9
REFRIGERANT CHARGING
WARNING:
This split system heat pump is shipped charged
with R410A refrigerant and ready for installation.
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.
• To achieve rated capacity and efficiency, the compressor
must be exposed to refrigerant for at least 24 hours
prior to running and then the compressor must be run
for a minimum of 12 hours.
• Cooling mode charging charts and tables are applicable
only to matched assemblies of this equipment and listed
airflows for the indoor coil. Refer to the Quick Reference
Data sheet for additional charging information.
Outdoor units with non-AHRI listed indoor coils are not
recommended and 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. For correct
system charging, refer to
Figure 6 (page 10)
,
Figure
7 (page 11)
,
Figure 8 (page 11)
,
Figure 9 (page
12)
,
Figure 10 (page 12)
,
Figure 11 (page 13)
, &
Figure 12 (page 13)
and
Table 5 (page 14)
,
Table
6 (page 14)
,
Table 7 (page 15)
,
Table 8 (page
15)
,
Table 9 (page 16)
,
Table 10 (page 16)
, &
Table 11 (page 17)
.
• 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. A common suction port for heating mode charging
is included and located on the compressor access
panel above the outdoor unit service valves.
• Heat Mode Verification Tables are provided for quick
reference when the unit is in heating mode and for the
inspection of the liquid line pressures and temperatures.
See
Table 12 (page 19)
,
Table 13 (page 19)
,
Table
14 (page 19)
,
Table 15 (page 19)
,
Table 16 (page
20)
,
Table 17 (page 20)
, &
Table 18 (page 20)
.
• A high-pressure switch is factory-installed and located
in the compressor discharge line internal to the
outdoor unit. The switch is designed to de-energize
the system when very high pressures occur during
abnormal conditions. Under normal conditions, the
switch is closed. If the discharge pressure rises above
575 psig, then the switch will open and de-energize
the outdoor unit. The switch will close again once the
liquid pressure decreases to 460 psig. Please note that
the switch interrupts the thermostat inputs to the unit.
When the switch opens and then closes, there will be
a 5 minute short cycling delay before the outdoor unit
will energize.
Charging the Unit in AC Mode
(With Outdoor Temperatures Above 55° F for Optimized
Sub-Cooling of 10° F to 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
Figure 6
,
Figure 7
,
Figure 8
,
Figure 9
,
Figure 10
,
Figure
11
, &
Figure 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.
