Rheem GHE 119-500 - Page 13

13
MINIMUM AND MAXIMUM VENT LENGTHS
Note: Vent pipe size should not be
mixed for venting these units. Use
same size pipe for all venting of
the unit.
Notice: Vent terminals need
to be mounted horizontally a
minimum of 24 inches (center to
center) horizontally apart and
a maximum of 36 inches apart
(center to center). See Figure 17
for venting multiple units.
*NOTICE: The GHE Prefix on the model numbers
above can also be "THE"
DO NOT exceed the venting distances or the
number of elbows listed in this manual.
Exceeding the maximum lengths may cause
the water heater to malfunction or cause a
lock-out condition.
4” Pipe (Factory Installed)
4”x6” Increaser
(Field Supplied)
Air Intake
Exhaust Vent
4” Pipe
(Field Supplied)
4”x6” Increaser
(Field Supplied)
4”x3” Reducer
(Field Supplied)
NOTE: The equivalent straight pipe length of a 90°,
¼ standard bend elbow and a 45°, 1/8" standard
bend elbow is 5 feet, respectively. DO NOT use
short bend elbows.
NOTE: An elbow used as an exhaust vent termina-
tion fitting must be included when determining the
total number of elbows.
Figure 8
Installation
Direct Vent
Power Vent
Direct Vent
Power Vent
Table 5: Minimum and Maximum Vent and Air Intake Pipe Lengths (6" Pipe)
Table 4: Minimum and Maximum Vent and Air Intake Pipe Lengths (4" Pipe)
50 0 240
Fuel
Type
Fuel
Type
NAT or
LP
NAT or
LP
Vent
4
()
20
GHE119-500
GHE125-500A
50 50
120
‡
120
‡
0
0 100
Model(s)
Vent
Arrangement
Minimum Equivalent Pipe Length
(per pipe run)
Maximum Equivalent Pipe Length
(per pipe run)
Air Intake
3
()
Vent
4
()
Air Intake
3
()
GHE119-500
GHE125-500A
20
50
‡
50
‡
0
Model(s)
Vent
Arrangement
Minimum Equivalent Pipe Length
(per pipe run)
Maximum Equivalent Pipe Length
(per pipe run)
Air Intake
1
()
Vent
2
()
Air Intake
1
()
Vent
2
()
20
1
Equivalent length is measured between the 4" pipe connection on the water heater and the required 90° elbow termination fitting.
2
Equivalent length is measure after the point of connection to the condensate assembly and includes the termination fitting (it used).
‡ Shown as a balanced system. Vent length may exceed air intake length if total combined length does not exceed 100 ft.
Intake length cannot exceed exhaust length.
3
Equivalent length is measured between the 4" pipe connection on the water heater and the required 90° elbow termination fitting.
4
Equivalent length is measure after the point of connection to the condensate assembly and includes the termination fitting (it used).
‡ Shown as a balanced system. Vent length may exceed air intake length if total combined length does not exceed 240 ft.
Intake length cannot exceed exhaust length.