Adding Refrigerant - Carrier MMY-MAP0724FT9UL Service Manual

Adding refrigerant

After finishing vacuuming, exchange the vacuum pump with a refrigerant canister and start additional charging
of refrigerant.
Calculation of additional refrigerant charge amount
Additional refrigerant charge
amount
Table 3
Liquid pipe outer dia.
Additional refrigerant amount/1ft (lbs)
Table 4
Outdoor unit capacity type
072 type
096 type
120 type
144 type
168 type
192 type
216 type
240 type
Example:
(120 type)
L1
L1 Ø1/2": 90ft
a1 Ø1/4": 30ft
a2 Ø1/4": 15ft
Additional charge amount (lbs) =
Selection of installation place
• The cooling performance may decline considerably when total operating capacity of cooling indoor units is
less than 38 kBtu/h while ambient temperature is below 32°F (0°C).
Actual length of liquid
=
(lbs)
pipe
Ø1/4"
0.017
Adjustment amount of refrigerant
(lbs)
5.5
20.9
27.5
5.5
23.1
30.8
34.1
37.4
L3
L2
a1
a2 b2
L2 Ø1/2": 45ft
b1 Ø3/8": 30ft
b2 Ø3/8": 15ft
×
{ (Lx 0.017 lbs/ft)+(Ly
×
= { ((a2+d2) 0.017 lbs)+((L3+a1+b1+c1+d1+b2+c2)
×
= { (30 0.017 lbs)+(150
= 47.84 lbs
Lx : Actual total length of liquid pipe Ø1/4" (ft)
Ly : Actual total length of liquid pipe Ø3/8" (ft)
Lz : Actual total length of liquid pipe Ø1/2" (ft)
Additional refrigerant charge
×
amount per liquid pipe 1ft
[Table 3]
Ø3/8" Ø1/2" Ø5/8"
0.037 0.071 0.108
Combined outdoor units
072 type
096 type
120 type
072 type
096 type
096 type
120 type
120 type
d1
b2 c1
c2
L3
c1 Ø1/4": 15ft
c2 Ø1/4": 15ft
× ×
0.037 lbs/ft)+(Lz 0.071 lbs/ft) }
×
× ×
0.037 lbs)+(135 0.071 lbs) }
– 14 –
Adjustment amount of
× +
1.3
Ø3/4"
0.168
—
—
—
072 type
072 type
096 type
096 type
120 type
FS unit
d2
Ø3/8":30ft
d1
d2
×
1.3+ 27.5 (lbs)
×
0.037 lbs)+(L1+L2) 0.071 lbs }
×
1.3+27.5 (lbs)
refrigerant
[Table 4]
Ø1/4": 15ft
Ø1/4": 15ft
×
1.3+27.5 (lbs)