JOHNSON CONTROLS
43
SECTION 5 - REPLACEMENT PARTS AND KITS
FORM 50.40-OM1 (713)
ISSUE DATE: 07/17/2013
5
VACUUM PUMP – MODEL CRR-1
Gurgling Noise
The vacuum pump will gurgle to varying degrees un-
der three different conditions of performance:
1. When operating at high pressure as in the begin-
ning of the evacuation cycle.
2. When the oil level in the pump is low.
3. When a large leak is present in the system being
evacuated.
Suction and Discharge Pressure Problems
Leakage, oil contamination, V-belt slippage and low
oil level are four major causes of insufficient suction
or dis charge pressure. If the recovery and/or recycle
system is free from leaks, and unwarranted suction
problems still exist, the pump should be checked. A
simple criterion for the condition of the vacuum pump
is a determination of its ulti mate pressure capability. If
the suction obtainable is very poor, the pump may be
badly contaminated, low on oil or malfunctioning. On
the other hand, if the pressure is only slightly higher
than the guaranteed ultimate pressure of the pump, an
oil change may be all that is required.
FIGURE 12 -
VACUUM PUMP REPLACEMENT PARTS – MODEL CRR-1
LD01114
If the recovery and/or recycle system is free from leaks
and sufficient suction exists, but the discharge pressure
is insuf ficient, there are several sources to the problem.
A simple explanation, there is an insufficient flow of
refrigerant vapor into the vacuum pump. Check to see
that the tubing con necting the suction port to the chiller
is not obstructed. A low oil level or V-belt slippage can
cause the same symp toms. If there is a leak in the oil
case of the vacuum pump, this can also cause insuffi-
cient discharge pressure. If none of these explanations
fit the observations, the pump may be malfunctioning
and should be sent back to a repair facility.
SHAFT SEAL REPLACEMENT
To replace the shaft seal of a pump, drain the oil and
remove the pump pulley and key. Remove the screws
securing the old seal and pry it loose with a screw-
driver or similar wedge, being careful not to mar the
surface of the pump body against which the seal fits.
Discard the seal and its gasket, inspect all surfaces and
repair any damages with a fine abra sive stone. Wipe all
sealing areas clean and place a film of DuoSeal oil on
both the shaft and the inside bore of the new shaft seal.
Using a new gasket, carefully slide the new seal into
position and center it on the shaft. It is not necessary to
apply any sealant to the gasket. Tighten the mounting
screws uniformly and refill the pump with DuoSeal oil.
Follow instructions included in repair kit.
