Installation Guide

HOME-FLEX CSST 35
Pressure Regulators
of gas is approved to the key valve for decorative and heat generating replaces and for gas
logs used in masonry and pre-fabricated replaces. (Figure 4.23)
DO NOT use HOME-FLEX® CSST to connect gas log lighter or gas wands for use in all-fuel
(wood burning) replaces. For gas log lighter installations in all-fuel replaces, HOME-FLEX®
must be terminated at the key valve or another location outside the replace. The nal attach-
ment to the lighter should be made using black steel pipe.
Should HOME-FLEX® need to be installed
through masonry materials in the re-
place construction, the yellow jacket
should remain intact and the HOME-FLEX®
tubing should be routed through a
nonmetallic sleeve appropriate for the
application. Sleeves are not required for
routing through ceramic liner in heat gen-
erating replaces. Spaces between the
jacket and penetration at interior and/or
exterior locations can be caulked. The jack-
et can be removed inside the rebox.
Attachment to the HOME-FLEX® system is
usually made at the replace shut-o valve,
often located in the control area beneath
the burner unit or at the side of the log set. HOME-FLEX® can be run into the lower control
area without removal of the polyethylene jacket. If the replace is vented, it is suggested
to remove the yellow jacketing inside the re box to prevent direct ame contact with the
jacket.
If installing HOME-FLEX® through sheet metal enclosures (as commonly used for dec-
orative replaces), it is recommended to leave the protective yellow jacketing in place
through the penetration. HOME-FLEX® should be secured to the building structure outside
the replace to limit motion after installation. Installations that may lead to abrasion of
HOME-FLEX®, such as vibration from a fan in the replace assembly, require a short piece
of Flexible Protective Conduit or PVC pipe to insulate the HOME-FLEX® from the enclosure.
4.7 Manifold Stations
Refer to “HOME-FLEX® Stainless Steel Manifold Installations” on page 25 for important
usage instructions on using HOME-FLEX manifolds.
In elevated pressure systems (typically installed in a parallel arrange-
ment), it is recommended to use a central manifold and regulator
station to take best advantage of regulator capacity (Figure 4.25). Stain-
less steel manifolds are available from Valencia Pipe Company or can
be assembled through the use of rigid black steel pipe and fabricated
tee manifolds. It is recommended that the station be located near the
appliance(s) with the highest load in the system to allow for shorter
runs to those appliances.
The manifold and regulator station MUST be located in an accessible
location to maintain access to the shut-o valves and regulator. The
station may be housed in a gas load center enclosure (Figure 4.24).
Optional shut-o valves can be mounted on the manifold to control
each appliance run in addition to the main line shut-o valve.
Subject to local code approval, manifolds may be concealed when used in low pressure
systems, or when the manifold is installed in a location removed from the regulator. However,
accessible locations are strongly recommended.
Figure 4.23 Routing to Masonry Fireplace
CSST through
stud walls
Sleeve (if
required)
CSST through
basement or
crawl space
Figure 4.24 Gas Load Center
Figure 4.25 Example of Manifold Station Layout
Elevated pressure from gas meter
Line shut-off approved
valve
Dirt trap pocked (per
code)
Vent Limiter
House line
regulator
Union
Manifold
Low pressure to appliances
HOME-FLEX®
Fittings
4.8 Pressure Regulators
Installation Requirements
A HOME-FLEX® gas piping system used with inlet gas pressures in excess of ½ PSI, but servic-
ing appliances rated for a maximum of ½ PSI, must contain a pounds-to-inches regulator to
limit the downstream pressure to no more than ½ PSI. Gas pressure regulators must comply
with a nationally recognized standard for pressure regulators such as ANSI Z21.80/CSA 6.22.
Regulators must also conform to the following:
• Regulators must be sized in accordance with the total appliance load (maximum
ow rate), largest single appliance ow rate, inlet pressure range at the regulator
inlet, and the desired outlet pressure. (Table 4.5 and Table 4.6)
• Regulators must be
installed in accordance
with the manufacturer’s
instructions. Ensure the
ow of gas is correct, as
indicated by the ow
markings on the regu-
lator casing.
• The regulator must be installed in a fully accessible area with an approved shut-o
valve upstream. A union can be used to allow for removal of the regulator if the
location doesn’t allow proper room for regulator servicing.
Table 4.5 Pressure Drop for Natural Gas in CFH (m
3
/hr)
Model
7" w.c.
(17 mbar)
½ PSI
(34 mbar)
¾ PSI
(52 mbar)
1 PSI
(69 mbar)
325-3 145 (4.0) 204 (5.8) 250 (7.0) 289 (8.2)
325-5A 339 (9.6) 476 (13.5) 583 (16.5) 673 (19.1)
Table 4.6 Regulator Capacity Tables in CFH (m
3
/hr) (MBTU/hr values based on LP Gas with heating value of 2520 BTU per ft
3
)
Part No. Gas Type
Max. Single
Appliance
Load
Max. Total
Load
Outlet
Pressure
Set Point
Operating Inlet Pressure
½ PSI ¾ PSI 1 PSI 1½ PSI
325-3
Natural
(0.64 sp. gr.)
140 CFH 250 CFH
8" w.c. 145 (4.1) 200 (5.7) 250 (7.1) 250 (7.1)
11" w.c. 93 (2.6) 172 (4.9) 225 (6.4) 250 (7.1)
LP
(1.53 sp. gr.)
91 CFH
(229 MBTU/hr)
163 CFH
(410 MBTU/hr)
11" w.c.
60 (1.7)
(152 MBTU/hr)
112 (3.2)
(281 MBTU/hr)
146 (4.1)
(368 MBTU/hr)
162 (4.6)
(409 MBTU/hr)
325-5A
Natural
(0.64 sp. gr.)
300 CFH 550 CFH
8" w.c. 335 (9.5) 475 (13.5) 550 (15.6) 550 (15.6)
11" w.c. 211 (6.0) 391 (11.1) 511 (14.5) 550 (15.6)
LP
(1.53 sp. gr.)
195 CFH
(483 MBTU/hr)
358 CFH
(901 MBTU/hr)
11" w.c.
286 (8.1)
(345 MBTU/hr)
254 (7.2)
(639 MBTU/hr)
332 (9.4)
(836 MBTU/hr)
357 (10.1)
(899 MBTU/hr)