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refrigerant charging
Warning:
T4QD Split System Heat pumps are shipped
fully charged with r410a refrigerant and
ready for installation. When system is installed
according to these instructions, no refrigerant
charging is required. if repairs make it necessary
for evacuation and charging, it should only
be attempted by qualified trained personnel
thoroughly familiar with this equipment. under
no circumstances should the owner attempt to
install and/or service this equipment. Failure to
comply with this warning could result in property
damage, personal injury, or death.
• After refrigerant line connections are completed, it is
required that you leak check and evacuate the indoor
section and all line connections (using proper methods)
before finalizing the full system refrigerant charge.
• Refrigerant charging charts are applicable only to
matched assemblies of NORDYNE equipment and
listed airflows for the indoor coil. Refer to Tables 4 - 6
(page 9) and Figures 3 - 8 (pages 10 - 12) for correct
system charging.
• T4QD outdoor units with non AHRI listed indoor coils
are not recommended. Deviations from rated airflows or
non-listed combinations may require modification to the
expansion device and refrigerant charging procedures
for proper and efficient system operation.
• The refrigerant charge can be checked and adjusted
through the service ports provided external to the
outdoor unit. Use only gage line sets which have a
"Schrader" depression device present to actuate the
valve.
• Heat Mode Verification Tables (Tables 7 - 12, pages
14 - 15) are provided for quick reference when the unit
is in heating mode and for the inspection of the liquid
line pressures and temperatures.
Charging an R-410A system in AC mode at outdoor
temperatures above 55° F for optimized sub-cooling of
10° F - 12° F.
1. With the system operating at steady-state, measure
the liquid refrigerant pressure (in psig) at the outdoor
unit service valve.
2. Measure the liquid refrigerant temperature (in
Fahrenheit) at the service valve.
3. Determine the required liquid refrigerant pressure from
Tables 4 - 6 (page 9) and Figures 3 - 8 (pages 10 - 12).
• If the pressure measured in Step 1 is greater than
the required liquid refrigerant pressure determined in
Step 3, then there is too much charge in the system.
Remove refrigerant and repeat Steps 1 through 3
until the system is correctly charged.
• If the pressure measured in Step 1 is less than the
required liquid refrigerant pressure determined in
Step 3, there is too little charge in the system. Add
refrigerant and repeat Steps 1 through 3 until the
system is correctly charged.
HeaT pump mainTenance
Warning:
To prevent electrical shock, personal injury, or
death, disconnect all electrical power to the unit
before performing any maintenance or service.
The unit may have more than one electrical supply.
Proper maintenance is important to achieve optimum
performance from the heat pump. The ability to properly
perform maintenance on this equipment requires certain
mechanical skills and tools. If you do not possess these
skills, contact your dealer for maintenance. Consult your
local dealer about the availability of maintenance contracts.
Routine maintenance should include the following:
• Inspect and clean or replace air filters at the beginning
of each heating and cooling season, or more frequently
if required.
• Inspect the condensate drain and outdoor coil at the
beginning of each cooling season. Remove any debris.
Clean the outdoor coil and louvers as necessary using
a mild detergent and water. Rinse thoroughly with water.
• Inspect the electrical connections for tightness at the
beginning of each heating and cooling season. Service
as necessary.
cauTion:
The unit should never be operated without a
filter in the return air system. replace disposable
filters with the same type and size.
• Do not add additional oil to motors unequipped with oil
tubes. The compressor is hermetically sealed at the
factory and does not require lubrication.
7
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