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Installation
Option setting details
NOTE
•
After changing DIP SW setting, reset power supply or press the K1 (Reset) button, to update the changes.
Options
1) Auxiliary heater installed
for heat pump
SW1-2
2) Heat sources option (W2)
SW1-3
3) 3 step fan speed control for
1 stage thermostats
(Y connection only)
SW2-9 and 2-10
28 English
•
For heat pump applications, if an auxiliary heater is installed, set SW1-2 to On.
If SW1-2 is set to Off, the W1 and W2 input/output terminals on the AHU Control Unit
(ACU) are disabled.
CAUTION
•
If SW1-2 is not set to On and the W1 and W2 signals of the thermostat are
received at the AHU Control Unit (ACU), the heat pump will turn off and the
•
If SW1-1 is set to "Furnace with A-coil (dual fuel or cooling only)", set SW1-2 to Off and
connect the furnace output signal of the thermostat to W1 of the AHU Control Unit
(ACU).
CAUTION
•
If SW1-2 is set to Off and a signal is input to W1 of the AHU Control Unit (ACU), the
heat pump stops operation.
•
If the thermostat outputs stage 2 auxiliary heater signals, set SW1-3 to On. If the
thermostat outputs an "Emergency heat" signal, set SW1-3 to Off.
CAUTION
•
If SW1-1 is set to Heat-pump and SW1-2 is set to Off, there is no W2 signal input or
output in the AHU Control Unit (ACU).
•
This can only be turned on when a 1-stage thermostat is used.
•
The fan speed control logic is as follows:
–
High: Used during the initial stage of cooling/heating operation
–
Mid: When the following cycle occurs 2 times sequentially:
Used when High speed is enabled and the thermostat turns off within 30 minutes
after turning on within 20 minutes after turning off.
–
Low: When the following cycle occurs 2 times sequentially:
Used when Mid speed is enabled and the thermostat turns off within 30 minutes
after turning on within 20 minutes after turning off.
–
If cooling/heating operation if Mid/Low speed continues for more than
•
G1 (Low) / G2 (Mid) / G3 (High) signals will also be enabled simultaneously.
Option setting details
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