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Reznor Heater RZUDZ45

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Revision: UBX-UBZ-UDX-UDZ-IOM (07-23) 1034344-K

GAS-FIRED UNIT HEATER INSTALLATION, OPERATION,

AND MAINTENANCE

Supersedes: UBX-UBZ-UDX-UDZ-IOM (02-23) 1034344-J

MODELS UBX, UBZ, UDX, AND UDZ

⚠ 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 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.

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.

DO NOT DESTROY. PLEASE READ CAREFULLY. KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.

UBX-UBZ-UDX-UDZ-IOM (07-23) 1034344-K

TABLE OF CONTENTS

GENERAL INFORMATION ................................................................... 3

References .............................................................................. 3

Important Safety Information................................................................. 4

Warranty ................................................................................ 4

Model Configuration ....................................................................... 4

Certification .............................................................................. 5

Installation Codes ......................................................................... 5

Heater Location........................................................................... 5

Heater Throw .......................................................................... 6

Mounting Height Requirements ............................................................ 7

Hazards of Chlorine ..................................................................... 7

Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Clearances ............................................................................. 10

Weights ................................................................................ 11

Combustion Air Requirements .............................................................. 11

INSTALLATION ........................................................................... 12

Unpacking and Inspection.................................................................. 12

Pre-Installation Checklist................................................................... 12

Heater Suspension ....................................................................... 13

Suspension of Heater Using Option CK8 or CK10 Hanger Kit.................................... 14

Suspension of Heater Using Option CK22 Hanger Kit .......................................... 15

Heater Suspension Using Field-Supplied Threaded Rods....................................... 15

Suspension of Heater with Downturn Nozzle ................................................. 15

Vent Connections ........................................................................ 15

Piping Connections ....................................................................... 15

Gas Supply Pressure ................................................................... 15

Gas Supply Piping ..................................................................... 16

Supply Piping Connections .............................................................. 16

Electrical Connections..................................................................... 17

CONTROLS .............................................................................. 19

Pressure Switch ......................................................................... 19

High Temperature Limit Control ............................................................. 21

Flame Rollout Switch (UDX and UDZ Model Unit Sizes 030–125) ................................... 21

Interlock Door Switch (UBZ and UDZ Models) .................................................. 21

Combination Gas Valve.................................................................... 21

Fan Motor .............................................................................. 21

Venter Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Thermostat Options....................................................................... 22

Circuit Board (DSI Control Module)........................................................... 22

OPERATION ............................................................................. 23

Pre-Startup Checklist ..................................................................... 23

Startup................................................................................. 23

Operating Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Vent System Testing ...................................................................... 27

Post-Startup Checklist..................................................................... 28

ADJUSTMENTS........................................................................... 28

Pressure Switch Replacement .............................................................. 28

Measure and Adjust Manifold (Outlet) Gas Pressure ............................................. 29

Measure and Adjust Manifold Gas Pressure—Elevation ≤2,000 Feet (≤610 Meters) .................. 29

Measure and Adjust Manifold Gas Pressure—Elevation >2,000 Feet (>610 Meters) .................. 31