TENNEY ENVIRONMENTAL
Tenney Junior Test Chambers: Models TJR and TUJR, W942, or WF4
Page 38
Only qualified service personnel should ever be permitted to perform any service related
procedure on this chamber!
Frequency of preventive maintenance procedures depends upon how the facility is used and upon other
circumstances. Because of this, a hard and fast schedule of maintenance operations is difficult to present.
Indeed, an inflexible schedule might be suitable for one user, but completely inadequate for another.
Therefore, we have provided periodic figures when to perform maintenance procedures, based on the
average chamber use.
We suggest that you maintain a preventive maintenance log. In this log you will record operating notes,
pressures, temperatures, and electric readings. The log is valuable because it will help maintenance and
service people by documenting long term trends and by showing parameter levels when the chamber is
operating properly.
Since the refrigeration system is sealed and the instruments are solid state, little maintenance is required on
the temperature chamber. However, the following preventive maintenance steps are suggested.
20.1 General Maintenance
All interlocks and safety features should be tested periodically for proper operation.
1. For air-cooled refrigeration systems, inspect the condenser coil for dust or dirt accumulation that would
impede the flow of air. A dirty condenser will decrease system efficiency and drive up compressor
head pressure, causing it to trip out. If necessary, clean with a brush or vacuum cleaner. Frequency of
cleaning depends upon the air quality at the chamber.
Period: approx. every 30 days.
2. For water-cooled refrigeration systems, make sure the condenser water supply is according to the
specifications listed on the Refrigeration Drawing. If a closed-loop water supply system is not utilized
and the water-out port connection is to an open drain, make sure that flow to the open drain is not
restricted. Inadequate flow will decrease system efficiency and drive up compressor head pressure,
causing it to trip out. The water supply pressure must be 40 PSI Delta.
Period: approx. every 30 days.
3. Inspect the chamber door gasket. Check to see if the door seals tightly around its perimeter. Replace
gasket if significant wear is evident. If the gasket doesn't show any sign of wear, check the operation of
the door latch. Adjust the door latch if necessary.
Period: approx. every 30 days.
4. Only after disconnecting all power to the chamber, inspect and clean the conditioner fans / blower
wheels, and the condenser fans (air-cooled units). Make sure they spin freely. Make sure that the
conditioner fans / blower wheels are tight on their shafts.
Period: approx. every 6 months.
5. Only after disconnecting all power to the chamber, clean the evaporator coil in the chamber
conditioning plenum.
Period: approx. every 6 months.
20.0 PREVENTATIVE MAINTENANCE
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