Quick Reference -HVAC (Part-2)
QUICK REFERENCE -HVAC (PART-2)
A.C Capacity
Ton KW H.P 0.64 2.1 0.8 0.80 2.8 1 1.00 3.7 1.25 1.28 4.6 1.6 1.60 5.6 2 2.00 7.31 2.5 2.56 9.35 3.2 3.20 11.6 4 4.00 14.4 5 4.48 16.7 5.6 6.40 22.1 8 8.00 29.1 10 1TON= 1TON=3000 K.Cal/Hr 1TON=1200 BTU/Hr 1TON=3.516 KW 1TON=1.25 HP (VRV / VRF Only) 1TON=4.7 HP 1TON=12660 KJ/Hr
Split AC Copper Pipe Size (Blue Star)
A.C Capacity Suction Pipe Discharge Pipe (Liquid) Up to 1 Ton 12.7mm (1/2″) 6.4mm (1/4″) 1 To 4 Ton 15.9mm (5/8″) 9.5mm (3/8″) 5 To 6 Ton 19.1mm (3/4″) 9.5mm (3/8″) 7 To 8 Ton 22.2mm (7/8″) 12.7mm (1/2″) 9 To 11 Ton 28.6mm (1 1/8″) 12.7mm (1/2″) 12 To 19 Ton 28.6mm (1 1/8″) 15.9mm (5/8″) 20 To 27Ton 34.9mm (1 3/8″) 19.1mm (3/4″) 28 To 42Ton 41.5mm (1 5/8″) 19.1mm (3/4″) Normal Split A.C Copper Pipe Maximum Length = 15Meter VRV System Copper Pipe Maximum Length = 150Meter
Split AC Copper Pipe Length
A.C Capacity Maximum Pipe Length Maximum Indoor & Outdoor Height Difference 0.5 Ton 15 Meter 5 Meter 0.6 Ton 15 Meter 5 Meter 0.75 Ton 15 Meter 5 Meter 1 Ton 20 Meter 10 Meter 1.5 Ton 25 Meter 10 Meter 2 Ton 25 Meter 10 Meter 2.5 Ton 30 Meter 10 Meter 3 Ton 30 Meter 20 Meter 3.5 Ton 30 Meter 20 Meter 4 Ton 30 Meter 20 Meter
Split AC Copper Pipe Additional Refrigerant Charge
Total Pipe Length 50 Meter 60 Meter 70 Meter Additional Refrigerant None 250 gm (25gm/Meter) 500 gm (25gm/Meter)
Copper Pipe Thickness
Pipe Size Thickness Tube Gauge Type 6.4mm (1/4″) 0.8 mm 21 Soft 9.5mm (3/8″) 0.8 mm 21 Soft 12.7mm (1/2″) 0.8 mm 21 Soft 15.9mm (5/8″) 1 mm 19 Soft 19.1mm (3/4″) 1 mm 19 Soft 22.2mm (7/8″) 1 mm 19 Hard 28.6mm (1 1/8″) 1.2 mm 18 Hard 34.9mm (1 3/8″) 1.2 mm 18 Hard 41.5mm (1 5/8″) 1.3 mm 18 Hard De-Oxidized Copper Tubes (DHP) , Copper 99.9% Soft Copper as per ASTM B68 Hard Copper as per ASTM B75 / ASTM280 / BS 2871
Gas Pressure For any Ton Capacity
Refergerent Suction Pressure (PSI) Discharge Pressure (PSI) Standing Pressure (PSI) M/C ON M/C ON M/C OFF R 22 60 To 70 250To 300 156 R 32 120 490 260 R 134A 35 158 To 199 95 R 290 65 275 To 300 125 R 404A 87 270 To 356 190 R 407C 63 247 To 307 153 R 410A 110 To 120 400 To 500 250 R 417A 65 261 140
Nitrogen Pressure Test
Vacuum
3 Minutes 150 PSI <= 500 Micron for 24 Hours 5 Minutes 325 PSI 24 Hours 500 PSI vacuum < 500 Micron
System Problems
System Problem Discharge Line Pressure Suction Line Pressure Suction Line Temperature Compressor Amp Over Gas Charge High ↑ High ↑ Low ↓ (Ice on Suction Pipe) High ↑ Under Gas Charge Low ↓ Low ↓ High ↑ Low ↓ Capillary Block Low ↓ Low ↓ High ↑ Low ↓ Less Air Flow on Evaporator (Indoor Unit) Low ↓ Low ↓ Low ↓ Low ↓ Less Air Flow on Condenser (Outdoor Unit) High ↑ High ↑ High ↑ High ↑ Dirty Condenser (Outdoor Unit) High ↑ High ↑ High ↑ High ↑ Low Ambient Temperature Low ↓ Low ↓ Low ↓ Low ↓ High Ambient Temperature High ↑ High ↑ High ↑ High ↑ Insuffient Compressor Low ↓ High ↑ High ↑ Low ↓
Insulation Thickness
Refrigerant Pipe Insulation Drain Pipe Insulation 22.22mm To 28.58mm 19mm 25mm / 32mm /40mm 6mm 12.7mm To 19.05mm 13mm / 19mm 6.35mm To 9.2mm 9mm / 13mm
Referent Pipe Insulation
Pipe Pipe size Insulation Type (EPDM or NBR) Standard conditions 86°F (30°C), < 85% High humidity conditions(a) 86°F (30°C), >85% Liquid Pipe 1/4″ (6.35 mm) To 3/8″ (9.52 mm) 3/8″ (9 mm) 3/8″ (9 mm) 1/2″ (12.70 mm) To 2″ (50.80 mm) 1/2″ (13 mm) 1/2″ (13 mm) Vapor Pipe 1/4″ (6.35 mm) To 7/8″ (22.23) 1/2″ (13 mm) 3/4″ (19 mm)
The distance between the supports of the copper pipes.
Diameter Distance (m) ≤ 20 mm 1 Meter 20 To 40 mm 1.5 Meter ≥ 40 mm 2 Meter
The permitted length and drop difference
Pipe length Max. pipe length <= 240 Meter Equivalent length from the first branch to the farthest indoor unit <= 40 Meter Drop height Drop height between indoor unit and outdoor unit <= 110 Meter Drop height between indoor units <= 30 Meter
Factory Fabricated
Duct Size Gauge of GI sheet 1 – 900 mm 26 901 -1200 mm 24 1201 -1800 mm 22 1801 – 2100 mm 20 2101 – above 18
Site Fabricated
Duct Size Gauge of GI sheet Upto 750mm 24 750mm- 1500 mm 22 1510 mm- 2250 mm 20 above 2250 mm 18
Horizontal Ductwork
Ducts Size Maximum Spacing Area (m2) Diameter less than 0.4 less than 125 mm 2.5 Meter 0.4 to 1 125 to 1000 mm 2 Meter more than 1 more than 1000 mm 1.2 Meter
Vertical Ductwork
Ducts Type Maximum Spacing (Meter) round 3.6 Meter rectangular 3 Meter
Rectangular Duct Sheet Thickness as per CPWD
Longest side (mm) Minimum sheet thickness Galvanized Sheet Steel (GSS) IS: 277 For Aluminum IS:737 750 mm and below 0.63mm (22 Gauge) 0.8mm (20 Gauge) 751 mm to 1500 mm 0.8mm (20 Gauge) 1mm (18 Gauge) 1501 mm to 2250 mm 1mm (18 Gauge) 1.5 mm (15 Gauge) 2251 mm & above 1.25mm (16 Gauge) 1.8 (13 Gauge)
Round Duct Sheet Thickness as per CPWD
Longest side (mm) Minimum sheet thickness Galvanized Sheet Steel (GSS) IS: 277 For Aluminum IS:737 150 mm to 500 mm 0.63mm (22 Gauge) 0.8mm (20 Gauge) 501 mm to …