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Gas Heater
UBX
Reznor UBX Manual
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Figure 9.
Concentric Adapter Bo
x Dimensions and Connections
1-7/8”
(48mm)
6-3/16”
(157mm)
2”
(51mm)
9-1
1/32” (237mm)
5-1
1/23”
(136mm)
8” diameter Collar for
Combustion
Air Pipe
6” diameter Collar for
Combustion
Air Pipe
6” diameter Collar for
Combustion
Air Pipe
14-3/8”
(365mm)
4-3/32”
(104mm)
5-9/32”
(134mm)
6-1/8”
(156mm)
6-1/8”
(156mm)
1-1/16” (27mm)
16” (406mm)
17” (432mm)
Opening for 4”
diameter V
ent Pipe
Silicone
Ring
To
p
View
Heater
Side
View
19
I-UEZ (04-21) 1034347-0
18
20
Table of Contents
Table of Contents
2
General Information
4
References
4
Important Safety Information
4
Certification
5
Warranty
5
Installation Codes
5
Unit Location
5
Heater Throw
6
Mounting Height Requirements
7
Hazards of Chlorine
7
Dimensions
7
Clearances
8
Weights
9
Venting and Combustion Air Requirements
9
Vent/Combustion Air System Piping Requirements
9
Vent/Combustion Air System Piping Joints
11
Vent/Combustion Air System Piping Support
12
Technical Data
13
Installation
14
Unpacking and Inspection
14
Pre-Installation Checklist
14
Heater Suspension
15
Suspension of Heater with Downturn Nozzle
15
Piping Connections
16
Gas Supply Pressure
16
Gas Supply Piping
16
Supply Piping Connections
17
Concentric Adapter Box Connections
18
Vent Terminal Options
20
Vertical Vent Terminal (Option CC2) Installation
20
Horizontal Vent Terminal (Option CC6) Installation
24
Condensate Drain Installation
28
Vent Condensate Drain Installation
29
Heat Exchanger Condensate Drain Installation
32
Electrical Connections
32
Controls
33
Thermostat Options
34
Main Operating Gas Valve
35
Pressure Switch
35
High Temperature Limit Control
35
Vent Temperature Limit Switch
36
Interlock Door Switch
36
Fan Motor
36
Circuit Board (DSI Control Module)
36
Venter Motor
36
Operation
37
Pre-Startup Checklist
37
Startup
38
Startup Procedure
38
Operating Sequences
39
Vent System Testing
41
Post-Startup Checklist
42
Adjustments
42
Pressure Switch Replacement
42
Measure and Adjust Manifold (Outlet) Gas Pressure
43
Measure and Adjust Manifold Gas Pressure-Elevation ≤2,000 Feet (≤610 Meters)
43
For Installations at High Elevations, Measure and Adjust the Manifold (Outlet) Gas Pressure as Follows
45
Converting Unit from Natural Gas to Propane
46
Maintenance
47
Service Checklist
47
Maintenance Procedures
48
Burner Maintenance
48
Burner Orifice Maintenance
50
Heat Exchanger Maintenance
50
Ignition System Maintenance
50
Maintenance of Fan Motor, Fan Blades, and Fan Guard
51
Venter Motor, Wheel, and Pressure Sensing Tap Maintenance
52
Operating Gas Valve Maintenance
53
Pressure Switch Maintenance
53
High Temperature Limit Control Maintenance
53
Interlock Door Switch Maintenance
53
Transformer Maintenance
53
Vent Temperature Limit Switch Maintenance
54
Disconnect Switch Replacement
54
Vent or Vent/Combustion Air System Maintenance
54
Condensate Drain System
54
Troubleshooting
54
Unit Troubleshooting Using DSI Control Module
54
General Troubleshooting
56
Installation Record (to be Completed by Installer)
60
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Reznor UBX Specifications
General
Brand
Reznor
Model
UBX
Category
Gas Heater
Language
English
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