Tiffin Motorhomes 2014 Allegro Bus Owner's Manual

2014 Allegro Bus

–Owner’s Manual

MADE TO MOVE YOU.

105 2nd Street NW / Red Bay, Alabama 35582 USA / 256.356.8661 / [e-mail]

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General Information

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Volume 3

TIFFIN MOTORHOMES , I N C .

Allegro Bus Owner’s Manual

© Tiffin Motorhomes, Inc.
105 2nd Street NW, Red Bay, AL 35582 U.S.A.
Telephone [phone] • Facsimile 256.356.8219
E-Mail: [e-mail]

DISCLAIMER

Many of the features and appliances described in this manual may or may not be reflected in the actual motor home purchased,
depending on the options and models selected by the motor-home owner. All items, materials, instructions, and guidance described in
this manual are as accurate as possible at the time of printing. However, because of Tiffin Motorhomes’ ongoing and dedicated
commitment to excellence, improvement of Tiffin’s motor homes is a continuing process. Consequently, Tiffin Motorhomes reserves the
right to make substitutions and improvements in its makes and models of motor homes without prior notification. Substitutions
of comparable or better materials, finishes, appliances, instrumentation, and instruction may be made at any time it is deemed prudent
to provide the customer with the best possible motor home meeting the customer’s requirements.

Copyright © 2013 by Tiffin Motorhomes, Inc. – all rights reserved
Printed in the United States of America: First U.S. Printing: October 2013
[20131031]

TABLE OF CONTENTS

Chapter 1

General Information

Delivery 1-2

Dealer Responsibilities 1-2

Customer Responsibilities 1-2

Tiffin Motorhomes Limited Warranty 1-3

Major Equipment Manufacturers 1-3

Warranty Service 1-4

Owner’s Information Package 1-5

Customer Relations 1-5

Specification Labels 1-5

Weighing Procedures for the Allegro Bus 1-7

Weight Distribution of the Motor Home 1-7

Chapter 2

Driving & Safety Instructions

Safety Considerations 2-2

General Warning 2-2

Prior to Departure 2-3

Driving 2-4

Fuels for the Motor Home 2-5

Liquid Propane (LP) Gas System 2-6

LP Gas Regulator 2-7

LP Distribution System 2-8

Recommended Precautionary Practices 2-8

Fire Safety 2-9

Fire Extinguisher 2-9

Smoke Detector 2-10

Emergency Exit Window 2-10

Parking Procedures 2-10

Towing Hitch 2-11

Chapter 3

Heating & Air Conditioning

Furnace 3-2

Hydro Hot Heating System 3-3

Air-Conditioning System 3-5

Thermostatic Controls 3-5

Liquid Propane (LP) Tank 3-6

LP Tank Filling Practices 3-7

LP Gas Regulator 3-7

CO/LP Gas Detector 3-8

Chapter 4

Major Appliances &
Accessories

Refrigerator 4-2

Microwave/Convection Range 4-2

Air Filtration Fan 4-2

Cook Top 4-3

TELEVISION SYSTEM OPERATION 4-3

Television Antenna 4-3

Television Sat. Dish Control (Optional) 4-4

Television Sets 4-5

Infrared Repeater 4-5

Steering Wheel/Dash Radio 4-6

AM / FM / CD Stereo System 4-6

Navigational System 4-9

Home Theater System 4-9

Cable & Telephone Jack 4-10

Dishwasher (Optional) 4-10

Hydro-Hot Heating 4-11

CB Radio System Antenna Connection 4-13

Triple Vision Camera Monitor System 4-13

Side-Mount Camera 4-15

Stacked Washer/Dryer (Optional) 4-16

Carbon Monoxide/LP Gas Detector 4-16

Chapter 5

Cabinets & Furniture

Cabinets 5-2

Furniture 5-3

Bedroom Area 5-4

Chapter 6

Structural Features

Chassis Features 6-2

Alignment 6-2

Chapter 7

Electrical Features

General Information 7-2

Circuit-Breaker Boxes 7-3

Auxiliary Start Switch 7-4

Battery Inspection and Care 7-4

Battery Disconnect Panel 7-7

120-Volt AC (VAC) Receptacles 7-8

12-Volt DC (VDC) Receptacles 7-8

Multiplex System 7-9

Ground-Fault-Circuit Interrupt (GFCI) 7-10

Inverter / Converter 7-10

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TABLE OF CONTENTS

Chapter 7

Electrical Features (Con’t.)

Energy Management System 7-12

Electrical Generator 7-12

Automatic Transfer Switch 7-13

Electric Power Cord Reel 7-14

Fuse Blocks 7-14

Seven-Pin Towing Connector 7-15

Chapter 8

Slide-Out Features

SLIDE-OUT OVERVIEW 8-2

General Considerations 8-2

Operating Precautions 8-3

Extending the Slide-Out Room 8-3

Retracting the Slide-Out Room 8-4

Chapter 9

Exterior Features

Towing Hitch 9-2

Exterior Sides 9-2

Security Lights 9-2

Roof & Ladder 9-2

Leveling System (Hydraulic) 9-3

Leveling System (Air) 9-4

Electric Steps 9-5

Mirrors 9-7

Chapter 10

Interior Features

Bedspread 10-2

Flooring 10-2

Heated Tile Floor (Optional) 10-2

Ceiling 10-3

Ceiling Fan 10-3

Safe 10-4

Window Treatments 10-4

Chapter 11

Plumbing & Bath Features

FRESHWATER SYSTEM 11-2

Monitor Panel 11-2

Kitchen Sink 11-2

Bath, Sink, Shower & Accessories 11-2

Water Pump 11-3

City Water Connection 11-3

Filling the Freshwater Tank 11-4

Sanitizing 11-4

Water Filter 11-6

Freshwater Lines 11-6

WASTEWATER SYSTEMS 11-6

General Information 11-6

Toilet 11-7

P-Traps 11-8

Black-Water Holding Tank 11-8

Gray-Water Holding Tank 11-9

Wastewater Disposal 11-9

Sewer Connection and Camping 11-10

No-Fuss Flush 11-10

Exterior Shower 11-11

Hydro-Hot Heating System 11-12

Chapter 12

Windows, Awnings,

Vents & Doors

Windows 12-2

Awnings 12-2

Vents 12-4

Doors 12-4

Keyless Lock 12-5

Chapter 13

Routine Maintenance

EXTERIOR CARE 13-2

Washing 13-2

Seals 13-3

Proper Sealants for Application 13-4

Striping and Decals 13-4

ALCOA Aluminum Wheel Care 13-5

Roof Care and Maintenance 13-5

Moisture Management 13-6

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TABLE OF CONTENTS

Chapter 13

Routine Maintenance (Con’t.)

RV Finish Maintenance 13-10

Tire and Tire Safety Information 13-11

Tire Pressure 13-24

INTERIOR CARE 13-28

Carpet 13-28

Fabrics 13-30

Walls and Ceiling 13-30

Dashboard 13-31

Woodwork and Floors 13-31

Countertops 13-32

Accessories 13-33

Detectors 13-33

Condensation 13-33

ROUTINE MAINTENANCE

SCHEDULES 13-34

Monthly 13-35

Every Three Months 13-35

Every Six Months 13-35

Annually 13-35

Winterizing 13-36

De-Winterizing 13-38

Chapter 14

Maintenance & Data Charts

Motor Home Owner’s Data Sheet 14-2

Motor Home Maintenance Record 14-3

Motor Home Maintenance Record 14-4

Motor Home Maintenance Record 14-5

Motor Home Maintenance Record 14-6

Motor Home Maintenance Record 14-7

Motor Home Maintenance Record 14-8

Motor Home Maintenance Record 14-9

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TIFFIN MOTORHOMES –ALLEGRO BUS® Chapter 1 GENERAL INFORMATION

GENERAL INFORMATION

1-1

Delivery

Throughout the entire manufacturing process your Tiffin motor home has been regularly inspected by our qualified
personnel to assure you of the finest product of the highest quality, without exception. However, the final inspection
at our factory is not to be the last one. The pre-delivery inspection and system check that your dealer performs are
the final inspections done to your particular motor home prior to your actually receiving your new Allegro Bus motor
home. Your dealer is also available to assist you in understanding the warranties and completing the necessary forms
to activate the warranties for the various appliances and accessories installed in your motor home.

Dealer Responsibilities

1. A pre-delivery inspection and systems check is performed to assure a thorough inspection of the motor
home and to assure the proper operation of all factory-installed components.

2. A customer walk-through is performed to familiarize the new customer with the motor home, its systems
and components, and their proper and safe operation.

3. Delivery of the Owner’s Information Package, which contains warranty cards and registrations for the
vehicle and all factory-installed components from other vendors and suppliers to Tiffin Motorhomes.
The detailed operation instructions and maintenance instructions on these components are also
included in this package.

4. Assisting the customer in completing the registration forms to avoid loss of warranty coverage. The dealer
should review the limited-warranty provisions with the customer to stress the importance of completing
the warranty cards and registration forms for the components in the motor home to enable the
manufacturers to receive them within the prescribed time limits.

5. Providing the customer with information regarding warranty and non-warranty work on the vehicle and its
separately warranted components.

Customer Responsibilities

The customer is responsible for regular and proper maintenance of the motor home. Properly maintaining your motor
home will prevent conditions arising from neglect that are not covered by your Tiffin Motorhomes limited warranty.
The maintenance guidelines in this manual and any other, applicable manual(s) should be followed. It is your
responsibility and obligation to return the vehicle to an authorized dealer for repairs and service.

To assist you in avoiding problems with your motor home, it is recommended that you do the following:

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TIFFIN MOTORHOMES –ALLEGRO BUS® Chapter 1 GENERAL INFORMATION

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TIFFIN MOTORHOMES –ALLEGRO BUS® Chapter 1 GENERAL INFORMATION

1. Read the warranty. Go over it thoroughly with your dealer to make sure you understand all the
terms and conditions of the warranty.

2. Inspect the motor home; do not accept delivery until after you have gone through the motor
home with the authorized Tiffin Motorhomes dealer. Ask questions about anything

unfamiliar to you.

3. Please ask questions about anything you don’t fully understand about your Allegro Bus; Tiffin
Motorhomes is here to serve you and assure that you have all the information necessary for your
safe and enjoyable use of your new motor home.

4. When you are taking delivery, set an appointment for adjustments. This appointment should be
within two weeks after you accept delivery.

5. You are responsible for and expected to use your Allegro Bus in a responsible, safe manner.
Please take the time to familiarize yourself with the proper operation of the motor home and all its
features before you attempt to use your motor home.

Tiffin Motorhomes Limited Warranty

The Tiffin Motorhomes limited warranty was provided to you by your authorized Tiffin Motorhomes dealer during the
pre-delivery inspection. When you inquire about your Tiffin Motorhomes warranty, please refer to this document.
Should you need or desire an additional copy or other information, please contact:

Tiffin Motorhomes, Incorporated
105 2nd Street NW
Red Bay, AL 35582 U.S.A.
Telephone: [phone]; Facsimile: [phone]
E-Mail: [e-mail]

Tiffin Motorhomes will be pleased to send you an additional copy or any other information requested, as may
be warranted.

Major Equipment Manufacturers

The following list is a compilation of the vendors and suppliers of the major subsystems and components of
your Allegro Bus. This list is provided for your convenience and is not meant as a complete substitution of the
literature and accompanying “how to contact us” information supplied by those vendors and suppliers in your
Owner’s Information Package [see next page for particulars]. Where appropriate, web-site information is provided
for computer users.

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TIFFIN MOTORHOMES –ALLEGRO BUS® Chapter 1 GENERAL INFORMATION

• Atwood Mobile Products [phone] www.atwoodmobile.com

• LP Gas Water Heater [phone] www.rvcomfort.com

• Denso Corporation [phone] www.globaldenso.com

• Flexsteel Industries [phone] www.flexsteel.com

• HWH Corporation [phone] www.hwhcorp.com

• Kwikee [phone] www.kwikee.com

• Norcold, Inc. [phone] www.norcold.com

• Onan Corporation [phone] www.onanindiana.com

• Panasonic Corporation [phone] www.panasonic.com

• Power Gear [phone] www.powergear.com

• RV Products (Coleman A/C) [phone] www.airxcel.com

• Saf-T-Alert (CO/LP Alarm) [phone] www.safetalert.com

• Sharp Corporation [phone] www.sharp-usa.com

• Suburban Manufacturing Co. [phone] www.suburbanmanufacturing.com

• The Dometic Corporation [phone] www.dometic.com

For those wishing more information (e.g., locations of authorized subsidiaries), the following web site,
www.rvamerica.com/data/s_alist.htm, should be helpful. This site provides complete, alphabetic listings of
all suppliers and vendors for all contemporary recreational vehicles and motor homes.

Warranty Service

If any warranty service may be required, that service needs to be completed during the warranty period (basic
warranty: 12 months or 12,000 miles). Tiffin Motorhomes warrants its unitized construction for 10 years and
its laminations for 5 years. Any service work performed after the expiration of the Tiffin Motorhomes
warranties WILL NOT be covered by those warranties.

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TIFFIN MOTORHOMES –ALLEGRO BUS® Chapter 1 GENERAL INFORMATION

Exceptions may be made, on an individual basis, to this deadline on account of the unavailability of parts
and/or service appointment time where work is to be performed. However, don’t rely on the possibility of an
exception; please schedule any desired in-warranty work before your warranty expires.

Owner’s Information Package

The Owner’s Information Package (Figure 1-2) includes valuable documents about
your Allegro Bus and its
components and systems. By consulting the booklets and instruction
manuals included in the Owner’s Information Package, you will learn how to
operate, maintain, and troubleshoot these items safely and effectively. The Tiffin
Motorhomes Allegro Bus Owner’s Manual does not cover every possible detail of
equipment—standard and/or optional—installed on or in your vehicle.

As with all valuable documentation, please keep them in a safe, secure
place for your later use and consultation. Please complete the warranty
registration form and return to Tiffin Motorhomes Inc. within five
working days. A stamped copy will be returned to you for your records.

Again, please keep this document in a safe, secure place for your later use and consultation.

Customer Relations

If you wish to schedule maintenance or service or wish to order parts, you should notify your local authorized
Tiffin Motorhomes Dealership to set up an appointment. If you are unsure of the location of your nearest,
authorized Tiffin Motorhomes Dealership; please access the Tiffin Motorhomes website at
www.tiffinmotorhomes.com and then click on the “Dealer Locater” button, then enter in the appropriate
search criteria such as zip code and search radius or dealer name and state, then click on “Find Locations”—
the dealer’s name, address, and telephone number will then be displayed for your use.

Specification Labels

There are two main numbers used to identify your Allegro Bus. The Vehicle
Identification Number (VIN) is the legal identification of the completed
vehicle. The VIN is the number used by the state for vehicle identification
and registration. Additionally, there is a Tiffin Motorhomes serial number.
The Tiffin number is needed when you plan to make an appointment for

service or ordering parts through your Tiffin Motorhomes Dealership or
Service Center. This number can be found on the side of the dashboard.
A typical sample of this identification label is shown in Figure 1-3.

Another label affixed to your Allegro Bus is the Recreational Vehicle Industrial Association (RVIA) Weight
Label (Figure 1-4) which is a required label for your vehicle. Tiffin Motorhomes, a manufacturer-member of

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Figure 1-2. Owner’s Information

Package

Figure 1-3. Tiffin Serial Number

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TIFFIN MOTORHOMES –ALLEGRO BUS® Chapter 1 GENERAL INFORMATION

RVIA, has the obligation to disclose the following information, at minimum, to the
purchaser of the motor home:

• An indication of the contents of the RVIA weight label affixed to the
motor home.

• A concise explanation of the following items:

• Vehicle Weight (VW) distribution.

• Proper weighing techniques to be used to weigh
the vehicle.

• Specific definitions for the following terminology:

• Gross Vehicle-Weight Rating (GVWR) – This is the maximum
permissible weight of the motor home when it is fully loaded.

• Unloaded Vehicle Weight (UVW) – This is the weight of the
motor home, as built at the factory, with full fuel, engine oil, and coolants. The UVW does not
include cargo, fresh water, LP gas, or any dealer-installed accessories.

• Cargo-Carrying Capacity (CCC) – This is the maximum weight of all occupants including the driver,
personal belongings, food, fresh water, waste water, LP gas, tools, tongue weight of towed vehicle
[if any], dealer-installed accessories, and the like. The CCC is equal to or less than the GVWR minus
the UVW.

• Gross Combination-Weight Rating (GCWR) – This is the value specified by the chassis
manufacturer as the maximum allowable loaded weight of the motor home with a towed trailer
and/or vehicle [if any].

• Sleeping-Capacity Weight Rating (SCWR) – This is the maximum weight capacity of the combined
number of persons (i.e., number of people multiplied by 154 pounds per person) permitted to
sleep within the vehicle.

• Gross Axle-Weight Rating (GAWR) – This is the maximum allowable weight for a single-axle
system, as measured at the tire-ground interfaces. The GAWR considers the weakest link in the
tire, wheel, brakes, hubs, axle, springs, and attaching parts. To illustrate, if the axle is rated at
15,000 pounds and the tires are rated at 3,200 pounds each as a dual installation; then the
maximum GAWR would be 12,800 pounds for a four-tire vehicle

• Towing Guidelines – Specific weighing instructions and guidelines are furnished in the Owner’s
Manual (see below for a general overview and also in Chapter 2 for more specific details).

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Figure 1-2. Owner’s Information Package

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TIFFIN MOTORHOMES –ALLEGRO BUS® Chapter 1 GENERAL INFORMATION

Weighing Procedures for the Allegro Bus

To weigh the motor home properly, the motor home should be level when the weighing process is performed.
Your Allegro Bus motor home has been designed and built in compliance with the recommended limits of the
major-component/system suppliers to provide a realistic CCC. However, it is up to the final user to provide
even distribution of the loads brought into the motor home to prevent uneven loading. Once the motor home
is loaded, it can be taken to any drive-on scales or individual-wheel scales to determine that the final weight is
within specified limits for the motor home. The procedure which can be used is as follows:

First, drive the motor home onto the scales so that all wheels are on the scales; this provides the gross vehicle
weight (GVW) of the motor home and can be recorded as such. The GVW should not exceed the GVWR
specified for the motor home. Second, drive the motor home so that the front wheels are off the scales and
only the rear wheels remain on the scales; this provides the total weight of the motor home, save for the front
axle. This weight should not exceed the total rating of the axles remaining on the scales. The front axle weight
is determined by subtracting the weight from the GVW that was obtained in the first step which was performed
earlier. The result should not exceed the listed front-axle weight rating. For a more thorough weighing of the
motor home, Chapter 14 contains more specific axle-weight determinations.

Weight Distribution throughout the Motor Home

To assure the maximum stability of the motor home under static (i.e., parked) and dynamic (i.e., moving)
conditions, the distribution of the items to be carried and stored within the motor home and in the storage bays
underneath the motor home should be performed in such a manner to strive for reasonably even side-to-side
and front-to-rear dispersion of the entire weight of both the stored items and also the driver and expected
passenger(s) during transit. This process will assure that the motor home is not “lop-sided” in weight
distribution (i.e., all the stored weight on one side and/or mainly towards the front or the rear)—keeping a
center of mass of the motor home essentially centered on a front-to-rear and side-to-side basis will also provide
better control of the motor home when it is in motion.

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DRIVING & SAFETY INSTRUCTIONS

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TIFFIN MOTORHOMES –ALLEGRO BUS® Chapter 2 DRIVING & SAFETY INSTRUCTIONS

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Safety Considerations

Prior to using your motor home, especially for the first time or after a long period of non-use, please read
thoroughly all the instructions in both the Owner’s Manual and the chassis-manufacturer’s manual before
attempting to operate your motor home. There are several safety considerations which you should realize and
follow while your Allegro Bus is in motion. These safety considerations, as well as others meant to preclude
any damage to the motor home, are listed in this chapter. Besides the driver, it would be helpful for the
passengers to be familiar with these safety considerations and precautions, too.

Warning

Before your motor home is to be operated, be sure that you have read the entire

Owner’s Manual and that you fully understand the equipment on your motor home

and how to use that equipment safely.

Warning

Any portable, fuel-burning (e.g., charcoal, propane, butane, wood) equipment

must not be used inside the motor home. Any use of such equipment inside

the motor home may readily cause fires and/or asphyxiation by carbon-monoxide

poisoning. Further, such unauthorized use would probably invalidate

your motor-home insurance policy.

General Warning

In general, there are several “common-sense” safety precautions that should be taken every time the
motor home is to be used on the road; these precautions include:

• Only seats with seat belts should be used while the motor home is in motion; those seat belts should be worn
by all people (driver, passengers) in the motor home at that time.

• While the motor home is moving, lock all seats in the forward-facing position to provide maximum safety
for the users.

• While the motor home is moving, no one inside should ever stand or kneel on seats
(e.g., young children).

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TIFFIN MOTORHOMES –ALLEGRO BUS® Chapter 2 DRIVING & SAFETY INSTRUCTIONS

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• In the majority of states, it is the law that seat belts must be used (fastened snugly about the chest
and hip areas), anytime the motor home is in motion, to provide desired protection in the event
of a crash.

• Any fire extinguisher(s) should be inspected on a monthly basis to assure that each extinguisher is
properly charged and ready for operation.

• Any smoke and/or carbon-monoxide (CO)/liquid propane (LP) gas alarm(s) should be regularly inspected and
tested. If being used for the first time, the smoke and/or CO alarm should be properly activated and fresh
batteries installed before the motor home is placed into service. Prior to any trip, the smoke and/or CO/LP
gas alarm(s) should be manually tested to assure their correct operation. Immediately replace any defective
components (e.g., weak batteries). Never sleep in a motor home not having functional smoke and/or CO/LP
gas alarm(s). Should an alarm or detector fail when in transit, a suitable replacement can be purchased at most
hardware stores, superstores, or drug stores.

• While the motor home is moving, the sleeping facilities are not to be used.

• In the event of an emergency, be sure that everyone in the motor home is familiar with all escape exits
(doors, escape window). Do not use the emergency window as a routine exit; this is strictly to be used for
emergency purposes only. When the motor home is parked, be sure that the emergency exits are not
inadvertently blocked.

Prior to Departure

For your continued safety and convenience, the following is a representative “check list” designed to
assure your safety while driving:

• Clean all windows, mirrors, and light lenses (front, back, side) to assure that you can “see” and “be seen.”
Reposition any mirrors or other fixtures to provide an unobstructed view (front, sides, and back) from the
driver’s seat (see Chapter 9 for details). When another driver takes over, reposition the mirrors and other
fixtures for that driver.

• Remove or secure all loose exterior fixtures (e.g., awnings, flags, antennas, portable lights) to keep
them from falling from the motor home when the motor home is in motion.

• Make a “walk-around” visual inspection of the motor home to note any irregularities (e.g., loose
trim) or problems (e.g., under/over inflated tires; abrasions or nicks on the tires); correct noted
problems accordingly.

• Check all exterior storage-compartment and generator-compartment doors to make sure that they are
properly latched and locked. If need be, check inside all exterior compartments to make sure that all cargo
and equipment are properly secured so that they won’t work loose and become hazards during sudden
starts and stops.

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TIFFIN MOTORHOMES –ALLEGRO BUS® Chapter 2 DRIVING & SAFETY INSTRUCTIONS

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• Check tires for proper inflation (i.e., cold inflation pressure: 100 psig or so); if the motor home has not been
used, make sure that the “cold inflation” pressure is maintained. If the motor home has very recently been
used, make sure that the “hot inflation” pressure (see the tire manufacturer’s literature to determine
appropriate “hot inflation” pressure) is maintained. All tire pressures should be within 1-2 pounds (psig) of
each other, unless weight loading dictates otherwise (see Chapter 14, Section 14-23).

• Examine wheel lug nuts to assure their proper tightness. If any lug nuts were found to be loose, first check
the fit of the wheel to the hub to make sure that the wheel is not mis-mounted which would produce a
“wobbly” wheel when the motor home is in motion, then tighten the lug nuts.

• Check all fluid levels (e.g., engine oil, transmission fluid, coolant, power-steering fluid, brake fluid,\
battery fluid [if applicable], windshield-washer solvent) to assure correct levels are maintained.
Fill any low reservoirs, as needed.

• DO NOT SUBSTITUTE any other fluids for specified oils, transmission fluid, brake fluid, or other hydraulic
fluids—in most instances, substitutions are not acceptable and may void warranties.

• Prior to starting the motor-home engine, make sure that all lines (e.g., water, sewer) and electrical power
cords are disconnected and properly stowed.

• Assure that the leveling jacks are in the “travel” position.

• After entering the motor home, make sure that the electrically-actuated, retractable step has properly
operated to retract the step fully before starting the engine of the motor home.

Driving

Various adjustments need to be made to assure the driver’s comfort and the safety of the motor home before
starting and moving the motor home; these include:

• The driver should adjust the driver’s seat, the tilt steering, the exterior
rear-view mirrors, and the instrumentation panel (Figure 2-1) lighting
(if night-time) for the driver’s comfort and safety. This is especially
important for first-time use so that the driver may become
accustomed to the “feel” of the motor home and know where the
various adjustments are located “before the fact”; not after some
need arises while the motor home is in service.

• The driver should be familiar with all gauges, instruments, switches,
and indicators on the instrument panel (Figure 2-1) prior to driving.

Should the driver encounter any “unknowns” on the panel, they
should be investigated (via the Owner’s Manual or Owner’s Information
Package) prior to departure so that the driver fully understands these items and their functions.

Figure 2-1. Driver’s Instrumentation Panel

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TIFFIN MOTORHOMES –ALLEGRO BUS® Chapter 2 DRIVING & SAFETY INSTRUCTIONS

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• One should never adopt a “learn as you go” philosophy, as there are too many controls and switches to be
understood before the motor home is actually used. Please take the time to become thoroughly familiar with
the entire instrument panel prior to using the motor home on the road.

• Do not operate the cruise-control function during any extreme weather situations (e.g., snow, ice, sleet,
heavy rain) or when road conditions are hazardous (icy, snowy, winding roads, city traffic) or when a
constant speed of the motor home is not possible or if traffic conditions don’t warrant such.

• Avoid driving the motor home through any standing water. If deep enough, such water can wet the brake
pads and cause fading of the brakes (i.e., loss of braking power) and lead to excessive sliding or pulling to
one side or another.

• If one has driven through standing water, at the first opportunity safely to do so, check the braking action.
If braking has degraded, lightly apply the brakes to allow the brake pads to dry—don’t use the motor home
when the braking function is significantly reduced.

• Know the limits of operation of the motor home. Don’t try to achieve excessive speeds, climb overly steep hills,
traverse overly long grades, attempt to use the motor home as an “off-the-road” (OTR) motor home, rapidly
switch lanes, or rapidly accelerate or decelerate the motor home. When in doubt about the handling
characteristics of the motor home, consult your chassis manual for information.

• The solar or blackout shade is operated by a switch located on the driver’s console. Depress the switch to lower
or raise shade. The switch will be labeled “VISOR.” The time delay switch must be held a few seconds before it
is activated. CAUTION: DO NOT over extend the shade as this may block the view of the road.

Fuels for the Motor home

Your motor home is designed to use low sulfur fuel only for the engine used in the routine operation of the
motor home—these require prudent and safe handling to assure safety of the
motor home and its occupants; namely:

• Anytime the motor fuel (i.e., diesel fuel, see Figure 2-2) or the LP tank
(see Figure 2-2) is to be filled, the motor home engine is to be turned
“off,” all pilot lights must be extinguished, and appliances turned “off.”

• Further, during any filling operation or connecting/disconnecting of any
LP tanks, a NO SMOKING policy should always be observed. In a similar
manner, any other comparable devices of the motor-home users (e.g.,
butane camp-lights, propane lights and grills) should be treated in a

similar manner to assure the safety of all concerned.

Figure 2-2. Fuel Tank Fill Door

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Liquid Propane (LP) Gas System

A warning label is conspicuously located near the LP gas container (Figure 2-4); that label reads:

Warning

Liquid propane (LP) gas containers, gasoline, or other

flammable liquids are not to be placed or stored inside the

motor home because a fire or explosion may occur. LP

gas containers are equipped with safety valves that may

relieve excess pressure by discharging gas into the

atmosphere—any containment of that vented LP gas

constitutes an explosive hazard.

Warning

DO NOT FILL the LP Container(s) to more than 80% of capacity.

Any overfilling of the LP gas container(s) can result in uncontrolled gas flow—a
prime condition for a fire or explosion. The LP container should only be filled to 80%
of its capacity; the remainder of the cylinder space is vapor space to contain
expansion of that liquid when subjected to varying ambient-temperature conditions.
Filling in excess of 80% of the liquid volume of the container reduces that vapor
space and, thus, creates a condition for possible over-pressurization of the

• NEVER use an open flame to test for LP gas leaks or to examine the fluid levels in the fuel tanks.

• After filling any LP system, immediately replace and secure all protective covers and caps.

• After closing the LP valve, close and securely latch the LP door to prevent unintentional access or damage.

• NEVER connect natural gas to the LP gas system—LP gas and natural gas are not interchangeable.

• NEVER use any other “burning” equipment (e.g., charcoal grills, wood stoves, butane lights, propane
lights) inside the motor home—doing so may cause fires and/or asphyxiation.

Figure 2-3. Liquid Propane Tank

Figure 2-4. Liquid Propane Tank

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LP Gas Regulator

The LP gas regulator (Figure 2-4, center of picture) is the most critical element of the LP-gas distribution system.
The regulator converts the high-pressure LP gas from the tank into a reduced-pressure LP-gas supply suitable for use
in the various appliances in the motor home. One should regularly inspect visually the regulator system.

Warning

When the motor home is not in use, be sure to close the main LP gas valve at the

tank. When the LP gas tank is to be refilled, close the main valve to preclude the

chance of the pilot lights possibly igniting fumes from the LP fuel. As some LP-gas

appliances (e.g., refrigerator, furnace, water heater) have Direct Spark Ignition (DSI)

systems, it is very important that these appliances be turned “off” when the LP gas
is “off.” The DSI boards will continue to work (i.e., generate an ignition spark) even

when there is no LP gas available.

All LP appliances in your motor home have been
approved for use in motor homes by a nationally
recognized testing laboratory (i.e., UL and CSA
certified). When properly used, LP gas is a clean-burning
fuel which can be dependably used.

In actuality, the LP container contains liquid propane
under high pressure. The liquid, when it passes through
the tank valve to a lower pressure, vaporizes into a gas,
and then passes through a regulator to maintain a
constant pressure. This gas, then, is the actual fuel
distributed through the LP-gas manifold system to the
LP-based appliances used in your motor home.

LP-appliance-lighting problems are typically caused
by an improperly adjusted gas regulator. NEVER
attempt to adjust or reset the gas regulator yourself,
as an authorized service technician is needed to make
these adjustments. As a good preventive-maintenance
activity, the regulator should be checked semi-annually
by a service technician and also before every
extended trip.

Even though the LP-gas system is leak-checked and
verified at the factory at the time of manufacture,
normal usage (travel vibrations, etc.) could loosen the
fittings. Consequently, it is wise to check the gas fittings
periodically for leak tightness. One can daub some leak­detector solution (e.g., a “liquid-soap”-like solution) on
all the fittings, connections, and junctures when the
system is under pressure. Should there be any leaks,
small bubbles will appear at any leak sites.

Generally, loose fittings can be tightened (with “non­sparking” tools) to stop the leaks. If this process doesn’t
work, then one must shut off the main gas valve at the
LP cylinder(s) and immediately consult an authorized
service technician to determine what repairs are
necessary. Leaks may also be detected by noting the
sulfurous odor (i.e., rotten eggs) associated with LP gas
[caused by an additive added to the normally odorless
LP gas].

DO NOT search for a leak by using a match or open
flame.

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Warning

The LP gas distribution system in your motor home is designed for

liquid propane (LP) gas ONLY. DO NOT attempt to connect and use any

natural-gas or butane-gas systems with this LP gas system.

LP Distribution System

The primary LP distribution system in the motor home is a black, steel pipe manifold running the length of the
motor home. The secondary distribution lines running from this main distribution system are usually copper
tubing with flare fittings. If any of the gas lines break, do not attempt to splice them—always run new lines to
maintain the safety of the motor home. It is strongly recommended that only qualified service technicians
perform this work.

Remember, the main valve at the LP gas tank must be closed whenever any gas appliance is to be installed,
removed, or serviced—this process prevents LP gas leakage which could result in a possible harmful explosion. If the
odor of LP gas (e.g., rotten eggs) is ever detected, immediately discontinue use of any gas appliances and seek the
services of a qualified service technician.

Recommended Precautionary Practices

The following practices are recommended to assure continued safety and reliability of the LP gas system; these are, of
course, representative; not necessarily exhaustive. In all cases, use common sense in the use of the LP system.

• Visually inspect the LP fill valve before any refueling operation to look for foreign materials or debris; remove,
as necessary, to assure a leak-tight connection.

• Prior to any re-fueling operation of the LP gas system, shut off all the pilot lights.

• NEVER, under any circumstances, check for LP gas leaks with any type of open flame; doing so would
probably cause an explosion and subsequent fire.

• Periodically inspect visually the entire LP gas distribution system; do so at least semi-annually and before any
major trips. Should problems be noted, seek the services of a qualified service technician to make necessary
repairs and perform any maintenance.

If any damage or corrosion is noted, contact an authorized service technician to inspect and repair or replace
the regulator. Do not attempt to adjust the regulator yourself; the regulator has been pre-set at the factory.
Only a qualified LP service technician using specialized equipment should adjust the regulator.

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Fire Safety

As with any enclosed system containing the three required conditions for fire (i.e., combustible materials,
oxygen, ignition sources), there will exist the possibility of fire. Tiffin Motorhomes has taken every precaution
and design practice to minimize or negate this possibility, but the final determination rests with the owner and
user of the motor home. Accordingly, it is in the best interests of the owners, users, and their guests to be
aware of basic fire-safety practices and procedures and those particular features that Tiffin Motorhomes has
provided for fire safety.

Fire Extinguisher

The Allegro Bus is equipped with a fire extinguisher (located on the passenger’s console, see Figure 2-5) rated
for both Class B (i.e., grease, gasoline, diesel fuel, flammable liquids) and Class C (i.e., electrical) services—these are

typically the most likely types of fires to be expected in motor homes. Read and
understand the accompanying owner’s manual on that extinguisher (found in your
Owner’s Information Package) and remember the location of the extinguisher. In an
emergency, you won’t have the time or presence of mind to do so then. You may wish to
purchase other extinguisher(s) [e.g., for the rear interior, around the generator outside;
etc.] at your discretion.

These types of fire extinguishers are pressurized, mechanical devices and require that
appropriate care be used in their safe storage and use. The owner’s manual will provide
necessary guidance for the proper storage, handling, and use of the extinguishers.
Prudent preventive maintenance suggests monthly inspection of any fire extinguisher to
assure that it is sufficiently pressurized (i.e., the needle on the gauge is in the “normal”
zone) and that the mechanical components are not blocked in any way.

Do not test a fire extinguisher by partially discharging the unit—this will cause a loss of

pressure and may lodgesome fire-retardant materials in the valve mechanism and cause
the extinguisher to continue to vent slowly down to zero pressure. Rather, if an extinguisher is ever partially used;
continue its use until the unit is completely discharged then have the fire extinguisher fully recharged at an appropriate
service center (one can call any fire department for information on having an extinguisher recharged in that particular
locality). DONOT wait a long time to recharge an empty fire extinguisher; you’ll never know when it may be needed.

Should a fire occur inside or around the motor home, evacuate the motor home quickly and calmly—do
not panic. In the event of heavy smoke or extensive flames, keep low (crawl if you must) and make your way to
the nearest exit (door, emergency window) and leave. If the fire involves a fuel source (e.g., motor fuel, LP gas);
consider the probability of an explosion and move sufficiently far away to minimize personal harm. If such is
available, immediately place a call to the local fire department (or ask someone nearby to do so) to report the
fire. Consider the cause and the consequences of the fire and the risks associated with possibly fighting the fire
yourself before trying to extinguish it—DO NOT expose yourself or others to unnecessary danger.

Figure 2-5. Fire Extinguisher

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Smoke Detector

The Allegro Bus motor home is equipped with a battery-operated smoke detector (Figure 2-6) located on the ceiling in
the living area of the motor home (left-hand side of picture). Read and become familiar with the operation and periodic
testing of this detector. The smoke detector should be tested on a weekly basis, before each trip, and after any period
of storage of the motor home. If a low battery condition is noted or the alarm “chirps” to indicate a low-battery
condition, immediately replace the battery.

It would be prudent to keep replacement batteries in the motor home for
any in-transit replacements so that the smoke-alarm capability is never
compromised. DO NOT disable the smoke detector for any transient, false
alarm (e.g., cooking smoke, dusty furnace, tobacco smoke); rather, ventilate
the motor home with fresh air and the alarm will reset.

Emergency Exit Window

In the rear of the motor home, there is an emergency exit window (Figure
2-7) in the bedroom—this window is designed for an emergency exit when
it is not practical to exit by the door [also an emergency exit] in the front of
the motor home. This window is readily noticeable by its red handle and
the red “EXIT” label on that window.

To use this window as an emergency exit, lift the handle and push outward
on the window. As required, the window can be closed by pulling the
window inwards and then lowering the handle to latch the window back in
place. When the motor home is to be parked, it would be wise to note

where this window will be so that this exit won’t be blocked (e.g., against a
tree, pole, or wall).

Parking Procedures

To park the motor home in any unfamiliar terrain, examine the prospective site for surface irregularities, slopes
or inclines, and other discontinuities (i.e., stumps, rocks, external connections for power/water/sewage) and
also examine the area immediately above the proposed parking site for obstructions (e.g., tree branches and
limbs, signs, overhead wiring).

If the motor home is to be backed into the proposed parking site, strive to have that site be on the driver’s left hand
side, as this will allow the driver to watch the rear of the motor home. Back up slowly and use the side
mirrors and the back-up camera as a guide or, better yet, have another person outside provide supplemental
guidance to help park the motor home.

Figure 2-6. Smoke Detector (Left)

Figure 2-7. Emergency Exit Window

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When the motor home is finally situated, shift the transmission into neutral, set the air brakes, and then turn “off” the
engine. Activate the leveling-jack system (see Chapter 9 for more detail) to level and stabilize the motor home.

If the motor home is to be powered externally, connect the 120 VAC power to the motor home. Turn “on” the LP gas
valve at the LP tank. Connect the fresh-water supply and sanitize the water systems (see Chapter 11), as needed.
Connect the waste drain hose to the external sewer hook-up. Start the refrigerator, water heater, and furnace; as
warranted. Light the oven pilot light, as needed. Certain appliances, such as the refrigerator, will not work properly if the
motor home is not level, so be sure to complete the motor home leveling process before activating any of the
appliances.

Towing Hitch

The Allegro Bus is fully capable of towing typical motor vehicles; the motor home is equipped with a Class 3,
15,000-pound towing hitch (Figure 2-8) and associated wiring connector.
The motor home is capable of towing light loads and instructions for such are
found in the chassis-manufacturer’s literature in the Owner’s Information
Package provided with the Allegro Bus.

As a towed vehicle being pulled by a motor home represents a greater
complexity in driving for the driver (e.g., turning, backing, parking), one
should not attempt such on the road without first practicing such (e.g., in a
vacant lot) to master these skills.

The total weight of the motor home and any vehicle towed by that motor
home must not exceed the Gross Combined Weight Rating (GCWR). When
the motor home is being weighed, remember to account for passengers and their locations in the motor home.
Any vehicles to be towed by the motor home should have adequate active braking.

The wiring connector provided is a standard seven-pin connector, a more detailed description of which is
provided in Chapter 7. If needed, the connector for the trailer brake actuator is normally located beneath the
access panel located on the dashboard pod. However, your Bus may not have an access panel. The connector is
usually to the left of the steering column under the dash.

Figure 2-8. Class 3 Towing Hitch

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HEATING & AIR CONDITIONING

2-1

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Warning

Never attempt to modify the furnace. To do so may cause fire,

explosion, carbon monoxide poisoning, and/or asphyxiation. If the furnace

is malfunctioning, immediately shut the unit “off” and call a trained

service technician to make necessary repairs as soon as possible.

The Allegro Bus motor home is equipped with a forced-air furnace fueled by LP gas. The furnace is controlled by the
wall-mounted thermostat (Figure 3-1) located inside the motor home—this thermostat controls both the heating and air
conditioning for the motor home.

In the heating mode, the furnace heats air which, in turn, is circulated through ductwork in the floor of the motor home.
If any obstruction(s) block the floor vent(s) or air-return register, then the furnace will not function properly. Therefore,
any items stored under the cabinets should be carefully stowed to prevent damaging or crushing the furnace ducting or
blocking the warm-air return.

When a furnace is being used for the first time, there may be an initial “burn-off” of manufacturing compounds or
residues left on the heat exchanger or in the ductwork which could produce odors, fumes, and possibly some smoke.
This occurrence is normal and should not cause concern, unless it persists for an excessive amount of time.

To minimize the after-effects of this “burn-off” process, the initial use of the furnace should be done with all the doors
and windows open to permit normal air circulation to dissipate these possible odors and fumes. For routine operation
of the furnace, set the thermostat to the desired temperature setting and then turn “on” the thermostat; in about a
minute, the furnace should begin to operate and warm or hot air should be coming through the ductwork.

To shut down the furnace, turn the thermostat to the “off” position. Even
though the thermostat may be turned “off,” the furnace system will continue
to run for about a minute or so to permit a gradual cool-down of the heating
system which is normal.
On a regular basis, thoroughly clean the complete furnace and air-tube
passageways to remove dust, lint, and any other possible obstructions. Leak­test the entire LP gas system at least semi-annually. Also check and clean the
air-blower system annually.

Any access hatches to the furnace are for authorized service personnel only, as

there are no user serviceable parts on the furnace. Accordingly, do not
attempt to tamper with the interior of the furnace.

Figure 3-1. Thermostat

Furnace

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Warning

Be cautious when washing the exterior of the motor home; water should never be

sprayed directly into the furnace vent. Should any water be forced beyond the rain

baffles into the furnace vent, the furnace may rust which, in turn, may cause

improper combustion and produce unwanted by-products of combustion.

Before the beginning of each travel season, the furnace should be thoroughly cleaned and inspected. Any obstructions,
debris, or lint which may obstruct free air flow or impede the operation of the air circulation system should be removed.
For example, accumulated dust or lint could possibly obstruct the orifices for the pilot light or may accumulate on the
blower blades and unbalance the operation of the blower. Additionally, any debris in the ductwork, when heated by
the furnace, could emit unpleasant odors or possibly become a fire hazard.

Consequently, the furnace system should be periodically cleaned; annually is recommended unless the motor home is
subjected to dust levels significantly greater than average; in which case more frequent cleaning is recommended.
The Owner’s Information Package provides recommended cleaning tips and procedures; when needed, a more
thorough cleaning should be performed by a qualified service technician.

Hydro-Hot Heating System

Your Allegro Bus will feature a Hydro-Hot heating system (Figure 3-2) that
provides a continuous, on-demand supply of domestic hot water, as well as
interior zone heating where and when it is needed. Both heating features are
accomplished by a unique VDC-Powered Diesel-Fired Burner and a VAC­Powered Electric Heating Element (120 VAC). These two heating sources
maintain the temperature of the Hydro-Hot’s solution of water and antifreeze.

To activate the Hydro-Hot heating system, the hydro-hot switch (labeled “diesel
burner switch”) located in the side cabinet above the driver’s seat must be
activated. By activating this switch, a supply of hot water as well as interior heat

can be provided. The heating feature will be controlled by the thermostat
mounted on the wall. It is operated off the furnace function of the thermostat to
provide interior heat.

If interior heat and hot water are demanded from the Hydro-Hot system at the
same time, hot water will simultaneously take precedence over interior heat;
therefore causing the interior heat to shut down and turn off
until the water flow is turned off from water sources.

Figure 3-2. Hydraulic Heating System

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Caution

Your Hydro-Hot heating system operates off the coach’s sole diesel tank! Keep in
mind that the Hydro-Hot fuel tube is located higher up in the diesel tank than the

coach’s engine fuel in order to prevent complete depletion of the diesel fuel tank.

Be sure an adequate amount of fuel is in the fuel tank before dry camping.

The surge tank (Figure 3-3), located in the basement, should be routinely inspected to make sure the antifreeze
fill line stays in the acceptable zone. If the antifreeze becomes low, you must add the recommended antifreeze stated

in the Hydro-Hot’s owner’s manual. If antifreeze is totally depleted from the surge
tank, a switch will be released inside the main Hydo-Hot tank disabling the system
from operating. Antifreeze will then have to be added to the tank to reactivate the
switch and allow the system to operate.

If batteries accidentally become discharged and the Hydro-Hot system is activated,
the system will automatically shut down before batteries are totally discharged. Once
power is restored to batteries, the system must be reset
by depressing the reset button on the black panel of the

surge tank (Figure 3-3).

For detailed instructions on operating the Hydro-Hot Heating system, refer to the specific
owner’s manual found in the Owner’s Information Package.

Figure 3-3. Surge Tank

Figure 3-4. Control Panel

Caution

DO NOT operate the Diesel-Burner and/or the Electric Heating Element

without the water and antifreeze solution in the Hydro-Hot’s Boiler Tank.

Failure to do so will cause serious damage to the Heater.

Caution

Yearly maintenance is required on the burner portion

of the Hydro-Hot heating system

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Air Conditioning System

The factory-installed air-conditioning system is designed for 120 VAC power supplied either from the external power
hookup cord or from the generator. Any unnecessary interior heat loading (e.g., exposure to direct sunlight for long
periods of time; transmittance of sunlight through the windows) will work the air conditioning system harder and may
compromise the desired results. Accordingly, if the air conditioning system is to be used, park the motor home in a
shady location whenever possible and close drapes on those windows exposed to direct sunlight. Additionally, any
heat-producing sources (e.g., oven, unnecessary lights) within the motor home will work against the air conditioning
system; so strive to minimize their use.

The air conditioning system is the major consumption device of electrical power in the motor home. When this system
is being used in an RV park, cumulative use of these air-conditioning systems by the resident motor homes can create,
at times, a bigger demand for electrical power than is actually available. Accordingly, at such times a “brown-out”
condition may arise—this is when the AC voltage normally available drops to a lesser value (e.g., 10-20% below normal
or more).

“Brown-out” conditions cause appliances to draw greater currents to make up for the reduced voltage; thereby causing
circuit breakers to trip or fuses to blow. Under such conditions, your own motor home is not at fault; simply reset your
breakers and/or replace your fuses. Should such conditions continue, one may wish to turn reduce the electrical load (in
this case, turn “off” the air conditioning system for awhile) or start the electrical generator.

To cool the motor home, the thermostat inside the Allegro Bus is used—this is the
same thermostat which controls the furnace functions (described earlier). The air­conditioned, cooled air is emitted through the vents which are located in the roof
throughout the entire coach. The discharge and return air vents run parallel, front to
back, on the ceiling. Note that the return vents are similar to the air conditioning
vents. This system allows even distribution for the returns instead of forcing an excess
amount of return air through two smaller openings. The even return system takes
more of the hot air from the motor home, thereby providing cooler air throughout the

unit. The air conditioning vents that are mounted on the ceiling are round vent filters
(Figure 3-5) that need to be periodically checked for dust accumulation. When
dust has accumulated on the filters, remove them and wash in a mild detergent
and warm water.

Thermostatic Controls

The following is a brief overview of how best to use the thermostat (Figure 3-6).
For more detailed instructions, please consult the thermostat literature in the Owner’s
Information Package.

1. Move power switch to ON.

2. Depress the MODE button to select function. (COOL*, FURNACE, FAN ONLY, etc.)

Figure 3-6. Thermostat

Figure 3-5. Round Vent/Filter

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3. Depress the FAN button to select fan speed or automatic operation.

4. Depress the UP or DOWN button to set your desired temperature for the zone.

5. If your vehicle contains more than one ZONE, depress the ZONE button to select Zone 2, and repeat procedures
from Step 2 above. Repeat procedure for each additional zone.

6. If your vehicle has two roof top air conditioners utilizing a 50 amp power cord, some restrictions may apply.
When only 30 amps are available, you most likely will have to turn off one of the two
air conditioners to prevent tripping the circuit breaker. Refer to Step 5, then Step 2, for shutting
off the air conditioner in your selected zone.

NOTE: There is an approximate 2-minute time delay after selecting cooling function for refrigerant
compressor to start.

NOTE: If the Comfort Control is turned “off” or the thermostat loses power (i.e., power failure), the
air-conditioning system will resume operation at the last settings programmed into it when electrical
power is restored.

Liquid Propane (LP) Tank

The Allegro Bus is equipped with an ASME (American Society of Mechanical Engineers)-approved LP tank (Figure 3-7)
which is equipped with an automatic pressure regulator. This tank contains liquid propane fuel under high pressure. As

this fuel passes through the main valve and through the regulator, it is converted into
a gas and its pressure is reduced to a safe level for use within the motor home. A LP
gas-distribution system distributes the gas to those appliances using such in the motor
home. The “heart” of this LP gas distribution system is the regulator and that
regulator should only be adjusted by a qualified service technician. Most of the
problems encountered in lighting the pilots of these appliances are caused by
regulator misadjustments.

The major component of the LP gas supply is a manifold pipe which runs lengthwise
underneath the motor home floor. From this manifold, the various gas appliances are

connected by copper tubing with flared fittings so that connections and
disconnections can readily be made, as needed. Should any of the secondary tubing develop a leak, either on the
tubing proper or at the fittings, do not attempt to splice any of these lines. Instead, have a qualified service technician
run a new length of tubing to the appliance of concern and then have that line leak-tested before placing it in normal
operation.

To remove, repair, or replace any gas-operated appliance; always close the main gas valve at the LP tank—this measure
will provide an additional element of safety to prevent gas leakage and possible, subsequent explosion hazards.
However, if a gas leak is noted or suspected, turn “off” the main valve and keep the LP gas system “off” until that
system is inspected by a qualified service technician as soon as possible.

Do not delay in addressing any possible gas leaks with appropriate service because of the inherent hazards
to safety.

Figure 3-7. Liquid Propane Tank

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LP Tank Filling Practices

Any LP gas tank associated with the motor home should never be filled to more than 80% of total
capacity; filling should always be done only when the motor home is leveled. If the motor home is not
level, the tank may be overfilled (i.e., more than 80% of capacity) and, thus, subject the motor home to
possible fire or explosion from resultant uncontrolled gas flows.

LP Gas Regulator

As noted earlier, the LP gas regulator (Figure 3-8) is the “heart” of the LP gas
distribution system. This regulator reduces and controls the pressure of the gas on
the outlet end to provide a constant supply of gas at a constant pressure to the gas­operated appliances.

The regulator has a vent to relieve excess pressure on the inlet side of the
regulator, should excess pressure develop in the gas tank and connecting gas line
to that regulator inlet. The vent would normally release the excess LP gas to the

atmosphere until the overpressurization condition is eliminated.

This vent should be regularly checked to assure that it is not clogged or obstructed. If that vent is
blocked from normal operation, component or system failures may result. If periodic visual inspection
indicates any sign of corrosion or degradation, contact a qualified service technician to repair the
regulator as soon as possible; DO NOT operate the LP gas system with any faulty component in place.

Occasionally, the inherent moisture in the LP gas can cause a freeze-up of the regulator when the gas
passes through the regulator. The regulator reduces the high pressure of the gas on its inlet side to a
reduced pressure on its outlet side by permitting a controlled expansion of the gas through the
regulator—this gas expansion necessarily cools the gas (by means of the Joule-Thompson effect) and, if
cooled enough, may cause any moisture content to freeze.

Figure 3-8. LP Gas Regulator

Caution

When the motor home is not being used, the main LP gas valve must be turned

“off.” Also, turn “off” the main valve when the LP gas tank is to be refueled to avoid

the possibility of ignition fuel fumes by the pilot lights. All gas valves on the gas-

operated appliances with Direct Spark Ignition (DSI) should also be in the “off”

position during refueling and/or maintenance operations. DO NOT store LP, motor

fuel, propane, butane, or other flammable liquids inside the motor home as these

represent a very real fire hazard and possible threat to life.