CDHH-SVX003C-EN
109
WARNING
Falling Off Equipment!
Failure to follow instructions below could result in a
fall which could result in death or serious injury.
• When working on top of the unit, technicians
MUST use a COMPLETE fall protection system:
an anchor point located on the unit, a connector
(positioning lanyard), and a body harness.
• The anchor point is engineered and rated as
part of a complete fall protection system. It is
the technicians’ responsibility to use a
positioning lanyard and a full body harness with
the anchor.
• Technicians MUST be trained in hazard
recognition and the proper use of personal fall
protection systems.
• ALWAYS inspect the entire fall protection
system for damage before using.
• NEVER modify any part of the fall protection
system for any reason.
WARNING
Hot Surface!
Failure to follow instructions below could result in
severe burns.
Surface temperatures may exceed 300°F (150°C). To
avoid possible skin burns, stay clear of these
surfaces. If possible, allow surfaces to cool before
servicing. If servicing is necessary while surface
temperatures are still elevated, you MUST put on all
Personal Protective Equipment (PPE).
Weekly Maintenance
Perform the following maintenance procedure on a weekly
basis:
1. With the purge unit operating, check the purge tank
condensing activity by observing the liquid refrigerant
flow in the moisture-indicating sight glass located in the
liquid drain line immediately after the filter drier
canister. A lack of visible refrigerant flow in the sight
glass indicates one of the following:
a. A pump-out cycle is necessary.
b. A problem exists with the purge heat transfer circuit
(such as the condensing unit, expansion device, or
purge evaporator coil).
c. A problem exists in the purge control subsystem.
d. Refrigerant vapor from the chiller condenser is
blocked or restricted.
2. Check the moisture-indicator sight glass. Replace the
filter-drier core if moisture is indicated.
Note: The need for frequent changes of the filter drier
could be an indication of significant chiller air or
tube leaks.
Semi-Annual Maintenance
Perform the following maintenance procedure on a semi-
annual basis:
1. Inspect the air-cooled condenser coil and clean as
needed. Clean the coil from the fan side using
compressed air or coil cleaner. A dirty coil will reduce
purge efficiency and capacity.
2. Inspect the purge tank and carbon tank insulation for
any damage or degradation. Make any needed repairs
to the insulation.
Annual Maintenance
Perform the following maintenance procedure on an annual
basis:
1. Semi-annual maintenance procedures described in
“Semi-Annual Maintenance,” p. 109.
2. Open the purge control panel and check all internal
components for such problems as corrosion, terminal
tightness, or signs of overheating.
3. Change the filter-drier assembly.
Inspecting the Moisture Indicator
Monitor the quality of the liquid refrigerant in the chiller by
periodically inspecting the moisture indicator. The indicator
will show “wet” whenever the chiller moisture exceeds the
levels shown in the following table. Notice that the indicator
becomes more sensitive as the temperature decreases.
(The moisture indicator normally operates at equipment
room ambient temperatures.).
A “wet” indication for more than 72 hours typically indicates
that the filter-drier is saturated and should be replaced. In
some cases in which a substantial amount of moisture has
accumulated, such as when the chiller has been serviced,
several filter-drier assembly changes may be required
before a satisfactory moisture level is achieved. A
reoccurring or persistent “wet” indication is a sign of
possible chiller air or water infiltration.
Inspect the moisture indicator only under the following
conditions:
• The chiller is operating.
• The purge unit is operating and has been allowed
sufficient time to properly remove system moisture
(allow a minimum of 72 hours after replacing filter-
drier).
Recommended Maintenance
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