Suburban NT-30SP - User Manual

AIRXCEL, INC. - SUBURBAN DIVISION
676 Broadway Street
Dayton, Tennessee 37321
423-775-2131
www.Airxcel.com
USER’S INFORMATION MANUAL
NT-40 • P-40
NT-30SP ● NT34SP • P-40B
This book contains instructions covering the operation and maintenance of your furnace.
INSTALLER: LEAVE THIS MANUAL WITH THE APPLIANCE.
CONSUMER: RETAIN THIS MANUAL FOR FUTURE REFERENCE.
Should you require further information, contact your dealer or nearest Suburban Service Center.
Part Number 204401
02-24-2014
WARNING! Installation of this appliance must be made
in accordance with the written instructions provided in this
manual. No agent, representative or employee of Suburban
or other person has the authority to change, modify or waive
any provision of the instructions contained in this manual.
WARNING! Improper installation, adjustment, alteration,
service or maintenance can cause property damage, personal
injury or loss of life. Refer to the installation instructions and/
or owners manual provided with this appliance.
WARNING! Be sure the furnace and all ignition systems
are “OFF” during any type of refueling and while vehicle is in
motion or being towed.
WARNING! If the information in this manual is not
followed exactly, a re or explosion may result causing
property damage, personal injury or loss of life.
Do not store or use gasoline or other
ammable vapors and liquids in teh vicintiy
of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
• Extinguish any open ame
• Evacuate all persons from the vehicle.
• Shut off the gas supply at the gas container or
source.
• Do not touch any electrical switch, or use any
phone or radio in the vehicle.
• Do not start the vehicle’s engine or electric
generator.
• Contact the nearest gas supplier or qualied
service technician for repairs.
• If you cannot reach a gas supplier or qualied
service technician, contact the nearest re
department.
• Do not turn on the gas supply until the gas leak(s)
has been repaired.
• Installation and service must be performed by
a qualied installer, service agency or the gas
supplier.
MAINTENANCE AND CLEANING
WARNING! If the user of this appliance fails to maintain it in the condition in which it was
shipped from the factory or if the appliance is not used solely for its intended purpose or if
appliance is not maintained in accordance with the instructions in this manual, then the risk
of a re and/or the production of carbon monoxide exists which can cause personal injury,
property damage or loss of life.
CAUTION: Label all wires prior to disconnection when servicing controls.
Wiring errors can cause improper and dangerous furnace operation.
Always verify proper operation of furnace after servicing.
You, as the owner/user, should inspect the furnace monthly during the heating
season for presence of soot on vent. Operating the furnace under this condition
could lead to serious property damage, personal injury or loss of life. If soot is
observed on the vent, immediately shut furnace down and contact a qualied
service agency.
Listed below are several safety related items that you should follow during the
heating season to assure continued safe operation of the Furnace.
1. Inspect furnace venting. Venting must be free of obstructions, void of soot and
properly terminated to the atmosphere. (Refer to Installation Manual.)
WARNING! Do not install screens over the vent for any reason. Screens will become
restricted and cause unsafe furnace operation. Accessories are being marketed for RV
products which we do not recommend. For your safety, only factory authorized parts are to
be used on your furnace.
2. Periodically inspect the vent for obstructions or presence of soot. Soot is
formed whenever combustion is incomplete. This is your visual warning that
the furnace is operating in an unsafe manner. If soot is present, immediately
shut furnace down and contact your dealer or a qualied service person.
3. Periodically observe the main burner ame to assure it is burning with a hard
blue ame with well dened burner ports (See Figure 2). If ame appears
yellow or burner has a lazy ame, shut furnace down. It is possible that burner
needs cleaning or replaced. To inspect the main burner, remove the four (4)
screws (A, B, C and D) securing the burner access door to the combustion
chamber (See Figure 1). If excessive rust and corrosion are present on burner
surface, the burner must be thoroughly cleaned or replaced. The burner may
be cleaned using a steel wire brush and blown clean using high compression
air. Contact a qualied service person for assistance.
NOTE: To observe ame, cabinet front must be removed. Operation of burner can
then be observed through the viewing window on front of chamber (See Figure 1).
4. Keep furnace clean. More frequent cleaning may be required due to excessive
lint from carpeting, bedding material, etc. It is imperative that control
compartments, burners and circulating air passageways of the appliance be
kept clean.
5. The motor is permanently lubricated and requires no oiling.
6. Keep the furnace area clear of any combustible materials, gasoline or other
ammable vapor and liquids.
7. Before operating furnace, check the location of the furnace vent to make sure
it will not be blocked by the opening of any door on the trailer. If it can be
blocked, do not operate the furnace with the door open.
8. Do not restrict the ow of combustion air or the warm air circulation to the
furnace. To do so could cause personal injury and/or death.
9. Never operate the furnace if you smell gas. Do not assume that the smell
of gas in your RV is normal. Any time you detect the odor of gas, it is to
be considered life threatening and corrected immediately. Extinguish any
open ames including cigarettes and evacuate all persons from the vehicle.
Shut off gas supply at LP gas bottle. (See safety notice on front cover of this
manual.)
10. Immediately shut furnace down and call a service agency if furnace cycles
erratically or delays on ignition.
WARNING! Should overheating occur, or the gas supply fail to shut off, shut off the
manual gas valve to the appliance before shutting off the electrical supply.
11. Never attempt to repair damaged parts. Always have them replaced by a
qualied service agency.
12. Never attempt to repair the furnace yourself. Seek the help of a qualied
service person.
13. Never restrict the ducting installed by your trailer manufacturer. To do so
could cause improper furnace operation.

Summary

Users Information Manual

Gas Leak Detection Procedure

Procedure to follow if the smell of gas is detected, including safety steps and contacting service.

Maintenance and Cleaning

Venting Inspection

Inspect furnace venting for obstructions, soot, and proper termination to the atmosphere.

Periodic Vent Inspection

Periodically inspect the vent for obstructions or the presence of soot.

Burner Flame Observation

Observe the main burner flame to ensure it burns with a hard blue flame.

Furnace Cleaning and Maintenance

Keep the furnace clean, including control compartments, burners, and air passageways.

Motor Lubrication and Area Safety

Details on motor lubrication, keeping the furnace area clear of combustibles.

Airflow and Vent Blockage Checks

Ensure no obstructions to combustion air, warm air circulation, or furnace vent.

Gas Smell and Ignition Issues

Guidance on handling gas smells, erratic cycling, and ignition failures.

Overheating and Repair Protocols

Instructions for overheating, gas shut-off, and seeking professional repair.

Operating Instructions

Pre-Operation Safety and Checks

Essential safety checks and procedures before operating the furnace, including gas detection.

Furnace Operation Steps

Step-by-step guide for starting and operating the furnace, including thermostat settings.

Appliance Shut-Down Procedure

Instructions on how to safely turn off the gas supply to the appliance.

Parts and Service

Two Year Limited Warranty

Three Year Heat Exchanger Warranty

Details the extended warranty coverage for the furnace heat exchanger.

Warranty Limitations and Exclusions

Lists conditions and specific items not covered by the Suburban warranty.

Product Problem Resolution

Steps to follow if a product problem arises, including contacting service centers.

Overview

1. Function Description
2. Important Technical Specifications
3. Usage Features
4. Maintenance Features

This document is a user's information manual for Suburban recreational vehicle (RV) furnaces, specifically models NT-40, P-40, NT-30SP, NT34SP, and P-40B. It provides comprehensive instructions for operation, maintenance, and safety, along with warranty information.

Function Description:

The Suburban RV furnace is designed to provide heating for recreational vehicles. It operates by burning gas to generate heat, which is then circulated throughout the RV by a blower system. The furnace features an automatic ignition device, eliminating the need for manual lighting. It is crucial that the products of combustion are properly vented to the atmosphere and that combustion air is drawn from outside the RV to ensure safe and efficient operation.

Important Technical Specifications:

The manual covers several models: NT-40, P-40, NT-30SP, NT34SP, and P-40B. While specific BTU ratings or electrical requirements are not detailed in the provided text, the general operation involves gas combustion and an electrical blower. The furnace is equipped with a manual shut-off valve (on some models) and an automatic ignition device. The design includes a combustion chamber, burner, electrode, spark wire, and a burner observation window for inspection. Venting is critical, and the design ensures proper termination to the atmosphere.

Usage Features:

• Starting the Furnace:
  1. Read the User's Information Manual thoroughly.
  2. Turn the manual gas valve (if equipped) or the valve at the outside LP tank to the "OFF" position, then open it fully. Do not force.
  3. Set the thermostat above room temperature to initiate blower operation. A slight delay may occur before the blower starts.
  4. Allow the blower to run for 5 minutes for the combustion chamber purge cycle. If the blower does not start or stops before the ignition cycle, shut down the furnace and contact a dealer or service agency.
  5. After 5 minutes, move the thermostat lever below room temperature. The blower will remain on for approximately 2 minutes before turning off.
  6. Wait 5 minutes to clear any gas, then smell for gas, especially near the floor. If gas is detected, follow the "WHAT TO DO IF YOU SMELL GAS" safety instructions.
  7. Open the manual shut-off valve or the valve at the outside LP tank fully. Partial closure can lead to improper operation.
  8. Set the thermostat to the desired setting. If set above room temperature, the blower will come on.
  9. Allow 30 seconds for the main burner to light after the blower starts. The furnace has an automatic ignition device; do not attempt to light it manually.
  10. If the burner does not light, repeat steps 1 through 9.
  11. If ignition fails after three attempts, shut down the furnace and contact a service agency. Do not continuously cycle the furnace through the thermostat.
• Turning Off the Furnace:
  1. Set the thermostat to the lowest setting, then move the lever to the "OFF" position.
  2. Turn off all electric power to the appliance if service is required.
  3. Turn the shut-off valve clockwise to "OFF." Do not force.
• Safety Precautions:
  • Never operate the furnace while the vehicle is in motion or being towed.
  • Do not store or use flammable vapors or liquids near the appliance.
  • If gas is smelled, extinguish all open flames, evacuate the vehicle, shut off the gas supply, avoid electrical switches, and contact a gas supplier or fire department.
  • Do not install air boosters in the duct system.
  • Do not place clothing or flammable materials on or near the appliance.
  • Do not use the appliance if any part has been submerged in water.
  • Ensure proper venting, especially when using add-on rooms, porches, or patios.
  • Never operate the furnace with the vent covered.
  • Do not restrict the flow of combustion air or warm air circulation.
  • If overheating occurs or the gas supply fails to shut off, turn off the manual gas valve before shutting off the electrical supply.
  • Never attempt to repair damaged parts or the furnace yourself; always seek a qualified service agency.
  • Do not restrict the ducting installed by the trailer manufacturer.

Maintenance Features:

• Monthly Inspections (during heating season):
  • Inspect the furnace for soot on the vent. Soot indicates incomplete combustion and unsafe operation. If soot is present, shut down the furnace and contact a qualified service agency.
  • Inspect furnace venting for obstructions and proper termination.
  • Observe the main burner flame: it should be a hard blue flame with well-defined burner ports. Yellow or lazy flames indicate a need for cleaning or replacement.
  • To inspect the main burner, remove the four screws securing the burner access door. Clean or replace the burner if excessive rust or corrosion is present, using a steel wire brush and high-compression air.
• Annual Inspections (by a qualified service agency):
  • Inspect furnace installation and vent termination for proper security and overlap of vent tubes.
  • Inspect the combustion chamber and venting for physical soundness, absence of holes or excessive corrosion, and compliance with installation instructions.
  • Check the furnace mounting base for physical soundness, sagging, or deterioration.
  • Inspect the furnace, venting, ducting, and gas piping for signs of deterioration.
  • Inspect the combustion chamber for restrictions in exhaust or intake. Blow out any soot or loose debris with compressed air.
  • Inspect all gaskets for leakage or deterioration and replace as needed.
  • Inspect return air inlet openings for restrictions.
• General Maintenance:
  • Keep the furnace clean, especially control compartments, burners, and circulating air passageways. More frequent cleaning may be needed due to lint from carpeting or bedding.
  • The motor is permanently lubricated and requires no oiling.
  • Keep the furnace area clear of combustible materials, gasoline, or other flammable vapors and liquids.
  • Ensure the furnace vent is not blocked by trailer doors.

Suburban NT-30SP Specifications