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SS-SVX09A-EN 71
System Pre-Start Procedures
Discharge Air Controller Checkout (Honeywell W7100A)
Note: The following checkout procedure must be performed in its entirety and in the sequence
given.
ƽ WARNING
Hazardous Voltage!
Disconnect all electric power, including remote disconnects before servicing. Follow proper
lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to
disconnect power before servicing could result in death or serious injury.
The W7100A (7U11) discharge air controller can be checked out using a highly accurate digital volt-
ohmmeter and the W7100A accessory tool kit (Trane part # TOL-0101 or Honeywell part # 4074EDJ).
1. Turn all control switches to the “OFF” position to deactivate the Evaporator Fan and the
Mechanical Cooling.
2. Turn the main power disconnect switch for the evaporator fan and condensing unit “OFF”.
3. Disable the mechanical cooling by removing the field installed evaporator fan auxiliary
interlock wire from terminal board 7TB5 terminal 3 inside the unit control panel.
4. At the Discharge Air Controller, in the unit control panel, remove the red dust cover from the
test plug socket at the bottom of the W7100A. Insert the “Test Plug”, from the kit, into the test
plug socket. The test plug overrides most of the built-in time delays for staging the compressors
“On” and “Off”. Refer to the illustration in
Figure 36 for terminal and control dial identification.
Figure 35. Evacuation Time vs. Pressure Rise