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Crown Boiler Company
CWD Series Boilers
50-003 (3”), 50-004 (4”)
Coaxial Terminal Installation Instructions
If the optional coaxial terminal is used, it should be installed in the wall before vent assembly is started. Install the terminal in
accordance with the following procedure (Figures 1a, 1b & 1c):
Position the wall face plate on the outside wall in the desired terminal location. Verify that this location will permit the 1.
terminal, and connected venting, to clear any obstructions on the inside of the wall with the appropriate clearances. Mark the
location of the round opening on the wall.
For 3” terminals, cut a 5 ¼” Diameter hole through the wall at this location. For 4” terminals, cut a 7 1/4” opening.2.
Attach the mounting plate to the outside wall with suitable fasteners. 3.
Attach the intake terminal to the straight coaxial section. To do this, clean the male and female ends of the inner pipes with 4.
an alcohol pad. Lubricate the gasket in the female end of the straight section with a package of the silicone lubricant provided
and then push the intake terminal fi rmly onto the straight section until the intake terminal makes contact with the bead on
the straight section. Secure the two fi ttings together with the self-drilling screws provided. Use a low torque setting to install
these screws so as not to strip out the holes.
Pass the assembled intake terminal and straight section through the wall from the outside. Bend the four Tabs in the wall face 5.
plate towards the outside when doing this. Do not attach the pipe to the plate yet.
Adjust the position of the terminal in the wall so that the edge of the intake skirt is 2-3” from the wall plate (Figure 1c). Also 6.
verify that the terminal is pitched in the same direction as the rest of the vent system.
Attach the intake/straight section to the wall face plate using the self drilling screws provided. 7.
Continued on Reverse Side
NOTE
• Coaxial portion of inside terminal section may be installed in direct contact with combustible construction.
• Maximum wall thickness through which this terminal can be installed is 13”
CAUTION
This terminal is for use on Crown CWD Series boilers only. Do not use this terminal on any other appliance.•
See the CWD Series Installation Manual for complete vent system installation instructions.•
FIGURE 1a: HORIZONTAL DIRECT VENTING USING COAXIAL TERMINAL