Condensate Drain System - Data Aire DAPA-2.5 Installation, Operation & Maintenance Manual

Condensate Drain System

Every indoor unit has a 3/4" (19 mm) copper stub provided for condensate removal. A union (field
provided) is recommended at the field connection which will permit easy disconnection from the unit for
cleaning.
A trap should be built into the drain line to prevent air from backing up into the unit. Drain lines should
be pitched downward not less than 1/4" (6.35 mm) for each ten (10) feet (3.1 m) of horizontal run. The
following are recommendation for condensate drain systems:
1. Do not reduce the size of the condensate drain line.
2. The condensate drain piping must be run to an unrestricted waste line and must be protected
from freezing.
3. In high humidity conditions it is recommended to insulate the condensate drain line to prevent
condensation forming on the exterior of the piping.
4. It is recommended that a union (field supplied) be installed at the 3/4" (19 mm) FPT connection
to permit easy disassembly of the condensate drain piping from the unit for cleaning.
5. Drain lines should be pitched downward not less than 1/4" (6.35 mm) for each ten (10) feet (3.1
M) of horizontal run.
6. Where local codes permit, PVC pipe may be used.
7. Ceiling units with an optional vertical discharge have a 5" (127 mm) plenum below the
evaporator drain pan. The plenum has knockouts that allow routing of the field supplied and
installed condensate drain piping system. The drain line can be routed out either side of these
units.
Some applications have no convenient means of allowing a gravity drain. When required, an optional
condensate pump can be used. Condensate pumps are either factory mounted or shipped loose.
Factory mounted condensate pumps do not require a separate power source.
Condensate pumps shipped loose (or field provided) typically require a dedicated 110-volt power
source. Field pipe connections must be made to the pump discharge connection. A check valve must
be installed to prevent short cycling. See condensate pump electrical requirements in
Pumps.
Do not expose drain line to freezing temperatures. Drain line may contain boiling water therefore use
copper or other suitable material. Drain line must comply with local building codes. It is recommended
to install water leak detection equipment whenever possible.
NOTE: Mini-Plus ceiling units with optional Energy Saver or Auxiliary Chilled
Water coils have a 28-1/2" (724 mm) frame height instead of the standard 24"
(610 mm) height.
26
3.11 Condensate