Page 2 LAARS Heating SystemsTABLE OF CONTENTSSECTION 1.General Information1.1 Introduction ................................................... 31.2 Codes and Standards ................................... 31.3 Unpacking the Appliance .............................. 41.4 Locating the Appliance ................................. 41.5 Clearances ................................................... 4SECTION 2.Venting Options2.1 Concentric Direct Vent ................................. 52.1.1 Concentric Vent Description ......................... 52.1.2 Laars Concentric Vent Kits ........................... 52.1.3 Horizontal Concentric Vent Location ............ 52.2 Stainless Steel Single Pipe Horizontaland Vertical Vents — Category IV ................ 92.3 Air Source For Combustion (when notducted to the Endurance) ........................... 112.3.1 Air From Inside the Building ....................... 112.3.2 All Air From Outdoors ................................. 112.3.3 Connecting Special Gas Vent to theAppliance .................................................... 122.4 Non-Concentric Combustion Air ................. 12SECTION 3.Gas Piping3.1 Gas Piping .................................................. 123.2 Domestic Water Piping (EBP only) ............. 133.3 Anti-Freeze — Domestic Water .................. 14SECTION 4.Hydronic Heat Piping4.1 Hydronic Piping .......................................... 144.2 Using in a Combined Hot Water Heatingand Chilled Water Cooling System ............. 174.3 Water Quality and Treatment ..................... 174.4 Anti-Freeze ................................................. 174.4.1 Endurance Boiler LowTemperature Feature ................................. 174.4.2 Anti-Freeze Boiler Additives ....................... 17SECTION 5.Electrical Connections5.1 Electrical Connections ................................ 20SECTION 6.Using the Boiler Control6.1 Front Panel Display .................................... 226.2 Control Logic .............................................. 226.3 View Menu .................................................. 226.4 Setpoint Menu ............................................ 246.4.1 “SP” Supply Temperature ........................... 246.4.2 “PO” Pump Operation ................................. 246.4.3 “Pd” Pump Delay ........................................ 246.4.4 “Oar” Outdoor Reset ................................... 246.4.5 “Oal” Minimum Outdoor Reset Point .......... 256.4.6 “rc” Outdoor Reset Ratio ............................ 256.4.7 “oTo” Warm Outdoor Shutdown ................. 256.4.8 “unl” Temperature Units ............................. 256.4.9 “Add” Control Address ................................ 256.4.10 “Dif” Burner On Differential ......................... 256.5 Calculated Control Values .......................... 256.5.1 ACV Release (EBP only) ............................ 256.5.2 Tank Charge Setting (EBP only) ................ 256.5.3 Burner On Point .......................................... 256.5.4 Modulation Point ......................................... 256.6 Other Control Functions ............................. 256.6.1 Using Buttons on Control ........................... 256.6.2 Alarm Acknowledge .................................... 266.6.3 Power On/Off .............................................. 266.6.4 Low Fire Hold ............................................. 266.6.5 High Fire Hold ............................................ 266.6.6 Pump Operation ......................................... 266.6.7 Anti-Condense Valve Operation ................. 266.6.8 Field-Supplied Outdoor Reset Controls ...... 27SECTION 7.Boiler Start Up7.1 Removal of Boiler From Common Vent ...... 277.2 Filling the System ....................................... 287.3 Firing Burner ............................................... 28SECTION 8.Maintenance and Component Description8.1 Unit Pump ................................................... 298.2 Gas Valve ................................................... 298.3 Safety Limit Switch ..................................... 298.4 Boiler Control .............................................. 298.5 Ignition Control ........................................... 308.6 Ignitor / Flame Sensor Assembly ................ 308.7 Transformer ................................................ 308.8 PMW Board ................................................ 308.9 Blower ........................................................ 308.10 Transfer Tank (EBP) .................................. 308.11 Thermostatic Union (EDP/EDN) ................. 318.12 Cleaning the Boiler Coil .............................. 31SECTION 9.Servicing9.1 Sequence of Operation .............................. 319.2.1 Fault Code Identification ............................. 339.2.2 Fault Correction .......................................... 339.2.3 Resolving Lockouts (LO) ............................ 33SECTION 10.Air Orifice and Gas Valve Adjustment................................................................... 35SECTION 11.Symptom Evaluations11.1 Delayed Ignition .......................................... 3511.2 Short Cycling .............................................. 3611.3 Noisy Operation .......................................... 3611.4 Insufficient Hot Water (EBP only) ............... 3611.5 High Gas Consumption .............................. 37SECTION 12.Parts Identification................................................................... 38