Carrier 50BA - Manual (Page 16)

Air-Cooled Condensers — Periodically inspect and
clean depending on operating conditions. Refer to
Start-Up and Service Instructions pertaining to
air-cooled condenser used.
Sight Glasses — Provided at inlet of each expansion
valve. Units may be field charged by using the sight
glass (see Charging Procedure).
Charging Procedure
UNITS 5 OB A (WATER-COOLED CONDENSER)
— Units are shipped with a full operating charge of
refrigerant. If recharging is necessary (complete
charge lost), weigh in amount of refrigerant as
indicated on unit nameplate and Table 1. If unit
has partial charge, unit may be charged with sight
glass using standard refrigerant charging tech­
niques. Adjust water regulating valve to proper
saturated condensing temperature (168 to 226
psig).
Refrigerant can be added to 50BA008 and 012
units after sight glass is cleared to take advantage
of subcooling feature of these condensers. Add
refrigerant as follows:
50BA008 - 2.5 lbs
50BA012 - 0.5 lbs
The condenser on the 50BA064 unit has a liquid
level test cock. Adding liquid refrigerant to level of
test cock wül provide 12 to 15 F of subcooling.
UNITS 50BB (REMOTE, AIR-COOLED CON­
DENSERS) ^ Units are shipped with holding
charge only. Open suction and discharge line
service valves. Blow holding charge, evacuate and
leak test system. Add sufficient refrigerant vapor
to permit continuous operation after starting unit.
Review Start-Up Instructions. Using standard
refrigerant charging techniques, add refrigerant
required to maintain operating conditions. See
charging chart information supplied with con­
denser. If information is not available, block off
enough of condenser coil to maintain a discharge
pressure of 220 psig and charge to a clear sight
glass.
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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-4SI Supersedes 50BA-3SI Printed in U S A 8-77 PC 111 Catalog No 535-098
Book 1 4
Tab 2a 7b
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