Catalogue

60 UH-PRC002-EN
Mechanical Specifications
Two-Stage Gas Valve
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.
Electronic Modulating Gas Valve (Natural Gas Units Only)
Provides modulated heat output. Ignition is at full fire (100 percent input), and modulates the gas
input from 100 percent 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/0–10 Vdc 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.
Flue Vent Fan
Flue vent fan provides power venting. Provided factory assembled to a sealed flue collection
chamber. The flue vent fan is activated in response to a low voltage (24V) single-stage thermostat.
Note: Thermostat must be ordered.
A combustion air pressure switch is provided as standard to verify proper powered vent flow prior
to allowing the gas valve to operate.
Factory-Installed Options
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. (Not
available on 30, 45, 60 and 75 MBh units.)
Additional Options
Type 409 Stainless Steel Burners
Type 409 Stainless Steel Draft Diverter
Orifices for elevations over 2,000 feet
Summer/Winter Switch
Vertical Louvers
Duct Discharge Flange (Centrifugal fan units only) Provided in lieu of louvers on units for use with
field ductwork.
OSHA Fan Guards—All Propeller Units
OSHA fan guards are available as a factory-installed or field-installed option.
Field-Installed Accessories
High Gas Line Pressure Regulator (Natural gas units only)
Reduces main gas line pressure to a minimum of seven inches wc (water column). Pressure at the
jobsite must be specified. The regulator is selected to accommodate that specific pressure.