Johnson Controls FRICK QUANTUM LX Operation page 39

ter from freezing. When Pump Down is enabled
and the compressor is stopped the DX circuits
digital outputs are de-energized but the com-
pressor remains running for the delay period.
When the delay period times out, or the Suction
Pressure falls below the On When Suction Above
setpoint, the compressor is turned off. To force a
compressor that is in Pump Down to stop, press
the compressor stop screen command key again.
The following selections are provided:
• Disabled - The Pump Down feature is
ignored.
• Enabled - The Pump Down feature will
be utilized.
• [On When Suction Above] - After
sending the compressor stop com-
mand, if the Suction Pressure reading is
above this setpoint, Pump Down will be
invoked. In Pump Down, the compres-
sor will stay on to continue vaporizing
the refrigerant.
• [On When Suction Above Delay] -
The amount of time in minutes that the
compressor will Pump Down before it is
stopped.
DX Circuit - The following are digital outputs:
• [#1 Action]:
• Disabled – DX Circuit #1 is off.
• DX Circuit On with compressor – DX
Circuit #1 is on if the compressor is on,
or it is off if the compressor is off.
• DX Circuit On by Capacity Position -
When this option is selected, two other
setpoints are shown:
• Off When Below.
• On When Above.
DX Circuit #1 is turned On when the Capac-
ity Position is above the On When Above
setpoint, and it is turned Off when the Ca-
pacity Position is below the Off When Below
setpoint.
QUANTUM™ LX COMPRESSOR CONTROL PANEL
OPERATION
• [#2 Action]:
• Disabled – DX Circuit #2 is off.
• DX Circuit On with compressor – DX-
Circuit #2 is on if the compressor is on,
or it is off if the compressor is off.
• DX Circuit On by Capacity Position -
When this option is selected, two other
setpoints are shown:
• Off When Below.
• On When Above.
DX Circuit #2 is turned On when the Capac-
ity Position is above the On When Above
setpoint, and it is turned Off when the Ca-
pacity Position is below the Off When Below
setpoint.
Liquid Injection:
An output is provided for an optional Liquid In-
jection solenoid valve. The function of this out-
put is only available if the compressor has Liquid
Injection oil cooling and it has been enabled. Liq-
uid Injection controls the supply of liquid refrig-
erant to the compressor. Liquid Injection is off
(the solenoid is closed) if the compressor is off.
• Disabled
• Enabled
[On When Discharge Temperature Above] -
When the Discharge Temperature is above
this setpoint, the [Delay] timer will begin
to time down. Once the delay timer times
out, the Liquid Injection solenoid output will
energize, until the Discharge Temperature
drops
[Dual Port Transition] – This setpoint applies to
Dual-Port Liquid Injection. When the com-
pressor volume exceeds this setpoint, the
High VI Liquid Injection output is energized
to redirect liquid refrigerant to help maxi-
mize liquid injection oil cooling.
[Hot Gas Bypass] - This option is available if it
applies to the compressor model (Refer-
ence 090.020-M; Compressor Model Differ-
ences).
090.022-O (MAY 12)
Page 39