40
Direct-Fired Make-up Air •
MUA-SVX01A-EN
Installation
Field Wiring and Remote Control Installation
1.
Connect the power lines to the line side of the main disconnect switch.
2.
Mount and wire remote control panel, thermostats, temperature sensor, and
any other field installed controls as indicated on the unit control wiring
diagram.
3.
Connect the wires to the appropriate field wiring terminals as indicated on
the unit control wiring diagram.
4.
If the optional low temperature limit was not an integral part of the heater,
the factory recommends that a low temperature limit control be installed in
areas where freeze protection is needed in the even of burner shut down.
5.
Field wiring shall have a temperature rating of at least 105°C. The minimum
size of the supply cable circuit shall be sufficient for the maximum ampacity
of the heater.
Locating Temperature Controls
The room or outdoor thermostats should be mounted where they will not be
subjected to direct impact of the heated air or radiant heat from the sun. It is also
recommended that thermostats, especially those with mercury bulb contacts, be
mounted on a vibration free surface. The side of building columns away from the
heater or interior walls are usually the location best suited for mounting
thermostats.
Controls with outdoor bulbs require that the outdoor bulb be shielded fro direct
radiation from the sun. Unit mounted sensors are factory located and mounted.
WARNING
Hazardous Gas!
On heaters which recirculate room air, outside ventilation air must be provided
in accordance with the information shown on the heater nameplate. Failure to
maintain proper ventilation could result in death or serious injury or property
damage.
Air Recirculation
Recirculation of room air may be hazardous in the presence of
•
Flammable solids, liquids, and gases.
•
Explosive materials such as grain dust, coal dust, gunpowder, etc.
•
Substances such as refrigerants or aerosols which may become toxic when
exposed to heat or flame.
Recirculation is not intended in uninsulated buildings where outside
temperatures fall below 32°F (0°C).
Excessive recirculation or insufficient ventilation air which results in inadequate
dilution of combustion products generated by the heater, may cause hazardous
concentration of carbon monoxide, nitrogen dioxide and other combustion
products in the heated space.
