Robinair Model 15448 - Manual (Page 6)

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Troubleshooting guide
Your CoolTech® pump has been designed for
dependable use and long life. If something should
go wrong, however, the following guide will help
you get the pump back into service as quickly as
possible.
If disassembly of the pump is required, please
check your warranty. The warranty may be
voided by misuse or customer tampering which
results in the pump being inoperable.
Failure to start
Check the line voltage. Robinair pumps are
designed to start at +10% line voltage (loaded) at
0
o C. At extremes, however, switching between the
start and run windings may occur. When starting
the pump in cold temperatures, be sure the Iso-
Valve and inlet port are open to free air.
Oil leakage
1. Be sure the oil is not a residual accumulation
from spillage, etc.
2. If leakage exists, the module cover gasket or
the shaft seal may need replacing. Follow the
instructions supplied with the seal replace-
ment kit, part number 15367. If leakage
exists in the area of the drain plug, you may
need to reseal the plug using a commercial
pipe thread sealer.
Failure to pull a good vacuum
1. Be sure the Iso-Valve on the pump is in the
OPEN position and the gas ballast knob is
tightly sealed.
2. Be sure the vacuum gauge and all connec-
tions are in good conditon and leak-free.
You can confirm leakage by monitoring the
vacuum with a thermistor gauge while
applying vacuum pump oil at connections or
suspected leak points. The vacuum will
improve briefly while the oil is sealing the
leak.
3. Be sure the pump oil is clean. A badly
contaminated pump may require several oil
flushes. See OIL CHANGE PROCEDURE.
NOTE: Use only high vacuum pump oil. Other oils
will prevent pull-down to a deep vacuum.
4. Check to be sure the gas ballast knob is
tightly closed.
5. Be sure the oil is at the proper level. For
maximum pump operation, the oil must be
even with the OIL LEVEL line on the sight
glass when the pump is running. See OIL
CHANGE PROCEDURE. Do not overfill —
operating temperatures will cause the oil to
expand so it will appear at a higher level than
when the pump is not running. To check the
oil level, start the pump with the inlet capped.
Check the oil level in the sight glass. Add oil
if necessary.
CoolTech ® pump
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specifications
Model 15424/15448/15444
Frequency Range .................................. 50–60 Hz
Free Air Displacement .................................. 4 cfm
94 l/m @50 Hz
113 l/m @60 Hz
Stages ................................................................. 2
Motor Speed ............................ 1425 rpm @50 Hz
1725 rpm @60 Hz
Voltage Range ...................................... 110–115V
220–250V
Factory Micron Rating .......................... 20 microns
Approximate Oil Capacity ........................... 400 ml
Weight ........................................................ 14.5 kg
Width ......................................................... 14.3 cm
Height ........................................................ 24.8 cm
Length .......................................................... 40 cm
Intake .................................
1 /
4
" MFL and 1 /
2
" Acme
Min. Starting Temp. (at 90% Voltage) ............. 0 o C
Motor Size .................................................... 1 /
3
HP
Capacitor Start
Operating Temp. ........................................... 68 o C
NOTE:
1. All motors are internally protected (automatic
reset).
2. Operating temperatures are typical for
normal operating conditions.
3. Model 15448 has a bipolar side grounded plug.
4. Model 15444 has an Australian plug type
AS3112.
U.S Patents 4,523,897; 5,209.653. Other U.S.
and Foreign Patents Pending.
Because of ongoing product improvements,
we reserve the right to change design,
specifications, or materials without notice.
Operating Manual
6