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54
Sensor Trim
Corrective offsets can be applied to the space temperature and the
supply air temperature sensor readings. These corrections are set in
the
Configuration
→
TRIM
menu for the display, or in the
Maintenance
→
TRIM
table for CCN. See the Indoor Air Quality
section for available adjustments to IAQ and OAQ sensor readings.
The space temperature may be corrected by entering either a
calibration temperature value in
SPT.C
, or an offset temperature
value in
SPT.T
. The supply-air temperature may be corrected by
entering either a calibration temperature value in
SAT.C
, or an
offset temperature value in
SAT.T
. Temperature corrections should
only be made if sensor readings are compared to an accurate
reference temperature measurement device.
Transducer Troubleshooting
The electronic control uses suction pressure transducers to measure
the suction pressure of the refrigerant circuits. The pressure/voltage
characteristics of these transducers are in shown in Table 22, the
5vdc power is applied to legs A and B of the transducer and legs B
to C represent the voltage drop shown in the table. The accuracy of
these transducers can be verified by connecting an accurate
pressure gauge to the second refrigerant port in the suction line.
Forcing Inputs and Outputs
Many variables may have their value forced through CCN or
directly at the local display. This can be useful during diagnostic
testing and also during operation, typically as part of an advanced
third party control scheme. Input and output points that may be
forced are indicated as ‘forcible’ in the write status column of the
display and CCN tables.
If the user needs to force a variable, follow the same process as
when editing a configuration parameter. A forced variable will be
displayed on the Scrolling Marquee with a blinking period “.”
following its value. A forced value on Navigator
™
accessory is
indicated with a blinking “f”. A forced value on CCN devices is
indicated with “Control” if forced at the unit display, or
“Supervisor” if forced via CCN. To remove a local force with the
Scrolling Marquee, select the point with the ENTER key and then
press the up-arrow and down-arrow keys simultaneously.
NOTE
: In the case of a control power reset, any force in effect at
the time of power reset will be cleared.
48/
50P
G
and
P
M
Summary of Contents for 48/50PG Series
Page 32: ...32 C07009 Fig 20 Air Baffle Dimensions 48 50PG03 16 48 50PG and PM...
Page 33: ...33 C08077 Fig 21 Air Baffle Dimensions 48 50PG20 28 and 48 50PM16 28 48 50PG and PM...
Page 58: ...58 C08549 Fig 28 48PG03 16 Control Wiring Schematic 48 50PG and PM...
Page 59: ...59 C08550 Fig 29 50PG03 16 Control Wiring Schematic 48 50PG and PM...
Page 64: ...64 C08471 Fig 34 Typical 48PG and PM16 28 Control Schematic 48PM16 28 Shown 48 50PG and PM...
Page 66: ...66 C08557 Fig 36 Typical 50PG and PM16 28 Control Schematic 50PG20 28 Shown 48 50PG and PM...
Page 68: ...68 C08558 Fig 38 Typical 48 50PG and PM16 28 Power Schematic 48 50PM16 28 Shown 48 50PG and PM...
Page 72: ...72 C08565 Fig 42 Typical 48 50PG20 28 Component Arrangement 48 50PG20 24 Shown 48 50PG and PM...
Page 73: ...73 C08067 Fig 43 48 50PM16 28 Component Arrangement 48 50PG and PM...
Page 74: ...74 C08562 Fig 44 48 50PM16 28 with Humidi MiZert Component Arrangement 48 50PG and PM...
Page 208: ...208 48 50PG and PM...