Detroit Radiant Products UH-30 Installation, Operation, Maintenance And Parts page 19

UH Series
Chart 3.4 • Maximum capacity for Schedule 40 Metallic pipe, in CFH
Pipe
1/2"
Length
Nat L.P.
(feet)
10'
132
20' 92
30'
73
40'
63
50' 56
60'
50
70'
46
80' 43
90' 40
100'
38
125'
34
150' 31
175'
28
200'
26
The UH Series heater is equipped to receive a gas supply line nipple of ½"NPT Schedule 40 metallic
pipe. All piping must be installed in accordance with the requirements outlined in the National Fuel Gas
Code ANSI/Z223.1 (latest edition) or CSA-B149.1 and B149.2. Support all gas supply piping with pipe
hangers, metal strapping, or other suitable material. Do not rely on the heater to support the gas pipe.
When connecting piping to the unit, the use of a thread joint compound is required. The thread
compound (pipe dope) shall be resistant to the action of liquefied petroleum gas or any other chemical
constituents of the gas to be conducted through the piping. Use of Teflon
Install a ground joint union with a brass seat and a manual shut off valve adjacent the unit for
emergency shut off and easy servicing of controls. A 1/8" NPT plugged tap that is accessible for a test
gauge connections is also recommended, as illustrated in Figure 3.4.
A sediment trap must be installed in the supply line in the lowest spot prior to connecting to the heater.
The trap length shall be at least three inches long. Ideally, the trap would be installed as close as
possible to the shut off, as shown in Figure 3.4.
3/4"
Nat L.P. Nat
86 278 182 520
60 190 124 350
48 152 99 285
41 130 85 245
37 115 75
33 105 69 195
30 96 63 180
28 90 59
26 84 55 160
25 79 52 150
22 72 47 130
20 64 42 120
18 59 39
17 55 36 100
WARNING
!
Always use two (2) opposing wrenches to tighten mating pipe connections
to prevent excessive torque on the gas valve and manifold pipe. Excessive
torque can damage the valve and/or misalign the orifice, resulting in fire,
explosion, serious injury or death.
3.0 Installation
1" 1-1/4"
L.P. Nat
340 1050
229 730
186 590
160 500
215 141 440
127 400
118 370
170 111 350
105 320
98 305
85 275
78 250
110 72 225
65 210
19
• Gas Supply Installation Instructions
1-1/2"
L.P. Nat L.P.
686 1600 1046
477 1100 719
386 890 582
327 760 497
288 670 438
261 610 399
242 560 366
229 530 346
209 490 320
199 460 301
180 410 268
163 380 248
147 350 229
137 320 209
tape is not permitted.
®
2"
Nat L.P.
3050 1993
2100 1373
1650 1078
1450 948
1270 830
1150 752
1050 686
990 647
930 608
870 569
780 510
710 464
650 425
610 399