20
C
C
C
C
C
I R
I R
I R
I R
I RC U L
C U L
C U L
C U L
C U LA
A
A
A
AT I N G
T I N G
T I N G
T I N G
T I N G
A
A
A
A
A
I R
I R
I R
I R
I R
A N D
A N D
A N D
A N D
A N D
F
F
F
F
F
I L
I L
I L
I L
I LT E R S
T E R S
T E R S
T E R S
T E R S
3/8"
1/2"
5/8"
3/4"
7/8"
1-1/8"
1/2"
3/4"
1"
1-1/4" 1-1/2"
10
39
92
199
329
501
935
275
567
1,071
2,205
3,307
20
26
62
131
216
346
630
189
393
732
1,496
2,299
30
21
50
107
181
277
500
152
315
590
1,212
1,858
40
19
41
90
145
233
427
129
267
504
1,039
1,559
50
18
37
79
131
198
376
114
237
448
91
1,417
60
16
35
72
121
187
340
103
217
409
834
1,275
80
13
29
62
104
155
289
89
185
346
724
1,066
100
11
26
55
90
138
255
78
162
307
630
976
125
10
24
48
81
122
224
69
146
275
567
866
150
9
21
43
72
109
202
63
132
252
511
787
200
8
19
39
66
100
187
54
112
209
439
665
250
8
17
36
60
93
172
48
100
185
390
590
Pipe or
Tubing
Length,
Feet
Nominal Pipe Size
Schedule 40
Tubing Size, O.D. Type L
Sizing Between Second Stage and Appliance Regulator*
Maximum Pro pane Capacities listed are based on 2 psig p re ssure drop a t 10 psig setting.
Cap acities in 1,000 BTU/h our.
C
C
C
C
C
I R
I R
I R
I R
I RC U L
C U L
C U L
C U L
C U LA
A
A
A
ATING
TING
TING
TING
TING
A
A
A
A
A
I R
I R
I R
I R
I R
A N D
A N D
A N D
A N D
A N D
F
F
F
F
F
I L
I L
I L
I L
I LTERS
TERS
TERS
TERS
TERS
N
EVER
ALLOW
THE
PRODUCTS
OF
COMBUSTION
,
INCLUDING
CARBON
MONOXIDE
,
TO
ENTER
THE
RETURN
DUCT
WORK
OR
CIRCULATION
AIR
SUPPLY
.
WARNING
Duct systems and register sizes must be properly designed for the
CFM and external static pressure rating of the furnace. Ductwork
should be designed in accordance with the recommended meth-
ods of “Air Conditioning Contractors of America” Manual D.
A duct system must be installed in accordance with Standards of
the National Board of Fire Underwriters for the Installation of Air
Conditioning, Warm Air Heating and Ventilating Systems. Pamphlets
No. 90A and 90B.
A closed return duct system must be used, with the return duct
connected to the furnace. NOTE:
NOTE:
NOTE:
NOTE:
NOTE:
Ductwork must never be at-
tached to the back of the furnace. For installations requiring more
than 1800 CFM, use a bottom return or two sided return. Supply and
return connections to the furnace may be made with flexible joints
to reduce noise transmission. To prevent the blower from inter-
fering with combustion air or draft when a central return is used, a
connecting duct must be installed between the unit and the utility
room wall. A room, closet, or alcove must not be used as a return air
chamber.
When the furnace is used in connection with a cooling unit, the
furnace should be installed in parallel with or on the upstream side
of the cooling unit to avoid condensation in the heating element.
With a parallel flow arrangement, the dampers or other means used
to control the flow of air must be adequate to prevent chilled air
from entering the furnace and, if manually operated, must be
equipped with means to prevent operation of either unit unless the
damper is in the full heat or cool position.
When the furnace is installed without a cooling coil, it is recom-
mended that a removable access panel be provided in the outlet air
duct. This opening shall be accessible when the furnace is installed
and shall be of such a size that the heat exchanger can be viewed
for visual light inspection or such that a sampling probe can be
inserted into the airstream. The access panel must be made to pre-
vent air leaks when the furnace is in operation.
When the furnace is heating, the temperature of the return air
entering the furnace must be between 55°F and 100°F.
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 sealed to the furnace
casing and terminating outside the space containing the furnace.
F
FF
F
F
ILTERS
ILTERS
ILTERS
ILTERS
ILTERS
- R
- R
- R
- R
- R
EAD
EAD
EAD
EAD
EAD
T
T
T
T
T
HIS
HIS
HIS
HIS
HIS
S
S
S
S
S
ECTION
ECTION
ECTION
ECTION
ECTION
B
B
B
B
B
EFORE
EFORE
EFORE
EFORE
EFORE
I
I
I
I
I
NSTALLING
NSTALLING
NSTALLING
NSTALLING
NSTALLING
T
T
T
T
T
HE
HE
HE
HE
HE
R
R
R
R
R
ETURN
ETURN
ETURN
ETURN
ETURN
A
A
A
A
A
IR
IR
IR
IR
IR
D
D
D
D
D
UCTWORK
UCTWORK
UCTWORK
UCTWORK
UCTWORK
Filters must be used with this furnace. Discuss filter maintenance
with the building owner. Filters do not ship with this furnace, but
must be provided by the installer. Filters must comply with UL900
or CAN/ULCS111 standards. If the furnace is installed without filters,
the warranty will be voided.
NO
NO
NO
NO
NOTE:
TE:
TE:
TE:
TE: An undersized opening will cause reduced airflow. The
bottom return is set up as a knock out.
U
U
U
U
U
PRIGHT
PRIGHT
PRIGHT
PRIGHT
PRIGHT
I I I I I
NSTALLATIONS
NSTALLATIONS
NSTALLATIONS
NSTALLATIONS
NSTALLATIONS
Depending on the installation and/or customer preference, differ-
ing filter arrangements can be applied. Filters can be installed in
the central return register or a side panel external filter rack kit
(upflows), or the ductwork above a downflow furnace. As an alter-
native, a media air filter or electronic air cleaner can be used as the
primary filter.
C
C
C
C
C
IRCULATION
IRCULATION
IRCULATION
IRCULATION
IRCULATION
A
A
A
A
A
IR
IR
IR
IR
IR
F
F
F
F
F
ILTERS
ILTERS
ILTERS
ILTERS
ILTERS
One of the most common causes of a problem in a forced air heat-
ing system is a blocked or dirty filter. Circulating air filters must be
inspected monthly for dirt accumulation and replaced if necessary.
Failure to maintain clean filters can cause premature heat exchanger
failure.
A new home may require more frequent replacement until all con-
struction dust and dirt is removed. Circulating air filters are to be
installed in the return air duct external to the furnace cabinet.
FURNACE INPUT
FILTER SIZE
45M
320 in
2
70M
483 in
2
90M
640 in
2
115M
800 in
2
140M
738 in
2
DISPOSABLE NOMINAL 300 F.M. FACE VELOCITY
MINIMUM FILTER SIZES for DISPOSABLE FILTERS
H
H
H
H
H
ORIZONTAL
ORIZONTAL
ORIZONTAL
ORIZONTAL
ORIZONTAL
I I I I I
NSTALLATIONS
NSTALLATIONS
NSTALLATIONS
NSTALLATIONS
NSTALLATIONS
Filters must be installed in either the central return register or in the
return air duct work.
SSSSS
EQUENCE
EQUENCE
EQUENCE
EQUENCE
EQUENCE
O F
O F
O F
O F
O F
O
O
O
O
O
PER
PER
PER
PER
PERA
A
A
A
ATION
TION
TION
TION
TION
(I
(I
(I
(I
(I
NTEGR
NTEGR
NTEGR
NTEGR
NTEGRA
A
A
A
ATED
TED
TED
TED
TED
I
I
I
I
I
GNITION
GNITION
GNITION
GNITION
GNITION
C
C
C
C
C
ONTR
ONTR
ONTR
ONTR
ONTRO L
O L
O L
O L
O L
)))))
Refer to Timing Charts for sequencing.
NOTE:
NOTE:
NOTE:
NOTE:
NOTE: Dip switch positions referenced in this section applies to
*(M,D)H8 models only.
P
P
P
P
P
OWER
OWER
OWER
OWER
OWER
U
U
U
U
U
P
P
P
P
P
•
115 VAC power applied to furnace.
