• When the oil temperature falls below this setpoint
the oil heater will turn on. Note, there is a 5°F differen-
tial associated with this setpoint. For example, when
set at 100°F, the heater will turn on at 95°F and off at
105°F.
Liquid Injection
The setpoints is this section are to control the behavior
of the liquid refrigerant injected into the compressor for
oil cooling purposes. The liquid injection solenoid con-
trol is based off of discharge temperature whether the
compressor uses just an injection solenoid or a motor-
ized valve in conjunction with the solenoid.
Liquid Injection Solenoid Control ONLY
• When using only the liquid injection solenoid, the so-
lenoid is activated once the value of discharge tem-
perature meets or exceeds the value of “Liquid inj.
Setpoint 1” and the value of oil separator tempera-
ture meets or exceeds the value of “Oil Sep. Temp.
Override”. The injection solenoid will deactivate if
either of setpoints are not met. This will prevent situ-
ations where the discharge temperature may rise
quickly, but the oil temperature is still very cold. By
preventing the liquid injection solenoid from turning
on at this point, the oil separator will not be subjected
to additional liquid refrigerant, that would cool the oil
Section 6 • Compressor Control
Figure 6-10. Compressor Control Screen - Oil Control & Liquid Injection Control