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191VAN Evolution™ Extreme Variable Speed Air Conditioner: Installation Instructions
CAUTION
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage and/or
improper operation.
Do not attempt to install an incorrect model plug as this could cause
some units to operate incorrectly and fail prematurely.
NOTE: Model configuration diagnostics will occur while the equipment
is operating, but changes to a model configuration using a physical
model plug will not affect equipment operation until power is cycled. An
electronically set model configuration will take effect immediately. The
PCM remembers the most recent valid model configuration detected at
power-up, regardless of that configuration coming from an electronic or
physical model plug. Model configuration memory is preserved across
power cycles, so proper equipment operation will continue even if power
to the equipment is lost and then restored. An installed model plug at
power-up takes precedence over a model configuration value stored in
memory. If a new valid model plug value is detected at power-up, the
model configuration memory will be updated to that new value.
Pressure Switch Protection
The outdoor unit is equipped with high pressure switch. If this switch
opens, the VFD will lose line power and the compressor and fan motor
will not operate. The high pressure switch opens at 670 +/- 10 psig and
closes at 470 +/- 25 psig. The outdoor pressure transducer installed at the
discharge of the compressor is monitored by the PCM and the PCM will
take action to avoid the high pressure switch from opening.
Compressor Protection
The Primary Control Module continuously monitors the operation of the
compressor and takes action when it is nearing the edge of the
boundaries of reliable operation.
transducers to maximize the reliability and minimize the off time of the
system due to operation outside of the compressor boundaries. The
PCM takes different actions for each edge of the boundary, but each
culminates in a reduction of compressor speed to the minimum
allowable and, in the worst case, will power off the compressor to avoid
excursions outside the boundaries. If a shutdown does occur then the
PCM will set a diagnostic code per
Line Voltage Diagnostics
The primary control module monitors the line voltage for low and high
voltage events. If a low voltage or high voltage event occurs and another
fault occurs simultaneously the PCM will set a fault that indicates this
was due to the system conditions and not the components. If this occurs
several times in a row the PCM will set a malfunction and lock out
operation for 1-4 hours, depending on the condition. Refer to
for the list of fault codes and
Table 12
lockout times for each one.
Forced Defrost Pins
The forced defrost pins have several functions. When shorting the pins
using a clip wire the below functions can be executed:
• If the pins are shorted more than 1 second and less than 5 seconds
when the system has just turned off and an active call for cooling is
present, the 5 minute initial on-time will be defeated.
• If the unit is in the OFF mode and the pins are shorted at power on the
unit will enter into Status Code Recall Mode.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
The PCM utilizes the pressure
Table
11.
Table 11
for the list of malfunctions and the
Temperature Thermistors
Thermistors are used to sense the outdoor ambient (OAT), liquid line
(LLT-AC), outdoor suction (OST), and outdoor discharge (ODT) line
temperatures. All thermistors are 10K thermistors except for the ODT,
which is a 50k thermistor. Refer to tables 6 and 7 for resistance vs
temperature values.
Refer to
Table 8
and
Table 9
the thermistors.
Table 8 – 10K Thermistor Resistance Values
TEMPERATURE
25.0°C (77.0°F)
0.0°C (32.0°F)
-17.8°C (0 °F)
Table 9 – 50K Thermistor Resistance Values
TEMPERATURE (°C)
25
75
125
If any thermistor should fail, the control will flash the appropriate fault
code (see
Table
11).
IMPORTANT: The OAT, OCT/LLT, OST, and ODT thermistors should
be factory mounted in the final locations. Check to ensure thermistors
are mounted properly (See
Fig.
Outdoor Suction Temperature (OST)
The OST must be secured on the suction tube and aligned longitudinally
to the vertical surface of the tube axis (see
proper resistances.
Outdoor Air Temperature (OAT)
The OAT is a 10K thermistor used for multiple system operations. It
provides the outdoor air temperature to the primary control module and
Evolution™ Connex™ System Control. It is essential for controlling the
system and is used in almost all modes of operation. The sensor is
mounted in the control box per
resistances.
Fig. 28 – OAT Thermistor Mounting Location
18
for resistance values versus temperature for
RESISTANCE (K OHMS)
10.0 + / - 2.3%
32.6 + / - 3.2%
85.5 + / - 3.4%
RESISTANCE (K OHMS)
50.15 + / - 5.0%
7.565 + / - 3.0%
1.7 + / - 1.4%
28,
Fig. 29
and
Fig.
30).
Fig.
28). See
Fig.
28. See
Table 8
Table 8
for
for proper
A230575
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