Carrier WEATHERMASTER 48/50Z030-105 - Manual (Page 130)

130
Lubrication
COMPRESSORS — Each compressor is correctly charged at
the factory. Refer to 06D and 06E Compressor Service Manu-
als if additional information regarding compressor lubrication
system is required.
FAN SHAFT BEARINGS — Lubricate fan shaft bearings at
least once a year with suitable bearing grease. Extended grease
lines are provided on pulley side of blower. Typical lubricants
are given below:
*Preferred lubricant because it contains rust and oxidation inhibitors.
INLET GUIDE VANE BEARINGS (Units With Optional
Inlet Guide Vanes) — These bearings are oil impregnated.
Lubricate annually with a few drops of nondetergent SAE
(Society of Automotive Engineers) 20 oil.
FAN MOTOR BEARINGS — The condenser-fan and
evaporator-fan motors have sealed bearings so no field lubrication
is required.
DOOR HINGES — All door hinges should be lubricated at
least once a year.
Refrigerant Feed Components — Each refrigerant
circuit (2 per unit) has all the necessary refrigerant controls.
Thermostatic Expansion Valve (TXV) — On sizes
030 and 035, each circuit has one TXV. On size 040 and 050,
each circuit has 2. The superheat is nonadjustable. On sizes
055-105, each circuit has 2 TXVs on which superheat may be
adjusted if necessary. Adjustment is not normally required or
recommended.
The TXV is set to maintain 10 to 13 F superheat leaving the
evaporator coil. It controls the flow of refrigerant to the evapo-
rator coils.
Refrigeration Circuits
LEAK TESTING — Units are shipped with a full operating
charge of R-22 (see unit nameplate). If there is no pressure in
the system, introduce enough nitrogen to search for the leak.
Repair the leak using good refrigeration practices. After leaks
are repaired, system must be evacuated and dehydrated
using methods described in GTAC II, Module 4, System
Dehydration.
REFRIGERANT CHARGE (Refer to Unit Nameplate) — At
the liquid line connection point on each circuit is a factory-
installed liquid line service valve. On each valve is a 1 /
4
-in.
Schrader connection for charging liquid refrigerant.
All units are shipped with a complete operating charge of
R-22. See unit nameplate and for amount of charge. When
adding a complete charge, evacuate system using standard
evacuating procedures and weigh in the specified amount of
charge. All units use the same charging chart. See Fig. 49.
Charging with Unit Off and Evacuated — Close liquid line
service valve before charging. Weigh in charge shown in
unit nameplate. Open liquid line service valve; start unit and
allow it to run several minutes fully loaded. Check for a clear
sight glass. Be sure clear condition is liquid and not vapor.
Complete charging the unit.
Charging with Unit Running — If charge is to be added while
unit is operating, it is necessary to have all condenser fans and
compressors operating. It may be necessary to block condenser
coils at low-ambient temperatures to raise condensing pressure
to approximately 280 psig to turn all condenser fans on. Do not
totally block a coil to do this. Partially block all coils in uni-
form pattern. Charge vapor into compressor low-side service
port located above oil pump crankshaft housing. Charge each
circuit until sight glass shows clear liquid.
Oil Charge — All units are factory charged with oil. Ac-
ceptable oil level for each compressor is shown in Table 96.
When additional oil or a complete charge is required, use
only Carrier-approved compressor oil.
Approved oils are:
Petroleum Specialties, Inc. — Cryol 150A (factory oil charge)
Texaco, Inc. — Capella WF-32-150
Witco Chemical Co. — Suniso 3GS
Do not reuse drained oil, and do not use any oil that has
been exposed to atmosphere as oil is highly hygroscopic and
rapidly absorbs moisture.
ADD OIL — Close suction shutoff valve and pump down
crankcase to 2 psig. (Low-pressure cutout must be jumpered.)
Wait a few minutes and repeat until pressure remains steady at
2 psig. Remove oil fill plug above the oil level sight glass, add
oil through plug hole, and replace plug. Run compressor for
20 minutes and check oil level.
REMOVE OIL — Pump down compressor to 2 psig. Loosen
the 1 /
4
-in. pipe plug at the compressor base and allow the oil to
seep out past the threads of the plug.
NOTE: The crankcase will be slightly pressurized. Do not
remove the plug, or the entire oil charge will be lost.
Small amounts of oil can be removed through the oil pump
discharge connection while the compressor is running.
Table 96 — Oil Charge
MANUFACTURER LUBRICANT
Texaco Regal AFB-2*
Mobil Mobilplex EP No. 1
Sunoco Prestige 42
Texaco Multifak 2
Fig. 48 — Transducer Details
TRANSDUCER
PART
NUMBER
INPUT
RANGE
(in. wg)
OUTPUT
RANGE
OUTPUT
AT 0 IN. WG
USAGE
HK05ZG019 0-5 4-20 mA 4 mA
Supply Duct/
Air Foil
Fan Cfm
HK05ZG020 0-1 4-20 mA 4 mA
Forward
Curved
Fan Cfm
HK05ZG021 0-15 4-20 mA 4 mA
Return/
Exhaust
Fan Cfm
HK05ZG022 –0.25-0.25 4-20 mA 12 mA
Building
Pressure
PRESSURE POR
T
S
LOW
HIGH
S
Z
COM OUT EXC
COMPRESSOR OIL CHARGE (Pints)
06D 10.0
06E 299 19.0
All other 06E 20.0