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Operating Instructions
Adjusting The Temperature On The ABH Display
1. STOP! Make sure you have read the safety information above.
2. Turn off all electric power to the appliance.
3. This appliance is equipped with an ignition device which automatically lights the burner. Do not try to light the
burner by hand.
4. Turn gas shutoff valve clockwise to “off” The handle will be horizontal; do not force it.
5. Wait five (5) minutes to clear out any gas. If you then smell gas, STOP! Follow the instructions from Section B:
Lighting Instructions in the safety information. If you don’t smell gas, go to the next step.
6. Turn the gas shutoff valve counter clockwise to “on” The handle will be vertical.
7. Turn on all electric power to appliance.
8. Set the thermostat to the desired setting.
9. If the appliance will not operate, follow the instructions “To Turn Off Gas To Appliance” (Servicing, page 47 and call
your service technician or gas supplier.
Enter the menu labeled Setpoint in the upper right of the display to set the desired operating water temperature. On a boiler, this will
be based on the leaving water temperature. On a water heater it will be based either on a connected external (storage tank) sensor,
or, if there is none connected, it will operate based on the incoming water temperature. The range is factory-set at 50–160°F for
water heaters and 50–195°F for boilers. Other special ranges are available by contacting the factory.
If other temperature settings
are required, contact Armstrong Hot Water, Inc.
Other special parameters may be set by entering a password in the display, varying
from end user, installer, advanced, and factory levels. The display can show either °F or °C set in the setup menu, then display
options.
Sequence Of Operation
1. When power is first applied to the control, the control display will read the temperature Setpoint. The control will initially run
through a self-diagnostic routine and then go into its operating mode. If there is no call for heat, the system will go into an idle
state.
2. If the thermostat is calling for heat, the control module will determine if the water temperature is below the programmed set
point value minus the switching differential. It will then initiate a heating cycle.
3. The control then performs selected system diagnostic checks. If all checks are successfully passed, a pre-purge cycle is
initiated (the blower will be on at 80%).
4. When the pre-purge period is complete, power is applied to the spark ignitor for 4.5 seconds. Approximately 1/2 second later,
flame is verified. If a flame is not verified during the trial-for-ignition, the gas valve is immediately closed and the control will
return to Step 3. After four trials, if a flame is not verified, the control will go into a lockout mode. If a flame is confirmed, the
control enters the heating mode. The firing rate will be based on the control’s proprietary algorithm.
5. When water temperature reaches the temperature set point value, the burner will be at minimum firing rate.If,when firing at
minimum rate, it reaches temperature setpoint plus offset, the gas valve closes and the control enters a post-purge state (the
blower will be on at 80%). At any time if an external thermostat is being used and becomes satisfied, the gas valve will be
closed immediately.
Start-Up Procedures - continued
BURN HAZARD! Water temperature over 125ºF (51.6ºC )can cause severe burns instantly, or
death from scalds. Children, the disabled, and the elderly are at highest risk of being scalded.
See instruction manual before setting temperature at water heater. Feel water before bathing or
showering! Temperature limiting valves are available.
