Daikin One+ Reference Manual page 19

Follow the steps below to measure and achieve 0.6 VDC bias
–
value.
– Turn OFF the thermostat and make sure the system is idle
– Take Bias readings on the outdoor Heat Pump or Air Conditioner
– Measure DC voltage between 24 VAC common to Data 1 = D1 VDC
– Measure DC voltage between 24 VAC common and Data 2 = D2 VDC
– Bias reading = D1 VDC – D2 VDC
= 0.61 VDC
– Measure DC voltage between Data 1 and Data 2. This value should
equal the value calculated in the previous step.
– Take Bias readings on indoor Air Handler or Furnace by repeating
above steps on its terminal blocks.
– Take Bias readings on CAPE EEV coil if connected by repeating
above steps on its terminal blocks.
– The Bias readings should match on all the equipment's terminal
blocks.
– If Bias reading is below 0.6 VDC, check the TERM Dip-Switch (DS1)
setting on the outdoor unit. Move the TERM Dip-Switch (DS1) to
OFF position. This should improve the Bias reading to 0.6 VDC.
– After stabilizing the network, power down the entire HVAC
system. Wait for a few minutes and power back up. It will take
approximately 3-5 minutes for the HVAC system and thermostat to
discover the indoor and outdoor equipment.
For a view of the DS1 switch on the outdoor
unit PC boards, see pages 20-24.
1. 17 SEER Daikin Fit
2. 18 SEER (all tonnage)
3. 20 SEER (2 and 3 Ton)
4. 20 SEER (4 Ton)
5. 20 SEER (5 Ton)
(Subtract D2 from D1 to calculate bias voltage)
19