Maintenance
15 Maintenance
WARNING
Personal Injury Hazard
Servicing of this equipment can be hazardous due to system
pressur
e and electrical components. Only trained and
qualified personnel should install, repair, or service the
equipment.
DANGER
Electric Shock
Before performing service or maintenance operations on the
system, tur
n OFF main power to the unit. Electrical shock will
cause personal injury or death.
15.1 Filter Changes
Filter changes or cleaning are required at regular intervals. The
time period between filter changes will depend upon type of
environment where the equipment is used. In a single-family
home that is not under construction, changing or cleaning the
filter every 60 days is sufficient. In other applications such as
motels where daily vacuuming produces a large amount of lint,
filter changes may need to be as frequent as bi-weekly.
NOTICE
Equipment should never be used during construction due to
likelihood of wall board dust accumulation in the air coil of the
equipment that permanently affects the performance and
may shorten the life of the equipment.
15.2 Annual Checkup
An annual “checkup” by a trained and qualified HVAC mechanic is
required. Complete the check-out sheet on page #82 when
performing the annual maintenance checkup. Record the
perform
ance measurements of volts, amps, and water
temperature differences for both heating and cooling. This data
should be compared to the information on the unit’s data plate
and the data taken at the original startup of the equipment.
15.3 Annual Condensate Drain Cleaning
Clean and flush the condensate drain annually to ensure proper
drainage.
15.4 Blower Motor Lubrication (Optional)
Lubrication of the blower motor is not required; however, may be
performed on some motors to extend motor life. Use SAE-20
non-detergent electric motor oil.
15.5 Handling Periodic Lockouts
Periodic lockouts almost always are caused by air or water flow
problems. The lockout (shutdown) of the unit is a normal
protective measure in the design of the equipment. If continual
lockouts occur call a mechanic immediately and have them check
for:
• water flow problems
• water temperature problems
• air flow problems, or
• air temperature problems.
Use of the pressure and temperature charts for the unit may be
require
d to properly determine the cause.
15.6 Installing Fan Motor Sheaves
When substituting field-supplied sheaves for factory-supplied
sheaves, only the motor sheave should be changed.
To install sheaves on the fan or motor shaft:
1. Isolate power to the unit. (Always follow your Lock-out/Tag-
out procedure.)
2. Remove side unit access panel(s).
3. Remove any rust-preventive coating on the fan shaft.
4. Make sure the shaft is clean and free of burrs.
5. Add grease or lubricant to bore of sheave before installing.
6. Mount sheave on the shaft. To prevent bearing damage, do
not use excessive force.
7. After 1 to 3 minutes of operation, check the belt tension.
Also check tension frequently during the first 24 hours of
operation and adjust if necessary. Periodically check belt
tension throughout the run-in period, which is normally the
initial 72 hours of operation.
NOTICE
Every factory-assembled fan, shaft, and drive sheave
assembly is precision aligned and balanced. If excessive unit
vibration occurs after field replacement of sheaves, the unit
should be rebalanced.
To change the drive ratio, follow the steps in section 15.7.2
Evaporator Fan Performance Adjustment on page #35.
34 |
EC Series Heat Pumps — 8733841499 (2024/05)
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