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Model ERCH-HP Energy Recovery Unit
This unit requires minimal maintenance to operate
properly. To ensure proper operation and longevity, the
following items should be completed. The items in this
list assume a relatively clean air environment, and may
require attention more frequently in a dirty or dusty
area. If this unit contains an indirect gas heater, refer
to the Installation, Operation and Maintenance Manual
provided with the unit for maintenance purposes. A
Certified Technician should complete all refrigerant
systems checks.
Routine Maintenance
Maintenance Frequency:
Monthly
1. External Filter
Check for cleanliness – clean if required
2. Internal Filter
Check for cleanliness – replace if required
3. Condensate Drain (if applicable)
Inspect and clean – rell with water
4. Bearings
Lubricate per the schedule in the Fan Bearings
section
Semiannually
1. Fan Belts
Check for wear, tension, alignment
2. Check for belt wear
Check pulley, bearings, and motor
3. Bearings
Lubricate per the schedule in the Fan Bearings
section
Annually
It is recommended that the annual inspection and
maintenance occur at the start of the cooling season.
After completing the checklist, follow the unit start-
up checklist provided in the manual to ensure the
refrigeration system operates in the intended matter.
1. Lubrication
Apply lubrication where required
2. Dampers
Check for unobstructed operation
DANGER
Electric shock hazard. Can cause injury or death.
Before attempting to perform any service or
maintenance, turn the electrical power to unit to OFF
at disconnect switch(es). Unit may have multiple
power supplies.
CAUTION
Use caution when removing access panels or other
unit components, especially while standing on a
ladder or other potentially unsteady base. Access
panels and unit components can be heavy and
serious injury may occur.
3. Motors
Check for cleanliness
4. Fan Belts
Check for wear, tension, alignment
5. Blower Wheel & Fasteners
Check for cleanliness
Check all fasteners for tightness
Check for fatigue, corrosion, wear
6. Bearings
Lubricate per the schedule in the Fan Bearings
section
7. Door Seal
Check if intact and pliable
8. Wiring Connections
Check all connections for tightness
9. Inspect all coils for cleanliness. Clean if required.
10. Inspect exterior and interior of entire unit for
surface rust. If rust is found, remove rust and coat
the blemished area with an appropriate protectant.
Heat Pump
An annual inspection of the heat pump system by a
licensed refrigeration mechanic is recommended.
1. Inspect entire heat pump for cleanliness.
2. Record performance data for volts, amps and water
temperature differences (both heating and cooling).
3. Compare annual data to recorded start-up data.
Maintenance Procedures:
Lubrication
Check all moving components for proper lubrication.
Apply lubrication where required. Any components
showing excessive wear should be replaced to maintain
the integrity of the unit and ensure proper operation.
Dampers
Check all dampers to ensure they open and close
properly and without binding. Backdraft dampers can
be checked by hand to determine if blades open and
close freely. Apply power to motorized dampers to
ensure the actuator opens and closes the damper as
designed.
Fan Belts
Belts must be checked on a regular basis for wear,
tension, alignment, and dirt accumulation. Premature
or frequent belt failures can be caused by improper
belt tension (either too loose or too tight) or misaligned
sheaves. Abnormally high belt tension or drive
misalignment will cause excessive bearing loads and
may result in failure of the fan and/or motor bearings.
Conversely, loose belts will cause squealing on start-up,
excessive belt flutter, slippage, and overheated sheaves.
Both loose and tight belts can cause fan vibration.