43
2. Install 100% lockup gas pressure regulator in supply line if
inlet pressure can exceed 14 inches w.c. at any time. Adjust
lockup regulator for 14 inches w.c. maximum.
PROPANE (LP) GAS
XP water heaters are typically shipped ready to re on natural
gas. Check water heater rating plate to determine which fuel the
water heater is set for. If set to natural gas, it may be converted
to Propane (LP) by installing an orice or by making a gas
valve adjustment (see pages 13 thru 15). In order to operate on
Propane (LP) gas, an orice MUST BE installed or a gas valve
adjustment MUST BE made. Failure to comply could result in
severe personal injury, death, or substantial property damage.
PIPE SIZING FOR PROPANE GAS
1. Contact gas supplier to size pipes, tanks, and 100% lockup
gas pressure regulator.
PROPANE SUPPLY PRESSURE REQUIREMENTS
1. Adjust propane supply regulator provided by the gas supplier
for 14 inches w.c. maximum pressure.
2. Pressure required at gas valve inlet pressure port:
• Maximum 14 inches w.c. with no ow (lockup) or with
water heater on.
• Minimum 8 inches w.c. with gas owing (verify during
water heater startup).
Ensure that the high gas pressure regulator is at least 6 - 10 feet
upstream of the appliance.
Do not check for gas leaks with an open ame – use the bubble
test. Failure to use the bubble test or check for gas leaks can
cause severe personal injury, death, or substantial property
damage.
6. Use pipe sealing compound compatible with propane gases.
Apply sparingly only to male threads of the pipe joints so that
pipe dope does not block gas ow.
Failure to apply pipe sealing compound as detailed in this
manual can result in severe personal injury, death, or substantial
property damage.
XP water heaters are typically shipped ready to re on natural
gas. Check the water heater rating plate to determine which
fuel the water heater is set for. If set to natural gas, it may be
converted to Propane (LP) by installing an orice or by making a
gas valve adjustment (see pages 13 thru 15). In order to operate
on Propane (LP) gas, an orice MUST BE installed or a gas valve
adjustment MUST BE made. Failure to comply could result in
severe personal injury, death, or substantial property damage.
Use two wrenches when tightening gas piping at water heater
(Figure 65), using one wrench to prevent the water heater gas
line connection from turning. Failure to support the water heater
gas connection pipe to prevent it from turning could damage gas
line components.
Figure 65. Inlet Pipe with Backup Wrench
NOTE: Maximum inlet gas pressure must not exceed the value
specied. Minimum value listed is for the purposes of input
adjustment.
NATURAL GAS
PIPE SIZING FOR NATURAL GAS
1. Refer to Table 23 for pipe length and diameter. Based on
rated water heater input (divide by 1,000 to obtain cubic feet
per hour).
a. Table 23 is only for natural gas with specic gravity 0.60
inches, with a pressure drop through the gas piping of 0.30
inches w.c.
b. For additional gas pipe sizing information, refer to ANSI
Z223.1.
NATURAL GAS SUPPLY PRESSURE REQUIREMENTS
1. Pressure required at the gas valve inlet pressure port:
• Maximum 14 inches w.c. with no ow (lockup) or with
water heater on.
• Minimum 4 inches w.c. with gas owing (verify during
water heater startup).
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