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LAARS HEATING SYSTEMS
TABLE OF CONTENTS
SECTION 1.
General Information
1A. Introduction ................................................... 3
1B. Codes and Standards ................................... 3
1C. Unpacking the Appliance .............................. 4
1D. Locating the Appliance.................................. 4
1E. Clearances ................................................... 4
SECTION 2.
Venting Options
2A. Direct Vent Kits ............................................. 4
2B. Installing Direct Vent Kits .............................. 4
2C. Locating the Vent on an Outside Wall........... 4
2D. Stainless Steel Single Pipe Horizontal
and Vertical Vents......................................... 7
2E. Air Source for Combustion
(when not direct vented) ...............................7
2F. Connecting Special Gas Vent
to the Appliance ............................................ 8
2G. Securing Special Gas Vent ........................... 8
SECTION 3.
Gas Piping
3A. Gas Piping .................................................... 8
3B. Domestic Water Piping (EBP only) ............... 9
SECTION 4.
Hydronic Heat Piping
4A. Hydronic Piping........................................... 10
4B. Using in a Combined Hot Water
Heating and Chilled Water
Cooling System........................................... 12
4C. Water Quality and Treatment...................... 13
SECTION 5.
Electrical Connections
5A. Electrical Connections ................................ 13
SECTION 6.
Boiler Start-UpP
6A. Common Vent Test..................................... 17
6B. Filling the System ....................................... 18
6C. Firing Burner ............................................... 18
6D. Mode and On/Off Buttons Operation .......... 19
SECTION 7.
Maintenance and Component Description
7A. Unit Pump................................................... 19
7B. Gas Valve ................................................... 19
7C. Safety Limit Switch ..................................... 19
7D. Operating Control Printed Circuit
Board (PCB) ............................................... 19
7E. Igniter / Flame Sensor Assembly ................ 20
7F. Transformer ................................................ 20
7G. Blower ........................................................ 20
7H. Transfer Tank (EBP only) ........................... 20
7I. Thermostatic Union (EDP/EDN only) .......... 20
7J Cleaning the Boiler Coil .............................. 20
SECTION 8.
Servicing
8A. Sequence of Operation ............................... 21
8B. Trouble Shooting - Fault Codes .................. 22
8B-1. Fault Code Identification.................... 22
8B-2. Fault Correction................................. 22
8B-3. Resolving Lockouts ........................... 22
Fault Trees ................................................. 23
SECTION 9.
Gas Valve Calibration
9A. Gas Valve Calibration ................................. 31
SECTION 10.
Symptom Evaluations
10A. Delayed Ignition .......................................... 31
10B. Short Cycling .............................................. 32
10C. Noisy Operation .......................................... 32
10D. Insufficient Hot Water (EBP only) ............... 32
10E. High Gas Consumption............................... 33
SECTION 11.
Parts Identification.......................................... 34