A
M-TRAC1
IOM-55
May 2019
12
PROFILE PLATE VELOCITY SENSING SYSTEM
The M-TRAC1 has a built in profile pressure sensor to prove and monitor air flow across the
burner. This allows the burner to operate safely and efficiently by proving the airflow is within
proper air velocity limits.
The profile pressure sensor has three non-adjustable air settings: 40, 60 and 120% of normal
airflow. These perform the equivalent function of the high (120%) and low (60%) velocity air
switches while providing an additional very low (40%) velocity for use in process applications,
when providing air is more crucial than temperature control.
The normal profile plate pressure drop is 0.48”w.c.
TEMPERATURE RESET
MAKE / BREAK THERMOSTAT
The set point can be configured for two-level discharge air temperature control, initiated by a
override contact or space mounted, single stage thermostat, with the second (upper) level
adjustable from 75˚(24°C) to 170˚F (77°C) by the SP LMT POT.
2 – 10 Vdc SIGNAL
The set point can be adjusted linearly upwards from 5°F to 50 °F (3°C to 28°C) from a 2-10 Vdc
BMS input on terminals - and +. When equipped with a 2 to 10 Vdc room thermostat, this
option becomes a linear room reset. The discharge set point dial, either face mounted or
remote mounted, is the minimum set point. The maximum reset amount is adjusted by the 2-
10VDC RESET RATIO POT located beside terminals RS and RP.
RESET EXAMPLE
SP LMT set at 95˚F, Dial set point set at 50˚F.
2-10 Vdc reset ratio POT adjusted to give 30˚F reset at 10 Vdc.
The resulting control will be:
At 0-2 Vdc = 50˚F discharge
At 6 Vdc = is ½ of the reset authority. Half of 30˚F equals 15˚F, therefore the discharge setpoint
will be at 65˚F (50° + 15° = 65°). At 10 Vdc = full reset. Discharge will be at 50° + 30° = 80˚F.
This will not be limited by the SP LMT (at 95°F), unless the setpoint dial is turned up more than
15°F.
