Portal econet_moddips

Dip Switch Settings

There are 18 dip switches on the modulating EcoNet enabled gas furnaces. These dip switches when used in a communicating system are essentially useless, however, in the event the system is wired Legacy (traditional 24v wiring) you will need to set the dip switches to make the system run the way you want it to.

The Dip Switches are either one by one, or in pairs or groups. We'll cover each setting.

Dip Switch 1

Switch 1 is furnace orientation, or rather the orientation you want for the 7 segment LED. In the OFF position, the 7 segment display is for an upflow furnace. That means when you look at the display, the 6 looks like a 6. If you flip the furnace over, a 6 will look like a 9, a 7 will look like an L and so on. For this reason, the engineers decided to help you out by allowing you to flip the display based on the orientation.

So OFF is upflow, and ON is downflow. Pretty simple. What about horizontal applications? Well, it is a 7 segment LED so its going to be sideways. This technician has found that in horizontal applications, the switch should be in the ON position. The reason is, usually the technician is kneeling down in front of the furnace and leans either right or left to view the codes (depending on the horizontal direction). Based on calls, trust me.

Dip Switches 2 & 3

Switches 2 & 3 are used as a pair, meaning both switches have to be set. Ultimately this provides up to 4 choices rather than 2 you would get with just one switch.

These two switches are for the cooling/heat pump fan off delay. In other words, how long do you want the fan to stay on at the end of a cooling call to extract the last little bit of heat transfer?

The furnace is shipped with both switches OFF which is 30 seconds. That means, when the Y call goes away, the blower will stay on for 30 seconds before switching off (Or going to the constant fan speed if they have it set up to do that).

With switch 2 ON, and switch 3 OFF, the fan will remain on for 45 seconds at the end of a cooling call

When switch 2 is off, and switch 3 is ON, the fan will remain on for 60 seconds

Lastly, when both switches are OFF, the fan will shut down immediately at the end of a cooling call. Capisce?

Dip Switches 4 and 5

This pair of switches is where you are going to set up your nominal cooling airflow. The switches offer 4 choices but its going to depend on which size furnace you have as to what airflow options are offered.

If you have a 3 ton drive, the settings are as follows...

4 OFF, 5 OFF - 1200 CFM

4 ON, 5 OFF - 1000 CFM

4 OFF, 5 ON - 800 CFM

4 ON, 5 ON - 600 CFM

If you have a 5 ton drive, the settings are as follows...

4 OFF, 5 OFF - 2000 CFM

4 ON, 5 OFF - 1600 CFM

4 OFF, 5 ON - 1400 CFM

4 ON, 5 ON - 1200 CFM

Don't worry, if you don't like those choices, you can trim it using the next pair. You can get creative if you need to.

Dip Switches 6 and 7

Don't get confused by this but dip switch 6 is on the top row, dip switch 7 is on the next row. They still work as a pair

These switches are your cooling/heat pump airflow trim switches. That is, you can adjust the cooling airflow that you set up with switches 4 and 5. For example, for adding 10% to 800 CFM, you would net 880 CFM. If you reduced 100CFM by 10% you would net 900 CFM. All you have to do is figure out what airflow you need and these 4 switches can get it close.

6 OFF, 7 OFF - None

6 ON, 7 OFF - +10%/p>

6 OFF, 7 ON - -10%/p>

6 ON, 7 ON - None

Dip Switch 8

This switch is whether you want On Demand De-humidification to work or not. If you have this set up, the ODD terminal must be connected to a humidistat. When humidity is above the set point voltage will be removed and the airflow will be reduced by 15-20% depending on the furnace. It's reverse acting. When the humidity is below the set point voltage will be applied to the ODD terminal which will give you cooling airflow that you set up previously.

Just so we are clear, if the system has a heat pump outside and the B wire is connected, this will NOT impact airflow when the heat pump is in Heat Mode.

8 OFF - ODD is disabled/p>

8 ON - ODD is enabled/p>

Dip Switch 9

This switch tells the cooling airflow what do do when you have a 2 stage outdoor unit and only Y1 is calling.

Since this is not in a communicating set up, the indoor unit doesn't know what's outside or what kind of compressor is out there

If the outdoor unit has a Copeland Ultratech Scroll, then that's one thing. 1st stage is about 70% of full capacity. If you have 2 compressors outside, such as you may have in a (-)ASL 3 ton heavy or larger, 1st stage capacity is about 50%.

9 OFF - 75%

9 ON - 50%

Dip Switches 10 and 11

These switches are for an installation where the gas furnace will stage up to second stage (in gas heating mode) based on time if you only installed a single stage thermostat.

The default is an assumption you are using a two stage stat, and if you are, leave these switches alone more often than not

10 OFF, 11 OFF - None

10 ON, 11 OFF - 10 Min.

10 OFF, 11 ON - 15 Min.

10 ON, 11 ON - 20 Min.

Dip Switch 12

This is your continuous airflow setting. If your customer likes to have the fan run when the system is not heating or cooling, this switch tells the blower which speed you want it to run. Again it depends on which drive you have.

For a 3 ton drive...

12 OFF - 500 CFM/p>

12 ON - 800 CFM/p>

For a 5 ton drive...

12 OFF - 700 CFM/p>

12 ON - 1200 CFM/p>

Dip Switches 13 and 14

These two switches work in conjunction with 15 and 16 to adjust the temperature rise.

13 OFF, 14 OFF - No Adjustment

13 ON, 14 OFF - Hi Heat Only

13 OFF, 14 ON - Low Heat Only

13 ON, 14 ON - Both

Dip Switch 15

This switch determines if you want to raise (+) the temperature rise or lower (-) it.

15 OFF - Raises +

15 ON - Lowers -

Dip Switch 16

This switch determines if you want to change your rise by 2°F adjustment or 4°F adjustment.

16 OFF - 2°F

15 ON - 4°F

Dip Switch 17

Switch 17 is where you will configure your blower off delay. It will be either 90 seconds or 120 seconds.

17 OFF - 90 seconds

17 ON - 120 seconds

Dip Switch 18

Switch 18 is where you will configure comfort or efficiency mode. Efficiency mode will provide name plate mid-point temperature rise optimized for efficiency. Comfort mode will target 4 degrees above nameplate mid-point rise.

18 OFF - Efficiency

18 ON - Comfort

Just in case you wondered, there is a chart in the Installation Instructions.