![background image](http://html1.mh-extra.com/html/york/33p502-05/33p502-05_installation-manual_3520909018.webp)
18
General
Be sure the available power is the same voltage and phase as that
shown on the unit serial plate. Line and low voltage wiring must be
done in accordance with local codes or the National Electric Code,
whichever is applicable.
Unit Power Connection
Connect the incoming line voltage wires to L1 and L2 of the
contactor for single-phase unit. Consult the Unit Electrical Data for
correct fuse sizes.
Electrical Connections
208 Volt Operation
All Z Series 208/230 units are factory wired for 230 volt operation.
For 208 volt operation, the red and blue transformer wires must be
switched on terminal strip PS.
CAUTION: When installing a unit with an ECM blower
motor in 460/60/3 voltage, a neutral wire is required
to allow proper unit operation.
For Versatec board, set SW1-2 on the printed circuit board for
applications using a closed loop antifreeze solution to “LOOP”
(15°F) [-9.4°C]. On applications using an open loop/ground water
system (or closed loop no antifreeze), set this dip switch to “WELL”
(30°F) [-1.1°C], the factory default setting. (Refer to the Dip Switch
Field Selection table).
Freeze Detection
Aurora Base Control Box
LX ULTRA SERIES INSTALLATION MANUAL