Condensate Drain Connections — There are a to- tal of five drain connections required on each unit: one primary drain (on right-hand side of the unit) and four secondary drains (two on each side of unit).
PRIMARY DRAIN — The primary drain is a 2-in. NPT pipe connection located on the right-hand side of the unit looking at the unit from the return air end. See Fig. 15-24.
With field-supplied fittings and pipe sections, plumb the pri- mary condensate drain to the 2-in. FPT connector on the base rail. Use a trap height of at least 4-in. for size 030-070 units and 7-in. for size 075-105 units. See Fig. 24 and 25. Install with a height dimension of at least 2-in. from the top of the exit pipe from the trap section to the bottom of the connector. Apply a bead of RTV or similar sealant around the pipe joint at the con- nector in the base rail.
SECONDARY DRAINS (Units Installed on Curb) — There are two secondary drain connections on each side of the unit. See Fig. 26. There are secondary drains on each side of the unit in the filter section and one on each side of the unit in the supply fan section. There are labels marking each location on the unit base rail. See Fig. 15-23.
Locate the four 11/4-in. drain coupling assemblies and mounting screws (shipped in a bag taped to the basepan in the supply fan section, located behind the access panel marked FAN SECTION). The drain couplings are a 10-gage plate with a 11/4 in. half coupling welded to the plate.
At each secondary drain hole location, there is a 13/8-in. hole pre-drilled in the bottom of the base rail, surrounded by four 0.20-in. engagement holes. Install a drain coupling assem- bly using screws provided at each secondary drain hole loca- tion. See Fig. 27. Do not attach any drain coupling assemblies in the condenser section base rail.
Using field-supplied fittings and pipe sections, assemble U- traps at each secondary drain fitting. See Fig. 28. Provide a minimum size of ½-in. pipe for secondary drains. Use a trap at least 4-in. deep for size 030-070 units and 7-in. deep for size 075-105 units. Apply a bead of RTV or similar sealant around the drain assemblies.
Consult local plumbing codes for direction on joining multi- ple drain lines. Total size of any combined line does not need to exceed nominal 2-in. size of primary drain connection.
Fill the U-traps at the secondary drain locations prior to unit start-up. Also check the U-traps before each cooling season to ensure the traps are filled and functioning properly.
SECONDARY DRAINS (Units Installed on Steel Beam or Slab) — There are two secondary drain connections required on each side of the unit. See Fig. 26. There are secondary drains on each side of the unit in the filter section and one on each side of the unit in the supply fan section. There are labels marking each location on the unit base rail. See Fig. 15-23. Pri- or to final positioning of the unit, apply a bead of RTV or simi- lar sealant around each secondary drain hole in the bottom of the unit base rail. Then position the unit into final location.
Locate the four 11/4-in. drain coupling assemblies and mounting screws (shipped in a bag taped to the basepan in the supply fan section, located behind the access panel marked FAN SECTION). The drain couplings are a 10-gage plate with a 11/4 in. half coupling welded to the plate.
After final positioning of the unit, perform the following procedure:
1.At each of the four secondary drain locations (marked with labels on the unit base rail), position the drain cou- pling assembly in the side of the base rail. Mark the screw holes and the drain hole locations on the base rail.
2.Drill holes for drain outlet (use 13/8-in. hole saw) and for the mounting screws (use 3/16-in. drill bit).
3.Install a drain coupling assembly using screws provided at each secondary drain hole location.
4.Using field-supplied fittings and pipe sections, assemble U-traps at each secondary drain fitting. See Fig. 28. Pro- vide minimum size of ½-in. pipe for secondary drains. Use a trap at least 4-in. deep for size 030-070 units and 7-in. deep for size 075-105 units.
5.Apply a bead of RTV or similar sealant around the drain assemblies.
Consult local plumbing codes for direction on joining multi- ple drain lines. Total size of any combined line does not need to exceed nominal 2-in. size of primary drain connection.
Fill the U-traps at the secondary drain locations prior to unit start-up. Also check the U-traps before each cooling season to ensure the traps are filled and functioning properly.
