Carrier 380B - Manual (Page 9)

6. From intersect point, project vertically down­
ward to chart suction pressure line. Compare
chart suction pressure to unit suction pressure
(Step 2).
7. If unit suction pressure is lower than chart pres­
sure, add refrigerant to system until chart
pressure is reached. If unit suction pressure is
higher than chart pressure, remove refrigerant
until chart pressure is reached.
Unit Single-Phase Compressors
COMPRESSORS OF THE SPLIT CAPACITOR
(PSC) TYPE require an equalized system pressure
to start. When supply voltage is within 10% limit and
compressor does not start, give compressor a tem­
porary capacitance boost. See Carrier Standard
Service Techniques Manual, Chapter 2, for details.
STRAINER VAPOR REVERSING " e " COIL ACCUMULATOR
mm.
Compressor Removal
— See Table 7 for com­
pressor information and Fig. 7 for component
location. Shut off power to unit. Remove refrigerant
from unit using refrigerant removal methods de­
scribed in Carrier Standard Service Techniques
Manual, Chapter 1, Refrigerants.
Be sure system pressure is 0 psig before proceeding.
Table 7 — Compressor Data (60 Hz)
UNIT
i
38QB
i
PRODUCTION COMPRESSOR
V/PH
Model*
Oil Recharge
Ounces
i
018 CRA1-0150-PFV 51
1 ""TM""
024
I
208-230/1
MD2314GE 44
1,3
030 I MD3214GE 44
1,3
036,1
MD3514GE 44
042
1
230/1 PC4616BD 64
‘Refer to Service Parts catalog for replacement compressor model
numbers
Follow safety codes. Wear safety glasses and
work gloves. Have quenching cloth available.
CAUTION: Aíuíiwíusííj ititsing h m&á ir? uiüí
^ m 'phm
Oil líífesííg Of damage may result.
1. Remove top cover as described in Installation,
Step 1.
2. Disconnect high- and low-voltage field wiring
and fan motor leads from capacitor and
contactor.
3. Remove screws holding discharge grille in place.
Lift grille from unit.
4. Disconnect compressor leads (crankcase heater,
low-pressure switch, defrost thermostat and
solenoid coil) from electrical components and
pull them thru the wire access opening into the
MUFFLER HOT GAS
DISCHARGE LINE COMPRESSOR
Fig. 7 — Component Location
coil section. Lift fan orifice/control ring after
pinching and pressing down on 3 plastic pins
of tube supports.
5. Remove louvered casing by taking out 16 screws
securing it to the cabinet and sliding it away
from the coil.
6. Using a midget tubing cutter, cut liquid and
discharge lines on the coil and suction and
discharge lines at a convenient place near the
compressor for easy reassembly with copper
slip couplings.
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7. After plugging connections, remove condenser
coil by pinching plastic pins of tube supports
that extend into basepan and lift vertically.
Set coil on a clean, flat surface.
8. Remove compressor holddown bolts and slide
out compressor. Remove crankcase heater.
have ftm extiugaisfeef âïtdior qtjieucbifig
cîoîît m oil vapor igastes,
9. Carefully unbraze suction and discharge line
piping stubs from compressor after noting posi­
tion of stubs to assist when reinstalling.
10. Install new compressor, placing crankcase
heater around compressor. Be sure compressor
holddown bolts are in place.
11. Replace coil; braze suction and discharge lines
to compressor piping stubs (at points where cut.
Step 6); rewire compressor and leak test.
12. Replace fan orifice/control ring; connect com­
pressor wires after feeding them thru control
ring; replace fan/grille assembly and rewire;