SYSTEM OPERATION
18
The communicating platform is a system that includes a
communicating air handler/furnace/modular blower and air
conditioner or heat pump. Any other system congurations
are considered traditional (or legacy) system.
A heating/air conditioning system diers
from a legacy/traditional system in the manner in which
the indoor unit, outdoor unit and thermostat interact with
one another. In a traditional system, the thermostat sends
commands to the indoor and outdoor units via analog 24
VAC signals. It is a one-way communication path in that the
indoor and outdoor units typically do not return information
to the indoor board.
On the other hand, the indoor unit and outdoor system
“communicate” digitally with one another. It is now a
two-way communications path. The thermostat still sends
commands to the indoor and outdoor units. However, the
indoor board may also request and receive information
from the outdoor unit. This information may be displayed
on the Cool Cloud HVAC app.
Airow demands are managed dierent in a fully
communicating system than they are in a legacy wired
system. The system operating mode (as determined by
the thermostat) determines which unit calculates the
system airow demand. If the indoor unit is responsible for
determining the airow demand, it calculates the demand
and sends it to the ECM motor. If the outdoor unit or
thermostat is responsible for determining the demand, it
calculates the demand and transmits the demand along
with a fan request to the indoor unit. The indoor unit then
sends the demand to the ECM motor. The following table
lists the various communicating systems, the operating
mode, and airow demand source.
For example, assume the system is an air conditioner
matched with an air handler. With a call for low stage
cooling, the air conditioner will calculate the system’s low
stage cooling airow demand. The air conditioner will then
send a fan request along with the low stage cooling airow
demand to the air handler. Once received, the air handler
will send the low stage cooling airow demand to the ECM
motor. The ECM motor then delivers the low stage cooling
airow. The table below lists the nominal high and low
stage airow for the communicating air conditioners and
heat pumps.
*SZC160241 800 600 800 600
*SZC160361 1200 800 1200 800
*SZC160481 1550 1100 1550 1100
*SZC160601 1800 1210 1800 1210
*SZC180241 850 550 850 550
*SZC180361 1250 850 1250 850
*SZC180481 1750 1210 1750 1210
*SZC180601 1750 1210 1750 1210
Typical 18 AWG thermostat wire may be used to wire the
system components. 100 feet is the maximum length of
wire recommended between indoor unit and outdoor unit,
or between indoor unit and thermostat.
To Next Page
Loading...
Need help?
General