Refrigerant Report; Electronic Expansion Valve Position; Report Heading; Evaporator And Condenser Refrigerant Pressure - Trane RTHC Installation Operation & Maintenance

Refrigerant Report

Report Heading

Refrigerant Temp & Pressure Report
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Evaporator and Condenser Refrigerant Pressure

Evap Rfgt Pressure:
Cond Rfgt Pressure:
NOTE: The evaporator and condenser pressures are
not measured directly but derived from associated
temperatures assuming saturated conditions for
R134a refrigerant.
Evaporator Refrigerant Liquid Level
Evap Liquid Level:
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The display will show the refrigerant liquid level in
inches relative to the center of the range of the liquid
level sensor as installed on the evaporator shell.
The sign "s," either + and - or - and the modifiers "or
more" used with + measurements and "or less" used
with - measurements indicate the limited range of the
sensor. When the sensor reads +1.0 or -1.0, the
display will read +1.0 inches or more" or "-1.0 inches
or less," indicating the sensor is at the extremes of its
range.
Normal operation should produce an evaporator
liquid level of "0" inches meaning no deviation from
the design level in the evaporator.
During normal operation and within 20 minutes of
startup, the liquid level should be well within the
sensor's range of ±1 inch. Small variations in liquid
level of ±.3 to .5 inch during steady state or with
small load disturbances are normal.
If the liquid level remains at the extremes of its range
for a long time, this indicates problems that could
damage the compressor or severely reduce
performance.
5 - 12
xxx.x psig
xxx.x psig
sx.x inches [modifier]

Electronic Expansion Valve Position

Expansion Valve Position:
Expansion Valve Position:
This display shows the position of the EXV open, first
as a percentage of valve stroke and also in steps (0-
2040 for smaller EXV (200 T), 0-2760 for the two
larger EXVs (300 and 400 T)). If pre-position of the
valve is required (to allow delta P to be generated)
for startup, 571 steps (28%) or 773 steps (28%),
respectively, would be displayed at that time.
Just prior to compressor start, the EXV will go into a
normal liquid level control, gradually opening, then
closing, as determined by the liquid level sensor.
Just prior to normal compressor shutdown, at the
start of the run unload mode, the EXV opens at its
maximum rate to its wide open position. This helps
equalize the differential pressure in the system and
reduces compressor action at shutdown. Upon
shutdown, the EXV is automatically recalibrated.
Saturated Evap Temperature/Evap Refrigerant
Pressure
Sat Evap Rfgt Temp:
Evap Rfgt Pressure:
Saturated Cond Temperature/Cond Refrigerant
Pressure
Sat Cond Temp:
Cond Rfgt Pressure:
Saturated Evap Temperature and Discharge
Temp
Saturated Evap Rfgt Temp:
Compressor Discharge Temp:
xxx.x% Open
xxxx Steps Open
xxx.x F
xxx.x psig
xxx.x F
xxx.x psig
xxx.x F
xxx.x F
RTHC-IOM-1C