Maintenance; Troubleshooting - A & T International 1 Service Manual

Maintenance

Have service and annual maintenance performed by a
qualified service agency. EMI units are designed and
constructed for reliability and long life with minimal
maintenance. To insure peak operating efficiency:
1. Clean air filters on monthly basis: Filter is accessed by
removing air intake access panel.
2.
Clean with vacuum cleaner that has brush attachment
or use garden hose. Allowing dust to collect on
filter will cause unit to lose efficiency and eventually
malfunction.
3.
Vacuum dust from return air grille and coil surface
when cleaning filter.

Troubleshooting

!
WARNING
All service should be performed by a qualified
service technician. Before removing access panels
or control covers to expose moving parts of non-
insulated live electrical components for service,
disconnect all high volt power supplies to both the
indoor unit and outdoor unit. Failure to do so could
result in physical injury and/or electrical shock.
When troubleshooting indoor unit, refer to wiring diagram
supplied with equipment. May be found on on back of
removable return air grill (WCP) or on back of access panel
(CCP ). Please have model and serial number available
when calling.
Number of low volt interconnect conductors is three to six
depending on heating options and or thermostat selection.
Interconnect wire should be at least 18 awg. Refer to unit
wiring diagram for interconnect diagram that matches your
system.
MAINTENANCE AND TROUBLESHOOTING PROCEDURE
For Emi Air Handlers With Unit Mount Infrared Controls
Figure 1
18
Figure 1A
Figure 2
Figure 2A
Figure 2 B