ENVISION RESIDENTIAL INSTALLATION MANUAL
Freeze Protection
Set the freeze sensing switch SW2-2 on the printed circuit board for applications using a closed loop antifreeze solution to “LOOP”. On applications using an open loop/ground water system (or closed loop no antifreeze), set this dip switch to “WELL”, the factory default setting. (Refer to the Dip Switch Field Selection table on page 24.)
Condensate Drain
On vertical units, the internal condensate drain assembly consists of a drain tube which is connected to the drain pan, a 3/4-inch PVC female adapter and a flexible connecting hose. The female adapter may exit either the front or the side of the cabinet. The adapter should be glued to the field-installed PVC condensate piping. On vertical upflow units, a condensate hose is inside all cabinets as a trapping loop; therefore, an external trap is not necessary.
On horizontal units, a PVC stub is provided for condensate drain piping connection. An external trap is required (see below). If a vent is necessary, an open stand pipe may be applied to a tee in the field-installed condensate piping.
Figure 5: Horizontal Drain Connection
3/4" PVC 
Coupling
Vent (if needed)
3/4" PVC 1/8" per foot
3/4” PVC tube stub | 1.5" | 1.5" |
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Figure 6: Unit Pitch for Drain
1/2'' Pitch
Drain