Condensate Drain Piping - Trane 2/4TEC3F18B1000A Installer's Manual

2. Field supplied tubing should be cut square, round
and free of burrs at the connecting end. Clean the
tubing to prevent contaminants from entering the
system.
3. Run refrigerant tubing into the stub sockets of in-
door unit coil.
4. Braze and evacuate according to indoor and outdoor
installation instructions.
5. Seal around refrigerant lines.
PAINTED AREAS OF UNIT MUST BE SHIELDED
DURING BRAZING.
BRAZE SHIELD
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G. CONDENSATE DRAIN PIPING
NOTE: Make certain that the unit has been installed in a
level position to ensure proper draining.
The indoor blower is downstream of the evaporator coil
which creates a negative pressure at the condensate
drain connections during operation. The condensate
drain connections in front of the indoor coil are 3/4"
NPT. The lower connection is the primary drain. See
Figure 14.
Two secondary drain connections are provided for the
different orientations (See Figure 14). The lower of the
two should be connected as a backup to prevent conden-
sate overflow by a blocked primary drain. The weep
hole in center of drain coupling area should be sealed
with caulk or RTV except in downflow unless secondary
drain is connected.
For proper drainage of condensate, the following steps
should be followed:
18-GE08D1-7
Installer's Guide
1. The primary drain line must be trapped with a mini-
mum of 2" water seal as shown in Figures 15 & 16.
Do not use preformed 3/4" PVC running traps.
The use of Field fabricated or manufactured traps
as shown in Figures 15 & 16 is acceptable. The
manufactured trap shown in Figure 8 allows for a
float switch option to be added. Refer to the
manufacturer's data and instructions for details.
2. The trap must be located within 4 feet of the air
handler drain outlet connection.
3. It is recommended that a clean-out tee or cross
be installed in the primary drain line for future
maintenance (See Figures 15 & 16)
4. Do not use reducing fittings in the condensate
drain lines.
r
Seal weep
hole except
for Downflow
configuration
5. Slope the drain lines downward a minimum of 1/4"
per foot.
6. Insulate the primary drain to prevent sweating
where dew point temperatures may be met.
7. Provide means for drainage to prevent winter
freeze-up of condensate line.
8. Do not connect the drain line to a closed drain sys-
tem.
9. Use Teflon ® tape on the air handler drain line
connections! Do Not Use pipe joint compound or
PVC/CPVC cement!
It is always recommended that an auxiliary drain pan
be installed under a horizontally installed air handler.
Connect the auxiliary drain line to a separate drain line
(no trap is needed in this line) and terminate according
to local codes.
NOTE: DO NOT use a torch or flame near the plastic
drain pan coupling.
NOTE: DO NOT tighten the drain pipe excessively. Sup-
port the condensate piping and traps outside the unit
to prevent strain on the drain coupling.
3/4" NPT
Secondary
drain
connection
3/4" NPT
Primary drain
connection
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