2800 Laura Ln, Middleton WI 53562 | 800.288.9383 Fax: 608.836.9044 | www.tcsbasys.com
27
CHECKOUT
AND
TROUBLESHOOTING
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Fan Proving
: The Fan Proving feature allows the controller to safely shut down the system in the case where the fan fails
to operate correctly, avoiding damage to the heating or cooling units. The input to this feature is an external sensor that
is connected to a Digital Input (DI) indicating that the fan is operating (closed) or not (open).
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External Time Clock: The user has the option of configuring the TC relay output as an external time clock. In this mode,
the relay is configured as being active when the unit is occupied and inactive when the unit is unoccupied.
Auto+Recirc
: This fan mode allows the user to satisfy building air recirculation requirements without running the fan
continuously, therefore saving energy. The feature guarantees that the fan runs a certain percentage of time over a given
period (both programmable), even if the fan operation due to the normal calls for heat and cool is insufficient.
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Heating And Cooling Lockout: The Outdoor Air Lockout feature provides the ability to prevent (lockout) activation of any
heat stages or cool stages based on the current outdoor air temperature reading. This is useful when implementing an
energy savings policy or preventing a furnace from running in the summer, or a cooling compressor running in the winter.
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Discharge Air Limits
: The Discharge Air Limit feature provides the ability to force a shutdown to prevent the heat or cool
stages from operating based on the current discharge air temperature reading. This is useful for protecting equipment
from damage to out of normal (or runaway) operation, while still allowing for an attempt to condition the space. When
discharge air high or low limit is in effect, heating or cooling is disabled.
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Offsets and Differentials
: Heating turns on when the space temperature falls below the heating setpoint minus the
heating offset minus the heating differential. Heating turns off when the space temperature rises to the heating setpoint
minus the heating offset. Cooling turns on when the space temperature rises above the cooling setpoint plus the cooling
offset plus the cooling differential. Cooling turns off when the space temperature falls to the cooling setpoint plus the
cooling offset. Offsets effectively create new heating and cooling setpoints. The differential determines the temperature
difference between the stage On point and the stage Off point, creating a hysteresis in the control output and preventing
rapid cycling of equipment.
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Equipment Protection Delays: Each relay output (DO) has minimum on/off times to protect connected HVAC equipment
from short cycling. These delays may be configured via the Minimum-On-Time and Minimum-Off-Time properties of the
binary output objects corresponding to each of the relays. By default minimum on & off times are two (2) minutes for all
relays except for TC,B/O, and G, which are 30 seconds.
6 Checkout and Troubleshooting
6.1 Checkout
1. Verify wiring. Wiring should be secure with no loose strands, and screws are tightened.
2.
Install the cover on the UbiquiSTAT. Make sure the cover is lined up properly and gently press the cover until it snaps
into place. Make sure that the tether does not get pinched in the case.
3.
Power up the UbiquiSTAT. Ensure the stat powers up and screen lights up.
4.
Ensure all programming has been completed correctly. See
for initial setup instructions.
5.
Navigate to the system test mode screen (Settings>Advanced>System Test Mode).
6. Turn on and off all outputs to check for proper operation.
7. Verify and test modulating outputs by incrementing and decrementing the milliamp output.
8. Run the heating test and watch the inputs for proper operation.
9. Run the cooling test and watch the inputs for proper operation.
If this unit is to be networked:
10.
Verify the UbiquiSTAT has the proper network address, baud rate, mode, and device ID.
If the network is active, verify communication by confirming that the RS-485 link status is “Connected” on the network
status screen (Status>Network Screen).
