Carrier 38GS - Manual (Page 7)

Do not connect charging hoses to capillary-
controlled system during initial start procedure.
(Loss of charge from this procedure may result in
capacity reduction.) If necessary to add manifold
f • gages for servicing, refer to Carrier Standard
Service Techniques Manual, Chapter 1, pages 1—5,
Fig. 8, for bypass method of returning charge to
system. (A charging hose valve must be used to
accomplish bypass of refrigerant on all units.)
Table 5 — Service Data
CONO
UNIT
R-22
CHG*
(lb—oz)
CONDENSER FAN
Rpm
Diam
(in.)
Cfm
38GS014 3- 0 2600
38GS018 3- 0 2600
38GS024 3- 0 2600
38GS030 3- 2 2600
38GS036 3-M 2600
38GS042 4-12 2800
38GS048 5- 3 2800
38GS060 5- 3 2800
38CC030 3- 2 2600
38CC036 3-14 2600
38CC042 3-12 1060 17/2 2800
38CC048 5- 3 2800
38CC060 5- 3 2800
38CE002 4- 7 2600/2100
38CE003 4-11 1070/870 17/2 2600/2100
38CE004 5- 2 2800/2300
38CE045
38CE005 5- 6
5-11
975/800 17/2
2700/2200
2700/2200
"■Factory refrigerant charge adequate for complete system when
connected to Carrier approved evaporators mat are the same
size as condensing unit, with 25 ft of tubing
COMPRESSOR SERVICE
Unit Single-Phase Compressors of the Split Capaci­
tor (PSC) Type require an equalized system pres­
sure to start. When supply voltage is within 10%
limit and compressor does not start, give com­
pressor a temporary capacitance boost. See Carrier
Standard Service Techniques Manual, Chapter 2,
for details. Use a 130-mfd start capacitor. Connect
wires with insulated probes to each capacitor
terminal. Touch probes to each side of run
capacitor or to compressor motor terminals R and
S. Start compressor; pull probes away after 3
seconds. Discharge start capacitor. Run compressor
for 10 minutes, then shut off and allow system
pressure to equalize. Try restarting without boost
capacitor. If after 2 attempts (without boost
capacitor) the compressor does not start, add an
accessory start capacitor relay package.
Unit Single-Phase Compressors That are Equipped
With a Compressor Start Thermistor (PTC device);
if compressor will not start, check the thermistor
with an ohmmeter as described below. (If evap­
orator coil does not have a bleed-type expansion
device, it may be necessary to remove PTC device
and replace with accessory start capacitor and
relay.)
CHECKING START THERMISTOR
1. Shut off all power to unit and wait 5 minutes
for thermistor to cool to outdoor temperature.
2. Measure resistance of thermistor with ohmmeter.
Normal resistance readings are 50 to 90 ohms at
75 F outdoor temperature.
3. If ohmmeter resistance reading is 0 or much
higher than 90 ohms the thermistor is defective
and must be replaced.
If start thermistor is good and compressor will
not start, disconnect the thermistor from starting
circuit and give compressor a temporary capaci­
tance boost as described above. Run compressor
for 10 minutes, then shut off and allow system
pressure to equalize. Reconnect start thermistor
and try restarting compressor without boost capac­
itor. If after 2 attempts the compressor does not
start, remove thermistor and add an accessory start
capacitor relay package.
38CC Units — Compressor start capacitor and relay
or thermistor (PTC) are not required on 3-phase
38CC units.
Safety Devices — Refer to Table 6 for particular
safety controls that each unit is equipped with.
Table 6 — Compressor Safety Controls
SAFETY CONTROLS
COND
38GS
ENSING 1
38CC ^
NITS
38CE
INTERNAL CURRENT-
TEMP SENSITIVE
OVERLOAD
014,018
024,030
036,042,048
030,036,
042,048
002,003,
004,045,
005
INTERNAL THERMO
(Pilot Duty)
LOW-PRESS. SWITCH
060 060
030, Ò3C
042,048,
060
Accessory
HIGH-PRESS. SWITCH -
030,036,
042,048.
060
-
CRANKCASE HEATER Accessory
030,036,
042,048.
060
Accessory
OUTDOOR FAN
THERMOSTAT
- -
002,003,
004,045,005
TIME G U A R D ® -
030,036,
042
-
CPCS 060 048,060 -
SOLID STATE TIMER - - 045,005
CPCS Compressor Protection Control System
UNIT PROTECTION
Internal Current And Temperature Sensitive Over­
loads
reset automatically when internal motor
temperature drops to a safe level (overloads may
require up to 30 minutes to reset). When an
internal overload is suspected of being open, check
by using an ohmmeter or continuity tester. If
necessary, refer to Carrier Standard Service
Techniques Manual, Chapter 2, for complete
instructions.