5-7 62-11848
e. If the scale indicates the correct charge has been added, close the liquid line valve on the drum and mani-
fold valves.
f. Backseat the king valve or field coupler attached to the liquid line charging port. Remove the charging hoses
and check charge in accordance with Section 5.6.1.
g. Start the unit and check for non-condensables. Refer to Section 5.7 for more information.
5.6.3 Installing a Partial Charge
There are no partial charges of the Neos 100S unit. If leak is suspected, for instance, all remaining charge should
be removed and a complete charge must be performed and then weighted in after repair.
5.7 CHECKING FOR NON-CONDENSABLES
To check for non-condensables, proceed as follows:
a. Stabilize system to equalize pressure between the suction and discharge side of the system.
b. Check temperature at the condenser and receiver.
c. Check pressure at the king valve access port or the liquid line charging port.
d. Check saturation pressure as it corresponds to the condenser/receiver temperature using the Temperature-
Pressure Chart, Table 5–3.
e. If gauge reading is 3 psig (0.2 Bar) or more than the calculated P/T pressure in step d., non-condensables
are present.
f. Remove refrigerant using a refrigerant recovery system. Refer to Section 5.3.
g. Evacuate and dehydrate the system. Refer to Section 5.5.
h. Charge the unit. Refer to Section 5.6.
5.8 CHECKING AND REPLACING FILTER-DRIER
5.8.1 Checking Filter-Drier
Check for any obstruction of the filter-drier by feeling the inlet and outlet connections of the liquid line on the filter
cartridge. If the temperature of the outlet connection seems lower than the temperature of the inlet connection,
replace the filter-drier.
5.8.2 Replacing The Filter-Drier
Remove refrigerant charge. See Section 5.3. Remove the drier mounting clip, then replace the filter-drier. Follow-
ing drier replacement, evacuate and recharge unit. Refer to Section 5.5 & Section 5.6.
5.9 HIGH PRESSURE (HP1) AND CONDENSER PRESSURE (HP2) SWITCHES
5.9.1 Removing Switch
a. A Schraeder valve is located under each switch to allow removal and installation without removing the refrig-
erant charge.
b. Remove the switch and test in accordance with Section 5.9.2.
c. Replace or reinstall the switch.
5.9.2 Checking Pressure Switch
Do not use a nitrogen cylinder without a pressure regulator. See Figure 5.4. Cylinder pressure
is approximately 2350 psig (160 Bars). Do not use oxygen in or near a refrigerant system as an
explosion may occur.
a. Remove switch as outlined in Section 5.9.1.
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