Natural Gas; Pipe Sizing For Natural Gas; Natural Gas Supply Pressure Requirements; Propane Gas - Lochinvar 151 - 801 Operation Manual

4
Gas connections
Do not check for gas leaks with an open
WARNING
flame – 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 flow.
Failure to apply pipe sealing compound as
WARNING
detailed in this manual can result in severe
personal injury, death, or substantial
property damage.
Outdoor Armor water heaters are typically
WARNING
shipped ready to fire 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
LP by installing an orifice or by making
a gas valve adjustment (see pages 11 and
12). In order to operate on LP gas, an
orifice 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
WARNING
piping at water heater (FIG. 4-5), 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 4-5 Inlet Pipe with Backup Wrench
IMG00297
Maximum inlet gas pressure must not
NOTICE
exceed the value specified. Minimum
value listed is for the purposes of input
adjustment.
22
Outdoor Armor Water Heater
USE BACKUP WRENCH TO
PREVENT PIPE FROM ROTATING
Installation & Operation Manual

Natural gas:

Pipe sizing for natural gas

1. Refer to Table 4A for pipe length and diameter. Based on
rated water heater input (divide by 1,000 to obtain cubic
feet per hour).
a. Table 4A is only for natural gas with specific gravity
0.60 inches, with a pressure drop through the gas
piping of 0.50 inches w.c.
b. For additional gas pipe sizing information, refer to
ANSI Z223.1 (or B149.1 for Canadian installations).

Natural gas supply pressure requirements

1. Pressure required at the gas valve inlet pressure port:
• Maximum 14 inches w.c. with no flow (lockup) or
with water heater on.
• Minimum 4 inches w.c. with gas flowing (verify during
water heater startup).
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 gas:

Outdoor Armor water heaters are typically
WARNING
shipped ready to fire 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 LP by
installing an orifice or by making a gas valve
adjustment (see pages 11 and 12). In order
to operate on LP gas, an orifice 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 flow (lockup) or with
water heater on.
• Minimum 8 inches w.c. with gas flowing (verify during
water heater startup).
Ensure that the high gas pressure regulator
WARNING
is at least 6 - 10 feet upstream of the
appliance.