Goodman Mfg CPG SERIES User Manual
Page 11
11
The rating plate is stamped with the model number, type of
gas and gas input rating. Make sure the unit is equipped to
operate on the type of gas available. The gas line installation
must comply with local codes, or in the absence of local codes,
with the latest edition of the National Fuel Gas Code NFPA
54/ANSI Z223.1.
Natural Gas Connection
Length of
Pipe in Feet
1/2
3/4
1
1 1/4
1 1/2
10
132
278
520
1050
1600
20
92
190
350
730
1100
30
73
152
285
590
980
40
63
130
245
500
760
50
56
115
215
440
670
60
50
105
195
400
610
70
46
96
180
370
560
80
43
90
170
350
530
90
40
84
160
320
490
100
38
79
150
305
460
Pressure = .50 PSIG or less and Pressure Drop of 0.3" W.C. (Based
on 0.60 Specific Gravity Gas)
Natural Gas Capacity of Pipe
in Cubic Feet of Gas Per Hour (CFH)
Nominal Black Pipe Size (inches)
B T U H Fu rn ace In p ut
H eating Valu e o f G as (B T U /C u b ic F oo t)
C FH =
Refer to the Proper Piping Practice drawing for the general
layout at the unit. The following rules apply:
1. Use black iron pipe and fittings for the supply piping.
The use of a flex connector and/or copper piping is
permitted as long as it is in agreement with local
codes.
2. Use pipe joint compound on male threads only. Pipe
joint compound must be resistant to the action of the
fuel used.
3. Use ground joint unions.
4. Install a drip leg to trap dirt and moisture before it can
enter the gas valve. The drip leg must be a minimum
of three inches long.
5. Use two pipe wrenches when making connection to
the gas valve to keep it from turning.
6. Install a manual shut-off valve in a convenient location
(within six feet of unit) between the meter and the
unit.
7. Tighten all joints securely.
8. The unit must be connected to the building piping by
one of the following methods:
•
Rigid metallic pipe and fittings
•
Semirigid metallic tubing and metallic fittings
(Aluminum alloy tubing must not be used in exterior
locations)
•
Listed gas appliance connectors used in accordance
with the terms of their listing that are completely in
the same room as the equipment
•
In the prior two methods above the connector or
tubing must be protected from physical and thermal
damage. Aluminum alloy tubing and connectors must
be coated to protect against external corrosion when
in contact with masonry, plaster or insulation or are
subject to repeated wettings by liquids (water - not
rain water, detergents or sewage).
PROVIDE CLEARANCE
FOR REMOVAL OF
ACCESS PANELS
MANUAL
SHUTOFF VALVE
DRIP LEG
DOOR
GROUND JOINT
UNION
PROPER PIPING PRACTICE
NOTE: The unit gas supply entrance is factory sealed with
plugs. Keep plugs in place until gas supply is ready to be
installed. Once ready, replace the plugs with the supplied
grommets and install gas supply line.
G
AS
P
IPING
C
HECKS
T
O
PREVENT
PROPERTY
DAMAGE
OR
PERSONAL
INJURY
DUE
TO
FIRE
,
THE
FOLLOWING
INSTRUCTIONS
MUST
BE
PERFORMED
REGARDING
GAS
CONNECTIONS
AND
PRESSURE
TESTING
:
• T
HE
UNIT
AND
ITS
GAS
CONNECTIONS
MUST
BE
LEAK
TESTED
BEFORE
PLACING
IN
OPERATION
. B
ECAUSE
OF
THE
DANGER
OF
EXPLOSION
OR
FIRE
,
NEVER
USE
A
MATCH
OR
OPEN
FLAME
TO
TEST
FOR
LEAKS
. N
EVER
EXCEED
SPECIFIED
PRESSURES
FOR
TESTING
.
H
IGHER
PRESSURE
MAY
DAMAGE
GAS
VALVE
AND
CAUSE
OVERFIRING
WHICH
MAY
RESULT
IN
PREMATURE
HEAT
EXCHANGE
FAILURE
.
• T
HIS
UNIT
AND
ITS
SHUT
‐
OFF
VALVE
MUST
BE
DISCONNECTED
FROM
THE
GAS
SUPPLY
DURING
ANY
PRESSURE
TESTING
OF
THAT
SYSTEM
AT
TEST
PRESSURES
IN
EXCESS
OF
1/2 PSIG (3.48
K
P
A
).
• T
HIS
UNIT
MUST
BE
ISOLATED
FROM
THE
GAS
SUPPLY
SYSTEM
BY
CLOSING
ITS
MANUAL
SHUT
‐
OFF
VALVE
DURING
ANY
PRESSURE
TESTING
OF
THE
GAS
SUPPLY
PIPING
SYSTEM
AT
TEST
PRESSURES
EQUAL
TO
OR
LESS
THAN
1/2 PSIG (3.48
K
P
A
).
CAUTION
T
O
AVOID
PROPERTY
DAMAGE
OR
PERSONAL
INJURY
,
BE
SURE
THERE
IS
IN
THE
VICINITY
DURING
AIR
BLEEDING
.
NO
OPEN
FLAME
WARNING
There will be air in the gas supply line after testing for leaks
on a new installation. Therefore, the air must be bled from
the line by loosening the ground joint union until pure gas is
expelled. Tighten union and wait for five minutes until all gas
has been dissipated in the air. Be certain there is no open
flame in the vicinity during air bleeding procedure. The unit is
placed in operation by closing the main electrical disconnect
switch for the unit.