Viking Pump TSM420: HL-LL 4925 - Manual (Page 4)

SECTION TSM 420 ISSUE E PAGE 4 OF 18
DANgER !
Include provision for a pressure relief
device in any part of a pump and piping
system that can be valved off and, thus,
completely isolated. Cold liquid ammonia
when isolated will, as it warms up to
room temperature, expand and exert
tremendous pressures which may rupture
the pump or piping unless relieved.
See Viking Technical Service Manual TSM000 for additional
general installation information
Series 4925 pumps are designed for long, trouble free
life under a wide variety of application conditions with a
minimum of maintenance, however the following should be
considered:
1. LUBRICATION - 1.1. Periodic external lubrication should
be applied slowly with a hand gun at all lubrication
fittings
A good quality of general purpose grease is satisfactory
in the majority of cases, however, applications involving
very low temperatures may require other types of
lubricants suggested frequency of lubrication is once
every 500 hours of operation Do not over grease Consult
the factory if you have specific lubrication questions
1.2. Double Mechanical Seal Reservoir: After replacing
seal and/or before letting ammonia into new or rebuilt
pump, fill oil reservoir with one pint of light Refrigeration
Oil
Before opening valves and allowing ammonia to fill the
pump be sure the hand valve on the reservoir, shown in
figure 8, is open
Change the oil in your double seal pump reservoir after
first 200 hours of operation and then every 1000 hours
by the method mentioned below:
A. Stop pump and close hand valve on oil reservoir, see
figure 8.
B. Remove ½ inch NPT oil filler plug in top of reservoir
carefully and allow the small amount of ammonia trapped
in the reservoir to vent
C. Open oil drain plug and allow old oil to drain
D. Replace oil drain plug and fill reservoir with light
Refrigeration Oil to within 1½ inch of the top
(approximately 1 pint)
E. Replace ½ inch NPT oil filler plug in top of reservoir
f. Open hand valve
g. Wait one minute then star the pump and allow it to run
from two to three minutes before the liquid is introduced
onto the pump This will allow the seat to seal itself
properly before the pressure is applied
NOTE: If your pump has an automatic snap on filler valve
arranged similar to that shown in figure 3, it is not necessary
to stop the pump to add oil to the reservoir Merely connect
lubrication pump to automatic filler valve Open manual valve
and fill reservoir with light Refrigeration Oil to approximately
1½ inch from the top Close manual valve and remove
lubrication pump from filler to valve To change oil: proceed
as indicated in steps A thru G except vent pumping chamber
to atmosphere before changing oil
2. END CLEARANCE ADJUSTMENT - After long term
operation it is sometimes possible to improve the
performance of pump, without major repair, through
adjustment of end clearance of the pump Refer to
instruction under thrust bearing Adjustment, page
11, for information regarding this procedure
3. CLEANING THE PUMP - It is good practice to keep the
pump as clean as possible This will facilitate inspection,
adjustment and repair work to help prevent over looking
a covered grease fitting
4. STORAGE - If the pump has to be stored or not used for
an appreciable length of time it should be drained and
a light coat of lubricating and preventive oil should be
applied to the internal parts Lubricate all fittings
fIgURE 3
DANgER !
Be sure ammonia pressure in pump is
not above 5 PSIg when filling reservoir.
If pressure is higher, pumping chamber
should be bled down to reduce pressure
to 5 PSIg or below. (Before bleeding
pump, read SAfE PRACTICES page 4 and
VENTINg THE PUMP page 4). Pressure
above 5 PSIg in the pump may cause inner
seal seat to be unseated or may force the
faces of the inner seal apart allowing any
dirt accumulated around the inner seat to
be forced between the faces. When the
pump is started the seal may leak.
PREVENTATIVE MAINTENANCE
MANUAL VALVE
fILLER VALVE