Titus Analog T3SQ-1 IOM - Manual (Page 5)

Note: This IOM is meant to demonstrate general dimensions of this product. The drawings on this IOM are not meant to detail every aspect of the product with exactness. Drawings are not to scale.
TITUS reserves the right to make changes without written notice.
Symptom Action
Thermostat not operating
properly
No Power
Check main power supply to power pack.
Check two power supplies not on same circuit. This will definitely be a problem if the two power supplies are
driven from different phases.
Check thermostat cable
If cable fine check drone cable between drone board and master controller
Replace with another wall thermostat
Replace with another power supply.
Thermostat display codes
Display 00
Unit is in special supply sensing mode, but no supply sensor is fitted.
This function will be activated when the top button is pressed for 5 seconds. It will automatically reset to
control position.
If the unit do not automatically reset to control position, the button is damaged, and the wall
thermostat needs to be replaced
Display Li
Unit is in Special commissioning mode.
This function will be activated when the bottom button is pressed for 5 seconds.
The unit will reset to control position when both buttons are pressed simultaneously.
If the unit do not reset to control position when both buttons are pressed simultaneously, the unit is
faulty.
Display Flashing digits
Unit is in Room Setpoint adjustment mode.
This function is activated when the top or bottom buttons is pressed at short intervals for up and down
adjustment of Room Setpoint
The display will automatically reset to control position.
Display 88 or 56 or possibly other numbers
Two Wall thermostats are possibly connected on the same loop. Make sure that an RJ45 cable does not loop
between two Masters. Use an RJ12 cable instead.
If unit is in supply sensing mode, more than one supply air sensor (Change over sensor is plugged into the
same loop. Every master and it’s drones can have only one CO sensor plugged in. Unplug all CO sensors
from the drones.
Inlet Heater not operating
properly
Heater not working
Check to see if the motor is working. If the motor is working, wait at least 120 seconds for the damper to get
to minimum. The heater will only be activated 120 seconds after heating mode is activated.
If motor is not working, check RJ11 and RJ45 cabling through to master.
Check to see if the main power is available to connection point of Triac on the drone board.
Check to see if the heating mode light is on the front of wall display.
If the heating mode light is on, check to see if the difference between the Set-point and room temp is big
enough to keep the heater on full time. The proportional band of the heater is between -1°F and -3°F. The
heater will therefore only be on full time if the room temperature is 3°F lower than setpoint. If the room
temperature is 1°F lower than setpoint, the heater will not fire at all.
Check RJ11 and RJ45 cabling through to master.
Check to see if another wall stat is connected to triac and will activate the heater.
If yes replace wall stat
If no, replace triac
Heater remains on
Triac failed in open position.
Master heater operates, drone heater does not
Check Cabling
T3SQ-1-IOM-5.0 6-6-09
Troubleshooting (cont.)