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Pfeiffer pumps use precision steel dowels to align everything and are about as simple as is possible in terms of the number of individual components
and the ease of servicing. If the needle and spring pops out, it
is a simple matter to inspect the seat, needle, and spring.
This may not actually be attached to the needle itself
but if it isn't, the needle and spring should pop out when it is removed.
9. Fridge runs too long: In this situation, check out key parts such
as the thermostats or faulty defrost timer. For those who have a self-defrosting unit,
the initial location you should check would be the condenser supporter.
Hernández encourages kids who want to be an astronaut to study
STEM subjects. Safety valve electrical testing (if present)
- If your Duo 1.5A has the "safety valve" feature, there will be a 4 pin connector on the lower right side
of the bulkhead (facing the pump side). This will
confirm whether the vacuum performance is being affected by a defective safety valve.
However, leaving it like this may result in pump oil
being sucked into the vacuum chamber after shutdown and may also
prevent the motor from restarting if the system is under vacuum.
However, I can provide a PDF of the Uno/Duo
1.5 manual if needed. However, this may be why the manual includes complete service info and exploded assembly diagrams - not present on the Pfeiffer models in current production. But they now only have manuals
for pumps still in production. 1992 R100R, transmission 0204810AA1,
VIN WB1048701N0280119, production of 10/15/1991, no groove, and hence no circlip.
The Uno/Duo 1.5A is considered an obsolete model but that doesn't make it any
less useful as long as major repair parts aren't needed.
The complete operation and service manual for the Uno/Duo 1.5A used to be available at the Pfeiffer Vacuum Web site.
The following should apply in general to other model Pfeiffer rotary vane two stage vacuum pumps with obvious changes in the
details. The base pressure of 4 to 5 microns wasn't terrible but is higher than the spec in the manual -
0.66 micron (though I was told by a Pfeiffer repair technician that 2
or 3 microns is really what to expect if everything is perfect.
I've seen requirements as high as 15 Torr or so for some types but 75 to 100 microns is probably more typical for this model.
For an inlet capped with just a vacuum gauge, a few
dozen Torr may be typical. Safety valve vacuum chamber valve inspection and testing (if present) -
Remove any vacuum system components attached to the inlet port.
Protect the inlet flange from tool damage and use a suitable wrench to unscrew it.
If the needle sticks inside, then use an adjustable
wrench to unscrew the entire gas ballast valve assembly.
Gas ballast valve (if present) - Unscrew the knurled valve handle.
Experts are trained to handle such problems and fix problems quite easily.
Toasters, hair strengtheners, hair dryers, Hand blenders,
mini vacuum cleaners, are a few of all of these machines which are utilized on a daily basis
and are susceptible to a lot of wear & tear. A
set of metric hex wrenches, a medium size flat blade screwdriver, an adjustable
wrench, needlenose pliers, and a few other common hand
tools are required. In an air conditioner, the common problem is with
the condenser, if rapidly turned on or off.
If (1) is high but (2) is low or 0, there is a problem with the diodes or
their wiring.
If both voltage are much higher, the solenoid of the safety valve is
open or there is a bad connection in the wiring
to the solenoid. With the pump running, the voltage across pins 1 and 3 should be 3.5 to 4.5 VDC.
There is no need to go behind the connector if the following tests have acceptable results:
- With the pump running, the voltage across pins 2 and 4 should be 4.5
to 5.5 VRMS AC. In most situations, the fridges are repaired on the very same day, but when there are parts to be replaced,
there may me some anticipated delay. From fridges to washers and everything in between, Amana has expanded their range to include a number of
essential home appliances. At JENN-AIR Repair Center, we know
that diagnostics are a huge part of expert home appliance repair.
Whatever the reason, buying a lightly used appliance can be a smart move as long as you know what to look
for and where to look for it. Look for "towers" and horizontal cabinets that
can be stacked in order to take advantage of vertical space.
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