24VNA6: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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Amber Status Light
Amber colored STATUS light indicates operation and error status. See
Table 7 for definitions.
5x7 LED Matrix
The Primary Control Module (PCM) is equipped with a 5x7 LED
matrix. This matrix will display the 4 highest priority diagnostic codes
in a scrolling fashion with 2 seconds in between each code. At the end
of the 4th highest priority diagnostic code there is a 5 second pause
before the list repeats.
VFD Communications Light
The PCM is equipped with a bi-color LED for indicating successful or
unsuccessful communication with the VFD. This LED is located just
below the VFD-PCM communication port on the PCM. The LED will
flash green when good messages are received from the VFD and red
when bad or no messages are received from the VFD.
Bluetooth® Module
This unit is equipped with a module, which includes Bluetooth wireless
technology that allows a user to connect via an application on a phone or
tablet. It is recommended that the Bluetooth Module be activated during
the installation process.
Follow these steps to download and activate Bluetooth Module:
1. Download the app
– Search the App Store™ or Google Play™ for Carrier Service
Technician to download. The app is available on phone and tablet
devices. If you already have the app downloaded, please ensure
you have updated to latest version.
To Activate Bluetooth Module:
1. Login to the Carrier Service Technician app using your
HVACPartners username and password.
2. On the App Home screen, tap the Connect to Equipment button.
Please ensure your equipment is powered on and your mobile
device is within 10 feet of the equipment throughout this whole
process
NOTE: In order to connect to equipment using Bluetooth, you must
have Bluetooth enabled on your mobile device, and you must allow the
Service Tech app to access Bluetooth and location services in your
device permissions. For more information on how to enable these
features and permissions, please consult documentation from your
device manufacturer.
3. The app will scan for nearby Bluetooth enabled equipment. To
activate a new unit, the app will display "New Equipment". Tap on
that item and then select the Pair button
4. The app will display the equipment Serial and Model number.
Please confirm these are correct for the equipment you are trying to
activate and tap continue.
5. The app will now automatically progress through the activation
process. Once the steps are complete, the unit is activated
successfully and your device will be automatically paired to the
equipment.
NOTE: You will only have to perform this activation once and you will
now be able to pair to this equipment directly with the app in the future.
Variable Frequency Drive (VFD)
The inverter or variable frequency drive (VFD) is located inside the
control box. This is an air-cooled device that communicates with the
PCM and drives the compressor to the demanded RPM. The VFD
provides DC voltage to the fan motor and sends a fan RPM signal to the
electronics on the fan motor. The VFD changes the line voltage to 300
volts 3-phase, and varies the frequency to drive the compressor at the
desired RPM.
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 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. Some models contain variable speed rotary
compressors while others contain variable speed scroll compressors. All
of the variable speed compressors operate on 300VDC provided by the
inverter. This compressor can only be operated by the specific inverter
supplied with the unit.
Time Delays
The unit time delays include:
• Five minute time delay to start cooling operation when there is a call
from the user interface. To bypass this feature, momentarily short and
release Forced Defrost pins.
• Five minute compressor re-cycle delay on return from a brown-out
condition.
Vapor Injection Electronic Expansion Valve (EXV-VI)
Some models in this product family contain a secondary EXV for
controlling the vapor injection circuit. This circuit is comprised of a
brazed plate heat exchanger (BPHE), an EXV (EXV-VI) and
interconnecting tubing. The PCM drives this EXV closed except for in
high ambient cooling in efficiency mode. The control of the vapor
injection circuit allows greater capacity and efficiency than when not
operational.
BLDC Inverter-Controlled 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 and compressor speed. The fan motor may cycle
off and on if extremely low airflow is desired.
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 startup.
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.
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
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