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Element
Section 8: Water Heater and AquaSolve Startup:
L-OMM-0003_A
• 10/8/2021 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page
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of
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IMPORTANT:
If the supply gas pressure is outside of the allowable range, notify the building maintenance
personnel or installer to reduce the gas pressure to the water heaters.
7. Open manual shutoff valve at inlet of gas train. Check the train for leaks using a soap
solution. If any bubbles are detected close manual gas valve, tighten the leaking
connection, then open the manual gas shutoff valve again and check for leaks.
8. Open
the 1/8” pilot shut-off test valve connected to the manual shutoff gas valve
downstream of the gas train closest to the burner. Note gas pressure measured by the
monometer. Check gas pressure again after about 15 minutes. A gas pressure increase of
0.5” W.C. or more indicates one of the gas solenoid valves is leaking. Isolate and replace
the leaking gas valve. After any leaking valve is replaced, the reassembled gas train must
be leak tested again before start-up is attempted.
NOTE: Some flame controls read the flame signal in micro amps, some in volts DC.
8.6 Startup Procedure
1. Turn the water heater power switch to the OFF position.
2. Drill a small test hole in the flue vent approximately two feet from the vent connection and insert
the combustion analyzer probe into the vent test hole.
3. Simulate a Safety Shutoff Ignition Fail Test of the EOS control system on each Element:
a) With the manual gas valve at the burner closed, turn on the electrical service to the water
heater, then turn the Element power switch to the ON position.
b) The EOS Temperature control touch screen will energize. If the tank temperature is 5° or
more below the factory setpoint of 120° the Call-For-Heat sequence will initiate.
c) With no gas pressure, the ignition control will attempt to ignite the burner three times before
proceeding to a safety shutoff. Following the third failed attempt, the display screen
immediately shows a
LOCKOUT
condition has occurred.
d) In a few seconds an
ERROR
code flashes in the Status field, and a
FLAME FAIL
alarm
message is displayed followed by
“IGNITION TRIAL FAIL”
across the top of the screen.
e)
IMPORTANT:
Open one or more nearby hot water faucets before restarting the Element to
allow heat to dissipate.
4. When the call for heat sequence begins, the burner blower is energized.
a) When the BLOWER operation is verified by the tachometer, the
Ignition Pre-Purge
sequence and
Hot Surface Igniter Heat up Period
begins. The
BLOWER
message is
displayed during this pre-purge period.
b) Following a pre-purge and Hot Surface Igniter Heat Up countdown of about 36 seconds, a
4-second trial for Ignition period is initiated. During this sequence the screen displays
IGNITION
while the gas valves are being energized.
c) When ignition occurs, and flame is proven, the Status field shows the
BURNER
is firing and
the flame
CURRENT
is displayed in micro amps for about 8 seconds.
d) As the burner fires, the modulating firing rate percentage displayed at the bottom of the
screen will increase and then decrease as the Element reaches its setpoint temperature of
120 degrees. Disregard this display for inputs with On-Off burner control systems.
e) The
CONTROL TEMPERATURE
will continue to display throughout the burner run cycle
and after shutdown until the Element returns to a satisfied and idle state.