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STEP 4.
CONNECT HOSE FROM REFRIGERANT CHARG-
ING MANIFOLD LOOSELY TO SUCTION
SERVICE VALVE.
OPEN REFRIGERANT
DRUM SHUTOFF VALVE SLIGHTLY TO PURGE
HOSE.
TIGHTEN CONNECTION AT SERVICE
VALVE.
OPEN REFRIGERANT SHUTOFF
VALVE.
NOTE:
REFRIGERANT DRUM MUST BE IN UPRIGHT
POSITION TO ALLOW ONLY GASEOUS RE-
FRIGERANT TO ENTER SYSTEM.
STEP 5.
CLOSE THE DRUM SHUTOFF VALVE WHEN
THE DISCHARGE PRESSURE GAGE REACHES
10 PSIG.
CLOSE SUCTION SERVICE
VALVE AND DISCONNECT HOSE FROM
VALVE.
Figure 6-4
b. Connect a 0 to 400 psi pressure gauge to suc-
tion service valve loosely, using a hose with valve
core depressor. Purge hose and tighten connec-
tion at service valve.
c. Connect a 0 to 600 psi pressure gauge to dis-
charge service valve loosely, using a hose with
valve core depressor. Purge hose and tighten con-
nection at service valve.
ME 4 1 2 0 - 3 0 8 - l 5 / 6 - 4
--Continued.
d. Operate air conditioner with rotary selector
switch (fig. 2-6) set to COOL and thermostat
(fig. 2-6) set to maximum DECREASE.
e. Check indications on suction and discharge
pressure gauges.
f. Compare gauge indications with the normal
operating pressures listed in table 5-2. If normal
operating pressures are not indicated, refer to
6-7
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