Service Maintenance; Cooling Season; Heating Season; Ecm Fan Motor Adjustments - Trane 4TCY4024 Installer's Manual

Service Maintenance

Cooling Season

To keep the unit operating safely and efficiently, the manufacturer
recommends that a qualified service technician check the entire
system at least once each year or sooner if needed. The service
technician should examine these areas of the unit:
〿
filters (for cleaning or replacement)
〿
motors and drive system components
〿
economizer gaskets (for possible replacement)
〿
safety controls (for mechanical cleaning)
〿
electrical components and wiring (for possible replacement
and connection tightness)
〿
condensate drain (for proper sealing and cleaning)
〿
unit duct connections (to see that they are physically sound
and sealed to the unit casing)
〿
unit mounting support (for structural integrity)
〿
the unit (for obvious unit deterioration)

Heating Season

Complete the following unit inspections and service routines
described at the beginning of each heating season.
〿
Visually inspect the unit to ensure that the airflow required
for combustion and condenser coil is not obstructed from the
unit.
〿
Inspect the control panel wiring to verify that all electrical
connections are tight and that the wire insulation is intact
Installer's Guide

ECM Fan Motor Adjustments

If the airflow needs to be increased or decreased, see the
Airflow Table in the SERVICE FACTS. Information on chang-
ing the speed of the blower motor is in the Blower Performance
Table. Blower speed changes are made on the ECM Fan Control
mounted in the control box. The ECM Fan Control controls the
variable speed motor. There is a bank of 8 dip switches, (See
Figure 21 below), located on the board. The dip switches work
in pairs to match the cooling/heat pump airflow (CFM/TON),
Fan off-delay options and electric heat airflow adjustment. The
switches appear as shown in the Figure below.
CFM
SELECTION
LIGHT
CFM FAN
Figure 21. ECM Fan Control
DIP
SWITCHES
21C800796P01
CNT03600
J
Y Y LO
R W3 W2 W1
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