Rapid Engineering UHAT 175, UHAT 400, UHAT 300, UHAT 350, UHAT 200 Installation, Operation & Service Manual

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Page 1

FOR YOUR SAFETY If you smell gas:

1. Open windows.

2. DO NOT try to light any appliance.

3. DO NOT use electrical switches.

4. DO NOT use any telephone in your building.

5. Extinguish any open flame.

6. Leave the building.

7. Immediately call your local gas supplier after leaving the building. Follow the gas supplier’s instructions.

8. If you cannot reach your gas supplier, call the Fire Department.

WARNING

Fire Hazard

Keep all flammable objects, liquids and vapors the minimum required clearances to combustibles away from heater.

UHA-Series

Tubular Unit Heaters

(Standard Range)

Installation, Operation

& Service Manual

Models UHA[T][M][X][S]

150, 175, 200, 225 250, 300, 350, 400

Some objects will catch fire or explode when placed close to heater.

Failure to follow these instructions can result in death, injury or property damage.

WARNING

Improper installation, adjustment, alteration, service or maintenance can result in death, injury or property damage. Read the Installation, Operation and Service Manual thoroughly before installing or servicing this equipment.

Installation must be done by a contractor qualified in the installation and service of gas-fired heating equipment or your gas supplier.

Installer

Please take the time to read and understand

these instructions prior to any installation.

Installer must give a copy of this manual to the owner.

Owner

Keep this manual in a safe place in order to provide

your service technician with necessary information.

Rapid Engineering LLC

1100 Seven Mile Road NW Comstock Park, MI 49321 Telephone: +1.616.784.0500 Fax: +1.616.784.1910 Toll Free: 800.536.3461

www.rapidengineering.com

P/N RP111101NA 11/14 Rev. J

Page 2

Page 3

POUR VOTRE SECURITE

Si vous sentez une odeur de gaz:

1. Ouvrir les fenêtres.

2. N’essayer pas d’allumer un appareil.

3. N’utiliser pas d’interrupteurs électriques.

4. N’utiliser pas de téléphone dans votre bâtiment.

5. Eteindre flamme nue.

6. Quitter le bâtiment.

7. Après avoir quitté le bâtiment, appelez immédiatement votre fournisseur local de gaz. Suivre les instructions du fournisseur de gaz.

8. Si vous ne pouvez pas joindre votre fournisseur de gaz, appeler le service d’incendie.

AVERTISSEMENT

UHA-Series

Aérothermes tubulaire

(Gamme standard)

Manuel d’installation,

d’operation, et de service

Modèles UHA[T][M][X][S]

Risque d’incendie

Garder tous les objets, liquides ou vapeurs inflammables à la distance minimale de l’unité de chauffage requise avec les matériaux combustibles.

Certains objets prendront feu ou exploseront s’ils sont placés à proximité de l’unité de chauffage.

Le non respect de ces instructions peut entraîner la mort, des blessures corporelles ou des dommages matériels.

ATTENTION

Linstallation, lajustement, laltération, le démarrage ou lentretien inadéquat peuvent causer la mort, des blessures ou des dégâts matériels. Lire entièrement le manuel dinstallation, dopération et dentretien avant linstallation ou l'entretien de cet équipement.

150, 175, 200, 225 250, 300, 350, 400

Installateur

Prenez le temps de lire et comprendre ces instructions

avant toute installation.

Linstallateur doit remettre au propriétaire

un exemplaire de ce manuel.

Linstallation doit être effectuée par un installateur éprouvé/contractant qualifié dans linstallation et la maintenance du système de chauffage par infrarouge activé au gaz.

Propriétaire

Gardez ce manuel dans un endroit sûr pour

fournir des informations au réparateur

en cas de besoin.

Rapid Engineering LLC

1100 Seven Mile Road NW Comstock Park, MI 49321 Téléphone: +1.616.784.0500 Fax: +1.616.784.1910 Numéro sans fraís: 800.536.3461

www.rapidengineering.com

P/N RP111101FC 11/14 Rev. J

Page 4

Page 5

TABLE OF CONTENTS

SECTION 1: Heater Safety...................................................... 1

1.1 Manpower Requirements .............................................1

1.2 Safety Labels and Their Placement..............................1

1.3 California Proposition 65 ..............................................1

SECTION 2: Installer Responsibility .....................................4

2.1 Wall Tag ....................................................................... 4

2.2 Corrosive Chemicals....................................................4

2.3 National Standards and Applicable Codes...................4

SECTION 3: Critical Considerations .....................................5

3.1 Basic Information .........................................................5

3.2 Manufactured Units......................................................5

3.3 Location and Suspension ............................................5

3.4 Minimum Required Installation Clearances .................5

3.5 Ventilation .................................................................... 5

3.6 Gas Supply .................................................................. 5

3.7 Electrical Supply .......................................................... 5

3.8 Vent ..............................................................................5

SECTION 4: Clearances TO combustibles............................6

4.1 Required Clearances to Combustibles.........................6

4.2 Clearances to Combustibles ........................................6

SECTION 5: National Standards and Applicable Codes......8

5.1 Gas Codes................................................................... 8

5.2 Aircraft Hangars ...........................................................8

5.3 Parking Structures and Repair Garages...................... 8

5.4 Electrical ...................................................................... 8

5.5 Venting .........................................................................8

5.6 High Altitude.................................................................8

SECTION 6: Heater installation..............................................9

6.1 General ........................................................................9

6.2 Suspension..................................................................9

SECTION 7: Venting .............................................................. 10

7.1 Venting........................................................................ 10

7.2 Vent Installation ..........................................................10

7.3 Horizontal Venting....................................................... 11

7.4 Vertical Venting ........................................................... 11

7.5 Maximum Vent Lengths Table..................................... 11

7.6 Vent Material............................................................... 11

7.7 Replacing an Existing Heater in a Venting System ..... 11

SECTION 8: Air Supply......................................................... 17

8.1 Separated Combustion Installation ............................17

8.2 Building Ventilation.....................................................17

8.3 Outside Combustion Air Supply .................................17

SECTION 9: Gas Piping ........................................................ 18

9.1 Connections............................................................... 18

SECTION 10: Wiring ..............................................................20

10.1 Positioning Thermostats...........................................20

10.2 Low Voltage Thermostat for Models UHA[T][M][X][S]

150-400.....................................................................21

10.3 UHA[X][S] Series Internal Wiring Diagram for

Single Stage Gas Valves ..........................................22

10.4 UHA[X][S] Series Ladder Wiring Diagram for

Single Stage Gas Valves ..........................................23

10.5 UHA[T][X][S] Series Internal Wiring Diagram for

Two Stage Gas Valves ..............................................24

10.6 UHA[T][X][S] Series Ladder Wiring Diagram for

Two Stage Gas Valves ............................................. 25

10.7 UHA[M][X][S] Series Internal Wiring Diagram for

Modulating Gas Valves............................................ 26

10.8 UHA[M][X][S] Series Ladder Diagram for

Modulating Gas Valves............................................ 27

10.9 Electrical Connection to the Heater ......................... 28

SECTION 11: Operation and Maintenance ......................... 29

11.1 Pre-Start-Up Checks ................................................ 29

11.2 Begin Start-Up ......................................................... 30

11.3 Pressure Switch........................................................ 34

11.4 Turning Off the Heater .............................................. 34

11.5 External Controls...................................................... 34

11.6 Complete the Start-Up ............................................. 34

11.7 Instruction to the User.............................................. 34

SECTION 12: User Instructions........................................... 35

12.1 Heater Operation..................................................... 35

12.2 Lighting Instructions ................................................ 35

12.3 Simple Troubleshooting ........................................... 35

SECTION 13: Servicing ........................................................ 37

13.1 Servicing Instructions .............................................. 37

13.2 Burner Maintenance................................................ 37

13.3 Fan/Motor Assembly Maintenance .......................... 37

13.4 Heat Exchanger Maintenance ................................. 38

13.5 Gas Valve Maintenance........................................... 38

13.6 Flue Blower ............................................................. 38

13.7 Venting and Air Intake Pipe ..................................... 38

13.8 Maintenance Checklist ............................................ 38

SECTION 14: Troubleshooting............................................. 41

14.1 General.................................................................... 42

14.2 Troubleshooting For Automatic Ignition Burner

Systems................................................................... 43

14.3 Troubleshooting for Flame Supervision System....... 44

14.4 Troubleshooting for Gas Valves ............................... 45

14.5 Troubleshooting for Flue Blower .............................. 45

SECTION 15: Replacement Parts ........................................ 46

15.1 Gas Valve ................................................................ 46

15.2 Burner Compartment for Models UHA[T][M][X][S]

150-400 ................................................................... 47

15.3 Ignition Electrode and Flame Probe for Models

UHA[T][M][X][S] 150-400......................................... 49

15.4 Heat Exchanger....................................................... 50

15.5 Louvers and Louver Spring ..................................... 50

15.6 Flue Blower for Models UHA[T][M][X][S] 150-300 .. 51

15.7 Flue Blower for Models UHA[T][M][X][S] 350-400 .. 52

15.8 Pressure Switch....................................................... 53

15.9 Ignition Control ........................................................ 53

15.10 Axial Fan/Guard/Motor Assembly........................... 53

15.11 Limit Switches........................................................ 54

SECTION 16: Specifications................................................ 55

16.1 Dimension Data for Models UHA[T][M][X][S]

150-250.................................................................... 55

16.2 General Technical Data Table .................................. 56

16.3 Technical Data Table................................................ 56

Rapid Engineering LLC

All rights reserved. No part of this work covered by the copyrights herein may be reproduced or copied in any form or by any means - graphic, electronic, or mechanical, including photocopying, recording, taping or information storage and retrieval systems - without the written permission of Rapid Engineering LLC.

Printed in U.S.A.

Page 6

16.4 Dimension Data for Models UHA[T][M][X][S]

300-400 ................................................................... 57

16.5 General Technical Data Table ..................................58

16.6 Technical Data Table ................................................ 58

SECTION 17: The RAPID

UHA-Series Warranty................ 59

Page 7

TABLE OF FIGURES

Figure 1: UHA[T][M][X][S]150 - 250 Label Placement ..............2

Figure 2: UHA[T][M][X][S]300 - 400 Label Placement .............. 3

Figure 3: Installation Clearances and Clearances to

Combustibles .............................................................7

Figure 4: Suspension Methods ................................................. 9

Figure 5: Vent and Roof Detail ................................................12

Figure 6: Standard Vented Heater - Vertical and Horizontal

Vent Termination.......................................................13

Figure 7: Standard Vented Heater - Common Vertical Vent

Termination............................................................... 14

Figure 8: Separated Combustion Heater - Vertical and

Horizontal Vent Termination ..................................... 15

Figure 9: Concentric Vent Box.................................................15

Figure 10: Concentric Vertical and Horizontal Vent

Termination - Separated Combustion Heater.......... 16

Figure 11: Gas Connection...................................................... 19

Figure 12: Automatic Burner Control Sequence......................30

Figure 13: Single Stage Gas Valve for Models UHA[X][S]

150 - 400.................................................................31

Figure 14: Two Stage Gas Valve for Models UHA[T][X][S]

150 - 400.................................................................31

Figure 15: Modulating Gas Valve for Models UHA[M][X][S]

150 - 400.................................................................32

Figure 16: LED Diagnostic Codes ...........................................36

There are references in this manual to various trademarks. All trademarks mentioned herein, whether registered or not, are the property of their respective owners. Rapid Engineering LLC is not sponsored by or affiliated with any of the trademark or registered trademark owners, and makes no representations about them, their owners, their products or services.

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SECTION 1: HEATER SAFETY

Your Safety is Important to Us! This symbol is used throughout the manual to notify you of possible fire, electrical or burn hazards. Please pay special attention when reading and following the warnings in these sections.

Installation, service and, at a minimum, annual inspection of heater must be done by a contractor qualified in the installation and service of gas-fired heating equipment. Read this manual carefully before installation, operation or service of this equipment. Heaters are not approved for residential installation.

These instructions, the layout drawing, local codes

and ordinances and applicable standards that apply to gas piping, electrical wiring, venting, etc. must be thoroughly understood before proceeding with the installation. Protective gear is to be worn during installation, operation and service in accordance to the Occupational Safety and Health Administration (OSHA). Gear must be in accordance to NFPA 70E, latest revision when working with electrical components. Thin sheet metal parts have sharp edges. To prevent injury, the use of work gloves is recommended. Before installation, check that the local distribution conditions, nature of gas and pressure and adjustment of the equipment are compatible.

The heater must be applied and operated under the

general concepts of reasonable use and installed using the best building practices.

This equipment is not intended for use by persons

(including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the equipment by a person responsible for their safety. Children should be supervised to ensure that they do not play with the equipment. For additional copies of the Installation, Operation and Service Manual, please contact Rapid Engineering LLC.

SECTION 1: HEATER SAFETY

Please contact Rapid Engineering LLC or your RAPID

independent distributor to obtain replacement signs or labels. See Page 2, Figure 1 through Page 3, Figure 2.

1.3 California Proposition 65

In accordance with California Proposition 65 requirements, a warning label must be placed in a highly visible location on the outside of the equipment (i.e. near equipment's serial plate). See label placement drawing on Page 2, Figure 1 through Page 3, Figure 2 for label location. Avoid placing label on areas with extreme heat, cold, corrosive chemicals or other elements. To order additional labels, please contact Rapid Engineering LLC or your RAPID

independent distributor.

1.1 Manpower Requirements

To prevent personal injury and damage to the

heater, two persons will be required for installation.

1.2 Safety Labels and Their Placement

Product safety signs or labels should be replaced by the product user when they are no longer legible.

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Page 10

UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Figure 1: UHA[T][M][X][S]150 - 250 Label Placement

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Description Part Number

Logo Label 91031102 Cut Hazard Label 91010430 Vent Length Label 91039505 Vent to Outdoors Label 91010427 Warning Label 91010429 Rating Plate Label 91010418 Installation Label 91010431 Instruction Location Label 91010433 Lighting Instruction Label 91010425 Venting Arrangement Label* 91010426 Proposition 65 Label 91070015 0-10VDC Modulating Label** 91040196

*For separated combustion units only. **For modulating units only.

Page 11

Figure 2: UHA[T][M][X][S]300 - 400 Label Placement

SECTION 1: HEATER SAFETY

Description Part Number

*For separated combustion units only. **For modulating units only.

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Page 12

UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 2: INSTALLER RESPONSIBILITY

The installer is responsible for the following:

2.2 Corrosive Chemicals

• To install the heater, as well as the gas and electrical supplies, in accordance with applicable specifications and codes. Rapid Engineering LLC recommends the installer contact a Local Building Inspector or Fire Marshal for guidance.

• To use the information given in a layout drawing and in the manual together with the cited codes and regulations to perform the installation.

• To install the heater in accordance with the clearances to combustibles.

Do not use equipment in area containing corrosive chemicals.

CAUTION

Product Damage Hazard

• To furnish all needed materials not supplied as standard equipment.

• To plan location of supports, vents and air intakes.

• To provide access for servicing.

• To provide the owner with a copy of this Installation, Operation and Service Manual.

• To never use heater as support for a ladder or other access equipment and never hang or suspend anything from heater.

• To ensure there is adequate air circulation around the heater and to supply air for combustion, ventilation and distribution in accordance with local codes.

• To ensure that the heater is placed in an approved application.

2.1 Wall Tag

A laminated wall tag is included with the heater as a

permanent reminder of the safety instructions and the importance of the required clearances to combustibles. Affix the tag by peeling off the backing of the adhesive strips on the rear surface and position the tag on a wall near the heater.

A copy of the wall tag (P/N 91040033) is illustrated

on the back cover. Know your model number and installed

configuration. Model number and installed configuration are found on the heater serial plate and throughout the Installation, Operation and Service Manual.

Refer to appropriate Material Safety Data Sheets (MSDS).

Failure to follow these instructions can result in product damage.

Rapid Engineering LLC cannot be responsible for ensuring that all appropriate safety measures are undertaken prior to installation; this is entirely the responsibility of the installer. It is essential that the contractor, the sub-contractor, or the owner identifies the presence of combustible materials, corrosive chemicals or halogenated hydrocarbons* anywhere in the premises.

* Halogenated Hydrocarbons are a family of chemical compounds characterized by the presence of halogen elements (fluorine, chlorine, bromine, etc.). These compounds are frequently used in refrigerants, cleaning agents, solvents, etc. If these compounds enter the air supply of the burner, the life span of the heater components will be greatly reduced. An outside air supply must be provided to the burners whenever the presence of these compounds is suspected. Warranty will be invalid if the heater is exposed to halogenated hydrocarbons.

2.3 National Standards and Applicable Codes

All equipment must be installed in accordance with the latest revision of the applicable standards and national codes. This refers also to the electric, gas and venting installation. Note: Additional standards for installations in public garages, aircraft hangars, etc. may be applicable. See Page 8, Section 5.

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Page 13

SECTION 3: CRITICAL CONSIDERATIONS

3.1 Basic Information

UHA[T][M][X][S] heaters have automatic ignition burners for ON/OFF, HIGH/LOW or modulate within the range of HIGH/LOW operation.

3.2 Manufactured Units

Gas-fired, power-vented unit heater with tubular heat exchanger. Units shall have a minimum of 82% thermal efficiency. The standard unit shall consist of a non-separated combustion design with an aluminized heat exchanger and single stage gas valve. Design and heat exchanger alternatives shall be offered as follows:

• Separated Combustion: [S] A separated combustion unit shall consist of a sealed enclosure with a hinged door. Combustion air inlet on rear of heater allows for intake venting from outside of heated space to be attached. Combustion flue gases shall be ducted from outside heated space by ductwork connected to unit’s outlet flange.

• Stainless Steel Heat Exchanger: [X] A stainless steel heat exchanger unit shall consist of heat exchanger tubes, heat exchanger tube supports and heat exchanger tube plate produced of 409 stainless steel. Air inlet temperatures below 40 °F (4.5 °C) are not recommended for this application.

• Two Stage Gas Valve: [T] A two-stage gas valve shall allow heater to function in either high or low fire.

• Modulating Gas Valve: [M] A modulating gas valve shall allow heater to modulate between high and low fire.

3.3 Location and Suspension

All models:

• Must be installed indoors.

• Must be installed in a level position with horizontal discharge.

• May be mounted on a shelf of non-combustible material.

• May be suspended from above (See Page 9, Figure ) or from wall brackets of sufficient strength to support the heater as listed in the Technical Data Table on Page 56, Section 16.2 and Page 58, Section 16.5.

SECTION 3: CRITICAL CONSIDERATIONS

• Drop rods must be a minimum of 3/8" diameter mild steel. Four suspension points (3/8" nuts) are located on top of the heater.

• Must be installed in a manner which allows access to all serviceable components.

3.4 Minimum Required Installation Clearances

Clearances around the heater and vent must be as indicated on Page 7, Figure 3 and Page 10, Section 7 to ensure access for servicing and correct operation.

3.5 Ventilation

It is important to ensure that there is adequate air space around the heater to supply air for combustion, ventilation and distribution in accordance with local and national codes on Page 10, Section 7.

3.6 Gas Supply

It is important that the gas supply pipe is sized correctly to provide the inlet pressure as stated on the heater serial plate. The gas supply pipe and electrical connections must not support any of the heater's weight. See Page 18, Section 9.

3.7 Electrical Supply

A permanent 120 V / 1 Ø / 60 Hz electrical supply is required for the main electrical power. The heater also requires suitable controls in accordance with Page 20, Section 10.

3.8 Vent

Choose heater orientation to allow for the proper location of the vent. Each heater must be fitted with a correctly sized sealed vent system.

If vented horizontally, no other equipment may be connected to the vent. See Page 10, Section 7.

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Page 14

UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 4: CLEARANCES TO COMBUSTIBLES

4.1 Required Clearances to Combustibles

WARNING

Fire Hazard

Keep all flammable objects, liquids and vapours the minimum required clearances to combustibles away from heater.

Some objects will catch fire or explode when placed close to heater.

Failure to follow these instructions can result in death, injury or property damage.

Clearances are the required distances that combustible objects must be away from the heater to prevent a fire hazard. Combustibles are materials that may catch on fire and include common items such as wood, paper, rubber, fabric, etc. Maintain clearances to combustibles at all times for safety. Clearances for all heater models are located on the serial plate of the heater and throughout the manual. Check the clearances on the serial plate to make sure the product is suitable for your application and the clearances are maintained. Read and follow the safety guidelines below:

• Keep gasoline or other combustible material including flammable objects, liquids, dust or vapors away from this heater or any other equipment.

• Do not spray aerosols in the vicinity of this heater.

exposure to combustible airborne materials or vapors.

4.2 Clearances to Combustibles

Clearances must be as indicated on Page 7, Figure

3. If clearances to combustibles are not indicated, then installation clearances apply.

• The stated clearances to combustibles

represents a surface temperature of 90° F (50° C) above room temperature. Building materials with a low heat tolerance (such as plastics, vinyl siding, canvas, tri-ply, etc) may be subject to degradation at lower temperatures. It is the installer’s and owner’s responsibility to assure that adjacent materials are protected from degradation.

• Maintain clearances from heat sensitive

equipment and workstations.

• Consult local Fire Marshal, Fire Insurance Carrier

or other authorities for approval of proposed installation when there is a possibility of

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Page 15

Figure 3: Installation Clearances and Clearances to Combustibles

Installation Clearances

Roof Terminal

(Optional separated

combustion concentric

venting shown.)

Top

(15 cm)

SECTION 4: CLEARANCES TO COMBUSTIBLES

Clearances to Combustibles

(15 cm)

31"**

(79 cm)

Wall

Terminal

24" (61 cm) for adequate air flow access axial fan.

(3 m)

18' (5.5 m) - 20' (6.1 m)

10'

(15 cm)

(8 cm)

Max. Mounting Height*

* Recommended mounting height varies with heater input.

Clearance to Vent: 2" (5 cm) Heaters may be mounted at a higher level if destratification fans are installed.

For Models UHA 150-400 venting directly from top of heater is

**31" (79 cm) minimum is necessary for servicing.

not applicable; For roof terminal vent, elbow duct off back of heater is required.

The heater must always be installed at least 6' (1.8 m) above the floor. The vent pipe must have clearance from combustibles by 2" (5 cm).

If installed at low levels where individuals can come in contact with hot heat exchanger components, adequate guarding must be provided.

All distances are minimum clearance requirments for service access, airflow and safety.

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Page 16

UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 5: NATIONAL STANDARDS AND APPLICABLE CODES

5.1 Gas Codes

The type of gas appearing on the serial plate must be the type of gas used. Installation must comply with national and local codes and requirements of the local gas company.

United States: Refer to NFPA 54/ANSI Z223.1 latest revision, National Fuel Gas Code.

Canada: Refer to CSA B149.1 Natural Gas and Propane Installation Code.

5.2 Aircraft Hangars

Installation in aircraft hangars must be in accordance with the following codes:

United States: Refer to Standard for Aircraft Hangars, NFPA 409 - latest revision.

Canada: Refer to Natural Gas and Propane Installation Code, Standard CSA B149.1 - latest revision.

5.4 Electrical

The heater must be electrically grounded in

accordance with the following codes:

United States: Refer to National Electrical

Code

, NFPA 70 - latest revision. Wiring must

conform to the most current National Electrical

Code

, local ordinances and any special

diagrams furnished.

Canada: Refer to Canadian Electrical Code, CSA C22.1 Part 1 - latest revision.

5.5 Venting

The venting must be installed in accordance

with the requirements within this manual and the following codes:

United States: Refer to NFPA 54/ANSI Z223.1 latest revision, National Fuel Gas Code.

Canada: Refer to CSA B149.1 Natural Gas and Propane Installation Code.

5.3 Parking Structures and Repair Garages

Installation in garages must be in accordance with the following codes:

United States: Refer to Standard for Parking Structures, NFPA 88A - latest revision or the Code for Motor Fuel Dispensing Facilities and Repair Garages, NFPA 30A - latest revision.

Canada: Refer to Natural Gas and Propane Installation Code, Standard CSA B149.1 - latest revision.

5.6 High Altitude

These heaters are approved (without modifications) for installations up to 2000' (610 m) in US and Canada. Heaters installed above 2000' (610 m) must be de-rated. For installations above 2000' (610 m) in US, consult factory for information on burner de-rating. For installations from 2000' (610 m) to 4500' (1370m) in Canada, high altitude conversion kits are available. Heaters installed over 4500' (1370 m) in Canada are not approved and must be approved by the local or provincial authority.

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Page 17

SECTION 6: HEATER INSTALLATION

6.1 General

Heaters are designed for installation above 6' (1.8 m). These heaters must be installed within the heated space. Duct delivery systems are not permitted with axial fan units. When handling or supporting the heater from below, ensure that the weight is taken at the support points.

The gas or electrical supply lines must not be used

to support the heater. Do not locate the gas or electrical supply lines directly over the path of the flue products from the heater.

The heater must be installed in a location that is

readily accessible for servicing.

The heater must be installed in accordance with

clearances to combustibles as indicated on the wall tag and in this manual.

Figure 4: Suspension Methods

SECTION 6: HEATER INSTALLATION

6.2 Suspension

WARNING

Crush Hazard

Use 3/8" threaded rod minimum.

Failure to follow these instructions can result in death, injury or property damage.

For typical suspension, See Page 9, Figure 4.

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Page 18

UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 7: VENTING

WARNING

Carbon Monoxide Hazard

Heaters must be vented outdoors.

Heaters must be installed according to the installation manual.

Failure to follow these instructions can result in death or injury.

7.1 Venting

This heater must be vented in accordance with the

rules contained in this manual and with the following national codes and any state, provincial or local codes which may apply: United States: Refer to NFPA 54/ANSI Z223.1 - latest revision, National Fuel Gas Code; Canada: Refer to CSA B149.1 Natural Gas and Propane Installation Code.

The bottom of the vent or air intake terminal shall not

be located less than 1' (.3 m) above grade level.

The vent shall not terminate less than 7' (2.1 m)

above grade where located adjacent to public walkways.

Vent terminal must be installed at a height sufficient

to prevent blockage by snow and building materials protected from degradation by flue gasses.

Vent terminal must be beyond any combustible

overhang. Secure all joints with corrosion resistant #8 x 3/8"

sheet metal screws. For single wall venting, pressure sensitive aluminum

tape or silicone sealant must be used to seal all joints.

Aluminum tape shall have a minimum temperature

rating of 400° F (204° C) and meet SMACNA AFTS100-73 standards. High temperature silicone sealant must have a minimum temperature rating of 480° F (250° C).

7.1.1 United States Requirements

Vent must terminate at least 3' (.9 m) above any

forced air inlet located within 10' (3.1 m).

Vent must terminate at least 4' (1.2 m) below,

4' (1.2 m) horizontally from, or 1' (.3 m) above any door, operable window, or gravity air inlet into any building.

NFPA 54/ANSI Z223.1 - latest revision, National Fuel Gas Code specifies a 4' (1.2 m) horizontal vent terminal clearance from gas and electric meters,

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regulators and relief equipment.

7.1.2 Canadian Requirements

The vent shall not terminate within 6' (1.8 m) of a mechanical air supply inlet to any building.

The vent shall not terminate within 3' (.9 m) of a window or door that can be opened in any building, any non-mechanical air supply inlet to any building, or of the combustion air inlet of any other piece of equipment.

7.2 Vent Installation

Maintain clearances to combustibles at all times for safety. Clearances are the required distances that combustible objects must be away from the heater to prevent serious fire hazard. See Page 7, Figure 3. For vented units, the vent must terminate outside of the building.

Vents must be fully sealed and correctly sized for the model. If the vent passes through a wall or ceiling of combustible material, it must be enclosed by a listed thimble and be separated from the thimble by at least a 2" (5 cm) air gap.

For separated combustion models, vents and air intakes must be a fully sealed system and correctly sized for the model. Vent should be assembled as detailed on Page 12, Figure 5 through Page 16, Figure 10. The joints between the vent terminal and the roof or wall must be properly sealed. If the vent passes through a wall or ceiling of combustible material, it must be enclosed by a listed thimble and be separated from the thimble by at least a 2" (5 cm) air gap.

Vents and air intakes must be adequately

supported so that the heater does not bear the weight of the pipes.

For vent termination See Page 12, Figure 5 through Page 16, Figure 10.

7.2.1 Standard Vented Heaters (Models UHA[T][M][X] 150-400)

The vent must be fitted with a low resistance

terminal. See Page 12, Figure 5 through Page 14, Figure 7. Standard vented heaters do not allow outdoor air intake for combustion air.

7.2.2 Separated Combustion Heaters (Models UHA[T][M][X]S 150-400)

The heaters are designed to be installed as

separated combustion heaters. The vent and air intake are run as separate pipes to the wall or roof terminals. See Page 15, Figure 8. As an option, the vent and air intake are run as separate pipes to a

Page 19

concentric vent box and a concentric vent/air intake pipe penetrates the wall or roof. See Page 15, Figure 9 and Page 16, Figure 10.

For separated combustion installation, the vent and air intake must be fitted with an individual and correctly sized sealed system and the vent and air intake must terminate at approved wall and roof terminals. Separated combustion units may not be common vented.

SECTION 7: VENTING

Completely seal all joints, refer to Page 10, Section

7. 2 . If penetrating a combustible wall or roof, a listed thimble with 2" (5 cm) clearance must be used. Where local codes permit, a single section of type B-1 vent material may be used at the roof or wall penetration instead of a thimble. Ensure vent manufacturer's clearance from vent material is maintained. Seal annular space of the type B-1 vent as well as all joints in the remaining vent.

7.3 Horizontal Venting

Horizontally vented heaters must be individually vented, no common venting.

Vent pipe must be sloped ¼" (.6 cm) for every 1' (.3

m). In noncombustible walls only, vent terminal (P/N 02537801-1P) may be used.

For 4'' (10 cm) vents in either combustible or noncombustible walls, use vent terminal (P/N

90502100) or equivalent insulated vent terminal. Follow the manufacturer's instructions for proper installation.

Instead of an insulated vent terminal, a listed thimble with 2" (5 cm) air gap, may be used with a 4" (10 cm) vent cap (P/N 90502102).

7.4 Vertical Venting

Vertically vented standard vented heaters can be

common vented (up to 4 heaters).

Vent pipe must be sloped 1/4'' (.6 cm) for every

1' (.3 m). For 4'' (10 cm) common vent, an approved vent cap

(P/N 90502102) must be used. For 6'' (15 cm) common vent, an approved vent cap

(P/N 90502103) must be used. For common vertical venting of more than two

heaters, See Page 14, Figure 7.

A vent shall not extend less than 2' (.6m) above the

highest point where it passes through a flat roof of a building.

7.5 Maximum Vent Lengths Table

Model UHA[T][M][X][S]150-400 # of Elbows

30 ft (9.1 m) 1

25 ft (7.6 m) 2 20 ft (6.1 m) 3 15 ft (4.5 m) 4 10 ft (3.0 m) 5

7.6 Vent Material

Vent material may be single wall 26 ga. (minimum)

galvanized steel or equal thickness stainless steel.

7.7 Replacing an Existing Heater in a Venting System

When replacing an existing heater in a venting system, the venting system may not be properly sized to vent the new heater. The following steps must be followed with each piece of equipment connected to the venting system placed in operation, while any other equipment connected to the venting system are not in operation.

1. Seal any unused openings in the venting system.

2. Inspect the venting system for proper size and horizontal pitch, as required by the NFPA 54/ ANSI Z223.1 - latest revision, National Fuel Gas Code (US) or Standard CSA B149.1 Natural Gas and Propane Installation Code (Canada) and these instructions. Determine that there is no blockage or restriction, leakage, corrosion and other deficiencies which could cause an unsafe condition.

3. Close all building doors and windows and all doors between the space in which the piece(s) of equipment connected to the venting system are located and other spaces of the building. Turn on clothes dryers and any exhaust fans, such as range hoods and bathroom exhausts so that they shall operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers.

4. Follow the lighting instructions. Place the equipment being inspected in operation. Adjust thermostat so that the equipment will operate continuously.

5. For any equipment having a draft hood, test for draft hood equipment spillage at the draft hood relief opening after five minutes of main burner operation. Use the flame of a match or candle.

6. After it has been determined that each piece(s) of equipment connected to the venting system properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace

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UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

dampers and any other gas-burning piece(s) of equipment to their previous conditions of use.

7. If improper venting is observed during any of the above tests, the venting system must be corrected by a contractor qualified in the installation and service of gas-fired equipment or your local gas supplier. If the venting must be resized, use appropriate tables in (US)

Appendix G of NFPA 54/ANSI Z223.1 - latest

revision, National Fuel Gas Code (US) or Standard CSA B149.1 Natural Gas and Propane Installation Code (Canada) to determine minimum size. All vent corrections must be in accordance with the appropriate local codes and the NFPA 54/ANSI Z223.1 latest revision, National Fuel Gas Code (US) or Standard CSA B149.1 Natural Gas and Propane Installation Code (Canada).

Figure 5: Vent and Roof Detail

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Page 21

Figure 6: Standard Vented Heater - Vertical and Horizontal Vent Termination

Vent Termination

SECTION 7: VENTING

Flashing (By Others)

12" (31 cm) Minimum from roof to vent termination

Listed thimble

through combustible roof

Vent

Vertical

Option

90° Bend

Vent

Model Vent Diameter Part Number

UHA[T][M][X] 150-400 4" (10 cm) 90502102

Horizontal

Option

Listed thimble through combustible wall

Flashing (By Others)

Vent Termination

12" (31 cm) Minimum from wall to vent termination

NOTE: Vent supports not shown.

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UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Figure 7: Standard Vented Heater - Common Vertical Vent Termination

Type "B" vent cap (7" [18 cm] or 8" [20 cm]) may be

SIDE VIEW

2'(.6 m)

Minimum

used. (These are not available from the manufacurer.)

Type "B" Vent Pipe

Roof

Flashing

Roof

The last section of vent pipe passing through the roof or wall may be Type "B" vent pipe. All other vent materials in the building must be single wall vent pipe.

4" (10 cm)

Single Wall Pipe

TOP VIEW

"D"

Approved

Thimble

(If Applicable)

Single Wall Pipe

"D" Area must equal sum

of open area of

individual vents.

4" (10 cm)

Single Wall Pipe

Requirements:

• Maximum of four heaters can be commonly vented through the roof.

• Heaters must be of the same BTU output.

• Heaters must be controlled by a common thermostat.

• Connections to a common stack must be positioned to avoid direct opposition between streams of

combustion gases.

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Page 23

Figure 8: Separated Combustion Heater - Vertical and Horizontal Vent Termination

SECTION 7: VENTING

Model **Vent Diameter Part Number

UHA[T][M][X]S 150 - 400 4" (10 cm) 90502102

Model *Air Intake Diameter Part Number

UHA[T][M][X]S 150 - 250 4" (10 cm) 90502102 UHA[T][M][X]S 300 - 400 5" (13 cm) 90502105

Figure 9: Concentric Vent Box

4" (10 cm) or 5" (13 cm)

Seal joint between single wall and Type B vent with silicone sealant.

Combustion Air to Heater

Exhaust from Heater

4" (10 cm) Single Wall Vent Pipe (By Others)

Use 3 sheetmetal screws equally spaced around joint.

One piece of 4" (10 cm) diameter, 1/4" (6 cm) airspace type

“B” vent. Selkirk Model RV or equivalent. (By others)

6" (15 cm) or 8" (20 cm) Single Wall Inlet Air Pipe

Concentric Vent Box

Use 3 sheetmetal screws equally spaced around collar.

(By Others)

Toward Outside

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UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Figure 10: Concentric Vertical and Horizontal Vent Termination - Separated Combustion Heater

4" (10 cm)

Type B-1Vent

Vent Terminal with Baffle Plate

Combustion Air Terminal

UHAS 150-250: 6" (15 cm) Diameter Single Wall UHAS 300-400: 8" (20 cm) Diameter Single Wall

Flashing (By Others)

Concentric Vent Box

Air Intake*

Vertical

Option

10' (3 m)

Maximum

6" (16 cm) Minimum 12" (31 cm) Maximum

Storm Collar (By Others) (Attach with 3 sheet metal screws)

12" (31 cm) Minimum from roof to combustion air terminal

Vent**

Air Intake*

Horizontal Option

12" (31 cm) Minimum from wall to combustion air terminal

6" (16 cm)

Minimum

12" (31 cm)

Maximum

(10 cm)

Type

B-1

Vent

Vent Terminal with Baffle Plate

Vent**

Concentric Vent Box

Description Part Number Qty. Concentric Vent Kit (150 - 250) UHVK1

Concentric Vent Box Top & Side Assembly 90504113 1 Concentric Vent Box Bottom Assembly 90504112 1 Screw #6 x 3/8 Self Drilling 91119100 14 4" Vent Terminal with Baffle Plate 90502102R 1 6" Combustion Air Terminal 90502103 1

Description Part Number Qty. Concentric Vent Kit (300 - 400) UHVK2

Concentric Vent Box Top & Side Assembly 90504013 1 Concentric Vent Box Bottom Assembly 90504012 1 Screw #6 x 3/8 Self Drilling 91119100 14 4" Vent Terminal with Baffle Plate 90502102R 1 8" Combustion Air Terminal 90502104 1

Combustion Air Terminal

Storm Collar (By Others) (Attach with 3 sheet metal screws)

Flashing (By Others)

Model **Vent Diameter

UHA[T][M][X]S 150 - 400 4" (10 cm)

Model *Air Intake Diameter

UHA[T][M][X]S 150 - 250 4" (10 cm) UHA[T][M][X]S 300 - 400 5" (13 cm)

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Page 25

SECTION 8: AIR SUPPLY

WARNING

Explosion Hazard

Equipment must have access to uncontaminated air at all times.

Failure to follow these instructions can result in death, injury or property damage.

8.1 Separated Combustion Installation

When installed as a separated combustion heater

(UHA[T][M][X]S), the air for combustion is drawn in from outside the building. It is important to ensure that there is adequate space around heater to provide air for the axial air distribution fan.

SECTION 8: AIR SUPPLY

8.2 Building Ventilation

Where ventilation is required, air must be taken from

an outside point where it is not likely to be contaminated or obstructed.

8.3 Outside Combustion Air Supply

If outside combustion air supply is required, separated combustion model (UHA[T][M][X]S) heaters must be used.

Caution: If the building has a slight negative pressure or corrosive contaminants such as halogenated hydrocarbons are present in the air, an outside combustion air supply to the heater is required. Seal all combustion air pipe joints. The outside air terminal must not be more than 1' (31 cm) above the vent terminal.

8.3.1 Length Requirements

Follow the constraints listed on Page 11, Section 7.5.

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UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 9: GAS PIPING

Canada: Rubber type 1 gas hose (Canadian

WARNING

Fire Hazard

Connect gas supply according to Figure 11.

Do not use gas supply pipe and electrical connections to support the heater’s weight.

Gas can leak if not installed properly.

Failure to follow these instructions can result in death, injury or property damage.

WARNING

Explosion Hazard

Leak test all components of gas piping before operation.

Gas can leak if piping is not installed properly.

Do not high pressure test gas piping with heater connected.

Failure to follow these instructions can result in death, injury or property damage.

A gas meter is connected to the service pipe by the

gas supply company. An existing meter should be checked, preferably by the company, to ensure that the meter is adequate for the rate of gas supply required.

Installation pipes must be fitted in accordance with local and national codes. Pipes of smaller size than the heater inlet gas connection should not be used.

Gas lines must meet applicable codes: United States: Flexible stainless steel gas hose

(US models) is certified per the standard for connectors for gas equipment, ANSI Z21.21/CSA

6.10 - latest revision.

models) is certified as being in compliance with the standard for elastomeric composite hose and hose couplings for conducting propane and natural gas, CAN/CGA 8.1 - latest revision.

9.1 Connections

Connect the heater to the gas supply ensuring that the final connections are as follows:

• Gas supply pipe work is run in medium or heavy gauge tubing in compliance with local and national codes.

• Meter and service must be large enough to handle all the burners being installed plus any other connected load. The gas pipe which feeds the system must be large enough to supply the required gas with a maximum pressure drop of 1/2 in wc. When gas piping is not included in the layout drawing, contact the local gas supplier.

• An isolating valve and union connection should be used and fitted into the supply adjacent to the heater.

• A minimum 1/8" NPT plugged tapping accessible for test connection must be installed immediately upstream of the gas supply connection to the heater.

• For suspended heaters, an approved metal flexible connection between the isolating valve and the heater may be used. To reduce

pressure loss, use one pipe size larger than the heater gas connection.

IMPORTANT - The complete installation must be

purged and tested for gas soundness in accordance with local and national codes.

Caution: Do not high pressure (in excess of 1/2 psi [14 in wc]) test the gas piping with the burner connected. Close manual shut-off valve during any pressure testing equal to less than 1/2 psi (14 in wc).

Check the pipe and tubing ends for leaks before placing heating equipment into service. When checking for gas leaks, use a soap and water solution; never use an open flame.

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Page 27

Figure 11: Gas Connection

• Do not twist flexible gas connector.

• Ensure all joints are gas tight.

CAUTION

Product Damage Hazard

Hold gas nipple securely with pipe wrench when attaching flexible gas connector.

Failure to follow these instructions can result in product damage.

Gas Shut-off Valve

SECTION 9: GAS PIPING

Option A:

Stainless Steel Flexible Gas Connector

Option B:

Medium or Heavy Gauge Pipe Gas Connector

Union

Connection

Drip Leg

Cap

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UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 10: WIRING

DANGER

Electrical Shock Hazard

Disconnect electric before service.

More than one disconnect switch may be required to disconnect electric from equipment.

Equipment must be properly grounded.

Failure to follow these instructions can result in death or electrical shock.

All heater models require constant 120 V / 1Ø / 60

Hz power supply. Check heater serial plate for electrical rating for proper circuit sizing. For servicing, a disconnect switch of proper electrical rating should be installed in the vicinity of the heater.

All heaters are equipped with thermostat

connections suitable to power a 24 V thermostat. Heater must be wired and electrically grounded in

accordance with local codes. In the absence of local codes in accordance with: United States: refer to

National Electrical Code Canada: refer to Canadian Electrical Code CSA C22.1 Part I - latest revision.

NFPA 70 - latest revision

10.1.1 Fan Control

The heater’s axial fan can be used during the off-

season for air circulation. A low voltage programmable thermostat with fan switch (P/N

90425400) must be used. For thermostat connection details See Page 21, Section 10.2.

10.1 Positioning Thermostats

A room thermostat should be mounted on a

vibration-free wall or column at a height of approximately 5' (1.5 m) from the floor to measure the ambient temperature. It should be clear of both cold drafts and the direct path of warm air from the heater.

Avoid mounting thermostat on outside walls or in

areas directly exposed to radiant heat or sunlight. Install wall tag in a visible location near thermostat. See Page 4, Section 2.1 for wall tag details.

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Page 29

10.2 Low Voltage Thermostat for Models UHA[T][M][X][S] 150-400

NOTE: Models 300-400 have two

axial fans.

NOTE: Electrical supply is located below terminal strip.

SECTION 10: WIRING

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UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

10.3 UHA[X][S] Series Internal Wiring Diagram for Single Stage Gas Valves

NOTE:

For field wiring into service junction box, or if any of the original wire supplied with the heater must be replaced, it must be replaced with wiring material having a temperature rating of at least 221° F (105° C) and 600 volts. For supply connections use No. 14 AWG or larger wires.

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Page 31

10.4 UHA[X][S] Series Ladder Wiring Diagram for Single Stage Gas Valves

SECTION 10: WIRING

NOTE:

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UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

10.5 UHA[T][X][S] Series Internal Wiring Diagram for Two Stage Gas Valves

HIGH/LOW CONTROL

HIGH

COMMON

LOW

NOTE:

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Page 33

10.6 UHA[T][X][S] Series Ladder Wiring Diagram for Two Stage Gas Valves

HIGH

STAGE

SECTION 10: WIRING

NOTE:

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UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

10.7 UHA[M][X][S] Series Internal Wiring Diagram for Modulating Gas Valves

NOTE:

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10.8 UHA[M][X][S] Series Ladder Diagram for Modulating Gas Valves

SECTION 10: WIRING

NOTE:

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UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

10.9 Electrical Connection to the Heater

Note: Junction box is not provided with heater.

Conduit can also be attached directly to heater with wire junction made within the heater cabinet.

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Page 37

SECTION 11: OPERATION AND MAINTENANCE

DANGER

Electrical Shock Hazard

Disconnect electric before service.

Heater must be connected to a properly grounded electrical source.

Failure to follow these instructions can result in death, electric shock, injury or property damage.

Read this manual carefully before installation, operation, or service of this equipment. All components are accessed via the hinged door. Opening the door exposes live electrical connections and hot components. Prior to any maintenance or service of the heater, shut off, lockout and tagout the electrical disconnect and gas valve that supplies the unit in accordance with OSHA regulations.

Explosion Hazard

Turn off gas supply to heater before service.

WARNING

Burn Hazard

Allow heater to cool before service.

Tubing may still be hot after operation.

11.1.2 Electrical Checks

1. Check that all site wiring is connected in

accordance with the appropriate wiring diagram on Page 22, Section 10.3, Page 24, Section

10.5 or Page 26, Section 10.7.

11.1.3 Gas Supply

All aspects of the gas installation including the gas meter must be inspected, tested for gas tightness and purged in accordance with local and national codes.

Ensure that the air is fully purged from the heater inlet pipe up to the main gas valve inlet test nipple.

Cut/Pinch Hazard

Wear protective gear during installation, operation and service.

Edges are sharp.

Severe Injury Hazard

Turn off gas and electrical supply before service.

Fan can start automatically at any time.

Failure to follow these instructions can result in severe injury or product damage.

11.1 Pre-Start-Up Checks

All pre-start-up checks must be carried out before

lighting the heater. Ensure that the heater and all controls are suitable

for the gas, pressure and electrical supply to which they are to be connected.

11.1.1 Louvers

Where fitted, the air delivery louvers need to be set

during start-up to give the required air distribution.

11.1.4 Mechanical Checks

1. Check that the fan(s) are free to run and

delivery louvers are turned to give required air deflection.

2. Check that the flue (and air intake for separated

combustion units) is installed in accordance with the instructions in this manual and local regulations. See Page 10, Section 7.

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UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

11.2 Begin Start-Up

11.2.1 Before Operating the Heater

To ensure that all the controls are in safe working

order, operate the heater for the first time with the isolating gas valve turned off and power supply turned on.

1. Turn off the isolating gas valve.

2. Turn up the thermostat above room temperature. The automatic ignition sequence will now begin as described on Page 30, Figure 12.

There will be no ignition of the burner and lockout

will occur, which proves the controls are operating correctly.

Figure 12: Automatic Burner Control Sequence

Burner Sequence for Ignition Control

START

Thermostat 24 V

RUN

SHUT DOWN

Flue Blower

Pressure

Switch

Ignition Spark

Start Gas Valve

Flame Signal

Axial Fan

*Purge time begins at pressure switch change over.

Required Incoming Signals

Signals Output By Control

30 Seconds Purge*

ts = 10 Seconds

30 Seconds Delay 90 Seconds Delay

If at any stage the flame fails, the control will retry for ignition. The control has four trials for ignition before a one hour lockout.

30 Seconds Post Purge

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Page 39

Figure 13: Single Stage Gas Valve for Models UHA[X][S] 150 - 400

Regulator

SECTION 11: OPERATION AND MAINTENANCE

TOP VIEW

END VIEW

½PSI IN

Gas Inlet

Description Part Number

Gas Valve 150 - 250 NG 90032505 Gas Valve 150 - 250 LP 90032506 Gas Valve 300 - 400 NG 90032520 Gas Valve 300 - 400 LP 90032521

Figure 14: Two Stage Gas Valve for Models UHA[T][X][S] 150 - 400

OFF

Outlet Pressure

Gas Inlet

END VIEW

Inlet Pressure

TOP VIEW

Regulator

½PSI IN

OFF

Outlet Pressure

Description Part Number

Gas Valve 150 - 250 NG 90032530 Gas Valve 150 - 250 LP 90032531 Gas Valve 300 - 400 NG 90032532 Gas Valve 300 - 400 LP 90032533

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UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Figure 15: Modulating Gas Valve for Models UHA[M][X][S] 150 - 400

Description Part Number

Gas Valve 150 - 250 NG 90032505 Gas Valve 150 - 250 LP 90032506 Gas Valve 300 - 400 NG 90032520

Gas Valve 300 - 400 LP 90032521 1/2" Exa Valve 150-250 90032550 3/4" Exa Valve 300-400 90032551

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11.2.2 Start-Up the Gas Valve (All Gases)

11.2.2.1 Check Burner Gas Pressure (Single Stage)

1. Remove the plug in the outlet (burner) pressure test point and connect a pressure tap and a manometer. Page 31, Figure 13.

2. With the burner firing, measure the pressure on the manometer. To adjust the burner pressure, remove the regulator cover from the valve and turn the regulator adjustment screw to set the required burner pressure as stated in the Technical Data Table for the correct gas and model on Page 56, Section 16.3 and Page 58, Section 16.6.

11.2.2.2 Check Burner Gas Pressure (Two Stage)

1. Remove the plug in the gas valve outlet pressure test point and connect a pressure tap and a manometer. See Page 31, Figure 14.

2. With the unit operating in high fire or low fire, measure the outlet pressure on the manometer. Measure burner pressure in both operating modes. To adjust the burner pressure, remove plastic cover from regulators and adjust High and/or Low regulators as needed. Required burner pressures are indicated in the Technical Data Table for the correct gas and model on Page 56, Section 16.3 and Page 58, Section

16.6.

3. To set the high fire rate, adjust the high fire adjustment on the gas valve. To set the low fire rate (with the unit running in low fire), adjust the low fire adjustment on the gas valve.

11.2.2.3 Check Burner Gas Pressure (Modulating)

1. Loosen screw in outlet pressure tap shown on Page 32, Figure 15 and connect manometer. Gas pressure is NOT measured at Honeywell single stage gas valve.

2. With burner firing, measure pressure on manometer. To measure high fire burner pressure, disconnect modulating thermostat signal and apply 10 VDC to modulating input connections (polarity sensitive). To adjust high fire burner pressure, remove regulator cover from Honeywell single stage gas valve and turn regulator adjustment screw to set required burner pressure as stated in the Technical Data Table for the correct gas and model on Page 56, Section 16.3 and Page 58, Section 16.6.

SECTION 11: OPERATION AND MAINTENANCE

3. To measure low fire burner pressure disconnect 10 VDC signal to modulating valve.

NOTE: Low fire burner pressure is set at factory and not field adjustable. (modulating)

NOTE: If the correct burner pressure cannot be reached, then check the inlet pressure to the valve with the burner firing. See Technical Data Table on Page 56, Section 16.3 and Page 58, Section 16.6 for inlet pressure requirement.

Do not continue to adjust the regulator if the pressure is not changing.

If the inlet pressure is too low to allow correct burner pressure setting, then the gas inlet pressure must be corrected before completing the start-up.

11.2.2.4 Check Gas Rate (Single and Two Stage)

1. After burner pressure adjustment, allow the heater to operate for at least 15 minutes and then re-check settings. Adjust pressure setting if necessary.

2. Check gas flow rate at gas meter. NOTE: For two stage valve (High/Low operation) check gas flow in both operating modes.

3. Turn off heater and electrical supply.

4. Remove the manometer and refit all covers to the valve and tighten the screw of the outlet pressure tap.

11.2.2.5 Check Gas Rate (Modulating)

1. After burner pressure adjustment, allow heater to operate for at least 15 minutes and then recheck settings. Adjust pressure setting if necessary.

2. Check high/low fire gas flow rate at gas meter. To place heater into high fire, disconnect modulating thermostats signal and apply 10 VDC to modulating input connections.

3. To place heater into low fire, disconnect 10 VDC from modulating input connections.

4. Turn off heater and electrical supply.

5. Remove manometer, tighten outlet pressure tap screw and replace modulating thermostat signal wires.

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UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

11.3 Pressure Switch

The pressure switch is factory pre-set for each

model and is not adjustable.

11.4 Turning Off the Heater

Set the thermostat to the "OFF" position or lowest setting and the main burner will stop.

The fan(s) will continue to run until it is stopped

automatically by the fan thermostat.

Do not use a disconnect switch for control of heater. Disconnect switch will turn off the fan. Heat exchanger could be damaged. Warranty will not cover damage to the heat exchanger if operated improperly. Only use the disconnect switch for turning off heater for service or during off-season.

11.5 External Controls

External controls may include time switch, interlock switch, room thermostat and frost thermostat. Operate each control to ensure that they function correctly. Set the switches (if fitted) and thermostat(s) to the users’ requirements.

11.6 Complete the Start-Up

Ensure that all covers are fitted correctly and all test points are properly sealed.

11.7 Instruction to the User

Explain the controls of the heater to the user including how to turn it on and off, using the controls equiped on site.

Give this manual to the user. Ensure that the user is shown and understands the

importance of maintaining clearances to combustibles on Page 7, Figure 3, installer responsibility on Page 4, Section 2 and user instructions on Page 35, Section 12 and all warnings defined in this manual.

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Page 43

SECTION 12: USER INSTRUCTIONS

DANGER

Electrical Shock Hazard

Disconnect electric before service.

Heater must be connected to a properly grounded electrical source.

Failure to follow these instructions can result in death, electric shock, injury or property damage.

The UHA[T][M][X][S] Series heaters are fully

automatic and operate from the external controls fitted on site.

12.1 Heater Operation

When the heater has been switched on by the

thermostat installed on site, the main burner will automatically turn on.

The burner control box will control the safe ignition

of the flame. If equiped with two stage gas valve, the heater may

start in low or high fire. If equiped with a modulating gas valve, heater will

start at firing rate called for by modulating thermostat. Heater will continue to run at firing rate called for by thermostat, with 10 VDC being maximum rate and 0 VDC being minimum rate. ON/OFF control is provided by thermostat R and W connections. See Page 21, Figure 10.2.

All heaters require a constant gas and electricity

supply which must not be interrupted during the normal operation of this heater.

12.2 Lighting Instructions

12.2.1 To Turn On Heater

1. Ensure that the electrical and gas supplies to the heater are on. Check that the on site controls are "ON".

IMPORTANT: The thermostat setting must be above the ambient temperature for the heater to operate.

2. The automatic firing sequence will begin as described on Page 30, Figure 12. The heater will now operate automatically under the control of the on site controls.

12.2.2 To Turn Heater Off

Set the thermostat to the "OFF" position.

Explosion Hazard

Turn off gas supply to heater before service.

WARNING

Burn Hazard

Allow heater to cool before service.

Tubing may still be hot after operation.

The burner will turn off immediately. The fan will continue to run for 90 seconds. To restart, turn the thermostat on or above room

temperature.

12.3 Simple Troubleshooting

Some possible reasons for the heater not operating are:

1. Gas supply not "ON".

2. Electricity supply not "ON".

3. The time and/or temperature controls are not "ON".

4. A limit switch may have operated. This may be caused by an interruption of the electrical supply, failure of the distribution fan or vent or heat exchanger blockage.

If a temperature limit switch persistently trips, there is a fault which must be investigated by a contractor qualified in the installation and service of gas-fired heating equipment.

12.3.1 Simple Troubleshooting (Burner Fault)

If the burner fails to ignite for any reason, it will retry for ignition (four trials total). After four unsuccessful ignition trials, the control will put the heater into lockout for one hour.

Lockout should not occur during normal operation of the heater and indicates there is a fault condition which must be corrected. There is an LED light on the ignition control that flashes codes to assist in fault correction. See Page 36, Figure 16 for LED indication codes.

Cut/Pinch Hazard

Wear protective gear during installation, operation and service.

Edges are sharp.

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Page 44

UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Figure 16: LED Diagnostic Codes

LED INDICATION FAULT MODE

Slow Flash Normal Operation - No call for heat.

Fast Flash Normal Operation - Call for heat.

2 Flashes Ignition Lockout - No flame detected.

3 Flashes Airflow Fault - Pressure switch open or closed.

4 Flashes Temperature Limit Switch Open

5 Flashes Flame Sense Error - Gas valve not energized.

Steady On Internal Control Failure

36 of 59

Page 45

SECTION 13: SERVICING

DANGER

Electrical Shock Hazard

Disconnect electric before service.

Heater must be connected to a properly grounded electrical source.

Failure to follow these instructions can result in death, electric shock, injury or property damage.

13.1 Servicing Instructions

After start-up, the heater will require maintenance to

be carried out, at a minimum, annually. If the heater is used in a dirty or dusty area, more frequent maintenance may be required.

Explosion Hazard

Turn off gas supply to heater before service.

WARNING

Burn Hazard

Allow heater to cool before service.

Tubing may still be hot after operation.

IMPORTANT: Check all gas pipes and pipe joints to

ensure there are no cracks or gas leaks. Any cracks in the pipes or pipe joints must be repaired.

IMPORTANT: Inspect all suspended components and hardware. Ensure that they are in good condition, properly tightened, and corrosion free.

Cut/Pinch Hazard

Wear protective gear during installation, operation and service.

Edges are sharp.

Severe Injury Hazard

Turn off gas and electrical supply before service.

Fan can start automatically at any time.

Failure to follow these instructions can result in severe injury or product damage.

IMPORTANT: Prior to any maintenance or service of

the heater, shut off, lockout and tagout the electrical disconnect and gas valve that supplies the unit in accordance with OSHA regulations. After any maintenance or repair work, always test fire the heater in accordance with the start-up instructions on Page 29, Section 11 through Page 34, Section

11.7 to help ensure all safety systems are in working order before leaving the heater to operate. Minor faults may be traced by using the troubleshooting charts on Page 41, Section 14 through Page 45, Section 14.5.

13.2 Burner Maintenance

13.2.1 Burner Maintenance for Models 150-400

1. Open the hinged door and remove from the hinges. Set door aside. See Page 47, Section

15.2.

2. Remove the filler panel (10 screws) to fully access the burner assembly. See Page 47, Section 15.2.1.

3. Remove burner assembly from cabinet via six screws. See Page 47, Section 15.2.1. Electrode and flame probe should remain attached.

4. Remove manifold from burner assembly via four screws, two on top and two on bottom. See Page 48, Section 15.2.2. Clean any deposits from the main burner which may have formed in the injectors or venturi of the burner.

5. Chech condition of ignition electrode and flame probe. Clean off any deposits which may have formed, check condition of ceramic insulators. Replace as required. See Page 49, Section

15.3.

13.3 Fan/Motor Assembly Maintenance

The main fan bearings are permanently sealed and do not need lubrication. Before cleaning, turn off gas

37 of 59

Page 46

UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

and electrical supply. Remove the fan(s) and use a small brush or duster to clean the fan blades from each side. Replace fan when done. See Page 53, Section 15.10.

13.4 Heat Exchanger Maintenance

The heat exchanger will remain clean unless a

problem has developed with combustion. Inspect the heat exchanger. Look for signs of overheating at the front tubes which may indicate burner over firing or persistently low air flows.

13.5 Gas Valve Maintenance

No regular maintenance is required on this device.

To change gas control valves, See Page 46, Section

15.1.

Do not repair or disassemble gas valve.

Replace faulty gas valves with genuine replacement parts sold and supplied by Rapid Engineering LLC.

13.6 Flue Blower

The flue blower should not require maintenance.

However, if the air pressure switch is causing burner lockout, then remove the flue blower from the vent box by unscrewing the screws at the mounting plate. Screw quantity will vary by model size. Remove the screws attaching the mounting plate to the fan inlet See Page 51, Section 15.6 through Page 52,

Section 15.7. Ensure that the fan is free to run and that the fan wheel is clean.

13.7 Venting and Air Intake Pipe

Inspect all venting and air intake pipe. Ensure that all seams are sealed and suspension points secure. Repair suspension points if any part of the venting or combustion air pipe is sagging. Check to make sure any insulation is not missing or in poor condition. Replace as necessary. Check all venting and air intake components to ensure they are in good condition, gas tight and corrosion-free.

13.8 Maintenance Checklist Installation Code and Annual Inspections: All

installations and service of RAPID

equipment must be performed by a contractor qualified in the installation and service equipment sold and supplied by Rapid Engineering LLC and conform to all requirements set forth in the RAPID

manuals and all applicable governmental authorities pertaining to the installation, service, operation and labeling of the equipment.

To help facilitate optimum performance and safety,

Rapid Engineering LLC recommends that a qualified contractor conduct, at a minimum, annual inspections of your RAPID

equipment and perform service where necessary, using only replacement parts sold and supplied by Rapid Engineering LLC.

Annual Fall Start-Up Follow entire start-up procedure at this time and check control settings and

operation.

The Vicinity of the Heater Do not store or use flammable objects, liquids or vapors near the heater.

Immediately remove these items if they are present.

See Page 5, Section 3.

Vehicles and Other

Objects

Maintain the clearances to combustibles.

Do not hang anything from, or place anything on, the heater.

Make sure nothing is lodged in between the heat exchanger or in the louvers.

Immediately remove objects in violation of the clearances to combustibles.

See Page 6, Section 4.

Vent Pipe/Terminals Venting must be intact. Using a flashlight, look for obstructions, cracks on the

pipe, gaps in the sealed areas or corrosion.

The area must be free of dirt and dust.

Remove any carbon deposits or scale using a wire brush.

If the vent terminal has a screen built in, remove any dirt, dust or deposits from the screen.

See Page 10, Section 7 through Page 17, Section 8.

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Page 47

SECTION 13: SERVICING

Cabinet Exterior After installation, touch up scratches. Periodic paintings should be done

thereafter as required. Warning labels and logo labels should be legible and

accurate. Please contact Rapid Engineering LLC or RAPID

independent dis-

tributor if you need replacement warning labels or logo labels.

See Page 2, Figure 1 through Page 3, Figure 2.

Combustion Air Intake Pipe

Intake pipe and inlet must be intact. Look for obstructions, cracks on the pipe, gaps in the sealed areas or corrosion.

The area must be free of dirt and dust.

Clean and reinstall as required.

See Page 17, Section 8.

Heat Exchanger Make sure there are no cracks.

Make sure there is no sagging, bending or distortion.

Clean or replace as required.

Gas Line and Shut-off

Valves

Burner Observation

Window

Flue Blower Scroll, Wheel

Check for gas leaks.

See Page 18, Section 9.

Make sure it is clean and free of cracks or holes.

Clean and replace as required.

Compressed air or a vacuum cleaner may be used to clean dust and dirt.

and Motor Inshot Burners and

Orifices

Clear of obstructions (even spider webs will cause problems).

Carefully remove any dust and debris from the burner.

Direct-Spark Igniter Replace if there are cracked ceramics, excessive carbon residue, or erosion

of the electrode.

The electrode gap should be 1/8" (3.2 mm).

Thermostat There should be no exposed wire or damage to the device or wiring.

See Page 20, Section 10.

Suspension Points Make sure the heater is hanging securely.

Look for signs of wear on the suspension materials or ceiling.

See Page 9, Figure 4.

Silicone Tubing Ensure tight, secure fit on all pressure fittings at pressure switch and vent box.

Gas Valve Verify that cap covering pressure regulator adjustment screw is secure and

has not been tampered with.

Verify all wiring connections.

Condensate Drain

Flush drain and clear any obstructions.

(when installed)

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Page 48

UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Wall Tag If a wall tag is present, make sure it is legible and accurate. Please contact

Rapid Engineering LLC or your RAPID

independent distributor if you need a

wall tag. See Page 4, Section 2.1.

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Page 49

SECTION 14: TROUBLESHOOTING

DANGER

Electrical Shock Hazard

Disconnect electric before service.

Heater must be connected to a properly grounded electrical source.

Failure to follow these instructions can result in death, electric shock, injury or property damage.

Explosion Hazard

Turn off gas supply to heater before service.

WARNING

Burn Hazard

Allow heater to cool before service.

Tubing may still be hot after operation.

Cut/Pinch Hazard

Wear protective gear during installation, operation and service.

Edges are sharp.

41 of 59

Page 50

UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

14.1 General

42 of 59

Page 51

14.2 Troubleshooting For Automatic Ignition Burner Systems

SECTION 14: TROUBLESHOOTING

For your safety and optimum heater performance, use only replacement parts sold and supplied by Rapid Engineering LLC.

Conduct start-up procedure as shown on Page 29, Section 11.

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Page 52

UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

14.3 Troubleshooting for Flame Supervision System

To measure flame current, connect a 0 - 50 µA DC meter in series with the flame probe. If the meter

reads negative values, then reverse the test leads.

START

Connect a DC ammeter in

series with the flame probe.

Is the flame present and

at least 1 µA DC flame

current?

Ye s

Is there a current flowing in the flame probe circuit with

no flame present?

Does “lockout” occur when

there is a flame present?

Heater Operating

TROUBLESHOOT ENDS.

Use General

Troubleshooting section to

Ye s

trace the fault.

Is the connecting lead damaged? Is the flame probe damaged or touching earthed

components?

Is inlet burner gas pressure

correct? Is live and neutral

polarity correct? Is

flame probe circuit correct?

Repair or replace as

required.

If problems persist, contact

Rapid Engineering LLC at

www.rapidengineering.com

Repair or replace as

Ye s

required.

Replace ignition control.

NOTE: Minimum flame probe current 1 µA DC. Typical flame probe current 3-5 µA DC.

44 of 59

Page 53

14.4 Troubleshooting for Gas Valves

SECTION 14: TROUBLESHOOTING

START

Is gas pressure at inlet of the

valve correct for gas type?

Note pressure found.

Does gas pressure at outlet

of the valve rise when

valve turns on?

Does gas pressure at

outlet of valve return to zero or

lower when valve turns off?

Valve Operating

TROUBLESHOOT ENDS.

14.5 Troubleshooting for Flue Blower

Ye s

Fault elsewhere.

Correct pressure problem.

Valve or ignition control

faulty. Replace with one of correct type.

Valve faulty.

Replace with one of

correct type.

If problems persist, contact

Rapid Engineering LLC at

www.rapidengineering.com

START

Does flue blower run

automatically when there

is a call for heat?

Ye s

Does blower turn on and

off while burner is firing

continously?

Blower Operating

TROUBLESHOOT ENDS.

Ye s

Correct power

supply problem.

Ye s

Blower motor faulty.

Replace with correct type.

Check blower motor leads

for loose connections.

If problems persist, contact

Rapid Engineering LLC at

www.rapidengineering.com

For your safety and optimum heater performance, use only genuine replacement parts sold and supplied by Rapid Engineering LLC.

Conduct start-up procedure as shown on Page 29, Section 11.

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Page 54

UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 15: REPLACEMENT PARTS

DANGER

Electrical Shock Hazard

Explosion Hazard

WARNING

Fire Hazard

Carbon Monoxide Hazard

Use only genuine RAPID® replacement parts per this installation, operation and service manual.

Failure to follow these instructions can result in death, electric shock, injury or property damage.

See warnings and important information on Page 37, Section 13 before removing or replacing parts.

Burner Components

All serviceable burner parts are accessed by the

hinged door on the side of the heater.

Replace in reverse order. Verify that the gas flow direction of the valve is correct. Use a minimum amount of gas seal on the thread joint. Check that all the joints are leak free. Reset gas valve. See Page 33, Section 11.2.2.

15.1 Gas Valve

Remove the gas supply pipe at the heater inlet. Follow instructions on Page 47, Section 15.2 through Page 49, Section 15.3 to remove gas valve/

IT IS IMPORTANT THAT ONLY THE CORRECT GAS VALVE IS USED WHEN REPLACING THESE CONTROLS.

manifold.

Description Part Number

Single Stage Gas Valve, NG (Models UHA[X][S] 150 - 250) 90032505 Single Stage Gas Valve, LP (Models UHA[X][S] 150 - 250) 90032506 Single Stage Gas Valve, NG (Models UHA[X][S] 300 - 400) 90032520 Single Stage Gas Valve, LP (Models UHA[X][S] 300 - 400) 90032521 Two Stage Gas Valve, NG (Models UHA[T][X][S] 150 - 250) 90032530 Two Stage Gas Valve, LP (Models UHA[T][X][S] 150 - 250) 90032531 Two Stage Gas Valve, NG (Models UHA[T][X][S] 300 - 400) 90032532 Two Stage Gas Valve, LP (Models UHA[T][X][S] 300 - 400) 90032533 Exa Valve ½" (Models UHA[M][X][S] 150-250) NG and LP 90032550 Exa Valve ¾" (Models UHA[M][X][S] 300-400) NG and LP 90032551

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Page 55

15.2 Burner Compartment for Models UHA[T][M][X][S] 150-400

Side View of Burner Compartment with Hinged Door Removed

Before burner removal, remove the 10 screws holding the filler panel on and remove the filler panel.

NOTE: Models UHA 300-400 have two axial fans.

SECTION 15: REPLACEMENT PARTS

15.2.1 Burner Compartment without Filler Panel for Models UHA[T][M][X][S] 150-400

Side View of Burner Compartment with Filler Panel Removed

Burner assembly must be removed to service orifices, manifold or burners.

Following any work, refit components in reverse order.

NOTE: Models UHA 300-400 have two axial fans.

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Page 56

UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

15.2.2 Burner Injectors for Models UHA[T][M][X][S] 150-400

Remove 4 screws to remove manifold.

Ensure gas tight fitting of injectors. Ensure correct alignment with burners. Ensure all pipe joints are gas tight.

UHA

MODEL

Orifice Quantity 7 8 9 10 11 12 14 14

Natural Gas

Orifice Marking 43 43 2.25 mm 2.25 mm 2.25 mm 43 43 40

P/N 91930043 91930043 91930225 91930225 91930225 91930043 91930043 91930040

Propane

Orifice Marking 1.35 mm 1.35 mm 54 54 54 1.45 mm 53 53

P/N 91930135 91930135 91930054 91930054 91930054 91930145 91930053 91930053

[T][M][X][S]

150

UHA

[T][M][X][S]

175

UHA

[T][M][X][S]

200

UHA

[T][M][X][S]

225

UHA

[T][M][X][S]

250

UHA

[T][M][X][S]

300

UHA

[T][M][X][S]

350

UHA

[T][M][X][S]

400

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Page 57

SECTION 15: REPLACEMENT PARTS

15.3 Ignition Electrode and Flame Probe for Models UHA[T][M][X][S] 150-400

To replace the ignition electrode or flame probe, remove the

electrical lead and screw. Pull out from mounting. Refit in reverse ensuring that the gap to burner is as shown in the front view of the burner compartment.

Description Part Number Qty.

Spark Electrode 90427411 1 Automatic Ignition Flame Probe 90439300 1 Transformer 90436900K 1

Ignition Module 90434008 1

Inshot Burners UHA[T][M][X][S] 150 92000001 7

Inshot Burners UHA[T][M][X][S] 175 92000001 8

Inshot Burners UHA[T][M][X][S] 200 92000000 9

Inshot Burners UHA[T][M][X][S] 225 92000000 10

Inshot Burners UHA[T][M][X][S] 250 92000000 11

Inshot Burners UHA[T][M][X][S] 300 92000000 12

Inshot Burners UHA[T][M][X][S] 350 92000000 14

Inshot Burners UHA[T][M][X][S] 400 92000000 14

Limit Switch (150 - 400) [300 - 400 LOWER] 90412103 1

Limit Switch (300 - 400) [UPPER] 90412105 1

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UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

15.4 Heat Exchanger

The heat exchanger consists of a four-pass design with 1.75" outer diameter [aluminized steel] [409

stainless steel] tube. The tube plates are made of [aluminized steel] [409 stainless steel]. The tube supports are made of [aluminized steel] [409 stainless steel].

15.5 Louvers and Louver Spring

Description

Horizontal Louvers P/N 11011847 11011847 11011846 Spring P/N 91901200 91901200 91901200 Quantity 7 9 11

UHA[T][M][X][S]

150 - 175

UHA[T][M][X][S]

200 - 250

UHA[T][M][X][S]

300 - 400

The louvers for standard range models UHA[T][M][X][S]150 - UHA[T][M][X][S]400 are only available in

horizontal configurations.

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Page 59

15.6 Flue Blower for Models UHA[T][M][X][S] 150-300

SECTION 15: REPLACEMENT PARTS

Remove screws securing outlet flange to the flue adapter.

Refit in reverse order.

Disconnect electrical connections at plug in tabs.

Remove screws securing flue fan mounting plate to vent box.

Remove screws securing mounting plate to fan. (Not shown)

Refit in reverse.

Use new gaskets.

Ensure sealed joints.

Ensure mounting plate orifice is clear and not obstructed.

UHA[T][M][X][S]

MODEL

Flue Blower P/N 90710403

150 - 300

IT IS IMPORTANT THAT ONLY THE CORRECT FLUE BLOWER SPECIFIED FOR EACH MODEL TYPE IS USED WHEN REPLACING THESE ITEMS.

Carry out a start-up after working on or changing an flue blower. See Page 29, Section 11.

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UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Vent Box

Outlet Gasket

Flue Blower

Vent Box

screws

Flue

Adapter

Flue Adapter

to Flue Blower

screw

Rear Panel

Hole

Disconnect

electrical connections

at plug in tabs.

Mounting Plate

to Vent Box

screws

Gasket

Mounting Plate

to Flue Blower

screws

Vent Box

Air Plate

15.7 Flue Blower for Models UHA[T][M][X][S] 350-400

Remove screws securing outlet flange to the flue adapter.

Refit in reverse order.

Remove screws securing flue blower mounting plate to vent box.

Remove screws securing mounting plate to blower.

Refit in reverse.

Use new gaskets.

Ensure sealed joints.

Ensure mounting plate orifice is clear and not obstructed.

MODEL

Flue Blower P/N 90710402

IT IS IMPORTANT THAT ONLY THE CORRECT FLUE BLOWER SPECIFIED FOR EACH MODEL TYPE IS USED WHEN REPLACING THESE ITEMS.

Carry out a start-up after working on or changing an flue blower. See Page 29, Section 11.

UHA[T][M][X][S]

350 - 400

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Page 61

SECTION 15: REPLACEMENT PARTS

15.8 Pressure Switch

WARNING

Carbon Monoxide Hazard

Use correct pressure switch specified for each model.

Use of incorrect pressure switch or disabling pressure switch circuit could cause unsafe condition.

Failure to follow these instructions can result in death or serious injury.

Pull off 3 way connector. Spring open plastic clips of mounting cradle. Replace with correct type of pressure switch for model. The pressure switches are color coded for each pressure setting. Carry out a start-up after working on or changing a pressure switch. See Page 29, Section 11.

MODEL

Pressure Switch Kit P/N

Color Code

Set Point in. w.c.

Pressure Switch Snap Ring P/N

UHA

[T][M][X][S]

150 - 175

90439803 90439808 90439812 90439811 90439805 90439811

grey orange orange grey blue grey

0.41 0.79 0.18 0.72 0.55 0.72

90439850 90439850 90439850 90439850 90439850 90439850

UHA

[T][M][X][S]

200 - 225

UHA

[T][M][X][S]

250

UHA

[T][M][X][S]

300

UHA

[T][M][X][S]

350

UHA

[T][M][X][S]

400

15.9 Ignition Control

The control mounts to the electrical plate. Pull out ignition cable and wiring from board, noting their

positions. Release the four mounting standoffs. Refit in reverse. Ensure correct location of ignition cable and all other wiring.

15.10 Axial Fan/Guard/Motor Assembly

The axial fan unit for the heater is supplied completely assembled and balanced

MODEL UHA[T][M][X][S] 150 - 175 UHA[T][M][X][S] 200- 250 UHA[T][M][X][S] 300 - 400

Axial Fan Guard 91901104 91901104 91901105

Axial Fan Motor 90600107 90600107 90600106

Axial Fan Blade 90709006 90709006 90709005

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UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

15.10.1 Fan Removal and Replacement

WARNING

Severe Injury Hazard

Turn off gas and electrical supply before service.

Fan can start automatically at any time.

Failure to follow these instructions can result in severe injury or product damage.

15.11 Limit Switches

15.11.1 Removal and Replacement

1. Remove the electrical connections to the switch.

2. Unscrew the two screws securing the switch.

3. Fit a new switch with two screws.

4. Reconnect the electrical connections and test operation.

Description Part Number Qty.

Axial Fan UHA[T][M][X][S] 150 - 175 90710417 1 Axial Fan UHA[T][M][X][S] 200 - 250 90710417 1 Axial Fan UHA[T][M][X][S] 300 - 400 90710416 2

15.10.2 To Replace the Fan Assembly

To replace the fan assembly, reverse the procedure

shown above.

• Check that the fan blades are free to rotate before turning on the power to the fan.

• Strictly comply with the color code of the fan wires to ensure correct operation. See Page 22, Section 10.3, Page 24, Section 10.5 or Page 26, Section 10.7 wiring diagram.

• Use only genuine replacement parts sold and supplied by Rapid Engineering LLC.

54 of 59

Page 63

SECTION 16: SPECIFICATIONS

16.1 Dimension Data for Models UHA[T][M][X][S] 150-250

SECTION 16: SPECIFICATIONS

Model UHA[T][M][X][S]150 UHA[T][M][X][S]175 UHA[T][M][X][S]200 UHA[T][M][X][S]225 UHA[T][M][X][S]250

A in (cm) 42.4 (107.7) 42.4 (107.7) 42.4 (107.7) 42.4 (107.7) 42.4 (107.7)

B in (cm) 26.7 (67.8) 26.7 (67.8) 35.0 (88.9) 35.0 (88.9) 35.0 (88.9)

C in (cm) 25.5 (64.8) 25.5 (64.8) 25.5 (64.8) 25.5 (64.8) 25.5 (64.8)

D in (cm) 17.6 (44.7) 17.6 (44.7) 17.6 (44.7) 17.6 (44.7) 17.6 (44.7)

E in (cm) 19.4 (49.3) 19.4 (49.3) 19.4 (49.3) 19.4 (49.3) 19.4 (49.3)

F in (cm) 30.0 (76.2) 30.0 (76.2) 32.0 (81.3) 32.0 (81.3) 32.0 (81.3)

G in (cm) 6.0 (15.2) 6.0 (15.2) 6.6 (16.8) 6.6 (16.8) 6.6 (16.8)

H in (cm) 8.7 (22.1) 8.7 (22.1) 8.6 (22) 8.6 (22) 8.6 (22)

J in (cm) 17.2 (43.7) 17.2 (43.7) 17.7 (45) 17.7 (45) 17.7 (45)

K in (cm) 3.1 (7.9) 3.1 (7.9) 8.1 (20.6) 8.1 (20.6) 8.1 (20.6)

L in (cm) 5.9 (15) 5.9 (15) 5.7 (14.5) 5.7 (14.5) 5.7 (14.5)

M in (cm) 10.7 (27.2) 10.7 (27.2) 10.5 (26.7) 10.5 (26.7) 10.5 (26.7)

N in (cm) 6.5 (16.5) 6.5 (16.5) 6.5 (16.5) 6.5 (16.5) 6.5 (16.5)

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UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

16.2 General Technical Data Table

Model

UHA[T][M][X][S]

150

Full Load Amps @ 120 V A 10.6 10.6 10.6 10.6 10.6

Air Volume CFM 3500 3500 3716 3716 3716

Flue and Air Intake

Flue Intake Size in (cm) 4 (10) 4 (10) 4 (10) 4 (10) 4 (10)

Air Intake Size in (cm) 4 (10) 4 (10) 4 (10) 4 (10) 4 (10)

*Maximum Straight Flue/Air Intake ft (m) 40 (1) 40 (1) 40 (1) 40 (1) 40 (1)

UHA[T][M][X][S]

175

UHA[T][M][X][S]

200

UHA[T][M][X][S]

225

UHA[T][M][X][S]

250

Weight (Net)

lbs

(kg)

217

(98.4)

237

(107.5)

255

(115.7)

265

(120.2)

270

(122.5)

*Do not exceed the maximum length of flue stated or heater may not operate properly.

16.3 Technical Data Table

Model

UHA[T][M][X][S]

150

Total Input High Fire (Btu/h) x (1000) 150 175 200 225 250

Total Input Low Fire (Btu/h) x (1000) 105 122.5 140 157.5 175

Total Output High Fire (Btu/h) x (1000) 123 143.5 164 184.5 205

Total Output Low Fire (Btu/h) x (1000) 86 100 115 129 143.5

Efficiency (Max Input) % 82 82 82 82 82

Natural Gas Data - Inlet Pressure 5.0 in wc Min., 14 in wc Max.

Burner Pressure High Fire in wc 3.0 3.0 3.2 3.4 3.45

Burner Pressure Low Fire in wc 1.3 1.3 1.6 1.7 1.7

LPG / Propane Data - Inlet Pressure 12.0 in wc Min., 14 in wc Max.

Burner Pressure High Fire in wc 11.1 11.2 9.5 11.1 11.6

Burner Pressure Low Fire in wc 5.0 5.5 4.7 5.4 5.5

UHA[T][M][X][S]

175

UHA[T][M][X][S]

200

UHA[T][M][X][S]

225

UHA[T][M][X][S]

250

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16.4 Dimension Data for Models UHA[T][M][X][S] 300-400

SECTION 16: SPECIFICATIONS

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UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Model UHA[T][M][X][S]300 UHA[T][M][X][S]350 UHA[T][M][X][S]400

A in (cm) 52.3 (132.8) 52.3 (132.8) 52.3 (132.8)

B in (cm) 43.2 (109.7) 43.2 (109.7) 43.2 (109.7)

C in (cm) 25.5 (64.8) 25.5 (64.8) 25.5 (64.8)

D in (cm) 24.7 (62.7) 24.7 (62.7) 24.7 (62.7)

E in (cm) 19.4 (49.3) 19.4 (49.3) 19.4 (49.3)

F in (cm) 30.0 (76.2) 30.0 (76.2) 30.0 (76.2)

G in (cm) 7.0 (17.8) 7.0 (17.8) 7.0 (17.8)

H in (cm) 11.2 (28.4) 11.2 (28.4) 11.2 (28.4)

J in (cm) 13.8 (35.1) 13.8 (35.1) 13.8 (35.1)

K in (cm) 4.3 (6.8) 4.3 (6.8) 4.3 (6.8)

L in (cm) 8.7 (22.1) 8.7 (22.1) 8.7 (22.1)

M in (cm) 12.1 (30.7) 12.1 (30.7) 12.1 (30.7)

N in (cm) 6.5 (16.5) 6.5 (16.5) 6.5 (16.5)

16.5 General Technical Data Table

Model UHA[T][M][X][S]300 UHA[T][M][X][S]350 UHA[T][M][X][S]400

Full Load Amps @ 120 V A 11.6 11.6 11.6

Air Volume CFM 4663 4663 4663

Flue and Air Intake

Flue Intake Size in (cm) 4 (10) 4 (10) 4 (10)

Air Intake Size in (cm) 5 (13) 5 (13) 5 (13)

*Maximum Straight Flue/Air Intake ft (m) 40 (1) 40 (1) 40 (1)

lbs

Weight (Net)

(kg) 355 (161.0) 375 (170.1) 375 (170.1)

*Do not exceed the maximum length of flue stated or heater may not operate properly.

16.6 Technical Data Table

Model UHA[T][M][X][S]300 UHA[T][M][X][S]350 UHA[T][M][X][S]400

Total Input High Fire (Btu/h) x (1000) 300 350 385

Total Input Low Fire (Btu/h) x (1000) 210 245 269.5

Total Output High Fire (Btu/h) x (1000) 246 287 315.7

Total Output Low Fire (Btu/h) x (1000) 172.2 200.9 221

Efficiency % 82 82 82

Natural Gas Data - Inlet Pressure 5.0 in wc Min., 14 in wc Max.

Burner Pressure High Fire in wc 3.9 4.0 3.3

Burner Pressure Low Fire in wc 1.8 1.8 1.4

LPG / Propane Data - Inlet Pressure 12.0 in wc Min., 14 in wc Max.

Burner Pressure High Fire in wc 10.0 8.7 10.7

Burner Pressure Low Fire in wc 4.9 4.2 5.1

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SECTION 17: THE RAPID

UHA-SERIES WARRANTY

RAPID ENGINEERING LLC WILL PAY FOR:

Within 24 months from date of purchase by buyer or 27

months from date of shipment by Rapid Engineering LLC (whichever comes first), replacement parts will be provided free of charge for any part of the product which fails due to a manufacturing or material defect.

Rapid Engineering LLC will require the part in question to be returned to the factory. Rapid Engineering LLC will, at its sole discretion, repair or replace after determining the nature of the defect and disposition of part in question.

RAPID® Replacement Parts are warranted for a period of 18 months from date of shipment from Rapid Engineering LLC or the remaining RAPID® UHA-Series warranty.

RAPID ENGINEERING LLC WILL NOT PAY FOR:

Service trips, service calls and labor charges. Shipment of replacement parts. Claims where the total price of the goods have not

been paid. Damage due to:

• Improper installation, operation or maintenance.

• Misuse, abuse, neglect, or modification of the RAPID® UHA-Series in any way.

• Use of the RAPID® UHA-Series for other than its intended purpose.

• Incorrect gas or electrical supply, accident, fire, floods, acts of God, war, terrorism, or other casualty.

• Improper service, use of replacement parts or accessories not specified by Rapid Engineering LLC.

• Failure to install or maintain the RAPID® UHA-Series as directed in the Installation, Operation and Service manual.

• Relocation of the RAPID® UHA-Series after initial installation

• The use of the RAPID® UHA-Series in a corrosive atmosphere containing contaminants.

• The use of the RAPID® UHA-Series in the vicinity of a combustible or explosive material.

• Any defect in the RAPID® UHA-Series arising from a drawing, design, or specification supplied by or on behalf of the consumer.

• Damage incurred during shipment. Claim must be filed with carrier.

WARRANTY IS VOID IF:

The RAPID® UHA-Series is not installed by an electrician

qualified in the installation and service of control systems for heating equipment.

You cannot prove original purchase date and required

annual maintenance history.

The data plate and/or serial number are removed,

defaced, modified or altered in any way.

SECTION 17: THE RAPID® UHA-SERIES WARRANTY

READ YOUR INSTALLATION, OPERATION AND SERVICE MANUAL

If you have questions about your controller, contact your installing professional. Should you need Replacement Parts or have additional questions, call or write:

Rapid Engineering LLC

1100 Seven Mile Road NW Comstock Park, MI 49321 Telephone: +1.616.784.0500 Fax: +1.616.784.1910 Toll Free: 800.536.3461

www.rapidengineering.com

Rapid Engineering LLC's liability, and your exclusive remedy, under this warranty or any implied warranty (including the implied warranties of merchantability and fitness for a particular purpose) is limited to providing replacement parts during the term of this warranty. Some jurisdictions do not allow limitations on

how long an implied warranty lasts, so this limitation may not apply to you. There are no rights, warranties or conditions, expressed or implied, statutory or otherwise, other than those contained in this warranty.

Rapid Engineering LLC shall in no event be responsible for incidental or consequential damages or incur liability for damages in excess of the amount paid by you for the RAPID® UHA-Series. Some

jurisdictions do not allow the exclusion or limitation of incidental or consequential damages, so this limitation or exclusion may not apply to you. This warranty gives you specific legal rights, and you may also have other rights which vary from jurisdiction to jurisdiction.

Rapid Engineering LLC shall not be responsible for failure to perform under the terms of this warranty if caused by circumstances out of its control, including but not limited to war, fire, flood, strike, government or court orders, acts of God, terrorism, unavailability of supplies, parts or power. No person is authorized to assume for Rapid Engineering LLC any other warranty, obligation or liability.

LIMITATIONS ON AUTHORITY OF REPRESENTATIVES:

No representative of Rapid Engineering LLC, other than an Executive Officer, has authority to change or extend these provisions. Changes or extensions shall be binding only if confirmed in writing by Rapid Engineering LLC's duly authorized Executive Officer.

The ownership of the RAPID® UHA-Series is moved or

transferred. This warranty is nontransferable. Rapid Engineering LLC is not permitted to inspect the

damaged controller and/or component parts.

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Rapid Engineering UHAT 175, UHAT 400, UHAT 300, UHAT 350, UHAT 200 Installation, Operation & Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual