Specifications

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SECTION V - UNIT START-UP GENERAL
Before attempting to start the heater read and
understand the the sequence of operations and
electrical schematic, and the Digital Control
System user manual.
WARNING: During installation, testing, servicing
and trouble shooting of this product, it may
be necessary to work with live electrical
components. Have a qualified licensed
electrician or other individual who has been
properly trained in handling live electrical
components to perform these tasks. Failure to
follow all electrical safety precautions when
exposed to live electrical components could
result in death or serious injury.
Make sure all manual gas valves are closed.
Make sure all doors and service panels have been
closed or replaced.
Turn main disconnect switch off. Check the incoming
line voltage to match unit rating plate rating. If voltage
is over ±10% of nameplate rating or phase voltage
unbalance is over 2%, notify contractor or power
company.
Fans Are Enabled And Disabled By The Following:
MDT And MRT Standard:
By rotating the remote “Temperature Setpoint” knob
(MP-15).
Clockwise will enable the fans.
Counterclockwise will disable the fans.
MRT-PRO With Smart Room Sensor:
To enable the fans and place the unit in the Occupied
Mode press the “Manual On” button on the face of
the (TS-02) MRT-PRO room sensor. Pressing the
“Warmer” button will add 30-minute increments of
time for a total of 9-hours of operating time. To disable
the fans and place unit in the Unoccupied Mode press
and hold down the “Manual On” button. Alternately
pressing the “Manual On” button will also decrease
the amount of operating time until it reaches zero and
turns the fan off.
MRT Expert or MDT Expert With A BACview (KP-01):
To enable the fans go to “Unit Modes” and enter
[MANUAL], this mode will enable the fans.
To also enable the fans go to “Unit Modes” and enter
[AUTO], this mode has four different functions that
control the fans and unit operation. They are a Time
Clock, Heating and Cooling Night Setbacks, and signal
from an external source to an auxiliary digital input.
To disable the fans go to “Unit Modes” and enter
[OFF].
NOTE: A BACview or PC is required to change Unit
Modes. For a more detailed control sequence see
the Digital Control System User Manual.
If power supply meets requirements, turn main
disconnect switch on and Enable fans. Damper
opens (if applicable). Blower fan turns on. See
operating modes in Digital Control System user
manual.
Disable the fans. Check supply blower for proper
rotation.
NOTE: To change rotation of the blower, simply
interchange any two (2) of the line leads of the
motor starter for three (3) phase motors. On single
phase motors refer to motor nameplate.
Enable the fans. Check for proper blower rpm. Check
that all motor amp draws do not exceed rating plate
ratings and overloads are set to motor rating plate
amps.
Check all dampers for proper operation, and linkage
does not bind, see “Sequence of Operation”, and
Digital Control System user manual for damper control
modes.
Disable the fans.
CAUTION: While performing startup or servicing
the unit when the ambient temperature is warm,
care must be taken not to damage the optional
lube lines on the bearings when the burner is in
high fi re.
Setting The Pilot Flame
NOTE: Before attempting to light the pilot and main
burner you need to review Section X for proper
Manifold and Valve Adjustments. A BACview 6 or
PC will be required to change setpoints.
Check the gas supply pressure by replacing the plug
fi tting on tthe pilot line with a pressure gauge having
appropriate range, and opening the manual pilot
valve. Check that the pressure reading is within the
specifi ed range on the rating plate.
NOTE: To adjust gas pressure on supply lines
where a regulator has been installed (to reduce the
inlet pressure to rating plate maximum pressure),
remove dust cap of main gas regulator and turn
adjusting screw clockwise to increase pressure or
counter-clockwise to decrease pressure.