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43MUA-PRC001-EN
Accessories
Additional Factory Installed
Options
High Gas Pressure Regulator
1-5 Psig
Units 825 MBh and less require an
additional gas pressure regulator if inlet
pressure exceeds 1 psig. Inlet pressure at
the job must be specified.
5-10 Psig
An additional regulator is furnished. Inlet
pressure at the job must be specified.
Insulation
One-inch, 1½ lb. fiberglass insulation pin
spotted to casing.
Insulation on Basic Frame
Insulation on Filter Section
Internal Blower/Motor Isolation
This option includes a steel frame for
blower(s) and a fan motor with spring
type vibration isolators. It is not available
on vertical units.
Extended Grease Lines
This option allows lubrication of fan
bearings from the control side of the unit.
Controls Opposite from Standard
Inlet On-Off Duct Stat
This automatically turns the burner off
when inlet air temperature equals
desired discharge air temperature. It
works as a lockout for the burner.
Temperature range of 25 to 225 SPDT.
115V Duplex Receptacle
This option includes a transformer and
disconnect switch for the receptacle.
Components are mounted in the gas
piping manifold.
Circuit Analyzer
Provides indicator lights for maintenance
troubleshooting. If the unit is not
functioning properly, the service person
will want to know which circuits are open
and which are closed. The circuit analyzer
will tell the service person, at a glance,
the status (open or closed) of the
different circuits. If an indicating light is
lit, the circuit is in its correct operating
mode. It mounts on the control panel of
the unit. The number of lights and
functions depends on the control options
of the unit.
UV Flame Sensor
The flame sensor checks to make sure
the pilot flame has ignited before gas is
sent to the main burner. It operates by
sensing the light of the pilot flame.
Clogged Filter Switch
This option includes a pressure sensing
switch which senses the pressure drop
across the filters. When the pressure
drop reaches the setpoint, the switch
trips and lights the clogged filter light.
It is not required when City of Chicago
controls are ordered.
Exhaust Fan Interlock
This option includes a pilot duty rated
normally open contact on the main
supply fan motor starter that will close
simultaneously with the starter (10 amp
contacts).
Interlocking Relay
This option is energized by an auxiliary
contact on the supply fan motor starter
that can be used for additional
equipment that may need to run when
the supply fan is running (12 amp
contacts).
City of Chicago Controls
This option includes an access door
interlock switch, an alarm horn with
silence switch, low temperature limit,
and a clogged filter switch.
Field Installed Accessories
Vibration Feet
Rubber-in-shear vibration isolators
cannot be ordered with a roof curb —
they ship unmounted.
Vibration Feet — Basic Frame
Vibration Feet — Filter Section
Vibration Feet — Mixing Box
Seven-Day Time Clock
This option includes a Paragon seven-
day general purpose time control with a
four-pole switch.
100 DBL Alarm Horn and Silencing
Switch
The alarm horn and silencing switch are
field-wired so that if the pilot flame does
not ignite, the alarm sounds. To silence
the alarm, the push button silencing
switch is pushed.
Remote Control Station
Option includes fan and heat switches,
burner on light, alarm light, and Maxitrol
Selector or Selectrastat.
On-Off Night Setback Thermostat
This option will shut unit off when space
temperature is above setpoint. This is a
115V thermostat with a temperature
range of 50 to 80 F. Option is normally
used together with the seven-day
timeclock option.
High Gas Pressure Regulator —
Over 10 Psig
Specify inlet pressure at the jobsite. This
is required for selection of the regulator.
Roof Curbs
Roof curbs are fabricated of 12-gauge
galvanized steel. Curb gasket is provided.
The 12-inch high roof curbs ship
disassembled.
Roof Curb For Basic Frame —
No return air
Roof Curb For Basic Frame —
With return air downstream of the
burner
Roof Curb For Basic Frame —
With mixing box option