Installation & Operation Manual
36
7
Gas connections
Failure to apply pipe sealing compound as
detailed in this manual can result in severe
personal injury, death, or substantial
property damage.
Armor water heaters are typically 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 12 and 13). 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
piping at water heater (FIG. 7-4), 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 7-4
Inlet Pipe with Backup Wrench
Natural gas:
Pipe sizing for natural gas
1.
Refer to Table 7A for pipe length and diameter. Based on
rated water heater input (divide by 1,000 to obtain cubic feet
per hour).
a.
Table 7A 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:
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).
Maximum inlet gas pressure must not exceed
the value specified. Minimum value listed is
for the purposes of input adjustment.
WARNING
WARNING
WARNING
WARNING
Armor water heaters are typically 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 12 and 13). 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.
NOTICE
WARNING
Ensure that the high gas pressure regulator
is at least 6 - 10 feet upstream of the
appliance.
