Gas supply – Empire Comfort Systems SR-18-3 User Manual

Page 7

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16942-3-0506

Page 7

GAS SUPPLY

The gas line can be routed either through the floor or wall. The gas

line opening should be made at this time. Location of the opening

will be determined by the position of floor joists and the valve and

union used for servicing.
Gas Supply

Check all local codes for requirements, especially for the size and

type of gas supply line required.

Note: Never use plastic pipe. Check to confirm whether your local

codes allow copper tubing or galvanized.
Note: Since some municipalities have additional local codes, it is

always best to consult your local authority and installation code.

GAS INLET
IN BOTTOM
OF HEATER

VIEW FROM TOP OF HEATER

1 11/16” (43mm)

TO WALL

3 9/16”

(90mm)

WALL

Dimensions Apply to SR-6, SR-10, SR-18

Figure 1

Installing a New Main Gas Cock

Each appliance should have its own manual gas cock.
A manual main gas cock should be located in the vicinity of the

unit. Where none exists, or where its size or location is not ad-

equate, contact your local authorized installer for installation or

relocation.
Compounds used on threaded joints of gas piping shall be resistant

to the action of liquefied petroleum gases. The gas lines must be

checked for leaks by the installer. This should be done with a soap

solution watching for bubbles on all exposed connections, and if

unexposed, a pressure test should be made.
Never use an exposed flame to check for leaks. Appliance must be

disconnected from piping at inlet of control valve and pipe capped

or plugged for pressure test. Never pressure test with appliance

connected; control valve will sustain damage!

A gas valve and ground joint union should be installed in the gas

line upstream of the gas control to aid in servicing. It is required

by the National Fuel Gas Code that a drip line be installed near

the gas inlet. This should consist of a vertical length of pipe tee

connected into the gas line that is capped on the bottom in which

condensation and foreign particles may collect.

Figure 2

Method of Installing a Tee Fitting Sediment Trap (Figure 2)

The use of the following gas connectors is recommended:

— ANS Z21.24 Appliance Connectors of Corrugated Metal Tub-

ing and Fittings

— ANS Z21.45 Assembled Flexible Appliance Connectors of

Other Than All-Metal Construction

The above connectors may be used if acceptable by the authority

having jurisdiction.
Pressure Testing of the Gas Supply System

1. To check the inlet pressure to the gas valve, a 1/8" (3mm) N.P.T.

plugged tapping, accessible for test gauge connection, must be

placed immediately upstream of the gas supply connection to

the appliance.

2. The appliance and its appliance main gas valve must be discon-

nected from the gas supply piping system during any pressure

testing of that system at test pressures in excess of 1/2 psig (3.5

kPa).

3. The appliance must be isolated from the gas supply piping sys-

tem by closing its equipment shutoff valve during any pressure

testing of the gas supply piping system at test pressures equal

to or less than 1/2 psig (3.5 kPa).

Attention! If one of the above procedures results in pressures in

excess of 1/2 psig (14" w.c.) (3.5 kPa) on the appliance gas valve,

it will result in a hazardous condition.
Checking Manifold Pressure

Natural gas will have a manifold pressure of approximately 6.0"

w.c. (1.49kPa) at the pressure regulator outlet with the inlet pressure

to the pressure regulator from a minimum of 7.0" w.c. (1.743kPa)

for the purpose of input adjustment to a maximum of 10.5" w.c.

(2.615kPa). Propane/LP gas will have a manifold pressure ap-

proximately 10.0" w.c. (2.49kPa) at the pressure regulator outlet

with the inlet pressure to the pressure regulator from a minimum

of 11.0" w.c. (2.739kPa) for the purpose of input adjustment to a

maximum of 13.0" w.c. (3.237kPa).
A test gage connection is located downstream of the gas appliance

pressure regulator for measuring gas pressure. The connection is a

1/8 inch (3mm) N.P.T. plugged tapping.

Recommended Gas Pipe Diameter

Pipe Length

Schedule 40 Pipe

Inside Diameter

Tubing, Type L

Outside Diameter

Nat.

L.P.

Nat.

L.P.

0-10 feet

0-3 meters

1/2”

12.7mm

3/8”

9.5mm

1/2”

12.7mm

3/8”

9.5mm

10-40 feet

4-12 meters

1/2”

12.7mm

1/2”

12.7mm

5/8”

15.9mm

1/2”

12.7mm

40-100 feet

13-30 meters

1/2”

12.7mm

1/2”

12.7mm

3/4”

19mm

1/2”

12.7mm

100-150 feet

31-46 meters

3/4”

19mm

1/2”

12.7mm

7/8”

22.2mm

3/4”

19mm

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