LAARS Heating Systems
i
Table of Contents
SECTION 1 General Information ........................ 1
1.A Introduction........................................... 1
1.B
Model Identification
............................. 1
1.C Warranty ............................................... 1
1.D
Safety Notes ......................................... 2
1.E
Unit Overview ....................................... 4
1.F
Gas Train Components ........................ 5
1.G
Venting Dimensions & Sizing ............... 6
1.H Dimensions........................................... 6
1.I Unpacking ............................................ 8
1.J
Locating the unit ................................... 8
1.K Clearances ........................................... 9
SECTION 2 Venting and Combustion Air ......... 10
2.A
General Venting Information............... 10
2.B
Vent and Air Pipe Material .................. 10
2.B.1
Venting Reqs Unique to Canada ........ 10
2.B.1.a Flue Gas Sampling Port - ................... 10
2.B.1.b Exhaust Vent Terminal - ..................... 11
2.C
Vent and Air Pipe Sizing ..................... 12
2.C.1
Category lV Vent Sizes....................... 13
2.C.2
Category II Vent Sizes ........................ 13
2.C.3
Common Venting ................................ 13
2.C.4
Common Vent Test ............................. 14
2.C.5
Combustion Air ................................... 15
2.C.5.a Combustion Air From Room ............... 15
2.C.5.b Ducted Combustion Air....................... 16
2.D
Locating the Vent
and Combustion Air Terminals ............ 16
2.D.1
Side-wall Vent Terminal ...................... 16
2.D.2
Side-wall Combustion Air Terminal ..... 18
2.D.3
Vertical Vent Terminal ......................... 18
2.D.4
Vertical Combustion Air Terminal ........ 18
2.E
Outdoor Installation ............................ 19
2.F
Installations in the
Commonwealth of Massachusetts ..... 19
SECTION 3 Gas supply and Piping.................. 20
3.A
Gas Supply and Piping ....................... 20
3.B
Gas Pipe Sizing .................................. 21
SECTION 4 Water Flow and Headloss Data .... 22
4.A
General Water Flow Information ........ 22
4.B
Boiler Water Flow & Headloss Data ... 22
4.C
Water Heater Water Flow
and Headloss Data ............................. 23
SECTION 5 Piping............................................ 24
5.A
Boiler Water Piping ............................. 24
5.A.1
Boiler Water Connections ................... 24
5.A.2
Cold Water Make-Up .......................... 24
5.A.3
Freeze Protection ............................... 24
5.A.4
Suggested Boiler Piping Schematics . 25
5.B
Water Heaters .................................... 29
5.B.1
Water Quality ...................................... 29
5.B.2
Heater Water Connections ................. 29
5.B.3
Cold Water Make-Up .......................... 29
5.B.4
Freeze Protection ............................... 30
5.B.5
Suggested Piping Schematics............ 30
SECTION 6 Condensate Drain Trap ................ 32
SECTION 7 Electrical Connections .................. 33
7.A
Installation Warnings .......................... 33
7.B
Main Power Connections ................... 34
7.C
Control Panel Layout .......................... 35
7.D
Field Connections............................... 35
7.D.1 Power ................................................. 35
7.D.2
Dry Contacts ....................................... 35
7.D.3
Temperature Sensors ......................... 36
7.D.4
Heat Demands ................................... 36
7.D.5
Analog In and Analog Out .................. 37
7.D.6
Dry Contacts. Run & Alarm ................ 37
7.D.7
RS 485, Cascade ............................... 38
7.D.8
RS485 BMS........................................ 38
7.E
Modbus to BACnet Memory Map ....... 39
7.F
Wiring Diagrams ................................. 42
7.G
High Voltage Wiring Diagrams ........... 46
7.H
Ladder Diagrams ................................ 53
SECTION 8 Control Operation ......................... 60
8.A
The Home Screen .............................. 60
8.A.1
Home Screen Active Icons ................. 60
8.A.2
Keypad Operations............................. 61
8.B
Login to Lock / Unlock the Display ..... 62
8.C
Quick Start ........................................ 63
8.C.1 CH
..................................................... 63
8.C.2.a CH1 .................................................... 64
8.C.2.b CH2 .................................................... 64
8.C.2 DHW/DHW3
...................................... 64
8.C.3
Outdoor Reset ................................... 65
8.C.4
Warm Weather Shut Down ............... 65
8.C.5
Anti-Short Cycle ................................ 66
8.C.6
Time & Date ...................................... 66
