Empire Comfort Systems VFHS-20/10T-4 - Manual (Page 8)

Page 8 16717-2-0605
GAS SUPPLY
Check all local codes for requirements, especially for the size and
type of gas supply line required.
Recommended Gas Pipe Diameter
Pipe Length Schedule 40 Pipe Tubing, Type L
(Feet) Inside Diameter Outside Diameter
Nat. L.P. Nat. L.P.
0-10 1/2" 3/8" 1/2" 3/8"
12.7mm 9.5mm 12.7mm 9.5mm
10-40 1/2" 1/2" 5/8" 1/2"
12.7mm 12.7mm 15.9mm 12.7mm
40-100 1/2" 1/2" 3/4" 1/2"
12.7mm 12.7mm 19mm 12.7mm
100-150 3/4" 1/2" 7/8" 3/4"
19m 12.7mm 22.2mm 19mm
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.
Installing a New Main Gas Cock
Each appliance should have its own manual gas cock.
In the state of Massachusetts the gas cock must be a T handle
type.
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 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.
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" (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 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).
Figure 3
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
VFHS-20R Natural gas will have a manifold pressure of
approximately 3.5" w.c. (.871kPa) for maximum input or 1.7"
w.c. (.423kPa) for minimum input at the pressure regulator outlet
with the inlet pressure to the pressure regulator from a minimum
of 4.5" w.c. (1.120kPa) for the purpose of input adjustment to
a maximum of 10.5" w.c. (2.614kPa). VFHS-20/10T 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. (1.74kPa)
for the purpose of input adjustment to a maximum of 10.5" w.c.
(2.615kPa). VFHS-20R Propane gas will have a manifold pressure
approximately 10.0"w.c. (2.49kPa) for maximum input or 6.3"w.
c. (1.568kPa) for minimum input 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). VFHS-20/10T Propane gas
will have a manifold pressure approximately 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).