Laars MLXC Boiler/Water Heater Manuals

Manuals and User Guides for Laars MLXC Boiler/Water Heater. We have 1 Laars MLXC Boiler/Water Heater manual available for free PDF download: Service Manual

Laars MLXC Service Manual

Laars MLXC Service Manual (94 pages)

Brand: Laars | Category: Industrial Equipment | Size: 8 MB

Table of Contents

Table of Contents
3
How to Use the Troubleshooting Information
7
Identifying Your Unit
7
Finding Information in this PDF File
8
Safety Notes
9
Removing the Covers
12
Part Locations
13
Sensor and Switch Locations
14
Access to Control Board
15
Control Panel
16
Control Display
17
Operating Displays
18
Operating Displays - Examples
19
Notifications, Blocking, Lockout, And Error Displays
20
Changing Setpoints
22
Installer and Service Mode Displays
23
Quick Checkout Procedure
25
A2 Lockout Codes
28
Notification Codes
33
Unit Is Running, But Building Is Still Cold
35
Short-Cycling
36
Unit Is Noisy
37
Troubleshooting the 120V AC Power Supply
39
Troubleshooting the 24V DC Power Supply
41
Inlet Water Temperature Sensor
42
Outlet Water Temperature Sensor
43
System Sensor
44
DHW Sensor
44
Outdoor Sensor
44
Flue Temperature and Flue Safety Sensors
45
Testing the Temperature Sensors
47
Water Pressure Switch
48
Blower Problems
49
Air Pressure Switch
51
Gas Valve
53
Condensate Trap
54
Pressure Relief Valve
55
Direct Spark Ignition
56
Pump Problems
58
Outdoor Reset
59
Low Water Cutoff Switch
61
DHW Problems - Combi Units (MLXC)
63
DHW Temperature Sensor
64
DHW Flow Sensor (Hall Sensor)
65
Three-Way Valve
66
Flat Plate Heat Exchanger
67
Hot Water Problems - Indirect Tank (MLXH)
68
B26 DHW Problems - Indirect Tank with Aquastat (MLXH)
69
B27 DHW Problems - Indirect Tank with Sensor (MLXH)
70
Cascade Setup
71
External Modulation Control (BMS)
72
Replacing the SIT Control Board
73
Annual Service Procedure
75
Section C - Combustion Setup
77
C1 about Correct Combustion
77
Combustion Adjustment Procedure
78
Troubleshooting Combustion Problems
80
Cleaning the Burner and Heat Exchanger
81
Appendix Sect. Title Page App1 SIT Parameter Codes
83
Lockout Codes
83
Blocking Codes
83
Notification Codes
84
Installer Mode Parameters
85
App2 Ignition And Firing Sequence
88
App3 Wiring Diagrams
89
App4 Gas Conversion Procedure
92

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