Ropane As Anks And Iping; Piping - Goodman GMH95 Installation Instructions Manual

E
DGES OF SHEET METAL HOLES MAY BE SHARP
PRECAUTION WHEN REMOVING HOLE PLUGS
D /S I P
IRECT TANDARD NLET IPING
When gas piping enters directly to the gas valve through the stan-
dard inlet hole, the installer must supply straight pipe with a ground
joint union to reach the exterior of the furnace. The rigid pipe must
be long enough to reach the outside of the cabinet to seal the
grommet cabinet penetration. A semi-rigid connector to the gas
piping can be used outside the cabinet per local codes.
I /A I
NDIRECT LTERNATE NLET
When gas piping enters indirectly to the gas valve through the
alternate gas inlet hole, the following 1/2 inch pipe fittings (starting
from the gas valve) to reach the outside of the cabinet must be
supplied:
•
(1) 90 degree street elbow
•
(1) 2 1/2" pipe nipple
•
(1) 90 degree elbow
•
Straight Pipe
•
The straight pipe must be long enough to reach the outside
of the cabinet so as to seal the grommet cabinet penetration
and to install the ground joint union outside the cabinet. A
semi-rigid connector to the gas piping can be used outside
the cabinet per local codes.
G P C
AS IPING HECKS
Before placing unit in operation, leak test the unit and gas connec-
tions.
T
O AVOID THE POSSIBILITY OF EXPLOSION OR FIRE
MATCH OR OPEN FLAME TO TEST FOR LEAKS
Check for leaks using an approved chloride-free soap and water
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 piping
system before pressure testing the supply piping system with pres-
sures in excess of 1/2 psig (3.48 kPa).
Isolate this unit from the gas supply piping system by closing its
external manual gas shutoff valve before pressure testing supply
piping system with test pressures equal to or less than 1/2 psig
(3.48 kPa).
WARNING
. U
SE GLOVES AS A
.
P
IPING
WARNING
,
NEVER USE A
.
P G T
ROPANE AS ANKS AND
I
F THE GAS FURNACE IS INSTALLED IN A BASEMENT
AREA OR A CONFINED SPACE
CONTACT A PROPANE SUPPLIER TO INSTALL A GAS DETECTING
WARNING DEVICE IN CASE OF A GAS LEAK
• S
INCE PROPANE GAS IS HEAVIER THAN AIR
SETTLE IN ANY LOW AREAS OR CONFINED SPACES
• P
ROPANE GAS ODORANT MAY FADE
U
NDETECTABLE EXCEPT FOR WITH A WARNING DEVICE
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
4 of this manual.
All propane gas equipment must conform to the safety standards
of the National Board of Fire Underwriters, NBFU Manual 58.
For satisfactory operation, propane gas pressure must be 11 inch
w.c. 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 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 stan-
dard commercial compounds, special pipe dope must be used.
Shellac-based compounds resistant to the actions of liquefied
petroleum gases such as Gasolac
Crane ® are satisfactory.
Refer to the following illustration for typical propane gas installa-
tions.
First Stage
Regulator
Propane Gas Installation (Typ.)
25
P
IPING
WARNING
,
AN EXCAVATED
,
IT IS STRONGLY RECOMMENDED TO
.
,
ANY LEAKING AS CAN
.
,
MAKING THE GAS
® ®
, Stalactic , Clyde's
5 to 15 PSIG
(20 PSIG Max.)
Continuous
11" W.C.
200 PSIG
Second Stage
Maximum
Regulator
.
®
or John