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Gas Piping
22
Installing the New Water Heater (cont’d)
WARNING
Make sure the gas supplied is the same type listed on the
model rating plate. The inlet gas pressure must not exceed
10.5 in. water column (2.6kPa) for natural gas or 13 in.
water column (3.2kPa) for propane (L.P.) gas. The mini-
mum inlet gas pressure listed on the rating plate is for the
purpose of input adjustment.
WARNING
If the gas control valve is subjected to pressure exceeding
1
/
2
pound per square inch (3.5kPa), the damage to the gas con-
trol valve could result in a fire or explosion from leaking gas.
WARNING
If the main gas line shutoff serving all gas appliances is
used, also turn “OFF” the gas at each appliance. Leave all
gas appliances turned “OFF” until the water heater instal-
lation is complete.
POSITION FIRESTOP
SUPPORT LATERALS
MIN. EVERY 3
1
/
2
’
45° ELBOW
MAINTAIN LISTED
CLEARANCE
SEAL AROUND
FLASHING
VENT CAP MUST
BE POSITIONED
DOWNWARD
SCREEN
18″ MIN.
EACH VENT
MAINTAIN LISTED
CLEARANCE
SUPPORT IF NECESSARY
MAINTAIN LISTED
CLEARANCE
EXHAUST VERTICAL
VENT
CERTIFIED
WATER HEATER
TOTAL VERTICAL
AND HORIZONTAL
RUNS - SEE ITEM 6.
45˚ VENT CAP
90˚ STREET
ELL
6. The total vertical and horizontal vent run cannot
exceed the maximum length with the number of 90˚
elbows as specified in the tables below and in the next
column. If more elbows are required the venting dis-
tance must be reduced 5 feet for every 90˚ elbow.
VENTING THROUGH A ROOF (cont’d)
ALL 40 and 50 GALLON 40,000 BTU/HR MODELS ONLY
3
″″
DIA. VENT NUMBER OF
MAX. LENGTH (FT.) 90° ELBOWS*
115 1
110 2
105 3
100 4
95 5
90 6
ALL 40 and 50 GALLON 40,000 BTU/HR MODELS —
OPTIONAL 2
″″
VENT PIPING
2
″″
DIA. VENT NUMBER OF
MAX. LENGTH (FT.) 90° ELBOWS*
50 1
45 2
40 3
35 4
30 5
25 6
*NOTE: Two 45° elbows are equivalent to one 90° elbow.
One 90° elbow equals 5 feet of equivalent vent length.
75 GALLON 70,000 and 75,000 BTU/HR, 50 GALLON
52,500, 55,000 and 62,500 BTU/HR and 40 GALLON
50,000 BTU/HR MODELS ONLY
3
″″
DIA. VENT NUMBER OF
MAX. LENGTH (FT.) 90° ELBOWS*
70 1
65 2
60 3
55 4
50 5
45 6
75 GALLON 70,000 and 75,000 BTU/HR, 50 GALLON 52,500,
55,000 and 62,500 BTU/HR and 40 GALLON 50,000 BTU/HR
MODELS ONLY – OPTIONAL 4″ VENT PIPING
4
″″
DIA. VENT NUMBER OF
MAX. LENGTH (FT.) 90° ELBOWS*
110 1
105 2
100 3
95 4
90 5
85 6