Table of Contents
Advertisement
UNIT HEATER INSTALLATION/OPERATION/MAINTENANCE
MODEL UBX: STANDARD POWER VENT BLOWER TYPE
MODEL UBZ: SEPARATED-COMBUSTION BLOWER TYPE
MODEL UDX: STANDARD POWER VENT FAN TYPE
MODEL UDZ: SEPARATED-COMBUSTION FAN TYPE
• 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 the gas
supplier.
• Be sure to read and understand the installation, operation, and service instructions in this
manual.
• Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or
any other appliance.
• 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.
DO NOT DESTROY. PLEASE READ CAREFULLY. KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.
Revision: UBX-UBZ-UDX-UDZ-IOM (03-22) 1034344-C
Supersedes: UBX-UBZ-UDX-UDZ-IOM (01-22) 1034344-B
⚠ DANGER ⚠
FIRE OR EXPLOSION HAZARD
WHAT TO DO IF YOU SMELL GAS
Advertisement
Table of Contents
Troubleshooting
Related Manuals for Reznor UBX Series
Summary of Contents for Reznor UBX Series
- Page 1 Revision: UBX-UBZ-UDX-UDZ-IOM (03-22) 1034344-C Supersedes: UBX-UBZ-UDX-UDZ-IOM (01-22) 1034344-B UNIT HEATER INSTALLATION/OPERATION/MAINTENANCE MODEL UBX: STANDARD POWER VENT BLOWER TYPE MODEL UBZ: SEPARATED-COMBUSTION BLOWER TYPE MODEL UDX: STANDARD POWER VENT FAN TYPE MODEL UDZ: SEPARATED-COMBUSTION FAN TYPE ⚠ DANGER ⚠ FIRE OR EXPLOSION HAZARD •...
-
Page 2: Table Of Contents
TABLE OF CONTENTS GENERAL INFORMATION ..............3 References . -
Page 3: General Information
TABLE OF CONTENTS—CONTINUED MAINTENANCE ................37 Service Checklist . -
Page 4: Important Safety Information
GENERAL INFORMATION—CONTINUED 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 . -
Page 5: Installation Codes
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 Installation Codes . - Page 6 GENERAL INFORMATION—CONTINUED Heater Throw—Continued Table 2. Heater Throw Distances with Standard Horizontal Louvers at Mounting Heights of 5 to 18 Feet Distance Distance Distance Distance Distance Distance Distance Unit Size 6 14 30 −21° 7 16 40 −20° 8 18 45 −16° 9 20 57 −14° 9 20 59 −18° 10 22 65 −14° —...
-
Page 7: Mounting Height Requirements
Mounting Height Requirements ⚠ WARNING ⚠ If touched, the vent pipe and internal heater surfaces that are accessible from outside the heater will cause burns. Suspend the heater a minimum of 5 feet (1.5 meters) above the floor. • For best results, the heater should be mounted with certain rules in mind . In general, a unit should be located 8 to 12 feet (2 .4 to 3 .7 meters) above the floor . - Page 8 GENERAL INFORMATION—CONTINUED Dimensions—Continued NOTES: 1. * SIZES 150-400 - DIMENSION E VARIES WITH MOTOR SELECTION AND BELT ADJUSTMENT. 2. ** DIMENSIONS H AND K ARE THE HEATER SUSPENSION POINTS. VENT CONNECTION COMBUSTION AIR INLET THERMOSTAT VIEW CONNECTION 3/8” - 16 FEMALE REAR THREAD - FOUR VIEW...
- Page 9 Table 4. Dimensions—Models UBX and UBZ Dimension (See Figure Unit Size Inches (±1/16) (mm (±2)) 030, 13-3/4 13-13/16 17-3/16 40-3/32 25-17/32 17-3/8 1-9/16 22-1/2 6-15/32 3-1/2 2-21/32 5-31/32 3-5/16 (686) (349) (351) (254) (437) (1018) (649) (441) (40) (572) (164) (254) (152) (89)
-
Page 10: Clearances
GENERAL INFORMATION—CONTINUED Dimensions—Continued Table 5. Dimensions—Models UDX and UDZ Dimension (See Figure Unit Size Inches (±1/16) (mm (±2)) 030, 13-3/4 13-13/16 29-3/4 25-9/16 5-15/16 3-1/2 3-11/32 17-3/8 1-9/16 4-9/32 9-9/16 3-3/4 2-15/16 (349) (686) (254) (351) (756) (649) (152) (151) (89) (85) (441) -
Page 11: Combustion Air Requirements
Table 7. Unit Weights Unit Size Model Pounds (kg) (38) (40) (46) (49) (76) (78) (136) (145) (145) (175) (181) (208) (224) (230) (39) (41) (47) (49) (77) (78) (137) (146) (146) (175) (182) (208) (225) (230) (26) (28) (32) (34) (46) (48) -
Page 12: Acoustical Considerations
GENERAL INFORMATION—CONTINUED Combustion Air Requirements—Continued Table 8. Determining Confined Space Combustion Air Requirements Calculate Combustion Air Letter Air Source Required Opening Size Requirements 1 square inch free area per 1000 BTUh Add total BTUh of all appliances in Air inside building Never <100 square inches free area for each opening confined space and divide by figures at left for square inch free area size of... - Page 13 Table 10. Technical Data for UBX and UBZ Models (Unit Sizes 150–400) Unit Size Parameter Input heating capacity (BTUh) 150,000 175,000 200,000 225,000 250,000 300,000 350,000 400,000 Input heating capacity (kW) 43 .9 51 .2 58 .6 65 .9 73 .2 87 .8 102 .5 117 .1...
- Page 14 GENERAL INFORMATION—CONTINUED Acoustical Considerations—Continued Table 11. Technical Data for UDX and UDZ Models (Unit Sizes 030–125) Unit Size Parameter Input heating capacity (BTUh) 30,000 45,000 60,000 75,000 105,000 120,000 Input heating capacity (kW) 8 .8 13 .2 17 .6 22 .0 30 .8 35 .2 Thermal efficiency (%)
- Page 15 Table 12. Technical Data for UDX and UDZ Models (Unit Sizes 150–400) Unit Size Parameter Input heating capacity (BTUh) 150,000 175,000 200,000 225,000 250,000 300,000 350,000 400,000 Input heating capacity (kW) 44 .0 51 .3 58 .6 65 .9 73 .3 87 .9 102 .6 117 .2...
-
Page 16: Installation
INSTALLATION Unpacking and Inspection • The unit was test-operated and inspected at the factory prior to crating and was in operating condition . • It is important to note when uncrating the unit that shipping brackets are attached with cabinet screws . When removing shipping brackets, re-insert ALL screws into the cabinet . -
Page 17: Heater Suspension
Heater Suspension ⚠ WARNING ⚠ • Before suspending the heater, check the supporting structure to be used to verify that it has sufficient load-carrying capacity to support the weight (refer to Weights section) of the unit. • The heater must be level for proper operation. DO NOT place or add additional weight to a suspended heater. -
Page 18: Suspension Of Heater With Downturn Nozzle
INSTALLATION—CONTINUED Heater Suspension—Continued Suspension of Heater with Downturn Nozzle Downturn nozzle kits (option CD2, CD3, CD4, or CD5) require four-point suspension . Follow the instructions provided with the kit for downturn nozzle installation . Suspension of Heater Using CK10 Hanger Kit Option CK10 (four-point suspension) is for suspending the heater using swivel connectors connected to 1-inch pipe . -
Page 19: Heater Suspension Using Field-Supplied Threaded Rods
Heater Suspension Using Field-Supplied Threaded Rods The heater may be suspended from 3/8-inch threaded rods using four-point suspension . The recommended maximum rod length is 6 feet (1 .8 meters) . The length of the threaded rod extending into the heater MUST NOT exceed 1/2 inch (13 mm) . -
Page 20: Supply Piping Connections
INSTALLATION—CONTINUED Piping Connections—Continued Gas Supply Piping—Continued Table 14. Gas Supply Line Sizes Diameter of Pipe (Inches) 1-1/4 1-1/2 Length of Pipe Natural Natural Natural Natural Natural Natural Propane Propane Propane Propane Propane Propane (Feet) Cubic Feet per Hour 1100 2100 1281 1650 1007... -
Page 21: Electrical Connections
Table 15. Gas Connection Sizes Natural Gas Propane Unit Size Connection (Inches) 030–200 225–400 Connection size for a standard unit (not gas supply line size) . Electrical Connections ⚠ CAUTION ⚠ • Route wires so that they do not contact the flue wrapper or venter housing. •... - Page 22 INSTALLATION—CONTINUED Electrical Connections—Continued Rear View Standard Rear View Separated Power Vent Model Combustion Model NOTE: The size of heater illustrated has a vertical terminal strip. Some sizes have a horizontal terminal strip. Figure 10. Supply Wiring Entrance and Control Connection Terminal Strip •...
-
Page 23: Controls
CONTROLS NOTE: Refer to the TROUBLESHOOTING section for probable causes and reset instructions for the following controls. Locations for the following controls are shown in Figure 12 . Interlock Door Switch Disconnect Switch Electric Box Circuit Board Circuit Board Figure 12. Component Locations (Typical) Pressure Switch ⚠... - Page 24 CONTROLS—CONTINUED Pressure Switch—Continued • If a restriction or excessive flue length/turns cause the sensing pressure to be outside the pressure switch setpoint, the switch will function to shut off the main burner . The main burner will remain off until the system has cooled and/or the flue system resistance is reduced .
-
Page 25: High Temperature Limit Control
High Temperature Limit Control ⚠ WARNING ⚠ The automatic-reset high temperature limit control will continue to shut down the heater until the cause is corrected. Never bypass this control as hazardous conditions could result. All units are equipped with a temperature-activated, automatic-reset high temperature limit control (see Figure 12 for location) . -
Page 26: Thermostat Options
CONTROLS—CONTINUED Thermostat Options NOTES: • IMPORTANT: all units MUST be operated by a 24V thermostat. Never use a line voltage disconnect switch as a means of operating the heater. • The operation of unit sizes 030–125 by means other than by a 24V thermostat may result in the flame rollout switch tripping. -
Page 27: Operation
OPERATION ⚠ DANGER ⚠ • For your safety, read before operating. If you do not follow these instructions exactly, a fire or explosion may result, causing property damage, personal injury, or loss of life. • This appliance does not have a pilot. It is equipped with an ignition device which automatically lights the burner. - Page 28 OPERATION—CONTINUED Startup—Continued Figure 13) . 3 . Open access door and locate gas control (ON/OFF) knob or switch on gas valve (see Top View ON/OFF Switch Figure 13. Gas Valve ON/OFF Control 4 . Turn gas control switch to OFF or turn knob clockwise to OFF . 5 .
-
Page 29: Operating Sequences
Operating Sequences Table 17 Table 18 describes the heater’s normal operating sequence . describes the heater’s abnormal heat cycle Table 19 Table 25 functions . describes the heater’s fault modes . Refer to for LED indications . Table 17. Operating Sequence (Normal Heat Cycle) Step Condition Action... - Page 30 OPERATION—CONTINUED Operating Sequences—Continued Table 18. Operating Sequence (Abnormal Heat Cycle) Abnormal Condition Action Function Control runs venter motor for post-purge period Thermostat demand for heat is removed before flame is recognized All outputs are deenergized Interrupted thermostat Control deenergizes gas valve Thermostat demand for heat is call for heat Control runs venter motor through post-purge period...
-
Page 31: Vent System Testing
Table 19. Fault Modes Fault Mode Condition Action Control runs venter motor and runs fan/blower motor on heat speed When flame is no longer sensed, venter motor runs through post-purge and fan/ Flame is sensed longer than Undesired blower motor runs through selected delay OFF time 20 seconds while gas valve is flame deenergized... -
Page 32: Post-Startup Checklist
OPERATION—CONTINUED Post-Startup Checklist Check the following after startup: ‰ Ensure that vent system has been tested in accordance with Vent System Testing section ‰ With unit in operation, measure manifold (outlet) gas pressure in accordance with Measure and Adjust Manifold (Outlet) Gas Pressure section ‰... -
Page 33: Measure And Adjust Manifold (Outlet) Gas Pressure
Measure and Adjust Manifold (Outlet) Gas Pressure If the heater is being installed at an elevation ≤2,000 feet (≤610 meters), adjust the manifold (outlet) gas pressure in Measure and Adjust Manifold Gas Pressure—Elevation ≤2,000 Feet (≤610 Meters) accordance with the section . - Page 34 ADJUSTMENTS—CONTINUED Measure and Adjust Manifold (Outlet) Gas Pressure—Continued Measure and Adjust Manifold Gas Pressure—Elevation ≤2,000 Feet (≤610 Meters)—Continued REGULATOR 1/8" OUTLET SCREW REGULATOR PRESSURE SCREW INLET PRESSURE 1/8" OUTLET INLET PRESSURE PRESSURE SINGLE-STAGE VALVES HIGH-FIRE LOW-FIRE REGULATOR SCREW REGULATOR SCREW INLET PRESSURE TAP 1/8"...
-
Page 35: Measure And Adjust Manifold Gas Pressure-Elevation >2,000 Feet (>610 Meters)
Measure and Adjust Manifold Gas Pressure—Elevation >2,000 Feet (>610 Meters) For installations at high elevations, measure and adjust the manifold (outlet) gas pressure as follows: 1 . If installation is at elevation >6,000 feet (1,830 meters), replace pressure switch in accordance with Pressure Switch Replacement section . - Page 36 ADJUSTMENTS—CONTINUED Measure and Adjust Manifold (Outlet) Gas Pressure—Continued Measure and Adjust Manifold Gas Pressure—Elevation >2,000 Feet (>610 Meters)—Continued Table 21. Inputs and Capacities by Elevation in US Unit Size Elevation Value (Feet (Meters)) BTUh 30,000 45,000 60,000 75,000 105,000 120,000 150,000 175,000 200,000 225,000 250,000 300,000 350,000 400,000 0–2000 24,600 37,350 49,800 62,250 88,200 100,800 124,500 145,250 166,000 186,750 207,500 249,000 290,500 332,000...
-
Page 37: Maintenance
MAINTENANCE ⚠ WARNING ⚠ If you turn OFF the electrical power supply, turn OFF the gas. ⚠ CAUTION ⚠ • Eye protection is recommended when cleaning unit. • When any service is completed, ensure that the unit is reassembled correctly so that no unsafe conditions are created. - Page 38 MAINTENANCE—CONTINUED Maintenance Procedures—Continued Burner Maintenance—Continued Figure 16. Typical Burner Assembly 1. Remove gas and electric supply: a . Shut OFF gas supply ahead of union at manual shutoff valve outside cabinet . b . Turn OFF electric supply . c . Disconnect gas supply at union outside of cabinet . ⚠...
- Page 39 e . Locate burner body supports—depending on size, burner will have two or more supports . f . At each support, remove one screw that secures support to secondary air shield . g . While holding venturi tube, slide entire burner assembly slightly to right to disengage burner from supports on left . h .
-
Page 40: Burner Orifice Maintenance
MAINTENANCE—CONTINUED Maintenance Procedures—Continued Burner Orifice Maintenance The burner orifice usually needs to be replaced only when installing a gas conversion kit . When ordering a replacement orifice only, provide BTUh content and specific gravity of gas as well as the model and serial number of the unit . When removing or replacing the burner orifice, take care not to damage the venturi tube and/or the bracket . -
Page 41: Maintenance Of Fan Motor, Fan Blades, And Fan Guard
Maintenance of Fan Motor, Fan Blades, and Fan Guard Inspect and clean the motor, fan guard, and blades . Remove any dirt and grease . Take care when cleaning the fan blades so as prevent causing misalignment or imbalance . Check to ensure that the hub of the fan blades is secure to the shaft . -
Page 42: Venter Motor And Wheel Assembly Maintenance
MAINTENANCE—CONTINUED Maintenance Procedures—Continued Venter Motor and Wheel Assembly Maintenance NOTES: • Venter motor bearings are permanently lubricated. • Keep all hardware removed to be used in reassembling and installing the replacement parts. Remove dirt and grease from the motor casing, venter housing, and venter wheel . Replace the venter motor and wheel assembly as follows: 1 . -
Page 43: Operating Gas Valve Maintenance
Combination Gas Valve Maintenance ⚠ WARNING ⚠ The combination gas valve is the prime safety shutoff. All gas supply lines must be free of dirt or scale before connecting to the unit to ensure positive closure. Inspect the combination gas valve, carefully remove any external dirt accumulation, and check wiring connections . Check the valve annually to ensure that the valve is shutting off gas flow completely as follows: 1 . -
Page 44: Flame Rollout Switch Maintenance (Model Udz Unit Sizes 030-125 Only)
MAINTENANCE—CONTINUED Maintenance Procedures—Continued Flame Rollout Switch Maintenance (Models UDX and UDZ Unit Sizes 030–125 Only) • The cause of a flame rollout switch (see Figure 20) activating must be determined . See Figure 12 for flame rollout switch location . Activation of the manually-reset flame rollout switch could be caused by one or more of the following: •... - Page 45 —Continued Table 24. General Troubleshooting Symptom Probable Cause Remedy Burner will 1 . Manual valve not open Open manual valve not light 2 . Air in the gas line Bleed gas line (initial startup only) 3 . Gas pressure too high or too low Supply pressure should be 5–14 IN WC for natural gas or 11–14 IN WC for propane 4 .
-
Page 46: General Troubleshooting
TROUBLESHOOTING—CONTINUED General Troubleshooting—Continued Table 24. General Troubleshooting —Continued Symptom Probable Cause Remedy Fan or 1 . Motor overload device cycling ON and Check motor load against motor rating plate—replace motor if needed venter motor turns ON and OFF while burner is operating Fan or 1 . - Page 47 Figure 21. DSI Control Module Troubleshooting Flowchart UBX-UBZ-UDX-UDZ-IOM (03-22) 1034344-C...
-
Page 48: Installation Record (To Be Completed By Installer)
INSTALLATION RECORD (TO BE COMPLETED BY INSTALLER) Installer: Name ________________________________________________________ Company ________________________________________________________ Address ________________________________________________________ ________________________________________________________ Phone ________________________________________________________ Distributor (company from which the unit was purchased): Company ________________________________________________________ Contact ________________________________________________________ Address ________________________________________________________ ________________________________________________________ Phone ________________________________________________________ Model ________________ Serial No.______________________________ Date of Installation ____________ Specific installation notes (i.e., location, amps, gas pressure, temperature, voltage, adjustments, warranty, etc.): ________________________________________________________________________________________ ________________________________________________________________________________________...
Need help?
Do you have a question about the UBX Series and is the answer not in the manual?
Questions and answers