Indoor Air-Flow Verification; Refrigerant Charging - Rheem P17 Series Installation Instructions Manual

5.0 SYSTEM START-UP AND REFRIGERANT CHARGING
5.7 Indoor Air-Flow
Verification
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.
IMPORTANT:
for EcoNet enabled (-)H2T air-handlers must be
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manually set by selecting the correct speed taps
on the motor terminal block. Refer to the (-)H2T
installation manual for the procedure for selecting
the correct speed tap for the specific application
and the procedure for verifying the air-flow level.
Indoor air-flow must also be manually selected
using dip-switches on the control board of (-)HMV
air-handlers and (-)802V, (-)96V, (-)97V, and (-)98V
gas furnaces if a conventional 2-stage thermostat
is used. The approximate indoor air-flow will be
displayed in 100 CFM increments by a flashing
LED on the (-)HMV air-handler control board or
furnace control board while the blower is operating
(one flash per 100 CFM). Refer to the (-)HMV air-
handler or gas furnace installation manual for the
location and appropriate dip switch settings.

5.8 Refrigerant Charging

The refrigerant charge for all systems should be
checked against the Charging Chart located inside
the access panel cover.
WARNING:
compressor shell is hot. Touching the compressor top
may result in serious personal injury.
CAUTION:
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:
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 indoor air-flow
The top of the scroll
R-410A pressures are
DO NOT operate the
When the (-)P17 heat pumps are matched to
EcoNet enabled (-)HMV air-handlers and
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(-)802V, (-)96V, (-)97V, and (-)98V gas furnaces and
are controlled by the EcoNet
indoor air-flow is automatically set to the proper
level based on the model data stored in the
Variable Speed Outdoor Control (VSODC) memory
card. When the indoor blower is operating, the
EcoNet Control Center will display the indoor
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CFM in the air-handler or furnace portion of the
Status Menu.
Once the system is operating in the Charge Mode,
confirm the indoor air-flow when the system is
operating at maximum capacity is close to the
desired air-flow. Make the necessary adjustments
at the indoor unit if necessary to achieve the
desired air-flow level. If the displayed air-flow level
on the EcoNet Control Center (not applicable
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for (-)H2T air-handlers) is not reasonably close
to the desired indoor air-flow, 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 before
making adjustments. Once the indoor air-flow is
verified, the indoor air-flow trim adjustment (not
applicable for (-)H2T air-handlers) may be changed
to suit the installation and should be done prior to
final charge adjustment.
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 or an (-) H2T/(-) HMV
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.
Control Center, the
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