Trane 4TCY4024, Installer'S Manual

                                                           Page 21

Installer’s Guide

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

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 

DIP 

SWITCHES

CFM FAN

R W3  W2  W1

Y  Y LO

J

21C800796P01

CNT03600

Figure 21. ECM Fan Control