9
SYSTEM CONTROLLER OPERATIONS – DIGI3U
Jumper
Y
W-O/B
W2
G
PWR
DPR
MODE
FUNCTION
OFF
OFF
OFF
OFF
OFF
OFF
OFF
Power off
OFF
OFF
OFF
OFF
ON
OFF
ON
Power on, blower off, all zones satisfied
OFF
OFF
OFF
ON
ON
0
Vent
Blower on, compressor off, all zones satisfied
OFF
OFF
OFF
ON
ON
1
Purge
Blower on, compressor off. DPR w/LED on are closed
O
ON
ON
OFF
ON
ON
1
Cooling
Cool stage, compressor on. DPR w/LED on are closed
B
ON
OFF
OFF
ON
ON
1
Cooling
Cool stage, compressor on. DPR w/LED on are closed
O
ON
OFF
OFF
ON
ON
1
Heating
Heat, 1st stage, compressor on. DPR w/LED on are closed
B
ON
ON
OFF
ON
ON
1
Heating
Heat, 1st stage, compressor on. DPR w/LED on are closed
O
ON
OFF
ON
ON
ON
1
Heating
Heat, 2nd stage, compressor on. DPR w/LED on are closed
B
ON
ON
ON
ON
ON
1
Heating
Heat, 2nd stage, compressor on. DPR w/LED on are closed
O
OFF
ON
ON
ON
ON
1
Heating*
Em Heat, compressor off. DPR w/LED on are closed
B
OFF
OFF
ON
ON
ON
1
Heating*
Em Heat, compressor off. DPR w/LED on are closed
O
OFF
ON
OFF
ON
FL
1
LAT**
System in Low Temp cutout condition (Cooling)
B
OFF
OFF
OFF
ON
FL
1
LAT**
System in Low Temp cutout condition (Cooling)
O
OFF
OFF
OFF
ON
FL
1
LAT**
System in High Temp cutout condition (Heating)
B
OFF
ON
OFF
ON
FL
1
LAT**
System in High Temp cutout condition (Heating)
A =
On when reversing valve jumper is in O position.
B =
ON when reversing valve jumper is in B position
C =
On when emergency heat is on.
1 =
One or more damper LEDs on
0 =
All damper LEDs off
*2 – Stage Gas/Electric Thermostat is required.
**LAT Capacity Control. The factory optional thermistor is in place to function in this mode.
STATUS LED LEGEND
W-O/B
Reversing valve LED, yellow. On when the reversing valve is energized.
Y1
Compressor LED, yellow. On when the first compressor stage is energized.
G
Indoor blower LED, green. On when the indoor blower is energized by the DTHP4A Controller.
W2
Auxiliary heat LED, red. On when the auxiliary heat is energized.
PWR
Power LED, orange. On when DTHP4A is powered. Flashing during capacity control cutout.
DPR
Damper status LED, red. One per damper. On when damper is closed.
Emergency Heat Operation:
To put the Heat Pump system into
Emergency Heat, the mode selector switch on the Heat Pump thermostat
(STAT 1), must be placed in the Emergency Heat position and must then
make a call for heat in that mode. This “latches” the controller in the
Emergency Heat mode. After STAT 1 makes a call and then satisfies, any
consecutive heat calls from STAT 2 and STAT 3 will bring on Emergency
Heat independently. The supply dampers will actuate independently
according to the individual zone demand.
To “unlatch” the controller from Emergency Heat, the Heat Pump thermostat
(STAT 1) mode switch must be placed in the normal Heat mode, and
make a heat call on Y (“O” mode) or Y and O (“B” mode). After the
Heat Pump thermostat makes a standard heat call, the Emergency Heat
will be “unlatched” and all consecutive heat calls from any thermostat
will bring on the compressor.
Purge Mode:
When all calls are satisfied or a changeover occurs, a
3-minute recycle delay will be initiated. During this time, the controller
will not process any calls for heat or cool; and the compressor or gas
valve will shut down and blower will continue to run. All dampers go
open during this time
Changeover Heat Pump:
While controller is operating in heat or cool,
if another thermostat places a call for the opposite mode, a changeover
sequence will begin. The controller will continue running in its current
mode for 15 minutes or until current call is satisfied, whichever occurs first.
After 15 minutes, or the call is satisfied, a 3-minute purge will start. At
the end of the 3-minute time delay, the opposite call will begin. If there
is still an opposing call, changeover sequence will initiate and repeat
changeover cycle until opposing calls are satisfied.
When all calls are satisfied, LEDs will go off and a 3-minute time delay
will be initiated. During this time, controller will not allow any calls for
heat or cool.
STATUS LEDS/ HEAT PUMP MODE
