Section 14. System Charge Adjustment - Lennox LIAC024-180P431 Installation Manual

Section 14. System Charge Adjustment

14.1 charging: weigh-In Method
weigh-In Method can be used for the Initial installation, or anytime a system charge is being replaced. weigh-In Method
can also be used when power is not available to the equipment site or operating conditions (indoor/Outdoor tempera-
tures) are not In range to verify with the subcooling charging method.
A B
Factory
Model
Charge
(The data on
All models
nameplate)
Note:
The factory charge in the outdoor unit is sufficient for 15 feet of standard
size interconnecting liquid line.
Table 19. New Installations — calculating charge using the weigh-In method
1. Measure in feet the distance between the outdoor
unit and the indoor unit and record on (Line 1).
Include the entire length of the line from the servIce
valve to the IDU.
2. Enter the charge multiplier from column C.
3. Muitply the total length of refrigerant tubing (Line
1) tImes the value on step 2. Record the resulting
value.
4. This Is the amount of refrigerant to weigh-in prior
to opening the service valves.
Table 20. Sealed-System Repairs — calculating charge using the weigh-In method.
1. Measure in feet the distance between the
outdoor unit and the indoor unit and record on
(Line 1). Include the entire length of the line from
the service valve to the IDU.
2. Enter the charge multiplIer from cotumn C.
3. MultIply the total length of refhgerant tubing
(Line 1) times the value on (Line 2). Record the
result on (Line 3) of the worksheet.
4. Record the value in column B to Line 4 of the
worksheet.
5. Add the values from step 3, step 4,and record
the resulting value on Line 5. ThIs is the amount
of refrigerant to weigh-in.
Note: The only mode aperoved for setting validating system charge Is using Charging Mode-cooling. Outdoor
Temperature must be between 55
C
charge
multiplier for
interconnecting
refrigerant tube
length
0.6 oz/ft
New Installation weigh-In Method woriksheeto
1. Line Length (ft)
2. value from Column C
3. Refrigerant((Step1-15) x Step2) =
Note:
Refrigerant=0,don't charge.
New Installation weigh-In Method worksheet
1. Line Length (ft)
2. value from Column C
3. (Step1-15) x step 2
4. Factory charge (column B) +
5. RefrIgerant (steps 3+4)
Note:
Refrigerant=factory charge
O F and 120 O F with Indoor Temperature kept between 70
x
If line length is Less than 15 feet ,
x
=
=
If line length is Less than 15 feet ,
16
O F and 80 O F.