30
Start-Up
5.0 SYSTEM START-UP AND REFRIGERANT CHARGING
5.7 Indoor Air-Flow Verication
Correct indoor air-flow and proper supply air
distribution is critical to system comfort, efficiency
and reliability. Excessive indoor air-flow results in
elevated humidity levels in the cooling mode and
excessive air noise. Low indoor air-flow reduces
system capacity and can result in coil icing and
compressor failure in the cooling mode and can
cause nuisance high pressure switch tripping and
increases power consumption in the heating mode.
Fortunately, when the RD17AZ outdoor unit is matched
to the correct air-handler or furnace/coil combination
and are controlled by the communication EcoNet
TM
Control Center, the indoor air-flow is automatically
controlled to the proper level based on the model
data stored in the UODC. When the indoor blower is
operating, the EcoNet
TM
Control Center will display
the indoor air-flow in the Service Menu of the control.
The approximate indoor air-flow is also displayed in
100 CFM [47 l/s] increments by a flashing LED on the
air-handler or furnace control board while the blower
is operating (one flash per 100 CFM [47 l/s]) for
installations where a conventional 24VAC thermostat
is used.
Once the system is operating in the Charging Mode,
confirm the indoor air-flow is close to those values in
the table below. If the displayed indoor air-flow is not
reasonably close to the value in the table, confirm
cooling dehumidification is disabled, the indoor air-
flow trim adjustment is set to 0%, and verify the
model numbers of the indoor and outdoor units are
an approved combination by the manufacturer. Once
the indoor air-flow is verified, the indoor air-flow trim
adjustment may be changed to suit the installation
and should be done prior to final charge adjustment.
NOTICE: AHRI rated indoor air-flow may differ
slightly from values in the table below.
NOTE: All indoor air-ow trims must be adjusted
using the bluetooth contractor's app.
The refrigerant charge for all systems should be
checked against the Charging Chart located inside the
access panel cover.
WARNING:
The top of the compressor
shell is hot. Touching the compressor top may result in
serious personal injury.
CAUTION:
R-410A pressures are
approximately 60% higher (1.6 times) than R-22
pressures. Use appropriate care when using this
refrigerant. Failure to exercise care may result in
equipment damage or personal injury.
Charge for all systems should be checked against the
Charging Chart inside the access panel cover.
IMPORTANT: Do not operate the
compressor without charge in the system.
Addition of R-410A will raise high-side pressures
(liquid and discharge).
NOTICE: System maintenance is to be
performed by a qualified and certified technician.
The optimum refrigerant charge for any outdoor unit
matched with an indoor coil/air handler is affected
by the application. Therefore, charging data has
been developed to assist the field technician in
optimizing the charge for all mounting configurations
(UF – Upflow, DF – Downflow, LH – Left-Hand
Discharge, and RH – Right-Hand Discharge). Refer to
the charging chart inside the access panel cover on
the unit and choose the appropriate column for the
specific application being installed or serviced. New
installations utilizing either an RCF indoor coil installed
on a gas furnace, RH3VZ or an RHMVZ series air
handler in the downflow or horizontal right-hand
discharge may require removal of some refrigerant
since the factory charge could result in an overcharge
condition for short line length applications.
The following method is used for charging systems in
the cooling and heating mode. All steps listed should
be performed to ensure proper charge has been set.
For measuring pressures, the service valve port on
the liquid valve (small valve) and the true service port
located between the two service valves are to be
used.
5.8 Refrigerant Charging
Outdoor Unit
Model No.
Displayed Indoor CFM
Cooling Mode
Displayed Indoor CFM
Heating Mode
RD17AZ24AJ3CA 750 750
RD17AZ36AJ3CA 1125 1125
RD17AZ48AJ3CA 1450 1450
RD17AZ60AJ3CA 1800 1800
To Next Page
Loading...
