A
M-TRAC1
IOM-55
May 2019
15
PROFILE VELOCITY
Profile velocity test point readings outside the 4.0 -7.0 Vdc range generally indicate improper
airflow through the heater, not a problem with the M-TRAC1. Before attempting to adjust the
profile velocity ensure the heater is operating at the required nameplate air volume.
The Profile Velocity POT is typically set to the ‘12’ o’clock position. Outside air temperature will
affect the pressure drop across the burner.
2-10 VDC RESET SET UP
1.
The 2-10 VDC RESET RATIO POT is located beside terminal RP.
2.
Turn off DIP switch 1 and turn the discharge set point knob (face mounted or remote) to
the minimum required set point.
3.
Set the voltage across ter and – to maximum (10 volts).
4.
Calculate the maximum required discharge temperature (°C) and divide by 10.
5.
Turn on DIP switch 1 and adjust 2-10 Vdc reset POT ratio until the SPC voltage is equal to
the number calculated in the above step.
6.
Adjust SP LMT until the voltage reading is the same as was recorded in step 5.
SERVICE
SERVICE MODE
Placing the M-TRAC1 into service mode allows for direct control of the burner firing rate. Once
the heater has started, the M-TRAC1 can be placed into the service mode by turning on DIP
switch 8. The service POT, located above the reset push button, will control the position of the
modulating valve to any position from low to high fire.
Note: The service mode does not bypass any safeties, heat or fan switches.
SETPOINT REMOTE WIRING
Impedance from long wiring runs may cause the setpoint to be out of calibration. Refer to the
setpoint calibration section if adjustment is required.
AIR PRESSURE SENSOR
The M-TRAC1 has an internally mounted air pressure sensor. Do not blow onto the pressure
ports – too much air pressure will damage it. The ports are fragile and can easily break.
During initial startup, the space the appliance is feeding may be under negative or positive
pressure. To accurately check the M-TRAC1 pressure sensor, remove the sensing tubes from
the M-TRAC1, while the fan is on, and the reading should be 0 Vdc.
