3
Table of Contents
F
URNACE
S
TARTUP
.......................................................................................................................................................... 26
F
URNACE
S
HUTDOWN
...................................................................................................................................................... 27
G
AS
S
UPPLY
P
RESSURE
M
EASUREMENT
.............................................................................................................................. 27
G
AS
M
ANIFOLD
P
RESSURE
M
EASUREMENT
AND
A
DJUSTMENT
.................................................................................................. 28
G
AS
I
NPUT
R
ATE
M
EASUREMENT
(N
ATURAL
G
AS
O
NLY
) ........................................................................................................... 30
T
EMPERATURE
R
ISE
......................................................................................................................................................... 30
C
IRCULATOR
B
LOWER
S
PEEDS
.......................................................................................................................................... 30
B
LOWER
H
EAT
O
FF
D
ELAY
T
IMINGS
.................................................................................................................................... 32
C
OMFORT
N
ET
™ S
YSTEM
.......................................................................................................................................................... 32
O
VERVIEW
..................................................................................................................................................................... 32
A
IRFLOW
C
ONDIDERATIONS
............................................................................................................................................... 33
F
OSSIL
F
UEL
A
PPLICATIONS
.............................................................................................................................................. 33
CTK0* W
IRING
............................................................................................................................................................. 33
F
OUR
-W
IRE
I
NDOOR
AND
OUTDOOR
W
IRING
....................................................................................................................... 33
T
WO
-W
IRE
O
UTDOOR
, F
OUR
-W
IRE
I
NDOOR
W
IRING
........................................................................................................... 34
C
OMFORT
N
ET
™ C
OMPATIBLE
F
URNACE
WITH
N
ON
-C
OMFORT
N
ET
COMPATIBLE
S
INGLE
-S
TAGE
A
IR
C
ONDITIONER
.............................. 34
C
OMFORT
N
ET
™ S
YSTEM
A
DVANCED
F
EATURES
............................................................................................................................. 34
T
HERMOSTAT
M
ENU
......................................................................................................................................................... 34
D
IAGNOSTICS
.................................................................................................................................................................. 34
N
ETWORK
TROUBLESHOOTING
........................................................................................................................................... 36
S
YSTEM
T
ROUBLESHOOTING
.............................................................................................................................................. 36
N
ORMAL
S
EQUENCE
OF
O
PERATION
............................................................................................................................................ 36
P
OWER
U
P
.................................................................................................................................................................... 36
H
EATING
M
ODE
............................................................................................................................................................... 36
C
OOLING
M
ODE
............................................................................................................................................................. 38
F
AN
O
NLY
M
ODE
............................................................................................................................................................ 38
O
PERATIONAL
C
HECKS
............................................................................................................................................................. 38
S
AFETY
C
IRCUIT
D
ESCRIPTION
................................................................................................................................................... 38
I
NTEGRATED
C
ONTROL
M
ODULE
......................................................................................................................................... 39
P
RIMARY
L
IMIT
................................................................................................................................................................ 39
A
UXILIARY
L
IMIT
............................................................................................................................................................. 39
R
OLLOUT
L
IMIT
.............................................................................................................................................................. 39
P
RESSURE
S
WITCHES
...................................................................................................................................................... 39
F
LAME
S
ENSOR
.............................................................................................................................................................. 39
T
ROUBLESHOOTING
................................................................................................................................................................. 39
E
LECTROSTATIC
D
ISCHARGE
(ESD) P
RECAUTIONS
................................................................................................................. 39
D
IAGNOSTIC
C
HART
......................................................................................................................................................... 39
F
AULT
R
ECALL
................................................................................................................................................................ 39
F
AULT
C
LEAR
S
EQUENCE
: ................................................................................................................................................ 39
R
ESETTING
F
ROM
L
OCKOUT
.............................................................................................................................................. 40
M
AINTENANCE
......................................................................................................................................................................... 40
A
NNUAL
I
NSPECTION
........................................................................................................................................................ 40
F
ILTERS
........................................................................................................................................................................ 40
F
ILTER
M
AINNTENANCE
..................................................................................................................................................... 40
F
ILTER
R
EMOVAL
............................................................................................................................................................. 40
H
ORIZONTAL
U
NIT
F
ILTER
R
EMOVAL
.................................................................................................................................... 40
M
EDIA
A
IR
F
ILTER
OR
E
LECTRONIC
A
IR
C
LEANER
R
EMOVAL
................................................................................................... 40
B
URNERS
...................................................................................................................................................................... 40
I
NDUCED
D
RAFT
AND
C
IRCULATOR
B
LOWERS
....................................................................................................................... 41
F
LAME
S
ENSOR
(Q
UALIFIED
S
ERVICER
O
NLY
) ...................................................................................................................... 41
F
LUE
P
ASSAGES
(Q
UALIFIED
S
ERVICER
O
NLY
) ..................................................................................................................... 41
B
EFORE
L
EAVING
AN
I
NSTALLATION
.............................................................................................................................................. 41
R
EPAIR
AND
R
EPLACEMENT
P
ARTS
.............................................................................................................................................. 41
T
ROUBLESHOOTING
C
HART
................................................................................................................................................ 42 - 46
S
TATUS
C
ODES
....................................................................................................................................................................... 47
A
IR
F
LOW
D
ATA
...................................................................................................................................................................... 48
D
IP
S
WITCHES
....................................................................................................................................................................... 49
W
IRING
D
IAGRAM
DM
80
VC
/
DC
80
VC
............................................................................................................................................ 50