Advertisement
T
O PREVENT UNRELIABLE OPERATION OR EQUIPMENT DAMAGE
INLET GAS SUPPLY PRESSURE MUST BE AS SPECIFIED ON THE UNIT
RATING PLATE WITH ALL OTHER HOUSEHOLD GAS FIRED APPLIANCES
.
OPERATING
Inlet gas supply pressures must be maintained within the ranges
specified in the following table. The supply pressure must be
constant and available with all other household gas fired appli-
ances operating. The minimum gas supply pressure must be
maintained to prevent unreliable ignition. The maximum must
not be exceeded to prevent unit overfiring.
Inlet Gas Supply Pressure
Natural Gas
Minimum:
Propane Gas
Minimum: 11.0" w.c.
A heat pump thermostat with three stages of heat is required
to properly use a two-stage furnace in conjunction with a
heat pump. Refer to the fossil fuel kit (AFE18-60A) installa-
tion instructions for additional thermostat requirements.
H
A
D
IGH
LTITUDE
ERATE
In some areas the gas supplier may artificially derate the gas
in an effort to compensate for the effects of altitude. If the
gas is artificially derated, the appropriate orifice size must be
determined based upon the BTU/ft
and the altitude. Refer to the National Fuel Gas Code, NFPA 54/
ANSI Z223.1 or CAN/CSA B149.1-15 in Canada, and informa-
tion provided by the gas supplier to determine the proper orifice
size.
P
G
C
ROPANE
AS
ONVERSION
P
,
OSSIBLE PROPERTY DAMAGE
OCCUR IF THE CORRECT CONVERSION KITS ARE NOT INSTALLED
APPROPRIATE KITS MUST BE APPLIED TO ENSURE SAFE AND PROPER
. A
FURNACE OPERATION
LL CONVERSIONS MUST BE PERFORMED BY A
QUALIFIED INSTALLER OR SERVICE AGENCY
As shipped, this unit is configured for natural gas. The LPM-09
is required to convert this furnace to operate on LP gas.
The correct kit must be used to insure safe and proper furnace
operation. All conversions must be performed by a qualified
installer, or service agency.
32
CAUTION
,
4.5" w.c.
Maximum: 10.0" w.c.
Maximum: 13.0" w.c.
content of the derated gas
3
WARNING
PERSONAL INJURY OR DEATH MAY
. T
.
G
V
AS
ALVE
This unit is equipped with a 24 volt gas valve which modulates
by pneumatic linkage to the combustion air blower. Taps for
THE
measuring the gas supply pressure and manifold pressure are
provided on the valve. This is a non-convertible, non-adjust-
able gas valve equipped for natural gas.
The gas valve has a manual ON/OFF control located on the valve
itself. This control may be set only to the "ON" or "OFF" posi-
tion. Refer to the lighting instructions label or the Startup Proce-
dure & Adjustment section of this manual for use of this con-
trol during start up and shut down periods.
G
P
C
AS
IPING
ONNECTIONS
T
O AVOID POSSIBLE UNSATISFACTORY OPERATION OF EQUIPMENT
DAMAGE DUE TO UNDERFIRING OR EQUIPMENT
/
OF NATURAL
PROPANE GAS PIPING NEEDED WHEN RUNNING PIPE FROM
/
THE METER
TANK TO THE FURNACE
The gas piping supplying the furnace must be properly sized based
on the gas flow required, specific gravity of the gas, and length
of the run. The gas line installation must comply with local codes,
or in their absence, with the latest edition of the National Fuel
Gas Code, NFPA 54/ANSI Z223.1 or CAN/CSA B149.1-15 in
Canada.
Natural Gas Capacity of Pipe In Cubic Feet of Gas Per Hour (CFH)
Nominal
Actual ID:
0.622
Length (ft)
10
170
20
118
30
40
50
HE
60
70
80
90
100
125
150
175
200
250
This chart refers to natural gas w ith an inlet pressure of less than 2 psi and a
pressure drop of 0.5" W.C. Specific gravity is 0.60.
CFH =
BTUH Furnace Input
To connect the furnace to the building's gas piping, the installer
must supply a ground joint union, drip leg, manual shutoff 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.
WARNING
.
Pipe Size (in.)
½
¾
1
1¼
0.824
1.049
1.380
Capacity in Cubic Feet of Gas per Hour
360
678
1390
247
466
957
95
199
374
768
81
170
320
657
72
151
284
583
65
137
257
528
60
126
237
486
56
117
220
452
52
110
207
424
50
104
195
400
44
92
173
355
40
83
157
322
37
77
144
296
34
71
134
275
30
63
119
244
Heating Valve of Gas (BTU/Cubic Foot)
,
USE THE PROPER SIZE
1½
2
2½
1.610
2.067
2.469
2090
4020
6400
1430
2760
4400
1150
2220
3530
985
1900
3020
873
1680
2680
791
1520
2430
728
1400
2230
677
1300
2080
635
1220
1950
600
1160
1840
532
1020
1630
482
928
1480
443
854
1360
412
794
1270
366
704
1120
Advertisement
