Electrical connections – Kees IFG (INDIRECT FIRED GAS) MAKE-UP AIR UNITS - Duct Furnace Installation & Maintenance Manual User Manual
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Nominal
Iron
Pipe Size
Internal
Dia.
Maximum Capacity of Pipe in Cubic Feet of Gas per Hour for Gas Pressures of 0.5 psig (3.5 kPa) or Less,
and a Pressure Drop of 0.5 Inch Water Column (124.4 Pa)
(Based on a 0.60 Specific Gravity Gas)
Length of Pipe, ft. (Meters)
GAS PIPE SIZE
in.
in.
10
20
30
40
50
60
70
80
90
100
125
150
175
200
(mm)
(3.0)
(6.1)
(9.1)
(12.2)
(15.2) (18.3)
(21.3)
(24.4)
(27.4)
(30.5)
(38.1)
(45.7)
(53.3)
(61.0)
1/2
0.622
175
120
97
82
73
66
61
57
53
50
44
40
37
35
(16)
(4.96)
(3.40)
(2.75)
(2.32)
(2.07) (1.87)
(1.73)
(1.61)
(1.50)
(1.42)
(1.25)
(1.13)
(1.05)
(0.99)
3/4
0.824
360
250
200
170
151
138
125
118
110
103
93
84
77
72
(21)
(10.2)
(7.08)
(5.66)
(4.81)
(4.28) (3.91)
(3.54)
(3.34)
(3.11)
(2.92)
(2.63)
(2.38)
(2.18)
(2.04)
1
1.049
680
465
375
320
285
260
240
220
205
195
175
160
145
135
(27)
(19.3)
(13.2)
(10.6)
(9.06)
(8.07) (7.36)
(6.80)
(6.23)
(5.80)
(5.52)
(4.96)
(4.53)
(4.11)
(3.82)
1 1/4
1.380
1400
950
770
660
580
530
490
460
430
400
360
325
300
280
(35)
(39.6)
(26.9)
(21.8)
(18.7)
(16.4) (15.0)
(13.9)
(13.0)
(12.2)
(11.3)
(10.2)
(9.20)
(8.50)
(7.93)
1 1/2
1.610
2100
1460
1180
990
900
810
750
690
650
620
550
500
460
430
(41)
(59.5)
(41.3)
(33.4)
(28.0)
(25.5) (22.9)
(21.2)
(19.5)
(18.4)
(17.6)
(15.6)
(14.2)
(13.0)
(12.2)
2
2.067
3950
2750
2200
1900
1680
1520
1400
1300
1220
1150
1020
950
850
800
(53)
(112)
(77.9)
(62.3)
(53.8)
(47.6) (43.0)
(39.6)
(36.8)
(34.5)
(32.6)
(28.9)
(26.9)
(24.1)
(22.7)
2 1/2
2.469
6300
4350
3520
3000
2650
2400
2250
2050
1950
1850
1650
1500
1370
1280
(63)
(178)
(123)
(99.7)
(85.0)
(75.0) (68.0)
(63.7)
(58.0)
(55.2)
(52.4)
(46.7)
(42.5)
(38.8)
(36.2)
3
3.068
11000
7700
6250
5300
4750
4300
3900
3700
3450
3250
2950
2650
2450
2280
(78)
(311)
(218)
(177)
(150)
(135)
(122)
(110)
(105)
(97.7)
(92.0)
(83.5)
(75.0)
(69.4)
(64.6)
4
4.026
23000
15800
12800
10900
9700
8800
8100
7500
7200
6700
6000
5500
5000
4600
(102)
(651)
(447)
(362)
(309)
(275)
(249)
(229)
(212)
(204)
(190)
(170)
(156)
(142)
(130)
Chart 3
1.
*See local codes before installing 1/2" pipe.
Input Rate of Unit
2. FOR NATURAL GAS: cu. ft./hr. =
Btu Value of Gas
3. FOR PROPANE GAS: Multiply the Cu. Ft. / Hr. obtained in note 2 by 0.633 before entering chart.
ELECTRICAL CONNECTIONS
HAZARDOUS VOLTAGE!
DISCONNECT ALL ELECTRIC
POWER INCLUDING REMOTE
DISCONNECTS BEFORE
SERVICING. Failure to
disconnect power before
servicing can cause severe
personal injury or death.
The rooftop duct furnace is wired at the factory and
ready to be connected. Actual wiring will differ
according to the options used. Each furnace will be
shipped with its own wiring diagram; refer to this wiring
diagram for all electrical connections to the unit.
All electrical connections must conform to: ANSI/NFPA
No. 70-1999 (or latest edition) National Electrical Code
and applicable local codes; In Canada, to the Canadian
Electrical Code, Part I CSA Standard C22.1.
Do not use any tools (i.e. screwdriver,
pliers, etc.) across the terminals to check for power.
Use a voltmeter.
The outdoor conduits leading into the unit should be
installed to prevent rain from wetting any high voltage
wire. Locate the thermostat in accordance with the
instructions packed with each thermostat.
NOTICE: Should any original wire supplied with the
heater have to be replaced, it must be replaced with
wiring material having a temperature rating of at least
105°C (221°F).