Installation instructions
3.6.3Condensate drain requirements
An external condensate drain must always be installed except when using one 90° elbow and less than 3 feet of horizontal pipe.
Note: condensate must be disposed of according to local codes.
1.Install condensate drain as close to heater as possible.
2.Use 3/8" ID high temperature silicone tube to connect to condensate drain port. Do not use copper piping for any portion of the condensate drain.
3.Form a condensate trap by means of a 3" loop partially filled with water to form a gas trap. Add small amount of mineral oil if the trap is drying out.
4.To increase the tube length, connect to end of the high temperature silicone tubing with vinyl tubing, PVC or CPVC pipe. Do not reduce the internal diameter at any point.
Fig. 17 Required condensate drain installation
3.6.4Room sealed installation (Twin pipe)
Although it is permitted to draw combustion air from inside, the recommended method is to provide combustion air through a 3" pipe from the outside. See Chapter 3.5 for more direction on combustion air.
To reduce pressure differentials between the exhaust and combustion air intake, it is required that both terminators exit on the same wall or roof. See Fig. 18 for an example horizontal twin pipe termination and Fig. 19 for the vertical twin pipe termination example. Use only approved rain caps. For vertical air inlets use 2 90° elbows with opening facing down and covered with a screen.
6 ft
2 ft
Fig. 18 Horizontal twin pipe termination
Fig. 19 Vertical twin pipe termination
18 | 6 720 607 909 |
