The unit gas controls shall be provided with the following:
Single-stage gas controls with a single-stage combination gas control, an ignition control. The unit fires at 100%
full fire based on a call for heat from a room thermostat.
An automatic reset high limit switch mounted in the air stream to shut off the gas supply in the event of
overheating.
An automatic reset high limit switch mounted on the power exhauster housing to shut off the gas supply in the
event of overheating flue gas temperatures.
A condensate drain line overflow switch that senses if the condensate line is clogged and shuts the unit heater
down. The switch is factory mounted inside the unit cabinet and wired to the unit controls.
An energy-saver control utilizes stratified ceiling air to heat the space at floor level before turning on the gas
controls. Its operation is independent of the room thermostat and should have a higher set-point than the room
thermostat. The Stat is factory mounted outside the unit and wired into the contractor convenience box.
A Modine Building Management System (BMS) Board installed in this unit provides an RS485 interface between
the unit heater and existing building networks that employ a BACnet or Modbus protocol. The board works in
conjunction with the unit’s ignition control module to manage and report the function of the heater. A BMS network
connection is not required to operate the heater, but allows for expanded control and monitoring ability.
A time delay relay that delays the start of the air mover to allow the heat exchanger a warm-up period after a call
for heat. The time delay relay shall also continue the air mover operation after the thermostat has been satisfied
to remove any residual heat in the heat exchanger.
The unit must be field adjusted for 0-2000 feet elevation above sea level. See units installation manual for
instruction for altitude adjustments.
Electrical
All electrical components shall carry UL, ETL, or CSA certification.
A low voltage terminal board shall be provided for direct wiring connection to an external thermostat.
A Contractor Convenience Package that consists of an external junction box featuring simple connection of
supply power wiring internally, thermostat wiring to terminals eternally, an On/Off switch, a single 115V outlet for
connection of an external condensate pump, and status indicator lights to display the operational state of the unit
shall be factory mounted on the rear panel of the casing.
A single 115V to 24V step down transformer shall be provided for all unit controls.
Air Mover
The motor horsepower shall be 1/8 H.P.
The motor wiring shall be in flexible metal BX conduit.
The motor shall be controlled by a time delay relay.
Propeller models shall meet the following requirements:
The motor type shall be Single-Speed, Totally Enclosed (TE).
The air mover motor shall be a 115V motor.
Mounting