Input Filter Board; Reactors; Variable Speed Compressor; Time Delays - Bryant Evolution Extreme 191VAN Installation Instructions Manual

191VAN Evolution™ Extreme Variable Speed Air Conditioner: Installation Instructions
WARNING
!
ELECTRICAL HAZARD - HIGH VOLTAGE
Failure to follow this warning could result in personal injury or death.
Electrical components may hold charge. DO NOT remove control box
cover for 2 minutes after power has been removed from unit.
PRIOR TO TOUCHING COMPONENTS:
Verify zero (0) voltage at VFD connections shown on control box
cover.

Input Filter Board

The input filter board connects the line voltage to the VFD. The input
filter board ensures the inherent electrical noise generated by VFD does
not affect other electronics in the household and contains fuses to protect
against excess input current.

Reactors

There are either 1 or 2 reactors per system depending on model. These
reactors are large inductors and must be connected to the VFD to
operate.

Variable Speed Compressor

This unit contains a high-side variable speed compressor that has a wide
operating range. All models contain variable speed rotary compressors.
All of the variable speed compressors operate on 3 PH AC provided by
the VFD. This compressor can only be operated by the specific VFD
supplied with the unit.
CAUTION
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage.
Do not attempt to apply line voltage directly to the compressor. This
will destroy the compressor

Time Delays

The unit time delays include:
• Five minute time delay to start cooling operation when there is a call
from the Evolution™ Connex™ System Control. To bypass this
feature, momentarily short and release Forced Defrost pins.
• Five minute compressor re-cycle delay on return from a brown-out
condition.

Variable Speed Fan Motor

The fan motor included in this unit is a Brushless DC motor with an
integrated control module. The control module is supplied DC voltage
from the VFD. The speed command is provided from the VFD through
a 0-5V signal. The commanded speed is determined by the PCM and is
communicated through Modbus to the VFD. The motor cannot be
connect to line voltage. Fan motor speed varies based on outdoor
ambient temperature, compressor speed, and system demand. The fan
motor may cycle off and on if extremely low airflow is requested by the
outdoor unit controls.

Pressure Equalization Valve (PEV)

The PEV is located at the discharge of the compressor and the inlet to the
accumulator. The purpose of the PEV is to prevent the compressor from
starting with a high pressure differential, which can cause compressor
damage. Occasionally the unit may experience a brief starting delay
while the PEV equalizes pressure before start-up.

High Pressure Switch

This unit contains a high pressure switch to protect against high pressure
conditions. This switch must be closed for the VFD to be powered.

Outdoor Pressure Transducers

There are two pressure transducers installed on this unit. One is located
at the discharge of the compressor and the other is located at the suction
of the compressor. The pressure transducers are connected to the P1 and
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
P2 inputs on the PCM. Each transducer may be connected to either
PCM input. These transducers have a range from 0 to 620 psig and are
used for system protection, control, and diagnostics.

Stator Heat Operation

This unit has an internal stator heating function.
windings will occasionally be energized during the OFF cycle to start the
stator heat operation, thus maintaining a sump temperature that is
essential for compressor reliability. The compressor will not run during
this process.
Evolution™ Connex™ Controlled Low Ambient
Cooling
This unit is capable of low ambient cooling down to 0°F (-17.8°C) with
Low Ambient enabled on the Evolution™ Connex™ System Control. A
low ambient kit is not required.
The Evolution™ Connex™ System Control provides an automatic
evaporator coil freeze-protection algorithm that eliminates the need for
an evaporator freeze thermostat. The only accessories that may be
required are wind baffles in locations likely to experience cross winds in
excess of 5 miles an hour. This generally occurs only on roof and
open-area applications.
Low ambient cooling must be enabled in the Evolution™ Connex™
System Control setup. The outdoor unit fan will cycle on and off based
on outdoor coil temperature, outdoor air temperature, and suction
pressure measurements to keep the compressor running at the proper
conditions.

Troubleshooting

Systems Communication Failure

If communication with the Evolution™ Connex™ System Control is
lost, the control will flash the appropriate fault code (see
Check the wiring to the Evolution™ Connex™ System Control and the
indoor and outdoor units and power.

Model Plug

The system PCM has been pre-programmed with an electronic model
plug that establishes the model configuration, i.e. size and type, of the
unit. This electronic model plug removes the need for a physical model
plug to be installed into the PCM. A set of physical model plugs for all
sizes is available as a service component for use when replacing the
PCM and/or the model configuration is missing or unknown.
Additionally, the model configuration can be set using the Evolution™
Connex™ System Control, the Service Tech App, or the PCM dip
switches. The correct model configuration must be set for the system to
operate properly. (see Table
Refer to the Service Manual for more information on model
configurations.
Table 7 – Model Plug Information
MODEL MODEL PLUG
NUMBER NUMBER
1
91VAN024 HK70EZ009
HK70EZ021
191VAN036
191VAN048 HK70EZ033
1
91VAN060 HK70EZ045
17
The compressor
7).
PIN RESISTANCE
(K-ohms)
PCM MODEL
Pins 1-4 Pins 2-3
5.1 91
11 39
18 11
18 220
Table 11).
24K-AC
36K-AC
48K-AC
60K-AC