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ARI* CAPACITY RATINGS (cont)
MULTIPLICATION FACTORS
NOTE:
The following equation converts kW of heat energy to Btuh: kW x 3.413 = Btuh.
EXAMPLE: 26.0 kW (at 240 v) heater on 208 v
= 26.0 (.751 mult factor)
= 19.5 kW capacity at 208 v.
ELECTRIC RESISTANCE HEATER DATA
*Maximum number of stages using accessory low-ambient kit or head pressure control device and low-ambient kit.
NOTE:
Heaters are rated at 208, 240, 480, and 600 v. Use multiplication factors table to determine kW at different voltages.
OUTDOOR SOUND POWER
LEGEND
INDOOR SOUND DATA (TOTAL UNIT)
LEGEND
HEATER RATING
VOLTAGE
ACTUAL HEATER VOLTAGE
200 208 230 240 380 440 460 480 550 575 600
240
0.694 0.751 0.918 1.000 ———————
480
————0.626 0.840 0.918 1.000 ———
600
————————0.840 0.918 1.000
UNIT
551A
HEATER kW
HEATER
STAGES
% HEAT
PER
STAGE
MAXIMUM
STAGES*
MINIMUM
HEATER AMPS
Unit Voltages Heating Cfm
208 230 240 460 480 575 600 Cfm L/s 208 230 240 460 480 575 600
155
14 17 19 14 15 —— 1 100 1
3750 1770
39.3 43.4 45.3 17.2 17.9 ——
26 31 34 30 32 —— 2 50/50 2 71.3 78.9 82.3 37.3 39.0 ——
42 52 56 50 55 —— 2 33/67 3 117.0 129.4 135.0 63.3 66.1 37.0 38.6
180
26 31 34 30 32 —— 250/50 2
3750 1770
71.3 78.8 82.3 37.3 39.0 ——
42 52 56 50 55 —— 2 33/67 3 117.0 129.4 135.0 63.3 66.1 ——
56 69 75 73 80 —— 2 50/50 4 155.9 172.4 179.9 92.0 96.0 ——
551A
RATING
(dB)
A-WEIGHT
(dB)
OCTAVE BANDS
63 125 250 500 1000 2000 4000 8000
155,180
88 87.6 90.8 88.7 86.4 84.3 83.5 78.4 75.6 66.8
dB —
Sound Levels (decibels)
UNIT
551A
SOUND
RATING dB
(60 Hz)
A-WEIGHTED
(dB)
SOUND POWER (dB)
Octave Bands
63 125 250 500 1000 2000 4000 8000
155
88 87.3 87.1 89.9 86.4 84.0 82.7 79.0 73.9 68.6
180
89 88.0 95.7 88.9 87.2 85.2 91.9 79.5 72.7 66.0
dB —
Sound Levels (decibels)
0TFQ004-012
551A155-180