WaterFurnace Envision2 - Manual (Page 17)

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ENVISION 2 COMPACT - 50 HZ INSTALLATION MANUAL
220 Volt Operation
All 220-240 units are factory wired for 240 volt operation.
For 220 volt operation, the red and blue transformer wires
must be switched on terminal strip PS.
CAUTION: When installing a unit with a
variable speed ECM blower motor in 420/50/3
voltage, a neutral wire is required to allow
proper unit operation.
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.
Power Connection
Connect the incoming line voltage wires to L1 and L2 of the
contactor for single-phase unit. Consult the Electrical Data
tables for correct fuse sizes.
Electrical Connections
For Aurora Base Control, set SW2-1, FP1, on the printed
circuit board for applications using a closed loop antifreeze
solution to -9.4°C. On applications using an open loop/
ground water system (or closed loop no antifreeze), set this
dip switch to -1.1°C, the factory default setting. (Refer to the
Dip Switch Field Selection table).
Freeze Detection
For FX10 board, the “red” wire must be removed from PB2-3
to change from -1.1°C, the factory default setting, to -9.4°C.
FX10 Control Box Aurora Base Control Box