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65UH-PRC002-EN
Mechanical
Specifications
High Efficiency Indoor Gas
Duct Furnaces
General
Units are completely factory assembled,
piped, wired, and test fired. All units are
AGA Certified and conform with the
latest ANSI Standards for safe and
efficient performance. Units are provided
with four point suspension hangers, and
are available for operation on either
natural or LP (propane) gas.
Casing
Casings are die-formed, 20-gauge
galvanized steel and finished in baked
enamel. The bottom panel is easily
removed to provide access to the
burners, pilot and orifices. The pilot is
also accessible through a side panel
access plate. The high limit switch is
accessible through a side panel access.
Duct discharge flanges for simple
ductwork connection are provided.
Heat Exchanger
Standard heat exchanger construction
consists of seam welded 20-gauge
aluminized steel tubes and 18-gauge
aluminized steel headers.
Burners
Burners are die-formed, corrosion
resistant aluminized steel, with stainless
steel port protectors. Port protectors
prevent foreign matter from obstructing
the burner ports. Burners individually
removable for ease of inspection and
servicing. Each burner is provided with
an individually adjustable, manually
rotated air shutter adjustment. Air shutter
adjustment is fixed when side access
burner drawer is supplied.
Controls
A factory installed junction box is
provided for all power connections.
Standards units are provided with a
24-volt combination single-stage
redundant gas valve, consisting of a
combination pilot solenoid valve,
automatic electric gas valve, pilot filter,
pressure regulator, pilot adjustment and
manual shutoff. A flue vent fan relay and
combustion air proving switch is also
provided as standard. Standard
equipment includes spark-ignited
intermittent pilot system with electronic
flame supervision. A 24V control
transformer and a high limit are
provided.
Flue Vent Fan
Flue vent fan is factory assembled to a
sealed flue collection chamber and
provides power venting. The flue vent
fan is activated in response to a low
voltage (24V) single-stage thermostat. A
combustion air pressure switch is
provided as standard to verify proper
powered vent flow prior to allowing the
gas valve to operate.
Control Options
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. (Thermostat not included.)
Hydraulic Modulating Gas Valve
Provides modulated heat output. Ignition
is at low fire (50 percent input) and
discharge temperature sensing bulb
located in the airstream modulates the
gas input from
100 percent to 50 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.)
Hydraulic Modulating Gas Valve with
Bypass
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)
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
Additional Options
Type 409 Stainless Steel Burners
Orifices for Elevations over 2000 feet
Type 409 Stainless Steel Draft Diverter
Summer/Winter Switch
Horizontal Louvers
Horizontal and Vertical Louvers
Side Access Burner Drawer
Allows entire burner drawer to slide out
from the side of the unit for service or
inspection.
Fan Time Delay Relay
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)