Empire Comfort Systems VFSR-24-3 - Manual (Page 13)

26333-3-1210 Page 13
Check all local codes for requirements, especially for the size
and type of gas supply line required.
Notice : Never use plastic pipe. Check to confirm whether
your local codes allow copper tubing or galvanized.
Notice
: Since some municipalities have additional local
codes, it is always best to consult your local authority and
installation code.
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
adequate, contact your local authorized installer for instal-
lation 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. Appli-
ance 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 11
The use of the following gas connectors is recommended:
— ANS Z21.24 Appliance Connectors of Corrugated Metal
Tubing 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. The state of Massachusetts
requires that a flexible appliance connector cannot exceed
three feet in length.
Pressure Testing of the Gas Supply System
1. To check the inlet pressure to the gas valve, a 1/8"
(3.175mm) 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 individual shutoff valve must be
disconnected 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 system by closing its individual manual 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 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.
GAS SuPPLy
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