INSTALLATION—CONTINUED
Vent Connections for Standard Units—Continued
Category III Commercial/Industrial Installations—Continued
Category III vent pipe
Reznor (option CC1 or CC21)
or approved Category III vent cap
Figure 12. Vertical Vent Terminal (Commercial/Industrial Installations)
Category III Residential Installations (Model UDXC)
Residential installations of model UDXC unit sizes 30–100 may use a Category III dedicated vent as defined by the
National Fuel Gas Code (ANSI Z223.1) or the Installation Code for Gas Burning Appliances and Equipment (CSA
B149.1). Some venting requirements will vary depending on whether the vent is horizontal or vertical. Install the
vent as follows:
1. Select vent pipe (refer to Table 14) approved to UL standard 1738 for Category III appliance for either horizontal
or vertical vent run.
2. Determine vent pipe diameter and length. Minimum vent length is 3 feet (1 meter). Use only one diameter of vent
pipe for installation (refer to Table 13).
3. Make all vent pipe joint connections in accordance with Vent System Sealing section.
4. Properly support all vent pipe runs in accordance with Vent System Support Requirements section.
5. Take appropriate steps to mitigate condensation in accordance with Condensation Mitigation section.
6. Terminate vent as follows:
a. Install UL standard 1738 approved Category III vent pipe and terminate vent with option CC1 or CC21 vent
cap or approved Category III vent cap.
b. Refer to instructions shown in Figure 13 and to Table 11 to install horizontal vent terminal.
c. Refer to instructions shown in Figure 14 to install vertical vent terminal.
d. Ensure that vent terminal is installed in accordance with Vent Terminal Requirements section.
30
UBXC-UDXC-IOM (01-24) 1042980-0
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