Indoor Air-Flow Verification; Refrigerant Charging - Rheem A17 Series Installation Instructions Manual

5.0 SYSTEM START-UP AND REFRIGERANT CHARGING
5.5 Indoor Air-Flow
Verification
Correct indoor air-flow and proper supply air distri-
bution is critical to system comfort, efficiency and
reliability. Excessive indoor air-flow results in elevated
humidity levels and excessive air noise. Low indoor
air-flow reduces system capacity and can result in coil
icing and compressor failure. Correct indoor air-flow
must be verified before the refrigerant charge level is
finalized.
Confirm the indoor air-flow is at the desired level when
the system is operating at maximum capacity (2nd
stage). 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
Center (not applicable for applications with (-)H2T
air-handlers) is not reasonably close to the desired
indoor air-flow, confirm cooling dehumidification is
disabled, the indoor air-flow trim adjustment (not appli-
cable for (-)H2T air-handlers) is set to the desired level
(0%, +10% or -10%), and verify the model numbers of
the indoor and outdoor units are an approved combina-
tion by the manufacturer before making further adjust-
ments.
IMPORTANT:
EcoNet enabled (-)H2T air-handlers must be man-
TM
ually set by selecting the correct speed taps on the
motor terminal block even for applications using the
EcoNet™ Control Center. Refer to the (-)H2T installa-
tion manual for the procedure for selecting the correct
speed tap for the specific application and the proce-
dure for verifying the air-flow level. The 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 conven-
tional 24VAC thermostat is used. The approximate in-
door air-flow will be displayed in 100 CFM increments
by a flashing LED on the (-)HMV air-handler 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 appro-
priate dip switch settings.
When the (-)A17 condensing units are matched
to EcoNet enabled (-)HMV air-handlers or
TM
(-)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 Two-Stage Out-
door Control (TSODC) memory card. When the indoor
blower is operating, the EcoNet
display the indoor CFM in the air-handler or furnace
portion of the Status Menu.
26
Control
TM
The indoor air-flow for
Control Center, the
TM
Control Center will
TM

5.6 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 refrig-
erant. 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 following method is used for charging the system.
All steps listed should be performed to ensure proper
charge has been set. For measuring pressures, the
service valve ports on the liquid service valve (small
valve) and the suction service valve (large valve) are to
be used.
The optimum refrigerant charge for any outdoor
unit matched with an indoor coil/air handler is affected
by the application. 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
(-)HMV series air handler in the down flow or horizon-
tal right-hand discharge may require removal of some
refrigerant since the factory charge could result in an
overcharge condition.
The top of the scroll
R-410A pressures are
DO NOT operate the