W415-3101 / B / 01.09.23
16
IOM
IOM
7.3 VENT DRAIN OPTION
H11.4B
A vent drain is recommended when vent passes through any unconditioned space such as an attic or crawl
space in order to prevent the accumulation of excess condensate in the inducer housing during operational
cycles, refer to images for Vent Drain Option.
To install the vent drain, complete the following steps:
IMPORTANT: Tee, reducer and nipple must be properly
cemented together using the appropriate method
and materials specifi ed in section 7.0 Venting and
Combustion Piping; 7.1 Acceptable Materials in Canada
and 7.2 Acceptable Materials in United States.
1. Place a tee of the proper diameter for the vent system
being installed 2" (51mm) or 3" (76mm) in the horizontal run
or vertical riser closest to the furnace.
2. Place a reducer bushing of proper diameter in the stem
portion of the tee. The recommended size for the reducer is
5/8" (15.9mm).
3. Place a piece of 5/8" (15.9mm) diameter pipe that has a
minimum length of 3" (76mm) long into the reducer to serve
as a nipple.
4. Connect a piece of fl exible drain tubing such as EPDM
rubber or PVC to the nipple.
5. Loop the drain tubing to provide a trap.
6. Connect the discharge end of the drain tube to the
condensate disposal system externally to the furnace.
IMPORTANT:
ELBOWS WITH DRAIN PORTS
ARE NOT RECOMMENDED, AS
CONDENSATE CAN BYPASS THE
DRAIN ON THE CURVE.
3" (76mm) MIN.
10" (254mm) MAX.
LOOP DIAMETER
ATTACH THIS END TO
CONDENSATE DRAIN
SYSTEM
1/2" (12.7mm) ID MAX.
USE SWEEP TEE ON
HORIZONTAL LINE
NOTE
• Any increase of venting diameter
must be done on the vertical
sections NOT horizontal sections.
This will prevent condensate from
fl owing back to the trap for proper
drainage.
To Next Page
Loading...
Need help?
General
