Laars NeoTherm NTH Installation and operation instructions manual - page 2
LAARS Heating Systems
Page 2
TABLE OF CONTENTS
SECTION 1.
General Information
1.1
Introduction ...................................................... 3
1.2
Model Identification ......................................... 3
1.3
Appliance Overview ......................................... 3
1.4
Warranty .......................................................... 3
1.5
Unpacking ....................................................... 4
1.6
Dimensions ...................................................... 4
1.7
Locating the Appliance .................................... 4
1.8
Locating Appliance for Correct Vent Distance
from Outside Wall or Roof Termination ........... 8
SECTION 2.
Venting and Combustion Air
2.1
Combustion Air ................................................ 8
2.1.1
Combustion Air From Room ............................ 8
2.1.2
Intake Combustion Air ..................................... 9
2.2
Venting ............................................................ 9
2.3
Locating Vent & Combustion Air Terminals ... 10
2.3.1
Side Wall Vent Terminal ................................ 12
2.3.2
Side Wall Combustion Air Terminal ............... 12
2.3.3
Vertical Vent Terminal ................................... 12
2.3.4
Vertical Combustion Air Terminal .................. 12
2.3.5
Installations in the Commonwealth
of Massachusetts .......................................... 12
2.4
Common Vent Test ....................................... 13
SECTION 3.
Gas Supply and Piping
3.1
Gas Supply and Piping .................................. 13
SECTION 4.
Water Connections
4.1
Heating System Piping:
Hot Supply Connections ................................ 14
4.2
Cold Water Make-Up ..................................... 14
4.3
Freeze Protection .......................................... 15
4.4
Recognized Chemicals .................................. 17
SECTION 5.
Electrical Connections
5.1
Main Power ................................................... 22
5.2
Control Features ............................................ 22
5.2.1
User Mode ..................................................... 22
5.2.1.1 Temperature Control Point Adjustment ......... 22
5.2.1.2 Direct Hot Water Control Point Adjustment ... 22
5.2.2
Setup Mode ................................................... 22
5.2.2.1 Adjusting the Temperature Display
Units in °F or °C ............................................. 23
5.2.2.2 Adjusting the Outdoor Reset On or Off .......... 23
5.2.2.3 Adjusting Low Boiler Temperature Setpoint .. 23
5.2.2.4 Adjusting High Outdoor Temperature
Setpoint ......................................................... 23
5.2.2.5 Adjusting Low Outdoor Temperature
Setpoint ......................................................... 23
5.2.2.6 Anti Short Cycle Time .................................... 23
5.2.3
Diagnostic Mode ............................................ 23
5.2.3.1 High Limit Setting .......................................... 23
5.2.3.2 DHW Limit Setting ......................................... 23
5.3
Pump Connections ........................................ 24
5.4
Temperature Control ..................................... 24
5.5
Temperature Control - Indirect Tank ............. 24
5.6
Outdoor Reset Operation .............................. 24
5.7
External Control Connections ........................ 25
5.8
Wiring Diagram .............................................. 27
SECTION 6.
Operating Instructions
6.1
Filling the Boiler System ................................ 27
6.2
Operating the Burner and Set Up .................. 27
6.2.1
Burner Operation ........................................... 28
6.2.2
Boiler Setpoint and Adjustment ..................... 29
6.3
Shutting Down the NeoTherm ....................... 29
6.4
To Restart the NeoTherm .............................. 29
SECTION 7.
Maintenance
7.1
System Maintenance ..................................... 30
7.2
Appliance Maintenance and
Component Description ................................. 31
7.2.1
Burner ............................................................ 31
7.2.2
Modulating Gas Valve / Venturi ..................... 31
7.2.3
Appliance Control .......................................... 31
7.2.4
Ignitor Assembly ............................................ 31
7.2.5
Flame Sensor ................................................ 31
7.2.6
Transformers ................................................. 32
7.2.7
Blower ........................................................... 32
7.2.8
Heat Exchanger Coils .................................... 32
7.2.9
Gas Pressure Switches
(optional)
................... 33
SECTION 8.
Trouble Shooting
8.1
Sequence of Operation ................................. 33
8.2
Short Cycling ................................................. 33
8.3
Error Codes ................................................... 33
SECTION 9.
Replacement Parts
9.1
General Information ....................................... 35
9.2
Parts List ....................................................... 36