Johnson Controls YC4 Series - Optional Cold Weather Charging

Table 10: R-454B saturation properties
Temperature Liquid pressure Vapor pressure
°F psig psig
100 301 291
105 323 312
110 346 335
115 370 359
120 396 384
125 422 411
130 451 439
135 480 468
140 511 499
Optional cold weather charging
NOTICE
For better airflow, the size of the charging tent must be at least 70 in. x 70 in. x 70 in. and must have
some adjustable flaps or windows to control the temperature inside the charging tent. The charging
tent must not have a floor or floor covering. Follow the system charge procedures from Charging the
system.
About this task:
These optional steps outline how to charge the unit in cold weather using a charging tent.
1. Assemble the charging tent.
2. Slide the charging tent over the top of the outdoor unit.
3. Position the door zipper over the refrigerant piping so the charging tent sits evenly on the
ground.
4. Make sure the distance around the outdoor unit inside of the charging tent is even for
airflow.
5. Stake down the edges of the charging tent cover to prevent the unit fan from blowing the
charging tent away.
6. Start the outdoor unit.
7. For better temperature measurement inside the charging tent, use a thermocouple to
monitor temperature readings. Locate the thermocouple monitor approximately 8 in. to 10 in.
away from the coil guard and 2/3 of the way above the bottom of the coil on the opposite side
from the control box.
8. Based on the outdoor ambient temperature, begin adjusting windows in order to achieve
a stable temperature above 55°F inside the tent. Note that the colder the outdoor ambient
temperature is the fewer windows need removal.
9. Use the outdoor unit charging chart. Verify that the outdoor ambient temperature listed on
the charging chart is the temperature inside the charging tent.
10. Carefully adjust the charging tent windows until reaching the desired temperature, and allow
the unit to stabilize for a minimum of 15 min. Check the thermocouple to make sure the
temperature is still maintained at the preferred temperature. If the temperature is out of
range, adjust the windows by opening or closing them.
11. When the condition inside the charging tent is stabilized, follow the procedures to adjust
charge in the unit.
43Installation Manual: R-454B Outdoor Split-System Air Conditioner
Johnson Controls Ducted Systems