J4AC6 Installation Manual

12
14.2 Liquid line pressure charging and refrigerant
adjustment in cooling (above 55°F outdoor temp.)
The factory charge in the outdoor unit is sufficient for 15 feet of
standard size interconnecting liquid line.
1. Total Line Length (ft)
2. Standard Line set (ft)
3. (a) minus (b)
4. Refrigerant Multiplier
5. Refrigerant Adder (c*d)
*If lineset is less than 15 feet, (e) = 0
New Installations — Calculating additional charge for lineset
greater than 15 feet.
Sealed-System Repairs — Calculating total system charge.
1. Total Line Length (ft)
2. Standard Line set (ft)
3. (a) minus (b)
4. Refrigerant Multiplier
5. Refrigerant Adder (c*d)
6. Factory Charge (nameplate)
7. Total System Charge (e+f)
*If line set is less than 15 feet, (e) = 0
The only mode approved for validating system charge is while in
Cooling Mode. Outdoor Temperature must be between 55°F and
115°F with Indoor Temperature kept between 70°F and 80°F.
Check the outdoor ambient temperatures.
Liquid line pressure (in cooling mode) is the only recommended
method of charging above 55ºF outdoor ambient temperatures.
For outdoor ambient temperatures below 55ºF , use weigh-in charge
method.
Note
:It is important to return in the spring or summer to accurately
charge the system in the cooling mode when outdoor ambient
temperature is above 55ºF.
For 5TON AC unit,the Outdoor Temperature must be between 65°F
and 105°F
For best results the indoor temperature should be kept between 70ºF to
80ºF.
Ensure Sections 7, 8, 9, 10,11,12 and 13 have been completed.
Note:The temperature tolerance for actual approach is ± 3ºF.
Note:The pressure tolerance for actual approach is ± 5psig
1.
Stabilize the system by operating for a minimum of 20 minutes. 3.
2.
Calculate liquid line pressure (According to Refrigerant Charging
Chart)
4.
55ºF
Outdoor Temp.1
115ºF
Outdoor
Temperature
Above 55ºF
55ºF
Outdoor Temp. 2
Outdoor
Temperature
Below 55ºF
Figure 37
80ºF
70ºF
Indoor Temp.
Figure 38
At startup, or whenever charge is removed or added, the system
must be operated for a minimum of 20 minutes to stabilize before
accurate measurements can be made.
20 MIN.
Figure 39
Figure 40
f Measured Suction Line Pressure = ________PSIG
f Outdoor Ambient Temperature = _______ ºF
f Calculate Liquid Line Pressure = ________PSIG
= (a)
= 15 (b)
= (c)
= (d)
= (e*)
= (a)
= 15 (b)
= (c)
= (d)
= (e*)
= (f)
= _