Airflow Adjustment; Gev/H 0.5 To 5 Tons - Units With Deluxe; 24V Controls - Trane Axiom GEH Series Installation, Operation And Maintenance Manual

Airflow Adjustment

WARNING
Rotating Components!
Failure to disconnect power before servicing could
result in rotating components cutting and slashing
technician which could result in death or serious
injury.
During installation, testing, servicing and
troubleshooting of this product it may be necessary
to work with live and exposed rotating components.
Have a qualified or licensed service individual who
has been properly trained in handling exposed
rotating components, perform these tasks.
Note: GEH/V 6 to 25 ton units only.
To increase cfm, loosen the turns open set screw on the
sheave, and turn the sheave clockwise. To decrease cfm,
Loosen the turns open set screw on the sheave, and turn
the sheave counterclockwise.
To increase belt tension, loosen the adjustment bolt and
pull motor mounting plate back until the belt is tight. Tighten
the adjustment bolt after the belt has reached the desired
tension.
See the figure below for fan motor and sheave adjustment.
Figure 63. Fan motor and sheave adjustment
1. Belt
2. Adjustment bolt and plate
3. Sheave

GEV/H 0.5 to 5 tons - Units with Deluxe

24V controls

For sizes 006-060, the ECM is programmed for constant
torque and delivers airflow similar to a PSC motor while
operating at a higher efficiency.
WSHP-SVX01AC-EN
Figure 64. ECM control box
Figure 65. ECM control board
1. Potentiometer will be used to adjust the PWM output
2. Seven segment display
Using a screwdriver, the potentiometer will be used to
adjust the PWM output from 20% to 100% PWM.
Increasing the PWM will increase the motor speed. When
setting the airflow for air balancing, the high-speed terminal
(GH) must have 24 Vac signal. This will ensure that the
PWM output will be adjusted for the full load airflow.
The display will show the commanded motor speed
percentage. If running on low speed (GL), the low-speed
value will be displayed. If running in GH the high-speed
value will be displayed. If both GH and GL input signals are
present, the PWM output value will be the GH value.
Note: ECM control board is only on units with Deluxe 24V
controls. Tracer® TU is used to adjust fan speed on
units with Symbio™ 400-B/UC400-B controls.
Installation
59