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Table 13 — Accessory/FIOP Static Pressure (in. wg)
LEGEND
NOTES:
1. Heaters are rated at 240 v, and 480 v.
2. The factory assembled horizontal adapter substantially improves
fan performance.
3. The static pressure must be added to external static pressure. The
sum and the evaporator entering-air cfm should then be used in
conjunction with the Fan Performance table to determine blower
rpm, bhp, and watts.
UNIT
551A
HEATER
RATED
VOLTAGE
CFM
ELECTRIC HEATERS
PRESSURE DROP
(kW)
ECONOMI$ER
PRESSURE
DROP
155,180
208/240-3-60
3,750 0.05 (14/19, 26/34) 0.06 (42/56) 0.07 (56/75) 0.03
4,000 0.05 (14/19, 26/34) 0.06 (42/56) 0.07 (56/75) 0.04
5,000 0.07 (14/19, 26/34) 0.08 (42/56) 0.10 (56/75) 0.05
6,000 0.09 (14/19, 26/34) 0.12 (42/56) 0.15 (56/75) 0.07
7,200 0.11 (14/19, 26/34) 0.16 (42/56) 0.20 (56/75) 0.09
7,500 0.12 (14/19, 26/34) 0.17 (42/56) 0.21 (56/75) 0.10
480-3-60
3,750 0.05 (15, 32) 0.06 (55) 0.07 (80) 0.03
4,000 0.05 (15, 32) 0.06 (55) 0.07 (80) 0.04
5,000 0.07 (15, 32) 0.08 (55) 0.10 (80) 0.05
6,000 0.09 (15, 32) 0.12 (55) 0.15 (80) 0.07
7,200 0.11 (15, 32) 0.15 (55) 0.20 (80) 0.09
7,500 0.12 (15, 32) 0.17 (55) 0.21 (80) 0.10
240
208/240-3-60
5,000 0.08 (26/34) 0.11 (42/56) 0.14 (56/75) 0.06
6,000 0.09 (26/34) 0.12 (42/56) 0.15 (56/75) 0.07
7,200 0.11 (26/34) 0.16 (42/56) 0.20 (56/75) 0.09
9,000 0.15 (26/34) 0.19 (42/56) 0.24 (56/75) 0.11
10,000 0.17 (26/34) 0.21 (42/56) 0.26 (56/75) 0.12
11,250 0.20 (26/34) 0.24 (42/56) 0.29 (56/75) 0.14
480-3-60
5,000 0.08 (32) 0.11 (55) 0.14 (80) 0.06
6,000 0.09 (32) 0.12 (55) 0.15 (80) 0.07
7,200 0.11 (32) 0.15 (55) 0.20 (80) 0.09
9,000 0.15 (32) 0.19 (55) 0.24 (80) 0.11
10,000 0.17 (32) 0.21 (55) 0.26 (80) 0.12
11,250 0.20 (32) 0.24 (55) 0.29 (80) 0.14
FIOP —
Factory-Installed Option
Fig. 29 — Perfect Humidity™ Operation Diagram