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63UH-PRC002-EN
Mechanical
Specifications
Factory Installed Options
Control Options
Hydraulic Modulating Gas Valve
Provides modulated heat output. Ignition
is at low fire (50 percent input) and
discharge temperature sensing bulb
located in the air stream modulates the
gas input from 50 percent to 100 percent
rated input. Provided with an automatic
electric valve in series which cycles the
unit in response to a low voltage single-
stage thermostat (thermostat not
included). (Not available on 30-75 MBh
units.)
Intermittent Pilot Ignition
Solid state ignition control system ignites
the pilot by spark during each cycle of
operation. When pilot flame is proven,
main burner valve opens to allow gas
flow to burners. Pilot and burners are
extinguished during off cycle. Required
on California units.
Two-Stage Gas Valve
(Not available on 30-75 MBh units.)
Provides two stages of heat. Ignition is at
low fire (50 percent of the furnace’s rated
input). Requires the use of a
two-stage thermostat.
Hydraulic Modulating Gas Valve with
Bypass (N/A on 30-75 MBh units)
An additional electric valve in parallel
bypasses the hydraulic modulating valve,
overriding the discharge temperature
sensing bulb, allowing full fire. Requires
the use of a separate thermostat to
control the electric valve.
Electronic Modulating Gas Valve (Natural
Gas Units Only) (N/A on 30-75 MBh
units)
Provides modulated heat output. Ignition
is at full fire (100 percent input), and
modulates the gas input from 100 to 50
percent rated input. Available for use
with room thermostat or duct thermostat
with remote setpoint adjustment. Duct
thermostat available with optional
override room thermostat which causes
the unit to go to full fire when the room
temperature falls below the override
room thermostat.
Electronic Modulating
4-20 mA/0-10VDC Input
Provides modulated heat output. Ignition
is at full fire (100 percent input), and
modulates the gas input from 100
percent to 40 percent rated input.
The modulating gas valve shall operate
in response to a 4-20 mA or a 0-10 VDC
input from an external DDC control.
Heat Exchanger Options
Type 409 Stainless Steel
Heat exchanger tubes and headers are
seam welded 20-gauge Type 409
stainless steel.
Type 321 Stainless Steel
Heat exchanger tubes and headers are
seam welded 20-gauge Type 321
stainless steel (100-400 MBh only).
Additional Options
Type 409 Stainless Steel Burners
(Not available on 30-75 MBh units.)
Orifices for Elevations Over 2000 Feet
Type 409 Stainless Steel Draft Diverter
(Not available on 30-75 MBh units.)
Summer/Winter Switch
Vertical Louvers
Horizontal Louvers (Duct furnace only)
Duct Discharge Flange
Provided in lieu of louvers on units for
use with field ductwork (Centrifugal units
only)
Totally Enclosed Motor
Side Access Burner Drawer (Duct
Furnace Only)
Allows entire burner drawer to slide out
from the side of the unit for service or
inspection.
Fan Time Delay Relay —(Duct Furnace
Only)
The fan time delay relay delays the fan
start until the heat exchanger reaches a
predetermined temperature. It also
allows the fan to operate after burner
shutdown, removing the residual heat
from the heat exchanger
(Recommended on applications that
require intermittent fan.)
One-inch throwaway filters (Centrifugal
with enclosure only)
One-inch permanent filters (Centrifugal
with enclosure only)
Field Installed Accessories
Natural to LP (Propane) Gas Conversion
Package (Standing Pilot Only)
LP (Propane) to Natural Gas Conversion
Package
Flue Vent Fan
Flue vent fan provides power venting.
Provided with all fixtures for field
mounting and wiring, the flue vent fan is
activated in response to a single stage
thermostat. A centrifugal switch in the
flue vent in turn activates the automatic
electric gas valve.
High Gas Line Pressure Regulator
Reduces main gas line pressure to a
minimum of seven-inches W.C. Pressure
at the jobsite must be specified. The
regulator is selected to accommodate
that specific pressure. (Natural gas units
only.)
Discharge Nozzles
“Y” Splitter (100-400 MBh only)
30° Downward (100-400 MBh only)
60° Downward (100-400 MBh only)
90° Downward (100-400 MBh only)
Drain Pan (Duct Furnace Only)
Recommended for use with installations
on the downstream side of a cooling
coil.
Thermostats
Low voltage room thermostat single-
stage.
Low voltage room thermostat, single-
stage with summer/winter switch.
Low voltage room thermostat,
two-stage.
Universal tamperproof guard for all
room thermostats.
Low voltage duct thermostat, single-
stage.
Low voltage duct thermostat,
two-stage.
Room thermostat, electronic modulating
control.
Duct thermostat, electronic modulating
control.
Override room thermostat, for use with
duct thermostat and electronic
modulating control.