LAARS Heating Systems
Section 9 –
SETUP AND CONFIGURATION ............................ 44
9.1 ReviewofLead/LagControlSystem ...... 44
9.1.1 AboutLead/LagOperation ..................... 44
9.1.2 Lead/LagModulationCycle .................... 45
9.1.3 NTHLead/LagwithIndirect
DomesticHotWater ................................ 46
9.2 ConnectionTerminals ............................. 46
9.3 NeoThermLCSystemCongurations .. 46-54
9.4 Installation Jobs ...................................... 55
A NoteforSystemsUsingCommon
Venting .................................................... 55
B NamingtheControllers ........................... 55
C MakeOneControltheLead/Lag
Master ..................................................... 56
D DisabletheLead/LagMasterFunction
ontheLead/LagSlaves .......................... 57
E Set up the Modbus Control Addressing .. 58
F Set the Flap Valve IDs ............................ 59
G Disconnect Unused Operator
Interfaces ................................................ 63
H Connect the Modbus Wiring ................... 63
I SettheParametersUsedbythe
Lead/LagSystem .................................... 64
Aboutthe“TimeofDay”Function ........... 68
J InstalltheSystemSensorandAdjust
the Setpoint ............................................ 68
K SettheLead/LagOutdoorResetand
WarmWeatherShutdown ....................... 68
About“OutdoorReset” ........................... 69
L BuildingAutomationorMultipleBoiler
ControlThermostatDemand ................. 70
M BuildingAutomationorMultipleBoiler
4-20mASetpointControl ....................... 70
N BuildingAutomationorMultipleBoiler
4-20mAModulationControl .................... 71
O CombustionSetupProcedure ................ 71
P SettingtheDateandTimeonthe
SystemDisplay ....................................... 76
9.5 SetupforDomesticHotWaterona
Lead/LagSystem .................................... 77
Setup Type 1 ........................................... 77
Setup Type 2 ........................................... 78
Setup Type 3 ........................................... 79
9.6 Gateway Connections to a
BuildingAutomationSystem ................... 80
9.7 Setup for High Altitude Operation -
NT 1700 Only .......................................... 80
9.8 InstallerParameters .......................... 81-87
Section 10 -
INITIAL STARTUP INSTRUCTIONS ...................... 88
10.1 FillingtheBoilerSystem ......................... 88
10.2 Initial Operation ...................................... 89
10.2.1 Initial Burner Operation ........................... 89
10.2.2 CombustionSetupProcedure ................ 89
10.3 ShuttingDowntheNeoThermLC ........... 89
10.4 RestartingtheNeoThermLC .................. 89
Section 11
MAINTENANCE ..................................................... 90
11.1 SystemMaintenance .............................. 90
11.2 Maintenance Notes ................................. 90
11.2.1 Burner ..................................................... 90
11.2.2 ModulatingGasValve/Venturi ................ 90
11.2.3 Controllers .............................................. 91
11.2.4 IgnitorAssembly ..................................... 91
11.2.5 FlameSensor ......................................... 91
11.2.6 TransformerwithIntegral
Circuit Breaker ........................................ 91
11.2.7 Blower ..................................................... 92
11.2.8 Heat Exchanger Coils ............................. 92
11.2.9 Gas Pressure Switches (optional) .......... 92
11.2.10Natural/PropaneGasConversion ......... 93
11.2.11 Condensate Trap .................................. 93
11.2.12 Battery(Date&TimeBack-Up) ............ 93
Section 12
TROUBLESHOOTING ........................................... 94
12.1 Potential Setup and Synchronization
Problems ................................................ 94
12.1.1 Controller Synchronization ..................... 94
12.1.2 Flap Valve Status Checks ....................... 95
12.2 About Lockouts, Holds, and Alerts .......... 95
12.2.1 Responding to a Lockout, Hold,
or Alert .................................................... 95
12.2.2 Viewing the Lockout and Alert
Histories .................................................. 96
12.3 Troubleshooting Tables (all codes)......98-112
12.4 DiagnosticTestsandInput/Output
Indicators ...............................................113
12.5 Lead/LagSlaveDiagnostics ..................114
12.6 Statistics ................................................114
12.7 Analysis .................................................114
12.8 Control Snapshot ...................................115
12.9 Operating Sequence .............................. 115
Section 13
REPLACEMENT PARTS .......................................118
13.1 GeneralInformation ...............................118
13.2 Parts List ................................................118
13.3 Parts Illustrations .................................. 124
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