REZNOR RZUDX300 Low Static Axial Fan Owner’s Manual

REZNOR RZUDX300 Low Static Axial Fan

Product Information

Technical Specifications

Model UDX

Unit Sizes

• 030
• 045
• 060
• 075
• 100
• 125
• 150
• 175
• 200
• 225
• 250
• 300
• 350
• 400

Features

• Installed without downturn nozzle or stepdown transformer
• Natural gas or propane options are available
• Aluminized-steel heat exchanger or SST heat exchanger options are available (409 SST or 316 SST)
• Single-stage or two-stage combination gas valve options are available
• 115/1/60 voltage
• Open drip-proof motor or enclosed motor options are available

Factory-Installed Options

• Option AA1: Natural gas
• Option AA2: Propane
• Option AC1: Aluminized-steel heat exchanger
• Option AC2: 409 SST heat exchanger
• Option AC4: 316 SST heat exchanger
• Option AG1: Single-stage combination gas valve
• Option AG2: Two-stage combination gas valve
• Option AK1: 115/1/60 voltage
• Option AL1: Open drip-proof motor
• Option AL14: Totally-enclosed motor

Field-Installed Options

• Option CC1: Multiple fan control (includes components for one control unit)
• Option CC21: Multiple fan control (includes components for each additional non-control unit)
• Option CD1: Locking cover for CL1 thermostat
• Option CD2: Locking cover for CL22 thermostat
• Option CD3: Bracket assembly for mounting thermostat on the unit
• Option CD4: High-elevation conversion
• Option CE1: Propane conversion
• Option CG1: Multiple fan control
• Option CG2: Multiple fan control
• Option CG4: Multiple fan control
• Option CK8: Multiple fan control
• Option CK10: Multiple fan control
• Option CK22: Multiple fan control
• Option CL1: Locking cover for CL1 thermostat
• Option CL22: Locking cover for CL22 thermostat
• Option CL31: Multiple fan control (includes components for one control unit and one additional unit)
• Option CL32: Multiple fan control (includes components for each additional non-control unit)
• Option CM1: Bracket assembly for mounting thermostat on the unit
• Option CM1B: High-elevation conversion
• Option CM3: Propane conversion
• Option DJ20: Multiple fan control
• Option DL2: Multiple fan control

Technical Data

Frequently Asked Questions (FAQ)

• Q: What are the available unit sizes for Model UDX?
  A: The available unit sizes for Model UDX are 030, 045, 060, 075, 100, 125, 150, 175, 200, 225, 250, 300, 350, and 400.

• Q: What are the available features of Model UDX?
  A: Model UDX can be installed without a downturn nozzle or stepdown transformer. It has options for natural gas or propane. The heat exchanger can be aluminised steel (409 SST) or SST (316 SST). It also has options for a single-stage or two-stage combination gas valve. The voltage is 115/1/60, and you can choose between an open drip-proof motor or a totally enclosed motor.

• Q: What are the available factory-installed options for Model UDX?
  A: The available factory-installed options for Model UDX are:

  • Option AA1: Natural gas
  • Option AA2: Propane
  • Option AC1: Aluminized-steel heat exchanger
  • Option AC2: 409 SST heat exchanger
  • Option AC4: 316 SST heat exchanger
  • Option AG1: Single-stage combination gas valve
  • Option AG2

Unit Sizes
These heaters are available in fourteen unit sizes based on 30,000–400,000 BTUh input.

Features

• 115/1/60 supply
• Integrated circuit board with seven-segment display
• Easily-viewed status-indicating LED
• Hinged access door panel with quarter-turn latch
• Improved cabinet design with removable front face
• Two-toned white and black powder paint
• Patented single-burner combustion system
• Natural gas or propane
• 50–60°F temperature rise
• TCORE2® titanium-stabilized aluminized-steel heat exchanger
• External terminal strip for 24V wiring
• Built in disconnect switch
• Four-point suspension standard on all unit sizes (two-point suspension available on unit sizes 030–125 when installed without downturn nozzle or step-down transformer)

Factory-Installed Options

Field-Installed Options

vertical louvres
CE1| Manual shutoff valve, natural gas or propane
CG1| 208V–115V stepdown transformer
CG2| 230V–115V stepdown transformer
CG4| 460V–115V stepdown transformer
CK8| Adapts 3/8-inch hangers for two-point suspension from 1-inch threaded pipe
CK10| Adapts 3/8-inch hangers for four-point suspension from 1-inch threaded pipe
CK22| Angle brackets for low ceiling mounting (does not include hanger rods)
CL1| Single-stage thermostat
CL22| Two-stage thermostat
CL31, CL32| Multiple fan control: option CL31 includes components for one control unit and one additional unit— option CL32 includes components for each additional non-control unit
---|---
CM1| Locking cover for CL1 thermostat
CM1B| Locking cover for CL22 thermostat
CM3| Bracket assembly for mounting thermostat on unit
DJ20| High-elevation conversion
DL2| Propane conversion

Technical Data

99,600
kW| 7 .2| 10 .9| 14 .6| 18 .2| 25 .5| 29 .2
Gas connection, natural gas **| ****

inch

| 1/2
Gas connection, propane **
Vent connection diameter ***| 4
Control, 24V| ****

amp

| 1 .0
Full load amps, 115V| 1 .9| 2 .4| 2 .4| 3 .7| 4 .3| 5 .6
Maximum overcurrent protection, 115V †| 15
Normal power consumption| watt| 109| 155| 155| 217| 276| 354
Discharge air temperature rise| °F| 50| 55| 60| 60
Air volume| CFM| 456| 629| 769| 961| 1345| 1537
meter 3 /minute| 12 .9| 17 .8| 21 .8| 27 .5| 36 .7| 45 .9

Discharge air opening area

| feet 2| 0 .96| 1 .25| 2 .01
meter 2| 0 .09| 0 .12| 0 .19
Output velocity| FPM| 475| 656| 616| 770| 668| 763
meter/minute| 145| 200| 188| 235| 204| 233
Open fan motor size| HP| 0 .02| 0 .03| 0 .03| 0 .06| 1/30| 1/20
Totally-enclosed fan motor size| 0 .06| 0 .06| 1/4
Fan motor speed| RPM| 1550| 1550| 1050
Fan diameter| inch| 10| 12| 16
Sound level @ 15 feet| dBa| 40| 40| 49| 54| 55
* ETL ratings for elevations up to 2,000 feet.
**The size  shown is for gas connection to a single-stage gas valve—not supply line size.
*** Smaller and/or larger vent and combustion air pipe diameters may be permissible (refer to appropriate venting instructions).
† MOCP = 2 .25 × (largest motor FLA) + smallest motor FLA . The answer is rounded to the next lower standard circuit breaker size.
Parameter| Unit of Measure| Unit Size
---|---|---
150| 175| 200| 225| 250| 300| 350| 400
Input heating capacity| BTUh| 150,000| 175,000| 200,000| 225,000| 250,000| 300,000| 350,000| 400,000
kW| 44 .0| 51 .3| 58 .6| 65 .9| 73 .3| 87 .9| 102 .6| 117 .2
Thermal efficiency| %| 83
Output heating capacity *| BTUh| 124,500| 145,250| 166,000| 186,750| 207,500| 249,000| 290,500| 332,000
kW| 36 .5| 42 .6| 48 .7| 54 .7| 60 .8| 73 .0| 85 .1| 97 .3
Gas connection, natural gas **| ****

inch

| 1/2| 3/4| 3/4
Gas connection, propane **
Vent connection diameter **| 5| 5| 6
ETL ratings for elevations up to 2,000 feet .
** Size shown is for gas connection to a single-stage gas valve—not supply line size .
*** Smaller and/or larger vent and combustion air pipe diameters may be permissible (refer to appropriate venting instructions) .
Parameter| Unit of Measure| Unit Size
---|---|---
150| 175| 200| 225| 250| 300| 350| 400
Control, 24V| ****

amp

| 1 .0
Full load amps, 115V| 3 .8| 4 .6| 7 .5| 7 .5| 11 .0
Maximum overcurrent protection, 115V †| 15| 15| 20
Normal power consumption| watt| 392| 491| 747| 747| 1086
Discharge air temperature rise| °F| 60
Air volume| CFM| 1921| 2242| 2562| 2882| 3202| 3843| 4483| 5123
meter 3 /minute| 54 .4| 63 .5| 72 .5| 81 .6| 90 .7| 108 .8| 126 .9| 145 .1

Discharge air opening area

| feet 2| 2 .56| 3 .51| 3 .51| 4 .79
meter 2| 0 .24| 0 .33| 0 .33| 0 .45
Output velocity| FPM| 752| 877| 1003| 820| 911| 802| 936| 1069
meter/minute| 229| 267| 306| 250| 278| 244| 285| 326
Open fan motor size| HP| 1/6| 1/4| 1/4| 1/2
Totally-enclosed fan motor size| 1/4
Fan motor speed| RPM| 1050
Fan diameter| inch| 18| 20| 20| 24
Sound level @ 15 feet| dBa| 51| 52| 53| 56| 56| 59| 61| 62
† MOCP = 2 .25 × (largest motor FLA) + smallest motor FLA . Answer is rounded to the next lower standard circuit breaker size .

Certification

These unit heaters are listed by Intertek for use in industrial and commercial installations in the United States and Canada. In addition, unit sizes 030, 045, 060, 075, 100, and 125 are listed in the United States and Canada as utility heaters for use in non-living spaces that are attached to, adjacent to, or part of a structure that contains space for family living quarters.

Heater Throw Distances with Standard Horizontal Louvers

The graphic shows throw patterns and the table lists throw distances for heaters suspended at varying mounting heights. The louvre angles listed are relative to the top of the heater.

• H = Distance from the bottom of the heater to the floor
• X = Distance from the heater to start of the floor coverage
• Y = Distance to end of floor coverage
• Z = Distance at which air velocity drops below 50 feet (15.2 meters) per minute

H *** (Feet**

(Meters))

| ****

Distance *** or Angle**

| Unit Size
---|---|---
030| 045| 060| 075| 100| 125| 150
Feet (Meters)

5 (1 .5)

| X| 6 (1 .8)| 7 (2 .1)| 8 (2 .4)| 9 (2 .7)| 9 (2 .7)| 10 (3 .0)| ****

—

Y| 14 (4 .3)| 16 (4 .9)| 18 (5 .5)| 20 (6 .1)| 20 (6 .1)| 22 (6 .7)
Z| 30 (9 .1)| 40 (12 .2)| 45 (13 .8)| 57 (17 .4)| 59 (18 .0)| 65 (19 .9)
Downward louver angle| 21°| 20°| 16°| 14°| 18°| 14°

8 (2 .4)

| X| 7 (2 .1)| 9 (2 .7)| 10 (3 .0)| 12 (3 .7)| 11 (3 .4)| 12 (3 .7)| 13 (4 .0)
Y| 13 (4 .0)| 16 (4 .9)| 18 (5 .5)| 22 (6 .7)| 21 (6 .4)| 23 (7 .0)| 24 (7 .3)
Z| 26 (7 .9)| 37 (11 .3)| 42 (12 .8)| 54 (16 .5)| 56 (17 .1)| 63 (19 .2)| 73 (22 .3)
Downward louver angle| 39°| 34°| 29°| 25°| 28°| 24°| 26°

10 (3 .0)

| X| 6 (1 .8)| 9 (2 .7)| 10 (3 .0)| 12 (3 .7)| 12 (3 .7)| 13 (4 .0)| 14 (4 .3)
Y| 11 (3 .4)| 15 (4 .6)| 17 (5 .2)| 22 (6 .7)| 20 (6 .1)| 24 (7 .3)| 24 (7 .3)
Z| 22 (6 .7)| 33 (10 .0)| 39 (11 .9)| 52 (15 .8)| 52 (15 .8)| 60 (18 .3)| 69 (21 .0)
Downward louver angle| 52°| 43°| 37°| 32°| 36°| 30°| 32°

12 (3 .7)

| X| ****

—

| 8 (2 .4)| 10 (3 .0)| 12 (3 .7)| 11 (3 .4)| 14 (4 .3)| 14 (4 .3)
Y| 12 (3 .7)| 16 (4 .9)| 21 (6 .4)| 19 (5 .8)| 23 (7 .0)| 24 (7 .3)
Z| 27 (8 .2)| 34 (10 .4)| 48 (14 .6)| 47 (14 .3)| 57 (17 .4)| 64 (19 .5)
Downward louver angle| 55°| 46°| 39°| 44°| 36°| 39°

14 (4 .3)

| X| ****

—

| 9 (2 .7)| 12 (3 .7)| 11 (3 .4)| 14 (4 .3)| 14 (4 .3)
Y| 14 (4 .3)| 19 (5 .8)| 17 (5 .2)| 22 (6 .7)| 22 (6 .7)
Z| 29 (8 .8)| 44 (13 .4)| 42 (12 .8)| 53 (16 .1)| 59 (18 .0)
Downward louver angle| 56°| 46°| 51°| 43°| 45°

16 (4 .9)

| X| ****

—

| 11 (3 .4)| 10 (3 .0)| 13 (4 .0)| 13 (4 .0)
Y| 17 (5 .2)| 14 (4 .3)| 20 (6 .1)| 20 (6 .1)
Z| 38 (11 .6)| 34 (10 .4)| 47 (14 .3)| 53 (16 .2)
Downward louver angle| 54°| 58°| 50°| 51°

18 (5 .5)

| X| ****

—

| 11 (3 .4)| 11 (3 .4)
Y| 17 (5 .2)| 17 (5 .2)
Z| 40 (12 .2)| 44 (13 .4)
Downward louver angle| 57°| 58°
H *** (Feet**

(Meters))

| ****

Distance *** or Angle**

| Unit Size
175| 200| 225| 250| 300| 350| 400
Feet (Meters)

8 (2 .4)

| X| 15 (4 .6)| 16 (4 .9)| 14 (4 .3)| 16 (4 .9)| 15 (4 .6)| 17 (5 .2)| 18 (5 .5)
Y| 28 (8 .5)| 30 (9 .1)| 27 (8 .2)| 29 (8 .8)| 28 (8 .5)| 31 (9 .4)| 34 (11 .3)
Z| 90 (27 .4)| 93 (28 .0)| 86 (26 .2)| 93 28 .3| 94 (28 .7)| 105 (32 .0)| 113 (34 .4)
Downward louver angle| 22°| 20°| 24°| 21°| 24°| 20°| 17°

10 (3 .0)

| X| 17 (5 .2)| 17 (5 .2)| 15 (4 .6)| 17 (5 .2)| 16 (4 .9)| 18 (5 .5)| 20 (6 .1)
Y| 29 (8 .8)| 31 (9 .4)| 27 (8 .2)| 30 (9 .1)| 28 (8 .5)| 32 (9 .8)| 35 (10 .7)
Z| 87 (26 .6)| 91 (27 .7)| 82 (25 .0)| 90 27 .4| 89 (27 .1)| 103 (31 .4)| 110 (33 .5)
Downward louver angle| 27°| 25°| 30°| 26°| 29°| 25°| 21°

12 (3 .7)

| X| 18 (5 .5)| 18 (5 .5)| 16 (4 .9)| 18 (5 .5)| 17 (5 .2)| 19 (5 .8)| 21 (6 .4)
Y| 29 (8 .8)| 31 (9 .4)| 27 (8 .2)| 30 (9 .1)| 28 (8 .5)| 32 (9 .8)| 36 (11 .0)
Z| 84 (25 .6)| 88 (26 .8)| 78 (23 .8)| 87 26 .5| 85 (25 .9)| 98 (29 .9)| 108 (32 .9)
Downward louver angle| 32°| 30°| 35°| 31°| 34°| 30°| 25°

14 (4 .3)

| X| 18 (5 .5)| 19 (5 .8)| 16 (4 .9)| 18 (5 .5)| 17 (5 .2)| 20 (6 .1)| 23 (7 .0)
Y| 28 (8 .5)| 30 (9 .1)| 26 (7 .9)| 30 (9 .1)| 27 (8 .2)| 32 (9 .8)| 35 (10 .7)
Z| 79 (24 .1)| 84 (25 .6)| 73 (22 .3)| 83 25 .3| 80 (24 .4)| 95 (29 .0)| 105 (32 .0)
Downward louver angle| 37°| 34°| 41°| 36°| 40°| 34°| 29°

16 (4 .9)

| X| 18 (5 .5)| 19 (5 .8)| 16 (4 .9)| 19 (5 .8)| 17 (5 .2)| 21 (6 .4)| 23 (7 .0)
Y| 27 (8 .2)| 29 (8 .8)| 24 (7 .3)| 28 (8 .5)| 25 (7 .6)| 31 (9 .4)| 35 (10 .7)
Z| 74 (22 .6)| 79 (24 .1)| 67 (20 .4)| 78 23 .8| 74 (22 .6)| 90 (27 .4)| 101 (30 .8)
Downward louver angle| 42°| 39°| 47°| 41°| 45°| 38°| 33°

18 (5 .5)

| X| 17 (5 .2)| 19 (5 .8)| 14 (4 .3)| 18 (5 .5)| 16 (4 .9)| 20 (6 .1)| 23 (7 .0)
Y| 26 (7 .9)| 28 (8 .5)| 22 (6 .7)| 27 (8 .2)| 24 (7 .3)| 30 (9 .1)| 35 (10 .7)
Z| 68 (20 .7)| 74 (22 .6)| 60 (18 .3)| 72 (21 .9)| 66 (20 .1)| 85 (25 .9)| 97 (26 .9)
Downward louver angle| 48°| 44°| 53°| 46°| 51°| 43°| 37°
***** See graphic above.

Installation Codes

• These units must be installed in accordance with local building codes. In the absence of local codes, in the United States, the unit must be installed in accordance with the National Fuel Gas Code, ANSI Z223.1. A Canadian installation must be in accordance with the CSA B149 Natural Gas and Propane Installation Code. This code is available from CSA Information Services, 1-800-463-6727. Local authorities having jurisdiction should be consulted before installation is made to verify local codes and installation procedure requirements.
• Installations in aircraft hangars should be in accordance with ANSI/NFPA No. 409 (latest edition), Standard for Aircraft Hangars. Installations in public garages should be in accordance with ANSI/NFPA No. 88A (latest edition), Standard for Parking Structures. Installations in repair garages should be in accordance with ANSI/NFPA No. 88B (latest edition), Standard for Repair Garages. In Canada, installations in aircraft hangars should be in accordance with the requirements of the enforcing authorities, and in public garages, in accordance with the CSA B149 code.
• If the heater is being installed in the Commonwealth of Massachusetts, installation must be performed by a licensed plumber or licensed gas fitter.

Clearances

Units must be located so that clearances are provided with regards to combustion air space, inspection, and service and for proper spacing from combustible construction. Clearance to combustibles is defined as the minimum distance from the heater to a surface or object for which it is necessary to ensure that a surface temperature of 90°F (50°C) above the surrounding ambient temperature is not exceeded.

Heater Surface

| Unit Size
---|---
030–125| 150–400
Minimum Clearance (Inches (mm))
Top| 1 (25)| 4 (102)
Flue connector| 6 (152)| 6 (152)
Access panel| 18 (457)| 18 (457)
Non-access side| 1 (25)| 2 (51)
Bottom*| 1 (25)| 1 (25)
Rear| 18 (457)| 18 (457)
Front| Refer to values for variable X (distance from heater to start of floor coverage) in Heater Throw Distances with Standard Horizontal Louvers* section
Suspend the heater so that the bottom is a minimum of 5 feet (1.5 meters) above the floor.
**Measure rear clearance from the fan motor.

Weights

Type

| Unit Size
---|---
030| 045| 060| 075| 100| 125| 150| 175,

200

| 225| 250| 300| 350| 400
Pounds (kg)
Unit| 57

(26)

| 62

(28)

| 71

(32)

| 76

(34)

| 101

(46)

| 106

(48)

| 178

(81)

| 193

(88)

| 211

(96)

| 223

(101)

| 277

(126)

| 303

(137)

| 316

(143)

Shipping| 63

(29)

| 68

(31)

| 76

(34)

| 81

(37)

| 120

(54)

| 125

(57)

| 206

(93)

| 221

(100)

| 247

(112)

| 259

(117)

| 323

(147)

| 348

(158)

| 360

(163)

Dimensions

Inches (mm)
A| 13-3/4 (349)| 16-3/4 (425)| 24-3/4 (629)| 20-1/8 (511)| 26-1/8 (664)| 34-1/8 (867)
B| 27 (686)| 38-3/16 (970)| 41 (1041)
C| 10 (254)| 13 (330)| 21 (533)| 16 (406)| 22 (559)| 30 (762)
D| 13-13/16 (351)| 23 (584)
E| 29-3/4 (756)| 32-23/32 (831)| 31-29/32 (810)| 34-9/32 (871)| 34-9/32 (871)| 48-7/16 (1230)| 48-29/32 (1243)
F| 25-9/16 (649)| 40 (1016)
G| 6 (152)| 8-11/16 (221)| 15-5/16 (389)| 9-5/8 (244)| 13-1/16 (332)| 17-1/16 (433)
H| 5-15/16 (151)| 8-5/16 (211)| 8-1/2 (216)
J| 3-1/2 (89)| 6 (152)| 8-29/32 (226)| 5-3/8 (137)| 9 (229)| 11-13/16 (300)
K| 3-11/32 (85)| 6-1/2 (165)| 7-5/16 (186)
M | 17-3/8 (441)| 25-11/16 (652)| 27-11/16 (703)
N | 1-9/16 (40)| 1-13/32 (36)
P | 4-9/32 (109)| 8-1/8 (206)
Q | 13 (330)| 22-3/16 (564)
R **| 11-9/16 (294)| 16-3/8 (416)| 15-5/8 (397)| 16-1/4 (413)
S| 3-3/4 (95)| 4-1/16 (103)| 5-15/32 (139)| 5-1/2 (140)| 8-1/16 (205)| 11-9/16 (294)
T| 2-15/16 (75)| 4-1/4 (108)| 4-5/16 (110)| 4-1/2 (114)
* Heater suspension points for four-point suspension (3/8-16 FEM) .
** Heater suspension points for two-point suspension (3/8-16 FEM) .

DANGER

FIRE OR EXPLOSION HAZARD

• Failure to follow safety warnings exactly could result in serious injury, death, or property damage.
• Improper installation, adjustment, alteration, service, or maintenance can cause serious injury, death, or property damage.
• Installation and service must be performed by a qualified installer, service agency, or gas supplier.
• Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Leave the building immediately.
• Immediately call your gas supplier from a phone remote from the building. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.

For more information on Reznor HVAC products:

• Contact your local Reznor representative at 1-800-695-1901
• Refer to the manuals and additional consumer materials found at www.reznorhvac.com.

Specifications and illustrations are subject to change without notice or incurring obligations. The latest version of this document is available at www.reznorhvac.com.
©2023 Nortek Global HVAC LLC, O’Fallon, MO. All rights reserved.

UDX-TSL (07-23) REV-A

Documents / Resources

| REZNOR RZUDX300 Low Static Axial Fan [pdf] Owner's Manual
RZUDX300 Low Static Axial Fan, RZUDX300, Low Static Axial Fan, Static Axial Fan, Axial Fan, Fan
---|---

References

• Reznor HVAC

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