22
RT-SVX50F-EN
Pre Start
Verifying Proper Air Flow (Units
with Belt Drive Indoor Fan)
Much of the systems performance and reliability is closely
associated with, and dependent upon having the proper
airflow supplied both to the space that is being
conditioned and across the evaporator coil.
The indoor fan speed is changed by opening or closing the
adjustable motor sheave.
Before starting the SERVICE TEST, set the minimum
position setpoint for the economizer to 0% using the
setpoint potentiometer located on the Economizer Control
(ECA), if applicable.
Electromechanical Controls
Test Procedure
See unit schematic for correct wire numbers.
Fan Test and Minimum Ventilation.
Connect red
thermostat wire (R) to black thermostat wire (G).
Economizer Cooling.
Connect a jumper wire across
OAT on Economizer Control (ECA).
Connect red thermostat (R) wire to yellow thermostat wire
(Y1).
Cool 1.
Connect red thermostat wire (R) to yellow
thermostat wire (Y1).
Cool 2.
Connect red thermostat wire (R) to yellow
thermostat wire (Y2).
Heat 1.
Connect red thermostat wire (R) to brown
thermostat wire (W1).
Heat 2.
Connect red thermostat wire (R) to brown
thermostat wire (W2).
