—23—
V. INTERNAL WIRING
Check all electrical connections in unit control boxes; tighten
as required.
VI. CRANKCASE HEATER (Size 300 and Units with Perfect
Humidity™ Dehumidification Package Only)
Crankcase heater(s) is energized as long as there is power to
the unit and the compressor is not operating.
IMPORTANT: Unit power must be on for 24 hours prior to
start-up. Otherwise, damage to the compressor may result.
VII. EVAPORATOR FAN
Fan belt and variable pulleys are factory-installed. See
Tables 13-18 for fan performance data. Be sure that fans
rotate in the proper direction. See Table 19 for air quantity
limits. See Tables 20-22 for static pressure information for
accessories and options. See Table 23 for fan rpm at various
motor pulley settings. See Tables 24 and 25 for Evaporator-
Fan Motor Data and Efficiency. To alter fan performance, see
Evaporator Fan Performance Adjustment section on page 30.
A 3
1
/
2
-in. bolt and threaded plate are included in the
installer’s packet on 579F216-300 units. They can be added
to the motor support channel below the motor mounting
plate to aid in raising the fan motor.
VIII. CONDENSER-FANS AND MOTORS
Condenser fans and motors are factory set. Refer to Con-
denser-Fan Adjustment section on page 31 as required. Be
sure that fans rotate in the proper direction.
IX. RETURN-AIR FILTERS
Check that correct filters are installed in filter tracks (see
Table 1). Do not operate unit without return-air filters.
X. OUTDOOR-AIR INLET SCREENS
Outdoor-air inlet screens must be in place before operating
unit.
XI. GAS HEAT
Verify gas pressures before turning on heat as follows:
1. Turn off manual gas stop.
2. Connect pressure gage to supply gas pressure tap
(see Fig. 13).
3. Connect pressure gage to manifold pressure tap on
gas valve.
4. Turn on manual gas stop and set thermostat to
HEAT position. Adjust set point to several degrees
above the current room temperature to ensure a heat
demand. After the unit has run for several minutes,
verify that incoming pressure is 5.5 in. wg or greater,
and that the manifold pressure is 3.3 in. wg. If mani-
fold pressure must be adjusted, refer to Gas Valve
Adjustment section on page 32.
5. After unit has been in operation for 5 minutes, check
temperature rise across the heat exchangers. See unit
informative plate for correct rise limits of the heat
supplied. Air quantities may need to be adjusted to
bring the actual rise to within the allowable limits.
Table 13 — Fan Performance — 579F180 (Low Heat Units)
LEGEND
NOTES:
1. Standard low-medium static drive range is 891 to 1179 rpm. Alternate high-
static drive range is 1227 to 1550. Other rpms require a field-supplied drive.
2. Maximum continuous bhp is 4.25 and the maximum continuous watts are
3775. Do not adjust motor rpm such that motor maximum bhp and/or watts is
exceeded at the maximum operating cfm.
3. Static pressure losses (i.e., EconoMi$erIV) must be added to external static
pressure before entering Fan Performance table.
4. Interpolation is permissible. Do not extrapolate.
5. Fan performance is based on wet coils, clean filters, and casing losses. See
Table 20 for accessory/FIOP static pressure information.
6. Extensive motor and drive testing on these units ensures that the full horse-
power and watts range of the motor can be utilized with confidence. Using
the fan motors up to the watts or bhp rating shown will not result in nuisance
tripping or premature motor failure. Unit warranty will not be affected.
7. Use of a field-supplied motor may affect wiring size. Contact your local
Bryant representative for details.
AIRFLOW
(cfm)
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
0.20.40.60.81.01.2
Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts
4500 809 1.53 1317 906 1.74 1502 994 1.96 1690 1078 2.18 1882 1156 2.41 2077 1230 2.64 2275
4800 850 1.76 1516 942 1.98 1706 1027 2.20 1899 1107 2.43 2094 1183 2.66 2293 1255 2.89 2495
5100 892 2.01 1733 979 2.24 1928 1061 2.46 2125 1138 2.70 2325 1211 2.93 2528 1281 3.17 2733
5400 934 2.28 1970 1017 2.52 2169 1096 2.75 2371 1170 2.99 2575 1241 3.22 2781 1309 3.47 2990
5700 976 2.58 2225 1058 2.82 2429 1132 3.06 2635 1204 3.30 2843 1272 3.54 3053 1338 3.79 3266
6000 1019 2.90 2500 1096 3.14 2709 1168 3.38 2919 1238 3.63 3131 1304 3.88 3345 1368 4.13 3562
6300 1063 3.24 2795 1136 3.49 3008 1206 3.74 3223 1273 3.99 3439 1337 4.24 3657 — — —
6600 1106 3.61 3111 1177 3.86 3329 1244 4.11 3547 1309 4.37 3767 — — — — — —
6900 1150 4.00 3448 1218 4.26 3670 — — — — — — — — — — — —
7200 —— — —— — —— — —— — —— — —— —
7500 —— — —— — —— — —— — —— — —— —
AIRFLOW
(cfm)
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
1.4 1.6 1.8 1.9 2.0
Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts
4500 1301 2.87 2477 1369 3.11 2683 1434 3.35 2891 1497 3.47 2997 1497 3.60 3103
4800 1324 3.13 2700 1390 3.37 2909 1454 3.62 3120 1515 3.74 3226 1515 3.87 3334
5100 1349 3.41 2942 1413 3.66 3153 1475 3.90 3367 1535 4.03 3475 1535 4.16 3584
5400 13743.71320214373.96341614984.213633——————
5700 14024.04348114634.293699—————————
6000 ———————————————
6300 ———————————————
6600 ———————————————
6900 ———————————————
7200 ———————————————
7500 ———————————————
Bhp — Brake Horsepower
FIOP — Factory-Installed Option
Watts — Input Watts to Motor
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