Johnson Controls YORK EASYTANK LD17584, Руководство по эксплуатации и техническому обслуживанию, Страница: 17 / 54

JOHNSON CONTROLS
17
SECTION 2 - OPERATION
FORM 50.40-OM1 (713)
ISSUE DATE: 07/17/2013
2
Gas Pump Out – Refrigeration Unit To Rsr
Storage Vessel
After the liquid refrigerant has been removed from the
refrigerant unit, as previously described, the following
pro cedure is used to remove the remaining refrigerant
gas.
Set the valves and pumps as shown in column 2 of
Table 6 on page 16
. Start the RSR unit by turning
the toggle switch to the ON position.
On units RSR­2212, RSR­2222 and
RP­2200 close compressor suction service
valve so that suction pressure does not
exceed 70 psig.
The RSR unit draws refrigerant vapor from the re-
frigeration unit and condenses same in the RSR water
cooled con denser. The liquefied refrigerant flows to
RSR storage vessel.
WHEN EVACUATING REFRIGERA­
TION UNITS WITH LIQUID CHILLER
AND/OR WATER COOLED CONDENS­
ERS — During the pumpout procedure,
while any remaining liquid refrigerant
is in contact with unit water tubes, care
must be taken to prevent the unit satura­
tion pressure/temperature from dropping
below the freezing temperature of the
water or brine.
The operation should continue until a vacuum of the
value shown in
Table 6 on page 16
exists for the
specified type of refrigera tion unit being evacuated.
During the evacuation process, valve 6
should remain open to evacuate the refrig­
erant hose between valves 6 and 5. When
the system being evacuated reaches the
aforemen tioned vacuum, valve 6 should
be closed to seal off the hose. Valve 7
should be closed prior to turning the
RSR unit off to evacuate the remaining
refrigerant hose.
After the hoses have been evacuated and valves 6 and 7
closed, the RSR unit can be shut off but the hoses must
remain in place. After a waiting period of 5 minutes,
the pressure in the refrigeration unit is to be checked.
If the pressure has risen due to residual refrigerant re-
maining in the refrigeration unit, the Gas Pump Out
procedure must be repeated until a pressure rise is not
detected after a five minute waiting period.
TABLE 7 - FINAL VACUUM/EPA REGULATIIONS
DESCRIPTION
FINAL
VACUUM IN.
HG (KPA)
HCFC-22 unit containing less than 200
Lbs. /91 kg of refrigerant
0 (0)
HCFC-22 unit containing more than
200 Lbs./91 kg of refrigerant
10 (33.9)
Other high pressure units containing
less that 200 Lbs. /91kg of refrigerant
10 (33.9)
Other high pressure units containing
more than 200 Lbs./91 kg of refrigerant
15 (51)
Low pressure units (CFC-11, HCFC-
123 & CFC-114)
25* (98)
*=mm Hg absolute
DETECTION AND REMOVAL OF
NON-CONDENSIBLE GASES
After the RSR unit containing the stored refrigerant
has equalized such that the machine and stored refrig-
erant are at the same temperature as the surrounding
ambient temp erature, the refrigerant can be checked
for non-condensible gases. If the pressure in the stor-
age vessel, as read on the compressor discharge gauge,
exceeds the saturation pressure of the refrigerant at the
ambient temperature by the amount shown in Table 8
on page 18 , there is a need to vent the non-condens-
ible gases from the Schraeder type valve located on the
top of the storage vessel for a period of fifteen seconds.
The procedure should be repeated until the saturation
pressure in the storage vessel is within the pressure
range shown in Table 8 on page 18 for the given re-
frigerant. The storage vessel and contained refrigerant
should be allowed to equalize to ambient temperature
between ventings.
When the refrigerant in the storage vessel reaches a
stable temperature – equal to the surrounding ambi-
ent air temp erature – the pressure in the storage ves-
sel, read on the com pressor discharge gauge, should
be the same as the satura tion pressure for the ambient
temperature. If the pressure reading is higher by the
above values, or more, the storage vessel should be
purged of non-condensable.