![background image](http://html.mh-extra.com/html/york/ha090/ha090_technical-manual_947498084.webp)
036-21323-002-C-0206
12
Unitary Products Group
TABLE 13: SUCTION LINES
1 2
Model Designation
Nominal
Capacity
(Tons)
Refrigerant
Flow
Rate
3
(Lbs.
/
Min.
)
Copper Tub-
ing (Inches,
O.
D.
)
Refrigerant
Gas Velocity
(Ft.
/
Min.
)
Friction Loss
4
5
(PSI/
100 Ft.
)
HL-15
4-Pipe System
System # 1
7 1/2
24.6
1 1/8
2050
4.3
1 3/8
1680
1.6
1 5/8
1140
0.7
System # 2
7 1/2
24.6
1 1/8
2050
4.3
1 3/8
1680
1.6
1 5/8
1140
0.7
HL-20
4-Pipe System
System # 1
10
32.5
1 1/8
3500
8.0
1 3/8
2280
2.8
1 5/8
1560
1.2
System # 2
10
32.5
1 1/8
3500
8.0
1 3/8
2280
2.8
1 5/8
1560
1.2
1. All horizontal suction lines should be pitched at least 1 inch every 20 feet in the direction of the refrigerant flow to aid the return of
oil to the compressor.
2. Every vertical suction riser greater than 25 feet in height should have a “P” trap at the bottom to facilitate the return of oil to the
compressor. Use short radius fittings for these traps.
3. Based on Refrigerant-22 at the nominal capacity of the condensing unit, a saturated suction temperature of 45 F and a liquid tem-
perature of 110 F.
4. Although suction lines should be sized for a friction loss equivalent to a 2 F change in saturation temperature (or approximately
3psi), sizing the lines for the proper return of oil is more important.
5. These friction losses do not include any allowances for valves or fittings.
TABLE 14: LIQUID LINES
Model Designation
Nominal
Capacity
(Tons)
Refrigerant
Flow Rate
1
(Lbs.
/
Min.
)
Copper
Tubing
(Inches,
O.
D.
)
Friction
Loss
2 3
(PSI/
100 Ft.
)
Vertical
Rise
(PSI/
Ft.
)
HL-15
4-Pipe System
System # 1
7 1/2
24.6
1/2
11.0
0.5
5/8
3.5
0.5
System #2
7 1/2
24.6
1/2
11.0
0.5
5/8
3.5
0.5
HL-20
4-Pipe System
System #1
10
32.5
5/8
5.8
0.5
3/4
2.3
0.5
System # 2
10
32.5
5/8
5.8
0.5
3/4
2.3
0.5
1. Based on Refrigerant-22 at the nominal capacity of the condensing unit, a saturated suction temperature of 45 F and a liquid tem-
perature of 110 F.
2. The total pressure drop of the liquid line for both friction and vertical rise must not exceed 40 PSI
. I
f the pressure drop exceeds 40
PSI
, the liquid refrigerant could flash before it reaches the expansion valve. This flashing will not only cause erratic valve opera-
tion and poor system performance, but could also damage the expansion valve.
3. These friction losses do not include any allowances for a strainer, filter-drier, solenoid valve, isolation valve or fittings.
http://www.rezine.net
Page 84
Summary of Contents for HA090
Page 42: ...http www rezine net Page 42 ...
Page 59: ...http www rezine net Page 59 ...
Page 60: ...http www rezine net Page 60 ...
Page 63: ...http www rezine net Page 63 ...
Page 70: ...http www rezine net Page 70 ...
Page 97: ...http www rezine net Page 97 ...
Page 98: ...http www rezine net Page 98 ...
Page 100: ...http www rezine net Page 100 ...
Page 103: ...http www rezine net Page 103 ...
Page 110: ...http www rezine net Page 110 ...
Page 158: ...http www rezine net Page 158 ...
Page 166: ...http www rezine net Page 166 ...
Page 167: ...http www rezine net Page 167 ...
Page 169: ...http www rezine net Page 169 ...
Page 172: ...http www rezine net Page 172 ...
Page 179: ...http www rezine net Page 179 ...
Page 182: ...http www rezine net Page 182 ...
Page 206: ...http www rezine net Page 206 ...
Page 207: ...http www rezine net Page 207 ...
Page 209: ...http www rezine net Page 209 ...
Page 212: ...http www rezine net Page 212 ...
Page 219: ...http www rezine net Page 219 ...
Page 222: ...http www rezine net Page 222 ...