UDX Venting Instructions

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Table Of Contents

VENTING INSTRUCTIONS FOR UNIT HEATERS (MODEL UBX: STANDARD POWER VENT BLOWER TYPE AND MODEL UDX: STANDARD POWER VENT FAN TYPE)

Revision: CP-UBX-UDX-VENT (03-21) 1034631-0

VENTING INSTRUCTIONS FOR UNIT HEATERS

Supersedes: — (Original Version)

MODEL UBX: STANDARD POWER VENT BLOWER TYPE

MODEL UDX: STANDARD POWER VENT FAN TYPE

GENERAL INFORMATION

This manual applies only to venting instructions and must be used with the installation manual. Both manuals are

shipped with the heater. If either manual is missing, contact your distributor before beginning installation.

Important Safety Information

Please read all information in this manual thoroughly and become familiar with the capabilities and use of your

appliance before attempting to operate or maintain this unit. Pay attention to all dangers, warnings, cautions, and

notes highlighted in this manual. Safety markings should not be ignored and are used frequently throughout to

designate a degree or level of seriousness.

DANGER: A danger statement describes a potentially hazardous situation that if not avoided, will result in severe

personal injury or death and/or property damage.

WARNING: A warning statement describes a potentially hazardous situation that if not avoided, can result in severe

personal injury and/or property damage.

CAUTION: A caution statement describes a potentially hazardous situation that if not avoided, can result in minor

or moderate personal injury and/or property damage.

NOTE: A note provides important information that should not be ignored.

⚠ CAUTION ⚠

These units should not be used in an application where the heated space temperature is below

50°F (10°C). Operating under low ambient conditions may cause condensate to form in the heat

exchanger.

⚠ DANGER ⚠

• Each heater requires its own individual vent pipe run and vent cap. Manifolding of vent runs can

cause recirculation of combustion products into the building. Failure to comply could result in

severe personal injury, death, and/or property damage.

• Heaters certiﬁed for residential use are intended for the heating of non-living spaces that are

attached to or part of a structure that contains space for family living quarters. They are not

intended to be the primary source of heat in residential applications or to be used in sleeping

quarters.

• Installation should be performed by a qualiﬁed agency in accordance with these instructions.

The qualiﬁed service agency installing this unit is responsible for the installation.

Venting Requirements

• These unit heaters are certiﬁed as Category III heaters and are designed to operate safely and efﬁciently with

either a horizontal or vertical vent. Comply with the speciﬁc requirements and instructions.

• These unit heaters are certiﬁed for commercial/industrial installation. Model UDX heaters in unit sizes 030, 045,

060, 075, 100, and 125 are also certiﬁed for residential installation. Requirements and instructions vary depending

on whether the installation is residential or commercial/industrial. Select and follow the venting instructions that

apply to the installation only.

Summary of content (12 pages)

PAGE 1
Revision: CP-UBX-UDX-VENT (03-21) 1034631-0 Supersedes: — (Original Version) VENTING INSTRUCTIONS FOR UNIT HEATERS MODEL UBX: STANDARD POWER VENT BLOWER TYPE MODEL UDX: STANDARD POWER VENT FAN TYPE GENERAL INFORMATION This manual applies only to venting instructions and must be used with the installation manual. Both manuals are shipped with the heater. If either manual is missing, contact your distributor before beginning installation.
PAGE 2
GENERAL INFORMATION—CONTINUED Venting Requirements—Continued • Venting must be in accordance with local codes and with the National Fuel Gas Code Z223.1 or CAN/CSA B149.1 and B149.2, Installation Code for Gas Burning Appliances and Equipment. Local requirements supersede national requirements. ⚠ CAUTION ⚠ • When an existing appliance is removed or replaced in a venting system, verify that the venting system is properly sized to vent the new appliance.
PAGE 3
Condensation Mitigation • On units with long vent runs—over 50% of maximum vent length allowed—or installed in low ambient conditions (below 50°F), it is recommended that vent pipes be fitted at the low point of the vent system with a tee, a drip leg, and a cleanout cap to prevent any moisture in the vent pipe from entering the unit. The drip leg should be inspected and cleaned out periodically during the heating season.
PAGE 4
GENERAL INFORMATION—CONTINUED Vent Terminal (Type of Pipe and Vent Cap) Requirements—Continued Table 2. Minimum Clearance Requirements for Horizontal Vent Terminal Component/Structure Forced air inlet within 10 feet (3.
PAGE 5
INSTALLATION Installation instructions vary depending on the installation type: commercial/industrial or residential. For commercial/ industrial installations, refer to the Instructions for Commercial/Industrial Installations (Model UBX or UDX, All Unit Sizes) section. For residential installations, refer to the Instructions for Residential Installations (Model UDX, Unit Sizes 030, 045, 060, 075, 100, 125) section.
PAGE 6
INSTALLATION—CONTINUED Instructions for Commercial/Industrial Installations (Model UBX or UDX, All Unit Sizes)—Continued 7. Terminate vent as follows: a. Install double-wall type B terminal vent pipe (connect in accordance with APPENDIX A) and terminate vent with option CC1 or CC21 vent cap or Novavent #2NVTB4 vent cap. b. Refer to instructions shown in Figure 2 to install horizontal vent terminal. Figure 2. Horizontal Vent Terminal (Commercial/Industrial Installations) c.
PAGE 7
Heaters w/Option CC1, CC21 or Novavent #2NVTB4 vent cap. Figure 3. Vertical Vent Terminal (Commercial/Industrial Installations) Instructions for Residential Installations (Model UDX, Unit Sizes 030, 045, 060, 075, 100, 125) A Category III vent as defined by the National Fuel Gas Code Z223.1 or CAN/CSA B149.1 and B149.2 is required for a residential installation of model UDX units. Some venting requirements will vary, however, depending on whether the vent is horizontal or vertical.
PAGE 8
INSTALLATION—CONTINUED Instructions for Residential Installations (Model UDX, Unit Sizes 030, 045, 060, 075, 100, 125)—Continued Figure 4. Horizontal Vent Terminal (Residential Installations) c. Refer to instructions shown in Figure 5 to install vertical vent terminal. d. Ensure that vent terminal is installed in accordance with Vent Terminal (Type of Pipe and Vent Cap) Requirements section. Figure 5.
PAGE 9
Instructions for Commercial/Industrial or Residential Installations (Model UDX, Unit Sizes 030, 045, 060, 075, Vertical Category I) On vent systems where at least 75% of the equivalent length of the vent run is vertical and the vent terminates at least 5 feet above the vent outlet of the heater.
PAGE 10
APPENDIX A: INSTRUCTIONS FOR ATTACHING DOUBLE-WALL TYPE B VENT PIPE TO SINGLE-WALL PIPE NOTE: Work quickly to assemble components before sealant dries. STEP 1: Place continual 1/4inch bead of silicone sealant around circumference of single-wall pipe. STEP 2: Before sealant can dry, insert single-wall pipe into inner pipe of double-wall pipe until bead of sealant contacts inner pipe to create sealed joint. STEP 3: Drill three small holes spaced equally around doublewall pipe below sealant ring.
PAGE 11
APPENDIX B: INSTRUCTIONS FOR INSTALLING FLEX-L BRAND CATEGORY III VENT PIPE NOTES: • SUPPLIER NOTE: The adapters for Flex-L vent pipe, which are not available from the heater manufacturer, are available from a Flex-L brand vent pipe distributor. • These instructions are designed to assist the contractor who has selected to use Flex-L brand category III vent pipe to install a power-vented heater with a 4-inch (102-mm) venter outlet. • Work quickly to assemble components before sealant dries.
PAGE 12
APPENDIX B: INSTRUCTIONS FOR INSTALLING FLEX-L BRAND CATEGORY III VENT PIPE—CONTINUED Vent cap Sheet metal screw Silicone bead DETAIL A DETAIL B DETAIL C Figure B1. Reducer and Vent Cap 2. Run vent pipe: a. Determine vent length in accordance with residential or commercial/industrial vent length requirements in Installation section. b.