3
Table of Contents
X. CIRCULATING AIR AND FILTERS ................................................................................................................................ 21
D
UCTWORK
- A
IR
F
LOW
................................................................................................................................. 21
F
ILTERS
- R
EAD
T
HIS
S
ECTION
B
EFORE
I
NSTALLING
T
HE
R
ETURN
A
IR
D
UCTWORK
.................................................. 22
U
PRIGHT
I
NSTALLATIONS
................................................................................................................................. 22
C
IRCULATION
A
IR
F
ILTERS
............................................................................................................................... 22
H
ORIZONTAL
I
NSTALLATIONS
............................................................................................................................ 22
XI. SEQUENCE OF OPERATION ...................................................................................................................................... 22
(INTEGRATED IGNITION CONTROL) .............................................................................................................................. 22
N
ORMAL
H
EATING
S
EQUENCE
.......................................................................................................................... 22
N
ORMAL
C
OOLING
S
EQUENCE
- I
NTEGRATED
I
GNITION
C
ONTROL
........................................................................... 23
C
ONSTANT
F
AN
............................................................................................................................................. 23
XII. START-UP PROCEDURE AND ADJUSTMENT .......................................................................................................... 23
F
URNACE
OPERATION
...................................................................................................................................... 23
F
URNACE
S
TART
-
UP
....................................................................................................................................... 23
F
URNACE
S
HUTDOWN
..................................................................................................................................... 23
G
AS
S
UPPLY
P
RESSURE
M
EASUREMENT
........................................................................................................... 24
G
AS
M
ANIFOLD
P
RESSURE
M
EASUREMENT
AND
A
DJUSTMENT
............................................................................... 24
G
AS
I
NPUT
R
ATE
M
EASUREMENT
(N
ATURAL
G
AS
O
NLY
) ..................................................................................... 25
T
EMPERATURE
R
ISE
....................................................................................................................................... 25
C
IRCULATOR
B
LOWER
S
PEED
A
DJUSTMENT
....................................................................................................... 25
A
DJUST
B
LOWER
H
EAT
O
FF
D
ELAY
................................................................................................................. 27
C
IRCULATOR
B
LOWER
F
AN
T
IMING
A
DJUSTMENT
................................................................................................ 27
XIII. OPERATIONAL CHECKS ........................................................................................................................................... 27
B
URNER
F
LAME
............................................................................................................................................. 27
A
UXILIARY
L
IMIT
C
ONTROL
.............................................................................................................................. 27
P
RIMARY
L
IMIT
.............................................................................................................................................. 28
XIV. SAFETY CIRCUIT DESCRIPTION ............................................................................................................................. 28
G
ENERAL
..................................................................................................................................................... 28
I
NTEGRATED
C
ONTROL
M
ODULE
....................................................................................................................... 28
P
RIMARY
L
IMIT
.............................................................................................................................................. 28
A
UXILIARY
L
IMIT
............................................................................................................................................ 28
R
OLLOUT
L
IMITS
........................................................................................................................................... 28
P
RESSURE
S
WITCHES
..................................................................................................................................... 28
F
LAME
S
ENSOR
............................................................................................................................................. 28
XV. TROUBLESHOOTING ................................................................................................................................................ 28
E
LECTROSTATIC
D
ISCHARGE
(ESD) P
RECAUTIONS
............................................................................................. 28
D
IAGNOSTIC
C
HART
....................................................................................................................................... 28
R
ESETTING
F
ROM
L
OCKOUT
............................................................................................................................ 29
XVI. MAINTENANCE ......................................................................................................................................................... 29
A
NNUAL
INSPECTION
....................................................................................................................................... 29
F
ILTERS
....................................................................................................................................................... 29
F
ILTER
M
AINTENANCE
..................................................................................................................................... 29
F
ILTER
R
EMOVAL
........................................................................................................................................... 29
U
PRIGHT
F
ILTER
R
EMOVAL
.............................................................................................................................. 29
I
NDUCED
D
RAFT
AND
C
IRCULATOR
B
LOWER
M
OTORS
.......................................................................................... 29
F
LAME
S
ENSOR
(Q
UALIFIED
S
ERVICER
O
NLY
) .................................................................................................... 30
I
GNITER
(Q
UALIFIED
S
ERVICER
O
NLY
) ............................................................................................................... 30
B
URNERS
..................................................................................................................................................... 30
XVII. BEFORE LEAVING AN INSTALLATION ................................................................................................................... 30
XVIII. REPAIR AND REPLACEMENT PARTS ................................................................................................................... 30
