ITR OASIS NE Operating Manual

OASIS® NE Heating

System

Installation and

Operating Manual

Diesel and AC Heating System

for Recreational Vehicles and Yachts

CAN/CSA-C22.2 No.110-94 (R2014)

CSA B140.10-06 (R2015), CSA B140.0-03 (R2013)

UL307A (Edition 8), UL174 (Edition 11)

Copyright © September 2016

International Thermal Research

IN CANADA: IN THE UNITED STATES:

2431 Simpson Road 11915 NE 56th Circle Suite B

Richmond, BC, Canada V6X 2R2 Vancouver, WA, USA 98682

Tel: [phone] or 604-278-1272 Tel: [phone] or 360-993-4877

Fax: [phone] Fax: [phone]

Email: [e-mail]

Website: http://www.itrheat.com

All rights reserved. No part of this manual may be reproduced or
transmitted in any form by any means, electronic or mechanical,
including photocopying and recording, information storage,
retrieval, or transmission, without permission in writing from
International Thermal Research

Right to Modify:

Due to our commitment for quality and ongoing product
improvement, ITR reserves the right to modify or change
without notice, any materials, applications, equipment,
accessories, and/or prices. All measurements and weights are
approximate.

Table of Contents

Table of Contents

Section 1, Overview .................................................. 1-1

1.1 Unpacking the Oasis® NE Heating System ........ 1-2

1.2 Protect Your Warranty .................................... 1-2

1.3 Oasis® NE Heating System Features ................ 1-3

1.4 Critical Factors .............................................. 1-5

1.5 Equipment, Tools and Skills ............................ 1-6

1.6 Testing and Inspection ................................... 1-7

Section 2, Mounting the Oasis® NE Heating System ... 2-1

2.1 Before You Begin ........................................... 2-1

2.2 Identifying Your Oasis® NE Heating System

Model ....................................................... 2-2

2.3 Your Mounting Location .................................. 2-2

2.4 What NOT to Do ............................................ 2-4

2.5 Oasis® NE Mounting Procedure ........................ 2-4

2.6 Zone Control Board Mounting Procedure........... 2-5

2.7 Remote Operating Panel Mounting Procedure .... 2-6

Section 3, Installing the Exhaust System .................. 3-1

3.1 Before You Begin ........................................... 3-1

3.2 Mounting Location ......................................... 3-1

Recommended Exhaust Outlet Locations .................. 3-1

Recommendation for Installation ............................ 3-2

What NOT to Do ................................................... 3-4

3.3 Procedure ..................................................... 3-4

Section 4, Installing the Fuel System ........................ 4-1

Recommendations for Installation ........................... 4-1

iv Draft: Oct 15/03 Installation Manual for RV Heater System

4.1 Before You Begin ........................................... 4-1

4.2 Fuel System Installation ................................. 4-1

4.3 What NOT to Do ............................................ 4-2

4.4 Procedure ..................................................... 4-3

Table of Contents

Section 5, Installing Fan Heaters ............................... 5-1

5.1 Before You Begin .......................................... 5-1

5.2 Fan System Operation ................................... 5-2

Features .............................................................. 5-2

Multiple Zone Heating ........................................... 5-3

Accessories and Components Needed ...................... 5-3

5.3 What NOT to Do ........................................... 5-4

5.4 Mounting Locations ....................................... 5-4

5.5 Procedure .................................................... 5-5

Section 6, Wiring the Electrical System ..................... 6-1

6.1 Before You Begin .......................................... 6-1

6.2 Oasis® NE 12 VDC......................................... 6-2

6.3 Oasis® NE 120 VAC ....................................... 6-3

6.4 Wiring The Zone Control Board ....................... 6-4

Cabin Fan Leads ........................................... 6-4

Thermostat Leads ......................................... 6-5

6.5 What NOT to Do ........................................... 6-5

Section 7, Plumbing the System ................................ 7-1

7.1 Before You Begin .......................................... 7-1

7.2 Coolant Plumbing Installation ......................... 7-2

7.3 What NOT to Do ........................................... 7-4

7.4 Coolant Plumbing Installation Procedure .......... 7-5

7.5 Potable Water Plumbing Installation ................ 7-6

7.6 Engine Plumbing Installation .......................... 7-7

7.7 Procedure For Filling/Purging The Oasis® NE

Heating System ........................................... 7-8

International Thermal Research Ltd. Draft: Oct 15/03 v

Table of Contents

Section 8, Operating the Oasis® NE Heating System .. 8-1

8.1 Features of your Oasis® NE Heating System ..... 8-1

8.2 Operating Instructions for the

Oasis® NE Heating System ............................. 8-3

8.3 Turning the Power to the

Oasis® NE Heating System ON ........................ 8-4

8.4 Activating the Burner (Primary)
and AC Heat (Supplemental) from the

Remote Operating Panel ................................. 8-5

8.5 Activating the Cabin Fan Heaters

through the Thermostats ................................ 8-6

8.6 Activating the Potable Hot Water ..................... 8-6

8.7 Potable Water Temperature Adjustment ........... 8-7

8.8 Activating the Engine Heat & Pre-heat ............. 8-8

8.9 Functions of the Remote Operating Panel ......... 8-9

8.10 Functions of the Oasis® NE Control Panel ........ 8-11

8.11 Functions of the Zone Control Board .............. 8-12

8.12 Potable Water and Space Heating Priority ....... 8-14

8.13 Maintenance ............................................... 8-15

8.14 Protecting the Heating System ...................... 8-16

8.15 General Troubleshooting .............................. 8-17

Warranty Information & Warranty Card

vi Draft: Oct 15/03 Installation Manual for RV Heater System

Table of Contents

List of Figures

Figure 1-1 Oasis® NE Heating System ........................ 1-1

Figure 1-2 Oasis® NE Heating System Overview .......... 1-5

Figure 2-1 Oasis NE Heating Dimensions .................... 2-3

Figure 2-2 Oasis NE Mounting Brackets ...................... 2-5

Figure 2-3 Zone Control Board .................................. 2-6

Figure 2-4 Remote Operating Panel Mounting .............. 2-6

Figure 3-1 Installing the Exhaust System

(Bottom Exhaust) ..................................... 3-6

Figure 3-2 The Exhaust Hole Location & Mounting

Template ................................................ 3-7

Figure 3-3 The Exhaust Goose neck Configuration ........ 3-7

Figure 5-1 Wiring the Fan’s Aquastat .......................... 5-2

Figure 5-2 Mounting a Low Profile Cabin Fan ............... 5-6

Figure 5-3 Installing a Relay for Add’l Fan Amperage ... 5-6

Figure 6-1 System Wiring ......................................... 6-2

Figure 7-1 Oasis® NE Overview ................................. 7-3

Figure 7-2 Plumbing Oasis® NE For 5 Zones ................ 7-3

Figure 7-3 Three Approved Methods of Installing
Heater Hose (consult ITR for alternative

methods and products) ............................. 7-6

Figure 7-4 Potable Hot Water System Plumbing ........... 7-7

Figure 7-5 Engine Heat / Pre-heat System Plumbing .... 7-8

Figure 7-6 Filling/ Purging Oasis® NE Heating System

Engine Heat / Pre-heat System Plumbing .... 7-9

Figure 8-1 Oasis® NE Heating System Overview .......... 8-3

Figure 8-2 Oasis® NE Main Control Panel .................... 8-4

Figure 8-3 Mixing valve location ................................ 8-7

Figure 8-4 Remote Operating Panel ........................... 8-9

Figure 8-5 Zone Control Board ................................ 8-13

Figure 8-6 Zone Control Board Proority Jumper ......... 8-14

International Thermal Research Ltd. Draft: Oct 15/03 vii

Overview

Section

1

NOTICE

Thank you for purchasing the Oasis® NE Heating System for
recreational vehicles and yachts (for use on vessels over 65 feet in
length).

The Oasis® NE Heating System is CSA/UL certified only for
installation into Recreational Vehicles, Manufactured Homes,
and Mobile housing.

This section covers critical information you need to know before
beginning the installation including how to protect your Warranty,
and tools and equipment needed.

Figure 1-1: Oasis® NE heating system

International Thermal Research 1-1

Section 1, Overview

1

Unpack it carefully.

2

Check each component against the shipping list to ensure that
you have everything and that all parts arrived undamaged.

3

If you discover any missing or defective parts call ITR
immediately.

4

If you are not installing the Oasis® NE Heating System right
away, secure all components so none will be misplaced.

5

Before installing the Oasis® NE Heating System read the
rest of this Installation and Operating Manual. It contains
critical information for a proper installation.

1.1 Unpacking the Oasis® NE Heating
System

When you receive the Oasis® NE Heating System:

A properly installed Oasis® NE Heating System is essential for
several reasons:

 To ensure that you and/or your customers receive satisfactory

results and enjoy a warm, comfortable environment.

 To ensure a trouble-free installation, a successful inspection and

testing process, and ease of future maintenance.

 To protect your Warranty.

1.2 Protect Your Warranty

This document reflects approved installation techniques, methods,
and materials, and applies only to ITR equipment. The Oasis® NE
Heating System is only guaranteed by ITR if the entire system has
been installed according to the requirements and recommendations
set out here.

This includes:

 Deviations from the instructions in this Manual.
 Changes to any piece of ITR-supplied equipment.
 Substitution of a non-ITR approved component.

1-2 The Oasis® NE Heating System

Section 1, Overview

• Efficient

• Clean

• Quiet

• Compact

• Safe

• Rugged

• Reliable

• Economical

No Warranty will be extended to improper installations. Use of any
unapproved materials, equipment or installation procedures will
result in a voided warranty for the entire heating system. Any loss
of service or damage as a result of any unapproved modification is
the responsibility of the installer. ITR accepts no liability for any
damage or loss of service resulting from unapproved modifications.

1.3 Oasis® NE Heating System Features

The Oasis® NE Heating System uses a 50,000 BTU (true output)
diesel burner (12 VDC) controlled by a multi-functional electronic
controller as the primary source of heating coolant fluid (anti-freeze
and water). Two 1500 Watt, 120 VAC immersion elements are used
as secondary heat sources to provide an additional 10,000 BTU of
heat. The Oasis® NE Heating System heats the coolant fluid to

provide a source of heat for all hydronic space heating needs.
Through the use of its integral distribution pumps, the Oasis® NE
Heating System has the ability to circulate the coolant fluid to all
space heating areas. It can also provide a supply of domestic hot
water using the integral heat exchanger. The Oasis® also
incorporates engine heat and preheat functions. (see Figure 1-2:
Oasis® NE Heating System).

Other features of the Oasis® NE Heating System include:

 Built in distribution pumps and heat exchangers for heating

multiple zones and also producing domestic hot water. Heat
exchanger also allows engine pre-heating (optional) as well as
using engine waste heat. The Zone Board Controls up to five
space heating zones.

 Support for potable hot water demand. The mixing valve is

factory set to limit the maximum temperature of the heated
potable water to 120ºF (49°C) with a total hot water demand of

1.5 GPM or less, and an incoming water temperature of 55ºF
(13ºC) or higher.

 Easy to install and field serviceable with system hookups and

connections easily accessible from the top of the heater.

 Easy to fill and purge zero pressure system.

International Thermal Research 1-3

 Easy to drain.

Section 1, Overview

 A high-temperature, stainless steel burner and stainless steel

jacket.

 7.5 US gallon, welded, insulated stainless steel coolant tank that

minimizes heat loss and optimizes heat recovery.

 Domestic water flow switch for quick response to domestic hot

water demand.

 Low coolant level switch.
 Quiet operation and low power consumption.
 Low pressure fuel system with built-in fuel pump.
 Fuel efficient burner capable of burning a wide variety of diesel-

based fuels (CSA/UL certified for diesel #1 and #2).

 Exhaust has minimal smoke and smell.
 Fan assisted sealed combustion chamber is designed to use

outside combustion air.

 Low amperage draw ignition.
 Electronically-controlled system featuring:

 automatic Safety Shutdown;
 manual-resettable aquastats for safety overheat protection.
 LED indicators on the Control Panel for diagnostics.
 Patented, proprietary flame sensor.

 Remote Operating Panel with ON/OFF switch for the diesel

burner, AC elements, and engine pre-heat, if installed.

 Control Panel with buttons for Power, Bypass, Reset, and

indicator LED’s for operational and diagnostic information.

1-4 The Oasis® NE Heating System

Section 1, Overview

Pay attention to the

notices of “Danger”
“Warning” “Caution”
and “Notice” in this

manual.

Figure 1-2: Oasis® NE Heating System Overview

1.4 Critical Factors

THE INSTALLATION SHALL BE IN ACCORDANCE WITH THE
REGULATIONS OF AUTHORITIES HAVING JURISDICTION

The key factors to keep in mind when planning and carrying out the
installation are:

 Mounting location restrictions for the Oasis

and exhaust outlet (to reduce noise, vibration, heat loss, etc.).

 Length, routing and sizing of fluid lines, air-flow tubing, exhaust

piping and wiring.

 Unrestricted vent required to draw in 100% outside air for

combustion.

®

NE Heating System

 Ability for technician to easily access and service the product,

especially fuel, plumbing, and electrical systems.

 After installation, ability to purge water and fuel lines and

inspect/test entire system using the ITR-supplied Inspection
Check Sheet.

International Thermal Research 1-5

Section 1, Overview

1.5 Equipment, Tools and Skills

As the user and/or installer, you must be qualified and authorized to
do the installation, which requires mechanical aptitude and electrical
knowledge. Make sure you comply with existing RVIA or ABYC (for
yachts) industry practices, using the highest and most recent
standards and codes. Good workmanship is essential. Please refer
back to Section 1 – Overview, sub-Section 1.2, Protect Your
Warranty.

You will need the following equipment and tools to install the
heating system (not supplied). This list does not include optional
equipment and accessories:

 Standard tools normally available in a well-equipped shop.
 Approved fasteners for mounting the heater unit.
 Steel (or stainless steel) 2” ID exhaust system piping, maximum

12’ with no bends. (See Section 3 – Installing the Exhaust
System, for details when bends are present.).

 Exhaust collar.
 ITR-muffler with straight-through design.
 2" air intake collar for connecting fresh outside air
 2" air intake hose for connecting to fresh air intakes of the Oasis

NE.

 1/4” supply fuel line, approved rubber or copper.
 #10 sheet metal screws or wood screws to mount fan units

inside the occupied areas.

 Heater hose (to connect Oasis NE hose fittings to interior fans).
 Potable water hose/PEX to connect the Oasis NE-S potable water

hose/PEX fittings to the domestic water system.

 Overflow tank to connect to the Oasis

clear plastic 5/8” hose; tank must be made of heavy-duty
plastic, vented with a screw-down cap, have an overflow outlet,
and sturdy enough to mount firmly to a vertical surface.

1-6 The Oasis® NE Heating System

®

Heating Module with

Section 1, Overview

 Up to five (5) thermostats (DC compatible) to allow temperature

regulation of the heating zones.

1.6 Testing and Inspection

After all components have been properly installed according to
standard practices, RVIA or ABYC (for yachts) standards, and the
recommendations of this Installation and Operating Manual, the
Oasis® NE Heating System should be test-operated for inspection
purposes.

For your convenience, you can use the pullout Inspection Check
Sheet in this Manual. The Inspection Check Sheet is divided into
progressive sections, allowing each phase of the inspection to be
carried out systematically, and then signed off by authorized
persons.

International Thermal Research 1-7

Mounting – Oasis® NE Heating

Section

2

System

2.1 Before You Begin

Plan the location of the Oasis® NE Heating System and all its major
components in advance to ensure the chosen locations are
compatible with installation requirements and within the technical
specifications.

Consider the following factors to help you decide exactly where
best to mount the Oasis® NE Heating System:

 Oasis
 Ventilation requirements.
 Exhaust outlet location and maximum acceptable length,

 Thru hull location and waterline (yachts). Refer to section

 Potential for vibration and jarring.
 Length of run from fuel source to heater. Refer to section

 Most efficient plumbing runs.
 Safe and convenient access for maintenance.
 Number and location of interior fans.
 Location of other equipment to be installed or connected to

®

NE Heating System weight when full (174 lbs).

including all 90 degree bends. Refer to section 3.2.

3.2.

4.2.

the Oasis® NE Heating System, including the Zone Control
Box, heat exchangers, overflow tank, batteries, etc.

International Thermal Research 2-1

Section 2, Mounting the Oasis® NE Heating System

 WARNING

Make sure you are familiar with Section 1 – Overview of this

Manual. If the system is not installed according to specifications
and with the correct equipment, your Oasis® NE Heating System
may not operate properly, safety may be compromised, and your
Warranty may be voided.

2.2 Identifying Your Oasis® NE Heating

System Model

As the owner, you must be fully aware of the controls and
operating features particular to your model of the Oasis® NE
Heating System. This is essential for the proper functioning and
life of your Oasis® NE Heating System as well as protecting your
warranty. Your model can be identified by locating the serial
number label on the outside case of the Oasis® NE Heating
System. The serial number identifies the model type through the
first series of letters and numbers.

2.3 Your Mounting Location

Your mounting location should consider the following:

 Mounting location must be able to support double the gross

weight of the Oasis® NE Heating System (i.e. 174 lbs. x 2 =
348lbs./79.0 KG x 2 = 158 KG) and must be of a non­combustible and non absorptive surface.

 Oasis

 Oasis

 Combustion air must be drawn from an outside source and

®

NE Heating System is 12.3”H x 18.8”W x 29.7” D.
(31.25 cm x 47.75 cm x 75.4 cm), see Figure 2-1: Oasis NE
Dimensions.

®

NE Heating System must be installed in a compartment
which is completely isolated from the atmosphere of living
spaces.

cannot contain any combustible gases.

2-2 The Oasis® NE Heating System

Section 2, Mounting the Oasis® NE Heating System

 Mount the unit with the front panel facing out and accessible.

This mounting position simplifies installation and maintenance.
Leave the left side of the unit accessible for maintenance.

 The Oasis

®

NE Heating System must be mounted in an area
that provides unrestricted access to the front and left side
panels. Allow space for connection to the fuel, coolant, and
potable water lines, as well as the power, exhaust, and air
intake connections. The following are the minimum required
clearances: 8” top clearance, 12" front clearance, 12" left side
clearance; 0” clearance to all other Oasis® NE Heating System
surfaces. Allow 1” clearance on the right side for attaching the
mounting brackets.

 Oasis

®

NE Heating System must be mounted horizontal and
level using eight, 1/4” through bolts and 1” diameter fender
washers, lock washers and nuts.

Figure 2-1: Oasis NE Dimensions

International Thermal Research 2-3

Section 2, Mounting the Oasis® NE Heating System

! DANGER

! WARNING

! DANGER

Oasis® NE Heating System must not be installed or operated in any
compartment with flammable gases.

If the Oasis® NE Heating System is going to be mounted in the
engine compartment, check for adequate ventilation. When the
engine is running this area could be under a negative pressure.
Make sure the air-intake hose and exhaust pipe have no leaks and
are well fastened to the heater, muffler and thru-hull fitting.
Assembly parts that may cause injury through accidental contact
should be protected.

This is a direct vent system. The combustion air must be drawn
directly from the outside, without coming in contact with air that
can infiltrate the living areas. See section 3.3.

 It is recommended that a catchpan be placed under the Oasis

NE-S Heating System to contain any unexpected leak.

 Choose a sturdy surface in a location that won’t be unduly

affected by vibration and jarring from rough roads or rough
seas.

 Ensure that the exhaust tubing can be properly and safely

routed to the outside. The maximum exhaust run for the
system is 12’, including 90 degree bends. See section 3.2.

®

2.4 What NOT to Do

 Don’t mount the Oasis

coach or yacht underneath the sleeping area. The sound of the
Oasis® NE Heating System cycling on and off may disturb light
sleepers.

®

NE Heating System in the rear of the

2.5 Oasis® NE Mounting Procedure

After choosing the mounting location for the Oasis® NE Heating
System, mount the unit and ensure it is level. Secure the Oasis®
NE Heating System in place (against the wall, floor or a mounting

platform) using four (4) mounting brackets, eight (8) x 1/4”

2-4 The Oasis® NE Heating System

Section 2, Mounting the Oasis® NE Heating System

through bolts (or wood screws), and 1” diameter fender washers,
lock washers, and nuts. (See Figure 2-2: Oasis NE Mounting
Brackets.).

Figure 2-2: Oasis NE Mounting Brackets

2.6 Zone Control Board Mounting
Procedure

 Mount the Zone Control Box (containing the Zone Control

Board) vertically, close to the Oasis® NE. Allow sufficient room
to access the internal fuses as well as to view the display LED’s
on the front of the board.

 Mount the bracket against a wall using 2 flat head screws. The

distribution module zone box will then click onto the bracket.
See Figure 2-3.

International Thermal Research 2-5

Section 2, Mounting the Oasis® NE Heating System

Figure 2-3: Zone Control Board

2.7 Remote Operating Panel Mounting
Procedure

The Remote Operating Panel is mounted inside the Coach or Yacht,
in an easy to access location. An opening for the remote panel
must be cut in the wall or mounting panel. The Remote Operating
Panel will be screwed in place using the 4 mounting holes.

Figure 2-4: Remote Operating Panel Mounting

2-6 The Oasis® NE Heating System

Installing the Exhaust System

Section

3

 DANGER

3.1 Before You Begin

For efficient and safe operation of the Oasis® NE Heating System
follow all recommendations for properly installing the exhaust. Any
deviations from these must be approved in advance by ITR.

Although the heater’s exhaust produces very low carbon monoxide
emissions, caution is still advised:

 Do not operate the Oasis

area unless there is adequate ventilation.

 This is a direct vent system. The combustion air must be

drawn directly from the outside, without coming in contact
with air that can infiltrate the living areas. See section 3.3.

Never place any exhaust parts close to combustible material or
through a combustible wall or ceiling without fireproof protection.
The exhaust can reach high temperatures.

®

NE Heating System in an enclosed

3.2 Mounting Location

If you can’t meet the technical specifications for mounting
the exhaust, don’t use the Oasis® NE Heating System. The

unit may perform poorly or become damaged if not installed
according to specifications.

Recommended Exhaust Outlet Locations

The following is recommended for a coach exhaust outlet location:

 Mount the exhaust outlet outside the coach, not inside the

International Thermal Research 3-1

heater compartment. Otherwise, exhaust fumes could
infiltrate the coach from the Oasis® NE Heating System.

Section 3, Installing the Exhaust System

 When mounting the Oasis

®

NE Heating System in a coach,
the typical mounting location for the exhaust outlet is under
the floor of the heater compartment and out from the side of
the coach, or out from the other side of the coach, directly
across from the heater. The Oasis® NE Heating System will
allow a maximum of 12' of exhaust piping, without any bends
(excluding the exit bend from the heater).

 Position the outlet of the exhaust pipe so that the exhaust

exits out from under the side of the coach, not directly
underneath the coach or under an opening window or vent.

 If the exhaust is mounted under a slide-out, the outlet of the

exhaust must be a minimum of 36" (inches) below the slide­out, including skirt and moldings.

In a yacht installation, the following is recommended for the exhaust
outlet location:

 Mount the exhaust thru hull so that the exhaust fumes cannot

enter or re-infiltrate any living areas.

 Make sure that the thru hull is at least 30” above the water

line with a goose neck rise on the exhaust to help eliminate
water from entering the Oasis® NE-S through the exhaust. If
the dual exhaust air-intake thru hull is used, ensure that the
air-intake is placed between 10 o’clock and 2 o’clock and also
goose-necked to avoid water ingestion, see Figure 3-3: The
Exhaust Goose Neck Configuration.

 There needs to be a 1/8" air gap around the exhaust thru hull.

The standard thru hull is 4" in diameter. The hole for the
fitting should be 4-1/4". Make sure that the holes for the
mounting screws have enough material left to hold the screws
firmly. The fitting must be centered in the hole.

Recommendation for Installation

The following applies to both a coach and yacht:

 You may use sweeping bends, but each 90° bend is

equivalent to two feet of exhaust piping. For example, if you
use two 90° bends, you must subtract 2' per bend from the
maximum allowed 12' exhaust length. Therefore, you will be
restricted to 8' of straight exhaust piping plus the two bends.
Do not exceed these recommendations.

3-2 The Oasis® NE Heating System

Section 3, Installing the Exhaust System

! DANGER

 The combustion air must be drawn from outside the coach or

yacht. The maximum length of each air-intake tubing is 7
feet. Do not exceed this recommendation.

 Use an ITR-manufactured muffler with a straight-through

design. No other muffler is acceptable.

 Exhaust outlet is on the bottom of the Oasis

®

NE Heating

System, towards the back.

The exhaust and outlet are HOT and the surrounding areas
must be thermally shielded and protected from the hot
surfaces and heat build-up by insulation. Nothing can come
into inadvertent contact with any part of the exhaust system.

 Exhaust must have a minimum of 3” (7.6 cm) clearance from

all surfaces.

 Ensure that the exhaust cannot be plugged or restricted.
 The exhaust fitting on the Oasis

®

NE Heating System is

2.0” O.D. and the exhaust pipe used must have a minimum of

2.0” I.D. throughout its length.

 All exhaust elbows must be of a large radius design.
 The exhaust run must be supported a minimum of every 3’ of

its installed length.

 The exhaust and Oasis

®

NE Heating System connection point
must use appropriate clamps and sealing compound to ensure
that the connections are tight and leak free. Make sure any
sealing used does not restrict the exhaust flow. The Oasis®
NE Heating System exhaust outlet pipe and the exhaust pipe
itself must not be distorted or damaged during this process.

 When the Oasis

®

NE-S Heating System is running the
connection points and the system must be checked for leaks
and any found must be corrected. Periodically, check the
exhaust fittings, connections, exhaust tube, and insulation for
leaks and integrity; make repairs or replacements if
necessary.

 Appropriate exhaust insulation must be used to cover the

entire length of any interior exhaust run.

International Thermal Research 3-3

Section 3, Installing the Exhaust System

1

Leave suitable air spacing to protect combustible
materials; use an exhaust collar and metal shields where
required.

2

Find an appropriate location for the exhaust hole of the
heater. (See Figure 3-2)

 Solid stainless steel exhaust tubing or approved exhaust

tubing is recommended but an approved stainless steel
flexible exhaust tubing can also be used. If flexible exhaust
tubing is used, the exhaust tubing must be inspected
regularly for leaks and deterioration as this type of exhaust
does not have the life expectancy of solid tubing. U-bolt
clamps are recommended for joining flex and solid tubing as
they apply firm, even pressure.

 In a coach, install an exhaust collar on the exhaust pipe to

isolate the pipe from the coach frame. This reduces vibration
and noise and protects the coach from the effects of high
exhaust temperature, see Figure 3-1: Installing the Exhaust
system (Bottom Exhaust).

What NOT to Do

Don’t mount the exhaust pipe inside the heater compartment.

Don’t use more than 8’ of exhaust pipe if 180° of total bends are

present, excluding the one bend at the outlet of the heater.

Don’t use any mufflers not supplied or approved by ITR.

Don’t use too much muffler cement or exhaust sealant that you

block the exhaust system.

Don’t over-tighten exhaust clamps or you may crush the Oasis® NE
Heating System’s exhaust outlet pipe.

3.3 Procedure

Figure 3-1: Installing the Exhaust System (Bottom Exhaust) shows
a standard setup for the down exhaust.

To install the exhaust system:

3-4 The Oasis® NE Heating System

Section 3, Installing the Exhaust System

3

Securely seal the exhaust piping to the Oasis® NE Heating
System fitting using an approved exhaust clamp.

4

Connect the exhaust piping in series with the muffler,
using heavy-duty exhaust clamps. If you use vibration
isolation mounts they must be high temperature.

5

Connect the flexible air-intake tubing (2” I.D.) to the air-
intake fitting on top of the heater. Use a #32 gear clamp
to attach the tubing to this fitting.

The other end of the air-intake hose can be installed in 2
configurations:

Installation of the air-intake adapters to the
underside of the RV

Locate a suitable location to mount the air-intake adapter.
Drill a 2” hole through the floor. Insert the adapter from
underneath and use 3 screws to secure it against floor.
The air entrance of the air-intake assembly shall be
guarded or shielded to exclude rain, snow and debris. Use
a #32 gear clamp to attach the air-intake tubing from the
heater to the adapter. Ensure the run of tubing is as short
as possible to facilitate air flow. See figure 3-1.

Installation of the air-intake adapter to the side of
the RV

Locate a suitable location to mount the air-intake adapter.
Drill a 2” hole through the side wall (minimum ¼”,

maximum 2” wall thickness). Insert the adapter and use 3

screws to mount it against the side wall. Use a #32 gear
clamp to attach the air-intake tubing from the heater to
the adapter. Ensure the run of tubing is as short as
possible to facilitate air flow. See figure 3-1.

6

Secure both ends of the air-intake tubing with properly
sized hose clamps to prevent air leaks.

7

Make sure the air-intake tubing and exhaust piping have
no leaks and are not touching each other.

8

Protect the air-intake entrance from water and dirt with a
guard or shield.

International Thermal Research 3-5

Section 3, Installing the Exhaust System

9

On a yacht, make sure the thru hull is at least 30” above
the waterline and the exhaust must be goose-necked, see
Figure 3-3: The Exhaust Goose Neck Configuration.

WARNING

This unit is not to be used with an air filter. The use of an air
filter can restrict the combustion air and result in improper
and unsafe operation.

Figure 3-1: Installing the Exhaust System (Bottom Exhaust)

3-6 The Oasis® NE Heating System

Section 3, Installing the Exhaust System

Figure 3-2: Exhaust Hole Location & Mounting Template

Figure 3-3: The Exhaust Goose Neck configuration

International Thermal Research 3-7

Installing the Fuel System

Section

4

! DANGER

! WARNING

4.1 Before You Begin

For efficient and safe operation of the Oasis® NE Heating System,
follow all recommendations for properly installing the fuel system.
Any deviations from these must be approved in advance by ITR.

Use only diesel #1 and #2 in the Oasis® NE-S Heating System. DO
NOT USE GASOLINE, CRANKCASE OIL, OR ANY OIL CONTAINING
GASOLINE.

Keep fuel lines away from any heat source above 100°F (38°C).

Keep gasoline and any equipment that uses gasoline away from the
Oasis® NE Heating System location. The Oasis® NE Heating System
is not rated for use in an explosive environment.

Never share the fuel supply to the Oasis® NE Heating System with
any other fuel-burning device.

4.2 Fuel System Installation

The fuel pump in the Oasis® NE Heating System has a maximum
flow capacity of 32 GAL/Hr and a maximum pressure of 11.5 psi. A
10 micron fuel filter is recommended. Select a fuel filter based on
these requirements.

Recommendations for Installation

The Oasis® NE Heating System’s fuel connections are accessed from
the top of the heater. The fuel inlet/outlet connections are located
on the top right of the Oasis® NE Heating System and consist of

1/8” NPT threaded female fittings. Minimum recommended size for
the fuel line is ¼” I.D. The fuel return line should return to the fuel

supply tank.

International Thermal Research 4-1

Section 4, Installing the Fuel System

NOTICE

! CAUTION

! CAUTION

The following is recommended for the fuel system installation:

The fuel supply from the fuel storage tank to the fuel inlet must be
from a dedicated fuel pickup on the top of the tank.

 The fuel supply line should be installed with minimal rise from

the fuel tank. The total rise from the bottom of the pickup
tube to the fuel inlet on the Oasis® NE should not exceed 60”.
There are no minimum clearance requirements between the
fuel tank and the Oasis® NE.

The fuel line must be routed and secured to prevent damage,
chafing and kinking during normal operation.

 All fuel line connection points and hoses must use suitable

clamps and/or sealant and must be checked for leaks on the
initial installation and also periodically as part of normal
maintenance.

 A primary, UL and/or CSA approved fuel oil filter (not

provided) must be installed inline on the fuel supply hose,
between the tank and the Oasis® NE, in a manner that
ensures easy access for maintenance. A secondary fuel filter
is mounted inside the Oasis® NE, just behind the fuel nozzle.
Both filters must be inspected and replaced as required as
part of normal maintenance.

 Fuel line hose used must be appropriate for your

requirements. It is strongly recommended that the hoses
have permanently installed end fittings.

4.3 What NOT to Do

 Don’t allow the fuel or the fuel lines to become contaminated

with foreign material.

 Don’t allow the fuel lines to become damaged or constricted.

Ensure that fuel lines are always protected from contamination by

foreign material. When installing or servicing, seal off ends to
prevent contamination. After installing, you may also wish to flush
the fuel line to rid of it air and any foreign material.

4-2 The Oasis® NE Heating System

Section 4, Installing the Fuel System

1

Install an inline fuel filter. The optimal location is on a
compartment wall next to the Oasis® NE, inline between
the fuel tank and the Oasis® NE.

2

Connect the fuel line to the dedicated fitting on the main
diesel fuel tank.

3

Inspect the supply fuel line for any loose connections or
damage. Fittings must be airtight.

4

If desired, install a shut-off valve on the tank side of the
fuel filter to allow shutdown and filter service.

4.4 Procedure

To complete the fuel system installation:

International Thermal Research 4-3

Installing Fan Heaters

Section

5

NOTICE

5.1 Before You Begin

ITR makes a variety of 12 VDC fan heaters for individual
cabins or areas:

The Small Space Cabin Fan (6095) draws 0.5 Amps and has
an output of 4000 BTU/h.

The Low Profile Cabin Fan (6094) draws 1 Amp and has an
output of 6000 BTU/h.

The Standard Cabin Fan (6002) draws 0.9 Amps and has an
output of 8700 BTU/h.

The High Output Cabin Fan (6093) draws 1.6 Amps and has
an output of 12000 BTU/h.

The Defrost Heater draws 10 Amps and provides 20,000
BTU/h. It comes with a 3-speed switch to control the speed
of the fan.

International Thermal Research 5-1

For best results, the fans should be mounted as close to the
floor as possible. They have a built-in aquastat (optional),
which turns on the fan when the coolant running through it
reaches 120°F (49°C).

Note: A limited number of fan heaters can be used
with the Oasis® NE Heating System.

Only the installation of ITR fan heaters is covered in this
Manual.

If you are installing non-ITR fan heaters, you must obtain
prior approval from ITR. You must check the fans’ total
amperage draw to ensure they will be compatible with the
Zone Control Board, as well as flow capacity to ensure that
each fan meets system requirements.

Section 5, Installing Fan Heaters

5.2 Fan System Operation

ITR fans consist of a 12 VDC brushless fan and heater coil
similar to a radiator.

When the heater unit comes on, the fan draws ambient air
from the interior, blows it through the heater coil and back
into the interior through a vent. There must be an inlet and
outlet vent for each fan unit.

Features

 The Zone Control Board will not run the fans unless

the coolant inside the Oasis® NE tank is above 120F.
However, during the initial startup, the coolant in the
lines will be lower than 120F until it has had a chance
to mix with the coolant in the tank. ITR heater fans
can be supplied with a built-in aquastat, which
prevents fan operation until the system has reached
minimum operating temperature. Figure 5-1 shows
how to wire up the aquastat in a fan.

Figure 5-1: Wiring the Fan’s Aquastat

5-2 The Oasis® NE Heating System

 If a ―passive‖ radiant heat system is desired (i.e.

baseboard or fin and tube configurations), consult ITR
for recommended installation procedures and design.

Section 5, Installing Fan Heaters

Multiple Zone Heating

The Oasis® NE Heating System can supply heat up to five
interior zones.

Up to five thermostats (positive DC compatible) can be
installed to allow temperature regulation of the zones. The
thermostat controls the fan heater.

For larger installations, consult ITR.

Accessories and Components Needed

In addition to the fans themselves, you will need at least
some of the following optional accessories and equipment
which are not supplied but which can be purchased
separately.

 Thermostats — thermostats can be installed in the

interior. Digital or analog versions are available.

 Air Outlet Vents — covers that are installed flush

with the wall to vent heat for the installed heater unit.

 Fan Guards — to protect the fan blades from

damage, recommended for fans installed in storage
areas or other accessible areas where something could
contact the fan blades.

 Screws — #10 sheet metal screws or wood screws to

mount the fan units. See Figure 5-2: Mounting a
Spacesaver Fan.

 Two-Speed Fan Switches – to enable low and high-

speed settings from inside the coach or yacht; for use
with the ITR Cabin heater and Spacesaver fan.

 Three-Speed Fan Switches — to enable low,

medium and high-speed settings from inside the coach
or yacht; for use with the ITR defrost heater.

 Air Ducting — to allow you to install fans in a remote

location (i.e. not directly adjacent to the interior space
to be heated) and duct the heated air to its output
location. Also, air outlet plates to allow you to
install ducting for one, two or three separate outlets
(e.g. you can use one fan to heat two different areas
by installing a dual air outlet plate).

International Thermal Research 5-3

Section 5, Installing Fan Heaters

ITR can suggest
optimal fan locations
if you provide a floor
plan of your coach
or yacht.

5.3 What NOT to Do

 Don’t install more fans that require more heat than

the Oasis® NE can produce. Your system will not run
effectively. If you choose to use fans that draw higher
current (more than 10 amps on zone 1, or more than
5 amps on zones 2-5), install a relay to handle the
extra load; see Figure 5-3: Installing a Relay for
Additional Fan Amperage. See section 6.4 for
information on the Zone Control Board.

 Don’t mount the return air outlet too close to the

fan’s air intake source.

5.4 Mounting Locations

Carefully choose the mounting locations of your fans:

 Locate the fans to evenly heat the specific zone.
 Provision must be made to protect potable water lines

from freezing.

 Install fan at floor level or very near floor level, in order

to optimize circulation.

 Allow a minimum 16 square inch (100 cm sq.) opening in

the fan heaters’ mounting compartment to allow sufficient

intake of air.

ITR’s Cabin Fans (Low Profile Cabin Fan pictured at left) are
attached to a mounting plate. They are designed to mount
horizontally on a flat surface.

The thermostat should not be mounted on walls outside of
the zone because that could cause false temperature
readings. Mount on interior walls and bulkheads, away from
windows, heater vents and cabin fan heaters.

5-4 The Oasis® NE Heating System

Section 5, Installing Fan Heaters

1

Mount the fan using #10 sheet metal screws or wood
screws, see Figure 5-2: Mounting a Low Profile Cabin Fan.

2

If you are using ducting and a dual air outlet plate for any

fan, limit the total length of duct for both outlets to 36‖ for

optimum air output.

3

Select the appropriate mounting location for the
thermostat, as well as any fan speed switches. You will
wire these up to the Zone Control Board in Section 6 –
Wiring The Electrical System.

4

The Zone Control Board can control up to 5 zones. The
cabin fan 1 lead (orange) can supply up to a maximum of
10 Amps. The other cabin fan leads 2-5 can supply up to a
maximum of 5 Amps each. The total current draw is not to
exceed 18 Amps for all cabin fan leads.

5

If the system requires higher amperage draws, install a
separate relay to power the fans. This relay will use the
existing fan circuit as a signal and must be wired to a

secondary power source (not the heater’s control board).

See Figure 5-3: Installing a Relay for Additional Fan
Amperage.

6

To install plumbing lines to the fans, see Section 7 –
Plumbing the System.

5.5 Procedure

After choosing the appropriate mounting location and
configuration:

International Thermal Research 5-5

Section 5, Installing Fan Heaters

Figure 5-2: Mounting a Low Profile Cabin Fan

Figure 5-3: Installing a Relay for Additional Fan Amperage

5-6 The Oasis® NE Heating System

Wiring the Electrical System

Section

6

 WARNING

NOTICE

6.1 Before You Begin

The Oasis® NE and its electrical Control Board (mounted internally)
are pre-wired and have been thoroughly tested together as a unit.
To integrate the Oasis® NE into your system, wiring will be required
between the following system components:

 120VAC Power
 12VDC battery
 Oasis
 Oasis NE Remote Operating Panel
 Oasis NE Zone Control Board
 Thermostats
 Cabin Fans

To review the wiring for the Oasis® NE Heating System, refer to the
wiring diagram shown in Figure 6-1: System Wiring.

All electrical connections and wiring must comply with normally­accepted 12 VDC and 120 VAC wiring practices, local regulations,
and ABYC/RVIA standards. Only a qualified electrical installer
should complete the wiring. All field wiring is to be in accordance
with CSA Standard C22.1, Canadian Electrical Code Part l or the
National Electrical Code, ANSI/NFPA 70.

The main electronic Control Board is mounted onboard the Oasis®
NE itself. It has no user adjustable components.

®

NE Heater

International Thermal Research 6-1

Section 6, Wiring the Electrical System

Primary

12 pin

Oasis NE

Harness 2043-30 (5 feet)

Remote

Operating

Panel

Oasis NE Zone Board

10 pin

Harness 2041-80 (50 feet)

10 pin

10 pin

10 pin

8 pin

8 pin

14 pin

Zone Plug 2045-20

12 pin

Cabin Fan 1 (Orange)

9 pin

9 pin

RedRed

Black

Zone 1 Fan
Zone 2 Fan
Zone 3 Fan
Zone 4 Fan
Zone 5 Fan
Summer Loop

Heat Loop 1
Heat Loop 2
Engine Preheat

Power
Zone 1 Thermostat

Domestic Water

Zone 2 Thermostat
Zone 3 Thermostat
Zone 4 Thermostat
Zone 5 Thermostat

AC Box

110 VAC

Ground

Green

White

Black

White

Black

Black

110 VAC

Battery

_

+

Black

Master

Disconnect

25A

Fuse

20A Fuse

Battery

_

+

Cabin

Fans

Cabin Fan 4 (Blue)

Cabin Fan 2 (Gray)

Cabin Fan 3 (Brown)

Cabin Fan 5 (Light Blue)

Thermostats

Thermostat 1 (White)
Thermostat 2 (Yellow)
Thermostat 3 (Pink)
Thermostat 4 (Tan)

Thermostat 5 (Purple)

Bypass Switch

9 pin

Harness 2044-50 (5 feet)

9 pin

1 Amp

Fused From

Battery +ve

6.2 Oasis

The following apply to the 12 VDC connections of the Oasis® NE:

 There is one paired set of 12 VDC electrical connections on the

top left of the Oasis® NE. They consist of the primary DC
positive (red) and negative (black) connection and are 12 gauge
stranded copper wires.

6-2 The Oasis® NE Heating System

Figure 6-1: System Wiring

®

NE 12 VDC

Section 6, Wiring the Electrical System

 WARNING

Primary DC power should originate from a dedicated connection on
the house battery bank. A 20 amp fuse must be included close to
and inline from the battery to the positive (red) connection on the
Oasis® NE Heating System. The primary power wire gauge must be
sized to permit no more than a 3% voltage drop from the battery
to the Oasis® NE Heating System.

 The 12 VDC connections to the Oasis

®

NE must be connected
directly to the battery (through a fuse). There should be no
battery disconnect switch between the battery and the Oasis®
NE. This is to prevent the burner from being shut down without
first going through its appropriate purge period. Without a
proper purge period to cool the combustion chamber, the
internal components of the Oasis® NE will become damaged.
Note that the power to the Zone Control Board (see section 6.5)
can go through a battery disconnect switch.

 A properly-shielded power system is required for safe, trouble-

free operation.

6.3 Oasis® NE 120 VAC

 The Oasis

120 VAC (60 Hz) immersion elements. The connections for the
electrical supply are on the top left side of the Oasis® NE
Heating System, under a cover, labeled AC power.

 The power wires for the AC immersion elements are 14 gauge

stranded copper leads that use standard AC color code (black­hot, white–neutral, green-ground). These are to be connected
using standard 120 VAC electrical connectors and terminals.

®

NE Heating System is equipped with two 1500 watt,

 There are two sets of AC power wires, one set with black heat

shrink (primary) and one set without heat shrink (secondary).
Each individual set must be connected to a separate AC circuit
breaker. The primary set of wires is connected to the left AC
element, and the secondary set of wires is connected to the
right AC element, located inside the Oasis® NE Heating System.
If only one AC circuit breaker is available, you must connect to
the primary wire set only. Once the connections are completed,
the wires are to be inserted back into their compartment and
the cover secured.

 The ground wire (green) is shared between the two connections.

International Thermal Research 6-3

Section 6, Wiring the Electrical System

6.4 Wiring The Zone Control Board

 Primary 12 VDC power to the Zone Control Board should

originate after the master disconnect switch from a dedicated
connection on the house battery bank.

 A 25 amp fuse or breaker must be included inline from the

power source to the positive connection on the Zone Control
Board. The primary power wire gauge must be sized to
permit no more than a 3% voltage drop from the power
supply to the Zone Control Board.

 The Oasis

®

NE and the Remote Operating Panel are
connected to the Zone Control Board through the electrical
connections located at the bottom of the Zone Control Board.

 The Zone Control Board connects to the thermostats and

cabin fans through a 14 pin plug, with butt connect leads.

Cabin Fan leads

 The positive (red) lead from each cabin fan is to be attached

to one of the trailing cabin fan leads, color coded for zones,
from the thermostat and cabin fan connector plug.

 The negative lead from each cabin fan is to be attached to a

ground terminal (not provided) that is connected to a battery
ground.

 The cabin fan 1 leads (orange) can supply up to a maximum

of 10 Amps. The other cabin fan leads 2-5 can supply up to a
maximum of 5 Amps each. The total current draw is not to
exceed 18 Amps for all cabin fan leads.

 If the system requires higher amperage draws, install a

separate relay to power the fans. This relay will use the
existing fan circuit as a signal and must be wired to a

secondary power source (not the heater’s control board). See

Figure 5-3.

6-4 The Oasis® NE Heating System

Section 6, Wiring the Electrical System

NOTICE

Thermostat Leads

 The power lead to the thermostat should be fused (1 Amp)

and attached to a power terminal (not provided) that is
connected to the battery.

 The return lead from each thermostat is to be attached to

one of the trailing thermostat leads, color coded for zones,
from the thermostat and cabin fan 14 pin connector plug on
the zone control board.

 Note that the zone control board uses Heating Loop 1 to

supply coolant to Zones 1 and 2, and uses Heating Loop 2 to
supply coolant to Zones 3, 4, and 5. Zones 1 and 2 are
calling for heat, the zone control board will activate the Heat
Loop 1 pump. When Zones 3, 4, and 5 are calling for heat,
the zone control board will activate the Heat Loop 2 pump.

6.5 What NOT to Do

Never shut off the Oasis® NE Heating System power via an inline
battery or master switch while the system is running. Never
disconnect the battery when the Oasis® NE Heating System is
running, and never disconnect the battery while the inverter is
charging. Do not wire the Oasis® NE Heating System through a
disconnect that is used as a normal shut-down of the DC system.

Doing either will severely damage the Oasis® NE Heating System
because it fails to automatically purge the combustion chamber.
Such damage is detectable upon inspection and will not be covered
under warranty. Always shut the system off using the normal
system controls, after it has completed its purge and cooled down
the combustion chamber.

International Thermal Research 6-5

Plumbing the System

Section

7

 DANGER

When heat is called
for, the distribution
pumps in the NE send
heated fluid out to the
cabin fans and potable
water heat exchanger.

7.1 Before You Begin

For efficient and safe operation of the Oasis® NE Heating System,
follow all of the recommendations in this section for properly
installing the plumbing system. Any deviations from these must be
approved in advance by ITR.

The Oasis® NE Heating System must use a non-toxic, propylene
glycol based coolant with additives generally recognized as safe
”GRAS” by the FDA. Use of non-propylene glycol based coolant can
be harmful if contamination of potable water occurs due to a leak in
the heat exchanger, which could be caused if the fresh water in the
system is allowed to freeze.

For an efficient Oasis® NE Heating System operation, you must:

 Minimize heat loss from the Oasis
 Balance the heat output for each of the zones and balance the

heat drawn by both space heating loops. Balancing can be done
by adjusting the number and size of the cabin fans installed in
each loop in the Oasis® NE Heating System. Figure 7-2:
Plumbing Oasis® NE Heating System for Five Zones, shows a
typical plumbing layout for circulating coolant from the Oasis®
NE to the cabin fans in the two loops, and back to the Oasis® NE.

International Thermal Research 7-1

®

NE and hoses.

Section 7, Plumbing the System

NOTICE

! DANGER

7.2 Coolant Plumbing Installation

The plumbing installation should consider the following:

 The Oasis

®

NE has an overflow fitting located on the top of the
unit. Ensure a four (4) quart minimum overflow bottle is
attached to the overflow fitting. The connection point should be
from the bottom of the overflow bottle.

 The supply and return coolant plumbing connections are on the

top of the Oasis® NE Heating System. The supply fittings are
1/2" NPT (female) bulkhead fittings, and the return fittings are
1/2" NPT (male) fittings. The supply coolant outputs from the
Oasis® NE are labeled "Heating Loop 1 Supply" and "Heating
Loop 2 Supply". The return coolant inputs to the Oasis® NE are
connections labeled "Heating Loop 1 Return" and "Heating Loop
2 Return". Ensure proper direction of flow. Refer to Figure 7-1:
Oasis® NE Overview for the location of the fittings.

 Two 1/2" NPT to 3/4" hose barb fittings must be fitted into the

Oasis® NE coolant supply connections. Two 1/2" FPT to 3/4" hose
barb fittings must be fitted into the Oasis® NE coolant return
connections. All connections must be tightened to a leak free
condition using an appropriate thread sealant.

 Hose and/or tubing used to connect to the Oasis

®

NE supply and
return connections must be heavy duty heater hose, minimum
3/4” I.D, or 5/8” PEX.

All fittings (except Heat Loop 1 & 2 return fittings) on the Oasis® NE
require two wrenches when tightening. One wrench must be placed
on the bulkhead fitting and held in place to prevent this fitting from
being overstressed. The other wrench can be used to tighten the
matching half of the fitting onto it. Failure to follow this procedure
will damage the Oasis® NE and the fittings.

Do not operate the Oasis® NE Heating System until a proper
water/anti-freeze solution has been added to the Oasis® NE and the
heating system and all trapped air has been bled. An inadequate
mixture may cause system circulation problems and potential
Oasis® NE Heating System damage and/or personal injury. Use only
a non-toxic, propylene glycol based coolant with additives
recognized as safe “GRAS” by the FDA. Refer to the anti-freeze
manufacturer recommendations for instructions for your application.

7-2 The Oasis® NE Heating System

Section 7, Plumbing the System

Figure 7-1 Oasis® NE Overview

International Thermal Research 7-3

Figure 7-2: Plumbing Oasis

®

NE For 5 Zones

Section 7, Plumbing the System

NOTICE

 All plumbing lines must be routed and secured to prevent

damage, chafing and kinking.

 Ensure that the coolant flow is adequate through the Oasis

®

NE
Heating System. The flow rate through each of the space heating
loops should be at least 2.5 GPM. An indication of inadequate
flow is a large temperature difference between the first cabin fan
and the last cabin fan in each space heating loop (when the
Oasis® NE Heating System is running and up to normal operating
temperature). In a properly flowing system, each fan in the
space heating loop will have an outlet temperature that is only a
few degrees cooler than the preceding fan.

 The Oasis

®

NE should be filled and flushed prior to operation to

remove any foreign debris.

 Use heavy-duty heater hose or PEX tubing. Slip-on foam

insulation coverings may be used over the hose fittings to reduce
heat loss. Secure all hose connections with constant tension
spring clamps.

7.3 What NOT to Do

The Oasis® NE Heating System’s coolant distribution pumps are one
of the most critical parts of the system. Never let the pumps run
dry or damage will occur to the impellers. This is not covered under
warranty.

Don’t use low-quality heater hose.

Don’t let the hose come into contact with solvents, which may

cause it to soften and swell. If there is any risk that solvents may
contact the hose, insert it into PVC plastic tubing for protection.

7-4 The Oasis® NE Heating System

Section 7, Plumbing the System

1

Connect two 1/2" NPT to 3/4" hose barb fittings onto the
Oasis® NE coolant supply connections. Connect two 1/2" FPT
to 3/4" hose barb fittings onto the Oasis® NE coolant return
connections. Tighten all connections to a leak free condition
using an appropriate thread sealant.

2

Hose and/or tubing used to connect to the Oasis® NE supply
and return connections must be heavy duty heater hose,
minimum 3/4” I.D, or 5/8” PEX.

Install the cabin fans for both space heating loops by
connecting the supply line to the lower port on the cabin fan
and the outlet to the next fan in the series loop. Each cabin
fan heater should be plumbed so that fluid supply enters the
bottom of the heating core and exits from the top. This helps
keep air from being trapped in the cabin fan core. Ensure
proper direction of flow. Refer to Figure 7-1: Oasis® NE
Overview for the location of the fittings. Ensure there are no
kinks or sharp bends that might restrict the fluid flow. See

Figure 7-3: Three Approved Methods of Installing Heater Hose
(Consult ITR for Alternative Methods and Products) for

methods of attaching the heater hose.

3

Once the two space heating loops have been set up with the
cabin fans, connect the two individual space heating loop
supply lines to the "Heating Loop 1 Supply" and "Heating Loop
2 Supply" connections on the Oasis® NE. Connect the two space
heating return lines to the "Heating Loop 1 Return" and
"Heating Loop 2 Return" connections. Note that the zone control
board uses Heating Loop 1 to supply coolant to Zones 1 and 2,
and uses Heating Loop 2 to supply coolant to Zones 3, 4, and 5.

4

The Oasis® NE has an overflow fitting located on the top of the
unit. Ensure a four (4) quart minimum overflow bottle is
attached to the overflow fitting. The connection point should be
from the bottom of the overflow bottle.

7.4 Coolant Plumbing Installation

To install and connect the Oasis® NE and heater hose:

Procedure

International Thermal Research 7-5

Section 7, Plumbing the System

WARNING

Figure 7-3: Three Approved Methods of Installing Heater Hose
(consult ITR for alternative methods and products)

7.5 Potable Water Plumbing Installation

The Potable water connections are located on top of the Oasis® NE­S. The Cold water supply and Hot water outlet can be connected
using ½” NPT to PEX crimp fittings.

The maximum water supply pressure to the heater is 150 PSI (10
bar). The Hot water Outlet temperature is regulated by an internal
mixing valve factory set at 120F (49°C). If needed this valve can be
adjusted between a range of 95F (35°C) to a maximum of 145F
(63°C). A potable water drain is provided for winterizing purposes.
This will prevent damage to the internal heat exchanger due to
freezing water. See Figure 7-4: Potable Hot water system
plumbing.

All fittings, hose, tube and fitting sealant involving the potable water
must be food safe and approved for use with potable water and
rated for the potable water system pressure.

7-6 The Oasis® NE Heating System

Section 7, Plumbing the System

WARNING

Figure 7-4 Potable Hot Water System Plumbing

7.6 Engine Plumbing Installation

The Engine Heat Supply/Return connections are located on top left
(towards the back) of Oasis® NE. These connection points are 1/2"
hose. The connection can be made by placing PEX inserts into the
1/2" PEX hose, and sliding 1/2" PEX into the hose and clamping it in
place. Alternatively, a 1/2" barb to 1/2" or 3/4" barb fitting can be
used to make the connection to the engine coolant hose.

Hot coolant from the engine enters the Oasis® NE at the “Engine
Supply”. The “Engine Return” returns the coolant back to the
engine. This makes use of engine waste heat.

If the pre-heat function is installed, an additional pump is installed
(inside the Oasis® NE) to move the engine coolant through the
engine heat exchanger, when the engine is turned OFF. The pre­heat switch on the Remote Operating Panel will activate this pump.
See Figure 7-5: Engine heat/pre-heat system plumbing.

It is recommended to contact the vehicle/engine manufacturer prior
to proceeding with the engine plumbing installation.

Prior to operating the engine pre-heat pump, the engine coolant
loop must be connected to the Oasis® NE and the coolant line
purged of air. The power to the engine pre-heat pump is left
disconnected at the factory. Once the engine coolant loop has been
purged, the side cover of the Oasis® NE must be removed and the
power to the engine pre-heat pump must be connected.

International Thermal Research 7-7

Section 7, Plumbing the System

1

Do not operate the Oasis® NE Heating System until the proper
water/anti-freeze solution has been added to the Oasis® NE
Heating System and all trapped air has been bled. An
inadequate mixture may cause system circulation problems and
potential Oasis® NE Heating System damage and/or personal
injury.

Use only a non-toxic, propylene glycol based coolant with

additives recognized as safe “GRAS” by the FDA. Refer to the

anti-freeze manufacturer recommendations for instructions for
your application.

Figure 7-5 Engine Heat / Pre-heat System Plumbing

7.7 Procedure For Filling/Purging The
Oasis® NE Heating System

7-8 The Oasis® NE Heating System

Section 7, Plumbing the System

2

Remove the front cover of the Oasis® NE, and using a self
priming pump, and fill the Oasis® NE Heating System through
the filler port (1/2" hose barb connection) located at the
bottom of the unit with a 50/50 mixture of propylene glycol
and water.

3

When the fluid starts to run into the overflow bottle, turn on
the Bypass Switch on the Zone Control Board and wait until the
coolant lines are filled and the overflow bottle fills to the
"Minimum when cool" level.

4

When this level is reached, turn OFF the filler pump, and keep
the bypass switch turned ON until the system is purged of air
and the coolant level in the overflow bottle does not change.

5

Once the system has been purged of air, turn OFF the Bypass
Switch on the Zone Control Board. This Bypass Switch should
remain off during normal operation. It is only used to fill and
purge the system. The shut-off valve on the filler hose must be
in the closed position when the system has been filled.

Figure 7-6 Filling/Purging Oasis® NE Heating System Engine
Heat / Pre-heat System Plumbing.

International Thermal Research 7-9

Operating the Oasis® NE

Section

8

Heating System

This section describes the features, operation and maintenance
of your new Oasis® NE Heating System. READ THESE
INSTRUCTIONS AND SAVE FOR REFERENCE.

8.1 Features of Your Oasis® NE Heating
System

The Oasis® NE Heating System uses an 50,000 BTU (true output)
diesel burner (12 VDC) controlled by a multi-functional electronic
controller as the primary source of heating coolant (anti-freeze
and water). Two 1500 Watt, 120 VAC immersion elements are
used as secondary heat sources to provide an additional 10,000
BTU of heat. The Oasis® NE Heating System heats the coolant to
provide a source of heat for all hydronic space heating needs.
Through the use of its integral distribution pumps, the Oasis® NE
Heating System has the ability to circulate the coolant to all
space heating areas. It can also provide a supply of domestic
hot water using the integral heat exchanger. The Oasis® also
incorporates engine heat and preheat functions. (see Figure 1-2:
Oasis® NE Heating System).

Other features of the Heating System include:

 Built in coolant distribution pumps capable of supplying

coolant to multiple heating fans in two separate loops, located
in up to five different zones.

 An internal heat exchanger provides for production of potable

hot water.

 A separate internal heat exchanger provides for use of engine

waste heat and engine pre-heat (optional). For engine pre-

International Thermal Research 8-1

Section 8, Operating the Oasis® NE Heating System

heat, an optional engine pre-heat pump and specific remote
panel switch must be installed.

 Support for high flow domestic hot water demand. The

system increases ground water temperature by 60F at a flow
of 3.0 GPM (using only the diesel burner). The mixing valve
(factory pre-set), will limit the temperature to 120F.

 Easy to install and field serviceable with the Oasis

®

NE
Heating System hookups and connections easily accessible
from the top of the heater.

 Easy to fill and purge, zero pressure system.
 Easy to drain.
 A high-temperature, stainless steel burner and stainless steel

jacket.

 7.5 US gallon welded, insulated stainless steel coolant tank

that minimizes heat loss and optimizes heat recovery.

 Domestic water flow switch for quick response to domestic

hot water demand.

 Low coolant level switch on the tank.
 Quiet operation and low power consumption.
 Low pressure fuel system with built-in fuel pump.
 Fuel efficient burner capable of burning a wide variety of

diesel-based fuels (CSA/UL certified for diesel #1 and #2).

 Exhaust has minimal smoke and smell.
 Fan assisted, sealed combustion chamber is designed to use

outside combustion air.

 Simple, low amperage draw ignition.
 Electronically-controlled system with:

 automatic Safety Shutdown;
 manual-resettable aquastats for safety overheat

protection.

 LED indicators on the Control Panel for diagnostics.
 Patented, proprietary flame sensor.

8-2 The Oasis® NE Heating System

Section 8, Operating the Oasis® NE Heating System

NOTICE

 Remote Operating Panel with ON/OFF switch for the diesel

burner, AC elements, and engine pre-heat, if installed.

 Control Panel buttons for Power, Bypass, Reset, and indicator

LED’s for operational and diagnostic information.

8.2 Operating Instructions for the

Oasis® NE Heating System

The Oasis® NE Heating System must be installed and connections
made in accordance with the recommendations in this
Installation and Operating Manual prior to operating the heater.

 The Oasis

Heating System, heats the coolant to a preset temperature
and will automatically cycle to maintain the temperature.

®

NE Heating System, Figure 8-1: Oasis® NE

Figure 8-1 Oasis® NE Heating System Overview

International Thermal Research 8-3

Section 8, Operating the Oasis® NE Heating System

8.3 Turning the Power to the Oasis® NE
Heating System ON

 The Oasis

®

NE Heating System’s main Control Panel (Figure
8-2), located on the front of the heater, contains three push
buttons: ON/OFF power, Bypass, and Reset. The power
switch must be pushed ON (power LED will turn ON) to turn
the DC electrical power to the main control board ON and is
required to be left ON whenever heat is required.

 The Zone Control board (Figure 8-4) will be powered

whenever the master disconnect switch is ON. The master
disconnect switch must be left ON whenever heat is required.

 When the Oasis

®

NE Heating System is shut down for any
extended period or the season, it is recommended that the
power switch and the battery master disconnect switch be
turned OFF.

Figure 8-2 Oasis® NE Main Control Panel

8-4 The Oasis® NE Heating System

Section 8, Operating the Oasis® NE Heating System

NOTICE

! DANGER

Do not operate the Oasis® NE Heating System until a suitable
water/anti-freeze solution is in the heater and all trapped air has
been bled or removed.

Use only a non-toxic propylene glycol based coolant with
additives generally recognized as safe ”GRAS” by the FDA in the
Oasis® NE Heating System.

8.4 Activating the Burner (Primary) and

AC Heat (Supplemental) from the
Remote Operating Panel

Activating the Burner (Primary Heat Source)

 The burner switch on the Remote Operating Panel controls the

ON/OFF of the diesel burner (primary heat source). When the
burner switch is turned ON, the diesel portion of the Oasis®
NE will turn ON after ten seconds. The Burner LED will turn
ON when the diesel burner has been activated. The burner
will continue to operate until the coolant in the Oasis® NE
reaches cycling temperature. At this point, the diesel burner
will turn OFF. If the Oasis® NE Heating System coolant
should cool down below this temperature range, the burner
will again commence firing and will continue until either the
burner switch on the remote panel is turned OFF or cycling
temperature is again achieved. If the burner switch on the
remote panel is turned OFF, or cycling temperature is
achieved, the burner stops and the Oasis® NE enters a two
minute cool down stage prior to completely shutting down.

Activating the AC Immersion Element(s) (Supplemental
Heat Source)

 Place the AC power switch on the Remote Operating Panel to

either the one element or two element position. The AC Heat
(green) LED will turn ON indicating the AC element(s) are
energized and the coolant is being electrically heated. The
elements will continue to operate until the coolant in the
Oasis® NE reaches cycling temperature. At this point, the
elements and the AC heat LED will turn OFF. If the Oasis® NE
Heating System coolant should cool down below this

International Thermal Research 8-5

Section 8, Operating the Oasis® NE Heating System

NOTICE

temperature range, the AC element(s) will again be energized
and will continue until either the AC switch on the remote
panel is placed in the OFF position or cycling temperature is
again achieved. If the AC element switch on the remote
panel is turned OFF, or cycling temperature is achieved, the
AC elements are de-energized and the AC Heat (green) LED
turns OFF.

Activating the Burner and AC immersion Element(s)
Jointly

 Turn the burner switch ON and place the AC power switch on

the Remote Operating Panel to either the one element or two
element position. The Burner and AC Heat (green) LED’s will
turn ON indicating the diesel burner and AC element(s) have
been selected.

8.5 Activating the Cabin Fan Heaters
through the Thermostats

Burner or AC Heat or Engine Heat Source Available

 Any thermostat connected to the Zone Control Board and

calling for heat will cause the cabin fan and loop pump
controlled by that thermostat to be enabled (only if the
coolant inside the Oasis® NE is above 120F). Note that zones
1 and 2 control Loop 1 Pump. Zones 3, 4, and 5 control Loop
2 Pump. Once the room temperature has reached the
temperature called for by the thermostat the cabin fan will
turn off.

8.6 Activating the Potable Hot Water

Burner or AC Heat or Engine Heat Source Available

 As long as the coolant in the Oasis

unit will respond to a call for potable hot water. Ensure that a
heat source has been selected (i.e. Burner, AC, Engine). The
production of the potable hot water is continuous when the
burner is operating and limited when using AC or engine
heat.

®

NE is above 120F, the

The potable water pump is not a part of, nor controlled by the
Oasis® NE Heating System.

8-6 The Oasis® NE Heating System

Section 8, Operating the Oasis® NE Heating System

WARNING

NOTICE

NOTICE

8.7 Potable Water Temperature
Adjustment

A thermostatic mixing valve located inside the Oasis® NE allows
for adjusting the temperature of the potable hot water. The
mixing valve is factory set to limit the maximum water
temperature to 120ºF (49°C) with a total potable hot water
demand of 3.0 GPM or less, and an incoming water temperature
of 60ºF (15ºC) or higher. If needed this valve can be adjusted in
a range from 95F (35°C) to a maximum of 145F (63°C).

The mixing valve will compensate for temperature variations of
incoming supply water and maintain the temperature to which it
is set. However, in some cases, the temperature of the incoming
water and the flow-rate demand of multiple faucets may limit the
ability of the Oasis® NE to provide hot water at the temperature
setting of the mixing valve, even if the mixing valve is set to its
maximum. This is a normal operating characteristic of any on­demand, continuous hot water system that does not rely on heat
retained within a stored volume of water. In this situation the
temperature of the hot water may be increased by lowering the
flow at the faucet and shower head.

To adjust the mixing valve, the side cover of the Oasis® NE must
be removed. To access the valve, the valve cap must be
removed. The mixing valve adjustment knob is shown in Figure
8-3.

Figure 8-3 Mixing Valve Location

International Thermal Research 8-7

Section 8, Operating the Oasis® NE Heating System

WARNING

The parts inside the heater are HOT when in operation. Use
gloves when adjusting the mixing valve.

Turning the mixing valve knob clockwise will decrease the hot
water outlet temperature and turning the knob counter-clockwise
will increase the temperature.

8.8 Activating Engine Heat & Pre-heat

Burner or AC Heat On

Pre-heating the Engine (optional)

 Turn the engine preheat switch on the Remote Operating

Panel to the ON position with the burner or AC switch turned
ON. The engine preheat pump and coolant distribution pump
will be activated once the Oasis® NE Heating System is within
its set operating temperature range. The engine will start to
be preheated by the Oasis® NE Heating System.

Engine Heat Used for Potable Water or Space Heating

 Start the vehicle engine and let it come up to the normal

operating temperature. Turn the burner switch on the
Remote Operating Panel to the ON position. The Oasis® NE
Heating System will come up to the set operating
temperature range and will cycle OFF. The heat from the
vehicle engine will be transferred from the engine to the
potable water and space heating loops. The burner and/or the
AC elements will remain off if enough heat is provided by the
engine. If the heat transferred from the engine is not
sufficient to meet the space heating and potable hot water
demand, the burner and/or the AC elements will turn ON.

8-8 The Oasis® NE Heating System

Section 8, Operating the Oasis® NE Heating System

8.9 Functions of the Remote Operating
Panel

 The Oasis Heating System’s Remote Operating Panel,

Figure 8-4: Remote Operating Panel, contains one ON/OFF
burner switch, one triple position AC element switch, one
ON/OFF engine heat switch to control the optional engine pre­heat pump, and four LED’s indicating Burner activation, AC
element activation, heater fault, and zone fault.

Figure 8-4 Remote Operating Panel

Burner Switch (Primary Heat Source)

 The burner switch on the remote panel controls the ON/OFF of

the diesel burner. The Burner LED will turn on when the
diesel burner has been activated, and will remain ON while
the burner cycles on and off.

International Thermal Research 8-9

Section 8, Operating the Oasis® NE Heating System

AC Element Switch (Supplemental Heat Source)

 The triple position AC element switch controls the activation

of a single 120 VAC immersion element only, dual 120 VAC
immersion elements jointly, or both elements off. The AC
heat LED will turn ON to indicate when the element(s) are
operating.

Engine Pre-Heat Switch (optional)

 The engine pre-heat switch (optional) controls the ON/OFF of

the engine pre-heat pump (optional). However, the engine
pre-heat pump (not included) will not function unless the
coolant in the Oasis® NE Heating System has achieved a
preset temperature.

Burner LED (Green)

 When ON, indicates the diesel burner has been activated.

AC Heat LED (Green)

 When ON, indicates one or both of the 120 VAC immersion

elements(s) are operating.

Heating Module Fault LED (Red)

 When ON, indicates the Oasis

®

NE has faulted. The specific
fault can be identified by examining the Control Panel located
on the front of the Oasis® NE. There are indicator LED’s on
the panel that are used for diagnostics. Refer to the
description of the Oasis® NE Control Panel (section 8.10) for
further details.

Zone Fault LED (Red)

 When ON, indicates a space heating zone(s) has faulted. The

specific fault can be identified by examining the Zone Control
Board located beside the Oasis® NE. There are indicator
LED’s on the panel that indicate the problem. Refer to the
description of the Zone Control Board (section 8.11) for
further details.

8-10 The Oasis® NE Heating System

Section 8, Operating the Oasis® NE Heating System

8.10 Functions of the Oasis® NE Control

Panel

 The Oasis

®

NE Control Panel (Figure 8-2) contains three push

buttons: Power ON/OFF, Bypass, and Reset. In addition, it

contains nine LED’s indicating Power, AC Heat, Compressor,

Fuel Pump, Combustion Fan, Igniter, Flame Out, Voltage Fault
and Low Water.

Power Button

 The power button turns ON/OFF the power to the control

board. The Power LED (green) turns ON when the power to
the control board is ON.

Bypass Button

 The bypass button is for authorized service personnel

only.

Reset Button

 The reset button when pressed resets the control board.

Power LED (Green)

 The power LED (green) turns ON when the power to the

control board is ON. The LED flashes when the Oasis® NE is in
Bypass mode.

AC Heat LED (Green)

 The AC Heat LED (Green) turns ON when 120VAC is

connected to the unit and the system has not yet reached the
set point operating temperature.

Compressor, Fuel Pump, Combustion Fan, Igniter (Green)

 The compressor, fuel pump, combustion fan, and igniter LED’s

(Green) turn ON when the component is ON, and will flash if
the component is electrically open or shorted.

Flame Out (Red)

 The Flame Out LED (Red) turns ON when a flame fault has

been detected.

International Thermal Research 8-11

Section 8, Operating the Oasis® NE Heating System

Voltage Fault (Red)

 The voltage fault LED (Red) turns ON when a voltage fault

has been detected.

Low Water (Red)

 The Low Water LED (red) turns ON when a low coolant level

in the Oasis® NE has been detected.

8.11 Functions of the Zone Control Board

 The Zone Control Board (Figure 8-5) contains seven green

LED’s for Power, Zone 1, 2, 3, 4 and 5 Thermostats, and
Potable Water.

 It also contains nine matched pairings of red/green LED’s for

Zone 1, 2, 3, 4 and 5 Fans, Summer Loop, Heat Loop 1, Heat
Loop 2, and Engine Pre-heat Pump.

 For the Zone Control Board to respond to a call for heat, the

coolant temperature inside the Oasis® NE must be above
120F. When thermostats in Zones 1 or 2 call for heat, the
cabin fans for those zones will turn ON, and the Heating Loop
1 Pump will activate and circulate hot coolant throughout the
loop. When thermostats in Zones 3, 4, or 5 call for heat, the
cabin fans for those zones will turn ON, and the Heating Loop
2 Pump will activate and circulate hot coolant throughout the
loop.

 When the Engine Pre-Heat switch is turned ON, the Zone

Control Board will turn on the Summer Pump and circulate hot
coolant through the engine heat exchanger. At the same time,
the engine pre-heat pump will turn ON and circulate the
engine coolant through the engine heat exchanger.

 When the potable hot water is turned ON, the Zone Control

Board will turn on the Summer Pump and circulate hot coolant
through the internal potable water heat exchanger.

 When the Burner is turned ON, the Zone Control Board will

turn on the Summer Pump and circulate hot coolant through
the internal circuit, to provide even heating in the coolant
tank.

8-12 The Oasis® NE Heating System

Section 8, Operating the Oasis® NE Heating System

Figure 8-5: Zone Control Board

Power LED (Green)

 The power LED turns ON when the power to the Zone

Control Board is ON.

Zone 1, 2, 3, 4, 5 Thermostat LED’s (Green)

 The Zone # LED turns ON when the thermostat in the zone is

calling for heat.

Potable Water LED (Green)

 The potable water LED turns ON when there is a call for

potable hot water.

Zone 1, 2, 3, 4, 5 Fans, Summer Loop, Heat Loop 1, Heat
Loop 2, Engine Pre-heat Pump Paired LED’s (Red/Green)

 The nine paired LED’s indicate the functionality of the

corresponding devices. The green LED will turn ON when the
device is operating normally. The red LED turns ON if a fuse
has been blown.

International Thermal Research 8-13

Section 8, Operating the Oasis® NE Heating System

8.12 Potable Water and Space Heating
Priority

 By default, the Zone Control Board is shipped with the

heating priority set for potable hot water. This means that
when there is a call for potable hot water, the space
heating will shut down so all of the available heat can be
directed to the potable hot water circuit. This is done to
support a high flow rate potable hot water demand.

 If the user wishes to have potable water and space heating

function at the same time, with the understanding that the
potable hot water performance will drop, then a "Priority"
jumper located towards the top left of the Zone Control
Board can be set (Figure 8-5).

Figure 8-6: Zone Control Board Priority Jumper

8-14 The Oasis® NE Heating System

Section 8, Operating the Oasis® NE Heating System

8.13 Maintenance

Customer Monthly Maintenance: Check the following and
correct as required:

 Coolant hoses and fittings for leaks and integrity.
 Check coolant level in the overflow bottle (3/4 full when

hot). Fill only when the system is COLD and in small
quantities only to prevent overfilling.

 Exhaust fittings, fuel fittings and connections, plumbing

fittings and connections, for leaks and integrity.

 Exhaust and air-intake checked for no obstructions.
 Fuel lines, fittings for leaks and integrity.
 External fuel filter for clogging.

Annual Service Requirements: Perform the following:

 Prior to operation for the season, a factory service

tune-up of the Oasis® NE Heating System should be
performed by trained service personnel. Only

personnel familiar with the equipment and its operation
perform the service tune-up. It is recommended that the
dealer be contacted for this service or if not available,
contact ITR for information on service resources.

 As a general guide, the regular maintenance items such as

the igniter, fuel filters (nozzle filter and external filter),
and air compressor filter should be replaced as opposed to
inspected and cleaned. Their performance may be
deteriorating and/or their remaining service life ending
without any apparent visual signs or operating symptoms.

 The major components such as the air compressor, fuel

pump, fuel nozzle, and combustion air fan should be
examined for wear and should be serviced or replaced by
the service technician as required.

 The combustion tube should be inspected by the service

technician for wear and replaced if necessary. To access
the combustion tube, the front panel of the Oasis® must

International Thermal Research 8-15

Section 8, Operating the Oasis® NE Heating System

NOTICE

! DANGER

NOTICE

be removed along with the burner box cover. The fuel
block must then be removed from its mounting position.
Finally, the burner and counter-flow tube must be taken
out by removing the nuts holding the burner box in
position. If the tube is satisfactory, a thorough cleaning of
the tube and burner chamber should be performed by
blowing out and vacuuming any ash and carbon buildup.
Any build up on the surface of the burner chamber will
cause the heater to lose efficiency.

 Regular inspection and maintenance is the only way to

ensure safe, reliable and efficient operation of your heating
system.

8.14 Protecting the Heating System

Protect the Oasis® NE Heating System from temperature
extremes and any dusty, dirty, corrosive environment.

Protect the Oasis® NE Heating System from cold temperatures
and corrosion by using a proper mixture of anti-freeze and water.
Use only a non-toxic propylene glycol based coolant with

additives generally recognized as safe “GRAS” by the FDA in the

Oasis® NE Heating System. Read and follow the anti-freeze
manufacturer’s instructions for the type of anti-freeze and
mixture recommended for your application.

Note that any potable water in the Oasis® NE will freeze in cold
temperatures and will damage the internal parts. The potable
water heat exchanger must be drained (using provided drain
valve) before freezing temperatures are encountered.
Alternatively, the potable water system can be flushed with
winterizing antifreeze that is safe for use in the potable water
lines.

8-16 The Oasis® NE Heating System

Section 8, Operating the Oasis® NE Heating System

8.15 General Troubleshooting

Ensure that your heating system has both sufficient
battery voltage and ground, and coolant level. The Oasis®
NE is designed not to allow operation if these are incorrect
(indicated by a lit Voltage LED or Low Water LED on the
Oasis® NE Control Panel).

Burner Does Not Start Up

 Oasis
 Power button on Oasis

®

NE connected to 12 VDC power?

®

NE Control Panel pushed ON?

Power LED lit on Oasis® NE Control Panel?

 Burner switch on Remote Operating Panel ON? Burner

LED lit on Remote Operating Panel?

 Main fuse or circuit breaker blown or tripped?

AC immersion elements do not activate

 Primary Electric Element wires on Oasis

®

NE connected to

120 VAC power?

 AC switch on Remote Operating Panel placed in the one or

two element position? AC Heat LED is lit on Remote
Operating Panel?

 AC immersion elements circuit breakers tripped?

Burner Starts but Flame Faults

 Fuel nozzle plugged or dirty?
 Fuel supply present and adequate?
 Air-intake or exhaust not blocked or obstructed?
 Air in fuel line (white smoke from exhaust or popping

sound from exhaust)?

 Fuel filter (external) dirty?
 Restrict the fuel return line with needle valve or pinch off

completely.

International Thermal Research 8-17

Section 8, Operating the Oasis® NE Heating System

Burner Starts but Zone Faults

 Power LED on Zone Control Board glowing green?
 Component matched LED pairings all glowing green on the

Zone Control Board?

 Fuse blown for one of the pumps or cabin fans on the Zone

Control Board?

8-18 The Oasis® NE Heating System

Warranty Information

Attention Purchaser and Installer

General Warranty

 ITR warrants the OASIS® CH50, OASIS® COMBI, NE, and NE-S (referred to as

“heater(s)”) DISTRIBUTION MODULE and all accessories or other supplied components

with the original purchase to be free of defects in materials and workmanship under

design usage and service conditions for ONE (1) year from the heater “in-service” date.
Warranty replacement parts are covered for the remainder of the heater’s warranty.

 You must install the Product in compliance with the specifications, standards, and

instructions in the Installation Manual.

 If you need to depart from the manual, you must first consult and obtain the written

approval of ITR. Otherwise, your warranty may be voided or limited.

 Systems that are not installed to the published installation instructions (unless with

prior written approval of ITR) will be ineligible for warranty coverage.

 Fill in the enclosed Warranty Card completely. It must be signed by the Owner and

returned to ITR within 30 days of the date of the original installation. The Owner
cannot transfer this warranty. Before mailing, make photocopies of the completed
Warranty Card for your records. It will be a valuable reference if you need warranty
repairs in the future.

Limited Warranty

The following warranties are in lieu of all other warranties and conditions. ITR makes no
other warranties, representations, or conditions, express or implied. Expressly excluded
are all implied or statutory warranties or conditions of merchantability of fitness for a
particular purpose, and those arising by statute or otherwise in law or from dealing or
trade usage.

The stated express warranties are in lieu of all liabilities or obligations for damages arising
out of or in connection with the delivery, use, performance, or licensing of the Product or
in connection with any services performed. In no event whatsoever will ITR be liable for
indirect, consequential, exemplary, incidental, special, or similar damages, including but
not limited to, lost profits, lost business revenue, failure to realize expected savings, other
commercial or economic loss of any kind or any claim against ITR by any other party
arising out of or in connection with the sale, delivery, use, performance, or repair of the
Product, or in connection with any services performed, even if ITR has been advised of the

possibility of such damages, whether based upon warranty, contract, or negligence. ITR’s

maximum liability shall not in any case exceed the contract price for the Products claimed
to be defective.

No one is authorized to increase, alter, or enlarge ITR’s responsibilities or obligations

under these warranties.

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Warranty Information International Thermal Research

Owner’s Responsibilities

If any warrantable failures occur before the expiration of the warranty, the Owner must
give notice of such failures to ITR or to the authorized ITR dealer from which the Product
was originally purchased, and obtain written approval for the warranty repair.

The Owner is responsible for the following costs in case of a warrantable failure:

 shipping and insurance costs to deliver the defective Product to the dealer or ITR

(if necessary)

 all repairs made to equipment ancillary to the Product, including the vehicle, coach

engine, and other associated components of the vehicle in which the Product is
installed

 lodging, meals, and other incidental expenses incurred by the Owner as a result of a

warrantable failure

 “down time” expenses and all business costs and losses resulting from the warrantable

failure

Not Covered Under Warranty

Warranty will be voided or not extended in the following circumstances:

 Owner fails to notify ITR or the authorized ITR dealer from which the Product was

originally purchased about a warrantable failure and to obtain prior written approval for
warranty repair.

 Original serial number on Product or electrical control board has been removed,

altered, or is unreadable.

 Product has been modified or uses non-standard parts not approved by ITR.
 Product has been abused (such as by dropping it), damaged, vandalized, or has

received improper maintenance.

 Product has been run dry or operated without appropriate antifreeze, causing damage

to the heat exchanger, pump seals, etc.

 Product has been exposed to an environment detrimental to its effective operation,

such as excessively wet, dirty, or hot areas.

Also not covered under warranty:

 Parts or Products no longer within the manufacturer’s warranty period.
 Parts or Products installed or used in a manner contrary to ITR’s printed instructions

without ITR’s prior written permission.

 Normal wear and tear of parts, including but not limited to, fuel filter, air filter, nozzles,

fuses, ignitor, electrical motors, fuel pumps, air compressors, and carbon brushes.

 Product malfunctions due to improper installation of parts or Products, including but

not limited to malfunctions causing inadequacies in air, fuel, or coolant flow; voltage
problems due to improper wiring; and shock or vibration.

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International Thermal Research Warranty Information

1.

Immediately contact ITR (or your Dealer) and provide a full description of the
problem.

2.

Obtain (in writing) a Return or Repair Material Authorization (RMA) number from ITR
for any warranty, return, repair, or service. ITR will refuse any return package and
will not authorize service or repairs without a RMA number. (For repairs by
authorized Dealers, the dealer must obtain an authorized RMA number from ITR
before warranty work commences.)

3.

When shipping your Product, pack securely, show the RMA and serial number of the
Product on the outside of the shipping container, and ship prepaid and insured.

4.

Provide written details of the problems, date of installation, proof of purchase, and a
return address.

 Progressive damage to the engine or vehicle caused by failure of the Product or an

improper installation.

 Diagnosis or repairs to fix problems not directly related to the Product or due to empty

fuel tanks or poor fuel quality, fuel additives, acidic water, electrolysis, or any chemical
reactions.

 Travel time and expenses by an ITR dealer.
 Removal and re-installation expenses for the ITR heater.

Customer Service Calls

ITR warrants the ITR heater and the Dealer warrants the installation.

If you have a service problem, first check the Troubleshooting section of the Owner’s
Manual to determine if your problem is addressed. Also ensure you are familiar with the
design and installation setup.

When calling ITR or the Dealer with a service problem, have the following information
ready at hand:

 model number and serial number of the Product
 a detailed description of the problem
 your Installation Manual and Owner’s Manual

Depending on your location, an authorized service person may be able to visit your coach
or yacht to help troubleshoot problems and repair your Product. Such service calls are at
the Owner’s expense. Regardless, you must obtain written approval from ITR or the Dealer
for any warranty repair before it is undertaken. All repairs done under warranty are
subject to the terms and conditions of the flat-rate manual.

Returns

If a service call by an authorized service person is not feasible, the Owner must do the
following to obtain warranty service:

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Warranty Information International Thermal Research

After repair or replacement of the Products still under warranty, ITR will pay return
shipping charges. All repairs done under warranty are subject to the terms and conditions
of the flat-rate manual.

Telephone / Email Service

Service information given over the telephone, by fax or by email is given only in good faith
as an accommodation to the customer. Such information should not be relied upon without
an independent verification of its applicability to the customer’s particular situation. For
customer service or other information, contact:

IN CANADA: IN THE UNITED STATES:

2431 Simpson Road 11915 NE 56th Circle, Suite B

Richmond, BC, Canada V6X 2R2 Vancouver WA USA 98682

Tel: [phone] or 604-278-1272 Tel: [phone] or 360-993-4877

Fax: [phone] Fax: [phone]

Email: [e-mail] Email: [e-mail]

Website: http://www.itrheat.com

Page 4 January 2016