Toshiba R410A, Quick Reference

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Adding refrigerant 06
After finishing vacuuming, exchange the vacuum pump with a refrigerant canister and start additional charging of
refrigerant.
Calculation of additional refrigerant charge amount
Refrigerant charge amount at shipment from the factory does not include the refrigerant for pipes at the local site.
For refrigerant to be charged in pipes at the local site, calculate the amount and charge it additionally.
NOTE
If the additional refrigerant amount indicates minus as the result of calculation, use the air conditioner without
additional 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 charge amount (lbs) = { (Lx × 0.017 lbs/ft)+(Ly × 0.037 lbs/ft)+(Lz × 0.071 lbs/ft) } × 1.3+ 27.5 (lbs)
= { ((a2+d2) × 0.017 lbs)+((L3+a1+b1+c1+d1+b2+c2) × 0.037 lbs)+(L1+L2) × 0.071 lbs } × 1.3+27.5 (lbs)
= { (30 × 0.017 lbs)+(150 × 0.037 lbs)+(135 × 0.071 lbs) } × 1.3+27.5 (lbs)
= 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)
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).
L2
L3
a2 b2 c2 d2
L1
d1
a1 b2 c1
FS unit
Additional refrigerant charge
amount
Liquid pipe outer dia.
Additional refrigerant amount/1ft (lbs)
Ø 1/4”
0.017
Outdoor unit capacity type
072 type
096 type
120 type
144 type
168 type
192 type
216 type
240 type
L1 Ø1/2": 90ft L2 Ø1/2": 45ft L3 Ø3/8":30ft
5.5
20.9
27.5
5.5
23.1
30.8
34.1
37.4
072 type
096 type
120 type
072 type
096 type
096 type
120 type
120 type
—
—
—
072 type
072 type
096 type
096 type
120 type
Adjustment amount of refrigerant
(lbs)
Combined outdoor units
Ø 3/8”
0.037
Ø 1/2”
0.071
Ø 5/8”
0.108
Ø 3/4”
0.168
Actual length of liquid
pipe
(lbs)
= × ×
1.3
+
Additional refrigerant charge
amount per liquid pipe 1ft
[Table 3]
Adjustment amount of
refrigerant
[Table 4]
Table 1
Table 2
Example:
(120 type)
a1 Ø1/4": 30ft b1 Ø3/8": 30ft c1 Ø1/4": 15ft d1 Ø1/4": 15ft
a2 Ø1/4": 15ft b2 Ø3/8": 15ft c2 Ø1/4": 15ft d2 Ø1/4": 15ft