REZNOR UBX Blower Type Gas Fired Unit Heaters User Manual
- June 17, 2024
- Reznor
Table of Contents
REZNOR UBX Blower Type Gas Fired Unit Heaters
Specifications
- Revision: OPT-CD11 (01-24) 1036422-A
- Supersedes: UBX-UBZ-CD11 (01-22) 1036422-0
- Product: Polytube Adapter Kit
- Compatible with Models: UBX, UBXC, and UBZ
Installation
-
If the heater is installed, turn OFF gas and electric power. Allow time for louvers to cool before proceeding.
-
Remove each horizontal louver by pushing the louver toward the spring to release it.
-
Position the polytube adapter side panels so that the louver holes align and secure the panels to the faceplate using screws from the kit.
-
Position the polytube adapter top panel so that the holes align with the side panels and mark holes across the top of the heater outlet. Remove the top panel and drill 1/8-inch holes in the faceplate. Reposition the panel, align the holes, and secure the
panel to the faceplate using screws from the kit. -
Position the polytube adapter bottom panel so that the holes align with the side panels and mark holes across the bottom of the
heater outlet. Remove the bottom panel and drill 1/8-inch holes in the faceplate. Reposition the panel, align the holes, and secure the panel to the faceplate using screws from the kit. -
Slide the discharge panel over the front of the polytube adapter assembly and secure it to the top, bottom, and side panels using screws from the kit.
-
Connect field-supplied polytube ductwork to the discharge panel and secure it using the discharge duct collar clamp.
-
Provide support for the polytube ductwork according to the polytube manufacturer’s instructions. It is generally recommended that the first suspension point be 10 feet (3 meters) from the heater, and additional suspension be provided at approximately 8-foot (2.4-meter) intervals.
POLYTUBE ADAPTER KIT INSTALLATION FOR BLOWER-TYPE GAS-FIRED UNIT HEATERS
OPTION CD11 FOR MODELS UBX, UBXC, AND UBZ
NOTES
- Before installing a polytube adapter assembly, ensure that the installation location provides sufficient clearance for the adapter and field-installed ductwork.
- Polytubes are normally supplied open at both ends. The end opposite the heater must be closed to permit the polytube to inflate.
- Polytube selection is the responsibility of the installer. Different grades, hole positions, hole sizes, and lengths are available. Some local code authorities require that polytube material be a nationally-recognized or certified material. Consult code authorities that have jurisdiction and the polytube supplier to determine the appropriate polytube material and recommend methods of suspension.
- The total open or free area of the polytube is important. Polytube suppliers have a great deal of flexibility in the placement and sizing of holes. Too small of a free area will cause overheating and damage to the polytube. Too large of an open area may not permit the tube to inflate.
- The polytube adapter kit (option CD11) adapts unit sizes 75–400 of blower-type unit heaters for use with polytube ductwork. The adapter is installed directly in line with the heater discharge on the front of the heater and is equipped with a collar for attaching the field-supplied polytube.
- The most common application of polytube ductwork for distribution of tempered air is in greenhouses. Polytubes are also used in industrial buildings to improve operating efficiency by recovering stratified air and reducing the need for complete area heating.
- Refer to the installation manual provided with the heater for important safety information.
- Ensure that all components listed in Table 1 are available before beginning installation.
Table 1. Kit Components
Component| Unit Size (MBTUh)
75| 100, 125| 150, 175, 200| 225, 250| 300, 350, 400
Kit PN
1036371| 1036372| 1036373| 1036374| 1036375
Component PN
Adapter top| 1036332| 1036333| 1036334| 1036335| 1036336
Adapter bottom
Adapter right side| 1036337| 1036338| 1036339| 1036340| 1036341
Adapter left side
Discharge panel assembly| 101249| 101250
Discharge duct collar clamp| 101499| 146463
Screw, sheet metal, #10 × 1/2 long| 11813 (52)
Screw, sheet metal, #10 × 3/4 long| 20859| —
Screw, hex head, 1/4-20 × 1-1/2 long| —| 51231
Nut, hex, 1/4-20| —| 7328
Nut, wing, 1/4-20| —| 107246
DO NOT DESTROY. PLEASE READ CAREFULLY. KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.
INSTALLATION
-
If heater is installed, turn OFF gas and electric power. Allow time for louvers to cool before proceeding.
-
Remove each horizontal louver by pushing louver toward spring to release louver.
-
Position polytube adapter side panels (see Figure 1) so that louver holes align and secure panels to face plate using screws from kit.
Figure 1. Typical Face Plate Assembly and Polytube Adapter Assembly -
Position polytube adapter top panel (see Figure 1) so that holes align with side panels and mark holes across top of heater outlet. Remove top panel and drill 1/8-inch holes in face plate. Reposition panel, align holes, and secure panel to face plate using screws from kit.
-
Position polytube adapter bottom panel (see Figure 1) so that holes align with side panels and mark holes across bottom of heater outlet. Remove bottom panel and drill 1/8-inch holes in face plate. Reposition panel, align holes, and secure panel to face plate using screws from kit.
-
Slide discharge panel (see Figure 1) over front of polytube adapter assembly and secure panel to top, bottom, and side panels using screws from kit.
-
Connect field-supplied polytube ductwork (refer to Table 2) to discharge panel and secure using discharge duct collar clamp.
-
Provide support for polytube ductwork in accordance with polytube manufacturer’s instructions. General recommendations are that first suspension point be 10 feet (3 meters) from heater and that additional suspension be provided at approximately 8-foot (2.4-meter) intervals.
-
Turn ON gas and electric power.
-
Light heater in accordance with lighting instructions.
-
Check for proper operation.
-
Check discharge air temperature in polytube ductwork 6–8 feet (1.8–2.4 meters) from heater using thermometer. Temperature rise range of 55–65°F is recommended.
-
Check motor load in accordance with installation manual provided with unit.
NOTE: For unit sizes 75 and 100 with a polytube adapter and ductwork, the required direct-drive blower speed is LOW. For unit size 125, the required speed is MEDIUM. -
Adjust blower speed in accordance with installation manual provided with unit to achieve desired range while maintaining motor current draw below full load amperes shown on motor rating plate.
Table 2. Field-Supplied Polytube Ductwork Specifications and Recommendations
Parameter| Unit of Measure| Unit Size (MBTUh)
75| 100| 125| 150| 175| 200| 225| 250|
300| 350| 400
Value
CFM at 60°F temperature rise| CFM| 960| 1345| 1540| 1920| 2240| 2560| 2880|
3200| 3840| 4480| 5120
Approximate free area| inch 2| 115| 160| 185| 230| 270| 300| 340| 380|
460| 540| 600
Diameter of holes with 50-foot polytube|
inch
| 1| 1-1/2| 2| 1-7/8| 2| 2-1/4| 2-1/2
Diameter of holes with 75-foot polytube| 1| 1-1/2| 2| 1-7/8| 2| 2-1/4| 2-1/2
Diameter of holes with 125-foot polytube| 1| 1-1/2| 2| 1-1/2| 2| 2-1/4| 2|
2-1/2| 2-1/4
Diameter of holes with 100-foot polytube| 1| 1-1/2| 2| 1-1/2| 2| 2-1/4| 2|
2-1/2| 2-1/4
Diameter of holes with 150-foot polytube| 1| 1-1/2| 1-7/8| 1-1/2| 2| 2-1/4| 2|
2-1/2| 2-1/4
Spacing of holes with 50-foot polytube| 8| 12-1/2| 12| 15| 12| 14| 12| 10| 12|
10
Spacing of holes with 50-foot polytube| 12| 18-3/4| 18| 22-1/2| 18| 21| 18|
15| 18| 15
Spacing of holes with 50-foot polytube| 16| 25| 24| 30| 15| 24| 28| 24| 16|
24| 16
Spacing of holes with 50-foot polytube| 20| 31-1/4| 30| 37-1/2| 18-3/4| 30|
35| 25| 20| 30| 20
Spacing of holes with 50-foot polytube| 24| 37-1/2| 36| 40| 22-1/2| 36| 42|
30| 24| 36| 24
Number of holes with 50-foot polytube|
quantity
| 75| 48| 50| 40| 50| 42| 50| 60| 50| 60
Number of holes with 75-foot polytube| 75| 48| 50| 40| 50| 42| 50| 60| 50| 60
Number of holes with 100-foot polytube| 75| 48| 50| 40| 80| 50| 42| 50| 75|
50| 75
Number of holes with 125-foot polytube| 75| 48| 50| 40| 80| 50| 42| 60| 75|
50| 75
Number of holes with 150-foot polytube| 75| 48| 50| 45| 80| 50| 42| 60| 75|
50| 75
Polytube diameter| inch| 18| 24
Specifications and illustrations subject to change without notice or incurring
obligations. Latest version of this manual is available at
www.reznorhvac.com.
©2024 Nortek Global HVAC LLC, O’Fallon, MO. All rights reserved.
OPT-CD11 (01-24) 1036422-
References
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