679948-YTG-A-0111
Unitary Products Group 9
NOTE: Steam rate (lb./hr.) = 1.025 x MBH
CAUTION: Do NOT operate a motor above its nominal HP rating when a unit is equipped with a steam coil acces-
sory. Although these coils are suitable for higher pressures, steam above 25 psig will provide too much heat and
could damage the blower motor.
NOTE: Water Temperature Drop,
F = 2 x MBH/GPM
CAUTION: Do NOT operate a motor above its nominal HP rating when a unit is equipped with a hot water coil accessory. Do not use steam in these hot
water coils.
TABLE 7: STEAM COIL CAPACITY
1
, MBH@2 PSIG
2
STEAM COIL
MODEL
UNIT MODEL CFM
DRY BULB TEMPERATURE OF AIR ENTERING COIL, ºF
10 30 50 70
1NF0451
090
2400 172.2 155.5 139.1 122.4
3000 191.2 172.6 154.3 136.0
3600 207.5 187.1 167.4 147.4
120
3200 196.4 177.6 158.8 140.0
4000 217.3 195.3 175.3 154.8
4800 236.1 212.9 190.4 167.8
1NF0452 180
4800 298.2 268.4 236.7 211.5
6000 329.1 297.0 265.6 234.1
7200 356.4 321.8 287.9 254.0
1NF0453 240
6400 402 364 325 286
8000 464 419 374 330
9600 481 435 388 342
1. These capacities do not include any blower motor heat.
2. Multiply these capacities by the following factors to correct for higher steam pressures.
Steam Pressure, psig 5 10 15 20 25
Capacity correction factor 1.06 1.12 1.19 1.25 1.30
TABLE 8: HOT WATER CAPACITY
1
, MBH
WATER COIL MODEL UNIT MODEL GPM CFM
ENTERING WATER TEMP. MINUS ENTERING AIR TEMP., ºF
70 90 110 130 150
1HW0451
090 15
2400 78.0 101.3 124.7 148.5 169.7
3000 87.7 113.3 139.6 166.6 190.4
3600 95.5 124.0 153.0 182.1 208.1
120 15
3200 90.3 117.1 144.6 172.1 196.6
4000 100.2 130.2 160.7 191.3 218.6
4800 108.3 140.9 174.3 207.5 237.4
1HW0452 180 20
4800 135.5 175.1 215.8 257.4 294.1
6000 150.0 195.0 240.3 285.9 326.6
7200 162.4 210.8 260.4 309.8 354.3
1HW0405 240 35
6400 179 229 280 331 382
8000 199 255 312 369 425
9600 220 282 344 407 469
1. These capacities do no include any blower motor heat.
TABLE 9: PRESSURE DROP VS. GPM
1HW0451
GPM 15 30 45 -
Pressure Drop, PSI .17 .58 1.22 -
1HW0452
GPM 20 40 60 -
Pressure Drop, PSI .20 .67 1.41 -
1HW0405
GPM 15 35 55 75
Pressure Drop, PSI 0.2 0.8 1.5 2.5
TABLE 10: CAPACITY CORRECTION VS. GPM
1HW0451
GPM 30 45 - -
Capacity Correction 1.11 1.15 - -
1HW0452
GPM 40 60 - -
Capacity Correction 1.12 1.17 - -
1HW0405
GPM 15355575
Capacity Correction 0.74 1.00 1.04 1.06
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