22 SRUB-IOM001-EN
Maintenance
Maintenance
The following maintenance procedures are given as an
essential part of the required maintenance of the required
maintenance or this equipment. However, the services of a
qualified service technician are required to perform the
periodic maintenance procedures as a part of a regular
maintenance contract.
WARNING : Disconnect power source and
allow all rotating equipment to stop completely before
servicing or inspecting the unit. Failure to do so may result
in injury or death.
Weekly Maintenance
❑ Check the liquid line sight-glass. Presence of bubbles
indicates possible shortage of refrigerant or dirty liquid line
filter driers.
❑ A noticable temperature drop across the filter driers (more
than 5 deg. F) indicates dirt or obstruction in the filter
driers. Replace filter drier if necessary.
Monthly Maintenance
❑ Inspect unit air filters. Clean or replace if filters are dirty
and blocking air flow.
❑ Inspect coils for excess moisture or icing. Icing may be due
to restricted air flow or shortage of refrigerant flow across
the coil.
❑ Check condensate flow though drainpipe. Remove any
obstructions or algae if found.
❑ Check tension and condition of fan belts.
Six Month Interval
❑ With power disconnected, manually rotate the fan wheel to
check for obstructions in the housing.
❑ Check alignment of fan assemble sheaves. Tighten setscrews
for their proper torques.
Note : Belt tensions should be checked and adjusted at
least twice during the first few days of new belt operation.
Annual Maintenance
❑ Check and tighten all setscrews, bolts, locking collars and
sheaves.
❑ Inspect, clean and tighten all electrical connections.
❑ Inspect the TXV sensing bulbs for cleanliness, good
contact with suction line and insulated from ambient.
❑ Check superheat setting of TXV. It should be 12 F to 17 F.
❑ Drain the condenser water system and thoroughly inspect
for fouling. Clean the condensers.
Required Unit Service Envelope
The following summarizes the envelope around each unit size
which is required for proper service access. The assumption
in establishing these service envelopes are listed below:
1. Service envelopes shown are assumed to be the absolute
minimum space required to service a unit. It is suggested
that unit-to-wall clearance on all sides: this will allow easier
access to all components for general unit servicing.
2. Room for general maintenance of fans and refrigerant
components was considered. Also the minimum room
required to remove fans, fan motors and compressor
servicing is considered. Cleaning of the condenser
waterside tubes must be accomplished by the use of a
chemical cleaning machine.
3. The clearance specified on the unit control panel side is the
clearance which is required for general unit servicing and
not that which is required by local electrical codes.
4. Refer to the dimension data for recommended clearance.
Change/Clean Filters
Change or clean air filters at least twice a year. Filters will be
required more frequent care under high load conditions or
dirty air. A clogged air filters reduces airflow, cooling capacity
and increases energy usage.
To clean permanent filters, remove the filter media and wash
it in water to remove dust, dirt and lint; allow to dry thoroughly
before re-installing in the units. Do not rub or wring.
Permanent filters can also be cleaned by blowing with
compressed air in opposite direction of filter airflow.
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