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ESI Outdoor Unit Installation Instruction
05.2018
Manufacturer reserves the right to change at any time for specifications or designs without notice and incurring obligations.
13. System Charge Adjustment
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 on job site, or operation limit to charge by
refrigerant coefficient and sub-cooling method.
13.1 Weigh-in Method
1. Invalid for system with electric heaters or other third-party heaters whose capacity is 1.2 times
of heat pump nominal heating capacity.
For example: 3 Ton condensing unit with a 15KW electric heater.
14/(3*3.516)=1.42>1.2
2. Only take pipe length over 15ft into consideration.
A
B
C
D
Model
Factory
charge
Indoor
Model
Charge amount for
indoor unit(oz)
Charge multiplier for interconnecting
refrigerant tube length *2
2436
The data on
nameplate
<36K
0
0.6 oz/ft
≥36K
14
*1
4860
<60K
0
≥60K
14
*1
For new installation
Calculate additional charge for liquid pipe which is greater than 15 ft.
1. Total pipe length = ft (A)
2. Standard pipe length = 15 ft (B)
3. A minus B = ft (C)
4. Refrigerant multiplier = 0.6 oz/ft (D)
5. Additional refrigerant amount(C*D) = oz (E) *E=0 if pipe length is less than 15ft.
For system repairs
Calculate the total system charge amount.
1. Total pipe length = ft (A)
2. Standard pipe length = 15 ft (B)
3. A minus B = ft (C)
4. Refrigerant multiplier = 0.6 oz/ft (D)
5. Additional refrigerant amount(C*D) = oz (E) *E=0 if pipe length is less than 15ft.
6. Factory charge on nameplate = (F)
7. Total system charge amount = (G)
G=E+F
Table 13-1 Charge amount table
