Robinair 15434 - Manual (Page 10)

9
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 Check the line voltage. Robinair pumps are designed to start at +10%
To Start line voltage (loaded) at 32 o F. 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 replacement
kit, part number 15367. If leakage exists in the area of the oil drain
plug, you may need to reseal the plug using a commercial pipe thread
sealer.
Failure To 1. Be sure the Iso-Valve on the pump is in the OPEN position and the
Pull A Good gas ballast knob is tightly sealed.
Vacuum
2. Be sure the vacuum gauge and all connections 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 connec-
tions 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.