Charging Requirement With Additional Refrigerant - Toshiba MMU-AP0072H2UL Engineering Data Book

3
Refrigerant piping design
3-4. Charging requirement with additional
refrigerant
After the system has been vacuumed, replace the vacuum pump with a refrigerant cylinder and system with
additional refrigerant.
Calculating the amount of additional refrigerant required
Refrigerant in the system when shipped from the factory
Model
Heat recovery
Refrigerant amount charged in factory
Model
Heat pump
Refrigerant amount charged in factory
When the system is charged with refrigerant at the factory, the amount of refrigerant needed for the pipes at the site
is not included. Therefore, calculate the additional amount needed and add the required amount to the system.
(Calculation of Heat recovery)
Additional refrigerant charge amount is calculated based on the size of liquid pipe at site and its real length.
Additional
refrigerant charge (lbs) =
amount
(Calculation of Heat pump)
Additional refrigerant charge amount is calculated based on the size of liquid pipe at site and its real length.
Additional
refrigerant charge (lbs) =
amount
Table 1
Liquid pipe outer diameter (in)
Additional refrigerant amount/1 ft (lbs)
Table 2
Outdoor unit capacity type
072 type
096 type
120 type
144 type
168 type
192 type
216 type
240 type
288 type
312 type
336 type
Table 3
Outdoor unit capacity type
072 type
096 type
114 type
144 type
168 type
192 type
228 type
MMY-MAP
MMY-MAP
Actual length
×
of liquid pipe
Actual length of liquid
pipe
Ø1/4" Ø3/8"
0.017 0.037
Adjustment amount of refrigerant (lbs)
5.5
20.9
27.5
5.5
23.1
30.8
34.1
37.4
26.4
29.7
33.0
Adjustment amount of refrigerant (lbs)
0724FT9UL, 0724FT6UL, 0964FT9UL, 0964FT6UL,
1204FT9UL, 1204FT6UL
0724HT9UL, 0724HT6UL, 0964HT9UL, 0964HT9UL,
1144HT9UL, 1144HT6UL
Additional refrigerant
charge amount per
liquid pipe 1 ft [Table 1]
Additional refrigerant
× charge amount per
liquid pipe 1 ft [Table 1]
Ø1/2"
0.071
072 type
096 type
120 type
072 type
096 type
096 type
120 type
120 type
096 type
120 type
120 type
3.31
13.23
15.43
0.00
16.53
27.56
27.56
28
25.4 lbs
25.4 lbs
Adjustment amount of
× 1.3 +
refrigerant [Table 2]
Adjustment amount of
+
refrigerant [Table 3]
Ø5/8" Ø3/4"
0.108 0.168
Combined outdoor units
–
–
–
072 type
072 type
096 type
096 type
120 type
096 type 096 type
096 type 096 type
120 type 096 type
Combined outdoor units
072 type
096 type
114 type
072 type 072 type
096 type 072 type
096 type 096 type
114 type 114 type
Ø7/8"
0.235
–
–
–
–
–
–
–
–
–
–
–