Emerson 2 User Manual

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.

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.

Each month, the Economizer should be inspected and any debris removed from the intake hood, 

damper blade and enthalpy sensor.

Heaters can be serviced and/or removed from inside through the discharge opening or from outside by 

removing the top.

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.

Check all refrigerant lines and capillaries for vibration isolation, and support as necessary. Visually 

inspect all refrigerant lines for leaks.

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).

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.

Power must be OFF while replacing the filter.

Power must be OFF while working on heaters.