Trane TKD User Manual

10 RT-SVX42B-E4
Operation
Service Test Guide for Component Operation
Test and setup of the ERM is performed during the first two steps of the rooftop test sequence.
Step 1 of the test simulates normal ventilation mode of the unit.
Step 2 of the test simulates free cooling mode.
During step 1, adjust the return air damper position by turning the minimum position potentiometer on the Economizer module (ECA).
In case of plate heat exchanger version (PHE) adjust the exhaust fan speed minimum reference by changing the corresponding parameters. See
Exhaust Fan Setup section in this manual.
Heat Recovery Wheel (ERW)
Step Mode Indoor Fan
Economizer
module
Exhaust fan
speed
ERW motor
Return air
mixing damper
1 Fan On ON Minimum Nominal ON Minimum
2 Econ. Free cooling ON 100% Open Nominal O Closed
Plate Heat Exchanger (PHE)
Step Mode Indoor Fan
Economizer
module
Exhaust fan
speed
Plate heat ex-
changer by-pass
damper
Return air
mixing damper
1 Fan On ON Minimum Minimum OFF Minimum
2 Econ. Free cooling ON 100% Open Maximum By-pass Closed
If the damper actuator is operating in the opposite way as it should be, reverse the direction of the rotation selector switch as shown in figure
below.
Figure 10a - Damper actuator direction
1
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Trane TKD Specifications

General

Brand	Trane
Model	TKD
Category	Heating System
Language	English