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42

T

ROUBLESHOOTING

 C

HART

•Furnace lockout

due to an excessive
number of ignition
“retries” (3 total)

1

.

•Locate and correct

gas interruption.

•Check front cover

pressure switch
operation (hose,
wiring, contact
operation). Correct if
necessary.

•Replace or realign

igniter.

•Check flame sense

signal. Sand sensor if
coated and/or
oxidized.

•Check flue piping for

blockage, proper
length, elbows, and
termination.

•Verify proper induced

draft blower perfor-
mance.

•Turn power

OFF prior to
repair.

•Igniter is

fragile, handle
with care.

•Sand flame

sensor with
emery cloth.

•See “Vent/

Flue Pipe”
section for
piping details.

•Furnace fails to

operate.

•Integrated control

module diagnostic 

LED

is flashing 

ONE 

(1) flash.

1

1 FLASH

•Failure to establish flame.

Cause may be no gas to
burners, front cover
pressure switch stuck
open, bad igniter or
igniter alignment,
improper orifices, or
coated/oxidized or
improperly connected
flame sensor.

•Loss of flame after

establishment. Cause may
be interrupted gas supply,
lazy burner flames
(improper gas pressure or
restriction in flue and/or
combustion air piping),
front cover pressure
switch opening, or
improper induced draft
blower performance.

• Pressure switch

circuit is closed.

• Induced draft

blower 

is not

operating.

•Turn power OFF

prior to repair.

•Replace pressure

switch with
proper replace-
ment part.

•Furnace fails to

operate.

•Integrated control

module diagnostic 

LED

is flashing 

TWO 

(2)

flashes.

2

2 FLASHES

•Induced draft blower

pressure switch contacts
sticking.

•Shorts in pressure switch

circuit.

•Pressure switch hose

blocked, pinched or
connected improperly.

•Blocked flue and/or inlet

air pipe, blocked drain
system, or weak induced
draft blower.

•Incorrect pressure

switch setpoint or
malfunctioning switch
contacts.

•Loose or improperly

connected wiring.

• Pressure switch

circuit not closed.

• Induced draft

blower 

is 

operat-

ing.

•Induced draft blower

runs continuously with
no further furnace
operation.

•Integrated control

module diagnostic 

LED

is flashing 

THREE 

(3)

flashes.

3

3 FLASHES

•Turn power

OFF prior to
repair.

•Replace

pressure
switch with
proper
replacement
part.

Fault

Description(s)

Possible Causes

Associated
LED Code

2

• Normal Operation

• Normal Operation

•None

• Normal Operation

•No 115 volt power

to furnace, or no 24
volt power to
integrated control
module.

•Blown fuse or

circuit breaker.

•Integrated control

module has an
internal fault.

•Manual disconnect

switch OFF, door switch
open, or 24 volt wires
improperly connected or
loose.

•Blown fuse or circuit

breaker.

•Integrated control

module has an internal
fault.

•Assure 115 and 24 volt

power to furnace
integrated control
module.

•Check integrated

control module fuse
(3A).  Replace if
necessary.

•Check for possible

shorts in 115 and 24
volt circuits.  Repair
as necessary.

•Replace bad inte-

grated control module.

•Turn power OFF

prior to repair.

•Replace  inte-

grated  control
module fuse with
3A automotive
fuse.

•Read precautions

in “Electrostatic
Discharge”
section of manual.

•Furnace fails to

operate.

•Integrated control

module diagnostic 

LED

provides 

no signal

.

NONE

Corrective Action

Cautions &

Notes

Symptoms of Abnormal

Operation

•LED is Steady On.

•Replace induced draft

blower pressure
switch.

•Repair short.

•Inspect  pressure

switch hose. Repair,
if necessary,

•Inspect flue and/or

inlet air piping for
blockage, proper
length, elbows, and
termination. Check
drain system.
Correct as
necessary.

•Correct pressure

switch setpoint or
contact motion.

•Tighten or correct

wiring connection.

ON

CONTINUOUS

ON

1

Integrated control module will automatically attempt to reset from lockout after one hour.

2

LED Flash code will cease if power to the control module is interrupted through the disconnect or door switch.

Summary of Contents for *CSS920402BN

Page 1: ...ETY PRECAUTION is a registered trademark of Maytag Corporation or its related companies and is used under license All rights reserved TABLE OF CONTENTS SAFETY CONSIDERATIONS 3 SHIPPING INSPECTION 4 EL...

Page 2: ...RAP PRIMING 33 FURNACE OPERATION 33 GAS SUPPLY PRESSURE MEASUREMENT 34 GAS MANIFOLD PRESSURE MEASUREMENT AND ADJUSTMENT 34 GAS INPUT RATE MEASUREMENT NATURAL GAS ONLY 35 TEMPERATURE RISE 36 CIRCULATOR...

Page 3: ...ns when install ing adjusting altering servicing or operating the furnace To ensure proper installation and operation thoroughly read this manual for specifics pertaining to the installation and appli...

Page 4: ...ome loose in transit In the event of damage the consignee should 1 Make a notation on delivery receipt of any visible damage to shipment or container 2 Notify carrier promptly and request an inspectio...

Page 5: ...for use with natural or propane gas NOTE If using propane a propane conversion kit is required Dual certification means that the combustion air inlet pipe is optional and the furnace can be vented as...

Page 6: ...ing combustion products outdoors through a proper venting system Special consideration should begiventovent fluepiperoutingandcombustionairintakepipewhenapplicable Referto Vent FluePipeandCombustion A...

Page 7: ...snecessary useanaccessory subbase seeSpecificationSheetapplicableforyourmodelfordetails Aspecialaccessorysubbasemustbeusedforupright counterflow unit installations over any combustible material includ...

Page 8: ...any unused openings in the venting system 2 Inspect the venting system for proper size and horizontal pitch as required by the National Fuel Gas Code ANSI Z223 1 or the Natural Gas and Propane Install...

Page 9: ...back drafting or improper combustion of gas fired appliances thereby exposing building occupants to gas combustion products that could include carbon monoxide If this furnace is to be installed in th...

Page 10: ...tothefurnacesidepanel suspendingitbelowthefurnace Aminimum clearance of 5 5 below the furnace must be provided for the drain trap Additionally the appropriate downward piping slope must be maintained...

Page 11: ...all vent flue piping and connectorsarecompatiblewithfurnaceflueproducts Additionally itistheresponsibilityoftheinstallertoensurethatallpipingand connections possess adequate structural integrity and s...

Page 12: ...n from a 2 to 3 pipe in a horizontal section of pipe as this may create a water trap PREFERRED TRANSITION NO LESS THAN 45 DEGREES TO HORIZONTAL PLANE TO AVOID CREATING A WATER TRAP IN VENT PIPING ACCE...

Page 13: ...orted Vent FluePipe The vent pipe outlet is sized to accept 2 pipe Secure vent flue pipe directly into the furnace fitting with the appropriate glue Alternately a small section of 2 pipe may be glued...

Page 14: ...r outlet 5 Install cut end of the flanged section and connect to inducer with rubber coupling supplied with furnace 6 Install screws removed in step 1 securing flange to cabinet THE RUBBER ELBOW IS NO...

Page 15: ...ness plus the depth of the socket fittings to be installed on the inside and outside of the wall The wall penetration should be sealed with silicone caulking material NOTE Terminate both pipes in the...

Page 16: ...Condensate trapped to prevent flue gas from escaping and routed to field supplied condensate disposal Combustion Air Pipe Vent Pipe All piping and fittings must be joined per material manufacturer s s...

Page 17: ...termining the number of elbows in the piping systems If the combustion air intake pipe is to be installed above a finished ceiling or other area where dripping of condensate will be objectionable insu...

Page 18: ...Refer to the directions furnished with the Side Wall Vent Kit p n 0170K00000S or 0170K00001S for installation specifica tions CONDENSATE DRAIN LINES DRAIN TRAP A condensing gas furnace achieves its hi...

Page 19: ...ed horizontally require the trap to be relocated Many drain hoses have a built in grommet which will provide a cabinet seal when installed See instructions below for your model and installation positi...

Page 20: ...Remove the trap and two hoses from the blower deck 4 Remove the two plugs from the right side of the cabinet and install them in the blower deck 5a Draining the Vent Elbow Locate hose 2 factory instal...

Page 21: ...e the trap to the cabinet using two screws removed in step 2 by inserting the two screws through the large set of holes in the top mounting tabs of the trap into the two predrilled holes in the side o...

Page 22: ...clamps 7 Fasten the drain trap to the cabinet with two screws removed in step 2 8 Refer to Field Supplied Drain section for instructions on field supplied installed drain on outlet of furnace trap COU...

Page 23: ...e observed when making field connections Line voltage connections can be made through either the right or left side panel The furnace is shipped configured for a left side right side for counterflows...

Page 24: ...ig ured for a left side electri cal connection To make electrical connections through the opposite side of the furnace the junction box must be relocated to the left side prior to making electrical co...

Page 25: ...The combination of the lower air density and a lower manifold pressure will prohibit the burner orifice from drawing the proper amount of air into the burner This may cause incomplete combustion flash...

Page 26: ...valve and line and fittings to connect to gas valve In some cases the installer may also need to supply a transition piece from 1 2 pipe to a larger pipe size Thefollowingstipulationsapplywhenconnect...

Page 27: ...rd Gas Line Hole Ground Joint Pipe Union Ground Joint Pipe Union NOTE Union may be inside furnace cabinet where allowed by local codes COUNTERFLOW Figure 32 Drip Leg Plug in Main Gas Line Hole Alterna...

Page 28: ...sulting in heat exchanger failure Disconnect this unit and shutoff valve from the gas supply piping system before pressure testing the supply piping system with pressures in excess of 1 2 psig 3 48 kP...

Page 29: ...g plate for the maximum ESP ex ternal duct static rating Total external static refers to everything external to the fur nace cabinet Cooling coils filters ducts grilles registers must all be considere...

Page 30: ...s retaining the sheet metal over the duct opening Using tin snips cut the metal strips and remove the sheet metal covering the duct opening In the corners of the open ing cut the sheet metal along the...

Page 31: ...BN 2 10 X 20 or 1 16 X 25 Top Return CSS9 0804CN 2 10 X 20 or 1 16 X 25 Top Return CSS9 1005CN 2 14 X 20 or 1 20 X 25 Top Return CSS961205DN 2 14 X 20 or 1 20 X 25 Top Return Other size filters of equ...

Page 32: ...11 5 2 X 1600 CFM 2 16 in X 25 in x 5 AM11 3225 5 AM11 3225 AM11 5PP AM11 5 AM11 5RA AM11 5PP Family Family Family Upright Installations Depending on the installation and or customer preference differ...

Page 33: ...uipped with an ignition device which automatically lights the burner Do not try to light the burner by hand 5 Move the furnace gas valve manual control to the OFF position 6 Wait five minutes then sme...

Page 34: ...2 gas valve then use the 36G J Valve Pressure Check Kit Part No 0151K00000S 3 TurnONthegassupplyandoperatethefurnaceandallothergasconsuming appliances on the same gas supply line 4 Measure furnace gas...

Page 35: ...s to gas conversion consult your dealer for appropriate conversion GAS INPUT RATE MEASUREMENT NATURAL GAS ONLY The actual gas input rate to the furnace must never be greater than that specified on the...

Page 36: ...stalled with the furnace If the cooling capacity is in BTU hr divide it by 12 000 to convert capacity to tons Example Cooling Capacity of 30 000 BTU hr 30 000 12 000 2 5 Tons 2 Determine the proper ai...

Page 37: ...rol module monitors flame presence Gas valve will remain open only if flame is detected Circulator blower is energized on heat speed following a thirty 30 second blower on delay 96 models 115 VAC EAC...

Page 38: ...rmally closed electrically automatic reset temperature activated sensor The limit guards against overheating as a result of insufficient conditioned air passing over the heat exchanger AUXILIARY LIMIT...

Page 39: ...e control is in standby mode no call for heat or cool press the FAULT RECALL switch for five to ten seconds or until the diagnostic LED begins to rapid flash When the switch is released the LED will t...

Page 40: ...e To remove 1 Turn OFF electrical power to furnace 2 Remove filter s from the central return register or ductwork 3 Replace filter s by reversing the procedure for removal 4 TurnONelectricalpowertofur...

Page 41: ...should be as indicated in the Specifications Sheet FLUE PASSAGES QUALIFIED SERVICER ONLY The heat exchanger flue passageways should be inspected at the beginning of each heating season BEFORE LEAVING...

Page 42: ...Loose or improperly connected wiring Pressure switch circuit not closed Induced draft blower is operat ing Induced draft blower runs continuously with no further furnace operation Integrated control m...

Page 43: ...5 5 FLASHES Short to ground in flame sense circuit Furnace fails to operate Integrated control module diagnostic LED is flashing SIX 6 flashes No furnace operation Rollout limit open Integrated contro...

Page 44: ...5 1084 1005 HIGH 5 0 2284 30 2231 31 2170 31 2103 32 2037 33 1945 1836 1750 MED 4 0 1865 37 1869 36 1775 38 1732 39 1684 40 1619 1548 1480 MED LO 3 5 1594 43 1571 43 1530 45 1492 46 1454 47 1414 1355...

Page 45: ...N A 610 N A 604 571 519 HIGH 5 0 2233 32 2159 33 2086 34 2024 35 1941 37 1850 1753 1651 MED 4 0 1820 39 1778 40 1742 41 1695 42 1638 43 1551 1485 1384 MED LO 3 5 1571 45 1535 46 1497 48 1446 49 1402...

Page 46: ...TIONS N E C CLASS 2 WIRE GR GND 115 VAC 24 VAC BLOWER COMPARTMENT DOOR SWITCH OPEN WHEN DOOR OPEN DOOR SWITCH WARNING DISCONNECTPOWER BEFORE SERVICING WIRING TO UNITMUSTBE PROPERLY POLARIZED AND GROUN...

Page 47: ...GND 115 VAC 24 VAC BLOWER COMPARTMENT DOOR SWITCH OPEN WHEN DOOR OPEN DOOR SWITCH WARNING DISCONNECTPOWER BEFORE SERVICING WIRING TO UNITMUST BE PROPERLY POLARIZEDAND GROUNDED BK GND DISCONNECT L N PO...

Page 48: ...tly mounted to the exterior of the building at a minimum height of eight 8 feet above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating appliance or...

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