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935SB
Up to 95% AFUE, Single-Stage, Upflow/Horizontal
Ultra Low NOx, 35-in. Tall, Condensing Gas Furnace
Installation, Start-up, Operating and Service Maintenance
NOTE: Read the entire instruction manual before starting the
installation
Approved for installations up to 5,400 feet (1646 meters)
TABLE OF CONTENTS
IMPORTANT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Table 1 - Dimension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Table 2 - Minimum Clearances to Combustible Materials for All Units
5
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 3 - Loose Parts Bag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
CODES AND STANDARDS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS PROCE-
DURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
AIR FOR COMBUSTION AND VENTILATION . . . . . . . . . . . . . . 8
Table 4 - Minimum Free Area Required for Each Combustion Air
Opening or Duct to Outdoors. . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 5 - Minimum Space Volumes for 100% Combustion, Ventila-
tion and Dilution Air from Outdoors . . . . . . . . . . . . . . . . . . . . . . 10
CONDENSATE TRAP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 6 - Condensate Trap Configurations . . . . . . . . . . . . . . . . . 13
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 7 - Evaporator Coil Spacer or Shield Requirements. . . . . 16
FILTER ARRANGMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 8 - Air Filter Selection and Duct Sizing - In. (mm) . . . . . 21
Table 9 - Opening Dimensions - In. (mm) . . . . . . . . . . . . . . . . . 21
Table 10 - Filter Media Pressure Drop (Clean) Versus Airflow - in.
w.c. (Pa) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Table 11 - Filter Media Pressure Drop (Clean) Versus Face Velocity-
in. w.c. (Pa) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
AIR DUCTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
GAS PIPING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 12 - Maximum Capacity of Pipe . . . . . . . . . . . . . . . . . . . . 24
ELECTRICAL CONNECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . 24
ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 13 - Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
VENTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 14 - Vent Termination Kit for Direct Vent (2-pipe) Systems29
Table 15 - Approved Combustion-Air and Vent Pipe, Fitting and Ce-
ment Materials (U.S.A. Installations) . . . . . . . . . . . . . . . . . . . . . 29
Table 16 - Maximum Equivalent Vent Length - Ft. . . . . . . . . . . 37
Table 17 - Deductions from Maximum Equivalent Vent Length - Ft.
(M) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Table 18 - Maximum Allowable Exposed Vent Length in Uncondi-
Portions of the text and tables are reprinted from NFPA 54/ANSI Z223.1E, with permission of National Fire Protection Association, Quincy, MA
02269 and American Gas Association, Washington DC 20001. This reprinted material is not the complete and official position of the NFPA or ANSI
on the referenced subject, which is represented only by the standard in its entirety.
tioned Space - Ft. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Table 19 - Hanger Spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
AIR DELIVERY - CFM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Table 20 - Air Delivery - CFM (with filter) . . . . . . . . . . . . . . . . 44
Table 21 - Airflow Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Table 22 - System Status Display Codes . . . . . . . . . . . . . . . . . . 46
Table 23 - Main Menu Options . . . . . . . . . . . . . . . . . . . . . . . . . . 46
SERVICE LABEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
START-UP, ADJUSTMENT, AND SAFETY CHECK . . . . . . . . . 48
Table 24 - Test Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Table 25 - Altitude Derate Multiplier for USA. . . . . . . . . . . . . . 50
Table 26 - Gas Rate (CU ft./hr). . . . . . . . . . . . . . . . . . . . . . . . . . 52
Table 27 - Gas Valve Outlet Pressure for Gas Heat Values at Altitude
- 40,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Table 28 - Gas Valve Outlet Pressure for Gas Heat Values at Altitude
- 60,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Table 29 - Gas Valve Outlet Pressure for Gas Heat Values at Altitude
- 80,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Table 30 - Gas Valve Outlet Pressure for Gas Heat Values at Altitude
- 100,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
SERVICE AND MAINTENANCE PROCEDURES. . . . . . . . . . . . 55
CARE AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
WINTERIZATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
SEQUENCE OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
PARTS REPLACEMENT INFORMATION GUIDE . . . . . . . . . . . 66
MODEL NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
TRAINING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
To learn more about this appliance and installation via a mobile device,
go to
https://bryant.hvacpatners.com/NFC
access airflow tables or troubleshooting guide on your mobile device go
to
mlctraining.com/training/techdocs/36/
or use the QR code below. To
or use the QR code below.
A220954
A200352
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Summary of Contents for Bryant 935SB
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Page 1: Table Of Contents
935SB Up to 95% AFUE, Single-Stage, Upflow/Horizontal Ultra Low NOx, 35-in. Tall, Condensing Gas Furnace Installation, Start-up, Operating and Service Maintenance Instructions NOTE: Read the entire instruction manual before starting the tioned Space - Ft........39 installation Table 19 –... -
Page 2: Required Notice For Massachusetts Installations
935SB: Installation, Start-up, Operating and Service Maintenance Instructions REQUIRED NOTICE FOR MASSACHUSETTS INSTALLATIONS IMPORTANT The Commonwealth of Massachusetts requires compliance with regulation 248 CMR as follows: 5.08: Modifications to NFPA-54, Chapter 10 2) Revise 10.8.3 by adding the following additional requirements: a. -
Page 3: Safety Considerations
935SB: Installation, Start-up, Operating and Service Maintenance Instructions A210784 Fig. 1 – Dimensional Drawing Table 1 – Dimension SHIP WT. FURNACE SIZE CABINET WIDTH OUTLET WIDTH BOTTOM INLET WIDTH AIR INTAKE LB (KG) 36040M17 17-1/2 (445) 15-7/8 (403) 16 (406) - Page 4 935SB: Installation, Start-up, Operating and Service Maintenance Instructions WARNING WARNING PERSONAL INJURY AND PROPERTY DAMAGE FIRE, EXPLOSION, ELECTRICAL SHOCK, AND HAZARD CARBON MONOXIDE POINSING HAZARD Failure to follow this warning could result in property damage, personal Failure to follow this warning could result in dangerous operation, injury, or death.
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Page 5: Introduction
935SB: Installation, Start-up, Operating and Service Maintenance Instructions 2. Install this furnace only in a location and position as specified in the NOTICE “Location” section of these instructions. 3. Provide adequate combustion and ventilation air to the furnace IMPORTANT INSTALLATION AND START-UP space as specified in “Air for Combustion and Ventilation”... -
Page 6: Codes And Standards
935SB: Installation, Start-up, Operating and Service Maintenance Instructions This furnace is designed for minimum continuous return-air temperature of 60°F (15°C) db or intermittent operation down to 55°F (13°C) db such as when used with a night setback thermostat. Return-air temperature must not exceed 80°F (27°C) db. -
Page 7: Dure
935SB: Installation, Start-up, Operating and Service Maintenance Instructions Safety body with static electricity (for example; DO NOT move or shuffle your feet, do not touch ungrounded objects, etc.). • Current edition of US: National Fuel Gas Code (NFGC) NFPA 4. If you touch ungrounded objects (and recharge your body with 54/ANSI Z223.1 and the Installation Standards, Warm Air Heating... -
Page 8: Air For Combustion And Ventilation
935SB: Installation, Start-up, Operating and Service Maintenance Instructions General WARNING These furnaces are shipped with materials to assist in proper furnace installation. These materials are shipped in the main blower FIRE, INJURY OR DEATH HAZARD compartment. Failure to follow this warning could result in personal injury, death... - Page 9 935SB: Installation, Start-up, Operating and Service Maintenance Instructions Indoor Combustion Air© NFPA & AGA CAUTION Standard and Known-Air-Infiltration Rate Methods Indoor air is permitted for combustion, ventilation, and dilution, if the FURNACE CORROSION HAZARD Standard or Known-Air-Infiltration Method is used.
- Page 10 935SB: Installation, Start-up, Operating and Service Maintenance Instructions openings in doors or floors having free area of at least 2 c. Other openings are caulked or sealed. These include joints in.2/1,000 BTUh (4,400 mm2/kW) of total input rating of all gas around window and door frames, between sole plates and floors, appliances.
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Page 11: Condensate Trap
935SB: Installation, Start-up, Operating and Service Maintenance Instructions WARNING CARBON MONOXIDE POISONING AND PROPERTY DAMAGE HAZARD Failure to follow this warning could result in property damage, personal injury or death. The condensate trap provided with furnace must be installed per the furnace installation instructions. - Page 12 935SB: Installation, Start-up, Operating and Service Maintenance Instructions appropriate plastic ties. Follow the heat tape manufacturer’s recommendations. Prime the trap before furnace operation. The condensate drain line must be supported and/or secured per local codes. Supports and clamps should be spaced to prevent the drain line from sagging or being dislocated from the furnace or termination point.
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Page 13: Installation
935SB: Installation, Start-up, Operating and Service Maintenance Instructions NOTICE Upflow installations utilizing the right side air return opening should follow the Upflow Specific Steps - Offset Installation to ensure the full opening is available for return ductwork. INSTALLATION Preparing the Furnace – Before Setting in Place 1. - Page 14 935SB: Installation, Start-up, Operating and Service Maintenance Instructions A200076 Fig. 14 – Upflow Example of Trap Adapter Installation A200119 Fig. 17 – Upflow Right Side Return Configuration - Trap Interference A200120 Fig. 18 – Upflow Right Side Return Configuration - Required...
- Page 15 935SB: Installation, Start-up, Operating and Service Maintenance Instructions (see Fig. 19). If the tube is too long, cut any extra length from the tube. Upflow Specific Steps – Offset Installation 1. Trap Offset Adapter Accessory Kit (purchased separately) is required. Instead of installing the trap to the adapter plate, screw the trap offset adapter to the adapter plate (see Fig.
- Page 16 935SB: Installation, Start-up, Operating and Service Maintenance Instructions Alternate Horizontal Option - 7. Connect additional condensate piping to a code-approved drain, or to a condensate pump approved for use with acidic furnace Remote Trap Installation Specific Steps condensate and compatible with mineral and vegetable oils, such as 1.
- Page 17 935SB: Installation, Start-up, Operating and Service Maintenance Instructions composite materials from direct exposure to any part of the heat exchanger. Consult with 3rd Party Manufacturer to ensure coil is properly shielded. Coils that are only partially shielded should be treated as un-shielded and require a spacer.
- Page 18 935SB: Installation, Start-up, Operating and Service Maintenance Instructions Connect supply-air duct to flanges on furnace supply-air outlet. Bend flange upward to 90° with wide duct pliers (see Fig. 27). The supply-air duct must be connected to ONLY the furnace supply-outlet-air duct flanges or air conditioning coil casing (when used).
- Page 19 935SB: Installation, Start-up, Operating and Service Maintenance Instructions ″ CAUTION 5/ 16 (8mm) (8mm) ″ 5/ 16 MINOR PROPERTY HAZARD ″ Failure to follow this caution may result in minor property damage. (44mm) Local codes may require a drain pan under entire furnace and condensate trap when a condensing furnace is used in an attic ″...
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Page 20: Filter Arrangment
935SB: Installation, Start-up, Operating and Service Maintenance Instructions the heat exchanger can be viewed for possible openings using light assistance or a probe can be inserted for sampling the air stream. The cover attachment shall prevent leaks. Connect supply-air duct to flanges on furnace supply-air outlet. Bend flange upward to 90°... -
Page 21: Pa)
935SB: Installation, Start-up, Operating and Service Maintenance Instructions There are no provisions for an internal filter in these furnaces. An specification sheet for performance data for a particular filter media or external filter rack is required and is purchased separately. A field IAQ device. -
Page 22: Air Ducts
935SB: Installation, Start-up, Operating and Service Maintenance Instructions Table 10 – Filter Media Pressure Drop (Clean) Versus Airflow - in. w.c. (Pa) (Continued) Representative After-Market Filter Media* 20 x 25 Filter Factory-Accessory Factory-Accessory (508 x 635 mm) Washable Media* Fiberglass*... -
Page 23: Gas Piping
935SB: Installation, Start-up, Operating and Service Maintenance Instructions GAS PIPING WARNING WARNING FIRE OR EXPLOSION HAZARD A failure to follow this warning could result in personal injury, death, FIRE OR EXPLOSION HAZARD and/or property damage. Failure to follow this warning could result in personal injury, death, If local codes allow the use of a flexible gas appliance connector, and/or property damage. -
Page 24: Electrical Connections
935SB: Installation, Start-up, Operating and Service Maintenance Instructions ELECTRICAL CONNECTIONS Table 12 – Maximum Capacity of Pipe NOMINAL LENGTH OF PIPE - FT (M) WARNING IRON PIPE SIZE 10 (3.0) 20 (6.0) 30 (9.1) 40 (12.1) 50 (15.2) IN. (MM) - Page 25 935SB: Installation, Start-up, Operating and Service Maintenance Instructions utility is sufficient to handle load imposed by this equipment. Refer to rating plate or equipment electrical specifications (Table 13). U.S.A. Installations: Make all electrical connections in accordance with the current edition of the National Electrical Code (NEC) NFPA 70 and any local codes or ordinances that might apply.
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Page 26: Accessories
935SB: Installation, Start-up, Operating and Service Maintenance Instructions For a side-mounted external electrical box, complete 6. Connect power cord power and neutral leads to furnace power leads (see Fig. 41). the following: 7. Attach furnace J-Box cover to mounting bracket with screws 1. - Page 27 935SB: Installation, Start-up, Operating and Service Maintenance Instructions Alternate Power Supplies This furnace is designed to operate on utility generated power which has a smooth sinusoidal waveform. If the furnace is to be operated on a generator or other alternate power supply, the alternate power supply must produce a smooth sinusoidal waveform for compatibility with the furnace electronics.
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Page 28: Venting
935SB: Installation, Start-up, Operating and Service Maintenance Instructions VENTING WARNING WARNING CARBON MONOXIDE POISONING HAZARD Failure to follow the instructions outlined below for each appliance CARBON MONOXIDE POISONING HAZARD being placed into operation could result in carbon monoxide poisoning Failure to follow the steps outlined below for each appliance connected or death. - Page 29 935SB: Installation, Start-up, Operating and Service Maintenance Instructions Table 14 – Vent Termination Kit for Direct Vent (2-pipe) Systems Approved Two-Pipe Termination Fittings Vent and Combustion Allowable Concentric Concentric Vent Kit 1 1/2-in. 2-in. 2 1/2-in. 3-in. 4-in. Air Pipe Diameters...
- Page 30 935SB: Installation, Start-up, Operating and Service Maintenance Instructions Non-Direct Vent (1-pipe) System in the Air For Combustion and Ventilation Section. Do not use an abandoned chimney to supply outside air to the furnace. References to In a non direct-vent (1-pipe) system, all air for combustion is taken from vent clearances required by National code authorities (see Fig.
- Page 31 935SB: Installation, Start-up, Operating and Service Maintenance Instructions A190032 Fig. 45 – Inside Corner Termination Inside Corner Terminations Inside corner vent terminations are permitted provided that: • Only two exterior walls come together to form an angle of 90 degrees to 135 degrees. There are no other exterior walls attached to either wall to form an alcove.
- Page 32 935SB: Installation, Start-up, Operating and Service Maintenance Instructions A12326 Fig. 46 – Direct Vent Termination Clearance NOTE: The following is based upon National codes for gas appliances and is provided as a reference. Refer to local codes which may supersede these standards and/or recommendations.
- Page 33 935SB: Installation, Start-up, Operating and Service Maintenance Instructions A12325 Fig. 47 – Ventilated Combustion Air and Non-Direct Vent Termination Clearance NOTE: The following is based upon National codes for gas appliances and is provided as a reference. Refer to local codes which may supersede these standards and/or recommendations.
- Page 34 935SB: Installation, Start-up, Operating and Service Maintenance Instructions Locating the Vent Termination 2. The vent termination must be located at least 3 feet from an inside corner and follow the clearance distances in the Inside Corner General Termination drawing. Combustion-air inlet pipe (direct vent/2-pipe system only) and vent pipe 3.
- Page 35 935SB: Installation, Start-up, Operating and Service Maintenance Instructions Non-Direct Vent / 1-Pipe System NOTICE The vent pipe for a Non Direct Vent (1-pipe) system must terminate outdoors. References to vent clearances required by National Code OPTIONAL CONFIGURATION FOR COMBUSTION authorities (see Fig.
- Page 36 935SB: Installation, Start-up, Operating and Service Maintenance Instructions The tee may also be connected to the intake air pipe on the side of the casing (see Fig. 52). In any configuration, it will be necessary to add the equivalent length of the tee (15 feet/5 M) to the Total Equivalent Vent Length of the venting system.
- Page 37 935SB: Installation, Start-up, Operating and Service Maintenance Instructions Table 16 – Maximum Equivalent Vent Length - Ft. Unit Size 40,000 60,000 80,000 100,000 Pipe Dia. 1 ½ 2 ½ 1 ½ 2 ½ 1 ½ 2 ½ 2 ½ (in)
- Page 38 935SB: Installation, Start-up, Operating and Service Maintenance Instructions Slope vent pipe back to the furnace at least ¼” per foot Use 45 deg. Elbows where Avoid short horizontal offsets with 90 possible, to ensure conden- deg. Elbows. Short offsets can be sate drainage.
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Page 39: Tioned Space - Ft
935SB: Installation, Start-up, Operating and Service Maintenance Instructions Representative drawing only, some models may vary. HORIZONTAL RIGHT-VERTICAL VENT CONFIGURATION A11335 A11329A Representative drawing only, some models may vary. Representative drawing only, some models may vary. HORIZONTAL RIGHT-RIGHT VENT CONFIGURATION HORIZONTAL LEFT-RIGHT VENT CONFIGURATION Fig. -
Page 40: Instructions
935SB: Installation, Start-up, Operating and Service Maintenance Instructions Installing the Vent Pipe Adapter and Combustion Air Pipe Adapter WARNING CARBON MONOXIDE POISONING HAZARD Failure to follow this warning could result in personal injury or death. To route the vent pipe and combustion air pipe through the furnace, the manufacturer supplied kit must be used. - Page 41 935SB: Installation, Start-up, Operating and Service Maintenance Instructions 15. Wipe excess cement from joint. A continuous bead of cement will ALIGN NOTCHES IN VENT PIPE VENT PIPE ADAPTER WITH GASKET COUPLING OVER STAND-OFF be visible around perimeter of a properly made joint.
- Page 42 935SB: Installation, Start-up, Operating and Service Maintenance Instructions Concentric Vent 2-Pipe and 1-Pipe Vent Termination Single or multiple concentric vent must be installed (see Fig. 43). NOTE: Follow the instructions of the vent terminal manufacturer. These Maintain the required separation distance between vents or pairs of vents instructions are provided as a reference, only.
- Page 43 935SB: Installation, Start-up, Operating and Service Maintenance Instructions Venting System Length Calculations The Total Equivalent Vent Length (TEVL) for EACH combustion air or vent pipe equals the length of the venting system, plus the equivalent length of elbows used in the venting system (Table 17).
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Page 44: Air Delivery - Cfm
935SB: Installation, Start-up, Operating and Service Maintenance Instructions AIR DELIVERY - CFM Table 20 – Air Delivery - CFM (with filter) External Static Pressure (in.w.c.) Unit Size Airflow Setting Default Setting Const. Fan Heating 36040M17 1055 1015 1110 1070 1035... - Page 45 935SB: Installation, Start-up, Operating and Service Maintenance Instructions Table 20 – Air Delivery - CFM (with filter) (Continued) External Static Pressure (in.w.c.) Unit Size Airflow Setting Default Setting Const. Fan 1055 1145 1080 1020 1235 1175 1120 1060 1000 1325...
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Page 46: Furnace Control Programming And Navigation
935SB: Installation, Start-up, Operating and Service Maintenance Instructions FURNACE CONTROL PROGRAMMING AND NAVIGATION On-Board Control Method This furnace model is equipped with an on-board 3-digit LCD display CAUTION with pushbutton navigation for the adjustment of operating parameters, diagnostics, and service. The control board must be powered to use the ELECTRICAL SHOCK HAZARD display and pushbuttons. - Page 47 935SB: Installation, Start-up, Operating and Service Maintenance Instructions Control Board Replacement Further details and instructions for these programming methods are provided with the replacement control board. If the control board must be replaced, the new board must be programmed with the correct Model Program Number before the furnace CAUTION will operate.
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Page 48: Service Label
935SB: Installation, Start-up, Operating and Service Maintenance Instructions SERVICE LABEL A210781 Fig. 61 – Service Label Information START-UP, ADJUSTMENT, AND SAFETY 4. Check all switches for continuity. CHECK 5. Install blower compartment door. Door must be in place to operate furnace. -
Page 49: Wiring Diagram
935SB: Installation, Start-up, Operating and Service Maintenance Instructions c. To initiate the component test sequence, the control must be in 4. Operate furnace per instruction on door. (idL) mode no thermostat demands (W, Y1, Y/Y2, G). Select 5. Verify furnace shut down by lowering thermostat setting below component test (Ct) from menu select buttons to start the room temperature. - Page 50 935SB: Installation, Start-up, Operating and Service Maintenance Instructions Prime Condensate Trap with Water CAUTION UNIT OPERATION HAZARD Failure to follow this caution may result in intermittent unit operation or performance satisfaction. Condensate trap must be PRIMED or proper draining may not occur.
- Page 51 935SB: Installation, Start-up, Operating and Service Maintenance Instructions 10. Turn furnace gas valve electric switch to OFF position. b. Jumper R and W thermostat connections at the furnace control board. 11. Turn gas supply manual shutoff valve to OFF position.
- Page 52 935SB: Installation, Start-up, Operating and Service Maintenance Instructions Checklist g. When correct input rate and temperature rise is achieved, turn gas valve ON/OFF switch to OFF. • Put away tools and instruments. Clean up debris. • Check Input/Output gas pressure WARNING •...
- Page 53 935SB: Installation, Start-up, Operating and Service Maintenance Instructions Table 27 – Gas Valve Outlet Pressure for Gas Heat Values at Table 28 – Gas Valve Outlet Pressure for Gas Heat Values at Altitude - 40,000 Altitude - 60,000 (Tabulated Data Based on 40,000 BTUH Input for 0-ft (0m) to 5400-ft...
- Page 54 935SB: Installation, Start-up, Operating and Service Maintenance Instructions Table 29 – Gas Valve Outlet Pressure for Gas Heat Values at Altitude Table 30 – Gas Valve Outlet Pressure for Gas Heat Values at - 80,000 Altitude - 100,000 (Tabulated Data Based on 80,000 BTUH Input for 0-ft (0m) to 5400-ft...
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Page 55: Service And Maintenance Procedures
935SB: Installation, Start-up, Operating and Service Maintenance Instructions SERVICE AND MAINTENANCE PROCEDURES Electrical Controls and Wiring Untrained personnel can perform basic maintenance functions such as WARNING cleaning and replacing air filters. All other operations must be performed by trained service personnel. A qualified service person should inspect ELECTRICAL OPERATION HAZARD the furnace once a year. -
Page 56: Care And Maintenance
935SB: Installation, Start-up, Operating and Service Maintenance Instructions CARE AND MAINTENANCE 5. Inspect any accessories attached to the furnace such as a humidifier or electronic air cleaner. Perform any service or maintenance to the WARNING accessories as recommended in the accessory instructions. - Page 57 935SB: Installation, Start-up, Operating and Service Maintenance Instructions The inducer and blower motors are pre-lubricated and require no 16. Replace blower access door. additional lubrication. 17. Cycle furnace through one complete heating and cooling cycle. Clean blower motor and wheel as follows: Verify the furnace temperature rise as shown in “Adjustments”...
- Page 58 935SB: Installation, Start-up, Operating and Service Maintenance Instructions A190266 Fig. 68 – Igniter Position - Back View 1. Disconnect power at external disconnect, fuse or circuit breaker. 2. Turn off gas at external shut-off or gas meter. 3. Remove control door and set aside.
- Page 59 935SB: Installation, Start-up, Operating and Service Maintenance Instructions 1. Turn off gas and electrical supplies to furnace. 12. Clean the relief port on collector box and the trap with a small wire. Shake any water out of the tube. 2. Remove control door.
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Page 60: Winterization
935SB: Installation, Start-up, Operating and Service Maintenance Instructions 11. Check furnace operation through two complete heat operating WARNING cycles. 12. Check for gas leaks. ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD WARNING Failure to follow this warning could result in personal injury or death, or property damage. -
Page 61: Sequence Of Operation
935SB: Installation, Start-up, Operating and Service Maintenance Instructions 9. Remove the middle unused rubber plug from the port on the the burner flame is not proved within the 2-second flame proving collector box opposite the condensate trap. period, the control CPU will open the gas valve relay GVR, de-energizing the gas valve solenoid GV. - Page 62 935SB: Installation, Start-up, Operating and Service Maintenance Instructions BLWM at HEAT speed during the selected blower-OFF delay period before reverting to continuous-blower speed. When the thermostat “calls for low-cooling”, the blower motor BLWM will switch to operate at low-cool speed. When the thermostat is...
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Page 63: Troubleshooting
935SB: Installation, Start-up, Operating and Service Maintenance Instructions TROUBLESHOOTING A221103 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. - Page 64 935SB: Installation, Start-up, Operating and Service Maintenance Instructions A221107 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
- Page 65 935SB: Installation, Start-up, Operating and Service Maintenance Instructions A221108 Fig. 70 – Troubleshooting Guide Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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Page 66: Parts Replacement Information Guide
935SB: Installation, Start-up, Operating and Service Maintenance Instructions PARTS REPLACEMENT INFORMATION GUIDE Casing Group Gas Control Group Blower door Burner Bottom plate Flame sensor Control door Gas valve Door knob assembly Hot surface igniter Top filler plate Manifold Electrical Group...
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