Installation Guide

34
Installation Practices
• 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 regula-
tor 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.
• Where a gas line pres-
sure regulator is used in
a system with a source
pressure in excess of 2
PSI to serve appliances
rated for 1/2 PSI or less,
a regulator with an inte-
grated over-pressure
protection device (OPD) must be used. The regulator with OPD must be assembled
and listed by the regulator manufacturer in accordance with ANSI Z21.80, Stan-
dard for Line Pressure Regulators.
Note: The regulator models specied above are provided for reference only. They are not
distributed, warranted, or supported by Valencia Pipe Company.
Vent Limiters and Vent Lines
Regulators must be equipped with a manufacturer-supplied vent limiting device, or be capa-
ble of being vented outdoors. When installed indoors, the vent-limiting device is to be used.
When a vent-limiter is used, the regulator must be mounted in an upright position for proper
function. For outdoor venting, the vent line must be at least the same size as the regulator
vent connection and not exceed a length of 30 feet. The vent must be designed to prevent
entry of water or other foreign materials that could clog the line. DO NOT vent to an appliance
ue, building exhaust system, or pilot light.
If installing the regulator outdoors, remove the vent limiter and mount the regulator with the
vent outlet pointing toward the ground to prevent water from entering. If the manufacturer
provides a cap for outdoor installations, this can be used and the regulator can be mounted
right side up.
Gas line regulators do not vent gas under normal operating conditions. A regulator that is
venting gas should be replaced immediately.
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)