Oxbox J951X Series Gas Furnace

Product Overview

The Oxbox J951X is a high-efficiency, single-stage condensing gas furnace designed for upflow or horizontal installation. It can be installed free-standing in a utility room, basement, or enclosed in an alcove or closet. The extended flush jacket provides a pleasing appliance appearance. This furnace is design certified by CSA for application in Canada and the United States.

Features and Benefits

• 100% fired and tested: All units and components are tested on the manufacturing line.
• 30-second blower delay at start-up ensures warm duct temperatures. Adjustable blower off settings (60, 90, 120, and 180 seconds).
• 30-second post purge increases heat exchanger life.
• Hot surface igniter: Utilizes a silicon nitride type igniter.
• Flexible category IV venting system: Can be vertically or horizontally vented using either a one-pipe or two-pipe system for maximum installation flexibility.
• High Static Blowers: All models are equipped with high static blowers.
• Low Boy Height: Easy to apply in low ceiling applications, works well with taller high SEER coils, and is easier to handle and install.
• Tubular primary heat exchanger: Features a heavy gauge aluminized steel heat exchanger and a stainless steel secondary heat exchanger for long life.
• 60-second fixed cooling cycle blower-off delay (TDR) enhances cooling performance.
• Multi-speed direct drive blower: Designed for a wide range of cooling capacities, with switches on the PCB for easy motor speed selection.
• LP convertible: Simple burner orifice and regulator spring change for easy convertibility.
• Integrated control board: Includes connections for electronic air cleaner and humidifier.
• Two-piece door design: Enhances furnace appearance and uses captured screws to prevent losing them.
• Blower Compartment: Sealed door reduces air leakage and is insulated for quiet operation.
• Sealed Vestibule: Reduces burner and inducer sound levels.
• Furnace Air Leakage: Complies with Energy Star cabinet air leakage requirement of less than or equal to 2%.
• PolyPro by DuraVent: Tested and approved for installation with DuraVent's PolyPro venting system.

California Compliance Note: For installations in SCAQMD & SJVAPCD areas, this furnace does not meet the SCAQMD rule 1111 or SJVAPCD rule 4905 NOx emission limit (14 ng/J). It is not eligible for the Clean Air Furnace Rebate Program. More information can be found at: www.CleanAirFurnaceRebate.com.

Gas Furnace Components

Diagram showing the internal components of the Upflow/Horizontal Furnace. Key components labeled include: Finish Flange, Flame Sensor, Roll-Out Switch, Main Air Limit Switch, Inducer Limit Switch, Pressure Switch (Inducer), Inducer Assembly, Blower Door Switch, Motor Choke, Blower Assembly, Igniter, Gas Valve, Furnace Control Board, Pressure Switch (Condensate), Transformer, Motor Control Board.

Dimensions

J951X* Upflow / Horizontal Furnaces

NOTE: Dimensions shown in inches.

Top View: Shows furnace width (Dimension B) and flange details. Width B is 19 inches.

Bottom View: Shows furnace depth (Dimension C) and front/bottom panel details. Depth C is 23 1/2 inches.

Left Side View: Shows overall height (34 1/2 inches) and connection points for Vent pipe (Ø 3"), T-stat (Ø 7/8"), Electric (Ø 7/8"), Gas (Ø 1 5/8"), and Condensate (Ø 1 1/16"). Width A is 25 3/8 inches.

Front View: Shows furnace width (Dimension A) and connection points for T-stat (Ø 7/8"), Vent pipe (Ø 3"), Electric (Ø 7/8"), Gas (Ø 1 5/8"), and Condensate (Ø 1 1/16"). Includes details on 4 knockouts (both sides). Depth is 24 7/8 inches.

Right Side View: Shows furnace depth (Dimension C) and connection points for Vent pipe (Ø 3"), Gas (Ø 1 5/8"), and Condensate (Ø 1 1/16"). Includes details on 4 knockouts (both sides). Width is 23 inches.

Venting

All models are approved for vertical non direct (1 pipe) and direct (2 pipe) venting applications. Refer to the Vent Table for specified sizes and allowable lengths.

Notes on Venting:

1. Subtract 2.5 ft. for each additional 2" elbow and 3.5 ft. for each additional 3" elbow.
2. Two 45-degree elbows are equivalent to one 90-degree elbow.
3. One short radius elbow is equivalent to two long radius elbows.
4. Do not include termination elbows in the calculation of vent length.
5. This table is applicable for elevations from sea level to 2000 ft. For higher elevations, decrease vent pipe lengths by 8% per 1000 ft. of altitude.
6. Only the listed pipe materials are approved for use with J951x Condensing Furnaces.

Model Identification Code

The model number provides detailed information about the furnace configuration:

• Brand: Oxbox
• Model Family: Indicates AFUE rating (e.g., 95 = 95% AFUE).
• Gas Valve Stages: 1 = 1 Stage, 2 = 2 Stage, M = Modulating Stage.
• Blower Type: P = PSC Motor, E = ECM Motor, X = X13 Constant Torque Motor, V = Variable Speed Motor (Constant CFM).
• Input BTUH: Specifies the input capacity (e.g., 072 = 72,000 Btuh).
• Cabinet Width: A = 14.5", B = 17.5", C = 21.0", D = 24.5".
• Orientation: U = Upflow/Horizontal Left/Horizontal Right, D = Downflow, M = Multi-position.
• NOx Digit: S = Standard, T = 40 Ng/J NOx, L = 14 Ng/J NOx.
• Nominal Cooling Airflow: 3 = 3 Tons, 4 = 4 Tons, 5 = 5 Tons, V = Variable.

Specifications

* AFUE for Upflow/Horizontal application.

Accessories

Certifications and Disclaimers

This appliance is supported by various certifications, including NAHB, ETL Listed, Energy Star, CSA, AHRI Certified, NATE, and HRAI.

Before purchasing this appliance, read important energy cost and efficiency information available from your retailer. Specifications and illustrations are subject to change without notice and without incurring obligations. Printed in U.S.A (07/2022).