NTI Trinity Lx600 Guide

#84034 Trinity Lx Commercial Controller Issue date: 2012-Jan-11
Replacement Instructions Revision date: 2012-Jan-11
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#84034 - Trinity Lx Commercial Controller Replacement Instructions
The commercial controller (part number 84034) is configured specifically for use with Trinity Lx
Commercial series boilers only, Lx500-800 inclusive. This controller shall NOT be used with
non Lx Commercial-series boilers. Use of this controller on boiler models other than Trinity Lx Commercial-series will
override some saftey features and may lead to unsafe operation resulting in fire, explosion, property damage or death.
Check the contents of the parts received to ensure the controller is labeled “84034 Sola,Lx
Comm. Cfg.”, signifying that it is for use with Lx Commercial-series Trinity boilers; see
illustration below. If the controller is not labeled, or has a different label, it is not intended for use with a Trinity Lx
Commercial-series boiler. Note: all commercial Sola controllers have a blue case, if the controller case is not blue return
to NTI.
Controller Replacement Instructions
The instuctions provided in this document are a supplement to the Installation and Operating
Instructions originally provided with the boiler. Failure to follow the Installation and Operating
Instructions may result in fire, explosion, property damage or loss of life.
These instructions describe the steps necessary to replace a controller from any model of the Trinity Lx Commercial
series, sizes 500 to 800 inclusive, with a “generic” controller. Be sure to thoroughly read and understand these
instructions before attempting a controller replacement.
Note: Before replacing an existing controller, record (if possible) the settings specific to the particular installation from
the old controller, so they may be transferred to the new replacement controller.
Replace the Trinity Lx Commercial controller:
1) Turn off power to the appliance via the circuit breaker, remote switch or local On/Off switch.
2) For Lx500-600 units remove the top panel. For Lx700-800 units, remove the top rear panel.
3) Remove the control panel cover.
4) Unplug all electrical connections from the controller. All wiring is connected to the controller by means of quick-
connect plugs, each of which is uniquely keyed to its mating receptacle to prevent incorrect electrical connections.
5) Remove the old controller from the panel. The controller is secured to the panel by four screws, #8 w/ ¼” hex drive.
6) Installation procedure is in reverse order.
7) Use the display to adjust the control parameter settings to the values specific to the boiler model (see instructions
below).
Contact NTI if the replacement
controller does not have this
exact decal on the Controller.

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Control Settings Verification and Adjustments:
1) Control Configuration Verification –From the “Configuration” menu, select “System Identification and Access”.
Check to ensure the control is equipped with the correct configuration –see illustration below. Replacement
controllers intended for use on Lx Commercial-series boilers will begin with “NTI LxCGen”. At this time the
installer may choose to modify the “Boiler name” to reflect the boiler model the control is installed on, i.e. Lx500.
2) Modulation Rate Adjustments –Since the replacement control is generic to all Lx Commercial boiler models, the
minimum and maximum modulation rates must be set to the applicable values. Select “Modulation Configuration”
from the “Configuration” menu and adjust the settings according to the following table:
Parameter
Description
Settings
CH max. modulation
rate
Maximum permissible blower speed during CH demand. Setting
is model dependent.
Lx500 = 6400 rpm
Lx600 = 4350 rpm
Lx700 = 4300 rpm
Lx800 = 5300 rpm
DHW max.
modulation rate
Maximum permissible blower speed during DHW demand.
Setting is model dependent.
Minimum modulation
rate
Minimum permissible blower speed. Setting is model dependent.
Lx500 = 1400 rpm
Lx600 = 1050 rpm
Lx700 = 1250 rpm
Lx800 = 1250 rpm
Failure to set the modulation rates appropriate to your specific boiler model according the
table above may result in fire, explosion, property damage or loss of life.
Configuration Identification
Must begin with “NTI LxCGen”

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3) Pulses Per Revolution Adjustment –Since the replacement control is generic to all Lx Commercial boiler models,
the blower tachometer feedback “Pulses per revolution” setting must be set to the appropriate value for the specific
boiler. Select “Fan Configuration” from the “Configuration” menu and adjust the settings according to the following
table (see the illustration below):
Parameter
Description
Settings
Pulses per revolution
Number of feedback pulses produced for each revolution of the
combustion blower impeller.
Lx500 = 2
Lx600 = 3
Lx700 = 3
Lx800 = 3