Counterflow Installations; Gas Piping Checks; P G T P; Ropane As Anks And Circulating Air And Filters - Goodman VC8 Installation Instructions Manual

C I
OUNTERFLOW NSTALLATIONS
When the gas piping enters through the left side of the furnace,
the installer must supply a straight pipe and a 90 degree elbow
to reach the exterior of the furnace.
A ground joint union, drip leg and manual shutoff valve must
also be supplied by the installer. In most cases, the installer
may also need to supply a transition piece from ½" to another
pipe size. When the gas piping enters through the right side of
the furnace, the installer must supply the following fittings (start-
ing at the gas valve):
• Close Nipple
• 90 Degree Elbow
• Straight Pipe to Reach Exterior of Furnace.
G P C
AS IPING HECKS
Before placing unit in operation, leak test the unit and gas con-
nections.
T
O AVOID THE POSSIBILITY OF
OR OPEN FLAME TO TEST FOR
Check for leaks using an approved chloride-free soap and wa-
ter solution, an electronic combustible gas detector, or other
approved testing methods.
NOTE: Never exceed specified pressures for testing. Higher
pressure may damage the gas valve and cause subsequent
overfiring, resulting in heat exchanger failure.
Disconnect this unit and shutoff valve from the gas supply pip-
ing system before pressure testing the supply piping system
with pressures in excess of 1/2 psig (3.48 kPa).
This unit must be isolated from the gas supply system by clos-
ing its manual shutoff valve before pressure testing of gas sup-
ply piping system with test pressures equal to or less than 1/2
psig (3.48 kPa).
P G T
ROPANE AS ANKS AND
I
F THE GAS FURNACE IS INSTALLED
,
AREA OR CONFINED SPACE IT
CONTACT A PROPANE SUPPLIER
DEVICE IN CASE OF A GAS LEAK
S
•
INCE PROPANE GAS IS HEAVIER
SETTLE IN ANY LOW AREAS
P
•
ROPANE GAS ODORANT MAY
EXCEPT WITH A WARNING DEVICE
WARNING
,
EXPLOSION OR FIRE NEVER USE
.
LEAKS
P
IPING
WARNING
,
IN A BASEMENT AN EXCAVATED
IS STRONGLY RECOMMENDED
TO INSTALL A GAS DETECTING
.
,
THAN AIR ANY LEAKING GAS
.
OR CONFINED SPACES
,
FADE MAKING THE GAS UNDETECTABLE
.
A gas detecting warning system is the only reliable way to
detect a propane gas leak. Rust can reduce the level of odorant
in propane gas. Do not rely on your sense of smell. Contact a
local propane gas supplier about installing a gas detecting
warning system. If the presence of gas is suspected, follow
the instructions on Page 3 of this manual.
All propane gas equipment must conform to the safety stan-
dards of the National Board of Fire Underwriters, NBFU Manual
58.
For satisfactory operation, propane gas pressure must be 10
inch WC at the furnace manifold with all gas appliances in
operation. Maintaining proper gas pressure depends on three
main factors:
1. Vaporization rate, depending on temperature of the liquid,
and "wetted surface" area of the container or containers.
2. Proper pressure regulation. (Two-stage regulation is
recommended for both cost and efficiency).
3. Pressure drop in lines between regulators, and between
second stage regulator and the appliance. Pipe size will
depend on length of pipe run and total load of all
A MATCH
appliances.
Complete information regarding tank sizing for vaporization, rec-
ommended regulator settings, and pipe sizing is available from
most regulator manufacturers and propane gas suppliers.
Since propane gas will quickly dissolve white lead and most
standard commercial compounds, special pipe dope must be
used. Shellac-based compounds resistant to the actions of
liquefied petroleum gases such as Gasolac
®
Clyde's or John Crane
Refer to the following illustration for typical propane gas instal-
lations and piping.
TO
WARNING
CAN
21
®
are satisfactory.
5 to 15 PSIG
First Stage
(20 PSIG Max.)
Regulator
200 PSIG
Maximum
Propane Gas Installation (Typ.)
® ®
, Stalactic ,
Continuous
11" W.C.
Second Stage
Regulator