Carrier P5030-100, P3, 48P2, P4 installation instructions

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Fig. 8 — Gasket Location on Roof Curb (48P075-100 Units with Optional High-Capacity Power Exhaust)

Step 8 — Connect Condensate Drain — There are a total of five drain connections required on each unit: one primary drain (on right-hand side of the unit) and four second- ary drains (two on each side of unit).

PRIMARY DRAIN — The primary drain is a 2-in. FPT pipe connection located on the right-hand side of the unit looking at the unit from the return air end. See Fig. 12-21. Fig. 22 shows the additional length of units with an extended chassis.

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 075-100 units. See Fig. 23 and 24. 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. 25. There are secondary drains on each side of the unit in the filter section and on each side of the unit in the supply fan section. There are labels marking each lo- cation on the unit base rail. See Fig. 12-21.

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. 26. 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. 27. 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 075-100 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. There are secondary drains on the bot- tom of the base rail on each side of the unit in the filter section and on each side of the unit in the supply fan section. There are labels marking each location on the unit base rail. See Fig. 12-

21.Drain holes will need to be drilled in these locations at the side of the base rail. The existing secondary drain holes in the bottom of the base rail must be sealed. Prior to final positioning of the unit, apply a bead of RTV or similar sealant around each secondary drain hole in the bottom of the unit base rail. See Fig. 27. Install the metal seal plates then position the unit into final location.

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