TRANE Furnace/Heater, Gas Manual L0905285

User Manual: TRANE TRANE Furnace/Heater, Gas Manual TRANE Furnace/Heater, Gas Owner's Manual, TRANE Furnace/Heater, Gas installation guides

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1 8- CD2 1 D1 - 4

High Efficiency Single Stage Upflow/Horizontal
and Downflow/Horizontal Gas-Fired Furnaces,
"Fan Assisted Combustion System"
*UDIA040A9H21
*UDIB060A9H31
*UDIB080A9H31
*UDIC080A9H41

B
B
B
B

*UD1 B100A9H31 B
*UDIC100A9H51
B
*UD1 D120A9H51 B
*UD1D140A9H51B

*DD1
*DD1
*DD1
*DD1

B060A9H31B
B080A9H31B
C100A9H51B
D120A9H51B

*__First letter may be "A" or 'q-"
ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES
IMPORTANT -- This Document is customer property and is to remain with this unit.
Please return to service information pack upon completion of work.

For VENT SIZING INFORMATION see:
USA -National Fuel Gas Code ............. ANSI Z223.1/NFPA 54 (latest version)
CANADA -Natural Gas Installation Code ........... CAN/CGA-B149.1
Propane Installation Code ................. CAN/CGA-B149.2
USA/CANADA

ALTERNATE

Category I Venting Guide ..................................

(latest version)
(latest version)

Pub. No. 18-CH23D1-2

Upflow/Horizontal*

Downflow/Horizontal*

*Horizontal Conversion for these furnaces may be left or right side rotation.

A341789P07

Installer's

Guide

SAFETY

SECTION

The following safety practices and precautions
must be
followed during the installation,
servicing, and operation of this furnace.
1. Use only with the type of gas approved for this furnace. Refer to the furnace rating plate.
2. Install this furnace only in a location and position as
specified in "Location and Clearances"
(page 4), of
these instructions.
3. Provide adequate combustion and ventilation air to
the furnace space as specified in "Air for Combustion and Ventilation"
(pages 8-9), of these instructions.
4. Combustion products must be discharged outdoors.
Connect this furnace to an approved vent system
only, as specified in the "Venting" section (pages 1315), of these instructions.
5. Never test for gas leaks with an open flame. Use a
commercially available soap solution made specifically for the detection of leaks to check all connections, as specified in "Gas Piping" (page 618), of
these instructions.
6. Always install the furnace to operate within the
furnace's intended temperature-rise
range with a
duct system which has an external static pressure
within the allowable range, as specified on the unit
rating plate. Airflow with temperature
rise for cfm
versus static is shown in the Service Facts accompanying this furnace.
7. When a furnace is installed so that supply ducts
carry air circulated by the furnace to areas outside
the space containing
the furnace, the return air
shall also be handled by a duct(s) sealed to the furnace casing and terminating
outside the space containing the furnace.
8. A gas-fired furnace for installation
in a residential
garage must be installed as specified in "Location
and Clearances"
section (page 4), of these instructions.
9. The furnace may be used for temporary heating of
buildings
or structures
under
construction
only
when the following conditions have been met:
a. The furnace venting system must be complete
and installed per manufacturer's
instructions.
b. The furnace is controlled only by a room thermostat (no field jumpers).
c. The furnace return air duct must be complete and
sealed to the furnace and clean air filters are in
place.
d. The furnace input rate and temperature
rise
must be verified to be within nameplate
marking.
e. 100% of the furnace combustion air requirement
must come from outside the structure.

CARBON MONOXIDE

POISONING HAZARD

Failure to follow the steps outlined below for each
appliance
connected to the venting system being
placed into operation could result in carbon monoxide
poisoning or death.
The following steps shall be followed for each appliance
connected
to the venting
system being placed into
operation, while all other appliances connected to the
venting system are not in operation:
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and horizontal
pitch, as required in the National Fuel Gas Code,
ANSIZ223.1/NFPA
54 or the
CAN/CGA
B149
Installation Codes and these instructions.
Determine
that there is no blockage or restriction,
leakage,
corrosion and other deficiencies which could cause an
unsafe condition.
3.

As far as practical, close all building doors and windows
and all doors between
the space in which the
appliance(s)
connected
to the venting system are
located and other deficiencies which could cause an
unsafe condition.

Close fireplace dampers.

5. Turn on clothes dryers and any appliance not connected
to the venting system. Turn on any exhaust fans, such
as range hoods and bathroom exhausts, so they are
operating at maximum speed. Do not operate a summer
exhaust fan.
6.

Follow the lighting instructions. Place the appliance being inspected into operation. Adjust the thermostat so
appliance is operating continuously.

If improper venting is observed during any of the above
tests, the venting
system
must be corrected
in
accordance
with the National
Fuel Gas Code,
ANSI Z221.1/NFPA
54
and/or
CAN/CGA
B149
Installation Codes.

After it has been determined that each appliance
connected to the venting system properly vents where
tested as outlined above, return doors, windows, exhaust
fans, fireplace dampers and any other gas-fired burning
appliance to their previous conditions of use.

£ The furnace return air temperature
range is between 55 and 80 degrees Fahrenheit.
g. Clean the furnace, duct work, and components
upon substantial
completion of the construction
process, and verify furnace operating conditions
including ignition, input rate, temperature
rise
and venting, according to the manufacturer's
instructions.
This

product

must

be gas

10. Massachusetts.Plumber
or Gas Fitter

piped

in the

by a Licensed

Commonwealth

1 8-CD21

D1-4

Installer's
Safety signal words are used to designate a degree or
level of seriousness associated with a particular hazard.
The signal words for safety markings
are WARNING,
and CAUTION.
a. WARNING indicates a potentially hazardous
situation which, if not avoided, could result in death or
serious injury.
b. CAUTION indicates a potentially hazardous situation
which, if not avoided, may result in minor or moderate injury. It is also used to alert against unsafe
practices and hazards involving only property damage.

FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could result in serious injury, death or property damage.
Improper servicing could result in dangerous operation, serious injury, death, or property damage.

Guide

Contents
Installation

Instructions

General Installation Instructions
Location and Clearances
Outline Drawing
Upflow Installation
Downflow Installation
Air For Combustion and Ventilation
Duct Connections
Return Air Filters
Typical Upflow Return Air Filter Installations
Alternate Upflow Filter Clip / Bracket Installation
Typical Downflow Furnace Return Air Filter Installations
General Venting Instructions
Venting Into a Masonry Chimney
Electrical Connections
Field Wiring Diagrams
Gas Piping
Sequence of Operation

Start Up and Adjustment
Preliminary Inspections
Combustion and Input Check
High Altitude Derate
Lighting Instructions
Control and Safety Switch Adjustment

IFC Error Flash Codes
Abnormal

Conditions

To prevent shortening its service life, the furnace
should not be used as a "Construction Heater" during
the finishing phases of construction until the requirements listed in item 9, a-g of the safety section of this
publication have been met. Condensate in the presence of chlorides and fluorides from paint, varnish,
stains, adhesives, cleaning compounds, and cement
create a corrosive condition which may cause rapid deterioration of the heat exchanger.

These furnaces are not approved or intended for installation in manufactured (mobile) housing, trailers, or
recreational vehicles.
Failure to follow this warning could result in property
damage, personal injury, or death.

Do NOT install the furnace in a corrosive or contaminated atmosphere.

18-CD21 D1-4

Installer's
GENERAL

Guide

INSTALLATION

INSTRUCTIONS

The manufacturer
assumes no responsibility
for equipment installed in violation of any code or regulation.
It is recommended
that Manual J of the Air Conditioning Contractors Association (ACCA) or A.R.I. 230 be followed in estimating heating requirements.
When estimating heating
requirements
for installation
at Altitudes above 2000 ft., remember the gas input must be
reduced (See GAS INPUT ADJUSTMENT).
Material
in this shipment
has been inspected
at
the factory
and released
to the transportation
agency
without
known
damage.
Inspect
exterior
of carton
for evidence
of rough handling
in shipment. Unpack
carefully
after moving
equipment
to approximate
location.
If damage
to contents
is
found, report
the damage
immediately
to the delivering agency.
Codes and local utility requirements
governing the
installation of gas fired equipment, wiring, plumbing,
and flue connections must be adhered to. In the absence of local codes, the installation
must conform with
latest edition of the National Fuel Gas Code ANSI
Z223.1 • National Installation Code, CAN/CGA B149.1.
The latest code may be obtained from the American Gas
Association Laboratories, 400 N. Capitol St. NW,
Washington D.C. 20001.
1-800-699-9277 or www.aga.org
These furnaces have been classified as Fan Assisted
Combustion system CATEGORY I furnaces as required
by ANSI Z21.47 "latest edition" and CAN/CGA 2.3.
Therefore they do not require any special provisions for
venting other than what is indicated in these instructions. (Category I defined on page 14).
These furnaces
may be twinned.
They shall have
common
returns
with equal pressure
drops or
ducts with equivalent
lengths and sizes. See Field
Wiring Diagrams
for Twinning
on page 17 for
proper hookup.

LOCATION AND CLEARANCES
The location of the furnace is normally selected by the
architect, the builder, or the installer.
However, before
the furnace is moved into place, be sure to consider the
following requirements:
1. Is the location selected as near the chimney or vent
and as centralized for heat distribution as practical?
2. Do all clearances
between the furnace and enclo-

sure equal or exceed the minimums stated in Clearance Table on the Outline Drawings.
Is there sufficient space for servicing the furnace
and other equipment?
A minimum
of 24 inches
front accessibility to the furnace must be provided.
Any access door or panel must permit removal of
the largest component.
Are there at least 3 inches of clearance between the
furnace combustion air openings in the front panel
and any dosed panel or door provided?
Are the ventilation
and combustion
air openings
large enough and will they remain unobstructed?
If
outside air is used, are the openings set above the
highest snow accumulation
level? (See the Air for
Combustion and Ventilation section.)
Allow sufficient height in supply plenum above the
furnace to provide for cooling coil installation,
if the
cooling coil is not installed at the time of this furnace
installation.

7. A furnace shall be installed so electrical components
are protected from water.
8. If the furnace is installed in a residential
garage,
it must be installed so that the burners, and the ignition source are located not less than 18 inches
above the floor and the furnace must be located or
protected to avoid physical damage from vehicles.

18-CD21 D1-4

Installer's

Guide
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Installer's

Guide
GAS PIPING

FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could result in serious injury, death or property damage. Never
test for gas leaks with an open flame. Use a commercially available soap solution made specifically for the
detection of leaks to check all connections. A fire or explosion may result causing property damage, personal
injury, or loss of life.

LEFT SIDE PIPING (STANDARD)
MANUAL MAIN
SHUTOFF

This unit is shipped standard for left side installation of
gas piping. A piping knockout is also provided in the
right side for an alternate piping arrangement.
The installation of piping shall be in accordance with piping
codes and the regulations of the local gas company. Pipe
joint compound must be resistant to the chemical reaction with liquefied petroleum gases.
Refer to piping Table 9 for delivery sizes. Connect gas
supply to the unit, using a ground joint union and a
manual shut-off valve as shown in Figure 19. National
codes require a condensation
drip leg to be installed
ahead of the controls as shown in Figure 19.
The furnace and its individual shut-off valve must be disconnected from the gas supply piping system during any
pressure testing of that system at test pressures in excess of 1/2 psig.
The furnace must be isolated from the gas supply piping
by closing its individual manual shut-off valve during
any pressure testing of the gas supply piping system at
test pressures equal to or less than 1/2 psig.

UNION JOINT

DRIP LEG

AUTOMATIC GAS VALVE
WITH MANUAL SHUTOFF

Use a backup wrench on the gas valve when installing
gas piping to prevent damage to the gas valve and
manifold assembly.

RIGHT SIDE PIPING (OPTIONAL)

SHUTOFF VALVE

NOTF"
Maximum pressure to the gas valve for natural gas is
13.8" W.C. Minimum pressure is 5.0" W.C. Maximum
pressure to the gas valve for propane is 13.8" W.C.
Minimum pressure is 11.0" W.C.

UNION JOINT

All gas fittings must be checked for leaks using a soapy
solution before lighting the furnace.
DO NOT CHECK WITH AN OPEN FLAME!
The following

warning

complies

with State of California

law, Proposition

65.

AUTOMATIC GAS VALVE
WiTH MANUAL _UTOFF

Hazardous Gases!
TOP VIEW OF RIGHT SIDE PIPING

Exposure to fuel substances or by-products of
incomplete fuel combustion is believed by the state of
California to cause cancer, birth defects, or other
reproductive harm.
SEQUENCE OF OPERATION
THERMOSTAT CALL FOR HEAT
R and W thermostat
contacts
module to run its self-check

TOP VIEW

close signaling the control
routine. After the control

module has verified that the pressure switch contacts
are open and the limit switch(es) contacts are closed,
the draft blower will be energized.

TO PREVENT AN EXPLOSION OR POSSIBLE INJURY,
DEATH AND EQUIPMENT DAMAGE, DO NOT STORE
COMBUSTIBLE MATERIALS, GASOLINE OR OTHER
FLAMMABLE VAPORS OR LIQUIDS NEAR THE UNIT.

18-CD21 D1-4

Installer's
As the induced draft blower comes up to speed, the
pressure switch contacts will close and the ignitor warm
up period will begin. The ignitor will heat for approx. 20
seconds, then the gas valve is energized to permit gas
flow to the burners. The flame sensor confirms that ignition has been achieved within the 6 second ignition
trial period.
After the flame sensor confirms that ignition has been
achieved, the delay fan ON period (fixed at 45 seconds)
begins timing. After the delay of 45 seconds, the indoor
blower motor will be energized and will continue to run
during the heating cycle.
When the thermostat
is satisfied, R and W thermostat
contacts open, the gas valve will close, the flames will
extinguish, and the induced draft blower will be de-energized. The indoor blower motor will continue to run
for the fan off period (fixed at 100 seconds), then will be
de-energized by the control module.

test for gas leaks with an open flame. Use a commercially available soap solution made specifically for the
detection of leaks to check all connections. A fire or explosion may result causing property damage, personal
injury, or loss of life.

START-UP

AND ADJUSTMENT

PRELIMINARY INSPECTIONS
With gas and electrical
power "OFF"
1. Duct connections are properly sealed
2. Filters are in place
3. Venting is properly assembled
4. Blower door is in place
Turn knob on main gas valve within the unit to the
"OFF" position. Turn the external gas valve to "ON".
Purge the air from the gas lines. After purging, check
all gas connections for leaks with a soapy solution - DO
NOT CHECK WITH AN OPEN FLAME. Allow 5 minutes for any gas that might have escaped to dissipate.
LP Gas, being heavier than air, may require forced ventilation.
Turn the knob on the gas valve in the unit to
the "ON" position.
COMBUSTION AND INPUT CHECK
1. Make sure all gas appliances are off except the furnace.
2. Clock the gas meter with the furnace operating (determine the dial rating of the meter) for one revolution.
3. Match the "Sec" column in the gas flow (in cfh)
Table 12 with the time clocked.
4. Read the "Flow" column opposite
onds clocked.

18-CD21 D1-4

the number

Guide

5. Use the following factors if necessary:
For 1 Cu. Ft. Dial Gas Flow CFH =
Chart Flow Reading
For 1/2 Cu. Ft. Dial Gas Flow CFH =

Chart Flow Reading + 4
For 5 Cu. Ft. Dial Gas Flow CFH =
10X Chart Flow Reading + 4
6. Multiply the final figure by the heating value of the
gas obtained from the utility company and compare
to the nameplate
rating. This must not exceed the
nameplate rating.
7.Changes
can be made by adjusting
the manifold
pressure or changing orifices (orifice change may
not always be required).
To adjust the manifold
pressure:
a.Turn off all electrical power to the system.
b.Attach a manifold pressure gauge to the outlet pressure tap marked
"OUT PRESS TAP" on WhiteRodgers gas valve model 36F or boss marked "OUT
P" on White-Rodgers
gas valve model 36G. (See Figure 21) for White-Rodgers
gas valve model 36F and
Figure 20 for White-Rodgers
gas valve model 36G).
For the gas valve model 36F, measurement
requires removal of the plug and installation
of a
barbed fitting. Attach flexible tubing and a manometer to the barbed fitting.
For the gas valve model 36G, do not remove the
pressure tap test screw. Using a 3/32" hex wrench,
loosen the pressure tap test screw one turn and install 5/16" flexible tubing and a manometer
directly
onto the outlet pressure boss.
c. Turn on system power and energize valve.
d.Remove the regulator adjustment
screw cap on the
gas valve for manifold pressure adjustment.
e.Turn the adjustment
nut clockwise to increase the
gas flow rate, and counterclockwise
to decrease the
gas flow rate using a 3/32" hex wench.
f. The final manifold pressure
setting shall be 3.5"
W.C. with an input of no more than nameplate rating and no less than 93% of the nameplate
rating,
unless the unit is derated for high altitude.
g.Replace the regulator
adjustment
screw cap and
tighten securely.
h.Turn off all electrical power to the system.
i. Remove the manometer
and flexible tubing. Remove the barbed fitting and replace the plug or
tighten the pressure test screw.
j. Turn on electrical power to the system and energize
valve.
k. Using a leak detection solution or soap suds, check
for leaks at plug or pressure boss screw.

of sec-

Installer's

Guide
HIGH ALTITUDE DEBATE

Replace and/or tighten all plugs removed or loosened
when adjusting gas pressure. Leak check the fittings
before placing the furnace into regular service.
Failure to follow this warning could result in fire, explosion, or property damage.
For LP gases, the final manifold pressure setting shall
be 10.5" W.C. with an input of no more than the nameplate rating and no less than 93% of the nameplate rating, unless the unit is derated for altitude.
Table 10 lists the main burner orifices shipped with the
furnace.
If a change of orifices is required to correct the
input rate, refer to Table 11.
TABLE 9
NATURAL GAS ONLY
TABLE OF CUBIC FEET PER HOUR OF GAS
FOR VARIOUS PIPE SIZES AND LENGTHS
PIPE

LENGTH OF PIPE

SIZE

132

278

190

152

130

115

105

520

350

285

245

215

195

180

1-1_

1050

730

590

520

440

400

370

Input ratings (BTUH) of these furnaces are based on
sea level operation and should not be changed at elevations up to 2,000 ft.
If the installation
is 2,000 ft. or above, the furnace input
rate (BTUH) shall be reduced 4% for each 1,000 ft.
above sea level. The furnace input rate shall be checked
by clocking the gas flow rate (CFH) and multiplying by
the heating value obtained from the local utility supplier for the gas being delivered at the installed altitude.
Input rate changes can be made by adjusting the manifold pressure (min 3.0 - max 3.7 in. W.C. - Natural Gas)
or changing orifices (orifice change may not always be
required). If the desired input rate cannot be achieved
with a change in manifold pressure, then the orifices
must be changed. LP installations
will require an orifice
change.
Installation
of this furnace at altitudes above 2,000 ft.
(610m) shall be in accordance with local codes, the National Fuel Gas Code, ANSI Z223.1/ NFPA 54 or National Standard
of Canada, Natural Gas and Propane
Installation
Code, CSA B149.1. Installation
of this furnace at altitudes above 2,000 ft. (610m) shall be made in
accordance with the listed high Altitude Conversion Kit
available with this furnace.

This table is based on pressure drop of 0.3 inch W.C. and 0.6 SEGR. gas

IMPORTANT:
Re-install the propane orifices to the same depth as the
orifices supplied with the equipment.

TABLE 10
ORIFICE SIZES
INPUT
RATING
BTUH

NUMBER
OF
BURNERS

40,000
60,000

2
3

80,000
100,000
120,000

4
5
6

140,000

PART NUMBERS

MAIN BURNER ORIFICE
DRILL SIZE
NAT. GAS

LP GAS

45
45
45

56
56
56

45
45

56
56

TABLE 11
FOR REPLACEMENT

See Table 13 for help in selecting orifices if orifice
change is required. Furnace input rate and temperature rise should be checked again after changing oririces to confirm the proper rate for the altitude.
Installations
above 4,000 feet may require a pressure
switch change.
If required, use the BAYHALT*** Kit
(High Altitude Accessory Kit) listed in PRODUCT DATA.

ORIFICES

DRILL
SIZE

PART
NUMBER

DRILL
SIZE

PART
NUMBER

44
45
46
47
48

ORFO0501
0RF00644
ORFO0909
ORFO0910
0RF01099

54
55
56
57
58

49
50

ORFO0503
0RF00493

0RF00555
0RF00693
ORFO0907
ORFO0908
0RF01338
0RF01339

EXPLOSION HAZARD!
PROPANE GAS IS HEAVIER THAN AIR AND MAY
COLLECT IN ANY LOW AREAS OR CONFINED
SPACES. IN ADDITION, ODORANT FADE MAY MAKE
THE GAS UNDETECTABLE EXCEPT WITH A WARNING DEVICE. IF THE GAS FURNACE IS INSTALLED
IN A BASEMENT, AN EXCAVATED AREA OR A
CONFINED SPACE, IT IS STRONGLY RECOMMENDED TO CONTACT A GAS SUPPLIER TO INSTALL A GAS DETECTING WARNING DEVICE IN
CASE OF A GAS LEAK.
NOTE: The manufacturer of your furnace does NOT test
any detectors and makes no representations regarding
any brand or type of detector.

18-CD21 D1-4

Installer's
TABLE 12

TABLE 13

GAS FLOW IN CUBIC FEET PER HOUR
SEC.
8
9
10
11

FLOW
900
800
720
655

12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28

600
555
514
480
450
424
400
379
360
343
327
313
300
288
277
267
257

2 CUBIC FOOT DIAL
SEC. FLOW SEC. FLOW
29
248
50
144
30
240
51
141
31
232
52
138
32
225
53
136
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49

218
212
206
200
195
189
185
180
176
172
167
164
160
157
153
150
147

54
55
56
57
58
59
60
62
64
66
68
70
72
74
76
78
80

133
131
129
126
124
122
120
116
112
109
106
103
100
97
95
92
90

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(_
Outlet Pressure Boss
!!!!!i_i!i_i!i_i!i_i!i_i!i_i!i_i!i_i!i_i!i_i!i_i!i_i!i_i!i_i!i_i!i_i!i_i!i_i!!_

Inlet Pressure
Boss (opt.)

On/Off Switch
White-Rod_ers

3613

Guide

gas

valve

On/Off Switch

SEC.
82
84
86
88

FLOW
88
86
84
82

90
92
94
96
98
100
104
108
112
116
120
124
128
132
136
140
144

80
78
76
75
73
72
69
67
64
62
60
58
56
54
53
51
50

Orifice
Twist Drill
Size If
Installed
At Sea
Level

ALTITUDE ABOVE SEA LEVEL
and Orifice Required At Other Elevations

2000 3000 4000 5000 6006

10000

43
44
45
46

44
45
46
47

44
45
47
47

45
46
47
48

45
47
48
48

46
47
48
49

47
48
49
49

47
48
49
50

48
50
50
51

54
55

55
55

55
56

56
56

56
57

56
57
58

56
58
59

56
59
60

57
59
60

57
60
61

57
60
62

58
61
62

59
62
63

59
63
63

60
63
64

From National Fuel Gas Code - Table F-4
LIGHTING

INSTRUCTIONS

DO NOT attempt to manually light the burner.
Failure to follow this warning could result in property
damage, personal injury or death.
Lighting
instructions
appear
installation
must be checked

Regulator

7000 8000 9000

on each unit.
Each
out at the time of

initial start up to insure proper operation
of all
components.
Check out should include
putting
the unit through
one complete
cycle as outlined
below.
Turn on the main electrical supply and set the thermostat above the indicated temperature.
The ignitor will
automatically
heat, then the gas valve is energized to
permit the flow of gas to the burners. After ignition and
flame is established,
the flame control module monitors
the flame and supplies power to the gas valve until the
thermostat
is satisfied.
TO SHUT OFF
For complete shutdown: Move the control switch on the
main gas valve to the "OFF" position (See Figures 20
and 21). Disconnect the electrical supply to the unit.

If this is done during the cold weather months, provisions must be taken to prevent freeze-up of all water
pipes and water receptacles.
Failure to follow this warning could result in property
damage.

White-Rodgers

18-CD21 D1-4

36F gas valve

Whenever
your house
have someone
inspect
perature.
This is very
ing weather.
If for
should fail to operate
as frozen water pipes.

is to be vacant, arrange to
your house for proper temimportant
in below freezany reason
your furnace
damage could result, such

Installer's

Guide

CONTROL AND SAFETY
ADJUSTMENT

SWITCH

LIMIT SWITCH CHECK OUT
The limit switch is a safety device designed to close the
gas valve should the furnace become overheated. Since
proper operation
of this switch is important
to the
safety of the unit, it must be checked
out on initial
start up by the installer.
To check for proper operation of the limit switches, set
the thermostat
to a temperature
higher than the indicated temperature
to bring on the gas valve. Restrict
the airflow by blocking the return air or by disconnecting the blower. When the furnace reaches the maximum outlet temperature
as shown on the rating plate,
the burners must shut off. If they do not shut off after a
reasonable
time and overheating
is evident, a faulty
limit switch is probable and the limit switch must be replaced. After checking the operation of the limit control,
be sure to remove the paper or cardboard from the return air inlet, or reconnect the blower.
AIRFLOW ADJUSTMENT
Check inlet and outlet air temperatures
to make sure
they are within the ranges specified on the furnace rating nameplate.
If the airflow needs to be increased or
decreased, see the wiring diagram for information
on
changing the speed of the blower motor.

INSTRUCTIONS TO THE OWNERS
In the event
that electrical,
fuel, or mechanical
failures
occur,
the owner
should
immediately
turn the gas supply
off at the manual
gas valve,
located
in the burner
compartment
(See Figure
19). Also turn off electrical
power to the furnace
and contact
the service
agency
designated
by
your dealer.

Should overheating occur, or the gas supply fail to
shut off, shut off the gas valve to the unit before shutting off the electrical supply.
Failure to follow this warning could result in property
damage, personal injury or death.
The following

warning

complies

with State of California

This unit is equipped with a blower door switch which
cuts power to the blower and gas valve causing shutdown when the door is removed. Operation
with the
door removed or ajar can permit the escape of dangerous fumes.
All panels must be securely closed at all
times for safe operation of the furnace.
NOTE:
Direct drive motors have bearings which are permanently lubricated and under normal use, lubrication is
not recommended.
INDOOR BLOWER TIMING
The control module controls the indoor blower. The
blower starts approximately
45 seconds after ignition.
The FAN-OFF
period is approximately
100 seconds
from the interruption
of gas flow.
ROOM AIR THERMOSTAT HEAT ANTICIPATOR
ADJUSTMENT

65.

This product contains fiberglass wool insulation!
Fiberglass dust and ceramic fibers are believed by the
State of California to cause cancer through inhalation.
Glasswool fibers may also cause respiratory, skin, or
eye irritation.

PRECAUTIONARY MEASURES
• Avoid breathing

fiberglass

• Use a NIOSH approved

Disconnect power to the unit before removing the
blower door.
Failure to follow this warning could result in property
damage, personal injury or death.

law, Proposition

• Avoid contact with
sleeved,
loose-fitting
protection.

dust.

dust/mist

respirator.

the skin or eyes. Wear longclothing,
gloves,
and
eye

• Wash clothes separately
washer thoroughly.

from

other

clothing:

rinse

• Operations
such as sawing, blowing, tear-out, and
spraying may generate fiber concentrations
requiring
additional
respiratory
protection.
Use the appropriate
NIOSH approved respirator in these situations.
FIRST AID MEASURES
Eye Contact - Flush eyes with water to remove
symptoms persist, seek medical attention.
Skin Contact
- Wash affected
and warm water after handling.

OPERATING

dust. If

areas gently with soap

INFORMATION

FLAME ROLL-OUT DEVICE
All models are equipped with a thermal control device
on the burner cover. In case of flame roll-out, the device
will cause the circuit to open which shuts off all flow of
gas.

Set the thermostat
heat anticipator
according to the
current flow measured,
or the settings found in the
notes on the furnace wiring diagram (found inside the
furnace casing).

18-CD21 D1-4

........................

Installer's
ABNORMAL CONDITIONS
1. EXCESSIVE COMBUSTION VENT PRESSURE OR
FLUE BLOCKAGE
If pressure against the induced draft blower outlet
becomes excessive, the pressure switch will shut off
the gas valve until acceptable combustion pressure
is again available.
2. LOSS OF FLAME OR GAS SUPPLY FAILURE
If loss of flame occurs during a heating cycle (when
flame is not present at the sensor), the control module will retry the ignition sequence up to two times
after the sensor cools. If ignition is not achieved, it
will lockout the furnace.
3. POWER FAILURE
If there is a power failure during a heating cycle,
the system will restart the ignition sequence automatieally when power is restored, if the thermostat
still calls for heat.
4. INDUCED DRAFT BLOWER FAILURE
If pressure is not sensed by the pressure switch, it
will not allow the gas valve to open, therefore the
unit will not start. If failure occurs during a running
cycle, the pressure switch will cause the gas valve
to close and shut the unit down.
Carbon monoxide,
fire or smoke can cause serious
bodily injury, death, and/or property damage.
A variety of potential sources of carbon monoxide can be
found in a building or dwelling such as gas-fired clothes
dryers, gas cooking stoves, water heaters, furnaces and
fireplaces. The U.S. Consumer Product Safety Commission recommends
that users of gas-burning
appliances
install carbon monoxide detectors as well as fire and
smoke detectors per the manufacturers
installation
in-

structions to help alert dwelling occupants of the presence of fire, smoke or unsafe levels of carbon monoxide.
These devises should be listed by Underwriters
Laboratories, Inc. Standards for Single and Multiple Station
Carbon Monoxide Alarms,
UL 2034 or CSA International Standard, Residential Carbon Monoxide Alarming
Devices, CSA 6.19.
NOTE:
The manufacturer of your furnace does not test any detectors and makes no representations regarding any
brand or type of detector.

Failure to follow safety warnings exactly, could
result in a fire or explosion causing property
damage, personal injury or loss of life.
-- Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance.
-- WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• 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.
-- Installation and service must be performed by
a qualified installer, service agency or the gas
supplier.

INTEGRATED
FURNACE CONTROL
Normal - No call for Heat
Flashing Slow--Normal - Call for Heat
Flashing Fast--Continuous ON --Replace IFC
Continuous OFF --2 Flashes---

3 Flashes---

ERROR FLASH CODES

Check Power
System Lockout (Retries or Recycles exceeded)
Draft Pressure Error- Possible problems:
a) Venting problem
b) Pressure switch problem
c) Inducer problem

4 Flashes--5 Flashes ---

Open Temperature Limit Circuit
Flame sensed when no flame should be present

6 Flashes--7 Flashes ---

115 volt AC power reversed, poor grounding
Gas valve circuit error

8 Flashes---

Low flame sense signal
Check Ignitor Circuit and Line "N" to 24VAC "Common"
[possible grounding problem]

9 Flashes--18-CD21 D1-4

Guide

or system voltage too low

voltage (_<2 volts)

Installer's

Guide

Trane
6200 Troup Highway
Tyler, TX 75707

For more information contact
your local dealer (distributor)

Since the manufacturer has a policy of continuous product and product data improvement,
to change design and specifications without notice.

it reserves the right

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TRANE Furnace/Heater, Gas Manual L0905285

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