Emerson 2 - Manual (Page 21)

Maintenance
15
6.0 M
AINTENANCE
6.1 Filters
Replaceable evaporator air filter(s) are supplied with the unit. The filter(s) are easily serviceable from
the outside, through the top front access panel.
Filters are usually the most neglected item in an environmental control system. To maintain efficient
operation, they should be checked monthly and changed as required. Units supplied with Economiz-
ers may require replacement filters more frequently because of airborne dust and organic materials.
Filters can be replaced from the front by opening the lower front access panel.
6.2 Blower Package
Periodic checks of the blower package include: blower wheels, housings, motor and motor mounting
bracket. With the power off, inspect and remove any debris from the wheels and housings. Also check
to see that they are tightly mounted on the motor shaft and rotate freely without rubbing against the
housing.
6.3 Economizer - Optional
Each month, the Economizer should be inspected and any debris removed from the intake hood,
damper blade and enthalpy sensor.
6.4 Heat
Heaters can be serviced and/or removed from inside through the discharge opening or from outside by
removing the top.
6.5 Refrigeration System
Each month, the components of the refrigeration system should be inspected for proper function and
signs of wear. Since, in most cases, evidence of malfunction is present prior to component failure, peri-
odic inspections can be a major factor in the prevention of most system failures.
6.5.1 Refrigerant Lines
Check all refrigerant lines and capillaries for vibration isolation, and support as necessary. Visually
inspect all refrigerant lines for leaks.
6.5.2 Discharge Pressure
Discharge pressure can be increased or decreased by load conditions or condenser efficiency. The
high-pressure switch will shut the compressor/contactor at its cut-out setting of 400 PSIG (2758 kPa).
See 5.4.2 - High Pressure (Standard).
!
WARNING
Potentially lethal voltages exist within this equipment during operation. Observe all cautions
and warnings in this manual. Failure to do so could result in serious injury or death. Only
qualified service and maintenance personnel should work with this equipment.
!
WARNING
Power must be OFF while replacing the filter.
!
WARNING
POWER MUST BE OFF WHILE INSPECTING THE BLOWER EQUIPMENT.
!
WARNING
Power must be OFF while working on heaters.