Carrier 50BA - Manual (Page 8)

except for servicing unit. Unit main power supply
must be on for at least 6 hours after an extended
“power off’ interval before compressor may be
restarted.
Time Guard® Circuit — To prevent compressor
short-cycle, timer prevents compressor from start­
ing for about 5 minutes after shutdown for any
reason. After thermostat closes, compressor will
start in 15 seconds. See unit label diagram for
timer sequence chart for particular unit.
FILL CONDENSER WITH
CLEANING SOLUTION. DO
NOT ADD SOLUTION
MORE RAPIDLY THAN
VENT CAN EXHAUST
GASES CAUSED BY
CHEMICAL ACTION.
2. After unit conditions have stabilized, unit
3 TO 4
CONDENSER
Fig. 6 — Gravity Flow Method
full
Charging the System
UNITS 50BA — Units are shipped with
operating charge. If recharging is necessary:
1. Insert thermometer bulb in insulating rubber
sleeve on liquid line near filter-drier. Add
pressure gage to discharge line near compressor.
subcooling should be:
UNIT '.UrCOOLING*
50BA004 I 25 ± 2 F
50BA006
22 ± 2 F
220 psig
108 F
96 F
12 F
‘Saturated condensing temperature at compressor minus liquid
line temperature
Example:
Head Pressure
Saturated Condensing Temperature
Liquid Line Temperature
Subcooling
(add charge)
3. If subcooling is low, add charge. If subcooling is
high, remove charge.
UNITS 50BB — Units are shipped with holding
charge only. Open suction and discharge line service
valves. Blow holding charge, evacuate and leak test
system. Using standard refrigerant charging tech­
niques, add amount of refrigerant required to main­
tain operating conditions using charging chart (Fig.
8 or Fig. 9).
TEA. - Temperature, Entering Air
Fig. 8 — Charging Chart, 50BB004
#
Fig. 9 — Charging Chart, 50BB006
For replacement items use Carrier Specified Parts.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Tab 18 Form 50BA.BB-5SI Supersedes 50BA,BB-4SI Printed in U S A U77 PC 111 Catalog No 535—082
Book 1
Tab 2a