Bryant 551C - Manual (Page 54)

54
C06144
Fig. 54 --- Cooling Charging Chart, 551B 048 with
Optional Perfect Humidity Adaptive
Dehumidification System
NOTE: When using the charging charts, it is important that only
the subcooling/reheat dehumidification coil liquid line solenoid
valve be energized. The subcooling/reheat dehumidification coil
liquid line solenoid valve MUST be energized to use the charging
charts and the outdoor motor speed controller jumpered to run the
fan at full speed.
The charts reference a liquid pressure (psig) and temperature at a
point between the condenser coil and the subcooling/reheat
dehumidification coil. A tap is provided on the unit to measure
liquid pressure entering the subcooling/reheat dehumidification
coil.
IMPORTANT: The subcooling mode charging charts (Fig.
53--56) are to be used ONLY with units having the Perfect
Humidity adaptive dehumidification system. DO NOT use
standard charge (Fig. 49--51 and 57--60) for units with Perfect
Humidity system, and DO NOT use Fig. 53--56 for standard
units.
C06145
Fig. 55 --- Cooling Charging Chart, 551B 048 with
Optional Perfect Humidity Adaptive
Dehumidification System
C06146
Fig. 56 --- Cooling Charging Chart, 551B 072 with
Optional Perfect Humidity Adaptive
Dehumidification System
To Use Cooling Charging Chart, Standard Unit
Take the outdoor ambient temperature and read the suction
pressure gauge. Refer to charts to determine what suction
temperature should be. If suction temperature is high, add
refrigerant. If suction temperature is low, carefully recover some
of the charge. Recheck the suction pressure as charge is adjusted.
Example (Fig. 49):
Outdoor Temperature
75°F . . . . . . . . . . . . . . . . . . . . . . . . .
Suction Pressure 70 psig . . . . . . . . . . . . . . . . . . . . . . . . . . .
Suction Temperature should be 48°F . . . . . . . . . . . . . . . . . .
(Suction temperature may vary ± 5°F.)
If a charging device is used, temperature and pressure readings
must be accomplished using the charging charts.
To Use Cooling Charging Charts, Units With
Perfect Humidity™ Adaptive Dehumidification System
Refer to charts (Fig. 53--56) to determine the proper leaving
condenser pressure and temperature.
Example (Fig. 53):
Leaving Condenser Pressure
250 psig . . . . . . . . . . . . . . . . .
Leaving Condenser Temperature 105_F . . . . . . . . . . . . . . .
NOTE: When using the charging charts, it is important that only
the subcooling/reheat dehumidification coil liquid line solenoid
valve be energized. The subcooling/reheat dehumidification coil
liquid line solenoid valve MUST be energized to use the charging
charts and the outdoor motor speed controller jumpered to run the
fan at full speed.
IMPORTANT: Refer to Troubleshooting Tables for additional
information.
Step 6 —Replacement Parts
A complete list of replacement parts may be obtained from any
Bryant distributor upon request.
551B
,C