2. Watts
  3. Onix Coils
Onix Coils

Watts Onix Coils Installation guide

  • Hello! I am an AI chatbot trained to assist you with the Watts Onix Coils Installation guide. I’ve already reviewed the document and can help you find the information you need or explain it in simple terms. Just ask your questions, and providing more details will help me assist you more effectively!
Fan CoilBaseboard
3131 W. Chestnut Expressway
Springfield,
MO 65802
ph: 417.864.6108
fax: 417.864.8161
web: www.wattsradiant.com
For Baseboards, Fan Coils and Manifolds
Onix Connections
HiGuard™ Industrial Cover
AlumaShield™ Oxygen Barrier
Durel™ Inner Tubing
Contour Extrusion Layer
Fluid Channel
Onix™ by WattsRadiant
PRODUCT DESCRIPTION
Onix is a polymer-rich, multi-layer,
industrial-grade radiant hose used for
hydronic heating and snowmelting
applications. It contains five
distinct structural layers. The Durel
inner tube is peroxide-cured, cross-
linked EPDM (Ethylene Propylene
Diene Monomer). This layer is
wrapped with a ductile 00 grade alu-
minum oxygen barrier, called
AlumaShield. A contour layer of Durel
(EPDM) is extruded over the
AlumaShield. Spiral reinforcing cords
of Aramid fibers are applied over the
contour layer. This reinforcing is cov-
ONIX FOR SUPPLY
AND RETURN PIPING
Watts Radiant’s Onix tubing offers a
unique solution to a common problem
associated with baseboard and fan
coil systems. Running supply and
return lines to these units can be a
challenge, especially in renovation
projects.
Onix is the only synthetic tubing in the
radiant heating industry to offer an
extended high temperature warranty
of 210°F at 12 to 25 psi working pres-
sure. This higher temperature limit
allows for more
flexibility in design and
post-installation adjustments.
In addition to the higher temperature
range, Onix offers improved resist-
ance to oxygen permeation with its 00
grade AlumaSheild oxygen barrier.
This barrier actually works at temper-
ered with the outer HiGuard cover
composed of sulfur-cured, cross-
linked EPDM.
OPERATING TEMPERATURE
AND PRESSURE
Onix has a maximum working temper-
ature of 180°F at 100 psi. Burst pres-
sure is greater than 800 psi at 70°F;
greater than 600 psi at180°F.
atures above 140°F, unlike most
EVOH barriers found on PEX piping.
Different techniques are used to con-
nect Onix to baseboard, fan coils or
manifolds. It is important to prevent
Onix from exceeding its minimum
allowable bend radius. If this radius
can not be maintained, a copper
elbow should be hard piped to the
unit prior to the installation of the Onix
Barb fitting.
HiGuard™ Industrial Cover
AlumaSheild™ Oxygen Barrier
Durel™ Inner Tubing
Fluid Channel
Contour Extrusion Layer
Aramid™ Fiber Reinforcing
Manifold
Onix
Barb
SureClamp
Onix™
Onix™ by WattsRadiant
R4"
R5"
R6"
R8"
1/2” Onix
5/8” Onix
3/4” Onix
1” Onix
Onix Elbow
Fitting
SureClamp
Onix
Onix Barb
SureClamp
Onix
CONNECTION DETAILS
1. Choose the correct Onix size for
the design flow rate (see below).
2. Choose the corresponding Onix
Barb or Elbow and clamp
(SureClamp or SelfTite).
3. Solder the Onix Barb, or Onix
Elbow, onto the baseboard, fan
coil unit, or manifold. If an elbow
is required, install this prior to
installing the barb.
4. Slide the clamp over the Onix and
then the Onix over the entire barb.
ONIX BARBS AND SURECLAMPS
ONIX SIZE (id) ONIX BARB ONIX ELBOW SURECLAMP SELFTITE CLAMP
1/2” # 086081 # 185074 # 6642123 # 663022
5/8” # 086101 # 185625 # 6642527 # 663024
3/4” # 086121 # 185075 # 6642931 # 663029
1” # 086161X N/A # 6643740 N/A
BASEBOARD - BTU/FT
(estimated maximum output)
3/4” 1” 1-1/4”
160°F 520 560 610
170°F 600 650 700
180°F 680 730 790
190°F 760 830 900
0.0001
0.001 0.01 0.10.03 1.0
3/8" Tubing
1/2" Tubing
5/8" Tubing
3/4" Tubing
40,000
30,000
20,000
10,000
9,000
8,000
7,000
6,000
5,000
4,000
3,000
2,000
1,000
900
800
700
600
500
5
4
3
2
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.09
0.08
0.07
0.06
0.05
PRESSURE DROP (Feet of Head Pressure Drop per Lineal Foot of Tubing)
1 ft/sec
2 ft/sec
3 ft/sec
7 ft/sec
1.5 ft/sec
5 ft/sec
Watts Radiant PRESSURE DROP CHART FOR Onix
Pure Water
TM
TM
1.25 ft/sec
4 ft/sec
6 ft/sec
FLOW RATE (GPM) AT 20 F T
Q
s
HEAT REQUIRED (BTU/h) FOR AREA SERVED BY ONE CIRCUIT
10
9
8
7
6
50,000
60,000
70,000
80,000
90,000
100,000
1" Tubing
FAN COILS - BTU
(estimated maximum output)
1 gpm 3 gpm 5 gpm
160°F 6500 7100 7300
170°F 7400 8000 8200
180°F 8000 8600 8950
190°F 8400 9000 9400
5a.SureClamp: tighten to 25-30
in-lbs. If a torque wrench is not
available, tighten the clamps to
snug and then one additional
quarter turn.
5b.SeftTite: open with a pair of
SqueezeTite pliers, making sure
not to over expand the clamp.
Follow additional installation instructions includ-
ed with the Onix fittings and clamps.
6"
6"
TYPICAL FLOW RATES AND PRESSURE DROPS
Support Onix
within 6” on either
side of a bend with
StrapDowns or SnapClips.
Supports need to be placed every 24-
32” when hanging Onix in a horizontal posi-
tion.
/