Bryant DuraPac 558F Installation & Service Instructions Manual page 24

UNIT
558F
180†
180**
210†
210**
240†
240**
300†
300**
*Approximate fan rpm shown.
†Indicates standard drive package.
UNIT UNIT
558F VOLTAGE
208/230
180
460
208/230
210
460
208/230
240
460
208/230
300
460
LEGEND
BHP — Brake Horsepower
BkW — Brake Kilowatts
*Extensive motor and electrical testing on these units ensures that the full horse-
power (brake kilowatt) range of the motors can be utilized with confidence. Using
Table 15 — Evaporator-Fan Motor Efficiency
MOTOR
HORSEPOWER
5 Hp
7.5 Hp
10.0 Hp
NOTE: All indoor-fan motors 5 hp and larger meet the minimum efficiency
requirements as established by the Energy Policy Act of 1992 (EPACT) effective
October 24, 1997.
XII. BASE UNIT OPERATION
A. Cooling, Units without EconoMi$er
When thermostat calls for cooling, terminals G and Y1 are
energized. The indoor (evaporator) fan contactor (IFC), and
compressor contactor no. 1 (C1) are energized and evaporator-
fan motor, compressor no. 1 and condenser fans start. The
condenser-fan motors run continuously while unit is cooling. If
the thermostat calls for a second stage of cooling by energizing
Y2, compressor contactor no. 2 (C2) is energized and compres-
sor no. 2 starts.
B. Heating, Units without EconoMi$er (If Accessory or
Optional Heater is Installed)
Upon a call for heating through terminal W1, IFC and
heater contactor no. 1 (HC1) are energized. On units
equipped for 2 stages of heat, when additional heat is
needed, HC2 is energized through W2.
C. Cooling Units with EconoMi$er
When the OAT is above the ECON SP set point and the room
thermostat calls for Stage 1 cooling (R to G + Y1), the indoor-fan
motors (IFM) is energized and the EconoMi$er damper modu-
lates to minimum position. The compressor contactor and OFC
are energized to start the compressor and outdoor-fan motor
(OFM). After the thermostat is satisfied, the damper modulates
to the fully closed position when the IFM is deenergized.
Table 13 — Fan Rpm at Motor Pulley Settings*
1 1
0 / 1 1 /
2 2
†† †† †† ††
†† †† †† ††
†† †† 1095 1077
†† †† 1287 1265
†† †† †† ††
†† †† †† ††
†† †† 1283 1269
†† †† †† ††
Table 14 — Evaporator-Fan Motor Performance
MAXIMUM
ACCEPTABLE
CONTINUOUS
BHP*
6.13
6.13
5.90
5.90
8.70
9.50
10.20
11.80
MOTOR EFFICIENCY
(%)
87.5
88.5
89.5
—
MOTOR PULLEY TURNS OPEN
1 1
2 2 / 3 3 /
2
1021 1002 984 965
1200 1178 1156 1134
1058 1040 1021 1002
1243 1222 1200 1178
1151 1132 1114 1095
1369 1347 1325 1303
1247 1225 1203 1182
1551 1524 1497 1470
**Indicates alternate drive package.
††Due to belt and pulley size, pulley cannot be set to this number of turns open.
MAXIMUM
ACCEPTABLE
CONTINUOUS
BkW*
4.57
4.57
4.40
4.40
6.49
7.08
7.61
8.80
your fan motors up to the horsepower (brake kilowatt) ratings shown in this table
will not result in nuisance tripping or premature motor failure. Unit warranty will
not be affected.
NOTE: All indoor-fan motors 5 hp and larger meet the minimum efficiency re-
quirements as established by the Energy Policy Act of 1992 (EPACT) effective
October 24, 1997.
When the OAT is below the ECON SP setting and the room
thermostat calls for Stage 1 cooling (R to G + Y1), the
EconoMi$er modulates to the minimum position when the
IFM is energized. The EconoMi$er provides Stage 1 of cooling
by modulating the return and outdoor air dampers to main-
tain a 55 F supply air set point. If the supply-air temperature
(SAT) is greater than 57 F, the EconoMi$er modulates open,
allowing a greater amount of outdoor air to enter the unit. If
the SAT drops below 53 F, the outdoor air damper modulates
closed to reduce the amount of outdoor air. When the SAT is
between 53 and 57 F, the EconoMi$er maintains its position.
If outdoor air alone cannot satisfy the cooling requirements
of the conditioned space, and the OAT is above the MECH
CLG LOCKOUT set point, the EconoMi$er integrates free
cooling with mechanical cooling. This is accomplished by the
strategies below.
NOTE: Compressors have a two-minute Minimum On and
Minimum Off, which are accomplished by the strategies below.
1. If Y1 is energized, and the room thermostat calls for
Y2 (2-stage thermostat), the compressor and OFC are
energized. The position of the EconoMi$er damper is
maintained at its current value.
2. If Y1 is energized for more than 20 minutes, and Y2 is
not energized (whether or not a 2-stage thermostat is
used), the compressor and OFC are energized. The
position of the EconoMi$er damper is maintained at
its current value.
3. If Y1 is energized, and compressor no. 1 is already
energized (see Step 2) and the room thermostat calls
for Y2, compressor no. 1 continues to operate. If Y2
remains energized for more than 20 minutes, com-
pressor no. 2 is energized.
—
24
1
4 4 / 5
2 2
947 928 910
1112 1091 1069
984 965 947
1156 1134 1112
1077 1058 1040
1281 1259 1237
1160 1138 1116
1443 1415 1388
MAXIMUM
ACCEPTABLE MAXIMUM
OPERATING AMP DRAW
WATTS
5,180
5,180
5,180
5,180
7,915
8,640
9,510
11,000
1
5 / 6
2
891 873
1047 1025
928 910
1091 1069
1021 1002
1215 1193
1095 1066
1361 1332
15.8
7.9
15.8
7.9
22.0
13.0
28.0
14.6