Page 2
LAARS Heating Systems
TABLE OF CONTENTS
SECTION 1.
General Information
1.1
Introduction ................................................... 3
1.2
Codes and Standards ................................... 3
1.3
Unpacking the Appliance .............................. 4
1.4
Locating the Appliance ................................. 4
1.5
Clearances ................................................... 4
SECTION 2.
Venting Options
2.1
Concentric Direct Vent ................................. 5
2.1.1
Concentric Vent Description ......................... 5
2.1.2
Laars Concentric Vent Kits ........................... 5
2.1.3
Horizontal Concentric Vent Location ............ 5
2.2
Stainless Steel Single Pipe Horizontal
and Vertical Vents — Category IV ................ 9
2.3
Air Source For Combustion (when not
ducted to the Endurance) ........................... 11
2.3.1
Air From Inside the Building ....................... 11
2.3.2
All Air From Outdoors ................................. 11
2.3.3
Connecting Special Gas Vent to the
Appliance .................................................... 12
2.4
Non-Concentric Combustion Air ................. 12
SECTION 3.
Gas Piping
3.1
Gas Piping .................................................. 12
3.2
Domestic Water Piping (EBP only) ............. 13
3.3
Anti-Freeze — Domestic Water .................. 14
SECTION 4.
Hydronic Heat Piping
4.1
Hydronic Piping .......................................... 14
4.2
Using in a Combined Hot Water Heating
and Chilled Water Cooling System ............. 17
4.3
Water Quality and Treatment ..................... 17
4.4
Anti-Freeze ................................................. 17
4.4.1
Endurance Boiler Low
Temperature Feature ................................. 17
4.4.2
Anti-Freeze Boiler Additives ....................... 17
SECTION 5.
Electrical Connections
5.1
Electrical Connections ................................ 20
SECTION 6.
Using the Boiler Control
6.1
Front Panel Display .................................... 22
6.2
Control Logic .............................................. 22
6.3
View Menu .................................................. 22
6.4
Setpoint Menu ............................................ 24
6.4.1
“SP” Supply Temperature ........................... 24
6.4.2
“PO” Pump Operation ................................. 24
6.4.3
“Pd” Pump Delay ........................................ 24
6.4.4
“Oar” Outdoor Reset ................................... 24
6.4.5
“Oal” Minimum Outdoor Reset Point .......... 25
6.4.6
“rc” Outdoor Reset Ratio ............................ 25
6.4.7
“oTo” Warm Outdoor Shutdown ................. 25
6.4.8
“unl” Temperature Units ............................. 25
6.4.9
“Add” Control Address ................................ 25
6.4.10 “Dif” Burner On Differential ......................... 25
6.5
Calculated Control Values .......................... 25
6.5.1
ACV Release (EBP only) ............................ 25
6.5.2
Tank Charge Setting (EBP only) ................ 25
6.5.3
Burner On Point .......................................... 25
6.5.4
Modulation Point ......................................... 25
6.6
Other Control Functions ............................. 25
6.6.1
Using Buttons on Control ........................... 25
6.6.2
Alarm Acknowledge .................................... 26
6.6.3
Power On/Off .............................................. 26
6.6.4
Low Fire Hold ............................................. 26
6.6.5
High Fire Hold ............................................ 26
6.6.6
Pump Operation ......................................... 26
6.6.7
Anti-Condense Valve Operation ................. 26
6.6.8
Field-Supplied Outdoor Reset Controls ...... 27
SECTION 7.
Boiler Start Up
7.1
Removal of Boiler From Common Vent ...... 27
7.2
Filling the System ....................................... 28
7.3
Firing Burner ............................................... 28
SECTION 8.
Maintenance and Component Description
8.1
Unit Pump ................................................... 29
8.2
Gas Valve ................................................... 29
8.3
Safety Limit Switch ..................................... 29
8.4
Boiler Control .............................................. 29
8.5
Ignition Control ........................................... 30
8.6
Ignitor / Flame Sensor Assembly ................ 30
8.7
Transformer ................................................ 30
8.8
PMW Board ................................................ 30
8.9
Blower ........................................................ 30
8.10
Transfer Tank (EBP) .................................. 30
8.11
Thermostatic Union (EDP/EDN) ................. 31
8.12
Cleaning the Boiler Coil .............................. 31
SECTION 9.
Servicing
9.1
Sequence of Operation .............................. 31
9.2.1
Fault Code Identification ............................. 33
9.2.2
Fault Correction .......................................... 33
9.2.3
Resolving Lockouts (LO) ............................ 33
SECTION 10.
Air Orifice and Gas Valve Adjustment
................................................................... 35
SECTION 11.
Symptom Evaluations
11.1
Delayed Ignition .......................................... 35
11.2
Short Cycling .............................................. 36
11.3
Noisy Operation .......................................... 36
11.4
Insufficient Hot Water (EBP only) ............... 36
11.5
High Gas Consumption .............................. 37
SECTION 12.
Parts Identification
................................................................... 38
