Carrier Streamline Scroll 69NT20-531-300 User Manual

6-7
T -309
n. Place the new service seals (kit item 2) at the com-
pressorserviceports, connectthe fourservice valves
loosely.
o. Torquethefourresilientmountscrewsto6. 2mkg(45
ft--lbs).
p. Torque the four service valves to:
Service V alve Torque
Suction or Discharge 11 to 13.8 m kg
(80 to 100 ft--lbs.)
Economizer 6.9to8.3mkg
(50to60ft--lbs.)
Oil Return 1.4to1.66mkg
(10to12ft--lbs.)
q. Reassemble the top mounting bracket (see
Figure 6-7) by hand tightening the 32--mm (1¼
--inch)bolt andtorquingthefourmountingscrewsto
0.9 mkg (6.5 ft--lbs). Align the mounting so that the
ringandbushingassemblyarefreewithnocompres-
sion.
r. Torquethe32mm bolt to 1.5 mkg (11 ft--lbs.).While
maintaining the free movement of the shock mount,
torque the four mounting screws to 0.9 mkg (6.5 ft--
lbs.).
s. R eplace the power plug O--Ring with new ring (kit
item9).Insertthepowerplugintothecompressorfit-
ting. Be sure plug is fully seated into the fitting and
then thread the coupling nut a minimum of 5 turns.
t. Leakcheckandevacuatethecompressorto 1000mi-
crons. Refer to paragraphs
6.5 and 6.6
u. Run the unit forat least 15minutes andcheck the oil
and refrigerant levels. Refer to paragraphs 6.7 and
6.9.
6.9 COMPRESSOR OIL LEVEL
CAUTION
Use only Carrier Transicold approved
Polyol Ester Oil (POE) -- Mobil ST32 com-
pressoroil with R-134a. Buy in quantitiesof
onequartorsmaller.Whenusingthishygro-
scopic oil, immediately reseal. Do not leave
container of oil open or contamination will
occur.
a. Checking the Oil Level in the Compressor
1 Ideally, ambient temperature should be between
40_F and 100_ F.
2 Operatetheunit in coolingmodeforatleast20min-
utes.
3 C heck the controller function code Cd1 for the suc-
tion modulation valve(SMV) position. It should be
at least 20% open.
4 Locatetheoilsightglassonthesideofthecompres-
sor (item
7, Figure 2-3).
5 TurnStart/Stopswitch offandallowoiltodraininto
compressor sump. Oil level must be visible in the
sightglass.Ifitisnotvisible,oilmustbeaddedtothe
compressor.
b. Adding Oil with Compressor in System
1. The recommended method is to add oil using an oil
pump at the oil return service valve (see item
15,
Figure 2-3
)
2. Inanemergencywhereanoil pumpis notavailable,
oilmaybedrawnintothecompressorthroughtheoil
return service valve.
Connect the suction connection of the gauge man-
ifold to the compressor oil return valve port, and
immersethe commonconnectionofthe gaugeman-
ifold in an open container of refrigeration oil.
Extreme care must be taken to ensure the manifold
common connection remains immersed in oil at all
times.Otherwiseairandm oisturewillbedrawninto
the compressor. Crack the oil return service valve
andgaugevalvetoventasmallamountofrefrigerant
throughthecommonconnectionandtheoil topurge
the lines of air. Cl ose the gauge manifold valve.
With theunit running, turn thesuction servicevalve
toward frontseat and induce a vacuum in the com-
pressor crankcase. Do not allow the compressor to
pull below 127mm/hg (5 “/hg). SLOWLY crack the
suction gauge manifold valve and oil will flow
throughtheoilreturnservicevalveintothecompres-
sor. Add oil as necessary.
3 R un unit for 20 minutesin cooling mode. Check oil
level at the compressor sight glass.
c. Removing Oil from the Compressor:
1 If the oil level is above the sight glass, oil must be
removed from the compressor.
2 Perform a compressor pump down, refer to section
6.4.
3 Removetheoilplug,anddrainoiluntilalevelcanbe
seen in the sight glass.
4 R un unit for 20 minutesin cooling mode. Check oil
level at the compressor sight glass.
6.10 HIGH PRESSURE SWITCH
6.10.1 Replacing High Pressure Switch
a. Turn unit start-stop switch OFF. Frontseat the suc-
tion, discharge, economizer and oil return service
valvesto isolatecompressor. Remove the refrigerant
from the compressor.
b. Disconnect wiring from defective switch. The high
pressure switch is located on the discharge service
valve and is removed by turning counterclockwise.
(See Figure 2-3.)
c. Install a new high pressure switch after verifying
switch settings. (Refer t o paragraph 6. 10.2.)
d. Evacuate and dehydrate the compressor per para-
graph 6. 6.

Carrier Streamline Scroll 69NT20-531-300 Specifications

General

Brand	Carrier
Model	Streamline Scroll 69NT20-531-300
Category	Refrigerator
Language	English