Titus Lynergy - Manual (Page 4)

4
TROUBLESHOOTING
Problem: No Heat when called for.
1) Confirm the jumper setting is correct for the input given.
a) If the controls are outputting Vdc, the jumper should be set as shown on page 1 for applications LX3, and
LX4.
b) If the controls are outputting 24Vac, the jumper setting should be set as shown on pages 1 & 2 for
applications LX1, LX2, LX5, LX6, & LX7. (Also see diagrams on page 6 & 7)
2) Check that wiring to the EHM is correct.
a) If using applications LX3 and LX4, confirm the positive Vdc connection is wired to the “Signal” terminal,
and the negative Vdc connection is wired to the “Com“ terminal.
b) If using 24Vac, confirm the wires are terminated correctly at (5) with a connection at “iCom”. If an “Aux”
terminal (2) on the EHM has been jumpered to “iCom”, make sure that the opposite 24Vac input is what is
outputted at the controls (See page 7 for one example).
3) Check that airflow is above minimum. Terminal units with electric heat come with pressure switches to insure that
heater elements have airflow over them. See catalog for minimum airflow required for specific size terminal units.
Fan boxes must have minimum downstream static of 0.2”.
4) Check that discharge temperature setpoint is not below the airflow temperature.
5) Check Relay wiring. Solid state relays are polarity sensitive. The wire from “+” on the EHM control board should be
terminated on “+3” VDC terminal of the relay. The wire from “-“ on the EHM control board should be terminated on
“4-“ VDC terminal of the relay. If there are two relays used in the heater, the relays are daisy chained from “4-“ to
“+3” together (See page 7 for one example).
Problem: Discharge Temperature not at Temperature Setting.
1) Check that wires from sensor are stripped and terminated in EHM control terminals.
2) Check that wires from controls are terminated at the correct point on EHM board. Inrease or stage 1 signal should be
terminated at “Inc”. Decrease or stage 2 signal should be terminated at “Dec”.
3) Check volt setting. Use chart and procedure on page 3.
4) Check sensor placement. Make sure that sensor is well placed vertically in ductwork and at least 36” from discharge.
Sensor tip should not touch inside of ductwork.
5) Try staging or ramping of output on oversized heaters. When controls call for full heat from cooling mode, if heaters
are too large and heating times are small, the heater output may be over setpoint. Staging or ramping of output over a
60 second interval will provide smooth transition. If only one output of heat is available from controls, application
LX5 will proportionally ramp heat output from 0 to 100% over a 2 minute 15 second span.