Installation instructions (cont’d), Polytube selection, Conversion table – Reznor UDBS Option - Installation - Polytube Adapter Instructions User Manual
Page 4
Form RZ-NA I-UD-PA, P/N 203188 Rev 4, Page 4
Installation
Instructions
(cont’d)
(800) 695-1901, www.RezSpec.com
©2014 Reznor, LLC. All rights reserved.
MANUFACTURER OF HEATING, COOLING, AND VENTILATING SYSTEMS
Trademark Note: Reznor
®
, T
CORE
2
®
, and
®
are registered in at least the United States.
0514 OG POD Form I-UD-PA (Version .4)
the instructions in the heater manual, adjust the speed of the blower to achieve
the desired range while maintaining motor current draw below the full load
amperes shown on the motor rating plate.
Polytube Selection
Polytube selection is the responsibility of the installer. Different grades, hole positions, hole sizes, and lengths are
available. Some local code authorities require that polytube material be a nationally recognized or certified material.
Consult code authorities that have jurisdiction and the polytube supplier to determine the appropriate polytube material
and recommend methods of suspension. Polytubing can be obtained from a supply distributor such as MVT-USA Com-
pany, 150 Elizabeth Lane, Unit 1, Genoa City, WI 53128 or from most local greenhouse supply distributors.
The total open or free area of the polytube is important. Polytube suppliers have a great deal of flexibility in placement and
sizing of holes. Too small of a free area will cause overheating and damage to the polytube. Excessive open area may not
permit the tube to inflate. See the table below for a guide in hole size and location. Spacing and hole size may be
varied, but free area must be approximately as shown for your heater size.
8. Installation Checks (cont’d)
Conversion Table
(Diameter of the Hole to
Square Inch Area of a Hole)
Multiply the quantity
of holes times the
area of each hole to
determine the “free
area”.
*Required direct drive
blower speed.
Size
Speed
75
Low
100
Low
125
Medium
Equals
Area of the
Hole
(inches)
(square inches)
2-1/2
4.91
2-1/4
3.98
2
3.14
1-7/8
2.76
1-1/2
1.76
1
0.785
Hole
Diameter
Suggested Hole Sizes and Locations
Length of Polytube
50 Ft 75 Ft 100 Ft 125 Ft 150 Ft
Quantity 75 pairs 75 pairs 75 pairs 75 pairs 75 pairs
75*
960
18
115
Diameter
1"
1"
1"
1"
1"
Spacing
8"
12"
16"
20"
24"
Quantity 48 pairs 48 pairs 48 pairs 48 pairs 48 pairs
100*
1345
18
160
Diameter 1-1/2" 1-1/2"
1-1/2"
1-1/2"
1-1/2"
Spacing 12-1/2" 18-3/4"
25"
31-1/4" 37-1/2"
Quantity 50 pairs 50 pairs 50 pairs 50 pairs 50 pairs
125*
1540
18
185
Diameter 1-1/2" 1-1/2"
1-1/2"
1-1/2"
1-1/2"
Spacing
12"
18"
24"
30"
36"
Quantity 40 pairs 40 pairs 40 pairs 40 pairs 45 pairs
150
1920
24
230
Diameter
2"
2"
2"
2"
1-7/8"
Spacing
15"
22-1/2"
30"
37-1/2"
40"
Quantity 50 pairs 50 pairs 80 pairs 80 pairs 80 pairs
175
2240
24
270
Diameter 1-7/8" 1-7/8"
1-1/2"
1-1/2"
1-1/2"
Spacing
12"
18"
15"
18-3/4" 22-1/2"
Quantity 50 pairs 50 pairs 50 pairs 50 pairs 50 pairs
200
2560
24
300
Diameter
2"
2"
2"
2"
2"
Spacing
12"
18"
24"
30"
36"
Quantity 42 pairs 42 pairs 42 pairs 42 pairs 42 pairs
225
2880
24
340
Diameter 2-1/4" 2-1/4"
2-1/4"
2-1/4"
2-1/4"
Spacing
14"
21"
28"
35"
42"
Quantity 50 pairs 50 pairs 50 pairs 60 pairs 60 pairs
250
3200
24
380
Diameter 2-1/4" 2-1/4"
2-1/4"
2"
2"
Spacing
12"
18"
24"
25"
30"
Quantity 60 pairs 60 pairs 75 pairs 75 pairs 75 pairs
300
3840
24
460
Diameter 2-1/4" 2-1/4"
2"
2"
2"
Spacing
10"
15"
16"
20"
24"
Quantity 50 pairs 50 pairs 50 pairs 50 pairs 50 pairs
350
4480
24
540
Diameter 2-1/2" 2-1/2"
2-1/2"
2-1/2"
2-1/2"
Spacing
12"
18"
24"
30"
36"
Quantity 60 pairs 60 pairs 75 pairs 75 pairs 75 pairs
400
5120
24
600
Diameter 2-1/2" 2-1/2"
2-1/4"
2-1/4"
2-1/4"
Spacing
10"
15"
16"
20"
24"
Holes
Size
CFM at
60°F Temp
Rise
Polytube
Diameter
(inches)
Approximate Free
Area (square
inches)