Trane Gas Unit Heaters Catalogue UH PRC002 EN 09/01/2009 Product Catalog Indoor Heating Products Heaters, Duct Furnaces

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September 2009 UH-PRC002-EN

Indoor Gas Heating Products

Unit Heaters

Duct Furnaces

Product Catalog

© 2009 Trane All rights reserved UH-PRC002-EN

Introduction

Trane unit heaters, offered in both propeller and centrifugal models, are a complete heat generating

and distributing plant, equipped with automatic controls, and packaged in an attractive

streamlined housing. Designed for ceiling mounting, they provide a convenient low-cost method

of comfortably heating stores, factories, warehouses, and other large open areas.

Trane unit heaters represent a technological breakthrough in quality. Trane offers customers the

most complete line of unit heaters anywhere. And every unit in the line has been rated for 80

percent thermal efficiency or better.

But higher thermal efficiency and lower operating costs are just two features of this product line.

Innovation—the engineering advances you’ve come to expect from Trane—can also be found

across this entire line of unit heaters. And rugged, quality construction provides years of

dependable service.

Quality products mean Trane value. So does fair, competitive pricing. The 10-year warranty tells

you Trane will be here for the long haul—keeping our commitment to you. You can count on Trane

standing behind every unit shipped. That is what Trane value means.

Trademarks

Trane and the Trane logo are trademarks of Trane in the United States and other countries.

Table of Contents

UH-PRC002-EN 3

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Features Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Features and Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Application Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Venting Unit Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Selection Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Indoor Gas Heating Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Model Number Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Horizontal Blower Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

General Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Service Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Heat Throw Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Gas Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Sequence of Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Single-Stage Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Two-Stage Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Electronic Modulating Control (with duct thermostat) . . . . . . . . . . . . . . . 35

Electronic Modulating Control (with room thermostat) . . . . . . . . . . . . . . 37

High-Efficiency Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Separated Combustion Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Dimensions and Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Mechanical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Tubular Heat Exchanger Indoor Gas Unit (model GT) . . . . . . . . . . . . . . . 58

High Efficiency Propeller (model GH) and Centrifugal Fan Gas Unit Heaters

(model GB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Separated Combustion Centrifugal (model GK) and Propeller Fan Gas Unit

Heaters (model GA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

High Efficiency Indoor Gas Duct Furnaces (model GL) . . . . . . . . . . . . . . 63

Separated Combustion Duct Furnaces (model GM) . . . . . . . . . . . . . . . . . 65

Horizontal Blower Assembly (model HBAC) . . . . . . . . . . . . . . . . . . . . . . . 67

4 UH-PRC002-EN

Features Highlights

Ten-Year Warranty

The complete heat exchanger, draft hood assembly of the unit heater and burners are warranted

by Trane to be free from defects in material and workmanship for a period of 10 years from the date

of manufacture. (Warranty not applicable on duct furnaces or Separated Combustion units.)

Quiet Operation

Trane unit heaters incorporate an exceptionally balanced fan blade to assure quiet operation.

Heat Exchangers

All Trane heat exchangers are available in three types of steel:

• Aluminized Steel (Standard)

• 409 Grade Stainless Steel (Optional) (30–400 MBh units)

• 321 Grade Stainless Steel (Optional) (100–400 MBh units)

24V System

All units are equipped with a 24Vcontrol system which is powered by a 24V transformer as standard

equipment.

Fan Time Delay

The fan time delay switch is mounted at the factory as standard equipment on all unit heaters

(optional on duct furnaces). This feature eliminates an initial blast of cold air by allowing the unit

to fire for a short period of time before actuating the fan motor. After the thermostat is satisfied

(with burners off), the fan continues to operate for approximately one minute, removing residual

heat from heat exchanger.

Burners

All sizes 30,000 through 400,000 Btu input are equipped with a proven design pressed steel burner

having a unique “burner shade” protective device to prevent scale or foreign matter from plugging

the burner ports.

Energy Saving Ignition Pilot Control

The pilot burner is ignited only during each cycle of operation, thereby conserving energy during

the off cycle.

LP/Natural Operation

All units are available for operation on either natural or LP gas from our factory.

Easy Access For Maintenance

All Trane unit heaters are so designed that the burner access panel is removed with just two screws.

Burners are individually removable for inspection and servicing. Pilot is also accessible through

side panel access door.

Te s t F i r e

All Trane unit heaters are test fired to assure proper operation.

Ideal For Retrofit

Trane unit heaters let you pocket fuel savings from day one and provide years of dependable

service.

UH-PRC002-EN 5

Features and Benefits

Propeller Fan / Tubular Heat Exchanger Unit Heaters

Trane has added a new unit heater to enhance its broad line of heating products. The Trane

tubular heat exchanger is a very durable unit heater that provides an alternative to the traditional

clam shell style. These are propeller style units that combine the latest tubular heat exchanger

style with inshot burner technology to create a very efficient operating unit.

High Efficiency Propeller Fan Unit Heaters

Trane high-efficiency propeller fan unit heaters achieve annual fuel savings of 20 to 25 percent

over conventional gravity vented heaters. Each unit features a factory-installed power venter fan

and sealed flue collector that controls combustion and excess air during the on-cycle.

Heated air no longer escapes through the draft diverter opening during the off-cycle. Energy

saving spark ignition reduces gas losses. The pilot only operates when required.

Horizontal power venting allows side wall venting, smaller openings, and single-walled vent

pipe, reducing heat loss. Higher efficiencies can reduce equipment and material costs as well as

installation time.

High Efficiency Centrifugal Fan Unit Heaters

The high-efficiency centrifugal fan unit heater keeps energy costs down. The design advances

achieve annual fuel savings of 20 to 25 percent over conventional gravity vented heaters.

The high-efficiency centrifugal unit features integral power venting (factory-installed) and

sealed flue collector for optimum combustion. Electronic spark ignition reduces pilot gas losses,

and the power venter allows for horizontal venting through side walls. It adds up to higher

seasonal efficiencies and lower installation time.

High Efficiency Indoor Duct Furnace

The high efficiency indoor gas duct furnace complements our current centrifugal and propeller

fan lines. All high efficiency lines were designed to achieve fuel savings of up to 25 percent over

conventional gravity vented heaters.

Conventional gravity vented heaters lost heated room air through the draft diverter opening. The

high efficiency line features an integral flue vent fan and sealed flue collector for improved

combustion. It reduces air requirements and wind effects on the system’s efficiency. Intermittent

pilot ignition reduces pilot gas losses and the flue vent fan allows for horizontal venting through

side walls.

Note: DUCT FURNACES ARE APPROVED FOR BLOW-THROUGH APPLICATIONS ONLY.

Horizontal Blower Assemblies

Trane horizontal blower assemblies have been specially designed for air handling systems of

high static pressure in combination with Trane duct furnaces. They are matched against the

proper furnace size for greatest efficiency of operation.

6 UH-PRC002-EN

Features and Benefits

Separated Combustion Propeller Fan Unit Heaters

The Trane separated combustion propeller type unit heater keeps energy costs down by offering

80 percent thermal efficiencies. With model inputs available from 100 through 400 MBH, they

are designed to be installed in mildly hostile environments where dusty, dirty and mildly

corrosives exist or high humidity or slightly negative pressures prevail.

The Trane propeller unit separates the combustion process from the environment where the unit

is installed. A power venting system draws a controlled quantity of combustion air from outside

the building. The same system exhausts flue gas products to the outside. The burners, pilot and

flue system are enclosed within the unit. The entire combustion process is literally unaffected

by the atmosphere in the space where the unit is located.

Combustion and exhaust air may be piped horizontally through a side wall, or vertically through

the roof via our standard two-pipe venting arrangement or optional concentric vent kit which

utilizes one 8-inch side wall or rooftop penetration for both the combustion and exhaust air. Both

venting systems are C.S.A. International certified.

Separated Combustion Centrifugal Fan Unit Heaters

The Trane separated combustion centrifugal type unit heater keeps energy costs down by

offering 80 percent thermal efficiencies. With model inputs available from 100 through 400 MBh,

they are designed to be installed in mildly hostile environments where dusty, dirty and mildly

corrosives exist or high humidity or slightly negative pressures prevail. This unit operates at a

static pressure up to 0.2” water column, and is available with a louvered (standard) or flanged

outlet (optional) when discharge duct work is desired.

These units separate the combustion process from the environment where the unit is installed.

A power venting system draws a controlled quantity of combustion air from outside the

building. The same system exhausts flue gas products to the outside. The burners, pilot and flue

system are enclosed within the unit. The entire combustion process is literally unaffected by the

atmosphere in the space where the unit is located.

Separated Combustion Duct Furnace

The Trane separated combustion duct furnace is designed for installation in dusty, dirty or mildly

corrosive environments or where high humidity or slightly negative pressures exist. Ideal

applications include HVAC equipment rooms, manufacturing facilities, automotive garages and

greenhouses.

UH-PRC002-EN 7

Application Considerations

General

Propeller fan unit heaters and centrifugal fan unit heaters are designed for use in space heating

applications. The units are typically used in areas with high ceilings, and are exposed in the space

to be heated. Unit heaters offer low installed cost, and are able to heat large volume areas without

requiring extensive duct systems.

Duct furnaces are designed for use in ducted applications with a separate air handling device such

as a horizontal blower assembly. By utilizing a separate air source, greater application flexibility in

airflow delivery can be obtained. Multiple duct furnaces can be used with an air handling unit to

provide zone heating.

Note: When installing duct furnaces in parallel or in series, minimum clearance requirements

must be considered. This is required for serviceability of the gas valve and the high limit.

“All duct furnaces are approved in blow-thru applications only.”

All duct furnaces are AGA approved upstream or downstream of the cooling coil. Recommend

optional field installed drain pan when installed on the downstream side of the cooling coil.

Note: Downstream denotes cooling coil ahead of the fan section.

When used in conjunction with filters, cooling coils and an air handler, the duct furnace can become

part of a built-up heating and cooling system.

Gas Heating Value

The majority of gas heating units are installed in applications where natural gas is readily available.

In areas where natural gas is not available, Trane units may be ordered directly from the factory

for use on LP (propane) gas.

Gas heat content varies by fuel type and location. The standard gross heating value for natural gas

is 1,000 Btu per cubic foot, and for propane, 2,500 Btu per cubic foot. Significant variations from

these standard values should be taken into consideration in equipment selections. To account for

variations in the gross heating value of the fuel, adjust the total heat input required and select the

unit on the basis of the adjusted load using the following formula:

Low Temperature Rise

Trane recommends against the setup of a unit which will result in a temperature rise of less than

30°F. With such low temperature rises, the flue gases passing through the heat exchanger are

cooled to condensate before reaching the flue outlet. This condensate is corrosive and will result

in shortened heat exchanger life.

Air Density

Catalog performance data is based on elevations up to 2,000 feet above sea level. Above 2,000 feet

the unit’s heating capacity must be derated four percent for each 1,000 feet above sea level, and

Adjusted load = Calculated load x gross heat value (Btu/ft3)

Actual gross heat value (Btu/ft3)

8 UH-PRC002-EN

Application Considerations

special orifice selections are required. Ta b l e 8, p. 2 4 contains correction factors that can be applied

to the unit’s cataloged heating capacity, fan rpm, and fan bhp to obtain actual values for elevations

above 2,000 feet.

Corrosive Atmospheres

Corrosion of heat exchangers and draft diverters have two basic variables—moisture

(condensation) and sulphur. These two ingredients form to make sulfuric acid in the combustion

process. Condensation occurs commonly in makeup air systems, using large amounts of fresh air,

when air temperatures entering the heat exchanger drop to 40°F or below. This reaction can also

occur in recirculating systems where some quantity of outside air is introduced upstream of the

exchanger. The sulphur will always be present as an integral component of the gas. The resulting

concentration of the acid is governed by the amount of sulphur in the gas. This concentration varies

from gas to gas and geographically within the same type of gas.

Beyond sulfuric acid corrosion there is the area of chlorinated or halogenated hydrocarbon vapor

corrosion. This type of corrosion occurs when substances are mixed with combustion air that will

cause the formation of hydrochloric or hydrofluoric acid when burned. These basic substances are

found in degreasers, dry cleaning solvents, glues, cements, paint removers and aerosol

propellants. Specific chemicals included in this group are trichloroethylene, perchloroethylene,

carbon tetrachloride, methylene chloride, methyl chloroform and refrigerants 11, 12, 21, 22 and 114.

If sufficient PPM content of these corrosives is present, none of the common heat exchanger

materials will hold up. The dilemma becomes whether to place the gas heating equipment outside

of the area to be conditioned, or use equipment in the space which does not burn a fuel such as

gas (i.e., electric or hydronic).

Units should not be installed in areas with corrosive or inflammable atmospheres. Locations

containing solvents or chlorinated hydrocarbons will produce corrosive acids when coming in

contact with burner flames. This reaction will greatly reduce the life of the heat exchanger and may

void the warranty. For added protection against heat exchanger corrosion, optional 409 and 321

stainless steel construction is available. On units using outside air, with entering air temperature

below 40°F, condensation of flue gas in the heat exchanger is possible. In these cases, stainless steel

heat exchangers are recommended.

Careful review of the job application with respect to use, probable contaminants within a

conditioned space or the amount of fresh air to be brought in, will help to make the proper selection

of heat exchanger material. This review will help to eliminate problems before they begin.

Indoor Units

Indoor gas unit heaters and duct furnaces are used primarily in commercial and industrial

structures such as manufacturing areas, warehouses, garages, stores, showrooms, lobbies, and

corridors.

Separated combustion units are used primarily in industrial work areas with wood or textile dust,

non-explosive contaminated environments, nonchlorine process areas, automotive and truck

garages and greenhouses.

Unit Placement

Refer to the applicable Trane Installation, Operation and Maintenance literature for specific

installation instructions. Installations must conform with local building codes or in the absence of

local codes with the National Fuel Gas Code ANSI Z223.1.

When selecting a location for an indoor unit heater, both the size and weight of the unit, as well as

the heating requirements of the building, should be considered. Installation of units in airplane

hangars or public garages should be in accordance with NFPA No. 409 for aircraft hangars, and

NFPA No. 88 for garages.

For proper distribution, air should be directed towards areas of maximum heat loss. When multiple

units are used, circulation of heated air around the space perimeter is recommended. Satisfactory

results can also be obtained where multiple units are located toward the center of the area, with

UH-PRC002-EN 9

Application Considerations

heated air being discharged toward the outside walls. Throw data for standard unit heaters and unit

heaters utilizing optional discharge nozzles is shown in “General Data,” p. 20.

Locations where extreme drafts can affect burner operation should be avoided. Strong drafts may

cause pilot outage. Units with intermittent pilot ignition may be preferable in areas where drafts

are likely.

Minimum clearances required for accessibility and safety are listed in Tab l e 2 , p. 20 .

Mounting Detail

(Hanging Hardware Supplied by Others)

Throw Data

Throw data for units with standard louvers and for units with optional discharge nozzles are in

“General Data,” p. 20. Optional nozzles are for use on propeller fan unit heaters, centrifugal fan unit

heaters and duct furnaces. When greater throw distance is desired, a 45° nozzle is recommended.

For high mounting heights, a 90° nozzle may be used. When wide diffusion is needed, a Y splitter

nozzle should be considered. A five-way nozzle can be used for applications requiring even air

Figure 1. Steel Construction

Figure 2. Wood Construction

10 UH-PRC002-EN

Application Considerations

distribution over a large floor area. (Five-way nozzles are not available on propeller fan unit

heaters.)

Indoor Units—Venting

Gas fired indoor units require venting to remove the products of combustion. To help assure safe,

trouble-free operation, follow the guidelines listed below:

Power Vented Units

Units with a factory installed flue vent fan.

1. All units must be vented. Power vented units are designed to use single wallvent pipe. A

Breidert Type L, Field Starkap, or equivalent unit vent cap must be furnished by the customer.

2. The venting system for these appliances shall terminate at least 4 feet below, 4 feet horizontally

from, or 1 foot above any door, window or gravity air inlet into any building.

3. Through-the-wall vents for these appliances shall not terminate over public walkways or over

an area where condensate or vapor could create a nuisance or hazard or could be detrimental

to the operation of regulators, relief valves, or other equipment.

4. The vent pipe diameter must be as shown under “Recommended Flue Size” in the specification

charts. An adaptor must be field supplied if required.

5. Each furnace must have an individual vent pipe and vent terminal. Vent pipe equivalent

length must not exceed 50 feet. Equivalent length is the total length of straight sections, plus

15 feet for each 90° elbow and 8 feet for each 45° elbow.

6. Maintain 6 inch clearance between vent pipe and combustible materials. Vent terminal must be

installed with a minimum clearance of 4 feet from electric meters, gas meters, regulators, and

relief equipment.

7. Seal vent pipe joints to prevent leakage. Use General Electric RTV-108 or Dow Corning RTV-732

Silicone Sealant or 3M #425 aluminum foil tape.

8. Pitch horizontal pipes downward 1/4-inch per foot toward outlet for condensate drainage.

Horizontal portions of the venting system shall be supported at maximum intervals of 4 feet to

prevent sagging.

9. Vertical vent pipes should be equipped with condensate drains.

10. Insulate single wall vent pipe exposed to cold air or running through unheated areas.

FM and IRI Requirements

IRI, which stands for Industrial Risk Insurers, and FM, which stands for Factory Mutual, are both

basically insurance companies which insure commercial/industrial firms against a variety of

losses. Both publish requirements which must be met by certain equipment operating in the

facilities they are preparing to insure.

Listed below is our interpretation of the requirements of both insurers pertaining to heating units

only to the extent of features/controls required by IRI and/or FM. There are a number of additional

requirements which pertain to electrical service, details of installation, etc., and we urge you to

obtain copies of the publications pertaining to these details if you are involved in a job where IRI

or FM adherence has been indicated. The requirements detailed herein are our interpretations of

the latest publications in our possession and we must disclaim any responsibility for errors due to

our interpretation and/or lack of any updated revision of these standards. Our intent is to provide

you with an understanding of the application of these standards and how we believe our indirect-

fired gas heating equipment applies.

IRI Requirements

1. All input sizes require 100 percent shutoff. This requires that any natural gas unit, equipped with

intermittent pilot ignition, must employ a “lock out” type ignition system which will shut off

pilot gas if the pilot fails to light at any time. This system is required by AGA on LP gas units

UH-PRC002-EN 11

Application Considerations

as standard equipment. However, for natural gas units, you need to specify on the order

“Natural Gas, 100 percent shutoff.”

2. All units require AGA certification or UL “listed” controls. Our units are AGA certified and meet

this requirement.

3. Models with inputs of 150,000 to 400,000 Btu require “mechanical exhaust” and a “safety

interlock.” For our units, this means a power vented or drafter-equipped unit. In both instances,

if the flue vent fan (factory or field installed) does not get up to speed, the unit will not fire,

satisfying the safety interlock portion.

FM Requirements

1. All units must be AGA certified or UL listed. Our units are AGA certified.

2. The high limit control must be in a circuit, the voltage of which does not exceed 120 Vac. All of

our high limits would meet this requirement.

The specific requirement for an “IRI or FM Gas Train,” while it applies to direct and indirect-fired

gas heating equipment as well as oil-fired, comes into play only with units having an input in excess

of 400,000 Btu. This may be one of the reasons why the majority of gas heating equipment

manufacturers (indirect-fired) limit their largest individual furnace to 400,000 Btu.

Minimum/Maximum Gas Inlet Pressures

Gas valves are suitable to a maximum inlet pressure of 0.5 psi (14 inches water column) on natural

gas. If the main gas supply pressure is greater than 14 inches wc, a step-down pressure regulator

must be field-installed ahead of the gas valve. Minimum inlet pressure for natural gas units is

5 inches wc.

For LP (propane) gas, the minimum inlet pressure is 11.0 inches wc and the maximum inlet pressure

is 14.0 inches wc.

High Pressure Regulators—Natural Gas Only

The Trane indoor gas heating products contained in this catalog are designed to operate at a

pressure of 3.5-inch wc (water column) when firing on natural gas. This is the “manifold” pressure

or that which is present at the burner orifices. All five- and six-function valves provide a built-in

pressure regulator which is capable of reducing “supply” pressures from a maximum of 14-inch

wc (1/2 psi) down to 3.5-inch wc on the leaving side of the valve. The valve typically “drops” about

1-1/2 inches so the minimum supply pressure is 5-inch wc.

Whenever supply pressures exceed 14 inches wc, a high pressure regulator should be selected. We

supply a Rockwell regulator which is fitted with pressure springs and capacity orificing to meet the

requirements of each specific job. In order to select the proper spring/orifice combination, we need

to know what the supply pressure is on that particular job and the input size of the unit being

ordered. More than one unit can be run from one regulator; however, we recommend that each unit

have its own regulator.

We require that the “job” supply pressure be included on all jobs requiring high pressure

regulators along with the unit size. Ta b l e 1 displays the regulators range as it pertains to inlet

pressure and MBh. A dash (—) requires the customer to contact a local utility or an industrial supply

house.

These devices are not available from Trane for LP gas. LP accessories must be secured from the

gas supplier/ supply house.

12 UH-PRC002-EN

Application Considerations

Venting Unit Heaters

Venting unit heaters and duct furnaces used to be as simple as remembering that warm air rises.

With the introduction of new venting equipment and safety controls, things have become a little

more technical. Today’s contractor has to know a lot more about proper venting to get the job done

within code at a reasonable price.

For starters, ANSI now categorizes vented appliances into four categories. Category I includes non-

condensing appliances with negative vent pressure, like the traditional atmospheric unit heater.

Category II groups condensing appliances with negative vent pressure.

Category III appliances are non-condensing and operate with a positive vent pressure, like the

traditional power vented unit heater. Category IV covers condensing appliances with positive vent

pressure.

Sharing Flues with Other Appliances

Never connect power vented devices to common flues. Mechanically vented appliances must have

dedicated vents to the point of termination.

Power Vented Unit Heaters

Mechanically vented appliances have enjoyed increasing acceptance in American facilities. Power

vented unit heaters allow installation without the need to penetrate expensive roofing materials.

They also offer more flexibility in placement of individual unit heaters.

Table 1. Orifice chart: Rockwell 043–182 regulator

Inlet Pressure

(psi)

Capacity in Mbh for Natural Gas

Spring Required

25–200 225–300 350–500 600 700 800

1 3/8” — — — — — Blue (only)

2 3/8” 3/8” — — — — Blue (only)

3 3/8” 3/8” 3/8” — — — Blue or Green

5 3/8” 3/8” 3/8” 3/8” 3/8” 3/8” Blue or Green

10 3/8” 3/8” 3/8” 3/8” 3/8” 3/8” Blue or Green

20 1/4” 1/4” 1/4” 1/4” 1/4” 5/16” Blue or Green

40 1/4” 1/4” 1/4” 1/4” 1/4” 1/4” Blue or Green

60 1/8” 1/8” 1/8” 1/8” 1/8” 3/16” Blue or Green

80 1/8” 1/8” 1/8” 1/8” 1/8” — Blue or Green

100 1/8” 1/8” 1/8” 1/8” 1/8” 1/8” Blue or Green

125 1/8” 1/8” 1/8” 1/8” 1/8” 1/8” Blue or Green

Venting Categories

Non-Condensing Condensing

Negative Vent Pressure I II

Positive Vent Pressure III IV

UH-PRC002-EN 13

Application Considerations

Mechanical venting occurs when a power blower provides a positive air flow to exhaust vent gas.

The blower may be mounted at the unit heater or at the point of termination. With a factory-

installed power venter, a pressure switch detects the flow of vent gas before the gas valve is

allowed to open. With third party drafters, a centrifugal switch usually monitors the operation of

the blower motor. When properly installed, the switch senses motor rotation and allows the gas

valve to operate. Interlocking the blower to the gas valve provides some control over the

combustion process. Using a factory unit with a pressure sensitive switch ensures that control.

With all their advantages, power venters bring some requirements as well. Each manufacturer

determines the maximum length of pipe and fittings that his system can use for safe operation.

Remember to count the fittings and allow for their higher resistance to flow. The total length of run

includes not only the piping length, but the resistance of all the fittings including the termination

cap.

Many contractors have become accustomed to using B vent with natural draft units. Used with

power vented appliances indoors, B vent is unacceptable. B vent does not allow positive pressure

in the vent piping to be sealed from the heated space. Proper installation uses 24-gauge, single wall

vent pipe and each joint sealed with temperature resistant sealant or tape.

Contractors must also be aware of the conditions at the point of termination. The National Fuel Gas

Code NFPA 54/ANSI Z223.1-1992 mandates that vent system should terminate at least 4 feet below,

4 feet horizontally or 1 foot above any window, door, or gravity inlet to a building. Termination with

a vent cap approved by the manufacturer should occur well above the snow line.

Figure 3. Power vented unit heater

Figure 4. Vent termination locations (minimum distance)

14 UH-PRC002-EN

Application Considerations

Beyond satisfying the codes, vents should be positioned away from shrubs and plants that might

be affected by unseasonable warming by the exhaust. Sidewall vents release a considerable

amount of water vapor that may condense on cold siding, adversely affecting painted surfaces.

Placing these vents in locations that get natural air circulation from prevailing winds may help to

reduce these negative effects.

Separated Combustion Venting

Another form of mechanical venting includes those unit heaters that use a powered exhaust also

to pull in outside air. Most often found on condensing furnaces, separated combustion does not

use room air for combustion. Instead these unit heaters use a second run of pipe to supply fresh

outdoor air.

The separated combustion approach offers several advantages. First, it does not use warm indoor

air to fire the unit heater. This saves energy by avoiding drawing unheated make-up air into the

living space. Second, the unit heater has an unlimited source of air for combustion. In many of the

new super insulated buildings appliances can be starved for combustion air. In contaminated

atmospheres the use of separated combustion unit heaters assures that the heat exchanger sees

only non-corrosive air.

When positioning the intake and exhaust vents on separated combustion equipment, the intake

and outlet must mount on the same outside surface. This ensures that any wind effects balance out.

Remember to keep the vents at least 18” apart to avoid drawing exhaust air into the intake air.

With Trane’s separated combustion unit heaters intake air and exhaust air run through standard

24-gauge galvanized pipe. Remember that separated combustion unit heaters still have high vent

1. Heat

2. Fumes

3. Humidity

1

2

3

UH-PRC002-EN 15

Application Considerations

temperatures. Use of PVC, CPVC and other plastic vent materials are inappropriate and hazardous.

Check the manufacturer’s instructions before piping any appliance.

The vent gases of power vented and separated combustion unit heaters may condense on a cold

start-up or when vent piping runs through unheated areas. To protect the heater always pitch both

intake and exhaust piping toward the outside of the building. Remember also that no power vented

equipment can share a common flue with any other appliance. Should a flue become blocked one

appliance could vent into the occupied space.

Approved vent caps should be used on both the intake and exhaust terminations. For greater

convenience Trane offers a concentric vent adapter that allows venting through a single perforation

through the building wall or roof.

16 UH-PRC002-EN

Selection Procedure

Determine the total heating load requirements in accordance with methods recommended by the

ASHRAE Handbook of Fundamentals or other acceptable means.

High Efficiency Propeller Fan Unit Heater

1. From the performance data tables, select the unit whose heating output meets or exceeds the

heating load requirement.

2. Airflow (cfm) and temperature rise can be read directly from the performance data tables.

3. Knowing the mounting height of the unit, throw can be determined from the performance data

table. If the throw is not adequate, consider using a larger propeller fan unit heater or a

centrifugal fan unit heater with an optional discharge nozzle for greater throw.

Selection Example—A natural gas propeller fan unit heater that can provide 75 MBh heating

output is required. The unit will be mounted 10 feet above the floor and a 40-foot throw is

required.

Select the unit as follows:

a. From Table 10, p. 25, select a GHND-010 with 100.0 MBh input and 80.0 MBh heating output,

1,480 cfm and a 50°F temperature rise.

b. From Ta b l e 3, p . 2 0 , throw at a mounting height of 10 feet is 54 feet.

High Efficiency Centrifugal Fan Unit Heater

1. From the performance data tables, select the unit whose heating output meets or exceeds the

heating load requirement.

2. Airflow (cfm) ranges are listed for each unit size in the performance data tables. Knowing either

the desired airflow or temperature rise, the other can be calculated using the following

formulas:

3. Knowing the mounting height of the unit, throw can be determined from the performance data

table. If the throw is not adequate, a discharge nozzle can be used to obtain additional throw.

Selection Example—An LP (Propane) gas centrifugal fan unit heater that can provide 150 MBh

heating output is required. An airflow of 2,000 cfm is desired. The unit will be mounted 12 feet

above the floor and a 65-foot throw is required.

Select the unit as follows:

a. From Table 11, p. 25, select a GBPD-020 with a 200.0 MBh input and 160.0 MBh heating

output. An airflow of 2,000 cfm is within the allowable range, and temperature rise is

calculated as follows:

b. From Table 3, p. 20, throw at a 12-foot mounting height is 61 feet. As a 61-foot throw is not

adequate, a 60-degree nozzle can be selected (from Table 5, p. 21) which provides a throw

of 76 feet.

cfm = Output x 1,000

1.085 x ΔT

ΔT = Output x 1,000

1.085 x cfm

ΔT = MBh x 1,000

1.085 x χφμ

ΔT = 160 x 1,000 = 74.0°F

1.085 x 2,000

UH-PRC002-EN 17

Selection Procedure

High Efficiency Duct Furnace

1. From the performance data tables, select the unit whose heating output meets or exceeds the

heating load requirement.

2. Given the airflow to be supplied to the duct furnace, temperature rise and pressure drop

through the duct furnace can be read directly from the performance data charts. If the air

temperature rise is below 30°F, some supply air must be bypassed around the duct furnace. If

the air temperature rise is over 80°F, additional supply air must be delivered to the duct furnace.

Selection Example—A natural gas duct furnace that can provide 300 MBh heating output is

required. An airflow of 5,000 cfm is being provided to the duct furnace.

Select the unit as follows:

a. From Table 14, p. 27, select a GLND-040 with a 400.0 MBh input and 320.0 MBh heating

output.

b. From Figure 10, p. 29, temperature rise at 5,000 cfm is 58°F and pressure drop is 0.16 inches.

Horizontal Blower Assembly

1. From the performance data tables, select the blower assembly that provides the needed airflow

at the required static pressure, and determine the required motor size and fan speed.

2. If a blower assembly is to be used with a duct furnace, refer to the dimensional data table to

determine which blower to use with the given duct furnace. The duct furnace pressure drop

must be added to the pressure drop of the duct system before entering the blower assembly

performance data tables. Enter the performance data table at the required airflow and at the

total external static pressure to determine the motor size and fan speed.

Selection Example—A GLND-040 high efficiency duct furnace is to be used with a horizontal

blower assembly. An airflow of 5,000 cfm is required. The pressure drop of the duct system is

0.54 inches, and the pressure drop of the duct furnace is 0.16 inches.

Select the unit as follows:

a. From Table 29, p. 55, select a HBAC-45 for use with the GLND-040 duct furnace.

b. From Table 16, p. 28, an HBAC-45 at 5,000 cfm and 0.7 inches static pressure (0.54-inch

ductwork + 0.16-inch furnace) requires a 1-1/2 hp motor with a fan speed of 720 rpm.

18 UH-PRC002-EN

Indoor Gas Heating Units

Note: All units are AGA approved. For

CGA approved units, contact Air

Handling Product Support.

Digit 1 — Gas Heating

Equipment

Digit 2 — Product Type

B = High Efficiency Centrifugal Fan

Unit Heater

L = High Efficiency Indoor Duct

Furnace

H = High Efficiency Propeller Fan Unit

Heater

A = Separated Combustion Propeller

Fan Unit Heater

K = Separated Combustion

Centrifugal Fan Unit Heater

M = Separated Combustion Indoor

Duct Furnace

T = Propeller Fan / Tubular Heat

Exchanger

Digit 3 — Fuel

N= Natural Gas

P=LP Gas (Propane)

Digit 4 — Development

Sequence

D = Fourth Generation

Digits 5, 6, 7 — Input Capacity

Single Furnace

Digit 8 — Main Power Supply

003(a)

(a) Not available for high efficiency propeller fan.

= 30 MBh 015 = 150 MBh

004(a) = 45 MBh 017 = 175 MBh

006(a) = 60 MBh 020 = 200 MBh

007(a) = 75 MBh 022 = 225 MBh

009 = 90 MBh 025 = 250 MBh

010(b)

(b)Not available for tubular.

= 100 MBh 030 = 300 MBh

011(c)

(c) Available for tubular only.

= 105 MBh 035 = 350 MBh

120(c) = 120 MBh 040 = 400 MBh

012(b) = 125 MBh

A = 115/60/1 D = 230/60/3

B = 230/60/1 E = 460/60/3

C = 208/60/3 F = 575/60/3

Digit 9 — Gas Control Option

D = Single-Stage, Intermittent Pilot

Ignition

E = Two-Stage, Intermittent Pilot

Ignition

H = Electronic Modulating with Room

T-Stat, Intermittent Pilot Ignition

J = Electronic Modulating with

Duct-Stat, Intermittent Pilot

Ignition

L = Electronic Modulating with

External 4–20 mA Input

N = Electronic Modulating with

External 0–10 Vdc Input

T = Single Stage Direct Spark Ignition

V = Two-Stage, Direct Spark Ignition

Digit 10 — Design Sequence

G = Seventh Design

Digit 11 — Heat Exchanger

Material

1 = Aluminized Steel

2 = #409 Stainless Steel

3 = #321 Stainless Steel

Digit 12 — Rooftop

Arrangements

0 = None (Indoor Unit)

Digit 13 — Rooftop Heating Unit

Motor Selection

0 = None (Indoor Unit and Rooftop

Duct Furnace)

Digit 14 — Rooftop Fan Section

0 = None (Indoor Unit and Rooftop

Duct Furnace)

Digit 15 — Miscellaneous

Options

All Units

0=None

A = #409 Stainless Steel Burners1

B = Orifices For Elevation Above 2000

Feet (Specify Elevation)

Propeller Fan Unit Heater

(High Efficiency and Separated

Combustion)

C = #409 Stainless Steel Draft Diverter

D = Summer-Winter Switch

E = Vertical Louvers

J = Totally Enclosed Motor

7 = OSHA Fan Guard

Centrifugal Fan Unit Heater

(High Efficiency and Separated

Combustion)

C = #409 Stainless Steel Draft Diverter

D = Summer-Winter Switch

E = Vertical Louvers

H = Duct Discharge Flange

J = Totally Enclosed Motor

Duct Furnace (Indoor) (High

Efficiency)

C = #409 Stainless Steel Draft Diverter

D = Summer-Winter Switch

F = Horizontal Louvers

G = Horizontal and Vertical Louvers

K = Side Access Burner Drawer (Left

Hand)2

L = Fan Time Delay Control

M = Side Access Burner Drawer (Right

Hand)2

Separated Combustion, Indoor Duct

Furnace

C = #409 Stainless Steel Draft Diverter

D = Summer-Winter Switch

F = Horizontal Louvers

G = Horizontal and Vertical Louvers

Propeller Type / Tubular Heat

Exchanger

J = Totally Enclosed Motor

7 = OSHA Fan Guard

1Not available for tubular.

2The left or right hand side of the side access burner

drawer, options K & M, is determined by facing the

air outlet side of the duct furnace.

Model Number Descriptions

UH-PRC002-EN 19

Model Number Descriptions

Horizontal Blower

Assembly

Digit 1, 2, 3 — Horizontal Blower

Assembly

Digit 4 — Development

Sequence

C = Third Generation

Digit 5, 6 — Blower Size

15 = Nominal 1500 cfm

20 = Nominal 2000 cfm

30 = Nominal 3000 cfm

45 = Nominal 4500 cfm

Digit 7 — Transition Size

(Specifies Duct Furnace Size)

Digit 8 — Main Power Supply

Digit 9 — Motor Horsepower

Digit 10 — Design Sequence

D = Fourth Design

Digit 11 — Miscellaneous

Options

0=None

1 = Insulation

3 = Totally Enclosed Motor

0=None

A = 100 MBh F = 225 MBh

B = 125 MBh G = 250 MBh

C = 150 MBh H = 300 MBh

D = 175 MBh J = 350 MBh

E = 200 MBh K = 400 MBh

A = 115/60/1 D = 230/60/3

B = 230/60/1 E = 460/60/3

C = 208/60/3

A = 1/3 hp D = 1 hp

B = 1/2 hp E = 1-1/2 hp

C = 3/4 hp F = 2 hp

20 UH-PRC002-EN

General Data

Service Clearances

Heat Throw Data

Table 2. Minimum clearances

Duct Furnace Propeller & Centrifugal Fan U.H.

Sides 18” 18”

Top 6” 6”

Bottom 21”(a) 21”

Flue 6” 6”

(a)21” clearance is required for bottom access to burners and pilot. If a side pull-out burner drawer is ordered (duct furnace only), bottom clearance can

be reduced to six inches. Side clearance, however, must be increased such that it is adequate for burner drawer removal. Reference Table 27, p. 53.

Figure 5. Standard unit heater applications

Table 3. Standard unit heater—approximate distance of throw at nominal airflow

Distance From

Floor to Bottom

of Unit “H”

ft (m)

Unit Size

Input MBh (kW)

30 45 60 75 100 125 150 175 200 225 250 300 350 400

(8.8) (13.2) (17.6) (22.0) (29.3) (36.6) (43.9) (51.2) (58.6) (65.9) (73.2) (87.8) (102.5) (117.1)

8 3333334060657075808590105110120

(2.4) (10.1) (10.1) (10.1) (12.2) (18.3) (19.8) (21.3) (22.9) (24.4) (25.9) (27.4) (32.0) (33.5) (36.6)

10 28 28 28 35 54 56 60 64 68 72 78 90 95 100

(3.0) (8.5) (8.5) (8.5) (10.7) (16.5) (17.1) (18.3) (19.5) (20.7) (21.9) (23.8) (27.4) (29.0) (30.5)

12 — — — — 44 46 49 57 61 65 68 80 84 90

(3.7) (13.4) (14.0) (14.9) (17.4) (18.6) (19.8) (20.7) (24.4) (25.6) (27.4)

15 ——————4549525660707480

(4.6) (13.7) (14.9) (15.8) (17.1) (18.3) (21.3) (22.6) (24.4)

20 ————————465054636670

(6.1) (14.0) (15.2) (16.5) (19.2) (20.1) (21.3)

UH-PRC002-EN 21

General Data

Figure 6. 30° nozzle

Table 4. 30-degree nozzle—approximate distance of throw at nominal airflow

Distance From Floor

to Bottom of Unit “H”

ft (m)

Unit Size

Input MBh (kW)

100 125 150 175 200 225 250 300 350 400

(29.3) (36.6) (43.9) (51.2) (58.6) (65.9) (73.2) (87.8) (102.5) (117.1)

8 65707580859095115120125

(2.4) (19.8) (21.3) (22.9) (24.4) (25.9) (27.4) (29.0) (35.1) (36.6) (38.1)

10 57 60 64 68 72 78 86 99 105 110

(3.0) (17.4) (18.3) (19.5) (20.7) (21.9) (23.8) (26.2) (30.2) (32.0) (33.5)

12 50 54 57 60 64 70 77 88 94 100

(3.7) (15.2) (16.5) (17.4) (18.3) (19.5) (21.3) (23.5) (26.8) (28.7) (30.5)

15 — 45 48 50 53 59 64 74 79 84

(4.6) (13.7) (14.6) (15.2) (16.2) (18.0) (19.5) (22.6) (24.1) (25.6)

20 — — — 44 47 53 58 66 71 75

(6.1) (13.4) (14.3) (16.2) (17.7) (20.1) (21.6) (22.9)

Notes:

1. All throw data figures are approximate.

2. — = not recommended at these mounting heights.

3. Nozzles are not available on units below size 100 MBh.

4. Nozzles are available for high-efficiency units. Specify High Efficiency when ordering due to difference in nozzle configuration.

Figure 7. 60° nozzle

Table 5. 60-degree nozzle—approximate distance of throw at nominal airflow

Distance From Floor

to Bottom of Unit “H”

ft (m)

Unit Size

Input MBh (kW)

100 125 150 175 200 225 250 300 350 400

(29.3) (36.6) (43.9) (51.2) (58.6) (65.9) (73.2) (87.8) (102.5) (117.1)

8 7580859095100110125130138

(2.4) (22.9) (24.4) (25.9) (27.4) (29.0) (30.5) (33.5) (38.1) (39.6) (42.1)

10 65 70 75 79 83 88 95 109 115 120

(3.0) (19.8) (21.3) (22.9) (24.1) (25.3) (26.8) (29.0) (33.2) (35.1) (36.6)

12 60 64 68 72 76 80 84 100 103 108

(3.7) (18.3) (19.8) (20.7) (21.9) (23.2) (24.4) (25.6) (30.5) (31.4) (32.9)

15 50 54 56 61 65 68 71 85 88 94

(4.6) (15.2) (16.5) (17.1) (18.6) (19.8) (20.7) (21.6) (25.9) (26.8) (28.7)

20 — 49 52 55 59 61 65 77 81 85

(6.1) (14.9) (15.8) (16.8) (18.0) (18.6) (19.8) (23.5) (24.7) (25.9)

22 UH-PRC002-EN

General Data

Figure 8. 90° nozzle

Table 6. 90-degree nozzle—approximate floor coverage at nominal airflow

Unit Size

Distance From Floor to Bottom of Unit “H”

ft (m)

10 15 20 25 30

(3.0) (4.6) (6.1) (7.6) (9.1)

100 — 30 x 25 — — —

(9.1 x 7.6)

125 — 35 x 30 — — —

(10.7 x 9.1)

150 — 40 x 35 — — —

(12.2 x 10.7)

175 — 45 x 40 — — —

13.7 x 12.2)

200 — 50 x 40 40 x 35 — —

(15.2 x 12.2) (12.2 x 10.7)

225 — 55 x 40 48 x 35 — —

(16.8 x 12.2) (14.6 x 10.7)

250 — 60 x 45 56 x 40 50 x 35 —

(18.3 x 13.7) (17.1 x 12.2) (15.2 x 10.7)

300 — 70 x 45 65 x 40 60 x 35 55 x 35

(21.3 x 13.7) (19.8 x 12.2) (18.3 x 10.7) (16.8 x 10.7)

350 — 80 x 50 70 x 45 65 x 40 60 x 35

(24.4 x 15.2) (21.3 x 13.7) (19.8 x 12.2) (18.3 x 10.7)

400 — 100 x 50 80 x 45 75 x 40 65 x 40

(30.5 x 15.2) (24.4 x 13.7) (22.9 x 12.2) (19.8 x 12.2)

UH-PRC002-EN 23

General Data

Figure 9. “Y” splitter

Table 7. “Y” splitters—approximate distance of throw at nominal airflow

Distance From

Floor to Bottom

of Unit “H”

ft (m)

Unit Size

Input MBh (kW)

100 125 150 175 200 225 250 300 350 400

(29.3) (36.6) (43.9) (51.2) (58.6) (65.9) (73.2) (87.8) (102.5) (117.1)

8 4751606570728095100103

(2.4) (14.3) (15.5) (18.3) (19.8) (21.3) (21.9) (24.4) (29.0) (30.5) (31.4)

10 41 44 52 56 61 63 69 82 87 92

(3.0) (12.5) (13.4) (15.8) (17.1) (18.6) (19.2) (21.0) (25.0) (26.5) (28.0)

12 37 40 47 51 55 57 63 75 79 82

(3.7) (11.3) (12.2) (14.3) (15.5) (16.8) (17.4) (19.2) (22.9) (24.1) (25.0)

Notes:

1. All throw data figures are approximate.

2. Nozzles are not available on units below size 100 MBh.

3. Nozzles are available for high-efficiency units. Specify High Efficiency when ordering due to difference in nozzle configuration.

24 UH-PRC002-EN

Performance Data

Table 8. Correction factors for high altitude installations

Altitude Above Sea Level (ft) 0 2,000 3,000 4,000 5,000 6,000 7,000

Gas Heating Capacity 1.00 0.92 0.88 0.84 0.8 0.76 0.72

Fan rpm 1.00 1.04 1.06 1.09 1.12 1.15 1.19

Fan bhp 1.00 1.07 1.12 1.18 1.25 1.33 1.41

Notes:

1. For high altitude installations above 2,000 feet, reduce ratings 4 percent for each 1,000 feet above sea level.

2. Multiply standard unit by correction factor to get actual input and required rpm and hp.

Table 9. Tubular Heat Exchanger performance data—model GTND/GTPD

Unit Size 003 004 006 007 009 011 120 015 017 020 025 030 035 040

Input MBh 30 45 60 75 90 105 120 150 175 200 250 300 350 400

kW 8.8 13.2 17.6 22.0 26.4 30.8 35.2 43.9 51.2 58.6 73.2 87.8 102.5 117.1

Output MBh 24.9 37.35 49.8 61.5 73.8 86.1 98.4 124.5 145.25 166.0 207.5 249.0 290.5 332.0

kW 7.2 10.9 14.5 18.0 21.6 25.2 28.8 36.4 42.5 48.6 60.7 72.9 85.1 97.2

Thermal Efficiency 83 83 83 82 82 82 82 83 83 83 83 83 83 83

Free Air Delivery

cfm 370 550 740 920 1,100 1,300 1,475 2,400 2,850 3,200 3,450 5,000 5,600 5,800

m3/s 0.175 0.260 0.349 0.434 0.519 0.614 0.696 1.133 1.346 1.511 1.629 2.361 2.644 2.738

Air Temperature Rise

°F 60 60 60 60 60 60 60 47 46 47 54 45 47 51

°C 15 15 15 15 15 15 15 26 26 26 30 25 26 28

Full Load Amps at 120V 3.0 3.0 4.1 4.1 6.4 6.4 6.4 5.8 8.0 8.0 8.0 11.3 13.5 13.5

Motor Data

hp 1/20 1/20 1/12 1/12 1/10 1/10 1/10 1/4 1/3 1/3 1/3 1/4 1/3 1/3

kW 0.04 0.04 0.06 0.06 0.075 0.075 0.075 0.19 0.25 0.25 0.25 0.19 0.25 0.25

Type SP SP SP SP SP SP SP PSC PSC PSC PSC PSC PSC PSC

rpm 1,650 1,650 1,050 1,050 1,050 1,050 1,050 1,140 1,140 1,140 1,140 1,140 1,140 1,140

Amps at 115V 1.9 1.9 2.6 2.6 4.2 4.2 4.2 4.7 5.8 5.8 5.8 9.4 11.6 11.6

Notes:

1. Ratings are shown for elevations up to 2,000 feet above sea level. Above 2,000 feet, input must be derated 4 percent for each 1,000 feet above sea

level.

2. CS = Capacitor Start; SPH = Split Capacitor

3. Standard motors are 115/60/1 open drip-proof.

4. 0.2 maximum external static pressure.

5. Unit amps are based on hot surface pilot ignition.

UH-PRC002-EN 25

Performance Data

Table 10. High Efficiency Propeller Fan Gas Unit Heater performance data—model GHND/GHPD

Unit Size 010 012 015 017 020 022 025 030 035 040

Input MBh 100 125 150 175 200 225 250 300 350 400

kW 29.3 36.6 43.9 51.2 58.6 65.9 73.2 87.8 102.5 117.1

Output MBh 80 100 120 140 160 120 200 240 280 320

kW 23.4 29.3 35.1 41.0 46.9 52.7 58.6 70.3 82.0 93.7

Thermal Efficiency 80% 80% 80% 80% 80% 80% 80% 80% 80% 80%

Free Air Delivery

cfm 1,480 1,650 2,200 2,530 2,640 2,700 3,100 4,400 5,000 5,300

m3/s 0.699 0.779 1.038 1.194 1.246 1.274 1.463 2.077 2.360 2.502

Air Temperature Rise

°F 50 56 50 51 56 61 60 50 52 56

°C 28 31 28 28 31 34 33 28 29 31

Output Velocity

fpm 775 910 1,045 1,070 1,010 950 980 1,100 1,150 1,050

m/s 3.94 4.62 5.31 5.44 5.13 4.83 4.98 5.59 5.84 5.33

Full Load Amps at 115V 5.8 6 7.2 8.2 8.2 8.2 8.2 11.2 13.2 13.2

Motor Data

hp 1/20 1/10 1/4 1/3 1/3 1/3 1/3 (2) 1/4 (2) 1/3 (2) 1/3

kW 0.037 0.075 0.186 0.249 0.249 0.249 0.249 (2) 0.186 (2) 0.249 (2) 0.249

Type SP SP PSC PSC PSC PSC PSC PSC PSC PSC

rpm 1,050 1,050 1,140 1,140 1,140 1,140 1,140 1,140 1,140 1,140

Amps at 115V 2.6 2.8 4.0 4.5 4.5 4.5 4.5 8.0 9.0 9.0

Notes:

1. Ratings are shown for elevations up to 2,000 feet above sea level. Above 2,000 feet, input must be derated 4 percent for each 1,000 feet above sea

level.

2. Standard 115/60/1 open drip-proof motor.

3. The flue vent fan motors used on all high efficiency units are 115/60/1; 1/20 hp and 1.5 amps.

Table 11. High Efficiency Centrifugal Fan Unit Heater performance data—model GBND/GBPD

Unit Size 010 012 015 017 020 022 025 030 035 040

Input MBh 100 125 150 175 200 225 250 300 350 400

kW 29.3 36.6 43.9 51.2 58.6 65.9 73.2 87.8 102.5 117.1

Output MBh 80 100 120 140 160 180 200 240 280 320

kW 23.4 29.3 35.1 41.0 46.9 52.7 58.6 70.3 82.0 93.7

Thermal Efficiency 80% 80% 80% 80% 80% 80% 80% 80% 80% 80%

Free Air Delivery

cfm 1,200 1,575 1,975 2,300 2,400 2,600 2,850 3,950 4,600 4,800

m3/s 0.566 0.743 0.932 1.086 1.133 1.227 1.345 1.864 2.171 2.266

Air Temperature Rise

°F 62 59 56 56 62 64 65 56 56 62

°C 34 33 31 31 34 36 36 31 31 34

Output Velocity

fpm 880 950 1,030 1,045 965 935 930 1,080 1,090 1,000

m/s 4.47 4.83 5.23 5.31 4.90 4.72 4.72 5.49 5.54 5.08

Full Load Amps at 115V 8.3 9.8 10.6 10.6 15.2 15.2 15.2 15.2 18.6 18.6

Motor Data

hp 1/4 1/3 1/2 1/2 3/4 3/4 3/4 3/4 1 1

kW 0.19 0.25 0.37 0.37 0.56 0.56 0.56 0.56 0.75 0.75

Type SHP SHP SHP SHP SHP SHP SHP SHP CS CS

rpm 1,725 1,725 1,725 1,725 1,725 1,725 1,725 1,725 1,725 1,725

Amps at 115V 5.1 6.6 7.4 7.4 12.0 12.0 12.0 12.0 15.4 15.4

Notes:

1. Ratings are shown for elevations up to 2,000 feet above sea level. Above 2,000 feet, input must be derated 4 percent for each 1,000 feet above sea

level.

2. Standard motors are 115V 60 Hz, single-phase open drip-proof.

3. The flue vent fan motors used on all high efficiency units are 115/60/1; 1/20 hp and 1.5 amps. All other voltages will require an additional

transformer.

4. SPH = Split Phase; CS = Capacitor Start

5. 0.2” maximum external static pressure.

26 UH-PRC002-EN

Performance Data

Table 12. Separated Combustion Propeller Fan Gas Unit Heater performance data—model GAND/GAPD

Unit Size 010 012 015 017 020 022 025 030 035 040

Input MBh 100 125 150 175 200 225 250 300 350 400

kW 29.3 36.6 43.9 51.2 58.6 65.9 73.2 87.8 102.5 117.1

Output MBh 80 100 120 140 160 180 200 240 280 320

kW 23.4 29.3 35.1 41.0 46.9 52.7 58.6 70.3 82.0 93.7

Thermal Efficiency 80% 80% 80% 80% 80% 80% 80% 80% 80% 80%

Free Air Delivery

cfm 1480 1650 2200 2530 2640 2700 3100 4400 5000 5300

m3/s 0.699 0.779 1.038 1.194 1.246 1.274 1.463 2.077 2.360 2.502

Air Temperature Rise

°F 50 56 50 51 56 61 60 50 52 56

°C 28 31 28 28 31 34 33 28 29 31

Output Velocity

fpm 775 910 1045 1070 1000 950 980 1100 1150 1050

m/s 3.94.65.35.45.14.85.05.65.85.3

Full Load Amps at 115V 5.8 6.0 7.2 7.8 7.8 7.8 8.8 11.2 12.2 12.2

Motor Data

hp 1/20 1/10 1/4 1/3 1/3 1/3 1/2 (2) 1/4 (2) 1/3 (2) 1/3

kW 0.037 0.075 0.186 0.249 0.249 0.249 0.373 (2) 0.186 (2) 0.249 (2) 0.249

Type SP SP PSC PSC PSC PSC PSC PSC PSC PSC

rpm 1,050 1,050 1,140 1,140 1,140 1,140 1,140 1,140 1,140 1,140

Amps at 115V 2.6 2.8 4.0 4.5 4.5 4.5 5.5 8.0 9.0 9.0

Notes:

1. Ratings are shown for elevations up to 2,000 feet above sea level. Above 2,000 feet, input must be derated 4 percent for each 1,000 feet above sea

level.

2. Standard motor is 115/60/1 open drip-proof.

3. SP = Shaded Pole; PSC = Permanent Split Capacitor.

Table 13. Separated Combustion Centrifugal Fan Gas Unit Heater performance data—model GKND/GKPD

Unit Size 010 012 015 017 020 022 025 030 035 040

Input MBh 100 125 150 175 200 225 250 300 350 400

kW 29.3 36.6 43.9 51.2 58.6 65.9 73.2 87.8 102.5 117.1

Output MBh 80 100 120 140 160 180 200 240 280 320

kW 23.4 29.3 35.1 41.0 46.9 52.7 58.6 70.3 82.0 93.7

Thermal Efficiency 80% 80% 80% 80% 80% 80% 80% 80% 80% 80%

Free Air Delivery

cfm 1,200 1,575 1,975 2,300 2,400 2,600 2,850 3.950 4,600 4,800

m3/s 0.566 0.743 0.932 1.086 1.133 1.227 1.345 1.864 2.171 2.266

Air Temperature Rise

°F 62 59 56 56 62 64 65 56 56 62

°C 34 33 31 31 34 36 36 31 31 34

Output Velocity

fpm 880 950 1030 1045 965 935 930 1080 1090 1000

m/s 4.47 4.83 5.23 5.31 4.90 4.75 4.72 5.49 5.54 5.08

Full Load Amps at 115V 8.3 9.8 10.6 10.6 15.2 15.2 15.2 15.2 18.6 18.6

Motor Data

hp 1/4 1/3 1/2 1/2 3/4 3/4 3/4 3/4 1 1

kW 0.19 0.25 0.37 0.37 0.56 0.56 0.56 0.56 0.75 0.75

Type SPH SPH SPH SPH SPH SPH SPH SPH CS CS

rpm 1725 1725 1725 1725 1725 1725 1725 1725 1725 1725

Amps at 115V 5.1 6.6 7.4 7.4 12.0 12.0 12.0 12.0 15.4 15.4

Notes:

1. Ratings are shown for elevations up to 2,000 feet above sea level. Above 2,000 feet, input must be derated 4 percent for each 1,000 feet above sea

level.

2. Standard motor is 115/60/1 open drip-proof.

3. SPH = Split Phase; CS = Capacitor Start.

UH-PRC002-EN 27

Performance Data

Table 14. High Efficiency Indoor Gas Duct Furnace performance data—model GLND/GLPD

Unit Size

Input

MAX MIN Output MIN Temp. Rise P.D. MAX Temp. Rise P.D.

MBhkWMBhkWMBhkW cfmm

3/s °F °C in. of H2OkPa cfm m

3/s °F °C in. of H2OPascals

010 100 29.3 50 14.6 80 23.4 929 0.438 80 44 0.12 0.03 2469 1.165 30 17 0.85 0.21

012 125 36.6 62.5 18.3 100 29.3 1157 0.546 80 44 0.13 0.03 3086 1.457 30 17 0.85 0.21

015 150 43.9 75 22.0 120 35.1 1389 0.656 80 44 0.15 0.04 3704 1.748 30 17 0.85 0.21

017 175 51.2 87.5 25.6 140 41.0 1620 0.765 80 44 0.14 0.03 4321 2.040 30 17 0.85 0.21

020 200 58.6 100 29.3 160 46.9 1852 0.874 80 44 0.14 0.03 4938 2.331 30 17 0.85 0.21

022 225 65.9 112.5 32.9 180 52.7 2083 0.983 80 44 0.14 0.03 5556 2.622 30 17 0.85 0.21

025 250 73.2 125 36.6 200 58.6 2315 1.093 80 44 0.14 0.03 6173 2.914 30 17 0.85 0.21

030 300 87.8 150 43.9 240 70.3 2778 1.311 80 44 0.13 0.03 7407 3.496 30 17 0.87 0.22

035 350 102.5 175 51.2 280 82.0 3241 1.530 80 44 0.13 0.03 8642 4.079 30 17 0.87 0.22

040 400 117.1 200 58.6 320 93.7 3704 1.748 80 44 0.14 0.03 9877 4.662 30 17 0.90 0.22

Note: Ratings are shown for elevations up to 2,000 feet above sea level. Above 2,000 feet input must be derated four percent for each 1,000 feet above

sea level.

Table 15. Separated Combustion Indoor Gas Duct Furnace performance data—model GMND/GMPD

Unit Size

Input

MAX MIN Output MIN Temp. Rise P.D. MAX Temp. Rise P.D.

MBhkWMBhkWMBhkW cfmm

3/s °F °C in. of H2OkPa cfm m

3/s °F °C in. of H2OPascals

010 100 29.3 50 14.6 80 23.4 822 0.388 90 50 0.10 0.02 3700 1.746 20 11 2.03 0.51

012 125 36.6 62.5 18.3 100 29.3 1028 0.485 90 50 0.09 0.02 4625 2.183 20 11 1.92 0.48

015 150 43.9 75 22.0 120 35.1 1233 0.582 90 50 0.09 0.02 5550 2.620 20 11 1.81 0.45

017 175 51.2 87.5 25.6 140 41.0 1439 0.679 90 50 0.09 0.02 6475 3.056 20 11 1.86 0.46

020 200 58.6 100 29.3 160 46.9 1645 0.776 90 50 0.09 0.02 7401 3.493 20 11 1.90 0.47

022 225 65.9 112.5 32.9 180 52.7 1850 0.873 90 50 0.09 0.02 8326 3.930 20 11 1.93 0.48

025 250 73.2 125 36.6 200 58.6 2056 0.970 90 50 0.09 0.02 9251 4.366 20 11 1.96 0.49

030 300 87.8 150 43.9 240 70.3 2467 1.164 90 50 0.10 0.02 11101 5.240 20 11 2.00 0.50

035 350 102.5 175 51.2 280 82.0 2878 1.358 90 50 0.10 0.02 12951 6.113 20 11 2.02 0.50

040 400 117.1 200 58.6 320 93.7 3289 1.552 90 50 0.10 0.02 14801 6.986 20 11 2.05 0.51

Note: Ratings are shown for elevations up to 2,000 feet above sea level. Above 2,000 feet input must be derated four percent for each 1,000 feet above

sea level.

28 UH-PRC002-EN

Performance Data

Table 16. Horizontal Blower Assembly performance data

Models

Nominal

cfm

Blower

Size

External Static Pressure

in. of H2O 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

kPa 0.05 0.07 0.10 0.12 0.15 0.17 0.20 0.22

cfm hphphphphphphphp

m3/s rpmkWrpmkWrpmkWrpmkWrpmkWrpmkWrpmkWrpmkW

HBAC-15 1,500 10” 1,250 525 1/3 650 1/3 680 1/3 760 1/3 780 1/3 840 1/3 — — — —

0.590 0.25 0.25 0.25 0.25 0.25 0.25

1,500 600 1/3 680 1/3 715 1/3 790 1/3 810 1/2 860 1/2 895 1/2 970 1/2

0.708 0.25 0.25 0.25 0.25 0.37 0.37 0.37 0.37

1,750 650 1/3 710 1/3 750 1/2 805 1/2 850 1/2 890 1/2 940 3/4 990 3/4

0.826 0.25 0.25 0.37 0.37 0.37 0.37 0.56 0.56

2,000 700 1/2 760 1/2 800 1/2 850 1/2 890 1/2 925 3/4 980 3/4 1,010 3/4

0.944 0.37 0.37 0.37 0.37 0.37 0.56 0.56 0.56

HBAC-20 2,000 12” 1,500 425 1/3 500 1/3 550 1/3 630 1/3 — — — — — — — —

0.708 0.25 0.25 0.25 0.25

1,750 450 1/3 515 1/3 560 1/3 635 1/2 680 1/2 725 1/2 — — — —

0.826 0.25 0.25 0.25 0.37 0.37 0.37

2,000 475 1/3 530 1/3 590 1/2 640 1/2 690 1/2 740 1/2 785 1/2 810 3/4

0.944 0.25 0.25 0.37 0.37 0.37 0.37 0.37 0.56

2,250 515 1/2 560 1/2 610 1/2 650 1/2 700 3/4 750 3/4 790 3/4 815 3/4

1.062 0.37 0.37 0.37 0.37 0.56 0.56 0.56 0.56

2,500 540 1/2 590 1/2 625 1/2 670 1/2 710 3/4 760 3/4 795 3/4 820 3/4

1.180 0.37 0.37 0.37 0.37 0.56 0.56 0.56 0.56

2,750 575 1/2 615 1/2 650 3/4 690 3/4 730 3/4 780 3/4 800 3/4 830 1

1.298 0.37 0.37 0.56 0.56 0.56 0.56 0.56 0.75

HBAC-30 3,000 12” 1,750 450 1/3 510 1/3 560 1/3 630 1/3 675 1/2 720 1/2 — — — —

0.826 0.25 0.25 0.25 0.25 0.37 0.37

2,000 475 1/3 525 1/3 590 1/2 635 1/2 680 1/2 735 1/2 785 1/2 810 3/4

0.944 0.25 0.25 0.37 0.37 0.37 0.37 0.37 0.56

2,250 500 1/2 550 1/2 600 1/2 645 1/2 685 1/2 740 3/4 785 3/4 810 3/4

1.062 0.37 0.37 0.37 0.37 0.37 0.56 0.56 0.56

2,500 525 1/2 580 1/2 615 1/2 665 1/2 700 3/4 750 3/4 790 3/4 815 3/4

1.180 0.37 0.37 0.37 0.37 0.56 0.56 0.56 0.56

2,750 560 1/2 605 1/2 640 3/4 685 3/4 715 3/4 775 3/4 805 3/4 825 1

1.298 0.37 0.37 0.56 0.56 0.56 0.56 0.56 0.75

3,000 610 1/2 640 3/4 660 3/4 710 3/4 750 1 790 1 815 1 845 1

1.416 0.37 0.56 0.56 0.56 0.75 0.75 0.75 0.75

3,250 630 3/4 675 3/4 700 1 735 1 750 1 790 1 830 1 860 1

1.534 0.56 0.56 0.75 0.75 0.75 0.75 0.75 0.75

3,500 675 3/4 700 1 725 1 775 1 800 1 840 1-1/2 875 1-1/2 890 1-1/2

1.652 0.56 0.75 0.75 0.75 0.75 1.12 1.12 1.12

HBAC-45 4,500 12” 2,750 400 3/4 450 3/4 510 3/4 — — — — — — — — — —

1.298 0.56 0.56 0.56

3,000 425 3/4 475 3/4 550 3/4 600 3/4 650 3/4 — — — — — —

1.416 0.56 0.56 0.56 0.56 0.56

3,500 430 3/4 480 3/4 560 3/4 610 3/4 660 3/4 700 1 730 1 — —

1.652 0.56 0.56 0.56 0.56 0.56 0.75 0.75

4,000 450 3/4 500 3/4 565 3/4 615 3/4 670 1 710 1 740 1 790 1

1.888 0.56 0.56 0.56 0.56 0.75 0.75 0.75 0.75

4,500 475 3/4 525 3/4 575 3/4 620 1 680 1 715 1 750 1 800 1-1/2

2.124 0.56 0.56 0.56 0.75 0.75 0.75 0.75 1.12

5,000 500 3/4 540 3/4 600 1 630 1 690 1 720 1-1/2 760 1-1/2 810 1-1/2

2.360 0.56 0.56 0.75 0.75 0.75 1.12 1.12 1.12

5,500 530 1 575 1 615 1 650 1-1/2 700 1-1/2 700 1-1/2 730 1-1/2 820 1-1/2

2.596 0.75 0.75 0.75 1.12 1.12 1.12 1.12 1.12

6,000 575 1-1/2 615 1-1/2 660 1-1/2 690 1-1/2 715 1-1/2 760 2 800 2 830 2

2.832 1.12 1.12 1.12 1.12 1.12 1.49 1.49 1.49

6,500 610 1-1/2 660 2 710 2 750 2 800 2 840 2 890 3 930 3

3.068 1.12 1.49 1.49 1.49 1.49 1.49 2.24 2.24

7,000 720 1-1/2 790 2 830 2 860 2 910 3 940 3 960 3 — —

3.304 1.12 1.49 1.49 1.49 2.24 2.24 2.24

7,500 800 2 860 2 900 3 930 3 960 3 — — — — — —

3.540 1.49 1.49 2.24 2.24 2.24

8,000 860 2 930 3 960 3 — — — — — — — — — —

3.776 1.49 2.24 2.24

Note: External Static Pressure in inches of water. Add pressure drop of indoor duct furnace, if used, to pressure drop of ductwork, to determine total external

static pressure. HBAC units are for use with specific duct furnace sizes. Reference Table 29, p. 55.

UH-PRC002-EN 29

Performance Data

Figure 10. Performance data curves for all duct furnaces

30 UH-PRC002-EN

Controls

Pilot Control

High efficiency units (centrifugal, propeller and duct furnaces) ship as standard with intermittent

pilot ignition. The separated combustion propeller and centrifugal fan unit heaters also ship as

standard with intermittent pilot ignition.

Intermittent pilot ignition contains a solid-state ignition control system that ignites the pilot by

spark for each cycle of operation. When the pilot flame is proven, the main burner valve opens to

allow gas flow to the burners. Both the pilot and burners are extinguished during the off cycle.

Intermittent pilot ignition is ideal for limited access installations where manual lighting of the pilot

may be difficult. Nuisance pilot outages on units mounted in areas subject to occasional severe

drafts can also be eliminated. Energy savings will be realized using this system as the pilot is

extinguished during the off cycle. Intermittent pilot ignition should be considered on units that

have long shutoff periods.

Fan Control

The supply fan motor is activated directly through the fan time delay relay on indoor units provided

with single-phase motors up to one hp. Contactors or starters are required on all other units with

single-phase motors, 1-1/2 hp and above, and with all three-phase motors. On indoor units,

contactors and starters, where required, are provided (see Ta b l e 17 .)

Gas Controls

Single-Stage Control

Indoor gas heating units are provided with an automatic single-stage gas valve as standard. This

valve is an on/off type control, typically activated by a low voltage single-stage thermostat.

Two-Stage Control

Indoor units with optional two-stage control are provided with a two-stage gas valve capable of

firing at 100 percent and 50 percent of rated input. Ignition is at low fire (50 percent of the unit’s rated

input) and the unit is typically controlled by a low voltage two-stage thermostat.

Electronic Modulating Control

This optional control is available for use with natural gas units only. Units with electronic

modulating control are provided with an electronic modulating valve capable of firing from 100

percent to 50 percent of rated input. Ignition is at full fire (100 percent of unit’s rated input). The

electronic modulating valve is controlled by a room thermostat or a duct thermostat with remote

setpoint adjustment which modulates the gas input from 100 percent to 50 percent of rated input.

An optional override room thermostat is available for use with the duct thermostat. The override

room thermostat allows full fire and overrides the duct thermostat when the room temperature

falls below the override room thermostat’s setpoint.

Note: N/A on 30–75 MBh units.

Table 17. Contactors provided on indoor units

hp

Voltage 1/2 3/4 1 1-1/2 2 3 5 7-1/2 10

115/60/1 1 1 1 2 2 N/A N/A N/A N/A

230/60/1 1 1 1 2 2 N/A N/A N/A N/A

208/60/3222222244

230/60/3222222244

460/60/3333333355

Notes:

1. Contactors not required or provided on units with single phase motors up to one hp.

2. Provided with contactor with line voltage holding coil on all 1-1/2 hp and above single-phase motors and on all 208/230V

three-phase motors up to five hp.

3. Provided with contactor with low (24V) holding coil on all 460 V three-phase motors up to five hp.

4. Provided with size 2 starter on all units with 7-1/2 and 10 hp 208/230V three-phase motors.

5. Provided with size 1 starter on all units with 7-1/2 and 10 hp 460V three-phase motors.

UH-PRC002-EN 31

Controls

Electronic Modulating, 4–20 mA/0–10 Vdc Input

Provides modulated heat output. Ignition is at full fire (100 percent input), and modulates the gas

input from 100 percent to 40 percent rated input.

The modulating gas valve shall operate in response to a 4–20 mA or a 0–10 Vdc input from an

external DDC control.

32 UH-PRC002-EN

Controls

Thermostats

Electronic Modulating Room

Thermostat

(Included with Gas Control)

• Low Voltage (24 V)

• 60 to 85°F Range

• 5-13/16” W 3-1/4” H 1-7/8” D

• Natural Gas Only

Single-Stage Room Thermostat

(Order No. 350-0015-01)

• Low Voltage (24 V)

• 55 to 95°F Range

• 2-7/8” W x 4-3/4” H x 1-1/8” D

Single-Stage Duct Thermostat

(Order No. 350-0015-07)

• Low Voltage (24 V)

• 55 to 175°F Range

• 5’ Capillary

• 2” W x 5-5/8” H x 2-7/16” D

Electronic Modulating Duct

Thermostat

(Included with Gas Control)

• Low Voltage (24 V)

• 55 to 90°F Range

• Sensor: 10-inch Probe

• Remote Temperature Selector:

4-1/4” W 4-1/4” H 1-7/8” D

•Duct Thermostat:

4-1/4” W 4-1/4” H 1-5/8” D

• Natural Gas Only

Single-Stage Room Thermostat with

Summer/Winter Switch

(Order No. 350-0015-02)

• Low Voltage (24 V)

• 55 to 95°F Range

•Fan Auto-On Switch

• 3-1/2” W x 4-1/5” H x 1-3/8” D

Two-Stage Duct Thermostat

Order No. 350-0015-08)

• Low Voltage (24 V)

• 55 to 175°F Range

• 5’ Capillary

• 2” W x 5-5/8” H x 2-7/16” D

Electronic Modulating Override Room

Thermostat for use with Duct

Thermostats

(Order No. 350-0015-05)

• Line Voltage (115 V)

• 50 to 90°F Range

• 2-7/8” W 4-9/16” H 1-1/4” D

• Natural Gas Only

Two-Stage Room Thermostat

(Order No. 0135-THT025320-01, or

0135-THT02532G-01 with guard)

• Low Voltage (24 V)

• 42 to 88°F Range

•Fan Auto-On Switch

• System Off-Auto Switch

• 5-5/8” W x 3-1/2” H x 2-1/8” D

Universal Guard

(Order No. 350-0015-06)

• Clear Plastic

•Ring Base

• Tumbler Lock and Two Keys

• Cover: 6-7/8” W x 5-5/8” H x 3” D

• Base: 6-9/16” W x 5-1/2” H x 3/8” D

UH-PRC002-EN 33

Sequence of Operations

Typical wiring diagrams and sequence of operations for indoor units with intermittent pilot ignition

or direct spark ignition are included in this section. On duct furnaces, the fan motor and associated

controls shown in the wiring diagrams are not integral to the unit. It is essential, however, that the

air handling system be interlocked with the duct furnace to prevent duct furnace operation without

airflow.

Single-Stage Control

With power applied to the unit:

1. The thermostat calls for heat.

2. The pilot valve opens.

3. The ignitor sparks continuously to ignite the pilot.

4. The sensor proves pilot ignition and shuts off the ignitor.

5. With the pilot lit, the main gas valve opens.

6. Main burners are lit at 100 percent of unit’s rated input.

7. The fan time delay relay (optional on duct furnaces) allows the heat exchanger to come up to

operating temperature. At this time, the fan time delay relay closes and activates the fan motor.1

8. The unit continues to fire until the thermostat is satisfied and no longer calls for heat.

9. The main and pilot valves close.

10. The fan time delay relay remains closed, keeping the fan operating to dissipate residual heat

from the heat exchanger. At this time, the fan time delay relay opens and deactivates the fan

motor.

Note: This unit is equipped with a blocked vent shutoff (spill) switch. If the venting system

becomes blocked or there is continuous spillage, the vent shutoff switch will shut off the unit

heater.

1See “Fan Control,” p. 30.

• Caution - Disconnect power before

servicing.

• Unit must be grounded.

• Use copper conductors only.

• If any of the original wire as supplied

with the appliance must be replaced,

it must be replaced with wiring

material having a temperature rating

of at least 125°C.

• Refer to installation instructions for

venting, gas piping, and start-up

procedures.

• - - - Indicates Field Wiring.

• ___ Indicates Factory Wiring.

34 UH-PRC002-EN

Sequence of Operations

Two-Stage Control

With power applied to the unit:

1. The first stage of the thermostat calls for heat.

2. The pilot valve opens.

3. The ignitor sparks continuously to ignite the pilot.

4. The sensor proves pilot ignition and shuts off the ignitor.

5. With the pilot lit, the main gas valve opens to low fire.

6. Main burners are lit at 50 percent of unit’s rated input.

7. The fan time delay relay (optional on duct furnaces) allows the heat exchanger to come up to

operating temperature. At this time, the fan time delay relay closes and activates the fan motor.1

8. If additional heat is required, the second stage of the thermostat calls for heat.

9. The main gas valve opens to full fire. The main burners are now at full fire. The unit continues

at full fire until the second stage of the thermostat is satisfied and no longer calls for heat.

10. The main valve closes to low fire. The main burners are now at low fire. The unit continues at

low fire until the first stage of the thermostat is satisfied and no longer calls for heat.

11. The main and pilot valves close.

12. The fan time delay relay remains closed, keeping the fan operating to dissipate residual heat

from the heat exchanger. At this time, the fan time delay relay opens and deactivates the fan

motor.

Note: This unit is equipped with a blocked vent shutoff (spill) switch. If the venting system

becomes blocked or there is continuous spillage, the vent shutoff switch will shut off the unit

heater.

1See “Fan Control,” p. 30.

• Caution - Disconnect power before

servicing.

• Unit must be grounded.

• Use copper conductors only.

• If any of the original wire as supplied

with the appliance must be replaced,

it must be replaced with wiring

material having a temperature rating

of at least 125°C.

• High-limit and blocked vent (spill)

wires minimum 200°C.

• Refer to installation instructions for

venting, gas piping, and start-up

procedures.

• - - - Indicates Field Wiring.

• ___ Indicates Factory Wiring.

UH-PRC002-EN 35

Sequence of Operations

Electronic Modulating Control (with duct thermostat)

With power applied to the unit:

1. The thermostat calls for heat.

2. The pilot valve opens.

3. The ignitor sparks continuously to ignite the pilot.

4. The sensor proves pilot ignition and shuts off the ignitor.

5. With the pilot lit, the gas valve opens.

6. Main burners are lit at 100 percent of unit’s rated input.

7. The fan time delay relay (optional on duct furnaces) allows the heat exchanger to come up to

operating temperature. At this time, the fan time delay relay closes and activates the fan motor.

8. The unit is controlled by the duct thermostat which modulates the unit from 100 to 50 percent

of unit’s rated input. An amplifier receives a small electrical signal from the thermostat and

converts this into a working voltage. This working voltage determines the position of the

modulating valve. With no voltage applied to the valve, the valve will be full open and full fire

will occur. As increasing voltage is applied to the valve, the valve will modulate closed. At

approximately 12V dc, the valve will be at its minimum low fire position. If the voltage continues

to increase, indicating a further reduction in the unit’s firing is required, the increased voltage

closes a relay which closes the automatic gas valve. As temperature drops, the voltage also

drops causing the relay to re-open the valve. The unit will continue to cycle in this manner until

either an increase in the unit’s firing rate is required or the thermostat is satisfied and no longer

calls for heat.

9. When the thermostat is satisfied, the main and pilot valves close.

10. The fan time delay relay (optional on duct furnaces) remains closed keeping the fan motor

operating to dissipate residual heat from the heat exchanger. At this time, the fan time delay

relay opens and deactivates the fan motor.

11. If optional room override thermostat is ordered…when setpoint is reached, it will cause the unit

to go to full-fire, overriding both the duct sensor and the remote setpoint adjustment.

Note: Sensor and selector wires to amplifier must not be run close to, or in conduit with, power

or ignition wires.

36 UH-PRC002-EN

Sequence of Operations

Electronic Modulating Control (with Duct Thermostat)

t˚

L2

L1

DISCONNECT

LINE IN 115V/1/60

L1 FAN TIME DELAY

SUMMER/WINTER SWITCH

WS

8

8

L2

BLACK

BLACK

K5

BLOWER

MOTOR

DRAFTOR

HTR

DRAFTOR WIRING FOR

POWER VENTED UNITS

L2 LINE

24V XFORMER

50 VA

24

VOLTS

122

FAN TIME DELAY

DL

DL

R1

W1

L1

1

FURNACE ONE HIGH LIMIT

3

21

V

2

58600 IGNITOR

MV

MV/PV

PV

GND

24V (GND)

24V (HOT)

SPARK

BLKD.

VENT

IGN

12

DRAFTOR

END SW MV SOL.

PV SOL.

DRAFTOR ONE

K5

V

W1

DL

2

1

1

TS121 TD121

21

MAXITROL

W/ DUCT SENSING

4

3

14

1

5

7

9

10

8

11

MR1

ONE

HR VALVE

PER

FURNACE

SECTION

USE

A1010 FOR

SINGLE FUNACE

A1011 FOR

MULTIPLE FURNACE

2

UH-PRC002-EN 37

Sequence of Operations

Electronic Modulating Control (with room thermostat)

With power applied to the unit:

1. The thermostat calls for heat.

2. The pilot valve opens.

3. The ignitor sparks continuously to ignite the pilot.

4. The sensor proves pilot ignition and shuts off the ignitor.

5. With the pilot lit, the gas valve opens.

6. Main burners are lit at 100 percent of unit’s rated input.

7. The fan time delay relay (optional on duct furnaces) allows the heat exchanger to come up to

operating temperature. At this time, the fan time delay relay closes and activates the fan motor.1

8. The unit is controlled by the electronic thermostat which modulates the unit from 100 to 50

percent of unit’s rated input. An amplifier receives a small electrical signal from the thermostat

and converts this into a working voltage. This working voltage determines the position of the

modulating valve. With no voltage applied to the valve, the valve will be full open and full fire

will occur. As increasing voltage is applied to the valve, the valve will modulate closed. At

approximately 12 Vdc, the valve will be at its minimum low fire position. If the voltage continues

to increase, indicating a further reduction in the unit’s firing is required, the increased voltage

closes a relay which closes the automatic gas valve. As temperature drops, the voltage also

drops causing the relay to re-open the valve. The unit will continue to cycle in this manner until

either an increase in the unit’s firing rate is required or the thermostat is satisfied and no longer

calls for heat.

9. When the room thermostat is satisfied, the main and pilot valves close.

10. The fan time delay relay (optional on duct furnaces) remains closed keeping the fan motor

operating to dissipate residual heat from the heat exchanger. At this time, the fan time delay

relay opens and deactivates the fan motor.

1See “Fan Control,” p. 30.

38 UH-PRC002-EN

Sequence of Operations

Electronic Modulating Control (with room thermostat)

L2

L1

DISCONNECT

LINE IN 115V/1/60

L1 FAN TIME DELAY

SUMMER/WINTER SWITCH

WS

8

8

L2

BLOWER

MOTOR

DRAFTOR

MTR

K5

BLACK

BLACK

2

FAN TIME DEALY

DL

L2

L1

115V TO

24V XFORMER

50 VA

21 24

VOLTS

FURNACE ONE HIGH LIMIT

12

3R1

DL

W1

DRAFTOR ONE

K5

MV SOL.

PV SOL.

58600 IGNITOR

MV

MV/PV

PV

GND

24V (GND)

24V (HOT)

SPARK

PRESS. SW.

IGN

V

2

W1

DL

2

V

1

1

MAXITROL

W/ROOM SENSING

4

3

59

10

8

11

7

1

3

1

7

9

T107A

TSTAT

USE

A1010 FOR

SINGLE FURNACE

A1011 FOR

MULTIPLE FURNACE

2

ONE

HR VALVE

PER

FURNACE

SECTION

MR1

1

2

UH-PRC002-EN 39

Sequence of Operations

High-Efficiency Units

Note: On duct furnaces, the fan motor and associated controls shown in the wiring diagrams are

not integral to the unit. It is essential, however, that the air handling system be interlocked

with the duct furnace to prevent duct furnace operation without airflow.

Single-Stage Control, Intermittent Pilot

With power applied to the unit:

1. The thermostat calls for heat.

2. The pressure switch measures the flow through the vent system and energizes the intermittent

pilot when the flow is correct.

Important: CAUTION: THE PRESSURE SWITCH MUST NOT BE BYPASSED. THE UNIT MUST

NOT BE FIRED UNLESS THE FLUE VENT FAN IS OPERATING. If this procedure is not

followed, there may be a gas buildup that could cause an explosion.

3. The pressure switch closes and activates the flue vent fan.

4. The pilot valve opens.

5. The ignitor sparks continuously to ignite the pilot.

6. The sensor proves pilot ignition and shuts off the ignitor.

7. With the pilot lit, the main gas valve opens.

8. Main burners are lit at 100 percent of the unit’s rated input.

9. The fan time delay relay allows the heater to come up to operating temperature. At this time,

the fan time delay relay closes and activates the fan motor.1

10. The unit continues to fire until the thermostat is satisfied and no longer calls for heat.

11. The main and pilot valve close.

12. The fan time delay relay remains closed, keeping the fan operating to dissipate residual heat

from the heat exchanger. At this time, the fan time delay relay opens and deactivates the fan

motor.

1See “Fan Control,” p. 30.

• Caution - Disconnect power before

servicing.

• Unit must be grounded.

• Use copper conductors only.

• If any of the original wire as supplied

with the appliance must be replaced,

it must be replaced with wiring

material having a temperature rating

of at least 125°C.

• High-limit wires minimum 200°C.

• Refer to installation instructions for

venting, gas piping and start-up

procedures.

• - - - Indicates Field Wiring.

• ___ Indicates Factory Wiring.

L2

L1

L1

L1

L1

8

LINE IN

115-240/1/60

TIME DELAY

SUMMER

WINTER

RELAY 1

L2

L2

BLOWER

MOTOR

T1

115-240/24V

50VA

DRAFTOR

MTR.

2

1

R

RW

W

THERMOSTAT HIGH LIMIT

1

3

2

DRAFTOR

PRESS. SW. 58600

IGNITOR MV SOL.

MV

MV/PV

PV

GND

24V (HOT)

24V (GND)

SPARK IGN

PV SOL.

RELAY 1

R

TIME DELAY

TD

40 UH-PRC002-EN

Sequence of Operations

Two-Stage Control, Intermittent Pilot

With power applied to the unit:

1. The first stage of the thermostat calls for heat.

2. The pressure switch measures the flow through the vent system and energizes the intermittent

pilot when the flow is correct.

Important: CAUTION: THE PRESSURE SWITCH MUST NOT BE BYPASSED. THE UNIT MUST

NOT BE FIRED UNLESS THE FLUE VENT FAN IS OPERATING. If this procedure is not

followed, there may be a gas buildup that could cause an explosion.

3. The pressure switch closes and activates the flue vent fan.

4. The pilot valve opens.

5. The ignitor sparks continuously to ignite the pilot.

6. The sensor proves pilot ignition and shuts off the ignitor.

7. With the pilot lit, the main gas valve opens to low fire.

8. Main burners are lit at 50 percent of unit's rated input.

9. The fan time delay relay allows the heater to come up to operating temperature. At this time,

the fan time delay relay closes and activates the fan motor.1

10. If additional heat is required, the second stage of the thermostat calls for heat.

11. The main gas valve opens to full fire. The main burners are now at full fire. The unit continues

at full fire until the second stage of the thermostat is satisfied and no longer calls for heat.

12. The main valve closes to low fire. The main burners are now at low fire. The unit continues at

low fire until the first stage of the thermostat is satisfied and no longer calls for heat.

13. The fan time delay relay remains closed, keeping the fan operating to dissipate residual heat

from the heat exchanger. At this time, the fan time delay relay opens and deactivates the fan

motor.

1See “Fan Control,” p. 30.

• Caution - Disconnect power before

servicing.

• Unit must be grounded.

• Use copper conductors only.

• If any of the original wire as supplied

with the appliance must be replaced,

it must be replaced with wiring

material having a temperature rating

of at least 125°C.

• High-limit wires minimum 200°C.

• Refer to installation instructions for

venting, gas piping and start-up

procedures.

• - - - Indicates Field Wiring.

• ___ Indicates Factory Wiring.

UH-PRC002-EN 41

Sequence of Operations

Single-Stage Control, Direct Spark

With power applied to the unit:

1. The thermostat calls for heat.

2. The power venter is energized and the pressure switch measures the flow through the vent

system and energizes the direct spark ignition system beginning the pre-purge timing when the

flow is correct.

Important: CAUTION: THE PRESSURE SWITCH MUST NOT BE BYPASSED. THE UNIT MUST

NOT BE FIRED UNLESS THE FLUE VENT FAN IS OPERATING. If this procedure is not

followed, there may be a gas buildup that could cause an explosion.

3. The direct spark ignition lights the main gas. The sensing device has seven seconds to prove

flame.

4. The fan time delay in the board allows the heater to come up to operating temperature. At this

time, the fan time delay relay closes and activates the fan motor.1

5. The unit continues at full fire until the thermostat is satisfied and no longer calls for heat.

6. The main valve closes.

7. The fan time delay relay remains closed, keeping the fan operating to dissipate residual heat

from the heat exchanger. At this time, the fan time delay relay opens and deactivates the fan

motor.

1See “Fan Control,” p. 30.

• Caution - Disconnect power before

servicing.

• Unit must be grounded.

• Use copper conductors only.

• If any of the original wire as supplied

with the appliance must be replaced,

it must be replaced with wiring

material having a temperature rating

of at least 125°C.

• High-limit wires minimum 200°C.

• Refer to installation instructions for

venting, gas piping and start-up

procedures.

• - - - Indicates Field Wiring.

• ___ Indicates Factory Wiring.

42 UH-PRC002-EN

Sequence of Operations

Two-Stage Control, Direct Spark

With power applied to the unit:

1. The thermostat calls for heat.

2. The power venter is energized and the pressure switch measures the flow through the vent

system and energizes the direct spark ignition system beginning the pre-purge timing when the

flow is correct.

Important: CAUTION: THE PRESSURE SWITCH MUST NOT BE BYPASSED. THE UNIT MUST

NOT BE FIRED UNLESS THE FLUE VENT FAN IS OPERATING. If this procedure is not

followed, there may be a gas buildup that could cause an explosion.

3. The direct spark ignition lights the first stage main gas. The sensing device has seven seconds

to prove flame. Main burners are lit at 50 percent of unit's rated input.

4. The fan time delay in the board allows the heater to come up to operating temperature. At this

time, the fan time delay relay closes and activates the fan motor.1

5. If additional heat is required, the second stage of the thermostat calls for heat.

6. The main gas valve opens to full fire. The main burners are now at full fire. The unit continues

at full fire until the second stage of the thermostat is satisfied and no longer calls for heat.

7. The main valve closes to low fire. The main burners are now at low fire. The unit continues at

low fire until the first stage of the thermostat is satisfied and no longer calls for heat.

8. The gas valve closes.

9. The fan time delay relay remains closed, keeping the fan operating to dissipate residual heat

from the heat exchanger. At this time, the fan time delay relay opens and deactivates the fan

motor.

1See “Fan Control,” p. 30.

• Caution - Disconnect power before

servicing.

• Unit must be grounded.

• Use copper conductors only.

• If any of the original wire as supplied

with the appliance must be replaced,

it must be replaced with wiring

material having a temperature rating

of at least 125°C.

• High-limit wires minimum 200°C.

• Refer to installation instructions for

venting, gas piping and start-up

procedures.

• - - - Indicates Field Wiring.

• ___ Indicates Factory Wiring.

UH-PRC002-EN 43

Sequence of Operations

Separated Combustion Units

Single-Stage Control

With power applied to the unit:

1. The thermostat calls for heat.

2. The pressure switch measures the pressure differential between the air inlet and exhaust vent

systems. If the differential is correct, the intermittent pilot ignition is energized.

Important: CAUTION: THE PRESSURE SWITCH MUST NOT BE BYPASSED. THE UNIT MUST

NOT BE FIRED UNLESS THE FLUE VENT FAN IS OPERATING.

3. When the pressure switch is closed, the power venter motor is energized.

4. The pilot valve opens.

5. The ignitor sparks continuously to ignite the pilot.

6. The sensor proves pilot ignition and shuts off the ignitor.

7. With the pilot lit, the main gas valve opens.

8. Main burners are lit at 100 percent of the unit’s rated input.

9. The fan time delay relay allows the heater to come up to operating temperature. At this time,

the fan time delay relay closes and activates the fan motor.1

10. The unit continues to fire until the thermostat is satisfied and no longer calls for heat.

11. The main and pilot valve close.

12. The pressure switch opens and deactivates the gas control.

13. The fan time delay relay remains closed, keeping the fan operating to dissipate residual heat

from the heat exchanger. At this time, the fan time delay relay opens and deactivates the fan

motor.

1See “Fan Control,” p. 30.

• Caution - Disconnect power before

servicing.

• Unit must be grounded.

• Use copper conductors only.

• If any of the original wire as supplied

with the appliance must be replaced,

it must be replaced with wiring

material having a temperature rating

of at least 125°C.

• High-limit wires minimum 200°C.

• Refer to installation instructions for

venting, gas piping and start-up

procedures.

• - - - Indicates Field Wiring.

• ___ Indicates Factory Wiring.

L2

L1

DISCONNECT

LINE IN 115/1/60

L1 FAN TIME DELAY

L2

8

BLOWER/FAN

MOTOR

MTR

DRAFTOR

MOTOR

MTR

K5

BLACK

BLACK

LINE TO

24V XFORMER

50 VA

L2

8

12

24

VOLTS

2

SUMMER/WINTER SWITCH

WS

L1

FAN TIME DELAY

DL

DRAFTOR ONE

K5

MV SOL.

PV SOL.

58600 IGNITOR

MV

MV/PV

PV

GND

24V (GND)

24V (HOT)

SPARK

PRESS. SW.

IGN

1

2

V

W1

R1

DL

HIGH LIMIT 1

1

3

2

1

W1

DL

V

2

T/D STAT

RW/B

1

44 UH-PRC002-EN

Sequence of Operations

Separated Combustion Units—Single-Stage Control—Electronic Modulating

4–20 mA/0–10 Vdc Input

UH-PRC002-EN 45

Electrical Data

Table 18. Motor electrical data—centrifugal fan

Current

Characteristics

Full Load Amps(a)

(a) FLA based on NEC ratings. All motors are 1,725 rpm.

1/4 hp 1/3 hp 1/2 hp 3/4 hp 1 hp

115/60/1 5.0 5.9 7.2 11.0 14.0

230/60/1 2.5 3.3 3.9 5.5 7.0

208/60/3 NR NR 2.7 3.1 4.0

230/60/3 NR NR 2.4 2.8 3.6

460/60/3 NR NR 1.2 1.4 1.8

Note: NR = Motor available, but not rated by NEC.

Table 19. Motor electrical data—horizontal blower

Current

Characteristics

Full Load Amps(a)

(a) FLA based on NEC ratings. All motors are 1,725 rpm.

1/2 hp 1/2 hp 3/4 hp 1 hp 1-1/2 hp 2 hp 3 hp

115/60/1 5.9 7.2 11.0 14.0 16.4 24.6 34.0

230/60/1 3.3 3.9 5.5 7.0 8.2 12.3 17.0

208/60/3 NR 2.7 3.1 4.0 4.9 6.4 9.2

230/60/3 NR 2.4 2.8 3.6 4.4 5.8 8.6

460/60/3 NR 1.2 1.4 1.8 2.2 2.9 4.3

Motor weight (lb) 18 33 33 36 39 40 44

Note: NR = Motor available, but not rated by NEC.

46 UH-PRC002-EN

Dimensions and Weights

Table 20. Tubular Heat Exchanger dimensional data—model GTND/GTPD

Unit Sizes 30 45 60 75 90 105 120

“A” Jacket Height in. 12-3/8 12-3/8 15-7/8 15-7/8 22-5/8 22-5/8 22-5/8

mm 314 314 403 403 574 574 574

“B” Overall Height in. 13-1/4 13-1/4 16-13/16 16-13/16 23-9/16 23-9/16 23-9/16

mm 337 337 427 427 598 598 598

"C" Overall Depth in. 25-7/8 25-7/8 26-3/16 26-3/16 26-3/8 26-3/8 26-3/8

mm 632 632 665 665 670 670 670

“D1” Center Line Height of Flue in. 8-1/2 8-1/2 10-3/8 10-3/8 13-5/8 13-5/8 13-5/8

mm 216 216 364 364 346 346 346

“D2” Center Line Height of Air Intake in. 8-1/2 8-1/2 8 8 8-5/8 8-5/8 8-5/8

mm 216 216 203 203 219 219 219

“E” Fan Diameter in.10101414161616

mm 254 254 356 356 406 406 406

“F” Discharge Opening Height in. 10-13/16 10-13/16 14-7/16 14-7/16 21-3/16 21-3/16 21-3/16

mm 275 275 367 367 538 538 538

“G” Vent Connection Diameter in.4444444

mm 102 102 102 102 102 102 102

“H1” Center Line of Flue Connection From Side in. 7-1/4 7-1/4 7-1/4 7-1/4 7-3/4 7-3/4 7-3/4

mm 184 184 184 184 197 197 197

“H2” Center Line of Air Intake From Side in. 2-3/4 2-3/4 2-3/4 2-3/4 3-1/2 3-1/2 3-1/2

mm 70 70 70 70 89 89 89

Flue Size Requirements

Category I Horizontal(a) in.4445555

mm 102 102 102 127 127 127 127

Category III Horizontal in.4444444

mm 102 102 102 102 102 102 102

Category I & III Vertical in.4444444

mm 102 102 102 102 102 102 102

Unit Weight lb 60 65 80 85 95 105 110

kg 27 29 36 39 43 48 50

Shipping Weight lb 70 75 90 95 110 115 120

kg 32 34 41 43 50 52 54

Note: For all installations, the flue collar is included with the unit and should be field installed per the instructions included with the unit.

(a) 4–5” reducer supplied where required.

UH-PRC002-EN 47

Dimensions and Weights

Table 21. Tubular Heat Exchanger unit heater dimensional data—model GTND/GTPD

Input Diameter Gas Inlet Weight

Model MBh A B C D E F G H L Flue Fan Nat. LP Unit Shipping

015 150.0 in. 33-3/4 20-3/4 13-3/8 11 18-5/8 18-3/4 4-3/4 24-1/2 25-1/4 5 16 1/2 1/2 lb 155 195

mm 857 527 340 279 473 476 121 622 641 127 kg 70 88

017 175.0 in. 33-3/4 32-3/4 19-3/8 11 30-5/8 30-3/4 4-3/4 24-1/2 37-1/4 5 18 1/2 1/2 lb 191 241

mm 857 831 492 279 778 781 121 622 946 127 kg 87 109

020 200.0 in. 33-3/4 32-3/4 19-3/8 11 30-5/8 30-3/4 4-3/4 24-1/2 37-1/4 5 18 1/2 1/2 lb 201 251

mm 857 831 492 279 778 781 121 622 946 127 kg 91 114

025 250.0 in. 33-3/4 32-3/4 19-3/8 11 30-5/8 30-3/4 4-3/4 24-1/2 37-1/4 5 18 3/4 1/2 lb 211 261

mm 857 831 492 279 778 781 121 622 946 127 kg 96 118

1. Rear view

2. Side view

3. Front view

Dimensions are in

inches.

Dimensions in ( ) are in

millimeters.

123

48 UH-PRC002-EN

Dimensions and Weights

Table 22. Tubular Heat Exchanger unit heater dimensional data—model GTND/GTPD

Input Diameter Gas Inlet Weight

Model MBh A B C D E F G H L Flue Fan Nat. LP Unit Shipping

030 300.0 in. 34 50-3/4 28-3/8 12-1/4 48-5/8 48-3/4 5-1/8 24-1/2 55-1/4 6 (2) 16 3/4 1/2 or 3/4lb 307 367

mm 864 1289 721 311 1235 1238 130 622 1403 152 kg 139 166

035 350.0 in. 34 50-3/4 28-3/8 12-1/4 48-5/8 48-3/4 5-1/8 24-1/2 55-1/4 6 (2) 18 3/4 1/2 or 3/4lb 321 381

mm 864 1289 721 311 1235 1238 130 622 1403 152 kg 145 173

040 400.0 in. 34 50-3/4 28-3/8 12-1/4 48-5/8 48-3/4 5-1/8 24-1/2 55-1/4 6 (2) 18 3/4 1/2 or 3/4lb 335 395

mm 864 1289 721 311 1235 1238 130 622 1403 152 kg 152 179

1. Rear view

2. Side view

3. Front view

Dimensions are in

inches.

Dimensions in ( ) are in

millimeters.

1

23

UH-PRC002-EN 49

Dimensions and Weights

Table 23. High-efficiency propeller fan gas unit heater dimensional data—model GHND/GHPD

Unit Sizes 100 125 150 175 200 225 250 300 350 400

“A” Height to Top of Unit

in. 31.25 31.25 36.25 36.25 36.25 36.25 36.25 36.25 36.25 36.25

mm 794 794 921 921 921 921 921 921 921 921

“B” Width of Unit

in. 17.875 20.625 20.625 23.375 26.125 28.875 31.625 37.125 42.625 48.125

mm 454 524 524 594 664 733 803 943 1083 1222

“C” Height to Top of Hanger

in. 34.125 34.125 39.125 39.125 39.125 39.125 39.125 39.125 39.125 39.125

mm 867 867 994 994 994 994 994 994 994 994

“D” Depth to Rear of Housing

in. 37.5 37.5 37.5 37.5 37.5 37.5 37.5 37.5 37.5 37.5

mm 953 953 953 953 953 953 953 953 953 953

“E” Hanging Distance Width

in. 14.5 17.25 17.25 20 22.75 25.5 28.25 33.75 39.25 44.75

mm 368 438 438 508 578 648 718 857 997 1137

“F” Discharge Opening Width

in. 15.375 18.125 18.125 20.875 23.625 26.375 29.125 34.625 40.125 45.625

mm 391 460 460 530 600 670 740 879 1019 1159

“G” Depth to Unit Side Jacket

in. 26.75 26.75 26.75 26.75 26.75 26.75 26.75 26.75 26.75 26.75

mm 679 679 679 679 679 679 679 679 679 679

“H” Discharge Opening Height

in.1818181818 18 18 18 18 18

mm 457 457 457 457 457 457 457 457 457 457

“J” to Centerline of Flue

in. 5.872 7.25 7.25 8.625 10 11.25 12.75 15.5 18.25 21

mm 149 184 184 219 254 286 324 394 464 533

“K” Depth to Centerline of Flue

in. 30.625 30.625 30.625 30.625 30.625 30.625 30.625 30.625 30.625 30.625

mm 778 778 778 778 778 778 778 778 778 778

“L” Hanger Location

in. 16.25 16.75 16.375 16.375 16.375 16.75 16.75 16.75 16.75 16.75

mm 413 425 416 416 416 425 425 425 425 425

Flue Size Diameter(a)

in.44445 5 5 6 6 6

mm 102 102 102 102 127 127 127 152 152 152

Fan Diameter

in.1416161818 18 18 (2) 16(2) 18(2) 18c

Gas Inlet-Natural Gas

in. 0.5 0.5 0.5 0.5 0.5 0.75 0.75 0.75 0.75 0.75

Gas Inlet-LP Gas

in. 0.5 0.5 0.5 0.5 0.5 1/2 or 3/4 1/2 or 3/4 1/2 or 3/4 1/2 or 3/4 1/2 or 3/4

Approximate Shipping Weight

lb 174 197 219 238 249 275 305 350 414 461

kg 79 89 99 108 113 125 138 159 188 209

(a) The flue opening on all “GH” units is 5-1/8” diameter. Therefore, a transition adapter is required by installer on these units.

1. Side view, sizes

100–200

2. Side view, sizes

225–400

3. Front view,

sizes 30–400

*Canadian units

include vent cap and

reducer/increaser

(if required).

Dimensions in ( )

are in millimeters.

123

50 UH-PRC002-EN

Dimensions and Weights

Table 24. High-efficiency centrifugal fan unit heater dimensional data—model GBND/GBPD

Unit Sizes 100 125 150 175 200 225 250 300 350 400

“A” Height to Top of Unit

in. 31.25 31.25 36.25 36.25 36.25 36.25 36.25 36.25 36.25 36.25

mm 794 794 921 921 921 921 921 921 921 921

“B” Width of Unit

in. 17.875 20.625 20.625 23.375 26.125 28.875 31.625 37.125 42.625 48.125

mm 454 524 524 594 664 733 803 943 1083 1222

“C” Height to Top of Hanger

in. 34.125 34.125 39.125 39.125 39.125 39.125 39.125 39.125 39.125 39.125

mm 867 867 994 994 994 994 994 994 994 994

“D” Depth to Rear of Housing

in. 42.625 44.25 44.25 47 47 51 51 48.25 51 51

mm 1083 1124 1124 1194 1194 1295 1295 1226 1295 1295

“E” Hanging Distance Width

in. 14.5 17.25 17.25 20 22.75 25.5 28.25 33.75 39.25 44.75

mm 368 438 438 508 578 648 718 857 997 1137

“F” Discharge Opening Width

in. 15.375 18.125 18.125 20.875 23.625 26.375 29.125 34.625 40.125 45.625

mm 391 460 460 530 600 670 740 879 1019 1159

“J” to Centerline of Flue

in. 5.875 7.25 7.25 8.625 10 11.25 12.75 15.5 18.25 21

mm 149 184 184 219 254 286 324 394 464 533

“L” Hanger Location

in. 16.375 16.375 16.375 16.375 16.375 16.375 16.375 16.375 16.375 16.375

mm 416 416 416 416 416 416 416 416 416 416

“M” Hanging Distance Depth

in. 16.375 16.375 16.375 17.875 17.875 21.875 21.875 21.875 21.875 21.875

mm 416 416 416 454 454 556 556 556 556 556

Flue Size Diameter(a)

in.4444555666

mm 102 102 102 102 127 127 127 152 152 152

Blower Size in. 9 10 10 12 12 12 12 (2) 10 (2) 12 (2) 12

Gas Inlet-Natural Gas

in. 0.5 0.5 0.5 0.5 0.5 0.75 0.75 0.75 0.75 0.75

Gas Inlet-LP Gas

in. 0.5 0.5 0.5 0.5 0.5 1/2 or 3/4 1/2 or 3/4 1/2 or 3/4 1/2 or 3/4 1/2 or 3/4

Approximate Shipping Weight

lb 262 279 314 336 363 408 427 471 561 594

kg 119 127 142 152 165 185 194 214 254 269

(a) The flue opening on all “GB” units is 5-1/8” diameter. Therefore, a transition adapter is required by installer on these units.

1. Side view, sizes

100–200

2. Side view, sizes

225–400

3. Front view,

sizes 100–400

*Canadian units

include vent cap and

reducer/increaser

(if required).

Dimensions in ( )

are in millimeters.

123

UH-PRC002-EN 51

Dimensions and Weights

Table 25. Separated combustion propeller fan gas unit heater dimensional data—model GAND/GAPD

Unit Sizes 100 125 150 175 200 225 250 300 350 400

“A” Height to Top of Unit

in. 31.25 31.25 36.25 36.25 36.25 36.25 36.25 36.25 36.25 36.25

mm 794 794 921 921 921 921 921 921 921 921

“B” Height to Top of Hanger

in. 34.062 34.062 39.062 39.062 39.062 39.062 39.062 39.062 39.062 39.062

mm 865 865 992 992 992 992 992 992 992 992

“C” Hanging Distance Width

in. 14.75 17.5 17.5 20.25 23 25.75 28.5 34 39.5 45

mm 375 445 445 514 584 654 724 864 1003 1143

“D” Discharge Opening Width

in. 15.375 18.125 18.125 20.875 23.625 26.375 29.125 34.625 40.125 45.625

mm 391 460 460 530 600 670 740 879 1019 1159

“E” Width of Unit

in. 17.875 20.625 20.625 23.375 26.125 28.875 31.625 37.125 42.625 48.125

mm 454 524 524 594 664 733 803 943 1083 1222

“F” to Centerline of Flue

in. 5.875 7.25 7.25 8.625 10 11.25 12.75 15.5 18.25 21

mm 149 184 184 219 254 286 324 394 464 533

Flue Size Diameter(a)

in.4 4445 5 5 6 6 6

mm 102 102 102 102 127 127 127 152 152 152

Fan Diameter in. 14 16 16 18 18 18 18 (2) 16 (2) 18 (2) 18

Gas Inlet-Natural Gas

in. 0.5 0.5 0.5 0.5 0.5 0.75 0.75 0.75 0.75 0.75

Gas Inlet-LP Gas

in. 0.5 0.5 0.5 0.5 0.5 1/2 or 3/4 1/2 or 3/4 1/2 or 3/4 1/2 or 3/4 1/2 or 3/4

Approximate Shipping Weight

lb 200 228 256 284 312 340 368 432 488 545

kg 91 103 116 129 142 154 167 196 221 247

(a) The flue opening on all units is 5-1/8” diameter. Therefore, a transition adapter is required by installer on these units.

1. Front view,

sizes 100–400

2. Side view, sizes

100–200

3. Side view, sizes

225–400

Note: Air intake

is round on 225/

250 units. For

300/400 units,

air intake is as

shown.

*Canadian units

include vent cap and

reducer/increaser

(if required).

Dimensions in ( )

are in millimeters.

123

52 UH-PRC002-EN

Dimensions and Weights

Table 26. Separated combustion centrifugal fan unit heater dimensional data—model GKND/GKPD

Unit Sizes 100 125 150 175 200 225 250 300 350 400

“A” Height to Top of Unit

in. 31.25 31.25 36.25 36.25 36.25 36.25 36.25 36.25 36.25 36.25

mm 794 794 921 921 921 921 921 921 921 921

“B” Height to Top of Hanger

in. 34.062 34.062 39.062 39.062 39.062 39.062 39.062 39.062 39.062 39.062

mm 865 865 992 992 992 992 992 992 992 992

“C” Hanging Distance Width

in. 14.75 17.5 17.5 20.25 23 25.75 28.5 34 39.5 45

mm 375 445 445 514 584 654 724 864 1003 1143

“D” Discharge Opening Width

in. 15.375 18.125 18.125 20.875 23.625 26.375 29.125 34.625 40.125 45.625

mm 391 460 460 530 600 670 740 879 1019 1159

“E” Width of Unit

in. 17.875 20.625 20.625 23.375 26.125 28.875 31.625 37.125 42.625 48.125

mm 454 524 524 594 664 733 803 943 1083 1222

“F” to Centerline of Flue

in. 5.875 7.25 7.25 8.625 10 11.25 12.75 15.5 18.25 21

mm 149 184 184 219 254 286 324 394 464 533

“G” Hanging Distance Depth

in.18.518.518.520202323232323

mm 470 470 470 508 508 584 584 584 584 584

“H” Depth to Rear of Housing

in. 42.75 44.375 44.375 47.187 47.187 50.875 48 50.875 50.875 51

mm 1086 1127 1127 1199 1199 1292 1219 1292 1292 1295

Flue Size Diameter(a)

in.4 4445 5 5 6 6 6

mm 102 102 102 102 127 127 127 152 152 152

Blower Size in. 9 10 10 12 12 12 12 (2) 10 (2) 12 (2) 12

Gas Inlet-Natural Gas

in. 0.5 0.5 0.5 0.5 0.5 0.75 0.75 0.75 0.75 0.75

Gas Inlet-LP Gas

in. 0.5 0.5 0.5 0.5 0.5 1/2 or 3/4 1/2 or 3/4 1/2 or 3/4 1/2 or 3/4 1/2 or 3/4

Approximate Shipping Weight

lb 298 330 362 394 426 458 490 558 618 678

kg 135 150 164 179 193 208 222 253 280 308

(a) The flue opening on all units is 5-1/8” diameter. Therefore, a transition adapter is required by installer on these units.

1. Front view,

sizes 100–400

2. Side view, sizes

100–200

3. Side view, sizes

225–400

Note: Air intake

is round on 225/

250 units. For

300/400 units,

air intake is as

shown.

*Canadian units

include vent cap and

reducer/increaser

(if required).

Dimensions in ( )

are in millimeters.

123

UH-PRC002-EN 53

Dimensions and Weights

Table 27. High-efficiency duct furnaces—model GLND/GLPD

Input D

(Dia.)

Gas Inlet

Model MBh A B C F Nat. LP Weight

010 100

in. 17.875 15.5 17.125 4 23.875 1/2 1/2 lb 173

mm 454 394 435 102 606 kg 78

012 125 in. 20.625 18.25 19.875 4 25.625 1/2 1/2 lb 186

mm 524 464 505 102 651 kg 84

015 150 in. 20.625 18.25 19.875 4 26.625 1/2 1/2 lb 197

mm 524 464 505 102 676 kg 89

017 175 in. 23.375 21 22.625 4 29.375 1/2 1/2 lb 216

mm 594 533 575 102 746 kg 98

020 200 in. 26.125 23.75 25.375 5 32.125 1/2 1/2 lb 232

mm 664 603 645 127 816 kg 105

022 225 28.875 26.5 28.125 5 34.875 3/4 1/2 or 3/4lb 254

733 673 714 127 886 kg 115

025 250 in. 31.625 29.25 30.875 5 37.625 3/4 1/2 or 3/4 lb 263

mm 803 743 784 127 956 kg 119

030 300 in. 37.125 34.75 36.375 6 43.125 3/4 1/2 or 3/4 lb 312

mm 943 883 924 152 1095 kg 142

035 350 in. 42.625 40.25 41.875 6 48.625 3/4 1/2 or 3/4 lb 389

mm 1083 1022 1064 152 1235 kg 176

040 400 in. 48.125 45.75 47.375 6 54.125 3/4 1/2 or 3/4 lb 403

mm 1222 1162 1203 152 1375 kg 183

1. Side view, sizes 100–125

2. Front view, sizes 100–400

3. Side view, sizes 150–400

4. Side view, sizes 100–125

5. Front view, sizes 100–400

6. Side view, sizes 150–400

7. Detail G positions: front,

rear, right, left

*Canadian units

include vent cap

and reducer/

increaser (if

required).

Rear vent position

shown. See Detail G

for optional top vent

position.

Dimensions are in

inches.

Dimensions in ( )

are in millimeters.

123

456

7

54 UH-PRC002-EN

Dimensions and Weights

Table 28. Separated combustion indoor gas duct furnaces—model GMND/GMPD

Input D

(Dia.)(a)

Gas Inlet

Model MBh A B C Nat. LP Weight

010 100

in. 17-7/8 15-1/2 17-1/8 4 1/2 1/2 lb 161

mm 454 394 435 102 kg 73

012 125 in. 20-5/8 18-1/4 19-7/8 4 1/2 1/2 lb 180

mm 524 464 505 102 kg 82

015 150 in. 20-5/8 18-1/4 19-7/8 4 1/2 1/2 lb 188

mm 524 464 505 102 kg 85

017 175 in. 23-3/8 21 22-5/8 4 1/2 1/2 lb 207

mm 594 533 575 102 kg 94

020 200 in. 26-1/8 23-3/4 25-3/8 5 1/2 1/2 lb 227

mm 664 603 645 127 kg 103

022 225 28-7/8 26-1/2 28-1/8 5 3/4 1/2 or 3/4lb 246

733 673 714 127 kg 112

025 250 in. 31-5/8 29-1/4 30-7/8 5 3/4 1/2 or 3/4lb 266

mm 803 743 784 127 kg 121

030 300 in. 37-1/8 34-3/4 36-3/8 6 3/4 1/2 or 3/4lb 305

mm 943 883 924 152 kg 138

035 350 in. 42-5/8 40-1/4 41-7/8 6 3/4 1/2 or 3/4lb 344

mm 1083 1022 1064 152 kg 156

040 400 in. 48-1/8 45-3/4 47-3/8 6 3/4 1/2 or 3/4lb 383

mm 1222 1162 1203 152 kg 174

(a)“D” diameter equals the air inlet opening and the flue discharge opening.

1. Sizes 100–250

2. Sizes 300–400

†Oval connector shown accepts 6” Dia.

(152) pipe.

*Canadian units include vent cap and

reducer/increaser (if required).

Rear vent position shown. See Detail G for

optional top vent position.

Dimensions are in inches.

Dimensions in ( ) are in millimeters.

123

UH-PRC002-EN 55

Dimensions and Weights

Table 29. Horizontal blower assembly dimension data

Nominal Input Filter Ship

Model cfm MBh(a) A B C D E F G Size** # Req. Weight(b)

HBAC-15 1500 100 in. 65-1/2 26 10 18 21-1/4 15-3/4 15-5/8 25 x 25 x 1 1 lb 135

mm 1664 660 254 457 540 400 397 kg 61

125 in. 65-1/2 26 10 18 21-1/4 15-3/4 18-3/8 25 x 25 x 1 1 lb 135

mm 1664 660 254 457 540 400 467 kg 61

HBAC-20 2000 150 in. 65-1/2 26 10 18 21-1/4 15-3/4 18-3/8 25 x 25 x 1 1 lb 155

mm 1664 660 254 457 540 400 467 kg 70

175 in. 65-1/2 26 10 18 21-1/4 15-3/4 21-1/8 25 x 25 x 1 1 lb 155

mm 1664 660 254 457 540 400 537 kg 70

HBAC-30 3000 200 in. 65-1/2 40-1/2 10 18 35-3/4 30-3/8 23-7/8 25 x 20 x 1 2 lb 200

mm 1664 1029 254 457 908 772 606 kg 91

225 in. 65-1/2 40-1/2 10 18 35-3/4 30-3/8 26-5/8 25 x 20 x 1 2 lb 200

mm 1664 1029 254 457 908 772 676 kg 91

250 in. 65-1/2 40-1/2 10 18 35-3/4 30-3/8 29-3/8 25 x 20 x 1 2 lb 200

mm 1664 1029 254 457 908 772 746 kg 91

HBAC-45 4500 300 in. 65-1/2 60-1/2 10 18 55-3/4 50-3/8 34-7/8 25 x 20 x 1 3 lb 296

mm 1664 1537 254 457 1416 1280 886 kg 134

350 in. 69-1/2 60-1/2 14 22 55-3/4 50-3/8 40-3/8 25 x 20 x 1 3 lb 296

mm 1765 1537 356 559 1416 1280 1026 kg 134

400 in. 69-1/2 60-1/2 14 22 55-3/4 50-3/8 45-7/8 25 x 20 x 1 3 lb 296

mm 1765 1537 356 559 1416 1280 1165 kg 134

Notes:

1. Nominal 4,500 cfm unit has two blowers driven by one motor.

2. Transition designed for specific duct furnace referenced in the table above. Variations from standard will require field-supplied transitions.

(a)Size of duct furnace used with horizontal blower assembly.

(b)Ship weight is approximate and does not include motor.

Dimensions are in inches.

Dimensions in ( ) are in millimeters.

56 UH-PRC002-EN

Dimensions and Weights

Table 30. Factory-installed flue vent data (standard on high-efficiency units)

Unit Size

Input MBh 30 45 60 75 100 125 150 175 200 225 250 300 350 400

Flue Outlet in. 5-1/8 5-1/8 5-1/8 5-1/8 5-1/8 5-1/8 5-1/8 5-1/8 5-1/8 5-1/8 5-1/8 5-1/8 5-1/8 5-1/8

Recommended Flue Size

in. 4 R 4 R 4 R 4 R 4 R 4 R 4 R 4 R 5 R 5 R 5 R 6 R 6 R 6 R

Maximum Length of Run(a)

ft 50 50 50 50 50 50 50 50 50 50 50 50 50 50

Notes:

1. Horizontal vent pipes should be pitched downward 1/4-inch per foot toward the outlet for condensate drainage.

2. Motors are 1/20 hp. All fans are 115 V and draw 1.5 amps.

(a) Vent pipe equivalent length must not exceed 50 feet. Equivalent length is the total length of straight sections, plus 15 feet for each 90° elbow and 8

feet for each 45° elbow.

Table 31. Factory-installed flue vent data (standard on separated combustion units)

Unit Size

Input MBh 30 45 60 75 100 125 150 175 200 225 250 300 350 400

Flue Flue Outlet in. 5-1/8 5-1/8 5-1/8 5-1/8 5-1/8 5-1/8 5-1/8 5-1/8 5-1/8 5-1/8 5-1/8 5-1/8 5-1/8 5-1/8

Recommended Flue Size

in. 4 R 4 R 4 R 4 R 4 R 4 R 4 R 4 R 5 R 5 R 5 R 6 R 6 R 6 R

Maximum Length of Run(a)

ft 50 50 50 50 50 50 50 50 50 50 50 50 50 50

Combustion Air

Combustion Air Inlet

in. 4 R 4 R 4 R 4 R 4 R 4 R 4 R 4 R 5 R 5 R 5 R 6 OV 6 OV 6 OV

Maximum Length of Run(a)

ft 50 50 50 50 50 50 50 50 50 50 50 50 50 50

Notes:

1. Horizontal vent pipes should be pitched downward 1/4-inch per foot toward the outlet for condensate drainage.

2. Motors are 1/20 hp. All fans are 115 V and draw 1.5 amps.

(a) Flue outlet or combustion air inlet pipe equivalent length must not less than 5 feet and must not exceed 50 feet. Equivalent length is the total length

of straight sections, plus 15 feet for each 90° elbow and 8 feet for each 45° elbow.

UH-PRC002-EN 57

Dimensions and Weights

1. 30° nozzle

2. 60° nozzle

3. 90° nozzle

Note: 30°, 60°, and 90° nozzles are shipped unassembled with bagged hardware and field assembling and installation

instruction sheet. The six (6) louvers and louver springs are removed from the unit heaters and transferred to the

nozzles in the field.

4. Y-splitter

1

2

3

4

Table 32. Nozzle dimensional data

Unit MBh 100 125 150 175 200 225 250 300 350 400

Ain. 17.44 20.19 20.19 22.94 25.69 28.44 31.19 36.69 42.19 47.69

mm 445 513 513 583 653 722 792 932 1072 1211

Bin. 15.368 18.118 18.118 20.868 23.618 26.368 29.118 34.618 40.118 45.618

mm 391 460 460 530 600 670 740 879 1019 1159

Table 33. Y-splitter dimensional data

Unit MBh 100 125 150 175 200 225 250 300 350 400

Width in. 15-3/8 18-1/8 18-1/8 20-7/8 23-5/8 26-3/8 29-1/8 34-5/8 40-1/8 45-5/8

mm 391 461 461 527 600 671 740 880 1019 1159

Height in. 21-1/8 21-1/8 21-1/8 21-1/8 21-1/8 21-1/8 21-1/8 21-1/8 21-1/8 21-1/8

mm 537 537 537 537 537 537 537 537 537 537

Depth in. 11 11 11 11 11 13-1/8 13-1/8 15-1/8 20-5/8 20-5/8

mm 279 279 279 279 279 334 334 384 524 524

58 UH-PRC002-EN

Mechanical Specifications

Tubular Heat Exchanger Indoor Gas Unit (model GT)

Unit is completely factory assembled, piped, wired and test fired. Unit is AGA and CGA certified,

over 80 percent thermal (combustion) efficient. These propeller type units are provided with

aluminized tubular heat exchanger, in-shot burner, hot surface pilot ignition, individually

adjustable and removable louvers, 100 percent baked enamel finish, 115/60/1 supply voltage,

removable access door on size 30 to 120 MBh, and hinged access control panel on 150 to 400 MBh,

power vented, single-stage combination gas valve, two-stage available on 150 to 400 MBh, 24V

control transformer and 115/60/1 volt fan motor with internal overload protection. The size 30 to

120 MBh are available in low profile design. OSHA fan guard is standard on all units size 30 to

120 MBh. Units sized 150 to 400 MBh are shipped with a non-OSHA type guard; the OSHA guard

is available as a selectable option.

Tubular Heat Exchanger

Heat exchanger construction consists of 20-gauge aluminized steel. The tubular design provides

maximum and uniform heat transfer. The low pressure drop enables heated air to be evenly

distributed. The curved, non-welded serpentine design, experiences less thermally induced stress

making it highly durable for longer service life.

Cabinet

The cabinet is constructed of 20-gauge cold rolled steel. All components are individually

electrostatically painted.

Hot Surface Pilot Ignition

This ignition is constructed of shock resistant ceramic composite hot surface element. This system

does not permit pilot gas to flow unless the hot surface element is present and powered. The low

voltage hot surface element lights the pilot quickly for fast heat delivery. All wiring is 24V with no

line voltage in the burner area.

Venting

The tubular design is AGA/CGA certified in accordance with Categories I and III venting

requirements. Category I enables units to be vented vertically with either single or double wall

venting material. Category III allows for horizontal venting utilizing single wall venting material.

This venting flexibility makes installation easier and more cost effective.

Control Accessibility

All controls are easily accessible with ignition and fan controls located in one centrally located

control panel. The removable door on size 30 to 75 MBh and the hinged access door on the 100 to

400 MBh provide control isolation.

Motor –115V ODP

Motor is 115V, 60 Hz, single phase, open drip-proof with built-in thermal overload protection.

Optional Feature

Motor — 115V totally enclosed. Motor is 115V, 60 Hz, single phase, totally enclosed with built-in

thermal overload protection.

Warranty

The heat exchanger, flue collector and burners are covered by a 10-year warranty from the date of

manufacture.

UH-PRC002-EN 59

Mechanical Specifications

High Efficiency Propeller (model GH) and Centrifugal Fan Gas Unit Heaters (model GB)

General

Units are completely factory assembled, piped, wired, and test fired. All units are AGA Certified and

conform with the latest ANSI Standards for safe and efficient performance. Units are provided with

two-point suspension hangers on propeller fan unit heaters and with four-point suspension

hangers on centrifugal fan unit heaters. All units are available for operation on either natural or LP

(liquid propane) gas.

Casing

Casings are die-formed, 20-gauge galvanized steel and finished in baked enamel. The bottom panel

is easily removed to provide service access to the burners, pilot and orifices. The pilot is also

accessible through a side panel access plate. All units are provided with independently adjustable

horizontal louvers with stops to prevent total closure.

Heat Exchanger

Standard heat exchanger construction consists of seam welded 20-gauge aluminized steel tubes

and 18-gauge aluminized steel headers.

The heat exchanger, burner, and draft hood assembly carry a non-prorated warranty to be free from

defective material and workmanship for a period of ten years from date of manufacture, excluding

loss due to misuse, negligence, or corrosion by chemicals precipitated in the air.

Burners

Burners are die-formed, corrosion resistant aluminized steel, with stainless steel port protectors.

Port protectors reduce scale or foreign matter from obstructing the burner ports. Burners are

individually removable for ease of inspection and servicing. Each burner is provided with an

individually adjustable, manually rotated air shutter adjustment.

Fans

Fan blades are constructed of aluminum with an aerodynamic contour. All fans are dynamically

balanced for quiet, efficient operation and supplied with a protective type fan guard. Rubber-in-

shear isolators provide isolation between the fan/motor combination and the unit heater casing.

All Motors

Standard motors are 115V, 60 Hz, single phase, open drip-proof with built-in thermal overload

protection.

Optional Fan Unit Motors

All motors are 115V, 60 Hz, single-phase totally enclosed with built-in thermal overload protection

and permanently lubricated bearings.

Controls

A factory installed junction box is provided for all power connections. Standard units are provided

with a 24V combination single stage redundant gas valve, consisting of a combination pilot

solenoid valve, automatic electric gas valve, pilot filter, pressure regulator, pilot adjustment and

manual shutoff. A flue vent fan relay and combustion air proving switch is also provided as

standard. Standard equipment includes spark-ignited intermittent pilot system with electronic

flame supervision. A 24V control transformer, high limit and fan time delay relay are provided. The

fan time delay relay delays the fan start until the heat exchanger reaches a predetermined

temperature. It also allows the fan to operate after burner shutdown, removing residual heat from

the heat exchanger.

60 UH-PRC002-EN

Mechanical Specifications

Two-Stage Gas Valve

Provides two stages of heat. Ignition is at low fire (50 percent of the furnace’s rated input). Requires

the use of a two-stage thermostat.

Electronic Modulating Gas Valve (Natural Gas Units Only)

Provides modulated heat output. Ignition is at full fire (100 percent input), and modulates the gas

input from 100 percent to 50 percent rated input. Available for use with room thermostat or duct

thermostat with remote setpoint adjustment. Duct thermostat available with optional override

room thermostat which causes the unit to go to full fire when the room temperature falls below the

override room thermostat.

Electronic Modulating, 4–20 mA/0–10 Vdc Input

Provides modulated heat output. Ignition is at full fire (100 percent input), and modulates the gas

input from 100 percent to 40 percent rated input. The modulating gas valve shall operate in

response to a 4–20 mA or a 0–10 Vdc input from an external DDC control.

Flue Vent Fan

Flue vent fan provides power venting. Provided factory assembled to a sealed flue collection

chamber. The flue vent fan is activated in response to a low voltage (24V) single-stage thermostat.

Note: Thermostat must be ordered.

A combustion air pressure switch is provided as standard to verify proper powered vent flow prior

to allowing the gas valve to operate.

Factory-Installed Options

Heat Exchanger Options

Type 409 Stainless Steel

Heat exchanger tubes and headers are seam welded 20-gauge Type 409 stainless steel.

Type 321 Stainless Steel

Heat exchanger tubes and headers are seam welded 20-gauge Type 321 stainless steel. (Not

available on 30, 45, 60 and 75 MBh units.)

Additional Options

Type 409 Stainless Steel Burners

Type 409 Stainless Steel Draft Diverter

Orifices for elevations over 2,000 feet

Summer/Winter Switch

Vertical Louvers

Duct Discharge Flange (Centrifugal fan units only) Provided in lieu of louvers on units for use with

field ductwork.

OSHA Fan Guards—All Propeller Units

OSHA fan guards are available as a factory-installed or field-installed option.

Field-Installed Accessories

High Gas Line Pressure Regulator (Natural gas units only)

Reduces main gas line pressure to a minimum of seven inches wc (water column). Pressure at the

jobsite must be specified. The regulator is selected to accommodate that specific pressure.

UH-PRC002-EN 61

Mechanical Specifications

Thermostats

Low voltage room thermostat, single-stage.

Low voltage room thermostat, single-stage with summer/winter switch.

Low voltage duct thermostat, single-stage.

Universal tamper-proof guard for all room thermostats.

Low voltage room thermostat, two-stage.

Low voltage duct thermostat, two-stage.

Room thermostat, electronic modulating control.

Duct thermostat, electronic modulating control.

Override room thermostat, for use with duct thermostat and electronic modulating control.

Discharge Nozzles

Y Splitter

30° Downward

60° Downward

90° Downward

Separated Combustion Centrifugal (model GK) and Propeller Fan Gas Unit Heaters

(model GA)

General

Units are completely factory assembled, piped, wired, and test fired. All units are AGA Certified,

80 percent efficient and conform with the latest ANSI Standards for safe and efficient performance.

Units are provided with two-point suspension hangers on propeller fan unit heaters and with four-

point suspension hangers on centrifugal fan unit heaters. Units are available for operation on either

natural or LP (propane) gas. Standard terms and conditions apply.

Casing

Casings are die-formed, 20-gauge galvanized steel and finished in baked enamel. The bottom panel

is easily removed to provide service access to the burners, pilot and orifice. All units provided with

independently adjustable horizontal louvers with stops to prevent total closure.

Heat Exchanger

Standard heat exchanger construction consists of seam welded 20-gauge aluminized steel tubes

and 18-gauge aluminized steel headers.

Burners

Burners are die-formed, corrosion resistant aluminized steel, with stainless steel port protectors.

Port protectors prevent scale or foreign matter from obstructing the burner ports. Burners

individually removable for ease of inspection and servicing. Each burner is provided with an

individually adjustable, manually rotated air shutter adjustment.

Fans

Propeller fan blades are constructed of aluminum with an aerodynamic contour.

All fans are dynamically balanced for quiet, efficient operation and supplied with a protective type

fan guard. Rubber-in-shear isolators provide isolation between the fan/motor combination and the

unit heater casing.

Centrifugal fan is belt driven with adjustable pitch motor sheave. Motor and fan are dynamically

balanced for quiet operation.

62 UH-PRC002-EN

Mechanical Specifications

Centrifugal Unit Motors

Standard motors are 115V, 60 Hz, single phase, open drip-proof with built-in thermal overload

protection. Optional 230/60/1 motors are available on all units. Optional 208, 230, 460/60/3 motors

are available on 125 through 400 MBh units.

All Motors

All motors are 115V, 60 Hz, single-phase open drip-proof with built-in thermal overload protection

and permanently lubricated bearings.

Controls

A factory installed junction box is provided for all power connections. Standard units are provided

with a 24V combination single-stage redundant gas valve, consisting of a combination pilot

solenoid valve, automatic electric gas valve, pilot filter, pressure regulator, pilot adjustment and

manual shutoff. A flue vent fan relay and combustion air proving switch is also provided as

standard. Standard equipment includes spark-ignited intermittent pilot system with electronic

flame supervision. A 24V control transformer, high limit and fan time delay relay are provided. The

fan time delay relay delays the fan start until the heat exchanger reaches a predetermined

temperature. It also allows the fan to operate after burner shutdown, removing residual heat from

the heat exchanger.

Electronic Modulating, 4–20 mA/0–10Vdc Input

Provides modulated heat output. Ignition is at full fire (100 percent input), and modulates the gas

input from 100 percent to 40 percent rated input.

The modulating gas valve shall operate in response to a 4–20 mA or a 0–10 Vdc input from an

external DDC control.

Flue Vent Fan

Flue vent fan provides power venting. Provided factory assembled to a sealed flue collection

chamber. The flue vent fan is activated in response to a low voltage (24V) single-stage thermostat.

Note: The thermostat is not included with the gas control option).

A combustion air pressure switch is provided as standard to verify proper powered vent flow prior

to allowing the gas valve to operate.

Factory-Installed Options

Two-Stage Gas Valve

Provides two stages of heat. Ignition is at low fire (50 percent of the furnaces rated input). Requires

the use of a two-stage thermostat.

Heat Exchanger Options

Type 409 Stainless Steel

Heat exchanger tubes and headers are seam welded 20-gauge Type 409 stainless steel.

Type 321 Stainless Steel

Heat exchanger tubes and headers are seam welded 20-gauge Type 321 stainless steel.

Additional Options

Type 409 Stainless Steel Burners

Type 409 Stainless Steel Draft Diverter

Totally Enclosed Motor

Orifices for elevations over 2000 feet

UH-PRC002-EN 63

Mechanical Specifications

Summer/Winter Switch

Vertical Louvers

Duct Discharge Flange

(Centrifugal fan units only) Provided in lieu of louvers on units for use with field ductwork.

OSHA Fan Guards

OSHA fan guards are available as a factory installed or field installed option.

Field-Installed Accessories

LP (Propane) to Natural Gas Conversion Package

High Gas Line Pressure Regulator (Natural gas units only)

Reduces main gas line pressure to a minimum of seven-inches wc (water column). Pressure at the

jobsite must be specified. The regulator is selected to accommodate that specific pressure.

Thermostats

Low voltage room thermostat, single-stage.

Low voltage room thermostat, single-stage with summer/winter switch.

Low voltage duct thermostat, single-stage.

Low voltage room thermostat, two-stage.

Low voltage duct thermostat, two-stage.

Universal tamperproof guard for all room thermostats.

Discharge Nozzles

Y Splitter

30° Downward

60° Downward

90° Downward

Concentric Vent Terminals

Vertical Concentric Vent Kit

Kit includes 5” cap with special attached non-recirculation disc, special 8” cap with 5” hole and

concentric vent box.

Horizontal Concentric Vent Kit

Kit includes 5” cap with special attached non-recirculation disc, inlet air screen and concentric vent

box.

High Efficiency Indoor Gas Duct Furnaces (model GL)

General

Units are completely factory assembled, piped, wired, and test fired. All units are AGA Certified and

conform with the latest ANSI Standards for safe and efficient performance. Units are provided with

four point suspension hangers, and are available for operation on either natural or LP (propane)

gas.

Casing

Casings are die-formed, 20-gauge galvanized steel and finished in baked enamel. The bottom panel

is easily removed to provide access to the burners, pilot, and orifices. The pilot is also accessible

64 UH-PRC002-EN

Mechanical Specifications

through a side panel access plate. The high limit switch is accessible through a side panel access.

Duct discharge flanges for simple ductwork connection are provided.

Heat Exchanger

Standard heat exchanger construction consists of seam welded 20-gauge aluminized steel tubes

and 18-gauge aluminized steel headers.

Burners

Burners are die-formed, corrosion resistant aluminized steel, with stainless steel port protectors.

Port protectors prevent foreign matter from obstructing the burner ports. Burners individually

removable for ease of inspection and servicing. Each burner is provided with an individually

adjustable, manually rotated air shutter adjustment. Air shutter adjustment is fixed when side

access burner drawer is supplied.

Controls

A factory installed junction box is provided for all power connections. Standards units are provided

with a 24-volt combination single-stage redundant gas valve, consisting of a combination pilot

solenoid valve, automatic electric gas valve, pilot filter, pressure regulator, pilot adjustment and

manual shutoff. A flue vent fan relay and combustion air proving switch is also provided as

standard. Standard equipment includes spark-ignited intermittent pilot system with electronic

flame supervision. A 24V control transformer and a high limit are provided.

Flue Vent Fan

Flue vent fan is factory assembled to a sealed flue collection chamber and provides power venting.

The flue vent fan is activated in response to a low voltage (24V) single-stage thermostat. A

combustion air pressure switch is provided as standard to verify proper powered vent flow prior

to allowing the gas valve to operate.

Control Options

Two-Stage Gas Valve

Provides two stages of heat. Ignition is at low fire (50 percent of the furnace’s rated input). Requires

the use of a two-stage thermostat. (Thermostat not included.)

Electronic Modulating Gas Valve (Natural Gas Units Only)

Provides modulated heat output. Ignition is at full fire (100 percent input), and modulates the gas

input from 100 percent to 50 percent rated input. Available for use with room thermostat or duct

thermostat with remote setpoint adjustment. Duct thermostat available with optional override

room thermostat which causes the unit to go to full fire when the room temperature falls below the

override room thermostat.

Electronic Modulating 4–20 mA/0–10 Vdc Input

Provides modulated heat output. Ignition is at full fire (100 percent input), and modulates the gas

input from 100 percent to 40 percent rated input. The modulating gas valve shall operate in

response to a 4–20 mA or a 0–10 Vdc input from an external DDC control.

Heat Exchanger Options

Type 409 Stainless Steel

Heat exchanger tubes and headers are seam welded 20-gauge Type 409 stainless steel

Type 321 Stainless Steel

Heat exchanger tubes and headers are seam welded 20-gauge Type 321 stainless steel

UH-PRC002-EN 65

Mechanical Specifications

Additional Options

Type 409 Stainless Steel Burners

Orifices for Elevations over 2000 feet

Type 409 Stainless Steel Draft Diverter

Summer/Winter Switch

Horizontal Louvers

Horizontal and Vertical Louvers

Side Access Burner Drawer

Allows entire burner drawer to slide out from the side of the unit for service or inspection.

Fan Time Delay Relay

The fan time delay relay delays the fan start until the heat exchanger reaches a predetermined

temperature. It also allows the fan to operate after burner shutdown, removing the residual heat

from the heat exchanger. (Recommended on applications that require intermittent fan.)

Field-Installed Accessories

Natural to LP (Propane) Gas Conversion Package (Standing Pilot Only)

LP (Propane) to Natural Gas Conversion Package

High Gas Line Pressure Regulator—Reduces main gas line pressure to a minimum of 7 inches wc

(water column). Pressure at the jobsite must be specified. The regulator is selected to

accommodate that specific pressure.

Discharge Nozzles

“Y” Splitter

30° Downward

60° Downward

90° Downward

Drain Pan

Recommended for use with installations on the downstream side of a cooling coil.

Thermostats

Low voltage room thermostat, single-stage

Low voltage room thermostat, two-stage

Low voltage duct thermostat, single-stage

Low voltage duct thermostat, two-stage

Universal tamper-proof guard for all room thermostats

Low voltage room thermostat, single-stage with summer/winter switch

Room thermostat, electronic modulating control

Duct thermostat, electronic modulating control

Override room thermostat, for use with duct thermostat and electronic modulating control.

Separated Combustion Duct Furnaces (model GM)

General

Units are completely factory assembled, piped, wired, and test fired. All units are AGA Certified,

80 percent efficient and conform with the latest ANSI Standards for safe and efficient performance.

66 UH-PRC002-EN

Mechanical Specifications

Units are provided with two-point suspension hangers on propeller fan unit heaters and with four-

point suspension hangers on centrifugal fan unit heaters. Units are available for operation on either

natural or LP (propane) gas. Standard terms and conditions apply.

Casing

Casings are die-formed, 20-gauge galvanized steel and finished in baked enamel. The bottom panel

is easily removed to provide service access to the burners, pilot and orifice. All units provided with

independently adjustable horizontal louvers with stops to prevent total closure.

Heat Exchanger

Standard heat exchanger construction consists of seam welded 20-gauge aluminized steel tubes

and 18-gauge aluminized steel headers.

Burners

Burners are die-formed, corrosion resistant aluminized steel, with stainless steel port protectors.

Port protectors prevent scale or foreign matter from obstructing the burner ports. Burners

individually removable for ease of inspection and servicing. Each burner is provided with an

individually adjustable, manually rotated air shutter adjustment.

Controls

A factory installed junction box is provided for all power connections. Standard units are provided

with a 24V combination single-stage redundant gas valve, consisting of a combination pilot

solenoid valve, automatic electric gas valve, pilot filter, pressure regulator, pilot adjustment and

manual shutoff. A flue vent fan relay and combustion air proving switch is also provided as

standard. Standard equipment includes spark-ignited intermittent pilot system with electronic

flame supervision. A 24V control transformer, high limit and fan time delay relay are provided. The

fan time delay relay delays the fan start until the heat exchanger reaches a predetermined

temperature. It also allows the fan to operate after burner shutdown, removing residual heat from

the heat exchanger.

Electronic Modulating 4–20 mA/0–10 Vdc Input

Provides modulated heat output. Ignition is at full fire (100 percent input), and modulates the gas

input from 100 percent to 40 percent rated input.

The modulating gas valve shall operate in response to a 4–20 mA or a 0–10 Vdc input from an

external DDC control.

Flue Vent Fan

Flue vent fan provides power venting. Provided factory assembled to a sealed flue collection

chamber. The flue vent fan is activated in response to a low voltage (24V) single-stage thermostat.

Note: The thermostat is not included with the gas control option.

A combustion air pressure switch is provided as standard to verify proper powered vent flow prior

to allowing the gas valve to operate.

Factory-Installed Options

Two-Stage Gas Valve

Provides two stages of heat. Ignition is at low fire (50 percent of the furnace’s rated input). Requires

the use of a two-stage thermostat.

Heat Exchanger Options

Type 409 Stainless Steel

Heat exchanger tubes and headers are seam welded 20-gauge Type 409 stainless steel.

UH-PRC002-EN 67

Mechanical Specifications

Type 321 Stainless Steel

Heat exchanger tubes and headers are seam welded 20-gauge Type 321 stainless steel.

Additional Options

Type 409 Stainless Steel Burners

Type 409 Stainless Steel Draft Diverter

Totally Enclosed Motor (Centrifugal fan units only)

Orifices for elevations over 2000 feet

Summer/Winter Switch

Vertical Louvers

Duct Discharge Flange

(Centrifugal fan units only) Provided in lieu of louvers on units for use with field ductwork.

Field-Installed Accessories

LP (Propane) to Natural Gas Conversion Package

High Gas Line Pressure Regulator (Natural gas units only) Reduces main gas line pressure to a

minimum of 7 inches wc (water column). Pressure at the jobsite must be specified. The regulator

is selected to accommodate that specific pressure.

Thermostats

Low voltage room thermostat, single-stage.

Low voltage room thermostat, single-stage with summer/winter switch.

Low voltage duct thermostat, single-stage.

Low voltage room thermostat, two-stage.

Low voltage duct thermostat, two-stage.

Universal tamperproof guard for all room thermostats.

Discharge Nozzles

Y Splitter

30° Downward

60° Downward

90° Downward

Concentric Vent Terminals

Vertical Concentric Vent Kit

Kit includes 5” cap with special attached non-recirculation disc, special 8” cap with 5” hole and

concentric vent box.

Horizontal Concentric Vent Kit

Kit includes 5” cap with special attached non-recirculation disc, inlet air screen and concentric vent

box.

Horizontal Blower Assembly (model HBAC)

General

Units are completely factory assembled, and have four-point suspension hangers and filter racks

as standard.

68 UH-PRC002-EN

Mechanical Specifications

Casing

Casings are 18-gauge galvanized steel with baked enamel finish. Side panels are removable for

easy servicing and motor maintenance. Duct flanges are provided for simple ductwork connection.

Standard filters are one-inch permanent washable type.

Motors

Factory-mounted motors are open drip-proof, 115, 230/60/1 or 208, 230, 460/60/3 with built-in

thermal overload protection.

Fans

Centrifugal fan is belt driven with adjustable pitch motor sheave. Fan is dynamically balanced for

quiet operation.

Factory-Installed Options

Insulation

Blower assembly and transition are insulated with fire-resistant, odorless, matte-faced one-inch

glass fiber material.

Floor Mounting Legs

Legs allow floor mounting of the blower assembly.

Totally Enclosed Motor

Field Installed Accessories

Optional Filters

(One-Inch Permanent Standard)

One-inch throwaway

One-inch permanent

Tr a n s i t i o n

When used with a duct furnace, a sheet metal transition is supplied to connect the blower assembly

to the duct furnace.

www.trane.com

For more information, contact your local Trane

office or e-mail us at comfort@trane.com

Literature Order Number UH-PRC002-EN

Date September 2009

Supersedes UH-PRC002-EN July 2009

Trane has a policy of continuous product and product data improvement and reserves the right to

change design and specifications without notice.