Element
SECTION 10: The Electronic Operating System (EOS)
L-OMM-0003_A
• 10/8/2021 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page
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11.5.1 Touch Screen User Interface
The EOS touchscreen provides one-touch access to view and adjust various Menu setpoints.
The touchscreen displays Status Fields, Items, Water Heater Output and Number Fields. It also
contains buttons for navigation & adjustment, and the Home Button to access menu selections.
11.5.2 Status Field Display
The Status Field displays the current operating status of the control display. Most items in the
status field are only visible when in the View Menu or an alarm condition is present.
Item
Description
SANI
Sanitation Mode: Momentarily energizes a field installed sanitation pump and operates
the water heater at an elevated setpoint temperature.
HAND
Hand Mode: allows user to manually control the operation and firing rate of the burner.
OFF
System has been disabled in the Manual Override Menu.
PURG
Purge: Individual pumps have been activated in the Manual Override Menu.
IDLE
EOS is Idle due to no demand for heat.
ARSW
EOS is attempting to purge but waiting for air proving switch to prove blower air flow.
PREP
EOS is Pre-Purging the burner system.
IGN
Hot Surface Igniter is hot and gas valve has opened to attempt ignition (4 seconds).
BURN
Burner has ignited and flame has been sensed.
POST
The Call for Heat has ended and the EOS is Post-Purging the burner system.
11.5.3 Operational Sequence Field Display
The EOS displays the following burner operational sequence, ignition status, timings,
temperatures and values:
Item
Value
Displayed
Description
SATISFIED
⁰
F
No Call For Heat based on temperature at the top of the tank
CALL FOR
HEAT
Initiated when the temperature sensed at the control sensor at the top of the
tank is 5 degrees less than the setpoint temperature.
BLOWER
mm:ss
Displays the pre-purge time countdown until the igniter heat up begins
IGNITION
mm:ss
Displays heat up time until gas valve opens
CURRENT
0 - 10.0 µA
Flame Current (µA)
CTRL TEMP
⁰
F
Flame is established and the temperature sensed at the control sensor at
the top of the tank is displayed.
BLOWER
mm:ss
When call for heat has ended the post purge time countdown is displayed.
