A.O. Smith series 121 Manuals

Manuals and User Guides for A.O. Smith series 121. We have 2 A.O. Smith series 121 manuals available for free PDF download: Installation Instructions Manual, Service Handbook

A.O. Smith series 121 Installation Instructions Manual (60 pages)

RESIDENTIAL CONDENSING GAS WATER HEATERS

Brand: A.O. Smith | Category: Water Heater | Size: 7 MB

Table of Contents
2
Completed Installation (Typical)
3
Important Safety Information
4
Do Not Operate if Damaged
4
Hydrogen Gas Flammable
4
Limiting the Risk of Scalding
4
Warning Messages
5
Risks During Installation and Maintenance
6
Risks During Operation
6
Water Contamination Risk
7
Fire Risk
7
Explosion Risk
7
Carbon Monoxide Risk
8
Introduction
10
Abbreviations Used
10
Qualifications
10
Qualified Installer or Service Agency
10
Important Definitions
10
Preparing for Installation
11
Massachusetts Installation Requirements
12
Manufacturer Requirements - Gas Equipment Venting System Not Provided
12
Features and Components
13
Model Characteristics
15
Controls and Switches
15
Control Module
15
Pressure Switches
15
Outlet Air Pressure Switch (OAPS)
15
Intake Air Pressure Switch (IAPS)
15
Hot Surface Igniter (HSI)
15
Flame Sensor
15
Getting Started
16
Before You Begin
16
Recommended Accessories
16
Rough-In Dimensions
17
Verify that Your Home Is Equipped and Up-To-Date for Proper Operation
18
Water Pressure
18
Water Pressure Increase Caused by Thermal Expansion
18
Water Pipe and Tank Leaks
18
Water Temperature Regulation
18
Verify that the Location Is Appropriate
19
Removing the Old Water Heater
20
Combustion Air and Ventilation
21
Corrosion and Water Quality
21
Install Shut-Off and Thermostatic Mixing Valves
21
Installing the Vent System
22
Planning the Vent System
22
Vent Kit
22
Vent Pipe Material
23
Vent Pipe Length and Sizing
23
Polypropylene Vent Systems
23
Vent Pipe Runs
24
Vent Pipe Installation
24
Vent Screens
24
Installing the Exhaust/Condensate Tee
24
Important Notes and Warnings
25
Power Direct Venting (PDV)
25
Direct Vent Air Intake Moisture Protection
25
Termination Clearances Sidewall Power Vent
26
Side Wall Vent Termination (Standard)
27
Roof Vent Termination (Standard)
27
Side Wall Vent for Cold Climates
27
Concentric Vent Termination
27
Multiple Concentric Vent Termination
28
Low Profile Vent Installation
29
Calculating Equivalent Feet (PDV)
30
Installing a New Tee Termination
31
Installing a New 90° Termination
31
Power Vent (PV)
31
Termination Clearances Other than Sidewall Direct Vent
32
Calculating Equivalent Feet (PV)
34
Vent Installation
34
Condensate (Exhaust)
34
Installing the Water Heater
35
Water Line Connections
35
Thermostatic Point-Of-Use Mixing Valves
35
Closed Water Systems
36
Thermal Expansion
36
Temperature-Pressure Relief Valve
37
T&P Valve Discharge Pipe
37
Space Heating Applications
38
Combo Heating
38
System Requirements
38
Combo Heating Installation
39
Electrical Installation
39
Grounding Instructions
39
Electrical Supply
39
Dedicated Power Wiring and Breakers
39
Power Fluctuations and Electrical Noise
39
Electrical Wiring
40
Making the Electrical Connections
40
Gas Supply System Installation
40
Gas Supply Regulator
40
Gas Line Installation
41
Gas Line Sizing
42
Gas Supply Line Leak Testing
43
Gas Supply Line Purging
43
Water Heater Gas Leak Testing
43
High Altitude Installations
43
Connecting the Water Supply
43
Installation Checklist
44
Water Heater Location
44
Gas Supply and Piping
44
Vent Pipe System
44
Vent Termination
44
Vertical
44
Water System Piping
44
Electrical Connections
44
Start up and Operations
45
Start up Conditions
45
Smoke/Odor
45
Prior to Start up
45
Filling the Water Heater
45
Initial Start up
45
Required Test Equipment
45
Preparation
45
Lighting the Water Heater
46
Temperature Regulation
47
Temperature Control
47
Hot Water Can Scald
47
High Temperature Applications
48
High Temperature Limit Control (ECO)
48
Control System Operation
49
Icons
49
Buttons
49
On/Off
49
Lock/Unlock
49
Temperature Setpoint
49
Normal Mode / Vacation Mode
49
Burner in Operation
49
Switching between Temperature Units
49
Fault Indication
49
Maintenance
50
Venting System Inspection
50
Draining and Flushing
50
Draining the Storage Tank
50
Flushing the Storage Tank
50
Sediment Removal
51
Lime Scale Removal
51
Chemical Lime Scale Removal
51
Burner Operation and Inspection
51
Combustion Chamber and Burner Cleaning
51
Housekeeping
52
Maintain Minimum Clearances
52
Anode Rod Maintenance
52
Temperature-Pressure Relief Valve Test
52
Service
53
Troubleshooting
54
Service Mode
54
Outlet Air Pressure Switch (OAPS)
54
Intake Air Pressure Switch (IAPS)
54
Basic Sequence of Operation
55
Call for Heat
55
Monitor Flame Current
55
Burner Ignition Sequence
55
Water Leak Detection
55
Clearing Error Codes
56
Error Priority
57
Checking for Leaks
57
Diagrams
58
Wiring Diagram
58
Service Parts List
59

A.O. Smith series 121 Service Handbook (40 pages)

COMMERCIAL GAS WATER HEATERS

Brand: A.O. Smith | Category: Heater | Size: 4 MB

Table of Contents
2
Introduction
3
- Qualifications
  3
- Service Warning
  3
- Service Reminder
  3
Requirements
4
- Instruction Manual
  4
- Tools Required
  4
- Tools Optional
  4
Installation Considerations
5
Operation and Service
12
- Sequence of Operation
  12
- Electrical Sequence
  13
- Wiring Diagram
  14
- Operating Sequence - Flow Chart
  15
- Gas Control Valve
  16
Gas Control Valve/Burner Area View
18
Blower Prover Switch - Settings
19
Thermostat and Ignition Control Board View
20
White Rodgers Integrated Control - Thermostat
21
White Rodgers Ignition Control Board
21
Pre-Service Checklist
22
Troubleshooting
23
Ignition Control Board: Error Codes
23
- Flash
  23
- Flashes
  23
- Flashes
  24
- Flashes
  25
- Continuous Flash
  25
- Continuous on
  25
Integrated Heater Control: Display Lights
26
Test 1: 120 VAC to Heater Check
27
Test 2: Polarity Check
28
Test 3: Continuity Check of High Limit (ECO)
29
Test 4: Upper Temperature Probe Continuity Check
30
Test 5: Calling for Heat - no Blower Operation
31
Test 6: Blower On, no Ignition
32
Test 7: Blower On, Blower Prover Switch Closed, no Igniter Operation
33
Test 8: Igniter Heats, no Main Burner
34
Test 9: Igniter Heats, no Main Burner
35
Test 10: Main Burner Ignition for Less than Five Seconds
36
Test 11: Water Heater Shutting off below Setting
37

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