NOTE: Weights listed are net weights for base unit only, options can change unit weights significantly. For option weights, please consult the printed catalog or your Reznor Representative.
Reznor® Model HRPD Series Rooftop Dual Duct Furnaces are designed to be used in series as the heating component in a heating, heating/cooling, or makeup air system. Each of the dual furnaces is certified for 80% thermal efficiency for use with either natural or propane gas, as specified.
Eight sizes are available from 250,000 through 800,000 BTUH input. Each furnace includes an integral power vent system which provides metered combustion air, dilutes flue products, and eliminates the need for vent caps. The weatherized, aluminized steel cabinets are mounted on 12 gauge zinc grip rails designed for setting directly on a roof or slab surface. A separate blower system, such as Reznor® Models RBA and RBL, is required for air delivery (SeeCatalog RZ-C-PO).
Each furnace has a patented Reznor® Thermocore® aluminized steel heat exchanger with venturi-design tubes. The die formed burners are of aluminized steel and include flared ports with a stainless steel insert.
Standard features for each furnace include a spark-ignited intermittent pilot and a single stage, 24-volt gas valve. Each furnace has all the required limit and safety controls including a venter pressure switch which verifies power venter flow prior to allowing operation of the gas valve.
Notes:
Burner and control access shown left hand side (standard). Specify right hand side for opposite access and connections.
Standard airflow as shown. Direction of airflow may be reversed by field relocation of airflow baffles in the heat exchangers.
One-inch fiberglass insulation full length and width of top.
Approved for installation downstream of an air-conditioning coil (optional stainless steel heat exchangers, stainless steel burners, and stainless steel bottom sections are recommended).
Not approved for residential use.
Orifices for natural gas
Aluminized steel heat exchangers (When inlet air temperature
is below 40°F or temperature rise is less than 40°F,
optional stainless steel heat exchanger is recommended.)
Aluminized steel burners with stainless steel insert
120-volt supply voltage
24-volt control voltage transformers
Redundant, single-stage combination gas valves
Spark-ignited intermittent safety pilots with electronic flame
supervision
High limit safety cutouts
Power venters
Differential air pressure switches to verify vent flow
Terminal block wiring
Left side access for burners and controls (slide out burner
drawers)
Weatherized cabinet with interlocking joints (U.S Patent
No. 5,373,653) and mounting rails
Optional Features - Factory Installed
Orifices for propane gas
Elevations to 9,000 ft
409 or 321 stainless steel heat exchangers
409 stainless steel burners
409 stainless steel bottom pans
Burner Controls for Recirculated Heating
Two-stage gas valve on each furnace (operate in
tandem from 2-stage room thermostat)
Electronic modulation, 50-100% tandem operation
from room thermostat
Gas Controls for Makeup Air
Two-stage operation with 1-stage gas valve and 2-
stage ductstat (50 or 100%)
Four-stage operation with 2-stage gas valves controlled
from 2-stage ductstats with either unit-mounted controls
or remote electronic controls with or without display
module
Mechanical modulation (50 to 100%) with unit-mounted
controls (50-100°F) with or without high fire bypass
4:1 Turndown Electronic modulation (25% of full
output) with duct probe (55-90°F) with unit setpoint, with
remote adjustment, or with signal conditioner for customer-
provided computer control
8:1 Turndown Electronic modulation (12% of full fire
output) 20-100% firing rate on first furnace controlled
from ductstat with remote adjustment and 2-stage with
outside air stat on second furnace or same turndown
capability with signal conditioner for customer-provided
computer control -- 8:1 turndown electronic modulation
requires stainless steel heat exchangers, burners, and
bottom pans (8:1 turndown not available on Size 700)
Voltage supply, 208, 230, or 460 single phase
Intermittent spark pilots with timed lockout
Fan control
Right side controls (right when facing airstream)
High and low gas pressure switches
Airflow proving switch
Curb cap base
Optional Features - Field Installed
Vent extension kits
24V, one or two stage, heating only or heating/cooling
thermostats
Room override thermostat for electronic modulation
Reznor® Model HRPD Series Rooftop Dual Duct Furnaces are designed to be used in series as the heating component in a heating, heating/cooling, or makeup air system. Each of the dual furnaces is certified for 80% thermal efficiency for use with either natural or propane gas, as specified.
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