Goodman AMH8 Service Instructions Manual page 32

PRODUCT DESIGN
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
11 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 liq-
uid, and "wetted surface" area of the container or con-
tainers.
2. Proper pressure regulation. (Two-stage regulation is rec-
ommended 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 appli-
ances.
Complete information regarding tank sizing for vaporiza-
tion, recommended regulator settings, and pipe sizing is
available from most regulator manufacturers and propane
gas suppliers.
Always use a pipe sealant approved for natural gas and LP
gas.
Refer to the following illustration for typical propane gas
installations and piping.
First Stage
Regulator
200 PSIG
Maximum
Typical Propane Gas Installation
I
F THE GAS FURNACE IS INSTALLED IN A BASEMENT, AN EXCAVATED
AREA OR A CONFINED SPACE, IT IS STRONGLY RECOMMENDED TO
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, ANY LEAKING GAS CAN
SETTLE IN ANY LOW AREAS OR CONFINED SPACES.
P
• ROPANE GAS ODORANT MAY FADE, MAKING THE GAS UNDETECTABLE
EXCEPT WITH A WARNING DEVICE.
32
5 to 15 PSIG
(20 PSIG Max.)
Continuous
11" W.C.
Second Stage
Regulator
WARNING
WARNING
A
N UNDETECTED GAS LEAK WILL CREATE A DANGER OF EXPLOSION
I
OR FIRE. F THE PRESENCE OF GAS IS SUSPECTED, FOLLOW THE
INSTRUCTIONS ON THE COVER OF THIS MANUAL.
SERIOUS PERSONAL INJURY OR DEATH
COULD RESULT IN
WARNING
I
F THE INFORMATION IN THESE INSTRUCTIONS IS NOT FOLLOWED EXACTLY, A
FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL
INJURY OR LOSS OF LIFE.
D
– O NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND
LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE.
WHAT TO DO IF YOU SMELL GAS
–
D
• O NOT TRY TO LIGHT ANY APPLIANCE.
D
• O NOT TOUCH ANY ELECTRICAL SWITCH; DO NOT USE ANY
PHONE IN YOUR BUILDING.
I
• MMEDIATELY CALL YOUR GAS SUPPLIER FROM A NEIGHBOR'S
F
PHONE. OLLOW THE GAS SUPPLIER'S INSTRUCTIONS.
I
• F YOU CANNOT REACH YOUR GAS SUPPLIER, CALL THE FIRE
DEPARTMENT.
I
– NSTALLATION AND SERVICE MUST BE PERFORMED BY A QUALIFIED INSTALLER,
SERVICE AGENCY OR THE GAS SUPPLIER.
Sizing Between First and Second Stage Regulator*
Maximum Propane Capacities listed are based on 2 psig pressure drop at 10 psig setting.
Capacities in 1,000 BTU/hour.
Pipe or
Tubing Size, O.D. Type L
Tubing
Length
Feet
3/8" 1/2" 5/8"
10 730 1,700 3,200
20 500 1,100 220
30 400 920 2,000
40 370 850 1,700
50 330 770 1,500
60 300 700 1,300
80 260 610 1,200
100 220 540 1,000
125 200 490 900
150 190 430 830
175 170 400 780
200 160 380 730
To convert to capacities at 15 psig settings - multiply by 1.130
To convert to capacities at 5 psig settings - multiply by 0.879
F
AILURE TO DO SO
.
:
Nominal Pipe Size
Schedule 40
3/4" 7/8" 1/2" 3/4"
5,300 8,300 3,200 7,500
3,700 5,800 2,200 4,200
2,900 4,700 1,800 4,000
2,700 4,100 1,600 3,700
2,400 3,700 1,500 3,400
2,200 3,300 1,300 3,100
1,900 2,900 1,200 2,600
1,700 2,600 1,000 2,300
1,400 2,300 900 2,100
1,300 2,100 830 1,900
1,200 1,900 770 1,700
1,100 1,800 720 1,500