As Iping Hecks; Piping - Goodman *MH8 Installation Instructions Manual

the installer must supply the following fittings (starting at the gas
valve):
• 90 Degree Elbow
• Close Nipple
• 90 Degree Elbow
• Straight Pipe to Reach Exterior of Furnace.
G G G G G P P P P P C C C C C
AS AS AS AS AS IPING IPING IPING IPING IPING HECKS HECKS HECKS HECKS HECKS
Before placing unit in operation, leak test the unit and gas connec-
tions.
T
O AVOID THE POSSIBILITY OF
OR OPEN FLAME TO TEST FOR
Check for leaks using an approved chloride-free soap and water
solution, an electronic combustible gas detector, or other approved
testing methods.
NOTE: NOTE:
NOTE: Never exceed specified pressures for testing. Higher pressure NOTE: NOTE:
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).
This unit must be isolated from the gas supply system by closing its
manual shutoff valve before pressure testing of gas supply piping
system with test pressures equal to or less than 1/2 psig (3.48 kPa).
P P P P P G G G G G T T T T T
ROPANE ROPANE ROPANE ROPANE ROPANE AS AS AS AS AS ANKS ANKS ANKS ANKS AND ANKS AND AND AND 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 OR
P
•
ROPANE GAS ODORANT MAY
EXCEPT 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 3 of
this manual.
WARNING
,
EXPLOSION OR FIRE NEVER USE
.
LEAKS
P P P P P
IPING IPING IPING IPING IPING
WARNING
,
IN A BASEMENT AN EXCAVATED
IS STRONGLY RECOMMENDED TO
TO INSTALL A GAS DETECTING
.
,
THAN AIR ANY LEAKING GAS
.
CONFINED SPACES
,
FADE MAKING THE GAS UNDETECTABLE
.
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 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 appliances.
A MATCH
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 pe-
troleum gases such as Gasolac
are satisfactory.
Refer to the following illustration for typical propane gas installa-
tions and piping.
First Stage
Regulator
P P P P P G G G G G
ROPANE ROPANE AS AS
ROPANE ROPANE ROPANE AS AS AS
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
Length,
WARNING
3/8"
Feet
10 730
CAN
20 500
30 400
40 370
50 330
60 300
80 260
100 220
125 200
150 190
175 170
200 160
19
C C C C C A A A A A
I R I R I RC U L I R I R C U LA A A A A T I N G C U L C U L C U L T I N G T I N G T I N G T I N G I R I R I R I R A N D I R
® , Stalactic ®
5 to 15 PSIG
(20 PSIG Max.)
200 PSIG
Second Stage
Maximum
Regulator
Propane Gas Installation (Typ.)
P P P P P C C C C C
IPING IPING HARTS HARTS
IPING IPING IPING HARTS HARTS HARTS
Tubing Size, O.D. Type L
1/2" 5/8" 3/4"
1,700 3,200 5,300
1,100 2,200 3,700
920 2,000 2,900
850 1,700 2,700
770 1,500 2,400
700 1,300 2,200
610 1,200 1,900
540 1,000 1,700
490 900 1,400
430 830 1,300
400 780 1,200
380 730 1,100
F F F F F
A N D A N D A N D A N D I L I L I L I LT E R S I L T E R S T E R S T E R S T E R S
, Clyde's ® or John Crane ®
Continuous
11" W.C.
Nominal Pipe Size
Schedule 40
7/8" 1/2" 3/4"
8,300 3,200 7,500
5,800 2,200 4,200
4,700 1,800 4,000
4,100 1,600 3,700
3,700 1,500 3,400
3,300 1,300 310
2,900 1,200 2,600
2,600 1,000 2,300
2,300 900 2,100
2,100 830 1,900
1,900 770 1,700
1,800 720 1,500