Lennox TUA60S, TUA100S, TUA45S, TUA125S, TUA75S User Manual

p

INSTALLATION
INSTRUCTIONS

Litho U.S.A.

2003

©

Lennox Industries Inc.
Dallas, Texas, USA

Table Of Contents

Unit Dimensions……………………………… 1, 2 Leak Check……………………………………….. 13
Shipping……………………………………… 3 Start-up Operation………………………………... 14
Requirements………………………………… 3 Heating Sequence of Operation………………… 16
Unit Heater Installation……………………… 4 Ignition Control LED……………………………… 16
Combustion & Ventilation

Air…………………
Venting………………………………………… 5 Service…………………………………………….. 19
Electrical Connections……………………… 12 Wiring Diagram………………….……………….. 20
Gas Connection……………………………… 13

4 Adjustments…………………….…………………. 17

TUA*S(N,L)(A,S)F

*045, 060, 075, 100, and 125

T-CLASSTM SEPARATED COMBUSTION
UNIT HEATERS

Do not store or use gasoline or
other flammable vapors and
liquids in the vicinity of this or any
other appliance.

Installation and service must be
performed by a qualified installer,
service agency or the gas supplier.

RETAIN THESE INSTRUCTIONS

FOR FUTURE REFERENCE

WARNING

If the information in this manual is not
followed exactly, a fire or explosion
may result causing property damage

ersonal injury or loss of life.

WHAT TO DO IF YOU SMELL GAS:

• Do not try to light any appliance.

• Extinguish any open flame.

• Do not touch any electrical switch; do not use any

phone in your building.

• Immediately call your gas supplier from a neighbor's
phone. Follow the gas supplier's instructions.

• If you cannot reach your gas supplier; call the fire
department.

,

P/N: 065354800 ORGINATED: 5/04 REVISED: 11/04 SUPERSEDES: NEW

Technical literature form number 504,955M

START-UP AND PERFORMANCE CHECK LIST

(

)

Job Name:___________________ Job No.:_______________________ Date:_________________________
Job Location:_________________ City:__________________________ State/Province:_________________
Installer:_____________________ City:__________________________ State/Province:_________________
Unit Model No.:_______________ Serial No.:_____________________ Service Technician:______________
Electrical Connections Tight?______________________ Flue Connections Tight?__________________________
Supply Voltage_________________________________ Unit Operation Checked?__________________________
Gas Piping Connections Tight & Leak Tested?________ THERMOSTAT
Motor Amps___________________________________ Calibrated?___________________________________
Unit BTU Input________________________________ Heat Anticipator Properly Set?___________________
Line Pressure__________________________________ Level?_______________________________________
Manifold Pressure___________________in. w. c.

45, 60, and 75 UNIT DIMENSIONS

MOUNTING SLOTS (Typical)

5/16 x 3 Inches (8 x 76 mm)

DIMENSION 45 60/75

A 12 (305) 17 (432)
B 5-1/2 (140) 6-1/2 (165)
C 7-3/4 (197) 10-1/4 (260
D 1-3/4 (44) 3-1/4 (83)
E5-1/4

133)5-3/4 (146

13

(330)

7-1/4
(184)

3-1/4

(83)

B

HANGING

BRACKETS

(2)

EXCHANGER

AIR

FLOW

HEAT

13

(330)

7

(178)

3

(76)

1/2

(13)

1

(25)

18-1/2

(470)

1

(25)

HANGING

BRACKETS (2)

ADJUSTABLE
LOUVERS

SITE
GLASS

18-1/2

(470)

SIDE VIEW

THUMB
SCREW

ELECTRICAL
BOX (60, 75)

GAS

INLET

FLUE

OUTLET

E

Page 1

5-3/4

(146)

D

ELECTRICAL
BOX (45)

(660)

C

COMBUSTION AIR
INLET

BACK VIEW

26

TOP VIEW

DIRECT

DRIVE FAN

1

(25)

A

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(13)

ADJUSTABLE

LOUVERS

32-3/8

(822)

THUMB
SCREW

SITE
GLASS

SIDE VIEW

100 and 125 UNIT DIMENSIONS

32-3/8

822

7-1/4
(184)

8-1/2

216

ELECTRIC
BOX

7 (178)

SERVICE

ACCESS

DOOR

GAS

INLET

THREADED STUDS

7-3/8

187

7-3/4

197

BACK VIEW

24-7/16

621

AIR

FLOW

HEAT

EXCHANGER

(ALUMINIZED

STEEL)

TOP VIEW

36-1/2
(927)

FLUE

OUTLET

COMBUSTION AIR INLET

DIRECT

DRIVE FAN

5-1/2

140

21-5/16

541

21
(533)

TABLE 1

UNIT CLEARANCES

Top Sides Access Panel Bottom Rear Single Wall Vent*

Model

TUA45S, TUA60S, TUA75S,

TUA100S, TUA125S

*Except for listed clearance thimbles

in mm in mm in mm in mm in mm in mm

1 25 1 25 18 457 0 0 18 457 6 152

1/2

Page 2

Shipping

The heater is completely assembled. Two mounting
brackets are included with the 45, 60, and 75 size units.
Check the unit for shipping damage. The receiving party
should contact the last carrier immediately if any shipping
damage is found.

Requirements – CSA in the USA

Installation of gas unit heaters must conform with local
building codes or, in the absence of local codes, with the
current National Fuel Gas Code ANSI Z223.1.
Installation in aircraft hangers must be in accordance with
the current Standard for Aircraft Hangers ANSI/NFPA No.

409.
Installation in parking structures must be in accordance
with the current Standard for Parking Structures
ANSI/NFPA No. 88A.
Installation in repair garages must be in accordance with
the current Standard for Repair Garages ANSI/NFPA No.
88B.
These units are approved for residential applications.
Residential applications are defined as installations for
heating non-living spaces that are attached to, adjacent
to or part of a structure that contains space for family
living quarters. For installation in a residential garage
these units must be installed so that burners and ignition
source are located no less than 18" (457mm) above floor.
Heater must be located or protected to avoid physical
damage by vehicles. Refer to the National Fuel Gas
Code, ANSI Z223.1, current edition.
Authorities having jurisdiction should be consulted before
installation.
The National Fuel Gas Code is available from:
American National Standard Institute Inc.
11 West 42nd Street
New York, NY 10036

These units are CSA International design certified. These
unit heaters are certified for installation clearances to
combustible material as listed in table 1 and on unit rating
plate. Accessibility and service clearances must be
observed in addition to fire protection clearances.
All electrical wiring and ground for unit must be in
accordance with the regulations of the current National
Electric Code ANSI/NFPA No. 70.
The National Electric Code is available from:
National Fire Protection Association
1 Batterymarch Park
PO Box 9101
Quincy, MA 02269-9101

Requirements – CSA in Canada

The instructions are intended only as a general guide and
do not supersede local codes in any way. Authorities
having jurisdiction should be consulted before installation.
The installation must conform with local building codes or
in the absence of local codes, with the current code CSA­B149.1 “Installation Code for Natural Gas Burning
Appliances and Equipment." All electrical wiring and
grounding for the unit must also comply with the
Canadian Electrical Code CSA C22.1, current edition.

These unit heaters are CSA International certified for the
clearances to combustible material listed on the rating
plate and table 1. Adequate clearance shall be provided
around the appliance and around air inlet terminals.
Provision shall be made for service accessibility to the
heater. Note that fire protection clearances may be
exceeded to provide additional space for service and
accessibility.

GARAGE INSTALLATIONS:

1- In a storage area, clearance from heaters to

combustible materials must be such that the material
shall not attain a temperature above 160°F by
continuous operation of the unit.

2- Eight foot minimum clearance from the floor to the

bottom of the heater must be maintained. Refer to the
CSA-B149 Codes.

AIRCRAFT HANGER:

1- In an area where aircraft are housed or serviced, 10'

minimum clearance from highest surface of aircraft to
bottom of the heater must be maintained.

2- In other areas, 8' minimum clearance from the floor to

bottom of heater must be maintained.

3- Heaters should be located so as to be protected from

damage from aircraft or other appliances needed for
servicing of aircraft. Refer to requirements of the
enforcing authorities.

RESIDENTIAL INSTALLATIONS:

These units are approved for residential applications.
Residential applications are defined as installations for
heating non-living spaces that are attached to, adjacent
to or part of a structure that contains space for family
living quarters. For installation in a residential garage,
these units must be installed so that burners and ignition
source are located no less than 18" (457mm) above floor.
Heater must be located or protected to avoid physical
damage by vehicles. Refer to CSA-B149.1, current
edition.
Be sure to check with local codes and ordinances for

additional requirements.

Page 3

.

Unit Heater Installation

INSTALL UNIT HEATER

MOUNTING BRACKETS
(45, 60, & 75 MODELS
ONLY)

SUPPORT

RODS

NORMAL POSITION (ABOVE) ALL MODELS

MOUNTING
BRACKETS (45, 60,
&75 MODELS ONLY)

SUPPORT

RODS

OPTIONAL INVERTED POSITION (ABOVE)

45, 60, AND 75 MODELS ONLY

FIGURE 1

45, 60, and 75 size units may be installed in the normal
position or inverted 180° as shown in figure 1 depending
on desired location as governed by clearances, vent
connection, air direction, gas supply, electrical supply
and service accessibility.

1- Rotate louvers directing airflow as desired.
2- Choose location for mounting brackets.
3- Remove the mounting brackets from their shipping

location (attached to the top of the unit) and replace
the screws that held the brackets in their shipping
location.

4- Remove and retain screws along top edge (bottom

edge when inverted) of front of unit.

5- Align screw holes on mounting bracket with holes

along top edge (either upright or inverted) of unit.

Secure mounting brackets to unit with retained
screws.

6- To support unit, secure mounting bracket to ceiling

joist or truss. Unit may also hang on rods as shown
in figure 1.

100 and 125 size units may not be inverted, 3/8” X 16
threaded inserts are provided in the top the cabinet.
Two threaded inserts are along one edge of the cabinet,
two inserts are in the panel that divides the heat
exchanger section from the control compartment.

1- Cut threaded rods to desired length and thread a

3/8” nut onto the rod.

2- Slide a flat washer onto the threaded rod AFTER

the nut (7/16” I.D. X 1” O.D. X 1/16” THK washer).

3- Screw the rods (four) into the threaded inserts on

the unit.

4- Tighten nuts to secure unit to rods.

Combustion and Ventilation Air

Adequate facilities for supplying air for combustion and
ventilation must be provided. All gas fired appliances
require air to be used for the combustion process. If
sufficient quantities of combustion air are not available,
the heater or another appliance will operate in an
inefficient manner, resulting in incomplete combustion
which can result in the production of excessive carbon
monoxide.

CAUTION - Insufficient combustion air can cause
headaches, nausea, dizziness, asphyxiation or death.

This unit must be provided with a combustion air pipe
that is connected to the outside atmosphere. Outdoor
air used for combustion must be free of the following
substances or the life of the heat exchanger will be
adversely affected: chlorine, carbon tetrachloride,
cleaning solvent, halogen refrigerants, acids, cements
and glues, printing inks, fluorides, paint removers,
varnishes, or any other corrosives.

TABLE 2

MAXIMUM HORIZONTAL VENT LENGTHS

Model 45, 60, 75 100, 125

No. of Elbows Ft (M) Ft (M)

1 25 (7.6) 25 (7.6)
2 20 (6.1) 20 (6.1)
3 15 (4.6) 15 (4.6)
4 10 (3.0) 10 (3.0)
5 5 (1.5) 5 (1.5)

Page 4

Venting and Combustion Air Inlet

A-General Recommendations and Requirements

NOTE - The vent is a passageway, vertical or nearly so,
used to convey flue gases from an appliance, or its vent
connector, to the outside atmosphere. The vent
connector is the pipe or duct that connects a fuel-gas
burning appliance to a vent or chimney. The combustion
air inlet is a pipe that connects the appliance to the
outside atmosphere to convey oxygen from the air to
the appliance burner.

Unit heaters must be vented in compliance with all local
codes or requirements of the local utility, the current
standards of the (American) National Fuel Gas Code,
ANSI Z223.1 or (Canada) CSA-B149 Installation Codes,
and the following instructions.

A vent connection flange and a combustion air pipe
connection flange are attached to the back of the unit.
Single wall vent material shall have all seams and joints
sealed with pressure sensitive aluminum tape or
silicone rubber sealant. Aluminum tape must meet the
provisions of SMACNA AFTS-100-73 Standards. The
aluminum tape has a temperature rating of 400°F
(204°C). Silicone rubber sealant must have a
temperature rating of 482°F (250°C), i.e., Dow Corning
RTV-736 or equivalent. All joints shall be secured with
at least two corrosion resistant screws. All joints must
be checked for gas tightness after installation.
Single wall vent shall not pass through any attic, interior
wall, concealed space, or floor.

B-Vertical Vents Using Metal Vent Pipe- Commercial
and Residential Installations

These separated combustion unit heaters are listed as
Category I appliances for vertical vent installations.
1-These unit heaters are to be vented with NFPA- or

ANSI- approved chimneys, U.L. listed type B-1 gas
vents, single wall metal pipe, or listed chimney lining
system for gas venting where applicable, as well as
the modifications and limitations listed in figure 2.
Seal single wall vent material according to the
section A-General Recommendations and
Requirements. Air inlet pipe may be single wall
metal pipe or U.L. listed single wall metal flex
connector. A concentric vent/adapter/cap kit as
specified in these instructions may be used for
vertical termination. Refer to table 3.

2- The vent connector shall be 3" (76mm) diameter on

45 units, 4" (100mm) diameter on 60/75 units, and
5” (127mm) on 100/125 units. The air inlet pipe shall

be 3” (76mm) diameter on 45 units and 4” (100mm)
diameter on 60/75/100/125 units.

3- Keep the vent and air inlet runs as short as possible

with a minimum number of elbows. Refer to the
(American) National Fuel Gas Code ANSI Z223.1 or
(Canada) CSA-B149 Installation Code for maximum
vent and vent connector lengths. Horizontal run of
the vent connector from the induced draft blower to
the chimney/vent cannot exceed the values in table

2. Single wall vent connector shall not be insulated.

4- If a single wall vent is used in an unheated area it

shall be insulated with a minimum of 1/2" thick foil
faced fiberglass 1-1/2# density insulation. Failure to
do so will result in condensation of flue gases.

5- The unit may be vented vertically as a single

appliance or as a common vent with other gas-fired
appliances. In common venting situations, vent
connectors for other appliances must maintain a 4"
(100mm) vertical separation between the vent
connectors. Refer to common venting tables in the
(American) National Fuel Gas Code ANSI Z223.1 or
(Canada) CSA-B149 Installation Code for proper
vent size.

6- Clearance to combustible material is 6" (152mm) for

single wall vent material except where a listed
clearance thimble is used. Clearance to combustible
material for type B-1 vent or factory-built chimney is
per manufacturer’s instructions. Clearance to
combustible material is 1” on vertical sections of the
concentric vent/adapter/cap kit.

7- The vent connector shall be supported without any

dips or sags. Vertical vents shall be supported in
accordance with their listing and manufacturers’
instructions. All horizontal vent connector runs shall
have a slope up to the vertical vent of at least 1/4"
per foot (1mm per 50mm).

8- All vertical type B-1 vents, single wall vents, or listed

chimney lining system must be terminated with a
listed vent cap or listed roof assembly.

9- The vent must extend at least 3' (1m) above the

highest point where it passes through a roof of a
building and at least 2’ (0.6m) higher than any part
of a building within a horizontal distance of 10'
(3.05m) unless otherwise specified by the
(American) National Fuel Gas Code, ANSI Z223.1
or (Canada) CSA-B149 Installation Codes. The vent
must extend at least 5' (1.6m) above the highest
connected equipment flue collar.

Page 5

VENT AND AIR INTAKE TERMINATION ON SINGLE WALL VENT

SINGLE WALL TERMINATION

DOUBLE WALL (TYPE B-1) TERMINATION

ROOF FLASHING

ROOF PITCHED
FROM 0" TO 45"

SHALL NOT BE A
CONCEALED SPACE

2" CLEARANCE

THIMBLE

FIGURE 2

C-Horizontal Venting - General

Common venting is not allowed with horizontal vent.
The minimum horizontal vent length is three feet (914mm).
1- If possible, do not terminate the horizontal vent

through a wall that is exposed to prevailing wind.
Exposure to excessive winds can affect unit
performance. If such a termination is necessary, use a
wind block to protect the vent termination from direct
winds.

2- Vent termination must be free from obstructions and at

least 12" (306mm) above grade level and maximum
snow height.

3- Do not terminate vent directly below roof eaves or

above a walkway, or any other area where condensate
dripping may be troublesome and may cause some
staining. Avoid windows where steam may cause
fogging or ice buildup.

4- When horizontally vented, minimum clearance for

termination from any door, window, gravity air inlet,
gas or electric meter, regulators, and relief equipment
is 4 ft. (1.2m) for U.S. installations. Refer to NFPA
54/ANSI Z223.1 in the U.S.A. and CSA B149.1 and .2
in Canada or with authorities having local jurisdiction.
In Canada, vent termination must have a minimum 6
ft. (1.8mm) horizontal clearance from gas and electric
meters and relief devices as specified in the Canadian
B149.1, Natural Gas Installation Code.

5- Vent termination must be a minimum of 4' (1.2m)

below or 4’ (1.2m) horizontally from any soffit vent or
under-eave vent.

6- Vent must be a minimum of 6' from an inside corner

formed by two exterior walls. If possible, leave a 10'
clearance.

7- Vent termination must be a minimum of 10' (3m) from

any forced air inlet (includes fresh air inlet for other
appliances, such as a dryer).

8- When termination is routed through an exterior

combustible wall the vent must be supported using a
listed clearance thimble. Where local authorities
permit, a single section of type B-1 vent pipe may be

Page 6

ROOF FLASHING

ROOF PITCHED
FROM 0" TO 45"

12" MAX

SEAL JOINT BETWEEN SINGLE WA LL V EN T A N D “B"
VENT AND THE ANNULAR SPACE OF T H E “B" VENT.

CLEARANCE TO BE

AS SPECIFIED ON

TYPE “B" VENT PIPE.

used as an alternative to the thimble. When using a
type B-1 vent termination use the clearances specified
by the vent manufacturer. Seal the connection
between the single wall and double wall pipes and the
annular space of the double wall pipe as shown in
figure 2. Inside edge of vent termination tee or
Belmont cap must be at least 12 inches from outside
wall as shown in figure 3.

9- All horizontal vents must terminate with a tee or with a

cap as specified in table 4. Opening end of tee used
for termination must face downward. Addition of ¼”
(6mm) mesh corrosion resistant material as a bird
screen in the tee or cap openings may be used.

9- For horizontal venting, the vent pipe shall be

supported with hangers no more than 3ft. (1m) apart
to prevent movement after installation.

10- Clearance to combustible material is 6" (152mm) for

single wall vent material except where a listed
clearance thimble is used. Clearance to combustible
material for type B-1 vent or factory-built chimney is
per manufacturer’s instructions. Clearance to
combustible material is 1” at the sides, 1” below, and
3” above on horizontal installations of the concentric
vent/adapter/cap kit

D-Horizontal Venting-Commercial

1- Horizontal commercial installations are for buildings

that are not attached to living spaces. The vent may
be single wall vent material installed according to
the sections Venting A-General

Recommendations and Requirements and C-
Horizontal Venting - General and D-Horizontal
Venting - Commercial. Refer to figures 3, 4, and 5.

The air inlet may be single wall vent material or U.L.
listed single wall flex connector.

2- Refer to table 2 for maximum vent lengths. The vent

pipe diameter for horizontal commercial installations
shall be 3” (76mm) on 45 units, 4” (100mm) on
60/75 units, 5” (127mm)on 100/125 units.