Lochinvar ARMOR 151 - Manual (Page 46)

Installation & Operation Manual
46
Nominal
Iron Pipe
Size (Inches)
Single Unit
Natural Gas Pipe Capacity Chart
Length of Pipe in Straight Feet for 1/2 PSI
10 20 30 40 50 60 70 80 90 100 125 150 175 200
1/2 175 120 97 82 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
3/4 369 256 205 174 155 141 128 121 113 106 95 86 79 74
1 697 477 384 328 292 267 246 236 210 200 179 164 149 138
1-1/4 1400 974 789 677 595 543 502 472 441 410 369 333 308 287
1-1/2 2150 1500 1210 1020 923 830 769 707 666 636 564 513 472 441
2 4100 2820 2260 1950 1720 1560 1440 1330 1250 1180 1100 974 871 820
2-1/2 6460 4460 3610 3100 2720 2460 2310 2100 2000 1900 1700 1540 1400 1300
3 11200 7900 6400 5400 4870 4410 4000 3800 3540 3330 3000 2720 2500 2340
4 23500 16100 13100 11100 10000 9000 8300 7690 7380 6870 6150 5640 5130 4720
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 13 thru 15). 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.
Table 7A Natural Gas Pipe Size Chart
The gas piping must be sized for the proper flow and length of
pipe, to avoid excessive pressure drop. Both the gas meter and
the gas regulator must be properly sized for the total gas load.
If you experience a pressure drop greater than 1 inch w.c., the
meter, regulator, or gas line is undersized or in need of service.
Perform the steps below when checking inlet gas supply:
1. Turn the main power switch to the “OFF” position.
2. Shut off gas supply at the manual gas valve in the gas
piping to the appliance.
3. On Models 151 - 501 loosen the set screw one (1) full
turn from inside the pressure tap on top of the gas valve.
On Models 601 - 801 remove the 1/8" (3 mm) pipe plug
on the inlet flange to the valve and install a suitable 1/8"
(3 mm) fitting (field supplied) for the manometer tubing.
Place the tubing of the manometer over the tap once the
set screw is loosened or the 1/8" (3 mm) fitting is installed
(depending on model) as shown in FIG.’s 7-6 thru 7-9 on
page 47.
4. Slowly turn on the gas supply at the field installed
manual gas valve.
ƽ WARNING
5. Turn the power switch to the “ON” position.
6. Adjust the temperature set point on the control panel of
the SMART SYSTEM control module to call for heat.
7. Observe the gas supply pressure as the burner fires at
100% of rated input. Percent of burner input will be
displayed on the control panel.
8. Ensure inlet pressure is within specified range.
Minimum and maximum gas supply pressures are
specified in this section of the manual.
9. If gas supply pressure is within normal range and no
adjustments are needed, proceed on to Step 11.
10. If the gas pressure is out of range, contact the gas utility,
gas supplier, qualified installer or service agency to
determine the necessary steps to provide proper gas
pressure to the control.
11. Turn the power switch to the “OFF” position.
12. Shut off the gas supply at the manual gas valve in the gas
piping to the appliance.
13. Remove the manometer from the pressure tap on top of
the gas valve. On Models 151 - 501 re-tighten the set
screw inside the pressure tap. On Models 601 - 801
remove the 1/8" (3 mm) field supplied fitting and
reinstall the pipe plug removed in Step 3.
Check inlet gas supply
NOTICE
CSA or UL listed flexible gas connections are
acceptable, but you must exercise caution to
ensure that the line has adequate capacity
to allow your water heater to fire at full
rate. Consult with local codes for proper
installation or service procedures.
DO NOT adjust or attempt to measure
gas valve outlet pressure. The gas valve is
factory-set for the correct outlet pressure.
This setting is suitable for natural gas and
propane, requiring no field adjustment.
Attempting to alter or measure the gas valve
outlet pressure could result in damage to
the valve, causing potential severe personal
injury, death, or substantial property damage.
ƽ WARNING
7
Gas connections
ƽ WARNING
When re-tightening the set screw, be sure to
tighten securely to prevent gas leaks.
Do not check for gas leaks with an open
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.
14. Turn on the gas supply at the manual gas valve.
15. Turn the power switch to the “ON” position.
16. Adjust the temperature set point on the control panel of
the SMART SYSTEM control module to the desired
water temperature so the appliance will call for heat.