Nortek Reznor VRA20-4E Installation, Commissioning, Servicing

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Nortek Reznor VRA20-4E Installation, Commissioning, Servicing Manual pdf 4 page image

1712VRA‐4EGBEN, pag.. 4/25VRA-4E 12 20 30 35 45 50 60 75 100 120 145Quantity 5 5 6 8 10 8 8 10 12 10 12mm 1,5 2,1 2,1 2,2 2,2 2,4 2,7 2,7 2,9 3,4 3,4marking 150 210 210 220 220 240 270 270 290 340 340Burner pressure (mbar) (1) 8,1 8 7,25 7,1 6,9 9,2 8,5 8,3 7,5 9,2 9Injector sizeTECHNICAL DATA2.1 SpecificationsTable 1VRA-4E 12 20 30 35 45 50 60 75 100 120 145Gas categoryComb. Air & Flue, type B (1)Comb. Air & Flue, type C (1)Connection collars mm 80 100 100 130 130 130 130 130 130 130 130Heat input Hs kW 13,33 26,42 31,63 43,95 54,38 61,08 73,25 87,85 114,87 144,81 165,47Heat input Hi kW 12,00 23,80 28,50 39,60 49,00 55,00 66,00 79,15 103,50 130,40 149,00Heat output kW 11,14 21,82 25,99 36,23 44,64 50,77 60,92 73,13 94,50 119,32 137,39Thermal Efficiency % 93,00 92,00 91,00 92,00 91,00 92,00 92,00 92,00 91,00 92,00 92,00m³/h 1,27 2,52 3,02 4,19 5,19 5,82 6,98 8,38 10,95 13,80 15,77Gas consumption G25 m³/h 1,48 2,93 3,51 4,87 6,03 6,77 8,12 9,74 12,74 16,05 18,34Gas consumption G31 kg/h NA 1,86 2,22 3,09 3,82 4,29 5,15 6,17 8,24 10,17 11,62Gas pipe connection (2)Real temperature rise (3) K 30 31 33 33 31 30 34 29 29 32 35Air flow measured (3) m³/h 1100 2000 2300 3200 4300 5000 5200 7300 8000 10800 11400Nominal motor speed RPM 1380 1260 920 910 920 930 900 890 860 890 890Recommended mounting height (4) m 2,5 3 4 4 4 4 5 5 5 6 6Horizontal throw (5) m 9,5 13 17 24 25 27 30 32 31 38 39Sound Pressure (6) dB(A) 36 42 37 46 45 45 47 48 52 54 56Sound Pressure (7) dB(A) 43 49 44 53 52 52 54 55 59 61 63Electrical service (protection IP20)Total electrical rating W 530 360 250 370 370 540 760 760 850 1730 1730Weight kg 59 59 64 94 99 114 114 126 184 242 279II2H3+B22PC12, C32, C621/2" 3/4"Gas consumption G20230/240V 1N ~ 50HzTable 2: Injector size and burner pressure G20 natural gas (Inlet pressure = 20.0 mbar )Table 2: Injector size and burner pressure G20 natural gas (Inlet pressure = 20mbar)Table 3: Injector size and burner pressure G30/G31 butane/propane (Inlet pressure G30 = 28mbar ‐ G31 = 37mbar)VRA-4E 12 20 30 35 45 50 60 75 100 120 145Quantity 5 6 8 10 8 8 10 12 10 12mm 1,15 1,15 1,15 1,15 1,4 1,5 1,45 1,5 1,95 1,9marking 115 115 115 115 140 150 145 150 195 190butane N.A. 28,1 28,1 28,4 28,14 27,9 27,75 26,96propane 34,20 34,40 36,20 35,90 30,10 35,20 35,40 34,40 30,70 30,60Injector sizeBurner pressure (mbar) (1)1) with open service door2(1) Gas appliance Classifications for approved venting methods based on CEN report CR 1749:2001.(2) There is a difference between the gas connection diameter and the diameter of the supply line. Always use the most adequate diameter of the supply line tominimize the pressure drop through the gas pipes – if necessary, reduce the diameter of the supply line at the inlet of the unit.(3) Figure for isothermal conditions.(4) Height from floor to bottom surface of heater. These are recommendations only. Positioning of the unit heaters for proper performance is applicationdependent. Operation is affected by other air moving equipment in the space, obstructions to the air flow, draughts and/or close proximity to doors orwindows etc. Care should be taken to avoid mounting the heaters above these recommendations unless downturn nozzle options are used as significantstratification may occur resulting in poor floor coverage and higher energy losses through the roof structure.(5) Isothermal conditions at 20°C ambient air temperature, discharge louvre zero deflection, v = 0.5m/s. The air flow will be influenced by the height of thebuilding, mounting height of the unit, ambient temperature & adjustment of the louvers.(6) Sound pressure level in dB(A) in free field conditions, measures at 5 meters from the unit.(7) Sound pressure level in dB(A) measures at 5 meters from the unit with A = 160m² and Q=2