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Laars NeoThem NTH Manuals
Manuals and User Guides for Laars NeoThem NTH. We have
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Laars NeoThem NTH manual available for free PDF download: Service Manual
Laars NeoThem NTH Service Manual (118 pages)
Modulating Boiler Sizes 399-850 MBTU/h, Water Heater Sizes 399-850 MBTU/h
Brand:
Laars
| Category:
Boiler
| Size: 14.09 MB
Table of Contents
Safety Notes
5
Table of Contents
7
Section a - Troubleshooting - Start here
11
Troubleshooting - Start here
11
Unit will Not Fire - Blower Is Not Running
12
Unit will Not Fire, Blower Is Not Running
12
Blower Runs Continuously, no Display
14
Control Unit Is in "Standby" Mode
15
A4 Control Unit Is in "Standby" Mode
16
A5 Changing Control Settings, Change Not Complete
17
Unit with Original (White) User Interface
17
A5 Changing Control Settings, Change Not Complete, Original (White) User Interface
17
Unit Is Running, but Building Is Still Cold
18
Control Unit Says "Run" but Boiler Is Not Firing
19
Control Unit Says "Run", but Boiler Is Not Firing
19
Open Safety Chain - Fault #63
19
A10 Unit Is Noisy
20
A9 Unit Runs in High or Low Fire Only
20
Unit Is Noisy
20
Current User Interface
20
Section B - Troubleshooting Procedures
21
Quick Check of Components in the Safety Chain
21
B1 Quick Check of Components in the Safety Chain
22
Troubleshooting the 24V AC Power Supply
25
B3 Checking the Safety Interlocks
26
Checking the Low Water Cutoff Switch
28
Controller for Low Water Cutoff
29
B6 Removing and Replacing the Low Water Cutoff Switch
30
Checking the Flow Switch
32
High Water Temperature Limit Switch
32
Testing the Flow Switch
33
Removing and Replacing the Flow Switch
34
Removing and Replacing the Gas Valve
36
Checking the High Gas Pressure Switch
39
Checking the Low Gas Pressure Switch
40
Testing the Low Gas Pressure Switch
41
B15
42
Removing and Replacing the High and Low Gas Pressure Switches
42
Checking the Condensate Trap Water Level Switch
45
Removing and Replacing the Condensate Trap
46
Testing the Condensate Trap Level Switch
46
B19
48
Checking the Air Pressure Switch - Blower Proving Switch
48
Removing and Replacing the Air Pressure Switch
49
Test Procedure for Air Pressure Switch
49
B21 Removing and Replacing the Air Pressure Switch
50
Checking the Blower
51
Removing and Replacing the Blower
52
High Stack Temperature Fault
56
B25
57
Removing and Replacing the Stack Temperature Limit Switch
57
Checking the DHW Sensor
58
Checking the System Sensor
58
B29
59
Removing and Replacing the Inlet Water Temperature Sensor
59
Inlet Water Temperature Sensor
59
B31
60
Removing and Replacing the Outlet Water Temperature Sensor
60
Outlet Water Temperature Sensor
60
Testing the Temperature Sensors
61
Servicing the Transformer
62
Troubleshooting the Outdoor Reset System
62
Removing and Replacing the Pressure Relief Valve
64
Ignitor Assembly
65
B37 Flame Sensor
66
Flame Sensor
66
Pump Fault
67
Section C - Possible Combustion Problems
69
About Correct Combustion
69
Units with Original (White) User Interface
70
Combustion Adjustment Procedure - Units with Current User Interface
72
Troubleshooting Combustion Problems
74
Cleaning the Burner and Heat Exchanger
75
C5 Cleaning the Burner and Heat Exchanger
76
Section D - Using the Neotherm Control System
83
Identifying the User Interface on Your Unit
83
Using the Original (White) User Interface
84
Reacting to Lockouts on the Original (White) User Interface
86
Removing and Replacing the Original (White) User Interface
87
Using the Current User Interface
88
Reacting to Lockouts on the Current User Interface
94
Removing and Replacing the Current User Interface
95
When to Replace a SOLA Controller
96
D7 Removing and Replacing the Current User Interface
96
Removing and Replacing the SOLA Controller
97
D9 Removing and Replacing the SOLA Controller
98
Appendix Sect. Title Page App1 Error Codes
99
App2 Ignition and Firing Sequence
114
App3 Wiring Diagram
115
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