AERO® Indoor/Outdoor Small Air Handler 39S: Annual Maintenance

PIPING

Clean the line strainers.
Blow down the dirt leg.
Clean and check operation of steam traps.
Check operation of control valves.
Check the operation of check valves to prevent condensate flowback.
Check operation of thermostatic air vents, if used. A float and thermostatic trap will contain a thermostatic air vent. When the bellows is ruptured, it will fail closed.
Check operation of vacuum breakers.
Check operation of the thermal protection devices used for freeze-up protection.
Steam or condensate should not be allowed to remain in the coil during the off season.This will prevent the formation and build up of acids.

Use a strainer in the supply line and the dirt leg ahead of the trap.
Use a vacuum breaker in the return.
Do not use overhead returns from the coil. A floodback can occur.
An immersion thermostat to control outdoor-air dampers and the fan motor is recommended. This control is activated when the steam supply fails or the condensate temperature drops below a predetermined temperature, usually 120°F.
On low pressure and vacuum systems, the immersion thermostat may be replaced by a condensate drain with a thermal element. This element opens and drains the coil when the condensate temperature drops below 165°F. Note the thermal condensate drain is limited to 5 psig pressure. At greater coil pressures they will not open.

Open or remove filter panel to replace old filter with a new filter. See physical data tables for filter data.

Lubricate in accordance with nameplate attached to motor or with manufacturer’s recommendations included with motor.

Lubricate fan bearings in accordance with manufacturer’s recommendations included with blower