6
OPERATION (Continued)
The 101AACBHP Zonex Systems
SYSTEM 2000
Heat Pump controller
has a series of lights which indicate different operations. These are
labeled “Heat,” “Cool,” “Damper,” “Pump,” “Rev. Valve,” “Y1 Cool”, “Y2
Cool,” “Y1 Heat” and “Y2 Heat.” The “Heat” and “Cool” lights
indicate, when illuminated, the present mode of operation. These lights
will momentarily toggle to the other mode every 120 seconds when
polling. Polling is when the controller checks to see how many heat and
cool calls are being made. If there are no calls, the “Heat” or “Cool”
light will be on based on the last operating mode. The “Damper” light
indicates that a thermostat is calling and that power is being supplied to
the damper motors. The “Pump” light indicates that the first stage pump
is operating. The “Rev. Valve” light indicates that the reversing valve is
activated, or when it flashes, that a time delay is active. The “Y1” and
“Y2” Cool and Heat lights are part of the Capacity control function
included on the Heat Pump Controller. The Y2 Heat or Cool LED, when
illuminated, indicates the Y2 compressor has cycled OFF, because the
capacity control setpoint has been exceeded. When Y1 and Y2 heat or
Cool LEDs are both illuminated, the controller will initiate a 4-minute
temperature cut out, with both stages cycling off.
When power is first turned on, if there are no calls for cooling or
heating, the “Heat” light will be the only light illuminated, with the
exception of the “Rev. Valve” light. It will also be on if jumper J1 is
removed (“B” operation). When there is a cooling or heating call, the
“Damper” and “Heat” or “Cool” lights will turn on.
When the “Rev. Valve” light is not indicating a time delay by flashing, it
will stay illuminated only when the reversing valve is operated.
HEAT – Reversing valve “O” Mode
– When the controller receives
an initial or consecutive call for Heat, the Rev Valve LED will flash; the
Heat, Damper and Pump LEDs will illuminate. The first stage heat will
energize on Y1, and the Rev Valve LED will continue to flash for at least
4 minutes. After 4 minutes from Y1, if the supply temperature is 95° or
less, Y2 will energize and the Rev Valve LED will go OFF (Heat “B” mode
will change the flashing Rev Valve LED to ON when Y2 energizes). The
auxiliary heat will energize 4 minutes after Y2 and when the supply air
temperature is 85° or less.
COOL – Reversing Valve “O” Mode
– When the controller receives
an initial or consecutive call for Cool, the Rev Valve LED will flash; the
Cool, Damper and Pump LEDs will illuminate. The first stage cool will
energize on Y1 and O/B with the Rev Valve LED flashing for 8 minutes.
After 8 minutes from Y1, if the supply air temperature is 60° or higher,
Y2 second stage of cooling will energize. The Rev Valve LED will change
from flashing to steady ON. (Cool “B” mode for Rev Valve LED will change
from flashing to OFF after Y2 energizes.)
AUTO CHANGEOVER
– If an existing mode is overridden by an opposite
majority, the existing call will remain in operation for 4 minutes, and
then the controller will go into a 2 minute purge with the existing
dampers staying open. After the purge cycle has timed out, the system
blower cycles OFF (when in the auto mode). The controller goes into a
2 to 4 minute delay, switching to the opposite mode, with the dampers
making the opposite call opening. Y1 and Y2 are not energized during
this delay. After this final delay times out, the controller energizes Y1 in
the opposite mode.
If all zones satisfy, the “Pump” and “Damper” lights will go out. The
“Heat” or “Cool” lights will be on based on the last mode of operation.
If your system includes auxiliary heat, it will be activated by the “W”
terminal on the
SYSTEM 2000’s
Heat Pump Controller. Auxiliary heat
will be activated when the following conditions are met. The “Heat” and
“Damper” lights are on indicating a heat call; the “Pump” light is on
and the “Rev. Valve” light is not flashing, indicating that first and second
stage are activated; four minutes after the “Rev. Valve” light stops
flashing the auxiliary heat will be activated if the leaving air temperature
is below the Electric Heat setpoint (factory set at 85 degrees). The time
delay before bringing on the auxiliary heat gives the second stage time
to raise the leaving air temperature over 85 degrees. Even if the system
is single stage, the controller will still delay the electric heat until after
the second stage time delay is satisfied.
The reversing valve is controlled by the “O/BL” terminal. This terminal
should be connected to the Heat Pumps terminal strip according to the
unit manufacturers recommendations. Jumper J1 on the
SYSTEM 2000
Heat Pump board needs to be adjusted to operate with the different
manufacturers designs. The Heat Pump board is shipped from our
factory ready to operate a heat pump unit which requires the “O” wire
to energize the reversing valve in cooling. If the reversing valve needs to
be activated for the “BL” terminal, jumper J1 needs to be removed from
the Controller board. Refer to the Heat Pump Controller drawing on the
previous page for the location of jumper “J1”. Remove the jumper from
the board to activate the reversing valve using the “BL” terminal.
Warning:
For heat pumps using standard gas/electric thermostats, do not use the 101AACBHP System Controller. Instead, use the
101ASSB System Controller and the CAPL-2 Capacity Controller.
SYSTEM 2000 CONTROLLERS – HEAT PUMP 101AACBHP
