Status Display Screens - Lochinvar Shield SNR150-100 Installation & Service Manual

10
Operating information

Status display screens

By using the Previous/Next (, ) arrow keys on the electronic control module display panel, you can navigate through the
five (5) display screens. Each screen will contain two (2) viewable items. The following is a description of the individual items
and what they can display:
Screen
#1
Press the Next  arrow key on the electronic control module display to access Screen #2.
#2
Press the Next  arrow key on the electronic control module display to access Screen #3.
Status Display Screens
Display shows:
The unit has been turned OFF by the Enter/Reset button on the
HTR: OFF
electronic control module display panel.
Standby The unit has not received a call for heat.
Prepurge The unit has initiated a prepurge period on a call for heat.
Ignition The unit has begun a spark period to ignite the main burner.
RUN***% Rate The unit has fired and is running at the displayed percentage.
The call for heat has been satisfied and the unit runs the fan for an
Postpurge additional postpurge period to clear the combustion chamber and vent
system of residual flue products.
The unit has been placed in a temporary mode that will allow the unit to
Service
fire at 100% of rate for the purpose of combustion analysis.
TANK:***.*F The tank temperature is displayed.
Open The control does not detect the tank sensor.
Shorted The tank sensor wires or the sensor itself has become shorted.
HEX IN: ***.*F The temperature at the inlet to the heat exchanger is displayed.
Open The control does not detect the heat exchanger inlet sensor.
The heat exchanger inlet sensor wires or the sensor itself has become
Shorted
shorted.
HEX OUT: ***.*F The temperature at the outlet of the heat exchanger is displayed.
Open The control does not detect the heat exchanger outlet sensor.
The heat exchanger outlet sensor wires or the sensor itself has become
Shorted
shorted.
TM
(continued)
Description
Installation & Service Manual
55