Grandaire 4860 - System Charge Adjustment; Weigh-In Method

15
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.
Note: The only mode approved for validating system charge is while in Cooling "Charge Mode". Outdoor Temperature
must be between 55
O
F and 120
O
F with Indoor Temperature kept between 70
O
F and 80
O
F.
A C
Model
charge
multiplier for
interconnecting
refrigerant tube
length
0.6 oz/f t
Factory
(The data on
nameplate)
Charge
B
Table 19. New Installations — Calculating additional charge for lineset greater than 15 ft.
1. Total Line Length (ft) = _________(a)
2. Standard Lineset (ft) = 15 (b)
3. (a) minus (b) = _________(c)
4. Refrigerant Multiplier = 0.6 oz/ft (d)
5. Refrigerant Adder (c*d) = _________(e)*
.
* If lineset is less than 15 ft, (e) = 0
Table 20. Sealed-System Repairs — Calculating total system charge.
1. Total Line Length (ft) = _________(a)
2. Standard Lineset (ft) = 15 (b)
3. (a) minus (b) = _________(c)
4. Refrigerant Multiplier = 0.6 oz/ft (d)
5. Refrigerant Adder (c*d) = _________(e)*
6. Factory Charge (namplate) = _________(f)
7. Total System Charge (e+f) = _________
.
* If lineset is less than 15 ft, (e) = 0
All models
Note: The factory charge in the outdoor unit is sufficient for 15 feet of standard
size interconnecting liquid line.