Installation Manual
35
ENGLISH
Refrigerant piping installation
◆
The Amount of Refrigerant
The calculation of the additional charge should take account of the length of pipe.
Additional charge (kg(lbs))
Product charge(1unit)(kg(lbs))
=
+
+
+
+
+
+
=
+
Total liquid pipe (m(ft)): Ø22.2mm(7/8inch)
x 0.237 lbs/ft
x 0.178 lbs/ft
x 0.116 lbs/ft
x 0.079 lbs/ft
x 0.041 lbs/ft
x 0.015 lbs/ft
Total liquid pipe (m(ft)): Ø19.05mm(3/4inch)
Total liquid pipe (m(ft)): Ø15.88mm(5/8inch)
Total liquid pipe (m(ft)): Ø12.7mm(1/2inch)
Total liquid pipe (m(ft)): Ø9.52mm(3/8inch)
Total liquid pipe (m(ft)): Ø6.35mm(1/4inch)
+
x 1.1 lbs
Number of installed HR units
CF(kg(lbs)) (Correction factor)
Total amount(kg(lbs))
If a negative result is obtained from
the calculation, no refrigerant needs
to be added.
A
A
B
B
CAUTION
Outdoor unit
HR unit (1EA)
Indoor unit
Ex) 10HP
Additional Charge = A x 0.061 + B x 0.061 + C x 0.061
+ (a+b+c+d+e) x 0.022 + CF
= 40 x 0.061 + 20 x 0.061 + 20 x 0.061
+ (10 x 5) x 0.022 + 0.5(HR)+0(CF)
= 6.48(kg)
Additional Charge = A x 0.061 + B x 0.061 + C x 0.061
+(a + b + c + d + e) x 0.022 + CF
= 131 x 0.041 + 65.6 x 0.041 + 65.6 x 0.041
+ (32.8 x 5) x 0.015 +1.1(HR)+0(CF)
= 14.3(lbs)
A: Ø12.7(1/2), 50m(164ft)
B: Ø9.52(3/8), 10m(33ft)
C: Ø9.52(3/8), 10m(33ft)
D: Ø9.52(3/8),10m(33ft)
E: Ø6.35(1/4), 10m(33ft)
HP(Ton)
8(6.5)
10(8.0)
12(9.5)
14
16(12.5)
18(14.5) 20(16.0)
22(17.5) 24(19.0)
Product Charge(kg(lbs))
CF(kg(lbs))
8
(17.6)
8
(17.6)
8
(17.6)
8
(17.6)
8
(17.6)
16
(35.3)
16
(35.3)
16
(35.3)
16
(35.3)
-1
(-2.2)
0
(0)
1
(2.2)
2
(4.4)
3
(6.6)
-1
(-2.2)
0
(0)
1
(2.2)
2
(4.4)
WARNING
Regulation for refrigerant leakage
: the amount of refrigerant leakage should satisfy the following equation for human safety.
❐
If the above equation can not be satisfied, then follow the following steps.
- Selection of air conditioning system: select one of the next
1. Installation of effective opening part
2. Reconfirmation of outdoor unit capacity and piping length
3. Reduction of the amount of refrigerant
4. Installation of 2 or more security device (alarm for gas leakage)
- Change indoor unit type
: installation position should be over 2m(6.6ft) from the floor (wall mounted type
→
cassette type)
- Adoption of ventilation system
: choose ordinary ventilation system or building ventilation system
- Limitation in piping work
: Prepare for earthquake and thermal stress
WARNING
Refer to model information since the CF value of correction factor differs depending on model.
Total amount of refrigerant in the system
0.44kg / m
3
(0.028(lbs/ft
3
.))
Volume of the room at which indoor unit of the least capacity is installed
