Service Manual

ManualsBrandsAirQuest ManualsMobile Home Air Conditioning5 Ton 13 SEER Air Conditioner with ADP Mobile Home Coil

4. Determine suction line pressure drop from Table 5

(R- 410A) or Table 6 (R- 22).

5. Calculate Pseudo Evaporator Superheat.

S Add the suction line pressure drop to the pressure

reading obtained at suction service valve.

NOTE: For nominal and larger diameter vapor lines with

standard length linesets (vapor line same size as service

valve fitting size and larger with equivalent length less than

80 ft) the pressure drop can be ignored – use vapor service

valve pressure and evaporator outlet temperature to

calculate superheat

S Determine saturated evaporator temperature from

a refrigerant pressure temperature relationship

chart (PT chart).

S Subtract saturated evaporator from evaporator

suction line temperature to obtain evaporator

superheat.

90 STD

90 LONG RAD 45 STD

A01058

Fig. 29 – Tube Fitting Geometry

Table 4—Fitting Losses in Equivalent Feet

TUBE SIZE OD

(IN.)

90 STD (A) 90 LONG RAD (B) 45 STD (C)

1/2 1.2 0.8 0.6

5/8 1.6 1.0 0.8

3/4 1.8 1.2 0.9

7/8 2.0 1.4 1.0

1- 1/8 2.6 1.7 1.3

Table 5—R- 410A System Suction Pressure Drop

Nominal

Size

(Btuh)

Suction Line

(in.)

Pressure

Drop

(psi/100 ft)

Suction

Velocity

fpm

R- 410A Suction Line Pressure Drop (psig)

Total Equivalent Line Length (ft)

20 50 80 100 125 150 175 200 225 250

18000

1/2 9.9 1649 2 5 8 10 12 15 17 20 22 25

5/8 3.1 1018 1 2 2 3 4 5 5 6 7 8

3/4 1.2 678 0 1 1 1 1 2 2 2 3 3

24000

1/2 16.7 2199 3 8 13 17 21 25 29 33 38 42

5/8 5.2 1357 1 3 4 5 7 8 9 10 12 13

3/4 2.0 904 0 1 2 2 2 3 3 4 4 5

7/8 1.0 678 0 0 1 1 1 1 2 2 2 2

30000

5/8 7.8 1696 2 4 6 8 10 12 14 16 18 20

3/4 2.9 1130 1 1 2 3 4 4 5 6 7 7

7/8 1.5 848 0 1 1 1 2 2 3 3 3 4

36000

5/8 10.9 2036 2 5 9 11 14 16 19 22 24 27

3/4 4.1 1356 1 2 3 4 5 6 7 8 9 10

7/8 2.0 1017 0 1 2 2 3 3 4 4 5 5

42000

5/8 14.1 2375 3 7 11 14 18 21 25 28 32 35

3/4 5.4 1582 1 3 4 5 7 8 9 11 12 14

7/8 2.7 1187 1 1 2 3 3 4 5 5 6 7

11/8 0.8 696 0 0 1 1 1 1 1 2 2 2

48000

3/4 6.9 1808 1 3 6 7 9 10 12 14 16 17

7/8 3.5 1357 1 2 3 3 4 5 6 7 8 9

11/8 1.0 796 0 0 1 1 1 1 2 2 2 2

60000

3/4 10.4 2260 2 5 8 10 13 16 18 21 23 26

7/8 5.2 1696 1 3 4 5 6 8 9 10 12 13

11/8 1.4 995 0 1 1 1 2 2 3 3 3 4

Line set application not recommended