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Eubank 7AA1024H-1060H & 7AA2024H-2060H I&O Manual 03/2021 Rev.1
Functions
Lockout Protection
If either of the fault conditions (LPS or HPS) occurs twice within one hour, the control board will enter
into and indicate the lockout mode. In the lockout mode, the compressor is turned off. If there is a call
for indoor air flow “G”, the blower remains energized, the alarm output is energized and the red LED
will blink to indicate which fault has occurred. When the lockout condition is cleared, the unit will reset
if the thermostat is turned “Off” and back to “On” or when the power to the heat pump is reset. With the
control board, the user can select either normally closed or normally open remote alarm dry contacts by
moving a wire on the control board. The heat pump is factory wired to be normally open.
Delay on Break
The board has an integral three minute delay on break (anti-short cycle) timer. This timer initiates every
time the compressor turns off to prevent a short cycle condition.
Loss of Charge (LPS) By-Pass Timer
The control includes a fixed, three minute Loss of Charge Switch (LPS) bypass timer. If the Loss of Charge
Switch is open on initial power up or while the compressor is running, the control will ignore the fault
for three minutes. If the fault still exists after three minutes, the control will de-energize the compressor,
register a loss of charge fault, and initiate the three minute anti-short cycle timer.
User Selectable Settings
The control board has three potentiometers (pots) that allow the user to select settings to optimize the
installation. See
Figure 1
for location of the pots.
Delay on Make
The control has a pot settable 0.03 to10 minute delay on make timer that initiates upon initial power up
only. The factory set time is three minutes.
Post Purge Potentiometer
The board includes a pot settable 10-90 second post purge timer. When the signal at the “G” terminal is
removed, the indoor blower will remain energized for the amount of time selected by the pot. The pot
is factory set at ninety seconds.
Indoor Blower Motor Speed Control Potentiometer
The control has a speed control potentiometer for the indoor fan blower. The user can vary the speed of
the fan using this potentiometer from approximately 40% to 100% of rated air flow. Caution should be
used when slowing the speed of the indoor blower; sufficient air flow is critical to the proper operation of
the heat pump. Note: the indoor blower motor speed control is not functional on units with electronically
commutated (EC) motors.
The control board has four operational modes that can be defined by the installer. These modes are
selected with jumpers. See
Figure 1
for location of the jumpers. To change the factory setting,
gently
pull the jumper and slide it onto the desired setting.
Damper Relay (Damper Relay Open-DRO /Damper Relay Closed-DRC)
The board has a two position, motorized fresh air damper (ventilation option “B”) from the “G” input
when this option is selected. It is pin selectable using a jumper to select “Yes” to enable it. When “Yes”
is selected, the control will energize the Damper Relay Open terminal when “G” is calling for the damper
