15
Refrigerant charging
waRning:
Single Packaged Heat Pumps are shipped fully
charged with R-410a refrigerant and ready
for installation. when a 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
done by qualified, trained personnel thoroughly
familiar with this equipment. Some local codes
require licensed installation/service personnel
to service this type of 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.
The system refrigerant charge can be checked and
adjusted through the service ports provided at the front
panel. Use only gauge lines which have a Schrader
depression device present to actuate the valve.
noTeS:
•
The unit must be charged while both first and second
stages are operating.
•
The refrigerant charging charts (Figures 13 - 16,
pages 20 & 21) are applicable to listed assemblies of
equipment and at listed airflows for the indoor coil.
charging an R-410a unit in ac mode at outdoor
Temperatures above 65F.
1. With the system operating at steady-state, measure
the liquid refrigerant pressure in psig at the service
valve.
2. Measure the liquid refrigerant temperature in
Fahrenheit at the service valve.
3. For the temperature measured, determine the required
liquid refrigerant pressure from the appropriate
charging charts in Figures 13 - 16.
4. If the pressure measured in step 1 is greater than
the required liquid refrigerant pressure determined in
step 4, then there is too much charge in the system.
Remove refrigerant and repeat steps 1 through 3 until
the system is correctly charged.
System Heating
If the unit has been equipped with optional electric heater
kits, set the thermostat's system mode to EM HEAT and
the fan mode to AUTO. Verify the compressor and outdoor
fan are not energized but that the blower and heaters are.
Feel the air being circulated by the indoor blower and verify
that it is warmer than ambient temperature. Listen for any
unusual noises. If unusual sounds occur, determine the
source of the noise and correct as necessary.
5. If the pressure measured in step 1 is less than the
required liquid refrigerant pressure determined in
step 4, then there is too little charge in the system.
Add refrigerant and repeat steps 1 through 3 until the
system is correctly charged.
charging an R-410a unit in Heating mode
1. Evacuate the refrigerant system.
2. Weigh in the proper charge based on the charge
level noted on the rating plate. Unit charge MUST be
verified in cooling season.
3. Verify the unit is operating properly as outlined in
System Heating.
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 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.
• The motors for the circulating air blower and the outdoor
fan are pre-lubricated at the factory. No further oiling
is required for the life of this product.
